[PATCH v21 00/13] Delayed Attributes

[PATCH v21 00/13] Delayed Attributes

[Allison Henderson]

Hi all,

This set is a subset of a larger series parent pointers. Delayed attributes allow
attribute operations (set and remove) to be logged and committed in the same
way that other delayed operations do. This allows more complex operations (like
parent pointers) to be broken up into multiple smaller transactions. To do
this, the existing attr operations must be modified to operate as a delayed
operation.  This means that they cannot roll, commit, or finish transactions.
Instead, they return -EAGAIN to allow the calling function to handle the
transaction.  In this series, we focus on only the delayed attribute portion.
We will introduce parent pointers in a later set.

The set as a whole is a bit much to digest at once, so I usually send out the
smaller sub series to reduce reviewer burn out.  But the entire extended series
is visible through the included github links.

Updates since v20: Since this series is introducing a new log item, we need to
be setting the incompat flag for older kernels that cannot parse these new
items.  I have added two patches from Darricks dev tree that handle setting and
clearing incompat flags, and a new XFS_SB_FEAT_INCOMPAT_LOG_DELATTR flag is
added and set in patch 6.


This series can be viewed on github here:
https://github.com/allisonhenderson/xfs_work/tree/delayed_attrs_v21

As well as the extended delayed attribute and parent pointer series:
https://github.com/allisonhenderson/xfs_work/tree/delayed_attrs_v21_extended

And the test cases:
https://github.com/allisonhenderson/xfs_work/tree/pptr_xfstestsv3
In order to run the test cases, you will need have the corresponding xfsprogs
changes as well.  Which can be found here:
https://github.com/allisonhenderson/xfs_work/tree/delayed_attrs_xfsprogs_v21
https://github.com/allisonhenderson/xfs_work/tree/delayed_attrs_xfsprogs_v21_extended

To run the xfs attributes tests run:
check -g attr

To run as delayed attributes run:
export MOUNT_OPTIONS="-o delattr"
check -g attr

To run parent pointer tests:
check -g parent

I've also made the corresponding updates to the user space side as well, and ported anything
they need to seat correctly.

Questions, comment and feedback appreciated! 

Allison

Allison Collins (1):
  xfs: Add xfs_attr_set_deferred and xfs_attr_remove_deferred

Allison Henderson (12):
  xfs: Return from xfs_attr_set_iter if there are no more rmtblks to
    process
  xfs: Add state machine tracepoints
  xfs: Rename __xfs_attr_rmtval_remove
  xfs: Handle krealloc errors in xlog_recover_add_to_cont_trans
  xfs: Set up infrastructure for deferred attribute operations
  xfs: Implement attr logging and replay
  RFC xfs: Skip flip flags for delayed attrs
  xfs: Remove unused xfs_attr_*_args
  xfs: Add delayed attributes error tag
  xfs: Add delattr mount option
  xfs: Merge xfs_delattr_context into xfs_attr_item
  xfs: Add helper function xfs_attr_leaf_addname

 fs/xfs/Makefile                 |   1 +
 fs/xfs/libxfs/xfs_attr.c        | 422 ++++++++++----------
 fs/xfs/libxfs/xfs_attr.h        |  57 ++-
 fs/xfs/libxfs/xfs_attr_leaf.c   |   3 +-
 fs/xfs/libxfs/xfs_attr_remote.c |  38 +-
 fs/xfs/libxfs/xfs_attr_remote.h |   6 +-
 fs/xfs/libxfs/xfs_defer.c       |   1 +
 fs/xfs/libxfs/xfs_defer.h       |   3 +
 fs/xfs/libxfs/xfs_errortag.h    |   4 +-
 fs/xfs/libxfs/xfs_format.h      |   4 +-
 fs/xfs/libxfs/xfs_log_format.h  |  44 ++-
 fs/xfs/libxfs/xfs_log_recover.h |   2 +
 fs/xfs/scrub/common.c           |   2 +
 fs/xfs/xfs_acl.c                |   2 +
 fs/xfs/xfs_attr_item.c          | 856 ++++++++++++++++++++++++++++++++++++++++
 fs/xfs/xfs_attr_item.h          |  52 +++
 fs/xfs/xfs_attr_list.c          |   1 +
 fs/xfs/xfs_error.c              |   3 +
 fs/xfs/xfs_ioctl.c              |   2 +
 fs/xfs/xfs_ioctl32.c            |   2 +
 fs/xfs/xfs_iops.c               |   2 +
 fs/xfs/xfs_log_recover.c        |  12 +-
 fs/xfs/xfs_mount.h              |   1 +
 fs/xfs/xfs_ondisk.h             |   2 +
 fs/xfs/xfs_super.c              |   6 +-
 fs/xfs/xfs_trace.h              |  25 ++
 fs/xfs/xfs_xattr.c              |   3 +
 27 files changed, 1309 insertions(+), 247 deletions(-)
 create mode 100644 fs/xfs/xfs_attr_item.c
 create mode 100644 fs/xfs/xfs_attr_item.h

-- 
2.7.4

[PATCH v21 01/13] xfs: Return from xfs_attr_set_iter if there are no more rmtblks to process

[Allison Henderson]

During an attr rename operation, blocks are saved for later removal
as rmtblkno2. The rmtblkno is used in the case of needing to alloc
more blocks if not enough were available.  However, in the case
that neither rmtblkno or rmtblkno2 are set, we can return as soon
as xfs_attr_node_addname completes, rather than rolling the transaction
with an -EAGAIN return.  This extra loop does not hurt anything right
now, but it will be a problem later when we get into log items because
we end up with an empty log transaction.  So, add a simple check to
cut out the unneeded iteration.

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
---
 fs/xfs/libxfs/xfs_attr.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index 611dc67..5e81389 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -409,6 +409,13 @@ xfs_attr_set_iter(
 			if (error)
 				return error;
 
+			/*
+			 * If addname was successful, and we dont need to alloc
+			 * or remove anymore blks, we're done.
+			 */
+			if (!args->rmtblkno && !args->rmtblkno2)
+				return error;
+
 			dac->dela_state = XFS_DAS_FOUND_NBLK;
 		}
 		return -EAGAIN;
-- 
2.7.4

[PATCH v21 02/13] xfs: Add state machine tracepoints

[Allison Henderson]

This is a quick patch to add a new xfs_attr_*_return tracepoints.  We
use these to track when ever a new state is set or -EAGAIN is returned

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
 fs/xfs/libxfs/xfs_attr.c        | 28 ++++++++++++++++++++++++++--
 fs/xfs/libxfs/xfs_attr_remote.c |  1 +
 fs/xfs/xfs_trace.h              | 24 ++++++++++++++++++++++++
 3 files changed, 51 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index 5e81389..cb6eac1 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -335,6 +335,7 @@ xfs_attr_sf_addname(
 	 * the attr fork to leaf format and will restart with the leaf
 	 * add.
 	 */
+	trace_xfs_attr_sf_addname_return(XFS_DAS_UNINIT, args->dp);
 	dac->flags |= XFS_DAC_DEFER_FINISH;
 	return -EAGAIN;
 }
@@ -394,6 +395,8 @@ xfs_attr_set_iter(
 				 * handling code below
 				 */
 				dac->flags |= XFS_DAC_DEFER_FINISH;
+				trace_xfs_attr_set_iter_return(
+					dac->dela_state, args->dp);
 				return -EAGAIN;
 			} else if (error) {
 				return error;
@@ -418,6 +421,7 @@ xfs_attr_set_iter(
 
 			dac->dela_state = XFS_DAS_FOUND_NBLK;
 		}
+		trace_xfs_attr_set_iter_return(dac->dela_state,	args->dp);
 		return -EAGAIN;
 	case XFS_DAS_FOUND_LBLK:
 		/*
@@ -445,6 +449,8 @@ xfs_attr_set_iter(
 			error = xfs_attr_rmtval_set_blk(dac);
 			if (error)
 				return error;
+			trace_xfs_attr_set_iter_return(dac->dela_state,
+						       args->dp);
 			return -EAGAIN;
 		}
 
@@ -479,6 +485,7 @@ xfs_attr_set_iter(
 		 * series.
 		 */
 		dac->dela_state = XFS_DAS_FLIP_LFLAG;
+		trace_xfs_attr_set_iter_return(dac->dela_state, args->dp);
 		return -EAGAIN;
 	case XFS_DAS_FLIP_LFLAG:
 		/*
@@ -496,6 +503,9 @@ xfs_attr_set_iter(
 		dac->dela_state = XFS_DAS_RM_LBLK;
 		if (args->rmtblkno) {
 			error = __xfs_attr_rmtval_remove(dac);
+			if (error == -EAGAIN)
+				trace_xfs_attr_set_iter_return(
+					dac->dela_state, args->dp);
 			if (error)
 				return error;
 
@@ -549,6 +559,8 @@ xfs_attr_set_iter(
 				error = xfs_attr_rmtval_set_blk(dac);
 				if (error)
 					return error;
+				trace_xfs_attr_set_iter_return(
+					dac->dela_state, args->dp);
 				return -EAGAIN;
 			}
 
@@ -584,6 +596,7 @@ xfs_attr_set_iter(
 		 * series
 		 */
 		dac->dela_state = XFS_DAS_FLIP_NFLAG;
+		trace_xfs_attr_set_iter_return(dac->dela_state, args->dp);
 		return -EAGAIN;
 
 	case XFS_DAS_FLIP_NFLAG:
@@ -603,6 +616,10 @@ xfs_attr_set_iter(
 		dac->dela_state = XFS_DAS_RM_NBLK;
 		if (args->rmtblkno) {
 			error = __xfs_attr_rmtval_remove(dac);
+			if (error == -EAGAIN)
+				trace_xfs_attr_set_iter_return(
+					dac->dela_state, args->dp);
+
 			if (error)
 				return error;
 
@@ -1183,6 +1200,8 @@ xfs_attr_node_addname(
 			 * this point.
 			 */
 			dac->flags |= XFS_DAC_DEFER_FINISH;
+			trace_xfs_attr_node_addname_return(
+					dac->dela_state, args->dp);
 			return -EAGAIN;
 		}
 
@@ -1429,10 +1448,13 @@ xfs_attr_remove_iter(
 			 * blocks are removed.
 			 */
 			error = __xfs_attr_rmtval_remove(dac);
-			if (error == -EAGAIN)
+			if (error == -EAGAIN) {
+				trace_xfs_attr_remove_iter_return(
+						dac->dela_state, args->dp);
 				return error;
-			else if (error)
+			} else if (error) {
 				goto out;
+			}
 
 			/*
 			 * Refill the state structure with buffers (the prior
@@ -1473,6 +1495,8 @@ xfs_attr_remove_iter(
 
 			dac->flags |= XFS_DAC_DEFER_FINISH;
 			dac->dela_state = XFS_DAS_RM_SHRINK;
+			trace_xfs_attr_remove_iter_return(
+					dac->dela_state, args->dp);
 			return -EAGAIN;
 		}
 
diff --git a/fs/xfs/libxfs/xfs_attr_remote.c b/fs/xfs/libxfs/xfs_attr_remote.c
index 0c8bee3..70f880d 100644
--- a/fs/xfs/libxfs/xfs_attr_remote.c
+++ b/fs/xfs/libxfs/xfs_attr_remote.c
@@ -696,6 +696,7 @@ __xfs_attr_rmtval_remove(
 	 */
 	if (!done) {
 		dac->flags |= XFS_DAC_DEFER_FINISH;
+		trace_xfs_attr_rmtval_remove_return(dac->dela_state, args->dp);
 		return -EAGAIN;
 	}
 
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index f9d8d60..f9840dd 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -3987,6 +3987,30 @@ DEFINE_ICLOG_EVENT(xlog_iclog_want_sync);
 DEFINE_ICLOG_EVENT(xlog_iclog_wait_on);
 DEFINE_ICLOG_EVENT(xlog_iclog_write);
 
+DECLARE_EVENT_CLASS(xfs_das_state_class,
+	TP_PROTO(int das, struct xfs_inode *ip),
+	TP_ARGS(das, ip),
+	TP_STRUCT__entry(
+		__field(int, das)
+		__field(xfs_ino_t, ino)
+	),
+	TP_fast_assign(
+		__entry->das = das;
+		__entry->ino = ip->i_ino;
+	),
+	TP_printk("state change %d ino 0x%llx",
+		  __entry->das, __entry->ino)
+)
+
+#define DEFINE_DAS_STATE_EVENT(name) \
+DEFINE_EVENT(xfs_das_state_class, name, \
+	TP_PROTO(int das, struct xfs_inode *ip), \
+	TP_ARGS(das, ip))
+DEFINE_DAS_STATE_EVENT(xfs_attr_sf_addname_return);
+DEFINE_DAS_STATE_EVENT(xfs_attr_set_iter_return);
+DEFINE_DAS_STATE_EVENT(xfs_attr_node_addname_return);
+DEFINE_DAS_STATE_EVENT(xfs_attr_remove_iter_return);
+DEFINE_DAS_STATE_EVENT(xfs_attr_rmtval_remove_return);
 #endif /* _TRACE_XFS_H */
 
 #undef TRACE_INCLUDE_PATH
-- 
2.7.4

[PATCH v21 03/13] xfs: Rename __xfs_attr_rmtval_remove

[Allison Henderson]

Now that xfs_attr_rmtval_remove is gone, rename __xfs_attr_rmtval_remove
to xfs_attr_rmtval_remove

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 fs/xfs/libxfs/xfs_attr.c        | 6 +++---
 fs/xfs/libxfs/xfs_attr_remote.c | 2 +-
 fs/xfs/libxfs/xfs_attr_remote.h | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index cb6eac1..8d51607 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -502,7 +502,7 @@ xfs_attr_set_iter(
 		/* Set state in case xfs_attr_rmtval_remove returns -EAGAIN */
 		dac->dela_state = XFS_DAS_RM_LBLK;
 		if (args->rmtblkno) {
-			error = __xfs_attr_rmtval_remove(dac);
+			error = xfs_attr_rmtval_remove(dac);
 			if (error == -EAGAIN)
 				trace_xfs_attr_set_iter_return(
 					dac->dela_state, args->dp);
@@ -615,7 +615,7 @@ xfs_attr_set_iter(
 		/* Set state in case xfs_attr_rmtval_remove returns -EAGAIN */
 		dac->dela_state = XFS_DAS_RM_NBLK;
 		if (args->rmtblkno) {
-			error = __xfs_attr_rmtval_remove(dac);
+			error = xfs_attr_rmtval_remove(dac);
 			if (error == -EAGAIN)
 				trace_xfs_attr_set_iter_return(
 					dac->dela_state, args->dp);
@@ -1447,7 +1447,7 @@ xfs_attr_remove_iter(
 			 * May return -EAGAIN. Roll and repeat until all remote
 			 * blocks are removed.
 			 */
-			error = __xfs_attr_rmtval_remove(dac);
+			error = xfs_attr_rmtval_remove(dac);
 			if (error == -EAGAIN) {
 				trace_xfs_attr_remove_iter_return(
 						dac->dela_state, args->dp);
diff --git a/fs/xfs/libxfs/xfs_attr_remote.c b/fs/xfs/libxfs/xfs_attr_remote.c
index 70f880d..1669043 100644
--- a/fs/xfs/libxfs/xfs_attr_remote.c
+++ b/fs/xfs/libxfs/xfs_attr_remote.c
@@ -672,7 +672,7 @@ xfs_attr_rmtval_invalidate(
  * routine until it returns something other than -EAGAIN.
  */
 int
-__xfs_attr_rmtval_remove(
+xfs_attr_rmtval_remove(
 	struct xfs_delattr_context	*dac)
 {
 	struct xfs_da_args		*args = dac->da_args;
diff --git a/fs/xfs/libxfs/xfs_attr_remote.h b/fs/xfs/libxfs/xfs_attr_remote.h
index 61b85b9..d72eff3 100644
--- a/fs/xfs/libxfs/xfs_attr_remote.h
+++ b/fs/xfs/libxfs/xfs_attr_remote.h
@@ -12,7 +12,7 @@ int xfs_attr_rmtval_get(struct xfs_da_args *args);
 int xfs_attr_rmtval_stale(struct xfs_inode *ip, struct xfs_bmbt_irec *map,
 		xfs_buf_flags_t incore_flags);
 int xfs_attr_rmtval_invalidate(struct xfs_da_args *args);
-int __xfs_attr_rmtval_remove(struct xfs_delattr_context *dac);
+int xfs_attr_rmtval_remove(struct xfs_delattr_context *dac);
 int xfs_attr_rmt_find_hole(struct xfs_da_args *args);
 int xfs_attr_rmtval_set_value(struct xfs_da_args *args);
 int xfs_attr_rmtval_set_blk(struct xfs_delattr_context *dac);
-- 
2.7.4

[PATCH v21 04/13] xfs: Handle krealloc errors in xlog_recover_add_to_cont_trans

[Allison Henderson]

Because xattrs can be over a page in size, we need to handle possible
krealloc errors to avoid warnings.  If the allocation does fail, fall
back to kmem_alloc_large, with a memcpy.

The warning:
   WARNING: CPU: 1 PID: 20255 at mm/page_alloc.c:3446
                 get_page_from_freelist+0x100b/0x1690

is caused when sizes larger that a page are allocated with the
__GFP_NOFAIL flag option.  We encounter this error now because attr
values can be up to 64k in size.  So we cannot use __GFP_NOFAIL, and
we need to handle the error code if the allocation fails.

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
---
 fs/xfs/xfs_log_recover.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index ec4ccae..6ab467b 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -2062,7 +2062,15 @@ xlog_recover_add_to_cont_trans(
 	old_ptr = item->ri_buf[item->ri_cnt-1].i_addr;
 	old_len = item->ri_buf[item->ri_cnt-1].i_len;
 
-	ptr = krealloc(old_ptr, len + old_len, GFP_KERNEL | __GFP_NOFAIL);
+	ptr = krealloc(old_ptr, len + old_len, GFP_KERNEL);
+	if (ptr == NULL) {
+		ptr = kmem_alloc_large(len + old_len, KM_ZERO);
+		if (ptr == NULL)
+			return -ENOMEM;
+
+		memcpy(ptr, old_ptr, old_len);
+	}
+
 	memcpy(&ptr[old_len], dp, len);
 	item->ri_buf[item->ri_cnt-1].i_len += len;
 	item->ri_buf[item->ri_cnt-1].i_addr = ptr;
-- 
2.7.4

[PATCH v21 05/13] xfs: Set up infrastructure for deferred attribute operations

[Allison Henderson]

Currently attributes are modified directly across one or more
transactions. But they are not logged or replayed in the event of an
error. The goal of delayed attributes is to enable logging and replaying
of attribute operations using the existing delayed operations
infrastructure.  This will later enable the attributes to become part of
larger multi part operations that also must first be recorded to the
log.  This is mostly of interest in the scheme of parent pointers which
would need to maintain an attribute containing parent inode information
any time an inode is moved, created, or removed.  Parent pointers would
then be of interest to any feature that would need to quickly derive an
inode path from the mount point. Online scrub, nfs lookups and fs grow
or shrink operations are all features that could take advantage of this.

This patch adds two new log item types for setting or removing
attributes as deferred operations.  The xfs_attri_log_item will log an
intent to set or remove an attribute.  The corresponding
xfs_attrd_log_item holds a reference to the xfs_attri_log_item and is
freed once the transaction is done.  Both log items use a generic
xfs_attr_log_format structure that contains the attribute name, value,
flags, inode, and an op_flag that indicates if the operations is a set
or remove.

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
---
 fs/xfs/Makefile                 |   1 +
 fs/xfs/libxfs/xfs_attr.c        |   5 +-
 fs/xfs/libxfs/xfs_attr.h        |  31 +++
 fs/xfs/libxfs/xfs_defer.h       |   2 +
 fs/xfs/libxfs/xfs_log_format.h  |  44 +++-
 fs/xfs/libxfs/xfs_log_recover.h |   2 +
 fs/xfs/scrub/common.c           |   2 +
 fs/xfs/xfs_acl.c                |   2 +
 fs/xfs/xfs_attr_item.c          | 460 ++++++++++++++++++++++++++++++++++++++++
 fs/xfs/xfs_attr_item.h          |  52 +++++
 fs/xfs/xfs_attr_list.c          |   1 +
 fs/xfs/xfs_ioctl.c              |   2 +
 fs/xfs/xfs_ioctl32.c            |   2 +
 fs/xfs/xfs_iops.c               |   2 +
 fs/xfs/xfs_log_recover.c        |   2 +
 fs/xfs/xfs_ondisk.h             |   2 +
 fs/xfs/xfs_xattr.c              |   1 +
 17 files changed, 608 insertions(+), 5 deletions(-)

diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index 04611a1..b056cfc 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -102,6 +102,7 @@ xfs-y				+= xfs_log.o \
 				   xfs_buf_item_recover.o \
 				   xfs_dquot_item_recover.o \
 				   xfs_extfree_item.o \
+				   xfs_attr_item.o \
 				   xfs_icreate_item.o \
 				   xfs_inode_item.o \
 				   xfs_inode_item_recover.o \
diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index 8d51607..bdcdadc 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -24,6 +24,7 @@
 #include "xfs_quota.h"
 #include "xfs_trans_space.h"
 #include "xfs_trace.h"
+#include "xfs_attr_item.h"
 
 /*
  * xfs_attr.c
@@ -61,8 +62,6 @@ STATIC int xfs_attr_node_hasname(xfs_da_args_t *args,
 				 struct xfs_da_state **state);
 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
-STATIC int xfs_attr_set_iter(struct xfs_delattr_context *dac,
-			     struct xfs_buf **leaf_bp);
 STATIC int xfs_attr_node_removename(struct xfs_da_args *args,
 				    struct xfs_da_state *state);
 
@@ -166,7 +165,7 @@ xfs_attr_get(
 /*
  * Calculate how many blocks we need for the new attribute,
  */
-STATIC int
+int
 xfs_attr_calc_size(
 	struct xfs_da_args	*args,
 	int			*local)
diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
index 8de5d1d..4ee5165 100644
--- a/fs/xfs/libxfs/xfs_attr.h
+++ b/fs/xfs/libxfs/xfs_attr.h
@@ -28,6 +28,11 @@ struct xfs_attr_list_context;
  */
 #define	ATTR_MAX_VALUELEN	(64*1024)	/* max length of a value */
 
+static inline bool xfs_hasdelattr(struct xfs_mount *mp)
+{
+	return false;
+}
+
 /*
  * Kernel-internal version of the attrlist cursor.
  */
@@ -454,6 +459,7 @@ enum xfs_delattr_state {
  */
 #define XFS_DAC_DEFER_FINISH		0x01 /* finish the transaction */
 #define XFS_DAC_LEAF_ADDNAME_INIT	0x02 /* xfs_attr_leaf_addname init*/
+#define XFS_DAC_DELAYED_OP_INIT		0x04 /* delayed operations init*/
 
 /*
  * Context used for keeping track of delayed attribute operations
@@ -461,6 +467,11 @@ enum xfs_delattr_state {
 struct xfs_delattr_context {
 	struct xfs_da_args      *da_args;
 
+	/*
+	 * Used by xfs_attr_set to hold a leaf buffer across a transaction roll
+	 */
+	struct xfs_buf		*leaf_bp;
+
 	/* Used in xfs_attr_rmtval_set_blk to roll through allocating blocks */
 	struct xfs_bmbt_irec	map;
 	xfs_dablk_t		lblkno;
@@ -474,6 +485,23 @@ struct xfs_delattr_context {
 	enum xfs_delattr_state  dela_state;
 };
 
+/*
+ * List of attrs to commit later.
+ */
+struct xfs_attr_item {
+	struct xfs_delattr_context	xattri_dac;
+
+	/*
+	 * Indicates if the attr operation is a set or a remove
+	 * XFS_ATTR_OP_FLAGS_{SET,REMOVE}
+	 */
+	uint32_t			xattri_op_flags;
+
+	/* used to log this item to an intent */
+	struct list_head		xattri_list;
+};
+
+
 /*========================================================================
  * Function prototypes for the kernel.
  *========================================================================*/
@@ -490,11 +518,14 @@ int xfs_attr_get_ilocked(struct xfs_da_args *args);
 int xfs_attr_get(struct xfs_da_args *args);
 int xfs_attr_set(struct xfs_da_args *args);
 int xfs_attr_set_args(struct xfs_da_args *args);
+int xfs_attr_set_iter(struct xfs_delattr_context *dac,
+		      struct xfs_buf **leaf_bp);
 int xfs_has_attr(struct xfs_da_args *args);
 int xfs_attr_remove_args(struct xfs_da_args *args);
 int xfs_attr_remove_iter(struct xfs_delattr_context *dac);
 bool xfs_attr_namecheck(const void *name, size_t length);
 void xfs_delattr_context_init(struct xfs_delattr_context *dac,
 			      struct xfs_da_args *args);
+int xfs_attr_calc_size(struct xfs_da_args *args, int *local);
 
 #endif	/* __XFS_ATTR_H__ */
diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
index 05472f7..0ed9dfa 100644
--- a/fs/xfs/libxfs/xfs_defer.h
+++ b/fs/xfs/libxfs/xfs_defer.h
@@ -63,6 +63,8 @@ extern const struct xfs_defer_op_type xfs_refcount_update_defer_type;
 extern const struct xfs_defer_op_type xfs_rmap_update_defer_type;
 extern const struct xfs_defer_op_type xfs_extent_free_defer_type;
 extern const struct xfs_defer_op_type xfs_agfl_free_defer_type;
+extern const struct xfs_defer_op_type xfs_attr_defer_type;
+
 
 /*
  * This structure enables a dfops user to detach the chain of deferred
diff --git a/fs/xfs/libxfs/xfs_log_format.h b/fs/xfs/libxfs/xfs_log_format.h
index 78d5368..34011c8 100644
--- a/fs/xfs/libxfs/xfs_log_format.h
+++ b/fs/xfs/libxfs/xfs_log_format.h
@@ -113,7 +113,12 @@ struct xfs_unmount_log_format {
 #define XLOG_REG_TYPE_CUD_FORMAT	24
 #define XLOG_REG_TYPE_BUI_FORMAT	25
 #define XLOG_REG_TYPE_BUD_FORMAT	26
-#define XLOG_REG_TYPE_MAX		26
+#define XLOG_REG_TYPE_ATTRI_FORMAT	27
+#define XLOG_REG_TYPE_ATTRD_FORMAT	28
+#define XLOG_REG_TYPE_ATTR_NAME	29
+#define XLOG_REG_TYPE_ATTR_VALUE	30
+#define XLOG_REG_TYPE_MAX		30
+
 
 /*
  * Flags to log operation header
@@ -236,6 +241,8 @@ typedef struct xfs_trans_header {
 #define	XFS_LI_CUD		0x1243
 #define	XFS_LI_BUI		0x1244	/* bmbt update intent */
 #define	XFS_LI_BUD		0x1245
+#define	XFS_LI_ATTRI		0x1246  /* attr set/remove intent*/
+#define	XFS_LI_ATTRD		0x1247  /* attr set/remove done */
 
 #define XFS_LI_TYPE_DESC \
 	{ XFS_LI_EFI,		"XFS_LI_EFI" }, \
@@ -251,7 +258,9 @@ typedef struct xfs_trans_header {
 	{ XFS_LI_CUI,		"XFS_LI_CUI" }, \
 	{ XFS_LI_CUD,		"XFS_LI_CUD" }, \
 	{ XFS_LI_BUI,		"XFS_LI_BUI" }, \
-	{ XFS_LI_BUD,		"XFS_LI_BUD" }
+	{ XFS_LI_BUD,		"XFS_LI_BUD" }, \
+	{ XFS_LI_ATTRI,		"XFS_LI_ATTRI" }, \
+	{ XFS_LI_ATTRD,		"XFS_LI_ATTRD" }
 
 /*
  * Inode Log Item Format definitions.
@@ -859,4 +868,35 @@ struct xfs_icreate_log {
 	__be32		icl_gen;	/* inode generation number to use */
 };
 
+/*
+ * Flags for deferred attribute operations.
+ * Upper bits are flags, lower byte is type code
+ */
+#define XFS_ATTR_OP_FLAGS_SET		1	/* Set the attribute */
+#define XFS_ATTR_OP_FLAGS_REMOVE	2	/* Remove the attribute */
+#define XFS_ATTR_OP_FLAGS_TYPE_MASK	0x0FF	/* Flags type mask */
+
+/*
+ * This is the structure used to lay out an attr log item in the
+ * log.
+ */
+struct xfs_attri_log_format {
+	uint16_t	alfi_type;	/* attri log item type */
+	uint16_t	alfi_size;	/* size of this item */
+	uint32_t	__pad;		/* pad to 64 bit aligned */
+	uint64_t	alfi_id;	/* attri identifier */
+	uint64_t	alfi_ino;	/* the inode for this attr operation */
+	uint32_t	alfi_op_flags;	/* marks the op as a set or remove */
+	uint32_t	alfi_name_len;	/* attr name length */
+	uint32_t	alfi_value_len;	/* attr value length */
+	uint32_t	alfi_attr_flags;/* attr flags */
+};
+
+struct xfs_attrd_log_format {
+	uint16_t	alfd_type;	/* attrd log item type */
+	uint16_t	alfd_size;	/* size of this item */
+	uint32_t	__pad;		/* pad to 64 bit aligned */
+	uint64_t	alfd_alf_id;	/* id of corresponding attri */
+};
+
 #endif /* __XFS_LOG_FORMAT_H__ */
diff --git a/fs/xfs/libxfs/xfs_log_recover.h b/fs/xfs/libxfs/xfs_log_recover.h
index 3cca2bf..b6e5514 100644
--- a/fs/xfs/libxfs/xfs_log_recover.h
+++ b/fs/xfs/libxfs/xfs_log_recover.h
@@ -72,6 +72,8 @@ extern const struct xlog_recover_item_ops xlog_rui_item_ops;
 extern const struct xlog_recover_item_ops xlog_rud_item_ops;
 extern const struct xlog_recover_item_ops xlog_cui_item_ops;
 extern const struct xlog_recover_item_ops xlog_cud_item_ops;
+extern const struct xlog_recover_item_ops xlog_attri_item_ops;
+extern const struct xlog_recover_item_ops xlog_attrd_item_ops;
 
 /*
  * Macros, structures, prototypes for internal log manager use.
diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
index cadfd57..32e46f8 100644
--- a/fs/xfs/scrub/common.c
+++ b/fs/xfs/scrub/common.c
@@ -23,6 +23,8 @@
 #include "xfs_rmap_btree.h"
 #include "xfs_log.h"
 #include "xfs_trans_priv.h"
+#include "xfs_da_format.h"
+#include "xfs_da_btree.h"
 #include "xfs_attr.h"
 #include "xfs_reflink.h"
 #include "xfs_ag.h"
diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c
index d02bef2..b8673c6 100644
--- a/fs/xfs/xfs_acl.c
+++ b/fs/xfs/xfs_acl.c
@@ -10,6 +10,8 @@
 #include "xfs_trans_resv.h"
 #include "xfs_mount.h"
 #include "xfs_inode.h"
+#include "xfs_da_format.h"
+#include "xfs_da_btree.h"
 #include "xfs_attr.h"
 #include "xfs_trace.h"
 #include "xfs_error.h"
diff --git a/fs/xfs/xfs_attr_item.c b/fs/xfs/xfs_attr_item.c
new file mode 100644
index 0000000..c9033e2
--- /dev/null
+++ b/fs/xfs/xfs_attr_item.c
@@ -0,0 +1,460 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2021 Oracle.  All Rights Reserved.
+ * Author: Allison Collins <allison.henderson@oracle.com>
+ */
+
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_bit.h"
+#include "xfs_shared.h"
+#include "xfs_mount.h"
+#include "xfs_defer.h"
+#include "xfs_da_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans.h"
+#include "xfs_bmap.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_trans_priv.h"
+#include "xfs_buf_item.h"
+#include "xfs_attr_item.h"
+#include "xfs_log.h"
+#include "xfs_btree.h"
+#include "xfs_rmap.h"
+#include "xfs_inode.h"
+#include "xfs_icache.h"
+#include "xfs_da_format.h"
+#include "xfs_da_btree.h"
+#include "xfs_attr.h"
+#include "xfs_shared.h"
+#include "xfs_attr_item.h"
+#include "xfs_alloc.h"
+#include "xfs_bmap.h"
+#include "xfs_trace.h"
+#include "libxfs/xfs_da_format.h"
+#include "xfs_inode.h"
+#include "xfs_quota.h"
+#include "xfs_trans_space.h"
+#include "xfs_error.h"
+#include "xfs_log_priv.h"
+#include "xfs_log_recover.h"
+
+static const struct xfs_item_ops xfs_attri_item_ops;
+static const struct xfs_item_ops xfs_attrd_item_ops;
+
+/* iovec length must be 32-bit aligned */
+static inline size_t ATTR_NVEC_SIZE(size_t size)
+{
+	return size == sizeof(int32_t) ? size :
+	       sizeof(int32_t) + round_up(size, sizeof(int32_t));
+}
+
+static inline struct xfs_attri_log_item *ATTRI_ITEM(struct xfs_log_item *lip)
+{
+	return container_of(lip, struct xfs_attri_log_item, attri_item);
+}
+
+STATIC void
+xfs_attri_item_free(
+	struct xfs_attri_log_item	*attrip)
+{
+	kmem_free(attrip->attri_item.li_lv_shadow);
+	kmem_free(attrip);
+}
+
+/*
+ * Freeing the attrip requires that we remove it from the AIL if it has already
+ * been placed there. However, the ATTRI may not yet have been placed in the
+ * AIL when called by xfs_attri_release() from ATTRD processing due to the
+ * ordering of committed vs unpin operations in bulk insert operations. Hence
+ * the reference count to ensure only the last caller frees the ATTRI.
+ */
+STATIC void
+xfs_attri_release(
+	struct xfs_attri_log_item	*attrip)
+{
+	ASSERT(atomic_read(&attrip->attri_refcount) > 0);
+	if (atomic_dec_and_test(&attrip->attri_refcount)) {
+		xfs_trans_ail_delete(&attrip->attri_item,
+				     SHUTDOWN_LOG_IO_ERROR);
+		xfs_attri_item_free(attrip);
+	}
+}
+
+STATIC void
+xfs_attri_item_size(
+	struct xfs_log_item	*lip,
+	int			*nvecs,
+	int			*nbytes)
+{
+	struct xfs_attri_log_item       *attrip = ATTRI_ITEM(lip);
+
+	*nvecs += 1;
+	*nbytes += sizeof(struct xfs_attri_log_format);
+
+	/* Attr set and remove operations require a name */
+	ASSERT(attrip->attri_name_len > 0);
+
+	*nvecs += 1;
+	*nbytes += ATTR_NVEC_SIZE(attrip->attri_name_len);
+
+	/*
+	 * Set ops can accept a value of 0 len to clear an attr value.  Remove
+	 * ops do not need a value at all.  So only account for the value
+	 * when it is needed.
+	 */
+	if (attrip->attri_value_len > 0) {
+		*nvecs += 1;
+		*nbytes += ATTR_NVEC_SIZE(attrip->attri_value_len);
+	}
+}
+
+/*
+ * This is called to fill in the log iovecs for the given attri log
+ * item. We use  1 iovec for the attri_format_item, 1 for the name, and
+ * another for the value if it is present
+ */
+STATIC void
+xfs_attri_item_format(
+	struct xfs_log_item	*lip,
+	struct xfs_log_vec	*lv)
+{
+	struct xfs_attri_log_item	*attrip = ATTRI_ITEM(lip);
+	struct xfs_log_iovec		*vecp = NULL;
+
+	attrip->attri_format.alfi_type = XFS_LI_ATTRI;
+	attrip->attri_format.alfi_size = 1;
+
+	/*
+	 * This size accounting must be done before copying the attrip into the
+	 * iovec.  If we do it after, the wrong size will be recorded to the log
+	 * and we trip across assertion checks for bad region sizes later during
+	 * the log recovery.
+	 */
+
+	ASSERT(attrip->attri_name_len > 0);
+	attrip->attri_format.alfi_size++;
+
+	if (attrip->attri_value_len > 0)
+		attrip->attri_format.alfi_size++;
+
+	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ATTRI_FORMAT,
+			&attrip->attri_format,
+			sizeof(struct xfs_attri_log_format));
+	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ATTR_NAME,
+			attrip->attri_name,
+			ATTR_NVEC_SIZE(attrip->attri_name_len));
+	if (attrip->attri_value_len > 0)
+		xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ATTR_VALUE,
+				attrip->attri_value,
+				ATTR_NVEC_SIZE(attrip->attri_value_len));
+}
+
+/*
+ * The unpin operation is the last place an ATTRI is manipulated in the log. It
+ * is either inserted in the AIL or aborted in the event of a log I/O error. In
+ * either case, the ATTRI transaction has been successfully committed to make
+ * it this far. Therefore, we expect whoever committed the ATTRI to either
+ * construct and commit the ATTRD or drop the ATTRD's reference in the event of
+ * error. Simply drop the log's ATTRI reference now that the log is done with
+ * it.
+ */
+STATIC void
+xfs_attri_item_unpin(
+	struct xfs_log_item	*lip,
+	int			remove)
+{
+	xfs_attri_release(ATTRI_ITEM(lip));
+}
+
+
+STATIC void
+xfs_attri_item_release(
+	struct xfs_log_item	*lip)
+{
+	xfs_attri_release(ATTRI_ITEM(lip));
+}
+
+/*
+ * Allocate and initialize an attri item.  Caller may allocate an additional
+ * trailing buffer of the specified size
+ */
+STATIC struct xfs_attri_log_item *
+xfs_attri_init(
+	struct xfs_mount		*mp,
+	int				buffer_size)
+
+{
+	struct xfs_attri_log_item	*attrip;
+	uint				size;
+
+	size = sizeof(struct xfs_attri_log_item) + buffer_size;
+	attrip = kmem_alloc_large(size, KM_ZERO);
+	if (attrip == NULL)
+		return NULL;
+
+	xfs_log_item_init(mp, &attrip->attri_item, XFS_LI_ATTRI,
+			  &xfs_attri_item_ops);
+	attrip->attri_format.alfi_id = (uintptr_t)(void *)attrip;
+	atomic_set(&attrip->attri_refcount, 2);
+
+	return attrip;
+}
+
+/*
+ * Copy an attr format buffer from the given buf, and into the destination attr
+ * format structure.
+ */
+STATIC int
+xfs_attri_copy_format(
+	struct xfs_log_iovec		*buf,
+	struct xfs_attri_log_format	*dst_attr_fmt)
+{
+	struct xfs_attri_log_format	*src_attr_fmt = buf->i_addr;
+	uint				len;
+
+	len = sizeof(struct xfs_attri_log_format);
+	if (buf->i_len != len)
+		return -EFSCORRUPTED;
+
+	memcpy((char *)dst_attr_fmt, (char *)src_attr_fmt, len);
+	return 0;
+}
+
+static inline struct xfs_attrd_log_item *ATTRD_ITEM(struct xfs_log_item *lip)
+{
+	return container_of(lip, struct xfs_attrd_log_item, attrd_item);
+}
+
+STATIC void
+xfs_attrd_item_free(struct xfs_attrd_log_item *attrdp)
+{
+	kmem_free(attrdp->attrd_item.li_lv_shadow);
+	kmem_free(attrdp);
+}
+
+STATIC void
+xfs_attrd_item_size(
+	struct xfs_log_item		*lip,
+	int				*nvecs,
+	int				*nbytes)
+{
+	*nvecs += 1;
+	*nbytes += sizeof(struct xfs_attrd_log_format);
+}
+
+/*
+ * This is called to fill in the log iovecs for the given attrd log item. We use
+ * only 1 iovec for the attrd_format, and we point that at the attr_log_format
+ * structure embedded in the attrd item.
+ */
+STATIC void
+xfs_attrd_item_format(
+	struct xfs_log_item	*lip,
+	struct xfs_log_vec	*lv)
+{
+	struct xfs_attrd_log_item	*attrdp = ATTRD_ITEM(lip);
+	struct xfs_log_iovec		*vecp = NULL;
+
+	attrdp->attrd_format.alfd_type = XFS_LI_ATTRD;
+	attrdp->attrd_format.alfd_size = 1;
+
+	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ATTRD_FORMAT,
+			&attrdp->attrd_format,
+			sizeof(struct xfs_attrd_log_format));
+}
+
+/*
+ * The ATTRD is either committed or aborted if the transaction is canceled. If
+ * the transaction is canceled, drop our reference to the ATTRI and free the
+ * ATTRD.
+ */
+STATIC void
+xfs_attrd_item_release(
+	struct xfs_log_item		*lip)
+{
+	struct xfs_attrd_log_item	*attrdp = ATTRD_ITEM(lip);
+
+	xfs_attri_release(attrdp->attrd_attrip);
+	xfs_attrd_item_free(attrdp);
+}
+
+STATIC xfs_lsn_t
+xfs_attri_item_committed(
+	struct xfs_log_item		*lip,
+	xfs_lsn_t			lsn)
+{
+	struct xfs_attri_log_item	*attrip;
+	/*
+	 * The attrip refers to xfs_attr_item memory to log the name and value
+	 * with the intent item. This already occurred when the intent was
+	 * committed so these fields are no longer accessed. Clear them out of
+	 * caution since we're about to free the xfs_attr_item.
+	 */
+	attrip = ATTRI_ITEM(lip);
+	attrip->attri_name = NULL;
+	attrip->attri_value = NULL;
+
+	/*
+	 * The ATTRI is logged only once and cannot be moved in the log, so
+	 * simply return the lsn at which it's been logged.
+	 */
+	return lsn;
+}
+
+STATIC bool
+xfs_attri_item_match(
+	struct xfs_log_item	*lip,
+	uint64_t		intent_id)
+{
+	return ATTRI_ITEM(lip)->attri_format.alfi_id == intent_id;
+}
+
+static const struct xfs_item_ops xfs_attrd_item_ops = {
+	.flags		= XFS_ITEM_RELEASE_WHEN_COMMITTED,
+	.iop_size	= xfs_attrd_item_size,
+	.iop_format	= xfs_attrd_item_format,
+	.iop_release    = xfs_attrd_item_release,
+};
+
+/* Is this recovered ATTRI ok? */
+static inline bool
+xfs_attri_validate(
+	struct xfs_mount		*mp,
+	struct xfs_attri_log_item	*attrip)
+{
+	struct xfs_attri_log_format     *attrp = &attrip->attri_format;
+
+	/* alfi_op_flags should be either a set or remove */
+	if (attrp->alfi_op_flags != XFS_ATTR_OP_FLAGS_SET &&
+	    attrp->alfi_op_flags != XFS_ATTR_OP_FLAGS_REMOVE)
+		return false;
+
+	if (attrp->alfi_value_len > XATTR_SIZE_MAX)
+		return false;
+
+	if ((attrp->alfi_name_len > XATTR_NAME_MAX) ||
+	    (attrp->alfi_name_len == 0))
+		return false;
+
+	if (!xfs_verify_ino(mp, attrp->alfi_ino))
+		return false;
+
+	return xfs_hasdelattr(mp);
+}
+
+static const struct xfs_item_ops xfs_attri_item_ops = {
+	.iop_size	= xfs_attri_item_size,
+	.iop_format	= xfs_attri_item_format,
+	.iop_unpin	= xfs_attri_item_unpin,
+	.iop_committed	= xfs_attri_item_committed,
+	.iop_release    = xfs_attri_item_release,
+	.iop_match	= xfs_attri_item_match,
+};
+
+
+
+STATIC int
+xlog_recover_attri_commit_pass2(
+	struct xlog                     *log,
+	struct list_head		*buffer_list,
+	struct xlog_recover_item        *item,
+	xfs_lsn_t                       lsn)
+{
+	int                             error;
+	struct xfs_mount                *mp = log->l_mp;
+	struct xfs_attri_log_item       *attrip;
+	struct xfs_attri_log_format     *attri_formatp;
+	char				*name = NULL;
+	char				*value = NULL;
+	int				region = 0;
+	int				buffer_size;
+
+	attri_formatp = item->ri_buf[region].i_addr;
+
+	/* Validate xfs_attri_log_format */
+	if (attri_formatp->__pad != 0 || attri_formatp->alfi_name_len == 0 ||
+	    (attri_formatp->alfi_op_flags == XFS_ATTR_OP_FLAGS_REMOVE &&
+	    attri_formatp->alfi_value_len != 0)) {
+		XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp);
+		return -EFSCORRUPTED;
+	}
+
+	buffer_size = attri_formatp->alfi_name_len +
+		      attri_formatp->alfi_value_len;
+
+	attrip = xfs_attri_init(mp, buffer_size);
+	if (attrip == NULL)
+		return -ENOMEM;
+
+	error = xfs_attri_copy_format(&item->ri_buf[region],
+				      &attrip->attri_format);
+	if (error) {
+		xfs_attri_item_free(attrip);
+		return error;
+	}
+
+	attrip->attri_name_len = attri_formatp->alfi_name_len;
+	attrip->attri_value_len = attri_formatp->alfi_value_len;
+	region++;
+	name = ((char *)attrip) + sizeof(struct xfs_attri_log_item);
+	memcpy(name, item->ri_buf[region].i_addr, attrip->attri_name_len);
+	attrip->attri_name = name;
+
+	if (attrip->attri_value_len > 0) {
+		region++;
+		value = ((char *)attrip) + sizeof(struct xfs_attri_log_item) +
+			attrip->attri_name_len;
+		memcpy(value, item->ri_buf[region].i_addr,
+			attrip->attri_value_len);
+		attrip->attri_value = value;
+	}
+
+	/*
+	 * The ATTRI has two references. One for the ATTRD and one for ATTRI to
+	 * ensure it makes it into the AIL. Insert the ATTRI into the AIL
+	 * directly and drop the ATTRI reference. Note that
+	 * xfs_trans_ail_update() drops the AIL lock.
+	 */
+	xfs_trans_ail_insert(log->l_ailp, &attrip->attri_item, lsn);
+	xfs_attri_release(attrip);
+	return 0;
+}
+
+const struct xlog_recover_item_ops xlog_attri_item_ops = {
+	.item_type	= XFS_LI_ATTRI,
+	.commit_pass2	= xlog_recover_attri_commit_pass2,
+};
+
+/*
+ * This routine is called when an ATTRD format structure is found in a committed
+ * transaction in the log. Its purpose is to cancel the corresponding ATTRI if
+ * it was still in the log. To do this it searches the AIL for the ATTRI with
+ * an id equal to that in the ATTRD format structure. If we find it we drop
+ * the ATTRD reference, which removes the ATTRI from the AIL and frees it.
+ */
+STATIC int
+xlog_recover_attrd_commit_pass2(
+	struct xlog			*log,
+	struct list_head		*buffer_list,
+	struct xlog_recover_item	*item,
+	xfs_lsn_t			lsn)
+{
+	struct xfs_attrd_log_format	*attrd_formatp;
+
+	attrd_formatp = item->ri_buf[0].i_addr;
+	ASSERT((item->ri_buf[0].i_len ==
+				(sizeof(struct xfs_attrd_log_format))));
+
+	xlog_recover_release_intent(log, XFS_LI_ATTRI,
+				    attrd_formatp->alfd_alf_id);
+	return 0;
+}
+
+const struct xlog_recover_item_ops xlog_attrd_item_ops = {
+	.item_type	= XFS_LI_ATTRD,
+	.commit_pass2	= xlog_recover_attrd_commit_pass2,
+};
diff --git a/fs/xfs/xfs_attr_item.h b/fs/xfs/xfs_attr_item.h
new file mode 100644
index 0000000..594a5dd
--- /dev/null
+++ b/fs/xfs/xfs_attr_item.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * Copyright (C) 2019 Oracle.  All Rights Reserved.
+ * Author: Allison Collins <allison.henderson@oracle.com>
+ */
+#ifndef	__XFS_ATTR_ITEM_H__
+#define	__XFS_ATTR_ITEM_H__
+
+/* kernel only ATTRI/ATTRD definitions */
+
+struct xfs_mount;
+struct kmem_zone;
+
+/*
+ * Define ATTR flag bits. Manipulated by set/clear/test_bit operators.
+ */
+#define	XFS_ATTRI_RECOVERED	1
+
+
+/*
+ * This is the "attr intention" log item.  It is used to log the fact that some
+ * attribute operations need to be processed.  An operation is currently either
+ * a set or remove.  Set or remove operations are described by the xfs_attr_item
+ * which may be logged to this intent.
+ *
+ * During a normal attr operation, name and value point to the name and value
+ * fields of the calling functions xfs_da_args.  During a recovery, the name
+ * and value buffers are copied from the log, and stored in a trailing buffer
+ * attached to the xfs_attr_item until they are committed.  They are freed when
+ * the xfs_attr_item itself is freed when the work is done.
+ */
+struct xfs_attri_log_item {
+	struct xfs_log_item		attri_item;
+	atomic_t			attri_refcount;
+	int				attri_name_len;
+	int				attri_value_len;
+	void				*attri_name;
+	void				*attri_value;
+	struct xfs_attri_log_format	attri_format;
+};
+
+/*
+ * This is the "attr done" log item.  It is used to log the fact that some attrs
+ * earlier mentioned in an attri item have been freed.
+ */
+struct xfs_attrd_log_item {
+	struct xfs_attri_log_item	*attrd_attrip;
+	struct xfs_log_item		attrd_item;
+	struct xfs_attrd_log_format	attrd_format;
+};
+
+#endif	/* __XFS_ATTR_ITEM_H__ */
diff --git a/fs/xfs/xfs_attr_list.c b/fs/xfs/xfs_attr_list.c
index 25dcc98..81e167a 100644
--- a/fs/xfs/xfs_attr_list.c
+++ b/fs/xfs/xfs_attr_list.c
@@ -15,6 +15,7 @@
 #include "xfs_inode.h"
 #include "xfs_trans.h"
 #include "xfs_bmap.h"
+#include "xfs_da_btree.h"
 #include "xfs_attr.h"
 #include "xfs_attr_sf.h"
 #include "xfs_attr_leaf.h"
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 0f67943..ff635f9 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -15,6 +15,8 @@
 #include "xfs_iwalk.h"
 #include "xfs_itable.h"
 #include "xfs_error.h"
+#include "xfs_da_format.h"
+#include "xfs_da_btree.h"
 #include "xfs_attr.h"
 #include "xfs_bmap.h"
 #include "xfs_bmap_util.h"
diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c
index e650677..cb9f036 100644
--- a/fs/xfs/xfs_ioctl32.c
+++ b/fs/xfs/xfs_ioctl32.c
@@ -17,6 +17,8 @@
 #include "xfs_itable.h"
 #include "xfs_fsops.h"
 #include "xfs_rtalloc.h"
+#include "xfs_da_format.h"
+#include "xfs_da_btree.h"
 #include "xfs_attr.h"
 #include "xfs_ioctl.h"
 #include "xfs_ioctl32.h"
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 93c082d..6f15cad 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -13,6 +13,8 @@
 #include "xfs_inode.h"
 #include "xfs_acl.h"
 #include "xfs_quota.h"
+#include "xfs_da_format.h"
+#include "xfs_da_btree.h"
 #include "xfs_attr.h"
 #include "xfs_trans.h"
 #include "xfs_trace.h"
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 6ab467b..ef038f0 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -1776,6 +1776,8 @@ static const struct xlog_recover_item_ops *xlog_recover_item_ops[] = {
 	&xlog_cud_item_ops,
 	&xlog_bui_item_ops,
 	&xlog_bud_item_ops,
+	&xlog_attri_item_ops,
+	&xlog_attrd_item_ops,
 };
 
 static const struct xlog_recover_item_ops *
diff --git a/fs/xfs/xfs_ondisk.h b/fs/xfs/xfs_ondisk.h
index 2599192..758702b 100644
--- a/fs/xfs/xfs_ondisk.h
+++ b/fs/xfs/xfs_ondisk.h
@@ -132,6 +132,8 @@ xfs_check_ondisk_structs(void)
 	XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format,	56);
 	XFS_CHECK_STRUCT_SIZE(struct xfs_qoff_logformat,	20);
 	XFS_CHECK_STRUCT_SIZE(struct xfs_trans_header,		16);
+	XFS_CHECK_STRUCT_SIZE(struct xfs_attri_log_format,	40);
+	XFS_CHECK_STRUCT_SIZE(struct xfs_attrd_log_format,	16);
 
 	/*
 	 * The v5 superblock format extended several v4 header structures with
diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
index 0d050f8..66b334f 100644
--- a/fs/xfs/xfs_xattr.c
+++ b/fs/xfs/xfs_xattr.c
@@ -12,6 +12,7 @@
 #include "xfs_trans_resv.h"
 #include "xfs_mount.h"
 #include "xfs_inode.h"
+#include "xfs_da_btree.h"
 #include "xfs_attr.h"
 #include "xfs_acl.h"
 #include "xfs_da_btree.h"
-- 
2.7.4

[PATCH v21 06/13] xfs: Implement attr logging and replay

[Allison Henderson]

This patch adds the needed routines to create, log and replay attr
intents

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
---
 fs/xfs/libxfs/xfs_defer.c  |   1 +
 fs/xfs/libxfs/xfs_defer.h  |   1 +
 fs/xfs/libxfs/xfs_format.h |   4 +-
 fs/xfs/xfs_attr_item.c     | 394 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 399 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/libxfs/xfs_defer.c b/fs/xfs/libxfs/xfs_defer.c
index eff4a12..e9caff7 100644
--- a/fs/xfs/libxfs/xfs_defer.c
+++ b/fs/xfs/libxfs/xfs_defer.c
@@ -178,6 +178,7 @@ static const struct xfs_defer_op_type *defer_op_types[] = {
 	[XFS_DEFER_OPS_TYPE_RMAP]	= &xfs_rmap_update_defer_type,
 	[XFS_DEFER_OPS_TYPE_FREE]	= &xfs_extent_free_defer_type,
 	[XFS_DEFER_OPS_TYPE_AGFL_FREE]	= &xfs_agfl_free_defer_type,
+	[XFS_DEFER_OPS_TYPE_ATTR]	= &xfs_attr_defer_type,
 };
 
 static void
diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
index 0ed9dfa..72a5789 100644
--- a/fs/xfs/libxfs/xfs_defer.h
+++ b/fs/xfs/libxfs/xfs_defer.h
@@ -19,6 +19,7 @@ enum xfs_defer_ops_type {
 	XFS_DEFER_OPS_TYPE_RMAP,
 	XFS_DEFER_OPS_TYPE_FREE,
 	XFS_DEFER_OPS_TYPE_AGFL_FREE,
+	XFS_DEFER_OPS_TYPE_ATTR,
 	XFS_DEFER_OPS_TYPE_MAX,
 };
 
diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index 3a4da111..477e815 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -485,7 +485,9 @@ xfs_sb_has_incompat_feature(
 	return (sbp->sb_features_incompat & feature) != 0;
 }
 
-#define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
+#define XFS_SB_FEAT_INCOMPAT_LOG_DELATTR   (1 << 0)	/* Delayed Attributes */
+#define XFS_SB_FEAT_INCOMPAT_LOG_ALL \
+	(XFS_SB_FEAT_INCOMPAT_LOG_DELATTR)
 #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN	~XFS_SB_FEAT_INCOMPAT_LOG_ALL
 static inline bool
 xfs_sb_has_incompat_log_feature(
diff --git a/fs/xfs/xfs_attr_item.c b/fs/xfs/xfs_attr_item.c
index c9033e2..eda6ae3 100644
--- a/fs/xfs/xfs_attr_item.c
+++ b/fs/xfs/xfs_attr_item.c
@@ -282,6 +282,183 @@ xfs_attrd_item_release(
 	xfs_attrd_item_free(attrdp);
 }
 
+/*
+ * Performs one step of an attribute update intent and marks the attrd item
+ * dirty..  An attr operation may be a set or a remove.  Note that the
+ * transaction is marked dirty regardless of whether the operation succeeds or
+ * fails to support the ATTRI/ATTRD lifecycle rules.
+ */
+int
+xfs_trans_attr_finish_update(
+	struct xfs_delattr_context	*dac,
+	struct xfs_attrd_log_item	*attrdp,
+	struct xfs_buf			**leaf_bp,
+	uint32_t			op_flags)
+{
+	struct xfs_da_args		*args = dac->da_args;
+	int				error;
+
+	error = xfs_qm_dqattach_locked(args->dp, 0);
+	if (error)
+		return error;
+
+	switch (op_flags) {
+	case XFS_ATTR_OP_FLAGS_SET:
+		args->op_flags |= XFS_DA_OP_ADDNAME;
+		error = xfs_attr_set_iter(dac, leaf_bp);
+		break;
+	case XFS_ATTR_OP_FLAGS_REMOVE:
+		ASSERT(XFS_IFORK_Q(args->dp));
+		error = xfs_attr_remove_iter(dac);
+		break;
+	default:
+		error = -EFSCORRUPTED;
+		break;
+	}
+
+	/*
+	 * Mark the transaction dirty, even on error. This ensures the
+	 * transaction is aborted, which:
+	 *
+	 * 1.) releases the ATTRI and frees the ATTRD
+	 * 2.) shuts down the filesystem
+	 */
+	args->trans->t_flags |= XFS_TRANS_DIRTY;
+
+	/*
+	 * attr intent/done items are null when delayed attributes are disabled
+	 */
+	if (attrdp)
+		set_bit(XFS_LI_DIRTY, &attrdp->attrd_item.li_flags);
+
+	return error;
+}
+
+/* Log an attr to the intent item. */
+STATIC void
+xfs_attr_log_item(
+	struct xfs_trans		*tp,
+	struct xfs_attri_log_item	*attrip,
+	struct xfs_attr_item		*attr)
+{
+	struct xfs_attri_log_format	*attrp;
+
+	tp->t_flags |= XFS_TRANS_DIRTY;
+	set_bit(XFS_LI_DIRTY, &attrip->attri_item.li_flags);
+
+	/*
+	 * At this point the xfs_attr_item has been constructed, and we've
+	 * created the log intent. Fill in the attri log item and log format
+	 * structure with fields from this xfs_attr_item
+	 */
+	attrp = &attrip->attri_format;
+	attrp->alfi_ino = attr->xattri_dac.da_args->dp->i_ino;
+	attrp->alfi_op_flags = attr->xattri_op_flags;
+	attrp->alfi_value_len = attr->xattri_dac.da_args->valuelen;
+	attrp->alfi_name_len = attr->xattri_dac.da_args->namelen;
+	attrp->alfi_attr_flags = attr->xattri_dac.da_args->attr_filter;
+
+	attrip->attri_name = (void *)attr->xattri_dac.da_args->name;
+	attrip->attri_value = attr->xattri_dac.da_args->value;
+	attrip->attri_name_len = attr->xattri_dac.da_args->namelen;
+	attrip->attri_value_len = attr->xattri_dac.da_args->valuelen;
+}
+
+/* Get an ATTRI. */
+static struct xfs_log_item *
+xfs_attr_create_intent(
+	struct xfs_trans		*tp,
+	struct list_head		*items,
+	unsigned int			count,
+	bool				sort)
+{
+	struct xfs_mount		*mp = tp->t_mountp;
+	struct xfs_attri_log_item	*attrip;
+	struct xfs_attr_item		*attr;
+
+	ASSERT(count == 1);
+
+	if (!xfs_hasdelattr(mp))
+		return NULL;
+
+	xfs_sb_add_incompat_log_features(&mp->m_sb,
+					 XFS_SB_FEAT_INCOMPAT_LOG_DELATTR);
+
+	attrip = xfs_attri_init(mp, 0);
+	if (attrip == NULL)
+		return NULL;
+
+	xfs_trans_add_item(tp, &attrip->attri_item);
+	list_for_each_entry(attr, items, xattri_list)
+		xfs_attr_log_item(tp, attrip, attr);
+	return &attrip->attri_item;
+}
+
+/* Process an attr. */
+STATIC int
+xfs_attr_finish_item(
+	struct xfs_trans		*tp,
+	struct xfs_log_item		*done,
+	struct list_head		*item,
+	struct xfs_btree_cur		**state)
+{
+	struct xfs_attr_item		*attr;
+	struct xfs_attrd_log_item	*done_item = NULL;
+	int				error;
+	struct xfs_delattr_context	*dac;
+
+	attr = container_of(item, struct xfs_attr_item, xattri_list);
+	dac = &attr->xattri_dac;
+	if (done)
+		done_item = ATTRD_ITEM(done);
+
+	/*
+	 * Corner case that can happen during a recovery.  Because the first
+	 * iteration of a multi part delay op happens in xfs_attri_item_recover
+	 * to maintain the order of the log replay items.  But the new
+	 * transactions do not automatically rejoin during a recovery as they do
+	 * in a standard delay op, so we need to catch this here and rejoin the
+	 * leaf to the new transaction
+	 */
+	if (attr->xattri_dac.leaf_bp &&
+	    attr->xattri_dac.leaf_bp->b_transp != tp) {
+		xfs_trans_bjoin(tp, attr->xattri_dac.leaf_bp);
+		xfs_trans_bhold(tp, attr->xattri_dac.leaf_bp);
+	}
+
+	/*
+	 * Always reset trans after EAGAIN cycle
+	 * since the transaction is new
+	 */
+	dac->da_args->trans = tp;
+
+	error = xfs_trans_attr_finish_update(dac, done_item, &dac->leaf_bp,
+					     attr->xattri_op_flags);
+	if (error != -EAGAIN)
+		kmem_free(attr);
+
+	return error;
+}
+
+/* Abort all pending ATTRs. */
+STATIC void
+xfs_attr_abort_intent(
+	struct xfs_log_item		*intent)
+{
+	xfs_attri_release(ATTRI_ITEM(intent));
+}
+
+/* Cancel an attr */
+STATIC void
+xfs_attr_cancel_item(
+	struct list_head		*item)
+{
+	struct xfs_attr_item		*attr;
+
+	attr = container_of(item, struct xfs_attr_item, xattri_list);
+	kmem_free(attr);
+}
+
 STATIC xfs_lsn_t
 xfs_attri_item_committed(
 	struct xfs_log_item		*lip,
@@ -313,6 +490,30 @@ xfs_attri_item_match(
 	return ATTRI_ITEM(lip)->attri_format.alfi_id == intent_id;
 }
 
+/*
+ * This routine is called to allocate an "attr free done" log item.
+ */
+struct xfs_attrd_log_item *
+xfs_trans_get_attrd(struct xfs_trans		*tp,
+		  struct xfs_attri_log_item	*attrip)
+{
+	struct xfs_attrd_log_item		*attrdp;
+	uint					size;
+
+	ASSERT(tp != NULL);
+
+	size = sizeof(struct xfs_attrd_log_item);
+	attrdp = kmem_zalloc(size, 0);
+
+	xfs_log_item_init(tp->t_mountp, &attrdp->attrd_item, XFS_LI_ATTRD,
+			  &xfs_attrd_item_ops);
+	attrdp->attrd_attrip = attrip;
+	attrdp->attrd_format.alfd_alf_id = attrip->attri_format.alfi_id;
+
+	xfs_trans_add_item(tp, &attrdp->attrd_item);
+	return attrdp;
+}
+
 static const struct xfs_item_ops xfs_attrd_item_ops = {
 	.flags		= XFS_ITEM_RELEASE_WHEN_COMMITTED,
 	.iop_size	= xfs_attrd_item_size,
@@ -320,6 +521,29 @@ static const struct xfs_item_ops xfs_attrd_item_ops = {
 	.iop_release    = xfs_attrd_item_release,
 };
 
+
+/* Get an ATTRD so we can process all the attrs. */
+static struct xfs_log_item *
+xfs_attr_create_done(
+	struct xfs_trans		*tp,
+	struct xfs_log_item		*intent,
+	unsigned int			count)
+{
+	if (!intent)
+		return NULL;
+
+	return &xfs_trans_get_attrd(tp, ATTRI_ITEM(intent))->attrd_item;
+}
+
+const struct xfs_defer_op_type xfs_attr_defer_type = {
+	.max_items	= 1,
+	.create_intent	= xfs_attr_create_intent,
+	.abort_intent	= xfs_attr_abort_intent,
+	.create_done	= xfs_attr_create_done,
+	.finish_item	= xfs_attr_finish_item,
+	.cancel_item	= xfs_attr_cancel_item,
+};
+
 /* Is this recovered ATTRI ok? */
 static inline bool
 xfs_attri_validate(
@@ -346,13 +570,183 @@ xfs_attri_validate(
 	return xfs_hasdelattr(mp);
 }
 
+/*
+ * Process an attr intent item that was recovered from the log.  We need to
+ * delete the attr that it describes.
+ */
+STATIC int
+xfs_attri_item_recover(
+	struct xfs_log_item		*lip,
+	struct list_head		*capture_list)
+{
+	struct xfs_attri_log_item	*attrip = ATTRI_ITEM(lip);
+	struct xfs_attr_item		*new_attr;
+	struct xfs_mount		*mp = lip->li_mountp;
+	struct xfs_inode		*ip;
+	struct xfs_da_args		args;
+	struct xfs_da_args		*new_args;
+	struct xfs_trans_res		tres;
+	bool				rsvd;
+	struct xfs_attri_log_format	*attrp;
+	int				error;
+	int				total;
+	int				local;
+	struct xfs_attrd_log_item	*done_item = NULL;
+	struct xfs_attr_item		attr = {
+		.xattri_op_flags	= attrip->attri_format.alfi_op_flags,
+		.xattri_dac.da_args	= &args,
+	};
+
+	/*
+	 * First check the validity of the attr described by the ATTRI.  If any
+	 * are bad, then assume that all are bad and just toss the ATTRI.
+	 */
+	attrp = &attrip->attri_format;
+	if (!xfs_attri_validate(mp, attrip))
+		return -EFSCORRUPTED;
+
+	error = xfs_iget(mp, 0, attrp->alfi_ino, 0, 0, &ip);
+	if (error)
+		return error;
+
+	if (VFS_I(ip)->i_nlink == 0)
+		xfs_iflags_set(ip, XFS_IRECOVERY);
+
+	memset(&args, 0, sizeof(struct xfs_da_args));
+	args.dp = ip;
+	args.geo = mp->m_attr_geo;
+	args.op_flags = attrp->alfi_op_flags;
+	args.whichfork = XFS_ATTR_FORK;
+	args.name = attrip->attri_name;
+	args.namelen = attrp->alfi_name_len;
+	args.hashval = xfs_da_hashname(args.name, args.namelen);
+	args.attr_filter = attrp->alfi_attr_flags;
+
+	if (attrp->alfi_op_flags == XFS_ATTR_OP_FLAGS_SET) {
+		args.value = attrip->attri_value;
+		args.valuelen = attrp->alfi_value_len;
+		args.total = xfs_attr_calc_size(&args, &local);
+
+		tres.tr_logres = M_RES(mp)->tr_attrsetm.tr_logres +
+				 M_RES(mp)->tr_attrsetrt.tr_logres *
+					args.total;
+		tres.tr_logcount = XFS_ATTRSET_LOG_COUNT;
+		tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
+		total = args.total;
+	} else {
+		tres = M_RES(mp)->tr_attrrm;
+		total = XFS_ATTRRM_SPACE_RES(mp);
+	}
+	error = xfs_trans_alloc(mp, &tres, total, 0,
+				rsvd ? XFS_TRANS_RESERVE : 0, &args.trans);
+	if (error)
+		return error;
+
+	done_item = xfs_trans_get_attrd(args.trans, attrip);
+
+	xfs_ilock(ip, XFS_ILOCK_EXCL);
+	xfs_trans_ijoin(args.trans, ip, 0);
+
+	error = xfs_trans_attr_finish_update(&attr.xattri_dac, done_item,
+					     &attr.xattri_dac.leaf_bp,
+					     attrp->alfi_op_flags);
+	if (error == -EAGAIN) {
+		/*
+		 * There's more work to do, so make a new xfs_attr_item and add
+		 * it to this transaction.  We don't use xfs_attr_item_init here
+		 * because we need the info stored in the current attr to
+		 * continue with this multi-part operation.  So, alloc space
+		 * for it and the args and copy everything there.
+		 */
+		new_attr = kmem_zalloc(sizeof(struct xfs_attr_item) +
+				       sizeof(struct xfs_da_args), KM_NOFS);
+		new_args = (struct xfs_da_args *)((char *)new_attr +
+			   sizeof(struct xfs_attr_item));
+
+		memcpy(new_args, &args, sizeof(struct xfs_da_args));
+		memcpy(new_attr, &attr, sizeof(struct xfs_attr_item));
+
+		new_attr->xattri_dac.da_args = new_args;
+		memset(&new_attr->xattri_list, 0, sizeof(struct list_head));
+
+		xfs_defer_add(args.trans, XFS_DEFER_OPS_TYPE_ATTR,
+			      &new_attr->xattri_list);
+
+		/* Do not send -EAGAIN back to caller */
+		error = 0;
+	} else if (error) {
+		xfs_trans_cancel(args.trans);
+		goto out;
+	}
+
+	xfs_defer_ops_capture_and_commit(args.trans, ip, capture_list);
+
+out:
+	xfs_iunlock(ip, XFS_ILOCK_EXCL);
+	xfs_irele(ip);
+	return error;
+}
+
+/* Re-log an intent item to push the log tail forward. */
+static struct xfs_log_item *
+xfs_attri_item_relog(
+	struct xfs_log_item		*intent,
+	struct xfs_trans		*tp)
+{
+	struct xfs_attrd_log_item	*attrdp;
+	struct xfs_attri_log_item	*old_attrip;
+	struct xfs_attri_log_item	*new_attrip;
+	struct xfs_attri_log_format	*new_attrp;
+	struct xfs_attri_log_format	*old_attrp;
+	int				buffer_size;
+
+	old_attrip = ATTRI_ITEM(intent);
+	old_attrp = &old_attrip->attri_format;
+	buffer_size = old_attrp->alfi_value_len + old_attrp->alfi_name_len;
+
+	tp->t_flags |= XFS_TRANS_DIRTY;
+	attrdp = xfs_trans_get_attrd(tp, old_attrip);
+	set_bit(XFS_LI_DIRTY, &attrdp->attrd_item.li_flags);
+
+	new_attrip = xfs_attri_init(tp->t_mountp, buffer_size);
+	new_attrp = &new_attrip->attri_format;
+
+	new_attrp->alfi_ino = old_attrp->alfi_ino;
+	new_attrp->alfi_op_flags = old_attrp->alfi_op_flags;
+	new_attrp->alfi_value_len = old_attrp->alfi_value_len;
+	new_attrp->alfi_name_len = old_attrp->alfi_name_len;
+	new_attrp->alfi_attr_flags = old_attrp->alfi_attr_flags;
+
+	new_attrip->attri_name_len = old_attrip->attri_name_len;
+	new_attrip->attri_name = ((char *)new_attrip) +
+				 sizeof(struct xfs_attri_log_item);
+	memcpy(new_attrip->attri_name, old_attrip->attri_name,
+		new_attrip->attri_name_len);
+
+	new_attrip->attri_value_len = old_attrip->attri_value_len;
+	if (new_attrip->attri_value_len > 0) {
+		new_attrip->attri_value = new_attrip->attri_name +
+					  new_attrip->attri_name_len;
+
+		memcpy(new_attrip->attri_value, old_attrip->attri_value,
+		       new_attrip->attri_value_len);
+	}
+
+	xfs_trans_add_item(tp, &new_attrip->attri_item);
+	set_bit(XFS_LI_DIRTY, &new_attrip->attri_item.li_flags);
+
+	return &new_attrip->attri_item;
+}
+
 static const struct xfs_item_ops xfs_attri_item_ops = {
 	.iop_size	= xfs_attri_item_size,
 	.iop_format	= xfs_attri_item_format,
 	.iop_unpin	= xfs_attri_item_unpin,
 	.iop_committed	= xfs_attri_item_committed,
 	.iop_release    = xfs_attri_item_release,
+	.iop_recover	= xfs_attri_item_recover,
 	.iop_match	= xfs_attri_item_match,
+	.iop_relog	= xfs_attri_item_relog,
 };
 
 
-- 
2.7.4

[PATCH v21 07/13] RFC xfs: Skip flip flags for delayed attrs

[Allison Henderson]

This is a clean up patch that skips the flip flag logic for delayed attr
renames.  Since the log replay keeps the inode locked, we do not need to
worry about race windows with attr lookups.  So we can skip over
flipping the flag and the extra transaction roll for it

RFC: In the last review, folks asked for some performance analysis, so I
did a few perf captures with and with out this patch.  What I found was
that there wasnt very much difference at all between having the patch or
not having it.  Of the time we do spend in the affected code, the
percentage is small.  Most of the time we spend about %0.03 of the time
in this function, with or with out the patch.  Occasionally we get a
0.02%, though not often.  So I think this starts to challenge needing
this patch at all. This patch was requested some number of reviews ago,
be perhaps in light of the findings, it may no longer be of interest.

     0.03%     0.00%  fsstress  [xfs]               [k] xfs_attr_set_iter

Keep it or drop it?

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
 fs/xfs/libxfs/xfs_attr.c      | 51 +++++++++++++++++++++++++------------------
 fs/xfs/libxfs/xfs_attr_leaf.c |  3 ++-
 2 files changed, 32 insertions(+), 22 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index bdcdadc..034d08b 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -355,6 +355,7 @@ xfs_attr_set_iter(
 	struct xfs_inode		*dp = args->dp;
 	struct xfs_buf			*bp = NULL;
 	int				forkoff, error = 0;
+	struct xfs_mount		*mp = args->dp->i_mount;
 
 	/* State machine switch */
 	switch (dac->dela_state) {
@@ -476,16 +477,21 @@ xfs_attr_set_iter(
 		 * In a separate transaction, set the incomplete flag on the
 		 * "old" attr and clear the incomplete flag on the "new" attr.
 		 */
-		error = xfs_attr3_leaf_flipflags(args);
-		if (error)
-			return error;
-		/*
-		 * Commit the flag value change and start the next trans in
-		 * series.
-		 */
-		dac->dela_state = XFS_DAS_FLIP_LFLAG;
-		trace_xfs_attr_set_iter_return(dac->dela_state, args->dp);
-		return -EAGAIN;
+		if (!xfs_hasdelattr(mp)) {
+			error = xfs_attr3_leaf_flipflags(args);
+			if (error)
+				return error;
+			/*
+			 * Commit the flag value change and start the next trans
+			 * in series.
+			 */
+			dac->dela_state = XFS_DAS_FLIP_LFLAG;
+			trace_xfs_attr_set_iter_return(dac->dela_state,
+						       args->dp);
+			return -EAGAIN;
+		}
+
+		/* fallthrough */
 	case XFS_DAS_FLIP_LFLAG:
 		/*
 		 * Dismantle the "old" attribute/value pair by removing a
@@ -587,17 +593,21 @@ xfs_attr_set_iter(
 		 * In a separate transaction, set the incomplete flag on the
 		 * "old" attr and clear the incomplete flag on the "new" attr.
 		 */
-		error = xfs_attr3_leaf_flipflags(args);
-		if (error)
-			goto out;
-		/*
-		 * Commit the flag value change and start the next trans in
-		 * series
-		 */
-		dac->dela_state = XFS_DAS_FLIP_NFLAG;
-		trace_xfs_attr_set_iter_return(dac->dela_state, args->dp);
-		return -EAGAIN;
+		if (!xfs_hasdelattr(mp)) {
+			error = xfs_attr3_leaf_flipflags(args);
+			if (error)
+				goto out;
+			/*
+			 * Commit the flag value change and start the next trans
+			 * in series
+			 */
+			dac->dela_state = XFS_DAS_FLIP_NFLAG;
+			trace_xfs_attr_set_iter_return(dac->dela_state,
+						       args->dp);
+			return -EAGAIN;
+		}
 
+		/* fallthrough */
 	case XFS_DAS_FLIP_NFLAG:
 		/*
 		 * Dismantle the "old" attribute/value pair by removing a
@@ -1241,7 +1251,6 @@ xfs_attr_node_addname_clear_incomplete(
 	 * Re-find the "old" attribute entry after any split ops. The INCOMPLETE
 	 * flag means that we will find the "old" attr, not the "new" one.
 	 */
-	args->attr_filter |= XFS_ATTR_INCOMPLETE;
 	state = xfs_da_state_alloc(args);
 	state->inleaf = 0;
 	error = xfs_da3_node_lookup_int(state, &retval);
diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c
index b910bd2..a9116ee 100644
--- a/fs/xfs/libxfs/xfs_attr_leaf.c
+++ b/fs/xfs/libxfs/xfs_attr_leaf.c
@@ -1482,7 +1482,8 @@ xfs_attr3_leaf_add_work(
 	if (tmp)
 		entry->flags |= XFS_ATTR_LOCAL;
 	if (args->op_flags & XFS_DA_OP_RENAME) {
-		entry->flags |= XFS_ATTR_INCOMPLETE;
+		if (!xfs_hasdelattr(mp))
+			entry->flags |= XFS_ATTR_INCOMPLETE;
 		if ((args->blkno2 == args->blkno) &&
 		    (args->index2 <= args->index)) {
 			args->index2++;
-- 
2.7.4

[PATCH v21 08/13] xfs: Add xfs_attr_set_deferred and xfs_attr_remove_deferred

[Allison Henderson]

From: Allison Collins <allison.henderson@oracle.com>

These routines set up and queue a new deferred attribute operation.
These functions are meant to be called by any routine needing to
initiate a deferred attribute operation as opposed to the existing
inline operations. New helper function xfs_attr_item_init also added.

Finally enable delayed attributes in xfs_attr_set and xfs_attr_remove.

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
 fs/xfs/libxfs/xfs_attr.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++--
 fs/xfs/libxfs/xfs_attr.h |  2 ++
 2 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index 034d08b..becf9c0 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -25,6 +25,7 @@
 #include "xfs_trans_space.h"
 #include "xfs_trace.h"
 #include "xfs_attr_item.h"
+#include "xfs_attr.h"
 
 /*
  * xfs_attr.c
@@ -803,9 +804,10 @@ xfs_attr_set(
 		if (error != -ENOATTR && error != -EEXIST)
 			goto out_trans_cancel;
 
-		error = xfs_attr_set_args(args);
+		error = xfs_attr_set_deferred(args);
 		if (error)
 			goto out_trans_cancel;
+
 		/* shortform attribute has already been committed */
 		if (!args->trans)
 			goto out_unlock;
@@ -814,7 +816,7 @@ xfs_attr_set(
 		if (error != -EEXIST)
 			goto out_trans_cancel;
 
-		error = xfs_attr_remove_args(args);
+		error = xfs_attr_remove_deferred(args);
 		if (error)
 			goto out_trans_cancel;
 	}
@@ -844,6 +846,58 @@ xfs_attr_set(
 	goto out_unlock;
 }
 
+STATIC int
+xfs_attr_item_init(
+	struct xfs_da_args	*args,
+	unsigned int		op_flags,	/* op flag (set or remove) */
+	struct xfs_attr_item	**attr)		/* new xfs_attr_item */
+{
+
+	struct xfs_attr_item	*new;
+
+	new = kmem_zalloc(sizeof(struct xfs_attr_item), KM_NOFS);
+	new->xattri_op_flags = op_flags;
+	new->xattri_dac.da_args = args;
+
+	*attr = new;
+	return 0;
+}
+
+/* Sets an attribute for an inode as a deferred operation */
+int
+xfs_attr_set_deferred(
+	struct xfs_da_args	*args)
+{
+	struct xfs_attr_item	*new;
+	int			error = 0;
+
+	error = xfs_attr_item_init(args, XFS_ATTR_OP_FLAGS_SET, &new);
+	if (error)
+		return error;
+
+	xfs_defer_add(args->trans, XFS_DEFER_OPS_TYPE_ATTR, &new->xattri_list);
+
+	return 0;
+}
+
+/* Removes an attribute for an inode as a deferred operation */
+int
+xfs_attr_remove_deferred(
+	struct xfs_da_args	*args)
+{
+
+	struct xfs_attr_item	*new;
+	int			error;
+
+	error  = xfs_attr_item_init(args, XFS_ATTR_OP_FLAGS_REMOVE, &new);
+	if (error)
+		return error;
+
+	xfs_defer_add(args->trans, XFS_DEFER_OPS_TYPE_ATTR, &new->xattri_list);
+
+	return 0;
+}
+
 /*========================================================================
  * External routines when attribute list is inside the inode
  *========================================================================*/
diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
index 4ee5165..d638d12 100644
--- a/fs/xfs/libxfs/xfs_attr.h
+++ b/fs/xfs/libxfs/xfs_attr.h
@@ -527,5 +527,7 @@ bool xfs_attr_namecheck(const void *name, size_t length);
 void xfs_delattr_context_init(struct xfs_delattr_context *dac,
 			      struct xfs_da_args *args);
 int xfs_attr_calc_size(struct xfs_da_args *args, int *local);
+int xfs_attr_set_deferred(struct xfs_da_args *args);
+int xfs_attr_remove_deferred(struct xfs_da_args *args);
 
 #endif	/* __XFS_ATTR_H__ */
-- 
2.7.4

[PATCH v21 09/13] xfs: Remove unused xfs_attr_*_args

[Allison Henderson]

Remove xfs_attr_set_args, xfs_attr_remove_args, and xfs_attr_trans_roll.
These high level loops are now driven by the delayed operations code,
and can be removed.

Additionally collapse in the leaf_bp parameter of xfs_attr_set_iter
since we only have one caller that passes dac->leaf_bp

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
 fs/xfs/libxfs/xfs_attr.c        | 96 +++--------------------------------------
 fs/xfs/libxfs/xfs_attr.h        | 10 ++---
 fs/xfs/libxfs/xfs_attr_remote.c |  1 -
 fs/xfs/xfs_attr_item.c          |  6 +--
 4 files changed, 10 insertions(+), 103 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index becf9c0..cbf544f 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -243,67 +243,13 @@ xfs_attr_is_shortform(
 		ip->i_afp->if_nextents == 0);
 }
 
-/*
- * Checks to see if a delayed attribute transaction should be rolled.  If so,
- * transaction is finished or rolled as needed.
- */
-STATIC int
-xfs_attr_trans_roll(
-	struct xfs_delattr_context	*dac)
-{
-	struct xfs_da_args		*args = dac->da_args;
-	int				error;
-
-	if (dac->flags & XFS_DAC_DEFER_FINISH) {
-		/*
-		 * The caller wants us to finish all the deferred ops so that we
-		 * avoid pinning the log tail with a large number of deferred
-		 * ops.
-		 */
-		dac->flags &= ~XFS_DAC_DEFER_FINISH;
-		error = xfs_defer_finish(&args->trans);
-	} else
-		error = xfs_trans_roll_inode(&args->trans, args->dp);
-
-	return error;
-}
-
-/*
- * Set the attribute specified in @args.
- */
-int
-xfs_attr_set_args(
-	struct xfs_da_args		*args)
-{
-	struct xfs_buf			*leaf_bp = NULL;
-	int				error = 0;
-	struct xfs_delattr_context	dac = {
-		.da_args	= args,
-	};
-
-	do {
-		error = xfs_attr_set_iter(&dac, &leaf_bp);
-		if (error != -EAGAIN)
-			break;
-
-		error = xfs_attr_trans_roll(&dac);
-		if (error) {
-			if (leaf_bp)
-				xfs_trans_brelse(args->trans, leaf_bp);
-			return error;
-		}
-	} while (true);
-
-	return error;
-}
-
 STATIC int
 xfs_attr_sf_addname(
-	struct xfs_delattr_context	*dac,
-	struct xfs_buf			**leaf_bp)
+	struct xfs_delattr_context	*dac)
 {
 	struct xfs_da_args		*args = dac->da_args;
 	struct xfs_inode		*dp = args->dp;
+	struct xfs_buf			**leaf_bp = &dac->leaf_bp;
 	int				error = 0;
 
 	/*
@@ -336,7 +282,6 @@ xfs_attr_sf_addname(
 	 * add.
 	 */
 	trace_xfs_attr_sf_addname_return(XFS_DAS_UNINIT, args->dp);
-	dac->flags |= XFS_DAC_DEFER_FINISH;
 	return -EAGAIN;
 }
 
@@ -349,10 +294,10 @@ xfs_attr_sf_addname(
  */
 int
 xfs_attr_set_iter(
-	struct xfs_delattr_context	*dac,
-	struct xfs_buf			**leaf_bp)
+	struct xfs_delattr_context	*dac)
 {
 	struct xfs_da_args              *args = dac->da_args;
+	struct xfs_buf			**leaf_bp = &dac->leaf_bp;
 	struct xfs_inode		*dp = args->dp;
 	struct xfs_buf			*bp = NULL;
 	int				forkoff, error = 0;
@@ -369,7 +314,7 @@ xfs_attr_set_iter(
 		 * release the hold once we return with a clean transaction.
 		 */
 		if (xfs_attr_is_shortform(dp))
-			return xfs_attr_sf_addname(dac, leaf_bp);
+			return xfs_attr_sf_addname(dac);
 		if (*leaf_bp != NULL) {
 			xfs_trans_bhold_release(args->trans, *leaf_bp);
 			*leaf_bp = NULL;
@@ -395,7 +340,6 @@ xfs_attr_set_iter(
 				 * be a node, so we'll fall down into the node
 				 * handling code below
 				 */
-				dac->flags |= XFS_DAC_DEFER_FINISH;
 				trace_xfs_attr_set_iter_return(
 					dac->dela_state, args->dp);
 				return -EAGAIN;
@@ -684,32 +628,6 @@ xfs_has_attr(
 }
 
 /*
- * Remove the attribute specified in @args.
- */
-int
-xfs_attr_remove_args(
-	struct xfs_da_args	*args)
-{
-	int				error;
-	struct xfs_delattr_context	dac = {
-		.da_args	= args,
-	};
-
-	do {
-		error = xfs_attr_remove_iter(&dac);
-		if (error != -EAGAIN)
-			break;
-
-		error = xfs_attr_trans_roll(&dac);
-		if (error)
-			return error;
-
-	} while (true);
-
-	return error;
-}
-
-/*
  * Note: If args->value is NULL the attribute will be removed, just like the
  * Linux ->setattr API.
  */
@@ -1262,7 +1180,6 @@ xfs_attr_node_addname(
 			 * this. dela_state is still unset by this function at
 			 * this point.
 			 */
-			dac->flags |= XFS_DAC_DEFER_FINISH;
 			trace_xfs_attr_node_addname_return(
 					dac->dela_state, args->dp);
 			return -EAGAIN;
@@ -1277,7 +1194,6 @@ xfs_attr_node_addname(
 		error = xfs_da3_split(state);
 		if (error)
 			goto out;
-		dac->flags |= XFS_DAC_DEFER_FINISH;
 	} else {
 		/*
 		 * Addition succeeded, update Btree hashvals.
@@ -1528,7 +1444,6 @@ xfs_attr_remove_iter(
 			if (error)
 				goto out;
 			dac->dela_state = XFS_DAS_RM_NAME;
-			dac->flags |= XFS_DAC_DEFER_FINISH;
 			return -EAGAIN;
 		}
 
@@ -1555,7 +1470,6 @@ xfs_attr_remove_iter(
 			if (error)
 				goto out;
 
-			dac->flags |= XFS_DAC_DEFER_FINISH;
 			dac->dela_state = XFS_DAS_RM_SHRINK;
 			trace_xfs_attr_remove_iter_return(
 					dac->dela_state, args->dp);
diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
index d638d12..859dbef 100644
--- a/fs/xfs/libxfs/xfs_attr.h
+++ b/fs/xfs/libxfs/xfs_attr.h
@@ -457,9 +457,8 @@ enum xfs_delattr_state {
 /*
  * Defines for xfs_delattr_context.flags
  */
-#define XFS_DAC_DEFER_FINISH		0x01 /* finish the transaction */
-#define XFS_DAC_LEAF_ADDNAME_INIT	0x02 /* xfs_attr_leaf_addname init*/
-#define XFS_DAC_DELAYED_OP_INIT		0x04 /* delayed operations init*/
+#define XFS_DAC_LEAF_ADDNAME_INIT	0x01 /* xfs_attr_leaf_addname init*/
+#define XFS_DAC_DELAYED_OP_INIT		0x02 /* delayed operations init*/
 
 /*
  * Context used for keeping track of delayed attribute operations
@@ -517,11 +516,8 @@ bool xfs_attr_is_leaf(struct xfs_inode *ip);
 int xfs_attr_get_ilocked(struct xfs_da_args *args);
 int xfs_attr_get(struct xfs_da_args *args);
 int xfs_attr_set(struct xfs_da_args *args);
-int xfs_attr_set_args(struct xfs_da_args *args);
-int xfs_attr_set_iter(struct xfs_delattr_context *dac,
-		      struct xfs_buf **leaf_bp);
+int xfs_attr_set_iter(struct xfs_delattr_context *dac);
 int xfs_has_attr(struct xfs_da_args *args);
-int xfs_attr_remove_args(struct xfs_da_args *args);
 int xfs_attr_remove_iter(struct xfs_delattr_context *dac);
 bool xfs_attr_namecheck(const void *name, size_t length);
 void xfs_delattr_context_init(struct xfs_delattr_context *dac,
diff --git a/fs/xfs/libxfs/xfs_attr_remote.c b/fs/xfs/libxfs/xfs_attr_remote.c
index 1669043..e29c2b9 100644
--- a/fs/xfs/libxfs/xfs_attr_remote.c
+++ b/fs/xfs/libxfs/xfs_attr_remote.c
@@ -695,7 +695,6 @@ xfs_attr_rmtval_remove(
 	 * the parent
 	 */
 	if (!done) {
-		dac->flags |= XFS_DAC_DEFER_FINISH;
 		trace_xfs_attr_rmtval_remove_return(dac->dela_state, args->dp);
 		return -EAGAIN;
 	}
diff --git a/fs/xfs/xfs_attr_item.c b/fs/xfs/xfs_attr_item.c
index eda6ae3..a1ea055 100644
--- a/fs/xfs/xfs_attr_item.c
+++ b/fs/xfs/xfs_attr_item.c
@@ -292,7 +292,6 @@ int
 xfs_trans_attr_finish_update(
 	struct xfs_delattr_context	*dac,
 	struct xfs_attrd_log_item	*attrdp,
-	struct xfs_buf			**leaf_bp,
 	uint32_t			op_flags)
 {
 	struct xfs_da_args		*args = dac->da_args;
@@ -305,7 +304,7 @@ xfs_trans_attr_finish_update(
 	switch (op_flags) {
 	case XFS_ATTR_OP_FLAGS_SET:
 		args->op_flags |= XFS_DA_OP_ADDNAME;
-		error = xfs_attr_set_iter(dac, leaf_bp);
+		error = xfs_attr_set_iter(dac);
 		break;
 	case XFS_ATTR_OP_FLAGS_REMOVE:
 		ASSERT(XFS_IFORK_Q(args->dp));
@@ -432,7 +431,7 @@ xfs_attr_finish_item(
 	 */
 	dac->da_args->trans = tp;
 
-	error = xfs_trans_attr_finish_update(dac, done_item, &dac->leaf_bp,
+	error = xfs_trans_attr_finish_update(dac, done_item,
 					     attr->xattri_op_flags);
 	if (error != -EAGAIN)
 		kmem_free(attr);
@@ -648,7 +647,6 @@ xfs_attri_item_recover(
 	xfs_trans_ijoin(args.trans, ip, 0);
 
 	error = xfs_trans_attr_finish_update(&attr.xattri_dac, done_item,
-					     &attr.xattri_dac.leaf_bp,
 					     attrp->alfi_op_flags);
 	if (error == -EAGAIN) {
 		/*
-- 
2.7.4

[PATCH v21 10/13] xfs: Add delayed attributes error tag

[Allison Henderson]

This patch adds an error tag that we can use to test delayed attribute
recovery and replay

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 fs/xfs/libxfs/xfs_errortag.h | 4 +++-
 fs/xfs/xfs_attr_item.c       | 7 +++++++
 fs/xfs/xfs_error.c           | 3 +++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/libxfs/xfs_errortag.h b/fs/xfs/libxfs/xfs_errortag.h
index a23a52e..46f359c 100644
--- a/fs/xfs/libxfs/xfs_errortag.h
+++ b/fs/xfs/libxfs/xfs_errortag.h
@@ -59,7 +59,8 @@
 #define XFS_ERRTAG_REDUCE_MAX_IEXTENTS			36
 #define XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT		37
 #define XFS_ERRTAG_AG_RESV_FAIL				38
-#define XFS_ERRTAG_MAX					39
+#define XFS_ERRTAG_DELAYED_ATTR				39
+#define XFS_ERRTAG_MAX					40
 
 /*
  * Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
@@ -103,5 +104,6 @@
 #define XFS_RANDOM_REDUCE_MAX_IEXTENTS			1
 #define XFS_RANDOM_BMAP_ALLOC_MINLEN_EXTENT		1
 #define XFS_RANDOM_AG_RESV_FAIL				1
+#define XFS_RANDOM_DELAYED_ATTR				1
 
 #endif /* __XFS_ERRORTAG_H_ */
diff --git a/fs/xfs/xfs_attr_item.c b/fs/xfs/xfs_attr_item.c
index a1ea055..e688ac9 100644
--- a/fs/xfs/xfs_attr_item.c
+++ b/fs/xfs/xfs_attr_item.c
@@ -38,6 +38,7 @@
 #include "xfs_inode.h"
 #include "xfs_quota.h"
 #include "xfs_trans_space.h"
+#include "xfs_errortag.h"
 #include "xfs_error.h"
 #include "xfs_log_priv.h"
 #include "xfs_log_recover.h"
@@ -301,6 +302,11 @@ xfs_trans_attr_finish_update(
 	if (error)
 		return error;
 
+	if (XFS_TEST_ERROR(false, args->dp->i_mount, XFS_ERRTAG_DELAYED_ATTR)) {
+		error = -EIO;
+		goto out;
+	}
+
 	switch (op_flags) {
 	case XFS_ATTR_OP_FLAGS_SET:
 		args->op_flags |= XFS_DA_OP_ADDNAME;
@@ -315,6 +321,7 @@ xfs_trans_attr_finish_update(
 		break;
 	}
 
+out:
 	/*
 	 * Mark the transaction dirty, even on error. This ensures the
 	 * transaction is aborted, which:
diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c
index ce3bc1b..eca5e34 100644
--- a/fs/xfs/xfs_error.c
+++ b/fs/xfs/xfs_error.c
@@ -57,6 +57,7 @@ static unsigned int xfs_errortag_random_default[] = {
 	XFS_RANDOM_REDUCE_MAX_IEXTENTS,
 	XFS_RANDOM_BMAP_ALLOC_MINLEN_EXTENT,
 	XFS_RANDOM_AG_RESV_FAIL,
+	XFS_RANDOM_DELAYED_ATTR,
 };
 
 struct xfs_errortag_attr {
@@ -170,6 +171,7 @@ XFS_ERRORTAG_ATTR_RW(buf_ioerror,	XFS_ERRTAG_BUF_IOERROR);
 XFS_ERRORTAG_ATTR_RW(reduce_max_iextents,	XFS_ERRTAG_REDUCE_MAX_IEXTENTS);
 XFS_ERRORTAG_ATTR_RW(bmap_alloc_minlen_extent,	XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT);
 XFS_ERRORTAG_ATTR_RW(ag_resv_fail, XFS_ERRTAG_AG_RESV_FAIL);
+XFS_ERRORTAG_ATTR_RW(delayed_attr,	XFS_ERRTAG_DELAYED_ATTR);
 
 static struct attribute *xfs_errortag_attrs[] = {
 	XFS_ERRORTAG_ATTR_LIST(noerror),
@@ -211,6 +213,7 @@ static struct attribute *xfs_errortag_attrs[] = {
 	XFS_ERRORTAG_ATTR_LIST(reduce_max_iextents),
 	XFS_ERRORTAG_ATTR_LIST(bmap_alloc_minlen_extent),
 	XFS_ERRORTAG_ATTR_LIST(ag_resv_fail),
+	XFS_ERRORTAG_ATTR_LIST(delayed_attr),
 	NULL,
 };
 
-- 
2.7.4

[PATCH v21 11/13] xfs: Add delattr mount option

[Allison Henderson]

This patch adds a mount option to enable delayed attributes. Eventually
this can be removed when delayed attrs becomes permanent.

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
---
 fs/xfs/libxfs/xfs_attr.h | 2 +-
 fs/xfs/xfs_mount.h       | 1 +
 fs/xfs/xfs_super.c       | 6 +++++-
 fs/xfs/xfs_xattr.c       | 2 ++
 4 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
index 859dbef..5141958 100644
--- a/fs/xfs/libxfs/xfs_attr.h
+++ b/fs/xfs/libxfs/xfs_attr.h
@@ -30,7 +30,7 @@ struct xfs_attr_list_context;
 
 static inline bool xfs_hasdelattr(struct xfs_mount *mp)
 {
-	return false;
+	return mp->m_flags & XFS_MOUNT_DELATTR;
 }
 
 /*
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 66a47f5..2945868 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -257,6 +257,7 @@ typedef struct xfs_mount {
 #define XFS_MOUNT_NOATTR2	(1ULL << 25)	/* disable use of attr2 format */
 #define XFS_MOUNT_DAX_ALWAYS	(1ULL << 26)
 #define XFS_MOUNT_DAX_NEVER	(1ULL << 27)
+#define XFS_MOUNT_DELATTR	(1ULL << 28)	/* enable delayed attributes */
 
 /*
  * Max and min values for mount-option defined I/O
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index c30b077..1a7edae 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -94,7 +94,7 @@ enum {
 	Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
 	Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
 	Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
-	Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
+	Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum, Opt_delattr
 };
 
 static const struct fs_parameter_spec xfs_fs_parameters[] = {
@@ -139,6 +139,7 @@ static const struct fs_parameter_spec xfs_fs_parameters[] = {
 	fsparam_flag("nodiscard",	Opt_nodiscard),
 	fsparam_flag("dax",		Opt_dax),
 	fsparam_enum("dax",		Opt_dax_enum, dax_param_enums),
+	fsparam_flag("delattr",		Opt_delattr),
 	{}
 };
 
@@ -1277,6 +1278,9 @@ xfs_fs_parse_param(
 		xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
 		return 0;
 #endif
+	case Opt_delattr:
+		parsing_mp->m_flags |= XFS_MOUNT_DELATTR;
+		return 0;
 	/* Following mount options will be removed in September 2025 */
 	case Opt_ikeep:
 		xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_IKEEP, true);
diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
index 66b334f..7335423 100644
--- a/fs/xfs/xfs_xattr.c
+++ b/fs/xfs/xfs_xattr.c
@@ -8,6 +8,8 @@
 #include "xfs_shared.h"
 #include "xfs_format.h"
 #include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
 #include "xfs_da_format.h"
 #include "xfs_trans_resv.h"
 #include "xfs_mount.h"
-- 
2.7.4

[PATCH v21 12/13] xfs: Merge xfs_delattr_context into xfs_attr_item

[Allison Henderson]

This is a clean up patch that merges xfs_delattr_context into
xfs_attr_item.  Now that the refactoring is complete and the delayed
operation infrastructure is in place, we can combine these to eliminate
the extra struct

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 fs/xfs/libxfs/xfs_attr.c        | 142 ++++++++++++++++++++--------------------
 fs/xfs/libxfs/xfs_attr.h        |  40 +++++------
 fs/xfs/libxfs/xfs_attr_remote.c |  36 +++++-----
 fs/xfs/libxfs/xfs_attr_remote.h |   6 +-
 fs/xfs/xfs_attr_item.c          |  45 ++++++-------
 5 files changed, 131 insertions(+), 138 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index cbf544f..cb7e689 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -55,10 +55,9 @@ STATIC int xfs_attr_leaf_try_add(struct xfs_da_args *args, struct xfs_buf *bp);
  */
 STATIC int xfs_attr_node_get(xfs_da_args_t *args);
 STATIC void xfs_attr_restore_rmt_blk(struct xfs_da_args *args);
-STATIC int xfs_attr_node_addname(struct xfs_delattr_context *dac);
-STATIC int xfs_attr_node_addname_find_attr(struct xfs_delattr_context *dac);
-STATIC int xfs_attr_node_addname_clear_incomplete(
-				struct xfs_delattr_context *dac);
+STATIC int xfs_attr_node_addname(struct xfs_attr_item *attr);
+STATIC int xfs_attr_node_addname_find_attr(struct xfs_attr_item *attr);
+STATIC int xfs_attr_node_addname_clear_incomplete(struct xfs_attr_item *attr);
 STATIC int xfs_attr_node_hasname(xfs_da_args_t *args,
 				 struct xfs_da_state **state);
 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
@@ -245,11 +244,11 @@ xfs_attr_is_shortform(
 
 STATIC int
 xfs_attr_sf_addname(
-	struct xfs_delattr_context	*dac)
+	struct xfs_attr_item		*attr)
 {
-	struct xfs_da_args		*args = dac->da_args;
+	struct xfs_da_args		*args = attr->xattri_da_args;
 	struct xfs_inode		*dp = args->dp;
-	struct xfs_buf			**leaf_bp = &dac->leaf_bp;
+	struct xfs_buf			**leaf_bp = &attr->xattri_leaf_bp;
 	int				error = 0;
 
 	/*
@@ -294,17 +293,17 @@ xfs_attr_sf_addname(
  */
 int
 xfs_attr_set_iter(
-	struct xfs_delattr_context	*dac)
+	struct xfs_attr_item		*attr)
 {
-	struct xfs_da_args              *args = dac->da_args;
-	struct xfs_buf			**leaf_bp = &dac->leaf_bp;
+	struct xfs_da_args              *args = attr->xattri_da_args;
+	struct xfs_buf			**leaf_bp = &attr->xattri_leaf_bp;
 	struct xfs_inode		*dp = args->dp;
 	struct xfs_buf			*bp = NULL;
 	int				forkoff, error = 0;
 	struct xfs_mount		*mp = args->dp->i_mount;
 
 	/* State machine switch */
-	switch (dac->dela_state) {
+	switch (attr->xattri_dela_state) {
 	case XFS_DAS_UNINIT:
 		/*
 		 * If the fork is shortform, attempt to add the attr. If there
@@ -314,7 +313,7 @@ xfs_attr_set_iter(
 		 * release the hold once we return with a clean transaction.
 		 */
 		if (xfs_attr_is_shortform(dp))
-			return xfs_attr_sf_addname(dac);
+			return xfs_attr_sf_addname(attr);
 		if (*leaf_bp != NULL) {
 			xfs_trans_bhold_release(args->trans, *leaf_bp);
 			*leaf_bp = NULL;
@@ -341,19 +340,19 @@ xfs_attr_set_iter(
 				 * handling code below
 				 */
 				trace_xfs_attr_set_iter_return(
-					dac->dela_state, args->dp);
+					attr->xattri_dela_state, args->dp);
 				return -EAGAIN;
 			} else if (error) {
 				return error;
 			}
 
-			dac->dela_state = XFS_DAS_FOUND_LBLK;
+			attr->xattri_dela_state = XFS_DAS_FOUND_LBLK;
 		} else {
-			error = xfs_attr_node_addname_find_attr(dac);
+			error = xfs_attr_node_addname_find_attr(attr);
 			if (error)
 				return error;
 
-			error = xfs_attr_node_addname(dac);
+			error = xfs_attr_node_addname(attr);
 			if (error)
 				return error;
 
@@ -364,9 +363,10 @@ xfs_attr_set_iter(
 			if (!args->rmtblkno && !args->rmtblkno2)
 				return error;
 
-			dac->dela_state = XFS_DAS_FOUND_NBLK;
+			attr->xattri_dela_state = XFS_DAS_FOUND_NBLK;
 		}
-		trace_xfs_attr_set_iter_return(dac->dela_state,	args->dp);
+		trace_xfs_attr_set_iter_return(attr->xattri_dela_state,
+					       args->dp);
 		return -EAGAIN;
 	case XFS_DAS_FOUND_LBLK:
 		/*
@@ -377,10 +377,10 @@ xfs_attr_set_iter(
 		 */
 
 		/* Open coded xfs_attr_rmtval_set without trans handling */
-		if ((dac->flags & XFS_DAC_LEAF_ADDNAME_INIT) == 0) {
-			dac->flags |= XFS_DAC_LEAF_ADDNAME_INIT;
+		if ((attr->xattri_flags & XFS_DAC_LEAF_ADDNAME_INIT) == 0) {
+			attr->xattri_flags |= XFS_DAC_LEAF_ADDNAME_INIT;
 			if (args->rmtblkno > 0) {
-				error = xfs_attr_rmtval_find_space(dac);
+				error = xfs_attr_rmtval_find_space(attr);
 				if (error)
 					return error;
 			}
@@ -390,11 +390,11 @@ xfs_attr_set_iter(
 		 * Repeat allocating remote blocks for the attr value until
 		 * blkcnt drops to zero.
 		 */
-		if (dac->blkcnt > 0) {
-			error = xfs_attr_rmtval_set_blk(dac);
+		if (attr->xattri_blkcnt > 0) {
+			error = xfs_attr_rmtval_set_blk(attr);
 			if (error)
 				return error;
-			trace_xfs_attr_set_iter_return(dac->dela_state,
+			trace_xfs_attr_set_iter_return(attr->xattri_dela_state,
 						       args->dp);
 			return -EAGAIN;
 		}
@@ -430,8 +430,8 @@ xfs_attr_set_iter(
 			 * Commit the flag value change and start the next trans
 			 * in series.
 			 */
-			dac->dela_state = XFS_DAS_FLIP_LFLAG;
-			trace_xfs_attr_set_iter_return(dac->dela_state,
+			attr->xattri_dela_state = XFS_DAS_FLIP_LFLAG;
+			trace_xfs_attr_set_iter_return(attr->xattri_dela_state,
 						       args->dp);
 			return -EAGAIN;
 		}
@@ -450,16 +450,16 @@ xfs_attr_set_iter(
 		/* fallthrough */
 	case XFS_DAS_RM_LBLK:
 		/* Set state in case xfs_attr_rmtval_remove returns -EAGAIN */
-		dac->dela_state = XFS_DAS_RM_LBLK;
+		attr->xattri_dela_state = XFS_DAS_RM_LBLK;
 		if (args->rmtblkno) {
-			error = xfs_attr_rmtval_remove(dac);
+			error = xfs_attr_rmtval_remove(attr);
 			if (error == -EAGAIN)
 				trace_xfs_attr_set_iter_return(
-					dac->dela_state, args->dp);
+					attr->xattri_dela_state, args->dp);
 			if (error)
 				return error;
 
-			dac->dela_state = XFS_DAS_RD_LEAF;
+			attr->xattri_dela_state = XFS_DAS_RD_LEAF;
 			return -EAGAIN;
 		}
 
@@ -490,7 +490,7 @@ xfs_attr_set_iter(
 		 * state.
 		 */
 		if (args->rmtblkno > 0) {
-			error = xfs_attr_rmtval_find_space(dac);
+			error = xfs_attr_rmtval_find_space(attr);
 			if (error)
 				return error;
 		}
@@ -503,14 +503,14 @@ xfs_attr_set_iter(
 		 * after we create the attribute so that we don't overflow the
 		 * maximum size of a transaction and/or hit a deadlock.
 		 */
-		dac->dela_state = XFS_DAS_ALLOC_NODE;
+		attr->xattri_dela_state = XFS_DAS_ALLOC_NODE;
 		if (args->rmtblkno > 0) {
-			if (dac->blkcnt > 0) {
-				error = xfs_attr_rmtval_set_blk(dac);
+			if (attr->xattri_blkcnt > 0) {
+				error = xfs_attr_rmtval_set_blk(attr);
 				if (error)
 					return error;
 				trace_xfs_attr_set_iter_return(
-					dac->dela_state, args->dp);
+					attr->xattri_dela_state, args->dp);
 				return -EAGAIN;
 			}
 
@@ -546,8 +546,8 @@ xfs_attr_set_iter(
 			 * Commit the flag value change and start the next trans
 			 * in series
 			 */
-			dac->dela_state = XFS_DAS_FLIP_NFLAG;
-			trace_xfs_attr_set_iter_return(dac->dela_state,
+			attr->xattri_dela_state = XFS_DAS_FLIP_NFLAG;
+			trace_xfs_attr_set_iter_return(attr->xattri_dela_state,
 						       args->dp);
 			return -EAGAIN;
 		}
@@ -567,17 +567,17 @@ xfs_attr_set_iter(
 		/* fallthrough */
 	case XFS_DAS_RM_NBLK:
 		/* Set state in case xfs_attr_rmtval_remove returns -EAGAIN */
-		dac->dela_state = XFS_DAS_RM_NBLK;
+		attr->xattri_dela_state = XFS_DAS_RM_NBLK;
 		if (args->rmtblkno) {
-			error = xfs_attr_rmtval_remove(dac);
+			error = xfs_attr_rmtval_remove(attr);
 			if (error == -EAGAIN)
 				trace_xfs_attr_set_iter_return(
-					dac->dela_state, args->dp);
+					attr->xattri_dela_state, args->dp);
 
 			if (error)
 				return error;
 
-			dac->dela_state = XFS_DAS_CLR_FLAG;
+			attr->xattri_dela_state = XFS_DAS_CLR_FLAG;
 			return -EAGAIN;
 		}
 
@@ -587,7 +587,7 @@ xfs_attr_set_iter(
 		 * The last state for node format. Look up the old attr and
 		 * remove it.
 		 */
-		error = xfs_attr_node_addname_clear_incomplete(dac);
+		error = xfs_attr_node_addname_clear_incomplete(attr);
 		break;
 	default:
 		ASSERT(0);
@@ -775,7 +775,7 @@ xfs_attr_item_init(
 
 	new = kmem_zalloc(sizeof(struct xfs_attr_item), KM_NOFS);
 	new->xattri_op_flags = op_flags;
-	new->xattri_dac.da_args = args;
+	new->xattri_da_args = args;
 
 	*attr = new;
 	return 0;
@@ -1088,16 +1088,16 @@ xfs_attr_node_hasname(
 
 STATIC int
 xfs_attr_node_addname_find_attr(
-	struct xfs_delattr_context	*dac)
+	 struct xfs_attr_item		*attr)
 {
-	struct xfs_da_args		*args = dac->da_args;
+	struct xfs_da_args		*args = attr->xattri_da_args;
 	int				retval;
 
 	/*
 	 * Search to see if name already exists, and get back a pointer
 	 * to where it should go.
 	 */
-	retval = xfs_attr_node_hasname(args, &dac->da_state);
+	retval = xfs_attr_node_hasname(args, &attr->xattri_da_state);
 	if (retval != -ENOATTR && retval != -EEXIST)
 		return retval;
 
@@ -1125,8 +1125,8 @@ xfs_attr_node_addname_find_attr(
 
 	return 0;
 error:
-	if (dac->da_state)
-		xfs_da_state_free(dac->da_state);
+	if (attr->xattri_da_state)
+		xfs_da_state_free(attr->xattri_da_state);
 	return retval;
 }
 
@@ -1147,10 +1147,10 @@ xfs_attr_node_addname_find_attr(
  */
 STATIC int
 xfs_attr_node_addname(
-	struct xfs_delattr_context	*dac)
+	struct xfs_attr_item		*attr)
 {
-	struct xfs_da_args		*args = dac->da_args;
-	struct xfs_da_state		*state = dac->da_state;
+	struct xfs_da_args		*args = attr->xattri_da_args;
+	struct xfs_da_state		*state = attr->xattri_da_state;
 	struct xfs_da_state_blk		*blk;
 	int				error;
 
@@ -1181,7 +1181,7 @@ xfs_attr_node_addname(
 			 * this point.
 			 */
 			trace_xfs_attr_node_addname_return(
-					dac->dela_state, args->dp);
+					attr->xattri_dela_state, args->dp);
 			return -EAGAIN;
 		}
 
@@ -1210,9 +1210,9 @@ xfs_attr_node_addname(
 
 STATIC int
 xfs_attr_node_addname_clear_incomplete(
-	struct xfs_delattr_context	*dac)
+	struct xfs_attr_item		*attr)
 {
-	struct xfs_da_args		*args = dac->da_args;
+	struct xfs_da_args		*args = attr->xattri_da_args;
 	struct xfs_da_state		*state = NULL;
 	int				retval = 0;
 	int				error = 0;
@@ -1313,10 +1313,10 @@ xfs_attr_leaf_mark_incomplete(
  */
 STATIC
 int xfs_attr_node_removename_setup(
-	struct xfs_delattr_context	*dac)
+	struct xfs_attr_item		*attr)
 {
-	struct xfs_da_args		*args = dac->da_args;
-	struct xfs_da_state		**state = &dac->da_state;
+	struct xfs_da_args		*args = attr->xattri_da_args;
+	struct xfs_da_state		**state = &attr->xattri_da_state;
 	int				error;
 
 	error = xfs_attr_node_hasname(args, state);
@@ -1375,16 +1375,16 @@ xfs_attr_node_removename(
  */
 int
 xfs_attr_remove_iter(
-	struct xfs_delattr_context	*dac)
+	struct xfs_attr_item		*attr)
 {
-	struct xfs_da_args		*args = dac->da_args;
-	struct xfs_da_state		*state = dac->da_state;
+	struct xfs_da_args		*args = attr->xattri_da_args;
+	struct xfs_da_state		*state = attr->xattri_da_state;
 	int				retval, error;
 	struct xfs_inode		*dp = args->dp;
 
 	trace_xfs_attr_node_removename(args);
 
-	switch (dac->dela_state) {
+	switch (attr->xattri_dela_state) {
 	case XFS_DAS_UNINIT:
 		if (!xfs_inode_hasattr(dp))
 			return -ENOATTR;
@@ -1403,16 +1403,16 @@ xfs_attr_remove_iter(
 		 * Node format may require transaction rolls. Set up the
 		 * state context and fall into the state machine.
 		 */
-		if (!dac->da_state) {
-			error = xfs_attr_node_removename_setup(dac);
+		if (!attr->xattri_da_state) {
+			error = xfs_attr_node_removename_setup(attr);
 			if (error)
 				return error;
-			state = dac->da_state;
+			state = attr->xattri_da_state;
 		}
 
 		/* fallthrough */
 	case XFS_DAS_RMTBLK:
-		dac->dela_state = XFS_DAS_RMTBLK;
+		attr->xattri_dela_state = XFS_DAS_RMTBLK;
 
 		/*
 		 * If there is an out-of-line value, de-allocate the blocks.
@@ -1425,10 +1425,10 @@ xfs_attr_remove_iter(
 			 * May return -EAGAIN. Roll and repeat until all remote
 			 * blocks are removed.
 			 */
-			error = xfs_attr_rmtval_remove(dac);
+			error = xfs_attr_rmtval_remove(attr);
 			if (error == -EAGAIN) {
 				trace_xfs_attr_remove_iter_return(
-						dac->dela_state, args->dp);
+					attr->xattri_dela_state, args->dp);
 				return error;
 			} else if (error) {
 				goto out;
@@ -1443,7 +1443,7 @@ xfs_attr_remove_iter(
 			error = xfs_attr_refillstate(state);
 			if (error)
 				goto out;
-			dac->dela_state = XFS_DAS_RM_NAME;
+			attr->xattri_dela_state = XFS_DAS_RM_NAME;
 			return -EAGAIN;
 		}
 
@@ -1453,7 +1453,7 @@ xfs_attr_remove_iter(
 		 * If we came here fresh from a transaction roll, reattach all
 		 * the buffers to the current transaction.
 		 */
-		if (dac->dela_state == XFS_DAS_RM_NAME) {
+		if (attr->xattri_dela_state == XFS_DAS_RM_NAME) {
 			error = xfs_attr_refillstate(state);
 			if (error)
 				goto out;
@@ -1470,9 +1470,9 @@ xfs_attr_remove_iter(
 			if (error)
 				goto out;
 
-			dac->dela_state = XFS_DAS_RM_SHRINK;
+			attr->xattri_dela_state = XFS_DAS_RM_SHRINK;
 			trace_xfs_attr_remove_iter_return(
-					dac->dela_state, args->dp);
+					attr->xattri_dela_state, args->dp);
 			return -EAGAIN;
 		}
 
diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
index 5141958..5eef63e 100644
--- a/fs/xfs/libxfs/xfs_attr.h
+++ b/fs/xfs/libxfs/xfs_attr.h
@@ -430,7 +430,7 @@ struct xfs_attr_list_context {
  */
 
 /*
- * Enum values for xfs_delattr_context.da_state
+ * Enum values for xfs_attr_item.xattri_da_state
  *
  * These values are used by delayed attribute operations to keep track  of where
  * they were before they returned -EAGAIN.  A return code of -EAGAIN signals the
@@ -455,7 +455,7 @@ enum xfs_delattr_state {
 };
 
 /*
- * Defines for xfs_delattr_context.flags
+ * Defines for xfs_attr_item.xattri_flags
  */
 #define XFS_DAC_LEAF_ADDNAME_INIT	0x01 /* xfs_attr_leaf_addname init*/
 #define XFS_DAC_DELAYED_OP_INIT		0x02 /* delayed operations init*/
@@ -463,32 +463,25 @@ enum xfs_delattr_state {
 /*
  * Context used for keeping track of delayed attribute operations
  */
-struct xfs_delattr_context {
-	struct xfs_da_args      *da_args;
+struct xfs_attr_item {
+	struct xfs_da_args		*xattri_da_args;
 
 	/*
 	 * Used by xfs_attr_set to hold a leaf buffer across a transaction roll
 	 */
-	struct xfs_buf		*leaf_bp;
+	struct xfs_buf			*xattri_leaf_bp;
 
 	/* Used in xfs_attr_rmtval_set_blk to roll through allocating blocks */
-	struct xfs_bmbt_irec	map;
-	xfs_dablk_t		lblkno;
-	int			blkcnt;
+	struct xfs_bmbt_irec		xattri_map;
+	xfs_dablk_t			xattri_lblkno;
+	int				xattri_blkcnt;
 
 	/* Used in xfs_attr_node_removename to roll through removing blocks */
-	struct xfs_da_state     *da_state;
+	struct xfs_da_state		*xattri_da_state;
 
 	/* Used to keep track of current state of delayed operation */
-	unsigned int            flags;
-	enum xfs_delattr_state  dela_state;
-};
-
-/*
- * List of attrs to commit later.
- */
-struct xfs_attr_item {
-	struct xfs_delattr_context	xattri_dac;
+	unsigned int			xattri_flags;
+	enum xfs_delattr_state		xattri_dela_state;
 
 	/*
 	 * Indicates if the attr operation is a set or a remove
@@ -496,7 +489,10 @@ struct xfs_attr_item {
 	 */
 	uint32_t			xattri_op_flags;
 
-	/* used to log this item to an intent */
+	/*
+	 * used to log this item to an intent containing a list of attrs to
+	 * commit later
+	 */
 	struct list_head		xattri_list;
 };
 
@@ -516,12 +512,10 @@ bool xfs_attr_is_leaf(struct xfs_inode *ip);
 int xfs_attr_get_ilocked(struct xfs_da_args *args);
 int xfs_attr_get(struct xfs_da_args *args);
 int xfs_attr_set(struct xfs_da_args *args);
-int xfs_attr_set_iter(struct xfs_delattr_context *dac);
+int xfs_attr_set_iter(struct xfs_attr_item *attr);
 int xfs_has_attr(struct xfs_da_args *args);
-int xfs_attr_remove_iter(struct xfs_delattr_context *dac);
+int xfs_attr_remove_iter(struct xfs_attr_item *attr);
 bool xfs_attr_namecheck(const void *name, size_t length);
-void xfs_delattr_context_init(struct xfs_delattr_context *dac,
-			      struct xfs_da_args *args);
 int xfs_attr_calc_size(struct xfs_da_args *args, int *local);
 int xfs_attr_set_deferred(struct xfs_da_args *args);
 int xfs_attr_remove_deferred(struct xfs_da_args *args);
diff --git a/fs/xfs/libxfs/xfs_attr_remote.c b/fs/xfs/libxfs/xfs_attr_remote.c
index e29c2b9..db5f004 100644
--- a/fs/xfs/libxfs/xfs_attr_remote.c
+++ b/fs/xfs/libxfs/xfs_attr_remote.c
@@ -568,14 +568,14 @@ xfs_attr_rmtval_stale(
  */
 int
 xfs_attr_rmtval_find_space(
-	struct xfs_delattr_context	*dac)
+	struct xfs_attr_item		*attr)
 {
-	struct xfs_da_args		*args = dac->da_args;
-	struct xfs_bmbt_irec		*map = &dac->map;
+	struct xfs_da_args		*args = attr->xattri_da_args;
+	struct xfs_bmbt_irec		*map = &attr->xattri_map;
 	int				error;
 
-	dac->lblkno = 0;
-	dac->blkcnt = 0;
+	attr->xattri_lblkno = 0;
+	attr->xattri_blkcnt = 0;
 	args->rmtblkcnt = 0;
 	args->rmtblkno = 0;
 	memset(map, 0, sizeof(struct xfs_bmbt_irec));
@@ -584,8 +584,8 @@ xfs_attr_rmtval_find_space(
 	if (error)
 		return error;
 
-	dac->blkcnt = args->rmtblkcnt;
-	dac->lblkno = args->rmtblkno;
+	attr->xattri_blkcnt = args->rmtblkcnt;
+	attr->xattri_lblkno = args->rmtblkno;
 
 	return 0;
 }
@@ -598,17 +598,18 @@ xfs_attr_rmtval_find_space(
  */
 int
 xfs_attr_rmtval_set_blk(
-	struct xfs_delattr_context	*dac)
+	struct xfs_attr_item		*attr)
 {
-	struct xfs_da_args		*args = dac->da_args;
+	struct xfs_da_args		*args = attr->xattri_da_args;
 	struct xfs_inode		*dp = args->dp;
-	struct xfs_bmbt_irec		*map = &dac->map;
+	struct xfs_bmbt_irec		*map = &attr->xattri_map;
 	int nmap;
 	int error;
 
 	nmap = 1;
-	error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)dac->lblkno,
-			dac->blkcnt, XFS_BMAPI_ATTRFORK, args->total,
+	error = xfs_bmapi_write(args->trans, dp,
+			(xfs_fileoff_t)attr->xattri_lblkno,
+			attr->xattri_blkcnt, XFS_BMAPI_ATTRFORK, args->total,
 			map, &nmap);
 	if (error)
 		return error;
@@ -618,8 +619,8 @@ xfs_attr_rmtval_set_blk(
 	       (map->br_startblock != HOLESTARTBLOCK));
 
 	/* roll attribute extent map forwards */
-	dac->lblkno += map->br_blockcount;
-	dac->blkcnt -= map->br_blockcount;
+	attr->xattri_lblkno += map->br_blockcount;
+	attr->xattri_blkcnt -= map->br_blockcount;
 
 	return 0;
 }
@@ -673,9 +674,9 @@ xfs_attr_rmtval_invalidate(
  */
 int
 xfs_attr_rmtval_remove(
-	struct xfs_delattr_context	*dac)
+	struct xfs_attr_item		*attr)
 {
-	struct xfs_da_args		*args = dac->da_args;
+	struct xfs_da_args		*args = attr->xattri_da_args;
 	int				error, done;
 
 	/*
@@ -695,7 +696,8 @@ xfs_attr_rmtval_remove(
 	 * the parent
 	 */
 	if (!done) {
-		trace_xfs_attr_rmtval_remove_return(dac->dela_state, args->dp);
+		trace_xfs_attr_rmtval_remove_return(attr->xattri_dela_state,
+						    args->dp);
 		return -EAGAIN;
 	}
 
diff --git a/fs/xfs/libxfs/xfs_attr_remote.h b/fs/xfs/libxfs/xfs_attr_remote.h
index d72eff3..62b398e 100644
--- a/fs/xfs/libxfs/xfs_attr_remote.h
+++ b/fs/xfs/libxfs/xfs_attr_remote.h
@@ -12,9 +12,9 @@ int xfs_attr_rmtval_get(struct xfs_da_args *args);
 int xfs_attr_rmtval_stale(struct xfs_inode *ip, struct xfs_bmbt_irec *map,
 		xfs_buf_flags_t incore_flags);
 int xfs_attr_rmtval_invalidate(struct xfs_da_args *args);
-int xfs_attr_rmtval_remove(struct xfs_delattr_context *dac);
+int xfs_attr_rmtval_remove(struct xfs_attr_item *attr);
 int xfs_attr_rmt_find_hole(struct xfs_da_args *args);
 int xfs_attr_rmtval_set_value(struct xfs_da_args *args);
-int xfs_attr_rmtval_set_blk(struct xfs_delattr_context *dac);
-int xfs_attr_rmtval_find_space(struct xfs_delattr_context *dac);
+int xfs_attr_rmtval_set_blk(struct xfs_attr_item *attr);
+int xfs_attr_rmtval_find_space(struct xfs_attr_item *attr);
 #endif /* __XFS_ATTR_REMOTE_H__ */
diff --git a/fs/xfs/xfs_attr_item.c b/fs/xfs/xfs_attr_item.c
index e688ac9..6bd925f 100644
--- a/fs/xfs/xfs_attr_item.c
+++ b/fs/xfs/xfs_attr_item.c
@@ -291,11 +291,11 @@ xfs_attrd_item_release(
  */
 int
 xfs_trans_attr_finish_update(
-	struct xfs_delattr_context	*dac,
+	struct xfs_attr_item		*attr,
 	struct xfs_attrd_log_item	*attrdp,
 	uint32_t			op_flags)
 {
-	struct xfs_da_args		*args = dac->da_args;
+	struct xfs_da_args		*args = attr->xattri_da_args;
 	int				error;
 
 	error = xfs_qm_dqattach_locked(args->dp, 0);
@@ -310,11 +310,11 @@ xfs_trans_attr_finish_update(
 	switch (op_flags) {
 	case XFS_ATTR_OP_FLAGS_SET:
 		args->op_flags |= XFS_DA_OP_ADDNAME;
-		error = xfs_attr_set_iter(dac);
+		error = xfs_attr_set_iter(attr);
 		break;
 	case XFS_ATTR_OP_FLAGS_REMOVE:
 		ASSERT(XFS_IFORK_Q(args->dp));
-		error = xfs_attr_remove_iter(dac);
+		error = xfs_attr_remove_iter(attr);
 		break;
 	default:
 		error = -EFSCORRUPTED;
@@ -358,16 +358,16 @@ xfs_attr_log_item(
 	 * structure with fields from this xfs_attr_item
 	 */
 	attrp = &attrip->attri_format;
-	attrp->alfi_ino = attr->xattri_dac.da_args->dp->i_ino;
+	attrp->alfi_ino = attr->xattri_da_args->dp->i_ino;
 	attrp->alfi_op_flags = attr->xattri_op_flags;
-	attrp->alfi_value_len = attr->xattri_dac.da_args->valuelen;
-	attrp->alfi_name_len = attr->xattri_dac.da_args->namelen;
-	attrp->alfi_attr_flags = attr->xattri_dac.da_args->attr_filter;
-
-	attrip->attri_name = (void *)attr->xattri_dac.da_args->name;
-	attrip->attri_value = attr->xattri_dac.da_args->value;
-	attrip->attri_name_len = attr->xattri_dac.da_args->namelen;
-	attrip->attri_value_len = attr->xattri_dac.da_args->valuelen;
+	attrp->alfi_value_len = attr->xattri_da_args->valuelen;
+	attrp->alfi_name_len = attr->xattri_da_args->namelen;
+	attrp->alfi_attr_flags = attr->xattri_da_args->attr_filter;
+
+	attrip->attri_name = (void *)attr->xattri_da_args->name;
+	attrip->attri_value = attr->xattri_da_args->value;
+	attrip->attri_name_len = attr->xattri_da_args->namelen;
+	attrip->attri_value_len = attr->xattri_da_args->valuelen;
 }
 
 /* Get an ATTRI. */
@@ -411,10 +411,8 @@ xfs_attr_finish_item(
 	struct xfs_attr_item		*attr;
 	struct xfs_attrd_log_item	*done_item = NULL;
 	int				error;
-	struct xfs_delattr_context	*dac;
 
 	attr = container_of(item, struct xfs_attr_item, xattri_list);
-	dac = &attr->xattri_dac;
 	if (done)
 		done_item = ATTRD_ITEM(done);
 
@@ -426,19 +424,18 @@ xfs_attr_finish_item(
 	 * in a standard delay op, so we need to catch this here and rejoin the
 	 * leaf to the new transaction
 	 */
-	if (attr->xattri_dac.leaf_bp &&
-	    attr->xattri_dac.leaf_bp->b_transp != tp) {
-		xfs_trans_bjoin(tp, attr->xattri_dac.leaf_bp);
-		xfs_trans_bhold(tp, attr->xattri_dac.leaf_bp);
+	if (attr->xattri_leaf_bp && attr->xattri_leaf_bp->b_transp != tp) {
+		xfs_trans_bjoin(tp, attr->xattri_leaf_bp);
+		xfs_trans_bhold(tp, attr->xattri_leaf_bp);
 	}
 
 	/*
 	 * Always reset trans after EAGAIN cycle
 	 * since the transaction is new
 	 */
-	dac->da_args->trans = tp;
+	attr->xattri_da_args->trans = tp;
 
-	error = xfs_trans_attr_finish_update(dac, done_item,
+	error = xfs_trans_attr_finish_update(attr, done_item,
 					     attr->xattri_op_flags);
 	if (error != -EAGAIN)
 		kmem_free(attr);
@@ -600,7 +597,7 @@ xfs_attri_item_recover(
 	struct xfs_attrd_log_item	*done_item = NULL;
 	struct xfs_attr_item		attr = {
 		.xattri_op_flags	= attrip->attri_format.alfi_op_flags,
-		.xattri_dac.da_args	= &args,
+		.xattri_da_args		= &args,
 	};
 
 	/*
@@ -653,7 +650,7 @@ xfs_attri_item_recover(
 	xfs_ilock(ip, XFS_ILOCK_EXCL);
 	xfs_trans_ijoin(args.trans, ip, 0);
 
-	error = xfs_trans_attr_finish_update(&attr.xattri_dac, done_item,
+	error = xfs_trans_attr_finish_update(&attr, done_item,
 					     attrp->alfi_op_flags);
 	if (error == -EAGAIN) {
 		/*
@@ -671,7 +668,7 @@ xfs_attri_item_recover(
 		memcpy(new_args, &args, sizeof(struct xfs_da_args));
 		memcpy(new_attr, &attr, sizeof(struct xfs_attr_item));
 
-		new_attr->xattri_dac.da_args = new_args;
+		new_attr->xattri_da_args = new_args;
 		memset(&new_attr->xattri_list, 0, sizeof(struct list_head));
 
 		xfs_defer_add(args.trans, XFS_DEFER_OPS_TYPE_ATTR,
-- 
2.7.4

[PATCH v21 13/13] xfs: Add helper function xfs_attr_leaf_addname

[Allison Henderson]

This patch adds a helper function xfs_attr_leaf_addname.  While this
does help to break down xfs_attr_set_iter, it does also hoist out some
of the state management.  This patch has been moved to the end of the
clean up series for further discussion.

Suggested-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
---
 fs/xfs/libxfs/xfs_attr.c | 107 ++++++++++++++++++++++++++---------------------
 fs/xfs/xfs_trace.h       |   1 +
 2 files changed, 60 insertions(+), 48 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index cb7e689..80486b4 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -284,6 +284,64 @@ xfs_attr_sf_addname(
 	return -EAGAIN;
 }
 
+STATIC int
+xfs_attr_leaf_addname(
+	struct xfs_attr_item	*attr)
+{
+	struct xfs_da_args	*args = attr->xattri_da_args;
+	struct xfs_buf		*leaf_bp = attr->xattri_leaf_bp;
+	struct xfs_inode	*dp = args->dp;
+	int			error;
+
+	if (xfs_attr_is_leaf(dp)) {
+		error = xfs_attr_leaf_try_add(args, leaf_bp);
+		if (error == -ENOSPC) {
+			error = xfs_attr3_leaf_to_node(args);
+			if (error)
+				return error;
+
+			/*
+			 * Finish any deferred work items and roll the
+			 * transaction once more.  The goal here is to call
+			 * node_addname with the inode and transaction in the
+			 * same state (inode locked and joined, transaction
+			 * clean) no matter how we got to this step.
+			 *
+			 * At this point, we are still in XFS_DAS_UNINIT, but
+			 * when we come back, we'll be a node, so we'll fall
+			 * down into the node handling code below
+			 */
+			trace_xfs_attr_set_iter_return(
+				attr->xattri_dela_state, args->dp);
+			return -EAGAIN;
+		} else if (error) {
+			return error;
+		}
+
+		attr->xattri_dela_state = XFS_DAS_FOUND_LBLK;
+	} else {
+		error = xfs_attr_node_addname_find_attr(attr);
+		if (error)
+			return error;
+
+		error = xfs_attr_node_addname(attr);
+		if (error)
+			return error;
+
+		/*
+		 * If addname was successful, and we dont need to alloc or
+		 * remove anymore blks, we're done.
+		 */
+		if (!args->rmtblkno && !args->rmtblkno2)
+			return error;
+
+		attr->xattri_dela_state = XFS_DAS_FOUND_NBLK;
+	}
+
+	trace_xfs_attr_leaf_addname_return(attr->xattri_dela_state, args->dp);
+	return -EAGAIN;
+}
+
 /*
  * Set the attribute specified in @args.
  * This routine is meant to function as a delayed operation, and may return
@@ -319,55 +377,8 @@ xfs_attr_set_iter(
 			*leaf_bp = NULL;
 		}
 
-		if (xfs_attr_is_leaf(dp)) {
-			error = xfs_attr_leaf_try_add(args, *leaf_bp);
-			if (error == -ENOSPC) {
-				error = xfs_attr3_leaf_to_node(args);
-				if (error)
-					return error;
-
-				/*
-				 * Finish any deferred work items and roll the
-				 * transaction once more.  The goal here is to
-				 * call node_addname with the inode and
-				 * transaction in the same state (inode locked
-				 * and joined, transaction clean) no matter how
-				 * we got to this step.
-				 *
-				 * At this point, we are still in
-				 * XFS_DAS_UNINIT, but when we come back, we'll
-				 * be a node, so we'll fall down into the node
-				 * handling code below
-				 */
-				trace_xfs_attr_set_iter_return(
-					attr->xattri_dela_state, args->dp);
-				return -EAGAIN;
-			} else if (error) {
-				return error;
-			}
-
-			attr->xattri_dela_state = XFS_DAS_FOUND_LBLK;
-		} else {
-			error = xfs_attr_node_addname_find_attr(attr);
-			if (error)
-				return error;
+		return xfs_attr_leaf_addname(attr);
 
-			error = xfs_attr_node_addname(attr);
-			if (error)
-				return error;
-
-			/*
-			 * If addname was successful, and we dont need to alloc
-			 * or remove anymore blks, we're done.
-			 */
-			if (!args->rmtblkno && !args->rmtblkno2)
-				return error;
-
-			attr->xattri_dela_state = XFS_DAS_FOUND_NBLK;
-		}
-		trace_xfs_attr_set_iter_return(attr->xattri_dela_state,
-					       args->dp);
-		return -EAGAIN;
 	case XFS_DAS_FOUND_LBLK:
 		/*
 		 * If there was an out-of-line value, allocate the blocks we
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index f9840dd..cf8bd3a 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -4008,6 +4008,7 @@ DEFINE_EVENT(xfs_das_state_class, name, \
 	TP_ARGS(das, ip))
 DEFINE_DAS_STATE_EVENT(xfs_attr_sf_addname_return);
 DEFINE_DAS_STATE_EVENT(xfs_attr_set_iter_return);
+DEFINE_DAS_STATE_EVENT(xfs_attr_leaf_addname_return);
 DEFINE_DAS_STATE_EVENT(xfs_attr_node_addname_return);
 DEFINE_DAS_STATE_EVENT(xfs_attr_remove_iter_return);
 DEFINE_DAS_STATE_EVENT(xfs_attr_rmtval_remove_return);
-- 
2.7.4

Re: [PATCH v21 01/13] xfs: Return from xfs_attr_set_iter if there are no more rmtblks to process

[Darrick J. Wong]

On Wed, Jul 07, 2021 at 03:20:59PM -0700, Allison Henderson wrote:
> During an attr rename operation, blocks are saved for later removal
> as rmtblkno2. The rmtblkno is used in the case of needing to alloc
> more blocks if not enough were available.  However, in the case
> that neither rmtblkno or rmtblkno2 are set, we can return as soon
> as xfs_attr_node_addname completes, rather than rolling the transaction
> with an -EAGAIN return.  This extra loop does not hurt anything right
> now, but it will be a problem later when we get into log items because
> we end up with an empty log transaction.  So, add a simple check to
> cut out the unneeded iteration.
> 
> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
> ---
>  fs/xfs/libxfs/xfs_attr.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
> index 611dc67..5e81389 100644
> --- a/fs/xfs/libxfs/xfs_attr.c
> +++ b/fs/xfs/libxfs/xfs_attr.c
> @@ -409,6 +409,13 @@ xfs_attr_set_iter(
>  			if (error)
>  				return error;
>  
> +			/*
> +			 * If addname was successful, and we dont need to alloc
> +			 * or remove anymore blks, we're done.
> +			 */
> +			if (!args->rmtblkno && !args->rmtblkno2)
> +				return error;

Is there actually an error to return here, or could this be a 'return 0;' ?

--D

> +
>  			dac->dela_state = XFS_DAS_FOUND_NBLK;
>  		}
>  		return -EAGAIN;
> -- 
> 2.7.4
> 

Re: [PATCH v21 04/13] xfs: Handle krealloc errors in xlog_recover_add_to_cont_trans

[Darrick J. Wong]

On Wed, Jul 07, 2021 at 03:21:02PM -0700, Allison Henderson wrote:
> Because xattrs can be over a page in size, we need to handle possible
> krealloc errors to avoid warnings.  If the allocation does fail, fall
> back to kmem_alloc_large, with a memcpy.
> 
> The warning:
>    WARNING: CPU: 1 PID: 20255 at mm/page_alloc.c:3446
>                  get_page_from_freelist+0x100b/0x1690
> 
> is caused when sizes larger that a page are allocated with the
> __GFP_NOFAIL flag option.  We encounter this error now because attr
> values can be up to 64k in size.  So we cannot use __GFP_NOFAIL, and
> we need to handle the error code if the allocation fails.
> 
> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>

I'm pretty sure that 'mm: Add kvrealloc' fixes this a little more
elegantly, but either look fine to me.  So while I'll probably take
Dave's, here's a:

Reviewed-by: Darrick J. Wong <djwong@kernel.org>

in the meantime.

--D

> ---
>  fs/xfs/xfs_log_recover.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
> index ec4ccae..6ab467b 100644
> --- a/fs/xfs/xfs_log_recover.c
> +++ b/fs/xfs/xfs_log_recover.c
> @@ -2062,7 +2062,15 @@ xlog_recover_add_to_cont_trans(
>  	old_ptr = item->ri_buf[item->ri_cnt-1].i_addr;
>  	old_len = item->ri_buf[item->ri_cnt-1].i_len;
>  
> -	ptr = krealloc(old_ptr, len + old_len, GFP_KERNEL | __GFP_NOFAIL);
> +	ptr = krealloc(old_ptr, len + old_len, GFP_KERNEL);
> +	if (ptr == NULL) {
> +		ptr = kmem_alloc_large(len + old_len, KM_ZERO);
> +		if (ptr == NULL)
> +			return -ENOMEM;
> +
> +		memcpy(ptr, old_ptr, old_len);
> +	}
> +
>  	memcpy(&ptr[old_len], dp, len);
>  	item->ri_buf[item->ri_cnt-1].i_len += len;
>  	item->ri_buf[item->ri_cnt-1].i_addr = ptr;
> -- 
> 2.7.4
> 

Re: [PATCH v21 11/13] xfs: Add delattr mount option

[Darrick J. Wong]

On Wed, Jul 07, 2021 at 03:21:09PM -0700, Allison Henderson wrote:
> This patch adds a mount option to enable delayed attributes. Eventually
> this can be removed when delayed attrs becomes permanent.
> 
> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
> ---
>  fs/xfs/libxfs/xfs_attr.h | 2 +-
>  fs/xfs/xfs_mount.h       | 1 +
>  fs/xfs/xfs_super.c       | 6 +++++-
>  fs/xfs/xfs_xattr.c       | 2 ++
>  4 files changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
> index 859dbef..5141958 100644
> --- a/fs/xfs/libxfs/xfs_attr.h
> +++ b/fs/xfs/libxfs/xfs_attr.h
> @@ -30,7 +30,7 @@ struct xfs_attr_list_context;
>  
>  static inline bool xfs_hasdelattr(struct xfs_mount *mp)
>  {
> -	return false;
> +	return mp->m_flags & XFS_MOUNT_DELATTR;
>  }
>  
>  /*
> diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
> index 66a47f5..2945868 100644
> --- a/fs/xfs/xfs_mount.h
> +++ b/fs/xfs/xfs_mount.h
> @@ -257,6 +257,7 @@ typedef struct xfs_mount {
>  #define XFS_MOUNT_NOATTR2	(1ULL << 25)	/* disable use of attr2 format */
>  #define XFS_MOUNT_DAX_ALWAYS	(1ULL << 26)
>  #define XFS_MOUNT_DAX_NEVER	(1ULL << 27)
> +#define XFS_MOUNT_DELATTR	(1ULL << 28)	/* enable delayed attributes */
>  
>  /*
>   * Max and min values for mount-option defined I/O
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index c30b077..1a7edae 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
> @@ -94,7 +94,7 @@ enum {
>  	Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
>  	Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
>  	Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
> -	Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
> +	Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum, Opt_delattr
>  };
>  
>  static const struct fs_parameter_spec xfs_fs_parameters[] = {
> @@ -139,6 +139,7 @@ static const struct fs_parameter_spec xfs_fs_parameters[] = {
>  	fsparam_flag("nodiscard",	Opt_nodiscard),
>  	fsparam_flag("dax",		Opt_dax),
>  	fsparam_enum("dax",		Opt_dax_enum, dax_param_enums),
> +	fsparam_flag("delattr",		Opt_delattr),
>  	{}
>  };
>  
> @@ -1277,6 +1278,9 @@ xfs_fs_parse_param(
>  		xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
>  		return 0;
>  #endif
> +	case Opt_delattr:
> +		parsing_mp->m_flags |= XFS_MOUNT_DELATTR;
> +		return 0;

Can we restrict this to CONFIG_XFS_DEBUG=y or at least log the usual

"EXPERIMENTAL logged xattrs feature in use, use at your orkgs!"

message at mount?

--D

>  	/* Following mount options will be removed in September 2025 */
>  	case Opt_ikeep:
>  		xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_IKEEP, true);
> diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
> index 66b334f..7335423 100644
> --- a/fs/xfs/xfs_xattr.c
> +++ b/fs/xfs/xfs_xattr.c
> @@ -8,6 +8,8 @@
>  #include "xfs_shared.h"
>  #include "xfs_format.h"
>  #include "xfs_log_format.h"
> +#include "xfs_trans_resv.h"
> +#include "xfs_mount.h"
>  #include "xfs_da_format.h"
>  #include "xfs_trans_resv.h"
>  #include "xfs_mount.h"
> -- 
> 2.7.4
> 

Re: [PATCH v21 13/13] xfs: Add helper function xfs_attr_leaf_addname

[Darrick J. Wong]

On Wed, Jul 07, 2021 at 03:21:11PM -0700, Allison Henderson wrote:
> This patch adds a helper function xfs_attr_leaf_addname.  While this
> does help to break down xfs_attr_set_iter, it does also hoist out some
> of the state management.  This patch has been moved to the end of the
> clean up series for further discussion.
> 
> Suggested-by: Darrick J. Wong <djwong@kernel.org>
> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
> ---
>  fs/xfs/libxfs/xfs_attr.c | 107 ++++++++++++++++++++++++++---------------------
>  fs/xfs/xfs_trace.h       |   1 +
>  2 files changed, 60 insertions(+), 48 deletions(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
> index cb7e689..80486b4 100644
> --- a/fs/xfs/libxfs/xfs_attr.c
> +++ b/fs/xfs/libxfs/xfs_attr.c
> @@ -284,6 +284,64 @@ xfs_attr_sf_addname(
>  	return -EAGAIN;
>  }
>  
> +STATIC int
> +xfs_attr_leaf_addname(
> +	struct xfs_attr_item	*attr)
> +{
> +	struct xfs_da_args	*args = attr->xattri_da_args;
> +	struct xfs_buf		*leaf_bp = attr->xattri_leaf_bp;
> +	struct xfs_inode	*dp = args->dp;
> +	int			error;
> +
> +	if (xfs_attr_is_leaf(dp)) {
> +		error = xfs_attr_leaf_try_add(args, leaf_bp);
> +		if (error == -ENOSPC) {
> +			error = xfs_attr3_leaf_to_node(args);
> +			if (error)
> +				return error;
> +
> +			/*
> +			 * Finish any deferred work items and roll the
> +			 * transaction once more.  The goal here is to call
> +			 * node_addname with the inode and transaction in the
> +			 * same state (inode locked and joined, transaction
> +			 * clean) no matter how we got to this step.
> +			 *
> +			 * At this point, we are still in XFS_DAS_UNINIT, but
> +			 * when we come back, we'll be a node, so we'll fall
> +			 * down into the node handling code below
> +			 */
> +			trace_xfs_attr_set_iter_return(
> +				attr->xattri_dela_state, args->dp);
> +			return -EAGAIN;
> +		} else if (error) {

Silly nit: No need for else if, regular if works fine here.

Oh, hm, this is just a hoist patch, and we're not supposed to
hoist-and-mutate.  But this is a small change, so fmeh rules.

With that tidied,
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

--D

> +			return error;
> +		}
> +
> +		attr->xattri_dela_state = XFS_DAS_FOUND_LBLK;
> +	} else {
> +		error = xfs_attr_node_addname_find_attr(attr);
> +		if (error)
> +			return error;
> +
> +		error = xfs_attr_node_addname(attr);
> +		if (error)
> +			return error;
> +
> +		/*
> +		 * If addname was successful, and we dont need to alloc or
> +		 * remove anymore blks, we're done.
> +		 */
> +		if (!args->rmtblkno && !args->rmtblkno2)
> +			return error;
> +
> +		attr->xattri_dela_state = XFS_DAS_FOUND_NBLK;
> +	}
> +
> +	trace_xfs_attr_leaf_addname_return(attr->xattri_dela_state, args->dp);
> +	return -EAGAIN;
> +}
> +
>  /*
>   * Set the attribute specified in @args.
>   * This routine is meant to function as a delayed operation, and may return
> @@ -319,55 +377,8 @@ xfs_attr_set_iter(
>  			*leaf_bp = NULL;
>  		}
>  
> -		if (xfs_attr_is_leaf(dp)) {
> -			error = xfs_attr_leaf_try_add(args, *leaf_bp);
> -			if (error == -ENOSPC) {
> -				error = xfs_attr3_leaf_to_node(args);
> -				if (error)
> -					return error;
> -
> -				/*
> -				 * Finish any deferred work items and roll the
> -				 * transaction once more.  The goal here is to
> -				 * call node_addname with the inode and
> -				 * transaction in the same state (inode locked
> -				 * and joined, transaction clean) no matter how
> -				 * we got to this step.
> -				 *
> -				 * At this point, we are still in
> -				 * XFS_DAS_UNINIT, but when we come back, we'll
> -				 * be a node, so we'll fall down into the node
> -				 * handling code below
> -				 */
> -				trace_xfs_attr_set_iter_return(
> -					attr->xattri_dela_state, args->dp);
> -				return -EAGAIN;
> -			} else if (error) {
> -				return error;
> -			}
> -
> -			attr->xattri_dela_state = XFS_DAS_FOUND_LBLK;
> -		} else {
> -			error = xfs_attr_node_addname_find_attr(attr);
> -			if (error)
> -				return error;
> +		return xfs_attr_leaf_addname(attr);
>  
> -			error = xfs_attr_node_addname(attr);
> -			if (error)
> -				return error;
> -
> -			/*
> -			 * If addname was successful, and we dont need to alloc
> -			 * or remove anymore blks, we're done.
> -			 */
> -			if (!args->rmtblkno && !args->rmtblkno2)
> -				return error;
> -
> -			attr->xattri_dela_state = XFS_DAS_FOUND_NBLK;
> -		}
> -		trace_xfs_attr_set_iter_return(attr->xattri_dela_state,
> -					       args->dp);
> -		return -EAGAIN;
>  	case XFS_DAS_FOUND_LBLK:
>  		/*
>  		 * If there was an out-of-line value, allocate the blocks we
> diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
> index f9840dd..cf8bd3a 100644
> --- a/fs/xfs/xfs_trace.h
> +++ b/fs/xfs/xfs_trace.h
> @@ -4008,6 +4008,7 @@ DEFINE_EVENT(xfs_das_state_class, name, \
>  	TP_ARGS(das, ip))
>  DEFINE_DAS_STATE_EVENT(xfs_attr_sf_addname_return);
>  DEFINE_DAS_STATE_EVENT(xfs_attr_set_iter_return);
> +DEFINE_DAS_STATE_EVENT(xfs_attr_leaf_addname_return);
>  DEFINE_DAS_STATE_EVENT(xfs_attr_node_addname_return);
>  DEFINE_DAS_STATE_EVENT(xfs_attr_remove_iter_return);
>  DEFINE_DAS_STATE_EVENT(xfs_attr_rmtval_remove_return);
> -- 
> 2.7.4
> 

Re: [PATCH v21 13/13] xfs: Add helper function xfs_attr_leaf_addname

[Allison Henderson]

On 7/8/21 9:17 PM, Darrick J. Wong wrote:
> On Wed, Jul 07, 2021 at 03:21:11PM -0700, Allison Henderson wrote:
>> This patch adds a helper function xfs_attr_leaf_addname.  While this
>> does help to break down xfs_attr_set_iter, it does also hoist out some
>> of the state management.  This patch has been moved to the end of the
>> clean up series for further discussion.
>>
>> Suggested-by: Darrick J. Wong <djwong@kernel.org>
>> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
>> ---
>>   fs/xfs/libxfs/xfs_attr.c | 107 ++++++++++++++++++++++++++---------------------
>>   fs/xfs/xfs_trace.h       |   1 +
>>   2 files changed, 60 insertions(+), 48 deletions(-)
>>
>> diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
>> index cb7e689..80486b4 100644
>> --- a/fs/xfs/libxfs/xfs_attr.c
>> +++ b/fs/xfs/libxfs/xfs_attr.c
>> @@ -284,6 +284,64 @@ xfs_attr_sf_addname(
>>   	return -EAGAIN;
>>   }
>>   
>> +STATIC int
>> +xfs_attr_leaf_addname(
>> +	struct xfs_attr_item	*attr)
>> +{
>> +	struct xfs_da_args	*args = attr->xattri_da_args;
>> +	struct xfs_buf		*leaf_bp = attr->xattri_leaf_bp;
>> +	struct xfs_inode	*dp = args->dp;
>> +	int			error;
>> +
>> +	if (xfs_attr_is_leaf(dp)) {
>> +		error = xfs_attr_leaf_try_add(args, leaf_bp);
>> +		if (error == -ENOSPC) {
>> +			error = xfs_attr3_leaf_to_node(args);
>> +			if (error)
>> +				return error;
>> +
>> +			/*
>> +			 * Finish any deferred work items and roll the
>> +			 * transaction once more.  The goal here is to call
>> +			 * node_addname with the inode and transaction in the
>> +			 * same state (inode locked and joined, transaction
>> +			 * clean) no matter how we got to this step.
>> +			 *
>> +			 * At this point, we are still in XFS_DAS_UNINIT, but
>> +			 * when we come back, we'll be a node, so we'll fall
>> +			 * down into the node handling code below
>> +			 */
>> +			trace_xfs_attr_set_iter_return(
>> +				attr->xattri_dela_state, args->dp);
>> +			return -EAGAIN;
>> +		} else if (error) {
> 
> Silly nit: No need for else if, regular if works fine here.
> 
> Oh, hm, this is just a hoist patch, and we're not supposed to
> hoist-and-mutate.  But this is a small change, so fmeh rules.
> 
> With that tidied,
> Reviewed-by: Darrick J. Wong <djwong@kernel.org>

Alrighty, will do.  Thanks!
Allison

> 
> --D
> 
>> +			return error;
>> +		}
>> +
>> +		attr->xattri_dela_state = XFS_DAS_FOUND_LBLK;
>> +	} else {
>> +		error = xfs_attr_node_addname_find_attr(attr);
>> +		if (error)
>> +			return error;
>> +
>> +		error = xfs_attr_node_addname(attr);
>> +		if (error)
>> +			return error;
>> +
>> +		/*
>> +		 * If addname was successful, and we dont need to alloc or
>> +		 * remove anymore blks, we're done.
>> +		 */
>> +		if (!args->rmtblkno && !args->rmtblkno2)
>> +			return error;
>> +
>> +		attr->xattri_dela_state = XFS_DAS_FOUND_NBLK;
>> +	}
>> +
>> +	trace_xfs_attr_leaf_addname_return(attr->xattri_dela_state, args->dp);
>> +	return -EAGAIN;
>> +}
>> +
>>   /*
>>    * Set the attribute specified in @args.
>>    * This routine is meant to function as a delayed operation, and may return
>> @@ -319,55 +377,8 @@ xfs_attr_set_iter(
>>   			*leaf_bp = NULL;
>>   		}
>>   
>> -		if (xfs_attr_is_leaf(dp)) {
>> -			error = xfs_attr_leaf_try_add(args, *leaf_bp);
>> -			if (error == -ENOSPC) {
>> -				error = xfs_attr3_leaf_to_node(args);
>> -				if (error)
>> -					return error;
>> -
>> -				/*
>> -				 * Finish any deferred work items and roll the
>> -				 * transaction once more.  The goal here is to
>> -				 * call node_addname with the inode and
>> -				 * transaction in the same state (inode locked
>> -				 * and joined, transaction clean) no matter how
>> -				 * we got to this step.
>> -				 *
>> -				 * At this point, we are still in
>> -				 * XFS_DAS_UNINIT, but when we come back, we'll
>> -				 * be a node, so we'll fall down into the node
>> -				 * handling code below
>> -				 */
>> -				trace_xfs_attr_set_iter_return(
>> -					attr->xattri_dela_state, args->dp);
>> -				return -EAGAIN;
>> -			} else if (error) {
>> -				return error;
>> -			}
>> -
>> -			attr->xattri_dela_state = XFS_DAS_FOUND_LBLK;
>> -		} else {
>> -			error = xfs_attr_node_addname_find_attr(attr);
>> -			if (error)
>> -				return error;
>> +		return xfs_attr_leaf_addname(attr);
>>   
>> -			error = xfs_attr_node_addname(attr);
>> -			if (error)
>> -				return error;
>> -
>> -			/*
>> -			 * If addname was successful, and we dont need to alloc
>> -			 * or remove anymore blks, we're done.
>> -			 */
>> -			if (!args->rmtblkno && !args->rmtblkno2)
>> -				return error;
>> -
>> -			attr->xattri_dela_state = XFS_DAS_FOUND_NBLK;
>> -		}
>> -		trace_xfs_attr_set_iter_return(attr->xattri_dela_state,
>> -					       args->dp);
>> -		return -EAGAIN;
>>   	case XFS_DAS_FOUND_LBLK:
>>   		/*
>>   		 * If there was an out-of-line value, allocate the blocks we
>> diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
>> index f9840dd..cf8bd3a 100644
>> --- a/fs/xfs/xfs_trace.h
>> +++ b/fs/xfs/xfs_trace.h
>> @@ -4008,6 +4008,7 @@ DEFINE_EVENT(xfs_das_state_class, name, \
>>   	TP_ARGS(das, ip))
>>   DEFINE_DAS_STATE_EVENT(xfs_attr_sf_addname_return);
>>   DEFINE_DAS_STATE_EVENT(xfs_attr_set_iter_return);
>> +DEFINE_DAS_STATE_EVENT(xfs_attr_leaf_addname_return);
>>   DEFINE_DAS_STATE_EVENT(xfs_attr_node_addname_return);
>>   DEFINE_DAS_STATE_EVENT(xfs_attr_remove_iter_return);
>>   DEFINE_DAS_STATE_EVENT(xfs_attr_rmtval_remove_return);
>> -- 
>> 2.7.4
>>

Re: [PATCH v21 01/13] xfs: Return from xfs_attr_set_iter if there are no more rmtblks to process

[Allison Henderson]

On 7/8/21 9:05 PM, Darrick J. Wong wrote:
> On Wed, Jul 07, 2021 at 03:20:59PM -0700, Allison Henderson wrote:
>> During an attr rename operation, blocks are saved for later removal
>> as rmtblkno2. The rmtblkno is used in the case of needing to alloc
>> more blocks if not enough were available.  However, in the case
>> that neither rmtblkno or rmtblkno2 are set, we can return as soon
>> as xfs_attr_node_addname completes, rather than rolling the transaction
>> with an -EAGAIN return.  This extra loop does not hurt anything right
>> now, but it will be a problem later when we get into log items because
>> we end up with an empty log transaction.  So, add a simple check to
>> cut out the unneeded iteration.
>>
>> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
>> ---
>>   fs/xfs/libxfs/xfs_attr.c | 7 +++++++
>>   1 file changed, 7 insertions(+)
>>
>> diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
>> index 611dc67..5e81389 100644
>> --- a/fs/xfs/libxfs/xfs_attr.c
>> +++ b/fs/xfs/libxfs/xfs_attr.c
>> @@ -409,6 +409,13 @@ xfs_attr_set_iter(
>>   			if (error)
>>   				return error;
>>   
>> +			/*
>> +			 * If addname was successful, and we dont need to alloc
>> +			 * or remove anymore blks, we're done.
>> +			 */
>> +			if (!args->rmtblkno && !args->rmtblkno2)
>> +				return error;
> 
> Is there actually an error to return here, or could this be a 'return 0;' ?
> 
> --D
Error is zero here, I just try to make the code consistent looking.  It 
can be a hard zero if folk prefer.

Allison

> 
>> +
>>   			dac->dela_state = XFS_DAS_FOUND_NBLK;
>>   		}
>>   		return -EAGAIN;
>> -- 
>> 2.7.4
>>

Re: [PATCH v21 04/13] xfs: Handle krealloc errors in xlog_recover_add_to_cont_trans

[Allison Henderson]

On 7/8/21 9:09 PM, Darrick J. Wong wrote:
> On Wed, Jul 07, 2021 at 03:21:02PM -0700, Allison Henderson wrote:
>> Because xattrs can be over a page in size, we need to handle possible
>> krealloc errors to avoid warnings.  If the allocation does fail, fall
>> back to kmem_alloc_large, with a memcpy.
>>
>> The warning:
>>     WARNING: CPU: 1 PID: 20255 at mm/page_alloc.c:3446
>>                   get_page_from_freelist+0x100b/0x1690
>>
>> is caused when sizes larger that a page are allocated with the
>> __GFP_NOFAIL flag option.  We encounter this error now because attr
>> values can be up to 64k in size.  So we cannot use __GFP_NOFAIL, and
>> we need to handle the error code if the allocation fails.
>>
>> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
> 
> I'm pretty sure that 'mm: Add kvrealloc' fixes this a little more
> elegantly, but either look fine to me.  So while I'll probably take
> Dave's, here's a:
> 
> Reviewed-by: Darrick J. Wong <djwong@kernel.org>
> 
> in the meantime.

Alrighty, thank you!  Either is fine.

Allison

> 
> --D
> 
>> ---
>>   fs/xfs/xfs_log_recover.c | 10 +++++++++-
>>   1 file changed, 9 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
>> index ec4ccae..6ab467b 100644
>> --- a/fs/xfs/xfs_log_recover.c
>> +++ b/fs/xfs/xfs_log_recover.c
>> @@ -2062,7 +2062,15 @@ xlog_recover_add_to_cont_trans(
>>   	old_ptr = item->ri_buf[item->ri_cnt-1].i_addr;
>>   	old_len = item->ri_buf[item->ri_cnt-1].i_len;
>>   
>> -	ptr = krealloc(old_ptr, len + old_len, GFP_KERNEL | __GFP_NOFAIL);
>> +	ptr = krealloc(old_ptr, len + old_len, GFP_KERNEL);
>> +	if (ptr == NULL) {
>> +		ptr = kmem_alloc_large(len + old_len, KM_ZERO);
>> +		if (ptr == NULL)
>> +			return -ENOMEM;
>> +
>> +		memcpy(ptr, old_ptr, old_len);
>> +	}
>> +
>>   	memcpy(&ptr[old_len], dp, len);
>>   	item->ri_buf[item->ri_cnt-1].i_len += len;
>>   	item->ri_buf[item->ri_cnt-1].i_addr = ptr;
>> -- 
>> 2.7.4
>>

Re: [PATCH v21 11/13] xfs: Add delattr mount option

[Allison Henderson]

On 7/8/21 9:14 PM, Darrick J. Wong wrote:
> On Wed, Jul 07, 2021 at 03:21:09PM -0700, Allison Henderson wrote:
>> This patch adds a mount option to enable delayed attributes. Eventually
>> this can be removed when delayed attrs becomes permanent.
>>
>> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
>> ---
>>   fs/xfs/libxfs/xfs_attr.h | 2 +-
>>   fs/xfs/xfs_mount.h       | 1 +
>>   fs/xfs/xfs_super.c       | 6 +++++-
>>   fs/xfs/xfs_xattr.c       | 2 ++
>>   4 files changed, 9 insertions(+), 2 deletions(-)
>>
>> diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
>> index 859dbef..5141958 100644
>> --- a/fs/xfs/libxfs/xfs_attr.h
>> +++ b/fs/xfs/libxfs/xfs_attr.h
>> @@ -30,7 +30,7 @@ struct xfs_attr_list_context;
>>   
>>   static inline bool xfs_hasdelattr(struct xfs_mount *mp)
>>   {
>> -	return false;
>> +	return mp->m_flags & XFS_MOUNT_DELATTR;
>>   }
>>   
>>   /*
>> diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
>> index 66a47f5..2945868 100644
>> --- a/fs/xfs/xfs_mount.h
>> +++ b/fs/xfs/xfs_mount.h
>> @@ -257,6 +257,7 @@ typedef struct xfs_mount {
>>   #define XFS_MOUNT_NOATTR2	(1ULL << 25)	/* disable use of attr2 format */
>>   #define XFS_MOUNT_DAX_ALWAYS	(1ULL << 26)
>>   #define XFS_MOUNT_DAX_NEVER	(1ULL << 27)
>> +#define XFS_MOUNT_DELATTR	(1ULL << 28)	/* enable delayed attributes */
>>   
>>   /*
>>    * Max and min values for mount-option defined I/O
>> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
>> index c30b077..1a7edae 100644
>> --- a/fs/xfs/xfs_super.c
>> +++ b/fs/xfs/xfs_super.c
>> @@ -94,7 +94,7 @@ enum {
>>   	Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
>>   	Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
>>   	Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
>> -	Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
>> +	Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum, Opt_delattr
>>   };
>>   
>>   static const struct fs_parameter_spec xfs_fs_parameters[] = {
>> @@ -139,6 +139,7 @@ static const struct fs_parameter_spec xfs_fs_parameters[] = {
>>   	fsparam_flag("nodiscard",	Opt_nodiscard),
>>   	fsparam_flag("dax",		Opt_dax),
>>   	fsparam_enum("dax",		Opt_dax_enum, dax_param_enums),
>> +	fsparam_flag("delattr",		Opt_delattr),
>>   	{}
>>   };
>>   
>> @@ -1277,6 +1278,9 @@ xfs_fs_parse_param(
>>   		xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
>>   		return 0;
>>   #endif
>> +	case Opt_delattr:
>> +		parsing_mp->m_flags |= XFS_MOUNT_DELATTR;
>> +		return 0;
> 
> Can we restrict this to CONFIG_XFS_DEBUG=y or at least log the usual
> 
> "EXPERIMENTAL logged xattrs feature in use, use at your orkgs!"
> 
> message at mount?
Sure, will add that in.  Thx!
Allison

> 
> --D
> 
>>   	/* Following mount options will be removed in September 2025 */
>>   	case Opt_ikeep:
>>   		xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_IKEEP, true);
>> diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
>> index 66b334f..7335423 100644
>> --- a/fs/xfs/xfs_xattr.c
>> +++ b/fs/xfs/xfs_xattr.c
>> @@ -8,6 +8,8 @@
>>   #include "xfs_shared.h"
>>   #include "xfs_format.h"
>>   #include "xfs_log_format.h"
>> +#include "xfs_trans_resv.h"
>> +#include "xfs_mount.h"
>>   #include "xfs_da_format.h"
>>   #include "xfs_trans_resv.h"
>>   #include "xfs_mount.h"
>> -- 
>> 2.7.4
>>

Re: [PATCH v21 05/13] xfs: Set up infrastructure for deferred attribute operations

[Darrick J. Wong]

On Wed, Jul 07, 2021 at 03:21:03PM -0700, Allison Henderson wrote:
> Currently attributes are modified directly across one or more
> transactions. But they are not logged or replayed in the event of an
> error. The goal of delayed attributes is to enable logging and replaying
> of attribute operations using the existing delayed operations
> infrastructure.  This will later enable the attributes to become part of
> larger multi part operations that also must first be recorded to the
> log.  This is mostly of interest in the scheme of parent pointers which
> would need to maintain an attribute containing parent inode information
> any time an inode is moved, created, or removed.  Parent pointers would
> then be of interest to any feature that would need to quickly derive an
> inode path from the mount point. Online scrub, nfs lookups and fs grow
> or shrink operations are all features that could take advantage of this.
> 
> This patch adds two new log item types for setting or removing
> attributes as deferred operations.  The xfs_attri_log_item will log an
> intent to set or remove an attribute.  The corresponding
> xfs_attrd_log_item holds a reference to the xfs_attri_log_item and is
> freed once the transaction is done.  Both log items use a generic
> xfs_attr_log_format structure that contains the attribute name, value,
> flags, inode, and an op_flag that indicates if the operations is a set
> or remove.
> 
> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
> ---
>  fs/xfs/Makefile                 |   1 +
>  fs/xfs/libxfs/xfs_attr.c        |   5 +-
>  fs/xfs/libxfs/xfs_attr.h        |  31 +++
>  fs/xfs/libxfs/xfs_defer.h       |   2 +
>  fs/xfs/libxfs/xfs_log_format.h  |  44 +++-
>  fs/xfs/libxfs/xfs_log_recover.h |   2 +
>  fs/xfs/scrub/common.c           |   2 +
>  fs/xfs/xfs_acl.c                |   2 +
>  fs/xfs/xfs_attr_item.c          | 460 ++++++++++++++++++++++++++++++++++++++++
>  fs/xfs/xfs_attr_item.h          |  52 +++++
>  fs/xfs/xfs_attr_list.c          |   1 +
>  fs/xfs/xfs_ioctl.c              |   2 +
>  fs/xfs/xfs_ioctl32.c            |   2 +
>  fs/xfs/xfs_iops.c               |   2 +
>  fs/xfs/xfs_log_recover.c        |   2 +
>  fs/xfs/xfs_ondisk.h             |   2 +
>  fs/xfs/xfs_xattr.c              |   1 +
>  17 files changed, 608 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
> index 04611a1..b056cfc 100644
> --- a/fs/xfs/Makefile
> +++ b/fs/xfs/Makefile
> @@ -102,6 +102,7 @@ xfs-y				+= xfs_log.o \
>  				   xfs_buf_item_recover.o \
>  				   xfs_dquot_item_recover.o \
>  				   xfs_extfree_item.o \
> +				   xfs_attr_item.o \
>  				   xfs_icreate_item.o \
>  				   xfs_inode_item.o \
>  				   xfs_inode_item_recover.o \
> diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
> index 8d51607..bdcdadc 100644
> --- a/fs/xfs/libxfs/xfs_attr.c
> +++ b/fs/xfs/libxfs/xfs_attr.c
> @@ -24,6 +24,7 @@
>  #include "xfs_quota.h"
>  #include "xfs_trans_space.h"
>  #include "xfs_trace.h"
> +#include "xfs_attr_item.h"
>  
>  /*
>   * xfs_attr.c
> @@ -61,8 +62,6 @@ STATIC int xfs_attr_node_hasname(xfs_da_args_t *args,
>  				 struct xfs_da_state **state);
>  STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
>  STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
> -STATIC int xfs_attr_set_iter(struct xfs_delattr_context *dac,
> -			     struct xfs_buf **leaf_bp);
>  STATIC int xfs_attr_node_removename(struct xfs_da_args *args,
>  				    struct xfs_da_state *state);
>  
> @@ -166,7 +165,7 @@ xfs_attr_get(
>  /*
>   * Calculate how many blocks we need for the new attribute,
>   */
> -STATIC int
> +int
>  xfs_attr_calc_size(
>  	struct xfs_da_args	*args,
>  	int			*local)
> diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
> index 8de5d1d..4ee5165 100644
> --- a/fs/xfs/libxfs/xfs_attr.h
> +++ b/fs/xfs/libxfs/xfs_attr.h
> @@ -28,6 +28,11 @@ struct xfs_attr_list_context;
>   */
>  #define	ATTR_MAX_VALUELEN	(64*1024)	/* max length of a value */
>  
> +static inline bool xfs_hasdelattr(struct xfs_mount *mp)
> +{
> +	return false;
> +}
> +
>  /*
>   * Kernel-internal version of the attrlist cursor.
>   */
> @@ -454,6 +459,7 @@ enum xfs_delattr_state {
>   */
>  #define XFS_DAC_DEFER_FINISH		0x01 /* finish the transaction */
>  #define XFS_DAC_LEAF_ADDNAME_INIT	0x02 /* xfs_attr_leaf_addname init*/
> +#define XFS_DAC_DELAYED_OP_INIT		0x04 /* delayed operations init*/
>  
>  /*
>   * Context used for keeping track of delayed attribute operations
> @@ -461,6 +467,11 @@ enum xfs_delattr_state {
>  struct xfs_delattr_context {
>  	struct xfs_da_args      *da_args;
>  
> +	/*
> +	 * Used by xfs_attr_set to hold a leaf buffer across a transaction roll
> +	 */
> +	struct xfs_buf		*leaf_bp;
> +
>  	/* Used in xfs_attr_rmtval_set_blk to roll through allocating blocks */
>  	struct xfs_bmbt_irec	map;
>  	xfs_dablk_t		lblkno;
> @@ -474,6 +485,23 @@ struct xfs_delattr_context {
>  	enum xfs_delattr_state  dela_state;
>  };
>  
> +/*
> + * List of attrs to commit later.
> + */
> +struct xfs_attr_item {
> +	struct xfs_delattr_context	xattri_dac;
> +
> +	/*
> +	 * Indicates if the attr operation is a set or a remove
> +	 * XFS_ATTR_OP_FLAGS_{SET,REMOVE}
> +	 */
> +	uint32_t			xattri_op_flags;

This could be a regular unsigned int.

> +
> +	/* used to log this item to an intent */
> +	struct list_head		xattri_list;
> +};
> +
> +
>  /*========================================================================
>   * Function prototypes for the kernel.
>   *========================================================================*/
> @@ -490,11 +518,14 @@ int xfs_attr_get_ilocked(struct xfs_da_args *args);
>  int xfs_attr_get(struct xfs_da_args *args);
>  int xfs_attr_set(struct xfs_da_args *args);
>  int xfs_attr_set_args(struct xfs_da_args *args);
> +int xfs_attr_set_iter(struct xfs_delattr_context *dac,
> +		      struct xfs_buf **leaf_bp);
>  int xfs_has_attr(struct xfs_da_args *args);
>  int xfs_attr_remove_args(struct xfs_da_args *args);
>  int xfs_attr_remove_iter(struct xfs_delattr_context *dac);
>  bool xfs_attr_namecheck(const void *name, size_t length);
>  void xfs_delattr_context_init(struct xfs_delattr_context *dac,
>  			      struct xfs_da_args *args);
> +int xfs_attr_calc_size(struct xfs_da_args *args, int *local);
>  
>  #endif	/* __XFS_ATTR_H__ */
> diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
> index 05472f7..0ed9dfa 100644
> --- a/fs/xfs/libxfs/xfs_defer.h
> +++ b/fs/xfs/libxfs/xfs_defer.h
> @@ -63,6 +63,8 @@ extern const struct xfs_defer_op_type xfs_refcount_update_defer_type;
>  extern const struct xfs_defer_op_type xfs_rmap_update_defer_type;
>  extern const struct xfs_defer_op_type xfs_extent_free_defer_type;
>  extern const struct xfs_defer_op_type xfs_agfl_free_defer_type;
> +extern const struct xfs_defer_op_type xfs_attr_defer_type;
> +
>  
>  /*
>   * This structure enables a dfops user to detach the chain of deferred
> diff --git a/fs/xfs/libxfs/xfs_log_format.h b/fs/xfs/libxfs/xfs_log_format.h
> index 78d5368..34011c8 100644
> --- a/fs/xfs/libxfs/xfs_log_format.h
> +++ b/fs/xfs/libxfs/xfs_log_format.h
> @@ -113,7 +113,12 @@ struct xfs_unmount_log_format {
>  #define XLOG_REG_TYPE_CUD_FORMAT	24
>  #define XLOG_REG_TYPE_BUI_FORMAT	25
>  #define XLOG_REG_TYPE_BUD_FORMAT	26
> -#define XLOG_REG_TYPE_MAX		26
> +#define XLOG_REG_TYPE_ATTRI_FORMAT	27
> +#define XLOG_REG_TYPE_ATTRD_FORMAT	28
> +#define XLOG_REG_TYPE_ATTR_NAME	29
> +#define XLOG_REG_TYPE_ATTR_VALUE	30
> +#define XLOG_REG_TYPE_MAX		30
> +
>  
>  /*
>   * Flags to log operation header
> @@ -236,6 +241,8 @@ typedef struct xfs_trans_header {
>  #define	XFS_LI_CUD		0x1243
>  #define	XFS_LI_BUI		0x1244	/* bmbt update intent */
>  #define	XFS_LI_BUD		0x1245
> +#define	XFS_LI_ATTRI		0x1246  /* attr set/remove intent*/
> +#define	XFS_LI_ATTRD		0x1247  /* attr set/remove done */
>  
>  #define XFS_LI_TYPE_DESC \
>  	{ XFS_LI_EFI,		"XFS_LI_EFI" }, \
> @@ -251,7 +258,9 @@ typedef struct xfs_trans_header {
>  	{ XFS_LI_CUI,		"XFS_LI_CUI" }, \
>  	{ XFS_LI_CUD,		"XFS_LI_CUD" }, \
>  	{ XFS_LI_BUI,		"XFS_LI_BUI" }, \
> -	{ XFS_LI_BUD,		"XFS_LI_BUD" }
> +	{ XFS_LI_BUD,		"XFS_LI_BUD" }, \
> +	{ XFS_LI_ATTRI,		"XFS_LI_ATTRI" }, \
> +	{ XFS_LI_ATTRD,		"XFS_LI_ATTRD" }
>  
>  /*
>   * Inode Log Item Format definitions.
> @@ -859,4 +868,35 @@ struct xfs_icreate_log {
>  	__be32		icl_gen;	/* inode generation number to use */
>  };
>  
> +/*
> + * Flags for deferred attribute operations.
> + * Upper bits are flags, lower byte is type code
> + */
> +#define XFS_ATTR_OP_FLAGS_SET		1	/* Set the attribute */
> +#define XFS_ATTR_OP_FLAGS_REMOVE	2	/* Remove the attribute */
> +#define XFS_ATTR_OP_FLAGS_TYPE_MASK	0x0FF	/* Flags type mask */

0xFF, not 0x0FF?

> +
> +/*
> + * This is the structure used to lay out an attr log item in the
> + * log.
> + */
> +struct xfs_attri_log_format {
> +	uint16_t	alfi_type;	/* attri log item type */
> +	uint16_t	alfi_size;	/* size of this item */
> +	uint32_t	__pad;		/* pad to 64 bit aligned */
> +	uint64_t	alfi_id;	/* attri identifier */
> +	uint64_t	alfi_ino;	/* the inode for this attr operation */
> +	uint32_t	alfi_op_flags;	/* marks the op as a set or remove */
> +	uint32_t	alfi_name_len;	/* attr name length */
> +	uint32_t	alfi_value_len;	/* attr value length */
> +	uint32_t	alfi_attr_flags;/* attr flags */
> +};
> +
> +struct xfs_attrd_log_format {
> +	uint16_t	alfd_type;	/* attrd log item type */
> +	uint16_t	alfd_size;	/* size of this item */
> +	uint32_t	__pad;		/* pad to 64 bit aligned */
> +	uint64_t	alfd_alf_id;	/* id of corresponding attri */
> +};
> +
>  #endif /* __XFS_LOG_FORMAT_H__ */
> diff --git a/fs/xfs/libxfs/xfs_log_recover.h b/fs/xfs/libxfs/xfs_log_recover.h
> index 3cca2bf..b6e5514 100644
> --- a/fs/xfs/libxfs/xfs_log_recover.h
> +++ b/fs/xfs/libxfs/xfs_log_recover.h
> @@ -72,6 +72,8 @@ extern const struct xlog_recover_item_ops xlog_rui_item_ops;
>  extern const struct xlog_recover_item_ops xlog_rud_item_ops;
>  extern const struct xlog_recover_item_ops xlog_cui_item_ops;
>  extern const struct xlog_recover_item_ops xlog_cud_item_ops;
> +extern const struct xlog_recover_item_ops xlog_attri_item_ops;
> +extern const struct xlog_recover_item_ops xlog_attrd_item_ops;
>  
>  /*
>   * Macros, structures, prototypes for internal log manager use.
> diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
> index cadfd57..32e46f8 100644
> --- a/fs/xfs/scrub/common.c
> +++ b/fs/xfs/scrub/common.c
> @@ -23,6 +23,8 @@
>  #include "xfs_rmap_btree.h"
>  #include "xfs_log.h"
>  #include "xfs_trans_priv.h"
> +#include "xfs_da_format.h"
> +#include "xfs_da_btree.h"
>  #include "xfs_attr.h"
>  #include "xfs_reflink.h"
>  #include "xfs_ag.h"
> diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c
> index d02bef2..b8673c6 100644
> --- a/fs/xfs/xfs_acl.c
> +++ b/fs/xfs/xfs_acl.c
> @@ -10,6 +10,8 @@
>  #include "xfs_trans_resv.h"
>  #include "xfs_mount.h"
>  #include "xfs_inode.h"
> +#include "xfs_da_format.h"
> +#include "xfs_da_btree.h"
>  #include "xfs_attr.h"
>  #include "xfs_trace.h"
>  #include "xfs_error.h"
> diff --git a/fs/xfs/xfs_attr_item.c b/fs/xfs/xfs_attr_item.c
> new file mode 100644
> index 0000000..c9033e2
> --- /dev/null
> +++ b/fs/xfs/xfs_attr_item.c
> @@ -0,0 +1,460 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2021 Oracle.  All Rights Reserved.
> + * Author: Allison Collins <allison.henderson@oracle.com>
> + */
> +
> +#include "xfs.h"
> +#include "xfs_fs.h"
> +#include "xfs_format.h"
> +#include "xfs_log_format.h"
> +#include "xfs_trans_resv.h"
> +#include "xfs_bit.h"
> +#include "xfs_shared.h"
> +#include "xfs_mount.h"
> +#include "xfs_defer.h"
> +#include "xfs_da_format.h"
> +#include "xfs_log_format.h"
> +#include "xfs_trans.h"
> +#include "xfs_bmap.h"
> +#include "xfs_bmap_btree.h"
> +#include "xfs_trans_priv.h"
> +#include "xfs_buf_item.h"
> +#include "xfs_attr_item.h"
> +#include "xfs_log.h"
> +#include "xfs_btree.h"
> +#include "xfs_rmap.h"
> +#include "xfs_inode.h"
> +#include "xfs_icache.h"
> +#include "xfs_da_format.h"
> +#include "xfs_da_btree.h"
> +#include "xfs_attr.h"
> +#include "xfs_shared.h"
> +#include "xfs_attr_item.h"
> +#include "xfs_alloc.h"
> +#include "xfs_bmap.h"
> +#include "xfs_trace.h"
> +#include "libxfs/xfs_da_format.h"
> +#include "xfs_inode.h"
> +#include "xfs_quota.h"
> +#include "xfs_trans_space.h"
> +#include "xfs_error.h"
> +#include "xfs_log_priv.h"
> +#include "xfs_log_recover.h"
> +
> +static const struct xfs_item_ops xfs_attri_item_ops;
> +static const struct xfs_item_ops xfs_attrd_item_ops;
> +
> +/* iovec length must be 32-bit aligned */
> +static inline size_t ATTR_NVEC_SIZE(size_t size)
> +{
> +	return size == sizeof(int32_t) ? size :
> +	       sizeof(int32_t) + round_up(size, sizeof(int32_t));
> +}
> +
> +static inline struct xfs_attri_log_item *ATTRI_ITEM(struct xfs_log_item *lip)
> +{
> +	return container_of(lip, struct xfs_attri_log_item, attri_item);
> +}
> +
> +STATIC void
> +xfs_attri_item_free(
> +	struct xfs_attri_log_item	*attrip)
> +{
> +	kmem_free(attrip->attri_item.li_lv_shadow);
> +	kmem_free(attrip);
> +}
> +
> +/*
> + * Freeing the attrip requires that we remove it from the AIL if it has already
> + * been placed there. However, the ATTRI may not yet have been placed in the
> + * AIL when called by xfs_attri_release() from ATTRD processing due to the
> + * ordering of committed vs unpin operations in bulk insert operations. Hence
> + * the reference count to ensure only the last caller frees the ATTRI.
> + */
> +STATIC void
> +xfs_attri_release(
> +	struct xfs_attri_log_item	*attrip)
> +{
> +	ASSERT(atomic_read(&attrip->attri_refcount) > 0);
> +	if (atomic_dec_and_test(&attrip->attri_refcount)) {
> +		xfs_trans_ail_delete(&attrip->attri_item,
> +				     SHUTDOWN_LOG_IO_ERROR);
> +		xfs_attri_item_free(attrip);
> +	}
> +}
> +
> +STATIC void
> +xfs_attri_item_size(
> +	struct xfs_log_item	*lip,
> +	int			*nvecs,
> +	int			*nbytes)
> +{
> +	struct xfs_attri_log_item       *attrip = ATTRI_ITEM(lip);
> +
> +	*nvecs += 1;
> +	*nbytes += sizeof(struct xfs_attri_log_format);
> +
> +	/* Attr set and remove operations require a name */
> +	ASSERT(attrip->attri_name_len > 0);
> +
> +	*nvecs += 1;
> +	*nbytes += ATTR_NVEC_SIZE(attrip->attri_name_len);
> +
> +	/*
> +	 * Set ops can accept a value of 0 len to clear an attr value.  Remove
> +	 * ops do not need a value at all.  So only account for the value

Is this still true now that xfs_attr_set calls xfs_attr_remove_args
if there's no value?  IOWS I think the comment can go away.

> +	 * when it is needed.
> +	 */
> +	if (attrip->attri_value_len > 0) {
> +		*nvecs += 1;
> +		*nbytes += ATTR_NVEC_SIZE(attrip->attri_value_len);
> +	}
> +}
> +
> +/*
> + * This is called to fill in the log iovecs for the given attri log
> + * item. We use  1 iovec for the attri_format_item, 1 for the name, and
> + * another for the value if it is present
> + */
> +STATIC void
> +xfs_attri_item_format(
> +	struct xfs_log_item	*lip,
> +	struct xfs_log_vec	*lv)
> +{
> +	struct xfs_attri_log_item	*attrip = ATTRI_ITEM(lip);
> +	struct xfs_log_iovec		*vecp = NULL;
> +
> +	attrip->attri_format.alfi_type = XFS_LI_ATTRI;
> +	attrip->attri_format.alfi_size = 1;
> +
> +	/*
> +	 * This size accounting must be done before copying the attrip into the
> +	 * iovec.  If we do it after, the wrong size will be recorded to the log
> +	 * and we trip across assertion checks for bad region sizes later during
> +	 * the log recovery.
> +	 */
> +
> +	ASSERT(attrip->attri_name_len > 0);
> +	attrip->attri_format.alfi_size++;
> +
> +	if (attrip->attri_value_len > 0)
> +		attrip->attri_format.alfi_size++;
> +
> +	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ATTRI_FORMAT,
> +			&attrip->attri_format,
> +			sizeof(struct xfs_attri_log_format));
> +	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ATTR_NAME,
> +			attrip->attri_name,
> +			ATTR_NVEC_SIZE(attrip->attri_name_len));
> +	if (attrip->attri_value_len > 0)
> +		xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ATTR_VALUE,
> +				attrip->attri_value,
> +				ATTR_NVEC_SIZE(attrip->attri_value_len));
> +}
> +
> +/*
> + * The unpin operation is the last place an ATTRI is manipulated in the log. It
> + * is either inserted in the AIL or aborted in the event of a log I/O error. In
> + * either case, the ATTRI transaction has been successfully committed to make
> + * it this far. Therefore, we expect whoever committed the ATTRI to either
> + * construct and commit the ATTRD or drop the ATTRD's reference in the event of
> + * error. Simply drop the log's ATTRI reference now that the log is done with
> + * it.
> + */
> +STATIC void
> +xfs_attri_item_unpin(
> +	struct xfs_log_item	*lip,
> +	int			remove)
> +{
> +	xfs_attri_release(ATTRI_ITEM(lip));
> +}
> +
> +
> +STATIC void
> +xfs_attri_item_release(
> +	struct xfs_log_item	*lip)
> +{
> +	xfs_attri_release(ATTRI_ITEM(lip));
> +}
> +
> +/*
> + * Allocate and initialize an attri item.  Caller may allocate an additional
> + * trailing buffer of the specified size
> + */
> +STATIC struct xfs_attri_log_item *
> +xfs_attri_init(
> +	struct xfs_mount		*mp,
> +	int				buffer_size)
> +
> +{
> +	struct xfs_attri_log_item	*attrip;
> +	uint				size;
> +
> +	size = sizeof(struct xfs_attri_log_item) + buffer_size;
> +	attrip = kmem_alloc_large(size, KM_ZERO);
> +	if (attrip == NULL)
> +		return NULL;
> +
> +	xfs_log_item_init(mp, &attrip->attri_item, XFS_LI_ATTRI,
> +			  &xfs_attri_item_ops);
> +	attrip->attri_format.alfi_id = (uintptr_t)(void *)attrip;
> +	atomic_set(&attrip->attri_refcount, 2);
> +
> +	return attrip;
> +}
> +
> +/*
> + * Copy an attr format buffer from the given buf, and into the destination attr
> + * format structure.
> + */
> +STATIC int
> +xfs_attri_copy_format(
> +	struct xfs_log_iovec		*buf,
> +	struct xfs_attri_log_format	*dst_attr_fmt)
> +{
> +	struct xfs_attri_log_format	*src_attr_fmt = buf->i_addr;
> +	uint				len;
> +
> +	len = sizeof(struct xfs_attri_log_format);
> +	if (buf->i_len != len)
> +		return -EFSCORRUPTED;

This function is involved with log recovery, which means that an
improperly sized buffer really ought to log something in dmesg.

	if (buf->i_len != len) {
		XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, NULL);
		return -EFSCORRUPTED;
	}

> +
> +	memcpy((char *)dst_attr_fmt, (char *)src_attr_fmt, len);
> +	return 0;
> +}
> +
> +static inline struct xfs_attrd_log_item *ATTRD_ITEM(struct xfs_log_item *lip)
> +{
> +	return container_of(lip, struct xfs_attrd_log_item, attrd_item);
> +}
> +
> +STATIC void
> +xfs_attrd_item_free(struct xfs_attrd_log_item *attrdp)
> +{
> +	kmem_free(attrdp->attrd_item.li_lv_shadow);
> +	kmem_free(attrdp);
> +}
> +
> +STATIC void
> +xfs_attrd_item_size(
> +	struct xfs_log_item		*lip,
> +	int				*nvecs,
> +	int				*nbytes)
> +{
> +	*nvecs += 1;
> +	*nbytes += sizeof(struct xfs_attrd_log_format);
> +}
> +
> +/*
> + * This is called to fill in the log iovecs for the given attrd log item. We use
> + * only 1 iovec for the attrd_format, and we point that at the attr_log_format
> + * structure embedded in the attrd item.
> + */
> +STATIC void
> +xfs_attrd_item_format(
> +	struct xfs_log_item	*lip,
> +	struct xfs_log_vec	*lv)
> +{
> +	struct xfs_attrd_log_item	*attrdp = ATTRD_ITEM(lip);
> +	struct xfs_log_iovec		*vecp = NULL;
> +
> +	attrdp->attrd_format.alfd_type = XFS_LI_ATTRD;
> +	attrdp->attrd_format.alfd_size = 1;
> +
> +	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ATTRD_FORMAT,
> +			&attrdp->attrd_format,
> +			sizeof(struct xfs_attrd_log_format));
> +}
> +
> +/*
> + * The ATTRD is either committed or aborted if the transaction is canceled. If
> + * the transaction is canceled, drop our reference to the ATTRI and free the
> + * ATTRD.
> + */
> +STATIC void
> +xfs_attrd_item_release(
> +	struct xfs_log_item		*lip)
> +{
> +	struct xfs_attrd_log_item	*attrdp = ATTRD_ITEM(lip);
> +
> +	xfs_attri_release(attrdp->attrd_attrip);
> +	xfs_attrd_item_free(attrdp);
> +}
> +
> +STATIC xfs_lsn_t
> +xfs_attri_item_committed(
> +	struct xfs_log_item		*lip,
> +	xfs_lsn_t			lsn)
> +{
> +	struct xfs_attri_log_item	*attrip;

	struct xfs_attri_log_item	*attrip = ATTRI_ITEM(lip);

> +	/*

Style nit: blank line after the variable declarations.

> +	 * The attrip refers to xfs_attr_item memory to log the name and value
> +	 * with the intent item. This already occurred when the intent was
> +	 * committed so these fields are no longer accessed. Clear them out of
> +	 * caution since we're about to free the xfs_attr_item.
> +	 */
> +	attrip = ATTRI_ITEM(lip);
> +	attrip->attri_name = NULL;
> +	attrip->attri_value = NULL;

It's been too long since I read this patchset.  Where do these memory
buffers get freed?


> +
> +	/*
> +	 * The ATTRI is logged only once and cannot be moved in the log, so
> +	 * simply return the lsn at which it's been logged.
> +	 */
> +	return lsn;
> +}
> +
> +STATIC bool
> +xfs_attri_item_match(
> +	struct xfs_log_item	*lip,
> +	uint64_t		intent_id)
> +{
> +	return ATTRI_ITEM(lip)->attri_format.alfi_id == intent_id;
> +}
> +
> +static const struct xfs_item_ops xfs_attrd_item_ops = {
> +	.flags		= XFS_ITEM_RELEASE_WHEN_COMMITTED,
> +	.iop_size	= xfs_attrd_item_size,
> +	.iop_format	= xfs_attrd_item_format,
> +	.iop_release    = xfs_attrd_item_release,
> +};
> +
> +/* Is this recovered ATTRI ok? */
> +static inline bool
> +xfs_attri_validate(
> +	struct xfs_mount		*mp,
> +	struct xfs_attri_log_item	*attrip)
> +{
> +	struct xfs_attri_log_format     *attrp = &attrip->attri_format;
> +
> +	/* alfi_op_flags should be either a set or remove */
> +	if (attrp->alfi_op_flags != XFS_ATTR_OP_FLAGS_SET &&
> +	    attrp->alfi_op_flags != XFS_ATTR_OP_FLAGS_REMOVE)

These comparisons ought to be masked so that we don't leave a logic bomb
if someone ever defines a new opflag, e.g.

	unsigned int	op = attrp->alfi_op_flags & XFS_ATTR_OP_FLAGS_MASK;

	if (op != XFS_ATTR_OP_FLAGS_SET && op != XFS_ATTR_OP_FLAGS_REMOVE)
		return false;

> +		return false;
> +
> +	if (attrp->alfi_value_len > XATTR_SIZE_MAX)
> +		return false;
> +
> +	if ((attrp->alfi_name_len > XATTR_NAME_MAX) ||
> +	    (attrp->alfi_name_len == 0))
> +		return false;
> +
> +	if (!xfs_verify_ino(mp, attrp->alfi_ino))
> +		return false;
> +
> +	return xfs_hasdelattr(mp);

Hrmm.  This will cause recovery failures if there's a dirty attri item
in the log but the sysadmin forgets to mount with -o delattr.  That
seems like a bit of a sharp edge, but I guess you're fine with that?

> +}
> +
> +static const struct xfs_item_ops xfs_attri_item_ops = {
> +	.iop_size	= xfs_attri_item_size,
> +	.iop_format	= xfs_attri_item_format,
> +	.iop_unpin	= xfs_attri_item_unpin,
> +	.iop_committed	= xfs_attri_item_committed,
> +	.iop_release    = xfs_attri_item_release,
> +	.iop_match	= xfs_attri_item_match,
> +};
> +
> +
> +
> +STATIC int
> +xlog_recover_attri_commit_pass2(
> +	struct xlog                     *log,
> +	struct list_head		*buffer_list,
> +	struct xlog_recover_item        *item,
> +	xfs_lsn_t                       lsn)
> +{
> +	int                             error;
> +	struct xfs_mount                *mp = log->l_mp;
> +	struct xfs_attri_log_item       *attrip;
> +	struct xfs_attri_log_format     *attri_formatp;
> +	char				*name = NULL;
> +	char				*value = NULL;
> +	int				region = 0;
> +	int				buffer_size;
> +
> +	attri_formatp = item->ri_buf[region].i_addr;
> +
> +	/* Validate xfs_attri_log_format */
> +	if (attri_formatp->__pad != 0 || attri_formatp->alfi_name_len == 0 ||
> +	    (attri_formatp->alfi_op_flags == XFS_ATTR_OP_FLAGS_REMOVE &&
> +	    attri_formatp->alfi_value_len != 0)) {
> +		XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp);
> +		return -EFSCORRUPTED;
> +	}
> +
> +	buffer_size = attri_formatp->alfi_name_len +
> +		      attri_formatp->alfi_value_len;
> +
> +	attrip = xfs_attri_init(mp, buffer_size);
> +	if (attrip == NULL)
> +		return -ENOMEM;
> +
> +	error = xfs_attri_copy_format(&item->ri_buf[region],
> +				      &attrip->attri_format);
> +	if (error) {
> +		xfs_attri_item_free(attrip);
> +		return error;
> +	}
> +
> +	attrip->attri_name_len = attri_formatp->alfi_name_len;
> +	attrip->attri_value_len = attri_formatp->alfi_value_len;
> +	region++;
> +	name = ((char *)attrip) + sizeof(struct xfs_attri_log_item);
> +	memcpy(name, item->ri_buf[region].i_addr, attrip->attri_name_len);
> +	attrip->attri_name = name;
> +
> +	if (attrip->attri_value_len > 0) {
> +		region++;
> +		value = ((char *)attrip) + sizeof(struct xfs_attri_log_item) +
> +			attrip->attri_name_len;
> +		memcpy(value, item->ri_buf[region].i_addr,
> +			attrip->attri_value_len);
> +		attrip->attri_value = value;
> +	}
> +
> +	/*
> +	 * The ATTRI has two references. One for the ATTRD and one for ATTRI to
> +	 * ensure it makes it into the AIL. Insert the ATTRI into the AIL
> +	 * directly and drop the ATTRI reference. Note that
> +	 * xfs_trans_ail_update() drops the AIL lock.
> +	 */
> +	xfs_trans_ail_insert(log->l_ailp, &attrip->attri_item, lsn);
> +	xfs_attri_release(attrip);
> +	return 0;
> +}
> +
> +const struct xlog_recover_item_ops xlog_attri_item_ops = {
> +	.item_type	= XFS_LI_ATTRI,
> +	.commit_pass2	= xlog_recover_attri_commit_pass2,
> +};
> +
> +/*
> + * This routine is called when an ATTRD format structure is found in a committed
> + * transaction in the log. Its purpose is to cancel the corresponding ATTRI if
> + * it was still in the log. To do this it searches the AIL for the ATTRI with
> + * an id equal to that in the ATTRD format structure. If we find it we drop
> + * the ATTRD reference, which removes the ATTRI from the AIL and frees it.
> + */
> +STATIC int
> +xlog_recover_attrd_commit_pass2(
> +	struct xlog			*log,
> +	struct list_head		*buffer_list,
> +	struct xlog_recover_item	*item,
> +	xfs_lsn_t			lsn)
> +{
> +	struct xfs_attrd_log_format	*attrd_formatp;
> +
> +	attrd_formatp = item->ri_buf[0].i_addr;
> +	ASSERT((item->ri_buf[0].i_len ==
> +				(sizeof(struct xfs_attrd_log_format))));

This is metadata corruption, please XFS_ERROR_REPORT() and return
-EFSCORRUPTED, since this fails silently on non-debug kernels.

> +
> +	xlog_recover_release_intent(log, XFS_LI_ATTRI,
> +				    attrd_formatp->alfd_alf_id);
> +	return 0;
> +}
> +
> +const struct xlog_recover_item_ops xlog_attrd_item_ops = {
> +	.item_type	= XFS_LI_ATTRD,
> +	.commit_pass2	= xlog_recover_attrd_commit_pass2,
> +};
> diff --git a/fs/xfs/xfs_attr_item.h b/fs/xfs/xfs_attr_item.h
> new file mode 100644
> index 0000000..594a5dd
> --- /dev/null
> +++ b/fs/xfs/xfs_attr_item.h
> @@ -0,0 +1,52 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later
> + *
> + * Copyright (C) 2019 Oracle.  All Rights Reserved.
> + * Author: Allison Collins <allison.henderson@oracle.com>

Time to update the copyright?

Aside from those nitpicky things, this part looks like it's in fairly
good shape.

--D

> + */
> +#ifndef	__XFS_ATTR_ITEM_H__
> +#define	__XFS_ATTR_ITEM_H__
> +
> +/* kernel only ATTRI/ATTRD definitions */
> +
> +struct xfs_mount;
> +struct kmem_zone;
> +
> +/*
> + * Define ATTR flag bits. Manipulated by set/clear/test_bit operators.
> + */
> +#define	XFS_ATTRI_RECOVERED	1
> +
> +
> +/*
> + * This is the "attr intention" log item.  It is used to log the fact that some
> + * attribute operations need to be processed.  An operation is currently either
> + * a set or remove.  Set or remove operations are described by the xfs_attr_item
> + * which may be logged to this intent.
> + *
> + * During a normal attr operation, name and value point to the name and value
> + * fields of the calling functions xfs_da_args.  During a recovery, the name
> + * and value buffers are copied from the log, and stored in a trailing buffer
> + * attached to the xfs_attr_item until they are committed.  They are freed when
> + * the xfs_attr_item itself is freed when the work is done.
> + */
> +struct xfs_attri_log_item {
> +	struct xfs_log_item		attri_item;
> +	atomic_t			attri_refcount;
> +	int				attri_name_len;
> +	int				attri_value_len;
> +	void				*attri_name;
> +	void				*attri_value;
> +	struct xfs_attri_log_format	attri_format;
> +};
> +
> +/*
> + * This is the "attr done" log item.  It is used to log the fact that some attrs
> + * earlier mentioned in an attri item have been freed.
> + */
> +struct xfs_attrd_log_item {
> +	struct xfs_attri_log_item	*attrd_attrip;
> +	struct xfs_log_item		attrd_item;
> +	struct xfs_attrd_log_format	attrd_format;
> +};
> +
> +#endif	/* __XFS_ATTR_ITEM_H__ */
> diff --git a/fs/xfs/xfs_attr_list.c b/fs/xfs/xfs_attr_list.c
> index 25dcc98..81e167a 100644
> --- a/fs/xfs/xfs_attr_list.c
> +++ b/fs/xfs/xfs_attr_list.c
> @@ -15,6 +15,7 @@
>  #include "xfs_inode.h"
>  #include "xfs_trans.h"
>  #include "xfs_bmap.h"
> +#include "xfs_da_btree.h"
>  #include "xfs_attr.h"
>  #include "xfs_attr_sf.h"
>  #include "xfs_attr_leaf.h"
> diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
> index 0f67943..ff635f9 100644
> --- a/fs/xfs/xfs_ioctl.c
> +++ b/fs/xfs/xfs_ioctl.c
> @@ -15,6 +15,8 @@
>  #include "xfs_iwalk.h"
>  #include "xfs_itable.h"
>  #include "xfs_error.h"
> +#include "xfs_da_format.h"
> +#include "xfs_da_btree.h"
>  #include "xfs_attr.h"
>  #include "xfs_bmap.h"
>  #include "xfs_bmap_util.h"
> diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c
> index e650677..cb9f036 100644
> --- a/fs/xfs/xfs_ioctl32.c
> +++ b/fs/xfs/xfs_ioctl32.c
> @@ -17,6 +17,8 @@
>  #include "xfs_itable.h"
>  #include "xfs_fsops.h"
>  #include "xfs_rtalloc.h"
> +#include "xfs_da_format.h"
> +#include "xfs_da_btree.h"
>  #include "xfs_attr.h"
>  #include "xfs_ioctl.h"
>  #include "xfs_ioctl32.h"
> diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
> index 93c082d..6f15cad 100644
> --- a/fs/xfs/xfs_iops.c
> +++ b/fs/xfs/xfs_iops.c
> @@ -13,6 +13,8 @@
>  #include "xfs_inode.h"
>  #include "xfs_acl.h"
>  #include "xfs_quota.h"
> +#include "xfs_da_format.h"
> +#include "xfs_da_btree.h"
>  #include "xfs_attr.h"
>  #include "xfs_trans.h"
>  #include "xfs_trace.h"
> diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
> index 6ab467b..ef038f0 100644
> --- a/fs/xfs/xfs_log_recover.c
> +++ b/fs/xfs/xfs_log_recover.c
> @@ -1776,6 +1776,8 @@ static const struct xlog_recover_item_ops *xlog_recover_item_ops[] = {
>  	&xlog_cud_item_ops,
>  	&xlog_bui_item_ops,
>  	&xlog_bud_item_ops,
> +	&xlog_attri_item_ops,
> +	&xlog_attrd_item_ops,
>  };
>  
>  static const struct xlog_recover_item_ops *
> diff --git a/fs/xfs/xfs_ondisk.h b/fs/xfs/xfs_ondisk.h
> index 2599192..758702b 100644
> --- a/fs/xfs/xfs_ondisk.h
> +++ b/fs/xfs/xfs_ondisk.h
> @@ -132,6 +132,8 @@ xfs_check_ondisk_structs(void)
>  	XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format,	56);
>  	XFS_CHECK_STRUCT_SIZE(struct xfs_qoff_logformat,	20);
>  	XFS_CHECK_STRUCT_SIZE(struct xfs_trans_header,		16);
> +	XFS_CHECK_STRUCT_SIZE(struct xfs_attri_log_format,	40);
> +	XFS_CHECK_STRUCT_SIZE(struct xfs_attrd_log_format,	16);
>  
>  	/*
>  	 * The v5 superblock format extended several v4 header structures with
> diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
> index 0d050f8..66b334f 100644
> --- a/fs/xfs/xfs_xattr.c
> +++ b/fs/xfs/xfs_xattr.c
> @@ -12,6 +12,7 @@
>  #include "xfs_trans_resv.h"
>  #include "xfs_mount.h"
>  #include "xfs_inode.h"
> +#include "xfs_da_btree.h"
>  #include "xfs_attr.h"
>  #include "xfs_acl.h"
>  #include "xfs_da_btree.h"
> -- 
> 2.7.4
> 

Re: [PATCH v21 06/13] xfs: Implement attr logging and replay

[Darrick J. Wong]

On Wed, Jul 07, 2021 at 03:21:04PM -0700, Allison Henderson wrote:
> This patch adds the needed routines to create, log and replay attr
> intents

I might call that last part "...and recover logged extended attribute
intents."

> 
> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
> ---
>  fs/xfs/libxfs/xfs_defer.c  |   1 +
>  fs/xfs/libxfs/xfs_defer.h  |   1 +
>  fs/xfs/libxfs/xfs_format.h |   4 +-
>  fs/xfs/xfs_attr_item.c     | 394 +++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 399 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_defer.c b/fs/xfs/libxfs/xfs_defer.c
> index eff4a12..e9caff7 100644
> --- a/fs/xfs/libxfs/xfs_defer.c
> +++ b/fs/xfs/libxfs/xfs_defer.c
> @@ -178,6 +178,7 @@ static const struct xfs_defer_op_type *defer_op_types[] = {
>  	[XFS_DEFER_OPS_TYPE_RMAP]	= &xfs_rmap_update_defer_type,
>  	[XFS_DEFER_OPS_TYPE_FREE]	= &xfs_extent_free_defer_type,
>  	[XFS_DEFER_OPS_TYPE_AGFL_FREE]	= &xfs_agfl_free_defer_type,
> +	[XFS_DEFER_OPS_TYPE_ATTR]	= &xfs_attr_defer_type,
>  };
>  
>  static void
> diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
> index 0ed9dfa..72a5789 100644
> --- a/fs/xfs/libxfs/xfs_defer.h
> +++ b/fs/xfs/libxfs/xfs_defer.h
> @@ -19,6 +19,7 @@ enum xfs_defer_ops_type {
>  	XFS_DEFER_OPS_TYPE_RMAP,
>  	XFS_DEFER_OPS_TYPE_FREE,
>  	XFS_DEFER_OPS_TYPE_AGFL_FREE,
> +	XFS_DEFER_OPS_TYPE_ATTR,
>  	XFS_DEFER_OPS_TYPE_MAX,
>  };
>  
> diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
> index 3a4da111..477e815 100644
> --- a/fs/xfs/libxfs/xfs_format.h
> +++ b/fs/xfs/libxfs/xfs_format.h
> @@ -485,7 +485,9 @@ xfs_sb_has_incompat_feature(
>  	return (sbp->sb_features_incompat & feature) != 0;
>  }
>  
> -#define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
> +#define XFS_SB_FEAT_INCOMPAT_LOG_DELATTR   (1 << 0)	/* Delayed Attributes */
> +#define XFS_SB_FEAT_INCOMPAT_LOG_ALL \
> +	(XFS_SB_FEAT_INCOMPAT_LOG_DELATTR)
>  #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN	~XFS_SB_FEAT_INCOMPAT_LOG_ALL
>  static inline bool
>  xfs_sb_has_incompat_log_feature(
> diff --git a/fs/xfs/xfs_attr_item.c b/fs/xfs/xfs_attr_item.c
> index c9033e2..eda6ae3 100644
> --- a/fs/xfs/xfs_attr_item.c
> +++ b/fs/xfs/xfs_attr_item.c
> @@ -282,6 +282,183 @@ xfs_attrd_item_release(
>  	xfs_attrd_item_free(attrdp);
>  }
>  
> +/*
> + * Performs one step of an attribute update intent and marks the attrd item
> + * dirty..  An attr operation may be a set or a remove.  Note that the
> + * transaction is marked dirty regardless of whether the operation succeeds or
> + * fails to support the ATTRI/ATTRD lifecycle rules.
> + */
> +int
> +xfs_trans_attr_finish_update(
> +	struct xfs_delattr_context	*dac,
> +	struct xfs_attrd_log_item	*attrdp,
> +	struct xfs_buf			**leaf_bp,
> +	uint32_t			op_flags)
> +{
> +	struct xfs_da_args		*args = dac->da_args;
> +	int				error;
> +
> +	error = xfs_qm_dqattach_locked(args->dp, 0);

Hmm, this function is called at runtime and recovery time.  It's
/really/ late to be attaching dquots.

OH, this is for the recovery case, isn't it?

Hmm, xfs_attri_item_recover really ought to share the same
iget/dqattach/set-irecovery thing that bmap and swapext use.  I should
really post that cleanup as a patch.

> +	if (error)
> +		return error;
> +
> +	switch (op_flags) {

op_flags ought to be masked with XFS_ATTR_OP_FLAGS_TYPE_MASK.

> +	case XFS_ATTR_OP_FLAGS_SET:
> +		args->op_flags |= XFS_DA_OP_ADDNAME;
> +		error = xfs_attr_set_iter(dac, leaf_bp);
> +		break;
> +	case XFS_ATTR_OP_FLAGS_REMOVE:
> +		ASSERT(XFS_IFORK_Q(args->dp));
> +		error = xfs_attr_remove_iter(dac);
> +		break;
> +	default:
> +		error = -EFSCORRUPTED;
> +		break;
> +	}
> +
> +	/*
> +	 * Mark the transaction dirty, even on error. This ensures the
> +	 * transaction is aborted, which:
> +	 *
> +	 * 1.) releases the ATTRI and frees the ATTRD
> +	 * 2.) shuts down the filesystem
> +	 */
> +	args->trans->t_flags |= XFS_TRANS_DIRTY;
> +
> +	/*
> +	 * attr intent/done items are null when delayed attributes are disabled
> +	 */
> +	if (attrdp)
> +		set_bit(XFS_LI_DIRTY, &attrdp->attrd_item.li_flags);
> +
> +	return error;
> +}
> +
> +/* Log an attr to the intent item. */
> +STATIC void
> +xfs_attr_log_item(
> +	struct xfs_trans		*tp,
> +	struct xfs_attri_log_item	*attrip,
> +	struct xfs_attr_item		*attr)
> +{
> +	struct xfs_attri_log_format	*attrp;
> +
> +	tp->t_flags |= XFS_TRANS_DIRTY;
> +	set_bit(XFS_LI_DIRTY, &attrip->attri_item.li_flags);
> +
> +	/*
> +	 * At this point the xfs_attr_item has been constructed, and we've
> +	 * created the log intent. Fill in the attri log item and log format
> +	 * structure with fields from this xfs_attr_item
> +	 */
> +	attrp = &attrip->attri_format;
> +	attrp->alfi_ino = attr->xattri_dac.da_args->dp->i_ino;
> +	attrp->alfi_op_flags = attr->xattri_op_flags;
> +	attrp->alfi_value_len = attr->xattri_dac.da_args->valuelen;
> +	attrp->alfi_name_len = attr->xattri_dac.da_args->namelen;
> +	attrp->alfi_attr_flags = attr->xattri_dac.da_args->attr_filter;
> +
> +	attrip->attri_name = (void *)attr->xattri_dac.da_args->name;
> +	attrip->attri_value = attr->xattri_dac.da_args->value;
> +	attrip->attri_name_len = attr->xattri_dac.da_args->namelen;
> +	attrip->attri_value_len = attr->xattri_dac.da_args->valuelen;
> +}
> +
> +/* Get an ATTRI. */
> +static struct xfs_log_item *
> +xfs_attr_create_intent(
> +	struct xfs_trans		*tp,
> +	struct list_head		*items,
> +	unsigned int			count,
> +	bool				sort)
> +{
> +	struct xfs_mount		*mp = tp->t_mountp;
> +	struct xfs_attri_log_item	*attrip;
> +	struct xfs_attr_item		*attr;
> +
> +	ASSERT(count == 1);
> +
> +	if (!xfs_hasdelattr(mp))
> +		return NULL;
> +
> +	xfs_sb_add_incompat_log_features(&mp->m_sb,
> +					 XFS_SB_FEAT_INCOMPAT_LOG_DELATTR);

Um, I think I see a bug here--

I don't see anything in this series that calls xfs_add_incompat_log_feature.

Adding a log incompat feature on a filesystem is a tricky dance, because
one has to write the primary superblock (which means logging the sb
change, forcing the log, and pushing the AIL) /before/ logging the intent.

All this is to prevent an old kernel from tripping over a logged item
that it doesn't understand, because an earlier recovered transaction
contained the bit it needed to conclude that it shouldn't have tried to
recover.


/*
 * Get permission to use log-assisted atomic exchange of file extents.
 *
 * Callers must not be running any transactions or hold any inode locks, and
 * they must release the permission by calling xlog_drop_incompat_feat
 * when they're done.
 */
int
xfs_attr_use_log_assist(
	struct xfs_mount	*mp)
{
	int			error = 0;

	/*
	 * Protect ourselves from an idle log clearing the logged xattrs
	 * log incompat feature bit.
	 */
	xlog_use_incompat_feat(mp->m_log);

	/*
	 * If log-assisted xattrs are already enabled, the caller can use the
	 * log assisted swap functions with the log-incompat reference we got.
	 */
	if (xfs_sb_version_hasdelattr(&mp->m_sb))
		return 0;

	/* Enable log-assisted xattrs. */
	xfs_warn_once(mp,
 "EXPERIMENTAL logged extended attributes feature added. Use at your own risk!");
	error = xfs_add_incompat_log_feature(mp,
			XFS_SB_FEAT_INCOMPAT_LOG_DELATTR);
	if (error)
		goto drop_incompat;

	return 0;
drop_incompat:
	xlog_drop_incompat_feat(mp->m_log);
	return error;
}

...and then in xfs_attr_set, you need something like:

	/* Signal the log that we want to use logged xattrs. */
	use_log_items = xfs_hasdelattr(mp);
	if (use_log_items) {
		error = xfs_attr_use_log_assist(mp);
		if (error)
			goto barf;
	}

	error = xfs_trans_alloc(..., &tp);

	if (valuelen > 0)
		error = xfs_attr_set_args(...);
	else
		error = xfs_attr_remove_args(...);

	error = xfs_trans_commit(...);

	/* Signal the log that we're done with using logged xattrs. */
	if (use_log_items)
		xlog_drop_incompat_feat(mp->m_log);

The xfs_add_incompat_log_feature function ensures that the log has been
pushed out to disk and that the ondisk primary superblock has been
written (manually!) with the new incompat feature set.  The
xlog_use_incompat_feat prevents the log from clearing the feature bit
until we're done using it.

Once xfs_attr_use_log_assist completes, we know that it is safe to begin
using deferred xattrs, because there's no possible way that an old
kernel can screw things up.

> +
> +	attrip = xfs_attri_init(mp, 0);
> +	if (attrip == NULL)
> +		return NULL;
> +
> +	xfs_trans_add_item(tp, &attrip->attri_item);
> +	list_for_each_entry(attr, items, xattri_list)
> +		xfs_attr_log_item(tp, attrip, attr);
> +	return &attrip->attri_item;
> +}
> +
> +/* Process an attr. */
> +STATIC int
> +xfs_attr_finish_item(
> +	struct xfs_trans		*tp,
> +	struct xfs_log_item		*done,
> +	struct list_head		*item,
> +	struct xfs_btree_cur		**state)
> +{
> +	struct xfs_attr_item		*attr;
> +	struct xfs_attrd_log_item	*done_item = NULL;
> +	int				error;
> +	struct xfs_delattr_context	*dac;
> +
> +	attr = container_of(item, struct xfs_attr_item, xattri_list);
> +	dac = &attr->xattri_dac;
> +	if (done)
> +		done_item = ATTRD_ITEM(done);
> +
> +	/*
> +	 * Corner case that can happen during a recovery.  Because the first
> +	 * iteration of a multi part delay op happens in xfs_attri_item_recover
> +	 * to maintain the order of the log replay items.  But the new
> +	 * transactions do not automatically rejoin during a recovery as they do
> +	 * in a standard delay op, so we need to catch this here and rejoin the
> +	 * leaf to the new transaction
> +	 */
> +	if (attr->xattri_dac.leaf_bp &&
> +	    attr->xattri_dac.leaf_bp->b_transp != tp) {
> +		xfs_trans_bjoin(tp, attr->xattri_dac.leaf_bp);
> +		xfs_trans_bhold(tp, attr->xattri_dac.leaf_bp);
> +	}
> +
> +	/*
> +	 * Always reset trans after EAGAIN cycle
> +	 * since the transaction is new
> +	 */
> +	dac->da_args->trans = tp;
> +
> +	error = xfs_trans_attr_finish_update(dac, done_item, &dac->leaf_bp,
> +					     attr->xattri_op_flags);
> +	if (error != -EAGAIN)
> +		kmem_free(attr);
> +
> +	return error;
> +}
> +
> +/* Abort all pending ATTRs. */
> +STATIC void
> +xfs_attr_abort_intent(
> +	struct xfs_log_item		*intent)
> +{
> +	xfs_attri_release(ATTRI_ITEM(intent));
> +}
> +
> +/* Cancel an attr */
> +STATIC void
> +xfs_attr_cancel_item(
> +	struct list_head		*item)
> +{
> +	struct xfs_attr_item		*attr;
> +
> +	attr = container_of(item, struct xfs_attr_item, xattri_list);
> +	kmem_free(attr);
> +}
> +
>  STATIC xfs_lsn_t
>  xfs_attri_item_committed(
>  	struct xfs_log_item		*lip,
> @@ -313,6 +490,30 @@ xfs_attri_item_match(
>  	return ATTRI_ITEM(lip)->attri_format.alfi_id == intent_id;
>  }
>  
> +/*
> + * This routine is called to allocate an "attr free done" log item.
> + */
> +struct xfs_attrd_log_item *
> +xfs_trans_get_attrd(struct xfs_trans		*tp,
> +		  struct xfs_attri_log_item	*attrip)
> +{
> +	struct xfs_attrd_log_item		*attrdp;
> +	uint					size;
> +
> +	ASSERT(tp != NULL);
> +
> +	size = sizeof(struct xfs_attrd_log_item);
> +	attrdp = kmem_zalloc(size, 0);
> +
> +	xfs_log_item_init(tp->t_mountp, &attrdp->attrd_item, XFS_LI_ATTRD,
> +			  &xfs_attrd_item_ops);
> +	attrdp->attrd_attrip = attrip;
> +	attrdp->attrd_format.alfd_alf_id = attrip->attri_format.alfi_id;
> +
> +	xfs_trans_add_item(tp, &attrdp->attrd_item);
> +	return attrdp;
> +}
> +
>  static const struct xfs_item_ops xfs_attrd_item_ops = {
>  	.flags		= XFS_ITEM_RELEASE_WHEN_COMMITTED,
>  	.iop_size	= xfs_attrd_item_size,
> @@ -320,6 +521,29 @@ static const struct xfs_item_ops xfs_attrd_item_ops = {
>  	.iop_release    = xfs_attrd_item_release,
>  };
>  
> +
> +/* Get an ATTRD so we can process all the attrs. */
> +static struct xfs_log_item *
> +xfs_attr_create_done(
> +	struct xfs_trans		*tp,
> +	struct xfs_log_item		*intent,
> +	unsigned int			count)
> +{
> +	if (!intent)
> +		return NULL;
> +
> +	return &xfs_trans_get_attrd(tp, ATTRI_ITEM(intent))->attrd_item;
> +}
> +
> +const struct xfs_defer_op_type xfs_attr_defer_type = {
> +	.max_items	= 1,
> +	.create_intent	= xfs_attr_create_intent,
> +	.abort_intent	= xfs_attr_abort_intent,
> +	.create_done	= xfs_attr_create_done,
> +	.finish_item	= xfs_attr_finish_item,
> +	.cancel_item	= xfs_attr_cancel_item,
> +};
> +
>  /* Is this recovered ATTRI ok? */
>  static inline bool
>  xfs_attri_validate(
> @@ -346,13 +570,183 @@ xfs_attri_validate(
>  	return xfs_hasdelattr(mp);
>  }
>  
> +/*
> + * Process an attr intent item that was recovered from the log.  We need to
> + * delete the attr that it describes.
> + */
> +STATIC int
> +xfs_attri_item_recover(
> +	struct xfs_log_item		*lip,
> +	struct list_head		*capture_list)
> +{
> +	struct xfs_attri_log_item	*attrip = ATTRI_ITEM(lip);
> +	struct xfs_attr_item		*new_attr;
> +	struct xfs_mount		*mp = lip->li_mountp;
> +	struct xfs_inode		*ip;
> +	struct xfs_da_args		args;
> +	struct xfs_da_args		*new_args;
> +	struct xfs_trans_res		tres;
> +	bool				rsvd;
> +	struct xfs_attri_log_format	*attrp;
> +	int				error;
> +	int				total;
> +	int				local;
> +	struct xfs_attrd_log_item	*done_item = NULL;
> +	struct xfs_attr_item		attr = {
> +		.xattri_op_flags	= attrip->attri_format.alfi_op_flags,
> +		.xattri_dac.da_args	= &args,
> +	};
> +
> +	/*
> +	 * First check the validity of the attr described by the ATTRI.  If any
> +	 * are bad, then assume that all are bad and just toss the ATTRI.
> +	 */
> +	attrp = &attrip->attri_format;
> +	if (!xfs_attri_validate(mp, attrip))
> +		return -EFSCORRUPTED;
> +

Everything from here...

> +	error = xfs_iget(mp, 0, attrp->alfi_ino, 0, 0, &ip);
> +	if (error)
> +		return error;
> +
> +	if (VFS_I(ip)->i_nlink == 0)
> +		xfs_iflags_set(ip, XFS_IRECOVERY);

...to here should be a call to xlog_recover_iget(), which is in this
patch:

https://djwong.org/docs/kernel/171-xfs-log-recovery-refactor-iget.patch

> +
> +	memset(&args, 0, sizeof(struct xfs_da_args));
> +	args.dp = ip;
> +	args.geo = mp->m_attr_geo;
> +	args.op_flags = attrp->alfi_op_flags;
> +	args.whichfork = XFS_ATTR_FORK;
> +	args.name = attrip->attri_name;
> +	args.namelen = attrp->alfi_name_len;
> +	args.hashval = xfs_da_hashname(args.name, args.namelen);
> +	args.attr_filter = attrp->alfi_attr_flags;
> +
> +	if (attrp->alfi_op_flags == XFS_ATTR_OP_FLAGS_SET) {
> +		args.value = attrip->attri_value;
> +		args.valuelen = attrp->alfi_value_len;
> +		args.total = xfs_attr_calc_size(&args, &local);
> +
> +		tres.tr_logres = M_RES(mp)->tr_attrsetm.tr_logres +
> +				 M_RES(mp)->tr_attrsetrt.tr_logres *
> +					args.total;
> +		tres.tr_logcount = XFS_ATTRSET_LOG_COUNT;
> +		tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
> +		total = args.total;
> +	} else {
> +		tres = M_RES(mp)->tr_attrrm;
> +		total = XFS_ATTRRM_SPACE_RES(mp);
> +	}
> +	error = xfs_trans_alloc(mp, &tres, total, 0,
> +				rsvd ? XFS_TRANS_RESERVE : 0, &args.trans);
> +	if (error)
> +		return error;
> +
> +	done_item = xfs_trans_get_attrd(args.trans, attrip);
> +
> +	xfs_ilock(ip, XFS_ILOCK_EXCL);
> +	xfs_trans_ijoin(args.trans, ip, 0);
> +
> +	error = xfs_trans_attr_finish_update(&attr.xattri_dac, done_item,
> +					     &attr.xattri_dac.leaf_bp,
> +					     attrp->alfi_op_flags);
> +	if (error == -EAGAIN) {
> +		/*
> +		 * There's more work to do, so make a new xfs_attr_item and add
> +		 * it to this transaction.  We don't use xfs_attr_item_init here
> +		 * because we need the info stored in the current attr to
> +		 * continue with this multi-part operation.  So, alloc space
> +		 * for it and the args and copy everything there.
> +		 */
> +		new_attr = kmem_zalloc(sizeof(struct xfs_attr_item) +
> +				       sizeof(struct xfs_da_args), KM_NOFS);
> +		new_args = (struct xfs_da_args *)((char *)new_attr +
> +			   sizeof(struct xfs_attr_item));
> +
> +		memcpy(new_args, &args, sizeof(struct xfs_da_args));
> +		memcpy(new_attr, &attr, sizeof(struct xfs_attr_item));
> +
> +		new_attr->xattri_dac.da_args = new_args;
> +		memset(&new_attr->xattri_list, 0, sizeof(struct list_head));
> +
> +		xfs_defer_add(args.trans, XFS_DEFER_OPS_TYPE_ATTR,
> +			      &new_attr->xattri_list);

Rather than allocating a huge struct xfs_attr_item (aka the incore state
tracking mechanism) on the stack, filling it out, and copying it if
there's more work to do, why not kmem_zalloc it from the start, and
either attach it to the transaction if there's more work to do, or free
it if (unlikely) we actually finished the xattr update?

> +
> +		/* Do not send -EAGAIN back to caller */
> +		error = 0;
> +	} else if (error) {
> +		xfs_trans_cancel(args.trans);
> +		goto out;
> +	}
> +
> +	xfs_defer_ops_capture_and_commit(args.trans, ip, capture_list);

No error checking here?

--D

> +
> +out:
> +	xfs_iunlock(ip, XFS_ILOCK_EXCL);
> +	xfs_irele(ip);
> +	return error;
> +}
> +
> +/* Re-log an intent item to push the log tail forward. */
> +static struct xfs_log_item *
> +xfs_attri_item_relog(
> +	struct xfs_log_item		*intent,
> +	struct xfs_trans		*tp)
> +{
> +	struct xfs_attrd_log_item	*attrdp;
> +	struct xfs_attri_log_item	*old_attrip;
> +	struct xfs_attri_log_item	*new_attrip;
> +	struct xfs_attri_log_format	*new_attrp;
> +	struct xfs_attri_log_format	*old_attrp;
> +	int				buffer_size;
> +
> +	old_attrip = ATTRI_ITEM(intent);
> +	old_attrp = &old_attrip->attri_format;
> +	buffer_size = old_attrp->alfi_value_len + old_attrp->alfi_name_len;
> +
> +	tp->t_flags |= XFS_TRANS_DIRTY;
> +	attrdp = xfs_trans_get_attrd(tp, old_attrip);
> +	set_bit(XFS_LI_DIRTY, &attrdp->attrd_item.li_flags);
> +
> +	new_attrip = xfs_attri_init(tp->t_mountp, buffer_size);
> +	new_attrp = &new_attrip->attri_format;
> +
> +	new_attrp->alfi_ino = old_attrp->alfi_ino;
> +	new_attrp->alfi_op_flags = old_attrp->alfi_op_flags;
> +	new_attrp->alfi_value_len = old_attrp->alfi_value_len;
> +	new_attrp->alfi_name_len = old_attrp->alfi_name_len;
> +	new_attrp->alfi_attr_flags = old_attrp->alfi_attr_flags;
> +
> +	new_attrip->attri_name_len = old_attrip->attri_name_len;
> +	new_attrip->attri_name = ((char *)new_attrip) +
> +				 sizeof(struct xfs_attri_log_item);
> +	memcpy(new_attrip->attri_name, old_attrip->attri_name,
> +		new_attrip->attri_name_len);
> +
> +	new_attrip->attri_value_len = old_attrip->attri_value_len;
> +	if (new_attrip->attri_value_len > 0) {
> +		new_attrip->attri_value = new_attrip->attri_name +
> +					  new_attrip->attri_name_len;
> +
> +		memcpy(new_attrip->attri_value, old_attrip->attri_value,
> +		       new_attrip->attri_value_len);
> +	}
> +
> +	xfs_trans_add_item(tp, &new_attrip->attri_item);
> +	set_bit(XFS_LI_DIRTY, &new_attrip->attri_item.li_flags);
> +
> +	return &new_attrip->attri_item;
> +}
> +
>  static const struct xfs_item_ops xfs_attri_item_ops = {
>  	.iop_size	= xfs_attri_item_size,
>  	.iop_format	= xfs_attri_item_format,
>  	.iop_unpin	= xfs_attri_item_unpin,
>  	.iop_committed	= xfs_attri_item_committed,
>  	.iop_release    = xfs_attri_item_release,
> +	.iop_recover	= xfs_attri_item_recover,
>  	.iop_match	= xfs_attri_item_match,
> +	.iop_relog	= xfs_attri_item_relog,
>  };
>  
>  
> -- 
> 2.7.4
> 

Re: [PATCH v21 05/13] xfs: Set up infrastructure for deferred attribute operations

[Allison Henderson]

On 7/9/21 5:39 PM, Darrick J. Wong wrote:
> On Wed, Jul 07, 2021 at 03:21:03PM -0700, Allison Henderson wrote:
>> Currently attributes are modified directly across one or more
>> transactions. But they are not logged or replayed in the event of an
>> error. The goal of delayed attributes is to enable logging and replaying
>> of attribute operations using the existing delayed operations
>> infrastructure.  This will later enable the attributes to become part of
>> larger multi part operations that also must first be recorded to the
>> log.  This is mostly of interest in the scheme of parent pointers which
>> would need to maintain an attribute containing parent inode information
>> any time an inode is moved, created, or removed.  Parent pointers would
>> then be of interest to any feature that would need to quickly derive an
>> inode path from the mount point. Online scrub, nfs lookups and fs grow
>> or shrink operations are all features that could take advantage of this.
>>
>> This patch adds two new log item types for setting or removing
>> attributes as deferred operations.  The xfs_attri_log_item will log an
>> intent to set or remove an attribute.  The corresponding
>> xfs_attrd_log_item holds a reference to the xfs_attri_log_item and is
>> freed once the transaction is done.  Both log items use a generic
>> xfs_attr_log_format structure that contains the attribute name, value,
>> flags, inode, and an op_flag that indicates if the operations is a set
>> or remove.
>>
>> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
>> ---
>>   fs/xfs/Makefile                 |   1 +
>>   fs/xfs/libxfs/xfs_attr.c        |   5 +-
>>   fs/xfs/libxfs/xfs_attr.h        |  31 +++
>>   fs/xfs/libxfs/xfs_defer.h       |   2 +
>>   fs/xfs/libxfs/xfs_log_format.h  |  44 +++-
>>   fs/xfs/libxfs/xfs_log_recover.h |   2 +
>>   fs/xfs/scrub/common.c           |   2 +
>>   fs/xfs/xfs_acl.c                |   2 +
>>   fs/xfs/xfs_attr_item.c          | 460 ++++++++++++++++++++++++++++++++++++++++
>>   fs/xfs/xfs_attr_item.h          |  52 +++++
>>   fs/xfs/xfs_attr_list.c          |   1 +
>>   fs/xfs/xfs_ioctl.c              |   2 +
>>   fs/xfs/xfs_ioctl32.c            |   2 +
>>   fs/xfs/xfs_iops.c               |   2 +
>>   fs/xfs/xfs_log_recover.c        |   2 +
>>   fs/xfs/xfs_ondisk.h             |   2 +
>>   fs/xfs/xfs_xattr.c              |   1 +
>>   17 files changed, 608 insertions(+), 5 deletions(-)
>>
>> diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
>> index 04611a1..b056cfc 100644
>> --- a/fs/xfs/Makefile
>> +++ b/fs/xfs/Makefile
>> @@ -102,6 +102,7 @@ xfs-y				+= xfs_log.o \
>>   				   xfs_buf_item_recover.o \
>>   				   xfs_dquot_item_recover.o \
>>   				   xfs_extfree_item.o \
>> +				   xfs_attr_item.o \
>>   				   xfs_icreate_item.o \
>>   				   xfs_inode_item.o \
>>   				   xfs_inode_item_recover.o \
>> diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
>> index 8d51607..bdcdadc 100644
>> --- a/fs/xfs/libxfs/xfs_attr.c
>> +++ b/fs/xfs/libxfs/xfs_attr.c
>> @@ -24,6 +24,7 @@
>>   #include "xfs_quota.h"
>>   #include "xfs_trans_space.h"
>>   #include "xfs_trace.h"
>> +#include "xfs_attr_item.h"
>>   
>>   /*
>>    * xfs_attr.c
>> @@ -61,8 +62,6 @@ STATIC int xfs_attr_node_hasname(xfs_da_args_t *args,
>>   				 struct xfs_da_state **state);
>>   STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
>>   STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
>> -STATIC int xfs_attr_set_iter(struct xfs_delattr_context *dac,
>> -			     struct xfs_buf **leaf_bp);
>>   STATIC int xfs_attr_node_removename(struct xfs_da_args *args,
>>   				    struct xfs_da_state *state);
>>   
>> @@ -166,7 +165,7 @@ xfs_attr_get(
>>   /*
>>    * Calculate how many blocks we need for the new attribute,
>>    */
>> -STATIC int
>> +int
>>   xfs_attr_calc_size(
>>   	struct xfs_da_args	*args,
>>   	int			*local)
>> diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
>> index 8de5d1d..4ee5165 100644
>> --- a/fs/xfs/libxfs/xfs_attr.h
>> +++ b/fs/xfs/libxfs/xfs_attr.h
>> @@ -28,6 +28,11 @@ struct xfs_attr_list_context;
>>    */
>>   #define	ATTR_MAX_VALUELEN	(64*1024)	/* max length of a value */
>>   
>> +static inline bool xfs_hasdelattr(struct xfs_mount *mp)
>> +{
>> +	return false;
>> +}
>> +
>>   /*
>>    * Kernel-internal version of the attrlist cursor.
>>    */
>> @@ -454,6 +459,7 @@ enum xfs_delattr_state {
>>    */
>>   #define XFS_DAC_DEFER_FINISH		0x01 /* finish the transaction */
>>   #define XFS_DAC_LEAF_ADDNAME_INIT	0x02 /* xfs_attr_leaf_addname init*/
>> +#define XFS_DAC_DELAYED_OP_INIT		0x04 /* delayed operations init*/
>>   
>>   /*
>>    * Context used for keeping track of delayed attribute operations
>> @@ -461,6 +467,11 @@ enum xfs_delattr_state {
>>   struct xfs_delattr_context {
>>   	struct xfs_da_args      *da_args;
>>   
>> +	/*
>> +	 * Used by xfs_attr_set to hold a leaf buffer across a transaction roll
>> +	 */
>> +	struct xfs_buf		*leaf_bp;
>> +
>>   	/* Used in xfs_attr_rmtval_set_blk to roll through allocating blocks */
>>   	struct xfs_bmbt_irec	map;
>>   	xfs_dablk_t		lblkno;
>> @@ -474,6 +485,23 @@ struct xfs_delattr_context {
>>   	enum xfs_delattr_state  dela_state;
>>   };
>>   
>> +/*
>> + * List of attrs to commit later.
>> + */
>> +struct xfs_attr_item {
>> +	struct xfs_delattr_context	xattri_dac;
>> +
>> +	/*
>> +	 * Indicates if the attr operation is a set or a remove
>> +	 * XFS_ATTR_OP_FLAGS_{SET,REMOVE}
>> +	 */
>> +	uint32_t			xattri_op_flags;
> 
> This could be a regular unsigned int.
Sure, will fix
> 
>> +
>> +	/* used to log this item to an intent */
>> +	struct list_head		xattri_list;
>> +};
>> +
>> +
>>   /*========================================================================
>>    * Function prototypes for the kernel.
>>    *========================================================================*/
>> @@ -490,11 +518,14 @@ int xfs_attr_get_ilocked(struct xfs_da_args *args);
>>   int xfs_attr_get(struct xfs_da_args *args);
>>   int xfs_attr_set(struct xfs_da_args *args);
>>   int xfs_attr_set_args(struct xfs_da_args *args);
>> +int xfs_attr_set_iter(struct xfs_delattr_context *dac,
>> +		      struct xfs_buf **leaf_bp);
>>   int xfs_has_attr(struct xfs_da_args *args);
>>   int xfs_attr_remove_args(struct xfs_da_args *args);
>>   int xfs_attr_remove_iter(struct xfs_delattr_context *dac);
>>   bool xfs_attr_namecheck(const void *name, size_t length);
>>   void xfs_delattr_context_init(struct xfs_delattr_context *dac,
>>   			      struct xfs_da_args *args);
>> +int xfs_attr_calc_size(struct xfs_da_args *args, int *local);
>>   
>>   #endif	/* __XFS_ATTR_H__ */
>> diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
>> index 05472f7..0ed9dfa 100644
>> --- a/fs/xfs/libxfs/xfs_defer.h
>> +++ b/fs/xfs/libxfs/xfs_defer.h
>> @@ -63,6 +63,8 @@ extern const struct xfs_defer_op_type xfs_refcount_update_defer_type;
>>   extern const struct xfs_defer_op_type xfs_rmap_update_defer_type;
>>   extern const struct xfs_defer_op_type xfs_extent_free_defer_type;
>>   extern const struct xfs_defer_op_type xfs_agfl_free_defer_type;
>> +extern const struct xfs_defer_op_type xfs_attr_defer_type;
>> +
>>   
>>   /*
>>    * This structure enables a dfops user to detach the chain of deferred
>> diff --git a/fs/xfs/libxfs/xfs_log_format.h b/fs/xfs/libxfs/xfs_log_format.h
>> index 78d5368..34011c8 100644
>> --- a/fs/xfs/libxfs/xfs_log_format.h
>> +++ b/fs/xfs/libxfs/xfs_log_format.h
>> @@ -113,7 +113,12 @@ struct xfs_unmount_log_format {
>>   #define XLOG_REG_TYPE_CUD_FORMAT	24
>>   #define XLOG_REG_TYPE_BUI_FORMAT	25
>>   #define XLOG_REG_TYPE_BUD_FORMAT	26
>> -#define XLOG_REG_TYPE_MAX		26
>> +#define XLOG_REG_TYPE_ATTRI_FORMAT	27
>> +#define XLOG_REG_TYPE_ATTRD_FORMAT	28
>> +#define XLOG_REG_TYPE_ATTR_NAME	29
>> +#define XLOG_REG_TYPE_ATTR_VALUE	30
>> +#define XLOG_REG_TYPE_MAX		30
>> +
>>   
>>   /*
>>    * Flags to log operation header
>> @@ -236,6 +241,8 @@ typedef struct xfs_trans_header {
>>   #define	XFS_LI_CUD		0x1243
>>   #define	XFS_LI_BUI		0x1244	/* bmbt update intent */
>>   #define	XFS_LI_BUD		0x1245
>> +#define	XFS_LI_ATTRI		0x1246  /* attr set/remove intent*/
>> +#define	XFS_LI_ATTRD		0x1247  /* attr set/remove done */
>>   
>>   #define XFS_LI_TYPE_DESC \
>>   	{ XFS_LI_EFI,		"XFS_LI_EFI" }, \
>> @@ -251,7 +258,9 @@ typedef struct xfs_trans_header {
>>   	{ XFS_LI_CUI,		"XFS_LI_CUI" }, \
>>   	{ XFS_LI_CUD,		"XFS_LI_CUD" }, \
>>   	{ XFS_LI_BUI,		"XFS_LI_BUI" }, \
>> -	{ XFS_LI_BUD,		"XFS_LI_BUD" }
>> +	{ XFS_LI_BUD,		"XFS_LI_BUD" }, \
>> +	{ XFS_LI_ATTRI,		"XFS_LI_ATTRI" }, \
>> +	{ XFS_LI_ATTRD,		"XFS_LI_ATTRD" }
>>   
>>   /*
>>    * Inode Log Item Format definitions.
>> @@ -859,4 +868,35 @@ struct xfs_icreate_log {
>>   	__be32		icl_gen;	/* inode generation number to use */
>>   };
>>   
>> +/*
>> + * Flags for deferred attribute operations.
>> + * Upper bits are flags, lower byte is type code
>> + */
>> +#define XFS_ATTR_OP_FLAGS_SET		1	/* Set the attribute */
>> +#define XFS_ATTR_OP_FLAGS_REMOVE	2	/* Remove the attribute */
>> +#define XFS_ATTR_OP_FLAGS_TYPE_MASK	0x0FF	/* Flags type mask */
> 
> 0xFF, not 0x0FF?
> 
>> +
>> +/*
>> + * This is the structure used to lay out an attr log item in the
>> + * log.
>> + */
>> +struct xfs_attri_log_format {
>> +	uint16_t	alfi_type;	/* attri log item type */
>> +	uint16_t	alfi_size;	/* size of this item */
>> +	uint32_t	__pad;		/* pad to 64 bit aligned */
>> +	uint64_t	alfi_id;	/* attri identifier */
>> +	uint64_t	alfi_ino;	/* the inode for this attr operation */
>> +	uint32_t	alfi_op_flags;	/* marks the op as a set or remove */
>> +	uint32_t	alfi_name_len;	/* attr name length */
>> +	uint32_t	alfi_value_len;	/* attr value length */
>> +	uint32_t	alfi_attr_flags;/* attr flags */
>> +};
>> +
>> +struct xfs_attrd_log_format {
>> +	uint16_t	alfd_type;	/* attrd log item type */
>> +	uint16_t	alfd_size;	/* size of this item */
>> +	uint32_t	__pad;		/* pad to 64 bit aligned */
>> +	uint64_t	alfd_alf_id;	/* id of corresponding attri */
>> +};
>> +
>>   #endif /* __XFS_LOG_FORMAT_H__ */
>> diff --git a/fs/xfs/libxfs/xfs_log_recover.h b/fs/xfs/libxfs/xfs_log_recover.h
>> index 3cca2bf..b6e5514 100644
>> --- a/fs/xfs/libxfs/xfs_log_recover.h
>> +++ b/fs/xfs/libxfs/xfs_log_recover.h
>> @@ -72,6 +72,8 @@ extern const struct xlog_recover_item_ops xlog_rui_item_ops;
>>   extern const struct xlog_recover_item_ops xlog_rud_item_ops;
>>   extern const struct xlog_recover_item_ops xlog_cui_item_ops;
>>   extern const struct xlog_recover_item_ops xlog_cud_item_ops;
>> +extern const struct xlog_recover_item_ops xlog_attri_item_ops;
>> +extern const struct xlog_recover_item_ops xlog_attrd_item_ops;
>>   
>>   /*
>>    * Macros, structures, prototypes for internal log manager use.
>> diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
>> index cadfd57..32e46f8 100644
>> --- a/fs/xfs/scrub/common.c
>> +++ b/fs/xfs/scrub/common.c
>> @@ -23,6 +23,8 @@
>>   #include "xfs_rmap_btree.h"
>>   #include "xfs_log.h"
>>   #include "xfs_trans_priv.h"
>> +#include "xfs_da_format.h"
>> +#include "xfs_da_btree.h"
>>   #include "xfs_attr.h"
>>   #include "xfs_reflink.h"
>>   #include "xfs_ag.h"
>> diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c
>> index d02bef2..b8673c6 100644
>> --- a/fs/xfs/xfs_acl.c
>> +++ b/fs/xfs/xfs_acl.c
>> @@ -10,6 +10,8 @@
>>   #include "xfs_trans_resv.h"
>>   #include "xfs_mount.h"
>>   #include "xfs_inode.h"
>> +#include "xfs_da_format.h"
>> +#include "xfs_da_btree.h"
>>   #include "xfs_attr.h"
>>   #include "xfs_trace.h"
>>   #include "xfs_error.h"
>> diff --git a/fs/xfs/xfs_attr_item.c b/fs/xfs/xfs_attr_item.c
>> new file mode 100644
>> index 0000000..c9033e2
>> --- /dev/null
>> +++ b/fs/xfs/xfs_attr_item.c
>> @@ -0,0 +1,460 @@
>> +// SPDX-License-Identifier: GPL-2.0-or-later
>> +/*
>> + * Copyright (C) 2021 Oracle.  All Rights Reserved.
>> + * Author: Allison Collins <allison.henderson@oracle.com>
>> + */
>> +
>> +#include "xfs.h"
>> +#include "xfs_fs.h"
>> +#include "xfs_format.h"
>> +#include "xfs_log_format.h"
>> +#include "xfs_trans_resv.h"
>> +#include "xfs_bit.h"
>> +#include "xfs_shared.h"
>> +#include "xfs_mount.h"
>> +#include "xfs_defer.h"
>> +#include "xfs_da_format.h"
>> +#include "xfs_log_format.h"
>> +#include "xfs_trans.h"
>> +#include "xfs_bmap.h"
>> +#include "xfs_bmap_btree.h"
>> +#include "xfs_trans_priv.h"
>> +#include "xfs_buf_item.h"
>> +#include "xfs_attr_item.h"
>> +#include "xfs_log.h"
>> +#include "xfs_btree.h"
>> +#include "xfs_rmap.h"
>> +#include "xfs_inode.h"
>> +#include "xfs_icache.h"
>> +#include "xfs_da_format.h"
>> +#include "xfs_da_btree.h"
>> +#include "xfs_attr.h"
>> +#include "xfs_shared.h"
>> +#include "xfs_attr_item.h"
>> +#include "xfs_alloc.h"
>> +#include "xfs_bmap.h"
>> +#include "xfs_trace.h"
>> +#include "libxfs/xfs_da_format.h"
>> +#include "xfs_inode.h"
>> +#include "xfs_quota.h"
>> +#include "xfs_trans_space.h"
>> +#include "xfs_error.h"
>> +#include "xfs_log_priv.h"
>> +#include "xfs_log_recover.h"
>> +
>> +static const struct xfs_item_ops xfs_attri_item_ops;
>> +static const struct xfs_item_ops xfs_attrd_item_ops;
>> +
>> +/* iovec length must be 32-bit aligned */
>> +static inline size_t ATTR_NVEC_SIZE(size_t size)
>> +{
>> +	return size == sizeof(int32_t) ? size :
>> +	       sizeof(int32_t) + round_up(size, sizeof(int32_t));
>> +}
>> +
>> +static inline struct xfs_attri_log_item *ATTRI_ITEM(struct xfs_log_item *lip)
>> +{
>> +	return container_of(lip, struct xfs_attri_log_item, attri_item);
>> +}
>> +
>> +STATIC void
>> +xfs_attri_item_free(
>> +	struct xfs_attri_log_item	*attrip)
>> +{
>> +	kmem_free(attrip->attri_item.li_lv_shadow);
>> +	kmem_free(attrip);
>> +}
>> +
>> +/*
>> + * Freeing the attrip requires that we remove it from the AIL if it has already
>> + * been placed there. However, the ATTRI may not yet have been placed in the
>> + * AIL when called by xfs_attri_release() from ATTRD processing due to the
>> + * ordering of committed vs unpin operations in bulk insert operations. Hence
>> + * the reference count to ensure only the last caller frees the ATTRI.
>> + */
>> +STATIC void
>> +xfs_attri_release(
>> +	struct xfs_attri_log_item	*attrip)
>> +{
>> +	ASSERT(atomic_read(&attrip->attri_refcount) > 0);
>> +	if (atomic_dec_and_test(&attrip->attri_refcount)) {
>> +		xfs_trans_ail_delete(&attrip->attri_item,
>> +				     SHUTDOWN_LOG_IO_ERROR);
>> +		xfs_attri_item_free(attrip);
>> +	}
>> +}
>> +
>> +STATIC void
>> +xfs_attri_item_size(
>> +	struct xfs_log_item	*lip,
>> +	int			*nvecs,
>> +	int			*nbytes)
>> +{
>> +	struct xfs_attri_log_item       *attrip = ATTRI_ITEM(lip);
>> +
>> +	*nvecs += 1;
>> +	*nbytes += sizeof(struct xfs_attri_log_format);
>> +
>> +	/* Attr set and remove operations require a name */
>> +	ASSERT(attrip->attri_name_len > 0);
>> +
>> +	*nvecs += 1;
>> +	*nbytes += ATTR_NVEC_SIZE(attrip->attri_name_len);
>> +
>> +	/*
>> +	 * Set ops can accept a value of 0 len to clear an attr value.  Remove
>> +	 * ops do not need a value at all.  So only account for the value
> 
> Is this still true now that xfs_attr_set calls xfs_attr_remove_args
> if there's no value?  IOWS I think the comment can go away.
> 
Yes, I think people are used to that interface now, so will remove this line

>> +	 * when it is needed.
>> +	 */
>> +	if (attrip->attri_value_len > 0) {
>> +		*nvecs += 1;
>> +		*nbytes += ATTR_NVEC_SIZE(attrip->attri_value_len);
>> +	}
>> +}
>> +
>> +/*
>> + * This is called to fill in the log iovecs for the given attri log
>> + * item. We use  1 iovec for the attri_format_item, 1 for the name, and
>> + * another for the value if it is present
>> + */
>> +STATIC void
>> +xfs_attri_item_format(
>> +	struct xfs_log_item	*lip,
>> +	struct xfs_log_vec	*lv)
>> +{
>> +	struct xfs_attri_log_item	*attrip = ATTRI_ITEM(lip);
>> +	struct xfs_log_iovec		*vecp = NULL;
>> +
>> +	attrip->attri_format.alfi_type = XFS_LI_ATTRI;
>> +	attrip->attri_format.alfi_size = 1;
>> +
>> +	/*
>> +	 * This size accounting must be done before copying the attrip into the
>> +	 * iovec.  If we do it after, the wrong size will be recorded to the log
>> +	 * and we trip across assertion checks for bad region sizes later during
>> +	 * the log recovery.
>> +	 */
>> +
>> +	ASSERT(attrip->attri_name_len > 0);
>> +	attrip->attri_format.alfi_size++;
>> +
>> +	if (attrip->attri_value_len > 0)
>> +		attrip->attri_format.alfi_size++;
>> +
>> +	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ATTRI_FORMAT,
>> +			&attrip->attri_format,
>> +			sizeof(struct xfs_attri_log_format));
>> +	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ATTR_NAME,
>> +			attrip->attri_name,
>> +			ATTR_NVEC_SIZE(attrip->attri_name_len));
>> +	if (attrip->attri_value_len > 0)
>> +		xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ATTR_VALUE,
>> +				attrip->attri_value,
>> +				ATTR_NVEC_SIZE(attrip->attri_value_len));
>> +}
>> +
>> +/*
>> + * The unpin operation is the last place an ATTRI is manipulated in the log. It
>> + * is either inserted in the AIL or aborted in the event of a log I/O error. In
>> + * either case, the ATTRI transaction has been successfully committed to make
>> + * it this far. Therefore, we expect whoever committed the ATTRI to either
>> + * construct and commit the ATTRD or drop the ATTRD's reference in the event of
>> + * error. Simply drop the log's ATTRI reference now that the log is done with
>> + * it.
>> + */
>> +STATIC void
>> +xfs_attri_item_unpin(
>> +	struct xfs_log_item	*lip,
>> +	int			remove)
>> +{
>> +	xfs_attri_release(ATTRI_ITEM(lip));
>> +}
>> +
>> +
>> +STATIC void
>> +xfs_attri_item_release(
>> +	struct xfs_log_item	*lip)
>> +{
>> +	xfs_attri_release(ATTRI_ITEM(lip));
>> +}
>> +
>> +/*
>> + * Allocate and initialize an attri item.  Caller may allocate an additional
>> + * trailing buffer of the specified size
>> + */
>> +STATIC struct xfs_attri_log_item *
>> +xfs_attri_init(
>> +	struct xfs_mount		*mp,
>> +	int				buffer_size)
>> +
>> +{
>> +	struct xfs_attri_log_item	*attrip;
>> +	uint				size;
>> +
>> +	size = sizeof(struct xfs_attri_log_item) + buffer_size;
>> +	attrip = kmem_alloc_large(size, KM_ZERO);
>> +	if (attrip == NULL)
>> +		return NULL;
>> +
>> +	xfs_log_item_init(mp, &attrip->attri_item, XFS_LI_ATTRI,
>> +			  &xfs_attri_item_ops);
>> +	attrip->attri_format.alfi_id = (uintptr_t)(void *)attrip;
>> +	atomic_set(&attrip->attri_refcount, 2);
>> +
>> +	return attrip;
>> +}
>> +
>> +/*
>> + * Copy an attr format buffer from the given buf, and into the destination attr
>> + * format structure.
>> + */
>> +STATIC int
>> +xfs_attri_copy_format(
>> +	struct xfs_log_iovec		*buf,
>> +	struct xfs_attri_log_format	*dst_attr_fmt)
>> +{
>> +	struct xfs_attri_log_format	*src_attr_fmt = buf->i_addr;
>> +	uint				len;
>> +
>> +	len = sizeof(struct xfs_attri_log_format);
>> +	if (buf->i_len != len)
>> +		return -EFSCORRUPTED;
> 
> This function is involved with log recovery, which means that an
> improperly sized buffer really ought to log something in dmesg.
> 
> 	if (buf->i_len != len) {
> 		XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, NULL);
> 		return -EFSCORRUPTED;
> 	}
> 
Ok, will add

>> +
>> +	memcpy((char *)dst_attr_fmt, (char *)src_attr_fmt, len);
>> +	return 0;
>> +}
>> +
>> +static inline struct xfs_attrd_log_item *ATTRD_ITEM(struct xfs_log_item *lip)
>> +{
>> +	return container_of(lip, struct xfs_attrd_log_item, attrd_item);
>> +}
>> +
>> +STATIC void
>> +xfs_attrd_item_free(struct xfs_attrd_log_item *attrdp)
>> +{
>> +	kmem_free(attrdp->attrd_item.li_lv_shadow);
>> +	kmem_free(attrdp);
>> +}
>> +
>> +STATIC void
>> +xfs_attrd_item_size(
>> +	struct xfs_log_item		*lip,
>> +	int				*nvecs,
>> +	int				*nbytes)
>> +{
>> +	*nvecs += 1;
>> +	*nbytes += sizeof(struct xfs_attrd_log_format);
>> +}
>> +
>> +/*
>> + * This is called to fill in the log iovecs for the given attrd log item. We use
>> + * only 1 iovec for the attrd_format, and we point that at the attr_log_format
>> + * structure embedded in the attrd item.
>> + */
>> +STATIC void
>> +xfs_attrd_item_format(
>> +	struct xfs_log_item	*lip,
>> +	struct xfs_log_vec	*lv)
>> +{
>> +	struct xfs_attrd_log_item	*attrdp = ATTRD_ITEM(lip);
>> +	struct xfs_log_iovec		*vecp = NULL;
>> +
>> +	attrdp->attrd_format.alfd_type = XFS_LI_ATTRD;
>> +	attrdp->attrd_format.alfd_size = 1;
>> +
>> +	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ATTRD_FORMAT,
>> +			&attrdp->attrd_format,
>> +			sizeof(struct xfs_attrd_log_format));
>> +}
>> +
>> +/*
>> + * The ATTRD is either committed or aborted if the transaction is canceled. If
>> + * the transaction is canceled, drop our reference to the ATTRI and free the
>> + * ATTRD.
>> + */
>> +STATIC void
>> +xfs_attrd_item_release(
>> +	struct xfs_log_item		*lip)
>> +{
>> +	struct xfs_attrd_log_item	*attrdp = ATTRD_ITEM(lip);
>> +
>> +	xfs_attri_release(attrdp->attrd_attrip);
>> +	xfs_attrd_item_free(attrdp);
>> +}
>> +
>> +STATIC xfs_lsn_t
>> +xfs_attri_item_committed(
>> +	struct xfs_log_item		*lip,
>> +	xfs_lsn_t			lsn)
>> +{
>> +	struct xfs_attri_log_item	*attrip;
> 
> 	struct xfs_attri_log_item	*attrip = ATTRI_ITEM(lip);
> 
>> +	/*
> 
> Style nit: blank line after the variable declarations.
ok, will fix nits

> 
>> +	 * The attrip refers to xfs_attr_item memory to log the name and value
>> +	 * with the intent item. This already occurred when the intent was
>> +	 * committed so these fields are no longer accessed. Clear them out of
>> +	 * caution since we're about to free the xfs_attr_item.
>> +	 */
>> +	attrip = ATTRI_ITEM(lip);
>> +	attrip->attri_name = NULL;
>> +	attrip->attri_value = NULL;
> 
> It's been too long since I read this patchset.  Where do these memory
> buffers get freed?
It happens in xfs_attri_release.  The entire log item is freed along 
with a trailing buffer in which name and value are stored.  These 
pointers point to that space, so we dont free them separatly.  There is 
some documentation for this above the xfs_attri_log_item struct


> 
> 
>> +
>> +	/*
>> +	 * The ATTRI is logged only once and cannot be moved in the log, so
>> +	 * simply return the lsn at which it's been logged.
>> +	 */
>> +	return lsn;
>> +}
>> +
>> +STATIC bool
>> +xfs_attri_item_match(
>> +	struct xfs_log_item	*lip,
>> +	uint64_t		intent_id)
>> +{
>> +	return ATTRI_ITEM(lip)->attri_format.alfi_id == intent_id;
>> +}
>> +
>> +static const struct xfs_item_ops xfs_attrd_item_ops = {
>> +	.flags		= XFS_ITEM_RELEASE_WHEN_COMMITTED,
>> +	.iop_size	= xfs_attrd_item_size,
>> +	.iop_format	= xfs_attrd_item_format,
>> +	.iop_release    = xfs_attrd_item_release,
>> +};
>> +
>> +/* Is this recovered ATTRI ok? */
>> +static inline bool
>> +xfs_attri_validate(
>> +	struct xfs_mount		*mp,
>> +	struct xfs_attri_log_item	*attrip)
>> +{
>> +	struct xfs_attri_log_format     *attrp = &attrip->attri_format;
>> +
>> +	/* alfi_op_flags should be either a set or remove */
>> +	if (attrp->alfi_op_flags != XFS_ATTR_OP_FLAGS_SET &&
>> +	    attrp->alfi_op_flags != XFS_ATTR_OP_FLAGS_REMOVE)
> 
> These comparisons ought to be masked so that we don't leave a logic bomb
> if someone ever defines a new opflag, e.g.
> 
> 	unsigned int	op = attrp->alfi_op_flags & XFS_ATTR_OP_FLAGS_MASK;
> 
> 	if (op != XFS_ATTR_OP_FLAGS_SET && op != XFS_ATTR_OP_FLAGS_REMOVE)
> 		return false;
> 
Ok, will update

>> +		return false;
>> +
>> +	if (attrp->alfi_value_len > XATTR_SIZE_MAX)
>> +		return false;
>> +
>> +	if ((attrp->alfi_name_len > XATTR_NAME_MAX) ||
>> +	    (attrp->alfi_name_len == 0))
>> +		return false;
>> +
>> +	if (!xfs_verify_ino(mp, attrp->alfi_ino))
>> +		return false;
>> +
>> +	return xfs_hasdelattr(mp);
> 
> Hrmm.  This will cause recovery failures if there's a dirty attri item
> in the log but the sysadmin forgets to mount with -o delattr.  That
> seems like a bit of a sharp edge, but I guess you're fine with that?

Yes, I figure since we're plumbing in a secret mount option that only 
advanced users are supposed to know about, they should also know to use 
the same option during a recovery.  If I recall correctly, the plan is 
that eventually delayed attrs becomes the norm, so the mount option 
would eventually go away.

> 
>> +}
>> +
>> +static const struct xfs_item_ops xfs_attri_item_ops = {
>> +	.iop_size	= xfs_attri_item_size,
>> +	.iop_format	= xfs_attri_item_format,
>> +	.iop_unpin	= xfs_attri_item_unpin,
>> +	.iop_committed	= xfs_attri_item_committed,
>> +	.iop_release    = xfs_attri_item_release,
>> +	.iop_match	= xfs_attri_item_match,
>> +};
>> +
>> +
>> +
>> +STATIC int
>> +xlog_recover_attri_commit_pass2(
>> +	struct xlog                     *log,
>> +	struct list_head		*buffer_list,
>> +	struct xlog_recover_item        *item,
>> +	xfs_lsn_t                       lsn)
>> +{
>> +	int                             error;
>> +	struct xfs_mount                *mp = log->l_mp;
>> +	struct xfs_attri_log_item       *attrip;
>> +	struct xfs_attri_log_format     *attri_formatp;
>> +	char				*name = NULL;
>> +	char				*value = NULL;
>> +	int				region = 0;
>> +	int				buffer_size;
>> +
>> +	attri_formatp = item->ri_buf[region].i_addr;
>> +
>> +	/* Validate xfs_attri_log_format */
>> +	if (attri_formatp->__pad != 0 || attri_formatp->alfi_name_len == 0 ||
>> +	    (attri_formatp->alfi_op_flags == XFS_ATTR_OP_FLAGS_REMOVE &&
>> +	    attri_formatp->alfi_value_len != 0)) {
>> +		XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp);
>> +		return -EFSCORRUPTED;
>> +	}
>> +
>> +	buffer_size = attri_formatp->alfi_name_len +
>> +		      attri_formatp->alfi_value_len;
>> +
>> +	attrip = xfs_attri_init(mp, buffer_size);
>> +	if (attrip == NULL)
>> +		return -ENOMEM;
>> +
>> +	error = xfs_attri_copy_format(&item->ri_buf[region],
>> +				      &attrip->attri_format);
>> +	if (error) {
>> +		xfs_attri_item_free(attrip);
>> +		return error;
>> +	}
>> +
>> +	attrip->attri_name_len = attri_formatp->alfi_name_len;
>> +	attrip->attri_value_len = attri_formatp->alfi_value_len;
>> +	region++;
>> +	name = ((char *)attrip) + sizeof(struct xfs_attri_log_item);
>> +	memcpy(name, item->ri_buf[region].i_addr, attrip->attri_name_len);
>> +	attrip->attri_name = name;
>> +
>> +	if (attrip->attri_value_len > 0) {
>> +		region++;
>> +		value = ((char *)attrip) + sizeof(struct xfs_attri_log_item) +
>> +			attrip->attri_name_len;
>> +		memcpy(value, item->ri_buf[region].i_addr,
>> +			attrip->attri_value_len);
>> +		attrip->attri_value = value;
>> +	}
>> +
>> +	/*
>> +	 * The ATTRI has two references. One for the ATTRD and one for ATTRI to
>> +	 * ensure it makes it into the AIL. Insert the ATTRI into the AIL
>> +	 * directly and drop the ATTRI reference. Note that
>> +	 * xfs_trans_ail_update() drops the AIL lock.
>> +	 */
>> +	xfs_trans_ail_insert(log->l_ailp, &attrip->attri_item, lsn);
>> +	xfs_attri_release(attrip);
>> +	return 0;
>> +}
>> +
>> +const struct xlog_recover_item_ops xlog_attri_item_ops = {
>> +	.item_type	= XFS_LI_ATTRI,
>> +	.commit_pass2	= xlog_recover_attri_commit_pass2,
>> +};
>> +
>> +/*
>> + * This routine is called when an ATTRD format structure is found in a committed
>> + * transaction in the log. Its purpose is to cancel the corresponding ATTRI if
>> + * it was still in the log. To do this it searches the AIL for the ATTRI with
>> + * an id equal to that in the ATTRD format structure. If we find it we drop
>> + * the ATTRD reference, which removes the ATTRI from the AIL and frees it.
>> + */
>> +STATIC int
>> +xlog_recover_attrd_commit_pass2(
>> +	struct xlog			*log,
>> +	struct list_head		*buffer_list,
>> +	struct xlog_recover_item	*item,
>> +	xfs_lsn_t			lsn)
>> +{
>> +	struct xfs_attrd_log_format	*attrd_formatp;
>> +
>> +	attrd_formatp = item->ri_buf[0].i_addr;
>> +	ASSERT((item->ri_buf[0].i_len ==
>> +				(sizeof(struct xfs_attrd_log_format))));
> 
> This is metadata corruption, please XFS_ERROR_REPORT() and return
> -EFSCORRUPTED, since this fails silently on non-debug kernels.
Sure, will add

> 
>> +
>> +	xlog_recover_release_intent(log, XFS_LI_ATTRI,
>> +				    attrd_formatp->alfd_alf_id);
>> +	return 0;
>> +}
>> +
>> +const struct xlog_recover_item_ops xlog_attrd_item_ops = {
>> +	.item_type	= XFS_LI_ATTRD,
>> +	.commit_pass2	= xlog_recover_attrd_commit_pass2,
>> +};
>> diff --git a/fs/xfs/xfs_attr_item.h b/fs/xfs/xfs_attr_item.h
>> new file mode 100644
>> index 0000000..594a5dd
>> --- /dev/null
>> +++ b/fs/xfs/xfs_attr_item.h
>> @@ -0,0 +1,52 @@
>> +/* SPDX-License-Identifier: GPL-2.0-or-later
>> + *
>> + * Copyright (C) 2019 Oracle.  All Rights Reserved.
>> + * Author: Allison Collins <allison.henderson@oracle.com>
> 
> Time to update the copyright?

Yep, alrighty, thanks for the review!
Allison
> 
> Aside from those nitpicky things, this part looks like it's in fairly
> good shape.
> 
> --D
> 
>> + */
>> +#ifndef	__XFS_ATTR_ITEM_H__
>> +#define	__XFS_ATTR_ITEM_H__
>> +
>> +/* kernel only ATTRI/ATTRD definitions */
>> +
>> +struct xfs_mount;
>> +struct kmem_zone;
>> +
>> +/*
>> + * Define ATTR flag bits. Manipulated by set/clear/test_bit operators.
>> + */
>> +#define	XFS_ATTRI_RECOVERED	1
>> +
>> +
>> +/*
>> + * This is the "attr intention" log item.  It is used to log the fact that some
>> + * attribute operations need to be processed.  An operation is currently either
>> + * a set or remove.  Set or remove operations are described by the xfs_attr_item
>> + * which may be logged to this intent.
>> + *
>> + * During a normal attr operation, name and value point to the name and value
>> + * fields of the calling functions xfs_da_args.  During a recovery, the name
>> + * and value buffers are copied from the log, and stored in a trailing buffer
>> + * attached to the xfs_attr_item until they are committed.  They are freed when
>> + * the xfs_attr_item itself is freed when the work is done.
>> + */
>> +struct xfs_attri_log_item {
>> +	struct xfs_log_item		attri_item;
>> +	atomic_t			attri_refcount;
>> +	int				attri_name_len;
>> +	int				attri_value_len;
>> +	void				*attri_name;
>> +	void				*attri_value;
>> +	struct xfs_attri_log_format	attri_format;
>> +};
>> +
>> +/*
>> + * This is the "attr done" log item.  It is used to log the fact that some attrs
>> + * earlier mentioned in an attri item have been freed.
>> + */
>> +struct xfs_attrd_log_item {
>> +	struct xfs_attri_log_item	*attrd_attrip;
>> +	struct xfs_log_item		attrd_item;
>> +	struct xfs_attrd_log_format	attrd_format;
>> +};
>> +
>> +#endif	/* __XFS_ATTR_ITEM_H__ */
>> diff --git a/fs/xfs/xfs_attr_list.c b/fs/xfs/xfs_attr_list.c
>> index 25dcc98..81e167a 100644
>> --- a/fs/xfs/xfs_attr_list.c
>> +++ b/fs/xfs/xfs_attr_list.c
>> @@ -15,6 +15,7 @@
>>   #include "xfs_inode.h"
>>   #include "xfs_trans.h"
>>   #include "xfs_bmap.h"
>> +#include "xfs_da_btree.h"
>>   #include "xfs_attr.h"
>>   #include "xfs_attr_sf.h"
>>   #include "xfs_attr_leaf.h"
>> diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
>> index 0f67943..ff635f9 100644
>> --- a/fs/xfs/xfs_ioctl.c
>> +++ b/fs/xfs/xfs_ioctl.c
>> @@ -15,6 +15,8 @@
>>   #include "xfs_iwalk.h"
>>   #include "xfs_itable.h"
>>   #include "xfs_error.h"
>> +#include "xfs_da_format.h"
>> +#include "xfs_da_btree.h"
>>   #include "xfs_attr.h"
>>   #include "xfs_bmap.h"
>>   #include "xfs_bmap_util.h"
>> diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c
>> index e650677..cb9f036 100644
>> --- a/fs/xfs/xfs_ioctl32.c
>> +++ b/fs/xfs/xfs_ioctl32.c
>> @@ -17,6 +17,8 @@
>>   #include "xfs_itable.h"
>>   #include "xfs_fsops.h"
>>   #include "xfs_rtalloc.h"
>> +#include "xfs_da_format.h"
>> +#include "xfs_da_btree.h"
>>   #include "xfs_attr.h"
>>   #include "xfs_ioctl.h"
>>   #include "xfs_ioctl32.h"
>> diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
>> index 93c082d..6f15cad 100644
>> --- a/fs/xfs/xfs_iops.c
>> +++ b/fs/xfs/xfs_iops.c
>> @@ -13,6 +13,8 @@
>>   #include "xfs_inode.h"
>>   #include "xfs_acl.h"
>>   #include "xfs_quota.h"
>> +#include "xfs_da_format.h"
>> +#include "xfs_da_btree.h"
>>   #include "xfs_attr.h"
>>   #include "xfs_trans.h"
>>   #include "xfs_trace.h"
>> diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
>> index 6ab467b..ef038f0 100644
>> --- a/fs/xfs/xfs_log_recover.c
>> +++ b/fs/xfs/xfs_log_recover.c
>> @@ -1776,6 +1776,8 @@ static const struct xlog_recover_item_ops *xlog_recover_item_ops[] = {
>>   	&xlog_cud_item_ops,
>>   	&xlog_bui_item_ops,
>>   	&xlog_bud_item_ops,
>> +	&xlog_attri_item_ops,
>> +	&xlog_attrd_item_ops,
>>   };
>>   
>>   static const struct xlog_recover_item_ops *
>> diff --git a/fs/xfs/xfs_ondisk.h b/fs/xfs/xfs_ondisk.h
>> index 2599192..758702b 100644
>> --- a/fs/xfs/xfs_ondisk.h
>> +++ b/fs/xfs/xfs_ondisk.h
>> @@ -132,6 +132,8 @@ xfs_check_ondisk_structs(void)
>>   	XFS_CHECK_STRUCT_SIZE(struct xfs_inode_log_format,	56);
>>   	XFS_CHECK_STRUCT_SIZE(struct xfs_qoff_logformat,	20);
>>   	XFS_CHECK_STRUCT_SIZE(struct xfs_trans_header,		16);
>> +	XFS_CHECK_STRUCT_SIZE(struct xfs_attri_log_format,	40);
>> +	XFS_CHECK_STRUCT_SIZE(struct xfs_attrd_log_format,	16);
>>   
>>   	/*
>>   	 * The v5 superblock format extended several v4 header structures with
>> diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
>> index 0d050f8..66b334f 100644
>> --- a/fs/xfs/xfs_xattr.c
>> +++ b/fs/xfs/xfs_xattr.c
>> @@ -12,6 +12,7 @@
>>   #include "xfs_trans_resv.h"
>>   #include "xfs_mount.h"
>>   #include "xfs_inode.h"
>> +#include "xfs_da_btree.h"
>>   #include "xfs_attr.h"
>>   #include "xfs_acl.h"
>>   #include "xfs_da_btree.h"
>> -- 
>> 2.7.4
>>

Re: [PATCH v21 06/13] xfs: Implement attr logging and replay

[Allison Henderson]

On 7/9/21 6:08 PM, Darrick J. Wong wrote:
> On Wed, Jul 07, 2021 at 03:21:04PM -0700, Allison Henderson wrote:
>> This patch adds the needed routines to create, log and replay attr
>> intents
> 
> I might call that last part "...and recover logged extended attribute
> intents."
Sure, will update the commit message here

> 
>>
>> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
>> ---
>>   fs/xfs/libxfs/xfs_defer.c  |   1 +
>>   fs/xfs/libxfs/xfs_defer.h  |   1 +
>>   fs/xfs/libxfs/xfs_format.h |   4 +-
>>   fs/xfs/xfs_attr_item.c     | 394 +++++++++++++++++++++++++++++++++++++++++++++
>>   4 files changed, 399 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/xfs/libxfs/xfs_defer.c b/fs/xfs/libxfs/xfs_defer.c
>> index eff4a12..e9caff7 100644
>> --- a/fs/xfs/libxfs/xfs_defer.c
>> +++ b/fs/xfs/libxfs/xfs_defer.c
>> @@ -178,6 +178,7 @@ static const struct xfs_defer_op_type *defer_op_types[] = {
>>   	[XFS_DEFER_OPS_TYPE_RMAP]	= &xfs_rmap_update_defer_type,
>>   	[XFS_DEFER_OPS_TYPE_FREE]	= &xfs_extent_free_defer_type,
>>   	[XFS_DEFER_OPS_TYPE_AGFL_FREE]	= &xfs_agfl_free_defer_type,
>> +	[XFS_DEFER_OPS_TYPE_ATTR]	= &xfs_attr_defer_type,
>>   };
>>   
>>   static void
>> diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
>> index 0ed9dfa..72a5789 100644
>> --- a/fs/xfs/libxfs/xfs_defer.h
>> +++ b/fs/xfs/libxfs/xfs_defer.h
>> @@ -19,6 +19,7 @@ enum xfs_defer_ops_type {
>>   	XFS_DEFER_OPS_TYPE_RMAP,
>>   	XFS_DEFER_OPS_TYPE_FREE,
>>   	XFS_DEFER_OPS_TYPE_AGFL_FREE,
>> +	XFS_DEFER_OPS_TYPE_ATTR,
>>   	XFS_DEFER_OPS_TYPE_MAX,
>>   };
>>   
>> diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
>> index 3a4da111..477e815 100644
>> --- a/fs/xfs/libxfs/xfs_format.h
>> +++ b/fs/xfs/libxfs/xfs_format.h
>> @@ -485,7 +485,9 @@ xfs_sb_has_incompat_feature(
>>   	return (sbp->sb_features_incompat & feature) != 0;
>>   }
>>   
>> -#define XFS_SB_FEAT_INCOMPAT_LOG_ALL 0
>> +#define XFS_SB_FEAT_INCOMPAT_LOG_DELATTR   (1 << 0)	/* Delayed Attributes */
>> +#define XFS_SB_FEAT_INCOMPAT_LOG_ALL \
>> +	(XFS_SB_FEAT_INCOMPAT_LOG_DELATTR)
>>   #define XFS_SB_FEAT_INCOMPAT_LOG_UNKNOWN	~XFS_SB_FEAT_INCOMPAT_LOG_ALL
>>   static inline bool
>>   xfs_sb_has_incompat_log_feature(
>> diff --git a/fs/xfs/xfs_attr_item.c b/fs/xfs/xfs_attr_item.c
>> index c9033e2..eda6ae3 100644
>> --- a/fs/xfs/xfs_attr_item.c
>> +++ b/fs/xfs/xfs_attr_item.c
>> @@ -282,6 +282,183 @@ xfs_attrd_item_release(
>>   	xfs_attrd_item_free(attrdp);
>>   }
>>   
>> +/*
>> + * Performs one step of an attribute update intent and marks the attrd item
>> + * dirty..  An attr operation may be a set or a remove.  Note that the
>> + * transaction is marked dirty regardless of whether the operation succeeds or
>> + * fails to support the ATTRI/ATTRD lifecycle rules.
>> + */
>> +int
>> +xfs_trans_attr_finish_update(
>> +	struct xfs_delattr_context	*dac,
>> +	struct xfs_attrd_log_item	*attrdp,
>> +	struct xfs_buf			**leaf_bp,
>> +	uint32_t			op_flags)
>> +{
>> +	struct xfs_da_args		*args = dac->da_args;
>> +	int				error;
>> +
>> +	error = xfs_qm_dqattach_locked(args->dp, 0);
> 
> Hmm, this function is called at runtime and recovery time.  It's
> /really/ late to be attaching dquots.
> 
> OH, this is for the recovery case, isn't it?
> 
> Hmm, xfs_attri_item_recover really ought to share the same
> iget/dqattach/set-irecovery thing that bmap and swapext use.  I should
> really post that cleanup as a patch.

Sure, I'll put it on my todo was well, that one I think can happen 
independantly of this set.

> 
>> +	if (error)
>> +		return error;
>> +
>> +	switch (op_flags) {
> 
> op_flags ought to be masked with XFS_ATTR_OP_FLAGS_TYPE_MASK.
Will fix

> 
>> +	case XFS_ATTR_OP_FLAGS_SET:
>> +		args->op_flags |= XFS_DA_OP_ADDNAME;
>> +		error = xfs_attr_set_iter(dac, leaf_bp);
>> +		break;
>> +	case XFS_ATTR_OP_FLAGS_REMOVE:
>> +		ASSERT(XFS_IFORK_Q(args->dp));
>> +		error = xfs_attr_remove_iter(dac);
>> +		break;
>> +	default:
>> +		error = -EFSCORRUPTED;
>> +		break;
>> +	}
>> +
>> +	/*
>> +	 * Mark the transaction dirty, even on error. This ensures the
>> +	 * transaction is aborted, which:
>> +	 *
>> +	 * 1.) releases the ATTRI and frees the ATTRD
>> +	 * 2.) shuts down the filesystem
>> +	 */
>> +	args->trans->t_flags |= XFS_TRANS_DIRTY;
>> +
>> +	/*
>> +	 * attr intent/done items are null when delayed attributes are disabled
>> +	 */
>> +	if (attrdp)
>> +		set_bit(XFS_LI_DIRTY, &attrdp->attrd_item.li_flags);
>> +
>> +	return error;
>> +}
>> +
>> +/* Log an attr to the intent item. */
>> +STATIC void
>> +xfs_attr_log_item(
>> +	struct xfs_trans		*tp,
>> +	struct xfs_attri_log_item	*attrip,
>> +	struct xfs_attr_item		*attr)
>> +{
>> +	struct xfs_attri_log_format	*attrp;
>> +
>> +	tp->t_flags |= XFS_TRANS_DIRTY;
>> +	set_bit(XFS_LI_DIRTY, &attrip->attri_item.li_flags);
>> +
>> +	/*
>> +	 * At this point the xfs_attr_item has been constructed, and we've
>> +	 * created the log intent. Fill in the attri log item and log format
>> +	 * structure with fields from this xfs_attr_item
>> +	 */
>> +	attrp = &attrip->attri_format;
>> +	attrp->alfi_ino = attr->xattri_dac.da_args->dp->i_ino;
>> +	attrp->alfi_op_flags = attr->xattri_op_flags;
>> +	attrp->alfi_value_len = attr->xattri_dac.da_args->valuelen;
>> +	attrp->alfi_name_len = attr->xattri_dac.da_args->namelen;
>> +	attrp->alfi_attr_flags = attr->xattri_dac.da_args->attr_filter;
>> +
>> +	attrip->attri_name = (void *)attr->xattri_dac.da_args->name;
>> +	attrip->attri_value = attr->xattri_dac.da_args->value;
>> +	attrip->attri_name_len = attr->xattri_dac.da_args->namelen;
>> +	attrip->attri_value_len = attr->xattri_dac.da_args->valuelen;
>> +}
>> +
>> +/* Get an ATTRI. */
>> +static struct xfs_log_item *
>> +xfs_attr_create_intent(
>> +	struct xfs_trans		*tp,
>> +	struct list_head		*items,
>> +	unsigned int			count,
>> +	bool				sort)
>> +{
>> +	struct xfs_mount		*mp = tp->t_mountp;
>> +	struct xfs_attri_log_item	*attrip;
>> +	struct xfs_attr_item		*attr;
>> +
>> +	ASSERT(count == 1);
>> +
>> +	if (!xfs_hasdelattr(mp))
>> +		return NULL;
>> +
>> +	xfs_sb_add_incompat_log_features(&mp->m_sb,
>> +					 XFS_SB_FEAT_INCOMPAT_LOG_DELATTR);
> 
> Um, I think I see a bug here--
> 
> I don't see anything in this series that calls xfs_add_incompat_log_feature.
> 
> Adding a log incompat feature on a filesystem is a tricky dance, because
> one has to write the primary superblock (which means logging the sb
> change, forcing the log, and pushing the AIL) /before/ logging the intent.
> 
> All this is to prevent an old kernel from tripping over a logged item
> that it doesn't understand, because an earlier recovered transaction
> contained the bit it needed to conclude that it shouldn't have tried to
> recover.
> 
> 
> /*
>   * Get permission to use log-assisted atomic exchange of file extents.
>   *
>   * Callers must not be running any transactions or hold any inode locks, and
>   * they must release the permission by calling xlog_drop_incompat_feat
>   * when they're done.
>   */
> int
> xfs_attr_use_log_assist(
> 	struct xfs_mount	*mp)
> {
> 	int			error = 0;
> 
> 	/*
> 	 * Protect ourselves from an idle log clearing the logged xattrs
> 	 * log incompat feature bit.
> 	 */
> 	xlog_use_incompat_feat(mp->m_log);
> 
> 	/*
> 	 * If log-assisted xattrs are already enabled, the caller can use the
> 	 * log assisted swap functions with the log-incompat reference we got.
> 	 */
> 	if (xfs_sb_version_hasdelattr(&mp->m_sb))
> 		return 0;
> 
> 	/* Enable log-assisted xattrs. */
> 	xfs_warn_once(mp,
>   "EXPERIMENTAL logged extended attributes feature added. Use at your own risk!");
> 	error = xfs_add_incompat_log_feature(mp,
> 			XFS_SB_FEAT_INCOMPAT_LOG_DELATTR);
> 	if (error)
> 		goto drop_incompat;
> 
> 	return 0;
> drop_incompat:
> 	xlog_drop_incompat_feat(mp->m_log);
> 	return error;
> }
> 
> ...and then in xfs_attr_set, you need something like:
> 
> 	/* Signal the log that we want to use logged xattrs. */
> 	use_log_items = xfs_hasdelattr(mp);
> 	if (use_log_items) {
> 		error = xfs_attr_use_log_assist(mp);
> 		if (error)
> 			goto barf;
> 	}
> 
> 	error = xfs_trans_alloc(..., &tp);
> 
> 	if (valuelen > 0)
> 		error = xfs_attr_set_args(...);
> 	else
> 		error = xfs_attr_remove_args(...);
> 
> 	error = xfs_trans_commit(...);
> 
> 	/* Signal the log that we're done with using logged xattrs. */
> 	if (use_log_items)
> 		xlog_drop_incompat_feat(mp->m_log);
> 
> The xfs_add_incompat_log_feature function ensures that the log has been
> pushed out to disk and that the ondisk primary superblock has been
> written (manually!) with the new incompat feature set.  The
> xlog_use_incompat_feat prevents the log from clearing the feature bit
> until we're done using it.
> 
> Once xfs_attr_use_log_assist completes, we know that it is safe to begin
> using deferred xattrs, because there's no possible way that an old
> kernel can screw things up.
> 
Ah, ok.  I'll see if I can find a place to work that in.  Maybe patch 8 
is a good place to do this since that is where the xfs_attr_set 
modifications happen.


>> +
>> +	attrip = xfs_attri_init(mp, 0);
>> +	if (attrip == NULL)
>> +		return NULL;
>> +
>> +	xfs_trans_add_item(tp, &attrip->attri_item);
>> +	list_for_each_entry(attr, items, xattri_list)
>> +		xfs_attr_log_item(tp, attrip, attr);
>> +	return &attrip->attri_item;
>> +}
>> +
>> +/* Process an attr. */
>> +STATIC int
>> +xfs_attr_finish_item(
>> +	struct xfs_trans		*tp,
>> +	struct xfs_log_item		*done,
>> +	struct list_head		*item,
>> +	struct xfs_btree_cur		**state)
>> +{
>> +	struct xfs_attr_item		*attr;
>> +	struct xfs_attrd_log_item	*done_item = NULL;
>> +	int				error;
>> +	struct xfs_delattr_context	*dac;
>> +
>> +	attr = container_of(item, struct xfs_attr_item, xattri_list);
>> +	dac = &attr->xattri_dac;
>> +	if (done)
>> +		done_item = ATTRD_ITEM(done);
>> +
>> +	/*
>> +	 * Corner case that can happen during a recovery.  Because the first
>> +	 * iteration of a multi part delay op happens in xfs_attri_item_recover
>> +	 * to maintain the order of the log replay items.  But the new
>> +	 * transactions do not automatically rejoin during a recovery as they do
>> +	 * in a standard delay op, so we need to catch this here and rejoin the
>> +	 * leaf to the new transaction
>> +	 */
>> +	if (attr->xattri_dac.leaf_bp &&
>> +	    attr->xattri_dac.leaf_bp->b_transp != tp) {
>> +		xfs_trans_bjoin(tp, attr->xattri_dac.leaf_bp);
>> +		xfs_trans_bhold(tp, attr->xattri_dac.leaf_bp);
>> +	}
>> +
>> +	/*
>> +	 * Always reset trans after EAGAIN cycle
>> +	 * since the transaction is new
>> +	 */
>> +	dac->da_args->trans = tp;
>> +
>> +	error = xfs_trans_attr_finish_update(dac, done_item, &dac->leaf_bp,
>> +					     attr->xattri_op_flags);
>> +	if (error != -EAGAIN)
>> +		kmem_free(attr);
>> +
>> +	return error;
>> +}
>> +
>> +/* Abort all pending ATTRs. */
>> +STATIC void
>> +xfs_attr_abort_intent(
>> +	struct xfs_log_item		*intent)
>> +{
>> +	xfs_attri_release(ATTRI_ITEM(intent));
>> +}
>> +
>> +/* Cancel an attr */
>> +STATIC void
>> +xfs_attr_cancel_item(
>> +	struct list_head		*item)
>> +{
>> +	struct xfs_attr_item		*attr;
>> +
>> +	attr = container_of(item, struct xfs_attr_item, xattri_list);
>> +	kmem_free(attr);
>> +}
>> +
>>   STATIC xfs_lsn_t
>>   xfs_attri_item_committed(
>>   	struct xfs_log_item		*lip,
>> @@ -313,6 +490,30 @@ xfs_attri_item_match(
>>   	return ATTRI_ITEM(lip)->attri_format.alfi_id == intent_id;
>>   }
>>   
>> +/*
>> + * This routine is called to allocate an "attr free done" log item.
>> + */
>> +struct xfs_attrd_log_item *
>> +xfs_trans_get_attrd(struct xfs_trans		*tp,
>> +		  struct xfs_attri_log_item	*attrip)
>> +{
>> +	struct xfs_attrd_log_item		*attrdp;
>> +	uint					size;
>> +
>> +	ASSERT(tp != NULL);
>> +
>> +	size = sizeof(struct xfs_attrd_log_item);
>> +	attrdp = kmem_zalloc(size, 0);
>> +
>> +	xfs_log_item_init(tp->t_mountp, &attrdp->attrd_item, XFS_LI_ATTRD,
>> +			  &xfs_attrd_item_ops);
>> +	attrdp->attrd_attrip = attrip;
>> +	attrdp->attrd_format.alfd_alf_id = attrip->attri_format.alfi_id;
>> +
>> +	xfs_trans_add_item(tp, &attrdp->attrd_item);
>> +	return attrdp;
>> +}
>> +
>>   static const struct xfs_item_ops xfs_attrd_item_ops = {
>>   	.flags		= XFS_ITEM_RELEASE_WHEN_COMMITTED,
>>   	.iop_size	= xfs_attrd_item_size,
>> @@ -320,6 +521,29 @@ static const struct xfs_item_ops xfs_attrd_item_ops = {
>>   	.iop_release    = xfs_attrd_item_release,
>>   };
>>   
>> +
>> +/* Get an ATTRD so we can process all the attrs. */
>> +static struct xfs_log_item *
>> +xfs_attr_create_done(
>> +	struct xfs_trans		*tp,
>> +	struct xfs_log_item		*intent,
>> +	unsigned int			count)
>> +{
>> +	if (!intent)
>> +		return NULL;
>> +
>> +	return &xfs_trans_get_attrd(tp, ATTRI_ITEM(intent))->attrd_item;
>> +}
>> +
>> +const struct xfs_defer_op_type xfs_attr_defer_type = {
>> +	.max_items	= 1,
>> +	.create_intent	= xfs_attr_create_intent,
>> +	.abort_intent	= xfs_attr_abort_intent,
>> +	.create_done	= xfs_attr_create_done,
>> +	.finish_item	= xfs_attr_finish_item,
>> +	.cancel_item	= xfs_attr_cancel_item,
>> +};
>> +
>>   /* Is this recovered ATTRI ok? */
>>   static inline bool
>>   xfs_attri_validate(
>> @@ -346,13 +570,183 @@ xfs_attri_validate(
>>   	return xfs_hasdelattr(mp);
>>   }
>>   
>> +/*
>> + * Process an attr intent item that was recovered from the log.  We need to
>> + * delete the attr that it describes.
>> + */
>> +STATIC int
>> +xfs_attri_item_recover(
>> +	struct xfs_log_item		*lip,
>> +	struct list_head		*capture_list)
>> +{
>> +	struct xfs_attri_log_item	*attrip = ATTRI_ITEM(lip);
>> +	struct xfs_attr_item		*new_attr;
>> +	struct xfs_mount		*mp = lip->li_mountp;
>> +	struct xfs_inode		*ip;
>> +	struct xfs_da_args		args;
>> +	struct xfs_da_args		*new_args;
>> +	struct xfs_trans_res		tres;
>> +	bool				rsvd;
>> +	struct xfs_attri_log_format	*attrp;
>> +	int				error;
>> +	int				total;
>> +	int				local;
>> +	struct xfs_attrd_log_item	*done_item = NULL;
>> +	struct xfs_attr_item		attr = {
>> +		.xattri_op_flags	= attrip->attri_format.alfi_op_flags,
>> +		.xattri_dac.da_args	= &args,
>> +	};
>> +
>> +	/*
>> +	 * First check the validity of the attr described by the ATTRI.  If any
>> +	 * are bad, then assume that all are bad and just toss the ATTRI.
>> +	 */
>> +	attrp = &attrip->attri_format;
>> +	if (!xfs_attri_validate(mp, attrip))
>> +		return -EFSCORRUPTED;
>> +
> 
> Everything from here...
> 
>> +	error = xfs_iget(mp, 0, attrp->alfi_ino, 0, 0, &ip);
>> +	if (error)
>> +		return error;
>> +
>> +	if (VFS_I(ip)->i_nlink == 0)
>> +		xfs_iflags_set(ip, XFS_IRECOVERY);
> 
> ...to here should be a call to xlog_recover_iget(), which is in this
> patch:
> 
> https://djwong.org/docs/kernel/171-xfs-log-recovery-refactor-iget.patch
Alrighty, I will pick up that patch as well and add it to the set

> 
>> +
>> +	memset(&args, 0, sizeof(struct xfs_da_args));
>> +	args.dp = ip;
>> +	args.geo = mp->m_attr_geo;
>> +	args.op_flags = attrp->alfi_op_flags;
>> +	args.whichfork = XFS_ATTR_FORK;
>> +	args.name = attrip->attri_name;
>> +	args.namelen = attrp->alfi_name_len;
>> +	args.hashval = xfs_da_hashname(args.name, args.namelen);
>> +	args.attr_filter = attrp->alfi_attr_flags;
>> +
>> +	if (attrp->alfi_op_flags == XFS_ATTR_OP_FLAGS_SET) {
>> +		args.value = attrip->attri_value;
>> +		args.valuelen = attrp->alfi_value_len;
>> +		args.total = xfs_attr_calc_size(&args, &local);
>> +
>> +		tres.tr_logres = M_RES(mp)->tr_attrsetm.tr_logres +
>> +				 M_RES(mp)->tr_attrsetrt.tr_logres *
>> +					args.total;
>> +		tres.tr_logcount = XFS_ATTRSET_LOG_COUNT;
>> +		tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
>> +		total = args.total;
>> +	} else {
>> +		tres = M_RES(mp)->tr_attrrm;
>> +		total = XFS_ATTRRM_SPACE_RES(mp);
>> +	}
>> +	error = xfs_trans_alloc(mp, &tres, total, 0,
>> +				rsvd ? XFS_TRANS_RESERVE : 0, &args.trans);
>> +	if (error)
>> +		return error;
>> +
>> +	done_item = xfs_trans_get_attrd(args.trans, attrip);
>> +
>> +	xfs_ilock(ip, XFS_ILOCK_EXCL);
>> +	xfs_trans_ijoin(args.trans, ip, 0);
>> +
>> +	error = xfs_trans_attr_finish_update(&attr.xattri_dac, done_item,
>> +					     &attr.xattri_dac.leaf_bp,
>> +					     attrp->alfi_op_flags);
>> +	if (error == -EAGAIN) {
>> +		/*
>> +		 * There's more work to do, so make a new xfs_attr_item and add
>> +		 * it to this transaction.  We don't use xfs_attr_item_init here
>> +		 * because we need the info stored in the current attr to
>> +		 * continue with this multi-part operation.  So, alloc space
>> +		 * for it and the args and copy everything there.
>> +		 */
>> +		new_attr = kmem_zalloc(sizeof(struct xfs_attr_item) +
>> +				       sizeof(struct xfs_da_args), KM_NOFS);
>> +		new_args = (struct xfs_da_args *)((char *)new_attr +
>> +			   sizeof(struct xfs_attr_item));
>> +
>> +		memcpy(new_args, &args, sizeof(struct xfs_da_args));
>> +		memcpy(new_attr, &attr, sizeof(struct xfs_attr_item));
>> +
>> +		new_attr->xattri_dac.da_args = new_args;
>> +		memset(&new_attr->xattri_list, 0, sizeof(struct list_head));
>> +
>> +		xfs_defer_add(args.trans, XFS_DEFER_OPS_TYPE_ATTR,
>> +			      &new_attr->xattri_list);
> 
> Rather than allocating a huge struct xfs_attr_item (aka the incore state
> tracking mechanism) on the stack, filling it out, and copying it if
> there's more work to do, why not kmem_zalloc it from the start, and
> either attach it to the transaction if there's more work to do, or free
> it if (unlikely) we actually finished the xattr update?
That should work too.  I guess I just assumed people would want to see 
alloc/free minimized if it can be, but most likley there will be some 
back and forth with most attr operations.  will update.

> 
>> +
>> +		/* Do not send -EAGAIN back to caller */
>> +		error = 0;
>> +	} else if (error) {
>> +		xfs_trans_cancel(args.trans);
>> +		goto out;
>> +	}
>> +
>> +	xfs_defer_ops_capture_and_commit(args.trans, ip, capture_list);
> 
> No error checking here?
will fix.

Thanks for the reviews!
Allison

> 
> --D
> 
>> +
>> +out:
>> +	xfs_iunlock(ip, XFS_ILOCK_EXCL);
>> +	xfs_irele(ip);
>> +	return error;
>> +}
>> +
>> +/* Re-log an intent item to push the log tail forward. */
>> +static struct xfs_log_item *
>> +xfs_attri_item_relog(
>> +	struct xfs_log_item		*intent,
>> +	struct xfs_trans		*tp)
>> +{
>> +	struct xfs_attrd_log_item	*attrdp;
>> +	struct xfs_attri_log_item	*old_attrip;
>> +	struct xfs_attri_log_item	*new_attrip;
>> +	struct xfs_attri_log_format	*new_attrp;
>> +	struct xfs_attri_log_format	*old_attrp;
>> +	int				buffer_size;
>> +
>> +	old_attrip = ATTRI_ITEM(intent);
>> +	old_attrp = &old_attrip->attri_format;
>> +	buffer_size = old_attrp->alfi_value_len + old_attrp->alfi_name_len;
>> +
>> +	tp->t_flags |= XFS_TRANS_DIRTY;
>> +	attrdp = xfs_trans_get_attrd(tp, old_attrip);
>> +	set_bit(XFS_LI_DIRTY, &attrdp->attrd_item.li_flags);
>> +
>> +	new_attrip = xfs_attri_init(tp->t_mountp, buffer_size);
>> +	new_attrp = &new_attrip->attri_format;
>> +
>> +	new_attrp->alfi_ino = old_attrp->alfi_ino;
>> +	new_attrp->alfi_op_flags = old_attrp->alfi_op_flags;
>> +	new_attrp->alfi_value_len = old_attrp->alfi_value_len;
>> +	new_attrp->alfi_name_len = old_attrp->alfi_name_len;
>> +	new_attrp->alfi_attr_flags = old_attrp->alfi_attr_flags;
>> +
>> +	new_attrip->attri_name_len = old_attrip->attri_name_len;
>> +	new_attrip->attri_name = ((char *)new_attrip) +
>> +				 sizeof(struct xfs_attri_log_item);
>> +	memcpy(new_attrip->attri_name, old_attrip->attri_name,
>> +		new_attrip->attri_name_len);
>> +
>> +	new_attrip->attri_value_len = old_attrip->attri_value_len;
>> +	if (new_attrip->attri_value_len > 0) {
>> +		new_attrip->attri_value = new_attrip->attri_name +
>> +					  new_attrip->attri_name_len;
>> +
>> +		memcpy(new_attrip->attri_value, old_attrip->attri_value,
>> +		       new_attrip->attri_value_len);
>> +	}
>> +
>> +	xfs_trans_add_item(tp, &new_attrip->attri_item);
>> +	set_bit(XFS_LI_DIRTY, &new_attrip->attri_item.li_flags);
>> +
>> +	return &new_attrip->attri_item;
>> +}
>> +
>>   static const struct xfs_item_ops xfs_attri_item_ops = {
>>   	.iop_size	= xfs_attri_item_size,
>>   	.iop_format	= xfs_attri_item_format,
>>   	.iop_unpin	= xfs_attri_item_unpin,
>>   	.iop_committed	= xfs_attri_item_committed,
>>   	.iop_release    = xfs_attri_item_release,
>> +	.iop_recover	= xfs_attri_item_recover,
>>   	.iop_match	= xfs_attri_item_match,
>> +	.iop_relog	= xfs_attri_item_relog,
>>   };
>>   
>>   
>> -- 
>> 2.7.4
>>