* [PATCH v9 0/5] gfs2 iomap write support
@ 2018-06-15 12:19 ` Andreas Gruenbacher
0 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-15 12:19 UTC (permalink / raw)
To: cluster-devel, Christoph Hellwig; +Cc: linux-fsdevel, Andreas Gruenbacher
Here's another update of my gfs2 iomap write patches on top of:
git://git.infradead.org/users/hch/xfs.git gfs2-iomap
Changes since v8:
* Rebase on top of Christoph's branch.
* New patch to add private pointer to struct iomap.
Changes since v7:
* Drop patch that allows to unconditionally mark the inode dirty in
__generic_write_end and mark the inode dirty in
iomap_write_inline_data instead.
* Call the page_write_end hook even for IOMAP_INLINE mappings.
* Drop patch "iomap: Put struct iomap_ops into struct iomap".
Significant changes since v6:
* Switch to Christoph's patch for splitting out __generic_write_end and
put the inode-dirtying change in a separate commit.
* Switch froma mandatory write_end operation to an optional
page_write_end hook.
* Add a patch to pass struct iomap_ops in struct iomap at the end for
demonstration purposes.
Significant changes since v5:
* Initial gfs2 specific cleanups split off and posted separately.
* New patch for generic iomap inline data handling.
* Iomap write_begin operation removed.
These patches can be found here:
https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git/log/?h=iomap-write
Thanks,
Andreas
Andreas Gruenbacher (5):
iomap: add private pointer to struct iomap
gfs2: iomap buffered write support
gfs2: gfs2_extent_length cleanup
gfs2: iomap direct I/O support
gfs2: Remove gfs2_write_{begin,end}
fs/gfs2/aops.c | 331 ++-------------------------------------
fs/gfs2/aops.h | 22 +++
fs/gfs2/bmap.c | 352 ++++++++++++++++++++++++++++++++++++------
fs/gfs2/file.c | 168 ++++++++++++++++++--
include/linux/iomap.h | 1 +
5 files changed, 500 insertions(+), 374 deletions(-)
create mode 100644 fs/gfs2/aops.h
--
2.17.1
^ permalink raw reply [flat|nested] 22+ messages in thread
* [Cluster-devel] [PATCH v9 0/5] gfs2 iomap write support
@ 2018-06-15 12:19 ` Andreas Gruenbacher
0 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-15 12:19 UTC (permalink / raw)
To: cluster-devel.redhat.com
Here's another update of my gfs2 iomap write patches on top of:
git://git.infradead.org/users/hch/xfs.git gfs2-iomap
Changes since v8:
* Rebase on top of Christoph's branch.
* New patch to add private pointer to struct iomap.
Changes since v7:
* Drop patch that allows to unconditionally mark the inode dirty in
__generic_write_end and mark the inode dirty in
iomap_write_inline_data instead.
* Call the page_write_end hook even for IOMAP_INLINE mappings.
* Drop patch "iomap: Put struct iomap_ops into struct iomap".
Significant changes since v6:
* Switch to Christoph's patch for splitting out __generic_write_end and
put the inode-dirtying change in a separate commit.
* Switch froma mandatory write_end operation to an optional
page_write_end hook.
* Add a patch to pass struct iomap_ops in struct iomap at the end for
demonstration purposes.
Significant changes since v5:
* Initial gfs2 specific cleanups split off and posted separately.
* New patch for generic iomap inline data handling.
* Iomap write_begin operation removed.
These patches can be found here:
https://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git/log/?h=iomap-write
Thanks,
Andreas
Andreas Gruenbacher (5):
iomap: add private pointer to struct iomap
gfs2: iomap buffered write support
gfs2: gfs2_extent_length cleanup
gfs2: iomap direct I/O support
gfs2: Remove gfs2_write_{begin,end}
fs/gfs2/aops.c | 331 ++-------------------------------------
fs/gfs2/aops.h | 22 +++
fs/gfs2/bmap.c | 352 ++++++++++++++++++++++++++++++++++++------
fs/gfs2/file.c | 168 ++++++++++++++++++--
include/linux/iomap.h | 1 +
5 files changed, 500 insertions(+), 374 deletions(-)
create mode 100644 fs/gfs2/aops.h
--
2.17.1
^ permalink raw reply [flat|nested] 22+ messages in thread
* [PATCH v9 1/5] iomap: add private pointer to struct iomap
2018-06-15 12:19 ` [Cluster-devel] " Andreas Gruenbacher
@ 2018-06-15 12:19 ` Andreas Gruenbacher
-1 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-15 12:19 UTC (permalink / raw)
To: cluster-devel, Christoph Hellwig; +Cc: linux-fsdevel, Andreas Gruenbacher
Add a private pointer to struct iomap to allow filesystems to pass data
from iomap_begin to iomap_end. Will be used by gfs2 for passing on the
on-disk inode buffer head.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
include/linux/iomap.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 43cc9208599f..9962dcb836b9 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -59,6 +59,7 @@ struct iomap {
struct dax_device *dax_dev;
void *inline_data;
};
+ void *private; /* filesystem private */
/*
* Called when finished processing a page in the mapping returned in
--
2.17.1
^ permalink raw reply related [flat|nested] 22+ messages in thread
* [Cluster-devel] [PATCH v9 1/5] iomap: add private pointer to struct iomap
@ 2018-06-15 12:19 ` Andreas Gruenbacher
0 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-15 12:19 UTC (permalink / raw)
To: cluster-devel.redhat.com
Add a private pointer to struct iomap to allow filesystems to pass data
from iomap_begin to iomap_end. Will be used by gfs2 for passing on the
on-disk inode buffer head.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
include/linux/iomap.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 43cc9208599f..9962dcb836b9 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -59,6 +59,7 @@ struct iomap {
struct dax_device *dax_dev;
void *inline_data;
};
+ void *private; /* filesystem private */
/*
* Called when finished processing a page in the mapping returned in
--
2.17.1
^ permalink raw reply related [flat|nested] 22+ messages in thread
* [PATCH v9 2/5] gfs2: iomap buffered write support
2018-06-15 12:19 ` [Cluster-devel] " Andreas Gruenbacher
@ 2018-06-15 12:19 ` Andreas Gruenbacher
-1 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-15 12:19 UTC (permalink / raw)
To: cluster-devel, Christoph Hellwig; +Cc: linux-fsdevel, Andreas Gruenbacher
With the traditional page-based writes, blocks are allocated separately
for each page written to. With iomap writes, we can allocate a lot more
blocks at once, with a fraction of the allocation overhead for each
page.
Split calculating the number of blocks that can be allocated at a given
position (gfs2_alloc_size) off from gfs2_iomap_alloc: that size
determines the number of blocks to allocate and reserve in the journal.
In gfs2_iomap_alloc, set the type of newly allocated extents to
IOMAP_MAPPED so that iomap_to_bh will set the bh states correctly:
otherwise, the bhs would not be marked as mapped, confusing
__mpage_writepage. This means that we need to check for the IOMAP_F_NEW
flag in fallocate_chunk now.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/gfs2/aops.c | 20 ++--
fs/gfs2/aops.h | 22 ++++
fs/gfs2/bmap.c | 317 ++++++++++++++++++++++++++++++++++++++++++++-----
fs/gfs2/file.c | 46 +++++--
4 files changed, 359 insertions(+), 46 deletions(-)
create mode 100644 fs/gfs2/aops.h
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 35f5ee23566d..ecfbca9c88ff 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -22,6 +22,7 @@
#include <linux/backing-dev.h>
#include <linux/uio.h>
#include <trace/events/writeback.h>
+#include <linux/sched/signal.h>
#include "gfs2.h"
#include "incore.h"
@@ -36,10 +37,11 @@
#include "super.h"
#include "util.h"
#include "glops.h"
+#include "aops.h"
-static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
- unsigned int from, unsigned int len)
+void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
+ unsigned int from, unsigned int len)
{
struct buffer_head *head = page_buffers(page);
unsigned int bsize = head->b_size;
@@ -462,7 +464,7 @@ static int gfs2_jdata_writepages(struct address_space *mapping,
* Returns: errno
*/
-static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
+int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
{
struct buffer_head *dibh;
u64 dsize = i_size_read(&ip->i_inode);
@@ -776,7 +778,7 @@ static int gfs2_write_begin(struct file *file, struct address_space *mapping,
* adjust_fs_space - Adjusts the free space available due to gfs2_grow
* @inode: the rindex inode
*/
-static void adjust_fs_space(struct inode *inode)
+void adjust_fs_space(struct inode *inode)
{
struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
@@ -822,11 +824,11 @@ static void adjust_fs_space(struct inode *inode)
* This copies the data from the page into the inode block after
* the inode data structure itself.
*
- * Returns: errno
+ * Returns: copied bytes or errno
*/
-static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
- loff_t pos, unsigned copied,
- struct page *page)
+int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
+ loff_t pos, unsigned copied,
+ struct page *page)
{
struct gfs2_inode *ip = GFS2_I(inode);
u64 to = pos + copied;
@@ -865,7 +867,7 @@ static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
* The main write_end function for GFS2. We just put our locking around the VFS
* provided functions.
*
- * Returns: errno
+ * Returns: copied bytes or errno
*/
static int gfs2_write_end(struct file *file, struct address_space *mapping,
diff --git a/fs/gfs2/aops.h b/fs/gfs2/aops.h
new file mode 100644
index 000000000000..976bb32dd405
--- /dev/null
+++ b/fs/gfs2/aops.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2017 Red Hat, Inc. All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License version 2.
+ */
+
+#ifndef __AOPS_DOT_H__
+#define __AOPS_DOT_H__
+
+#include "incore.h"
+
+extern int stuffed_readpage(struct gfs2_inode *ip, struct page *page);
+extern int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
+ loff_t pos, unsigned copied,
+ struct page *page);
+extern void adjust_fs_space(struct inode *inode);
+extern void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
+ unsigned int from, unsigned int len);
+
+#endif /* __AOPS_DOT_H__ */
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index ed6699705c13..704a9150dcbc 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -28,6 +28,7 @@
#include "trans.h"
#include "dir.h"
#include "util.h"
+#include "aops.h"
#include "trace_gfs2.h"
/* This doesn't need to be that large as max 64 bit pointers in a 4k
@@ -41,6 +42,8 @@ struct metapath {
int mp_aheight; /* actual height (lookup height) */
};
+static int punch_hole(struct gfs2_inode *ip, u64 offset, u64 length);
+
/**
* gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page
* @ip: the inode
@@ -389,7 +392,7 @@ static int fillup_metapath(struct gfs2_inode *ip, struct metapath *mp, int h)
return mp->mp_aheight - x - 1;
}
-static inline void release_metapath(struct metapath *mp)
+static void release_metapath(struct metapath *mp)
{
int i;
@@ -397,6 +400,7 @@ static inline void release_metapath(struct metapath *mp)
if (mp->mp_bh[i] == NULL)
break;
brelse(mp->mp_bh[i]);
+ mp->mp_bh[i] = NULL;
}
}
@@ -609,11 +613,13 @@ enum alloc_state {
* ii) Indirect blocks to fill in lower part of the metadata tree
* iii) Data blocks
*
- * The function is in two parts. The first part works out the total
- * number of blocks which we need. The second part does the actual
- * allocation asking for an extent at a time (if enough contiguous free
- * blocks are available, there will only be one request per bmap call)
- * and uses the state machine to initialise the blocks in order.
+ * This function is called after gfs2_iomap_get, which works out the
+ * total number of blocks which we need via gfs2_alloc_size.
+ *
+ * We then do the actual allocation asking for an extent at a time (if
+ * enough contiguous free blocks are available, there will only be one
+ * allocation request per call) and uses the state machine to initialise
+ * the blocks in order.
*
* Right now, this function will allocate at most one indirect block
* worth of data -- with a default block size of 4K, that's slightly
@@ -633,39 +639,26 @@ static int gfs2_iomap_alloc(struct inode *inode, struct iomap *iomap,
struct buffer_head *dibh = mp->mp_bh[0];
u64 bn;
unsigned n, i, blks, alloced = 0, iblks = 0, branch_start = 0;
- unsigned dblks = 0;
- unsigned ptrs_per_blk;
+ size_t dblks = iomap->length >> inode->i_blkbits;
const unsigned end_of_metadata = mp->mp_fheight - 1;
int ret;
enum alloc_state state;
__be64 *ptr;
__be64 zero_bn = 0;
- size_t maxlen = iomap->length >> inode->i_blkbits;
BUG_ON(mp->mp_aheight < 1);
BUG_ON(dibh == NULL);
+ BUG_ON(dblks < 1);
gfs2_trans_add_meta(ip->i_gl, dibh);
down_write(&ip->i_rw_mutex);
if (mp->mp_fheight == mp->mp_aheight) {
- struct buffer_head *bh;
- int eob;
-
- /* Bottom indirect block exists, find unalloced extent size */
- ptr = metapointer(end_of_metadata, mp);
- bh = mp->mp_bh[end_of_metadata];
- dblks = gfs2_extent_length(bh->b_data, bh->b_size, ptr,
- maxlen, &eob);
- BUG_ON(dblks < 1);
+ /* Bottom indirect block exists */
state = ALLOC_DATA;
} else {
/* Need to allocate indirect blocks */
- ptrs_per_blk = mp->mp_fheight > 1 ? sdp->sd_inptrs :
- sdp->sd_diptrs;
- dblks = min(maxlen, (size_t)(ptrs_per_blk -
- mp->mp_list[end_of_metadata]));
if (mp->mp_fheight == ip->i_height) {
/* Writing into existing tree, extend tree down */
iblks = mp->mp_fheight - mp->mp_aheight;
@@ -750,6 +743,7 @@ static int gfs2_iomap_alloc(struct inode *inode, struct iomap *iomap,
}
} while (iomap->addr == IOMAP_NULL_ADDR);
+ iomap->type = IOMAP_MAPPED;
iomap->length = (u64)dblks << inode->i_blkbits;
ip->i_height = mp->mp_fheight;
gfs2_add_inode_blocks(&ip->i_inode, alloced);
@@ -759,19 +753,64 @@ static int gfs2_iomap_alloc(struct inode *inode, struct iomap *iomap,
return ret;
}
-static void gfs2_stuffed_iomap(struct inode *inode, struct iomap *iomap)
+static void gfs2_stuffed_iomap(struct inode *inode, struct iomap *iomap,
+ u64 length)
{
struct gfs2_inode *ip = GFS2_I(inode);
iomap->addr = (ip->i_no_addr << inode->i_blkbits) +
sizeof(struct gfs2_dinode);
iomap->offset = 0;
- iomap->length = i_size_read(inode);
+ iomap->length = length;
iomap->type = IOMAP_INLINE;
}
#define IOMAP_F_GFS2_BOUNDARY IOMAP_F_PRIVATE
+/**
+ * gfs2_alloc_size - Compute the maximum allocation size
+ * @inode: The inode
+ * @mp: The metapath
+ * @size: Requested size in blocks
+ *
+ * Compute the maximum size of the next allocation at @mp.
+ *
+ * Returns: size in blocks
+ */
+static u64 gfs2_alloc_size(struct inode *inode, struct metapath *mp, u64 size)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ const __be64 *first, *ptr, *end;
+
+ /*
+ * For writes to stuffed files, this function is called twice via
+ * gfs2_iomap_get, before and after unstuffing. The size we return the
+ * first time needs to be large enough to get the reservation and
+ * allocation sizes right. The size we return the second time must
+ * be exact or else gfs2_iomap_alloc won't do the right thing.
+ */
+
+ if (gfs2_is_stuffed(ip) || mp->mp_fheight != mp->mp_aheight) {
+ unsigned maxsize = mp->mp_fheight > 1 ?
+ sdp->sd_inptrs : sdp->sd_diptrs;
+ maxsize -= mp->mp_list[mp->mp_fheight - 1];
+ if (size > maxsize)
+ size = maxsize;
+ return size;
+ }
+
+ first = metapointer(ip->i_height - 1, mp);
+ end = metaend(ip->i_height - 1, mp);
+ if (end - first > size)
+ end = first + size;
+ for (ptr = first; ptr < end; ptr++) {
+ if (*ptr)
+ break;
+ }
+ return ptr - first;
+}
+
/**
* gfs2_iomap_get - Map blocks from an inode to disk blocks
* @inode: The inode
@@ -805,10 +844,15 @@ static int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
if (flags & IOMAP_REPORT) {
if (pos >= i_size_read(inode))
return -ENOENT;
- gfs2_stuffed_iomap(inode, iomap);
+ gfs2_stuffed_iomap(inode, iomap,
+ i_size_read(inode));
+ return 0;
+ }
+ if (pos + length <= gfs2_max_stuffed_size(ip)) {
+ gfs2_stuffed_iomap(inode, iomap,
+ gfs2_max_stuffed_size(ip));
return 0;
}
- BUG_ON(!(flags & IOMAP_WRITE));
}
lblock = pos >> inode->i_blkbits;
iomap->offset = lblock << inode->i_blkbits;
@@ -868,10 +912,173 @@ static int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
ret = gfs2_hole_size(inode, lblock, len, mp, iomap);
else
iomap->length = size - pos;
+ } else if (flags & IOMAP_WRITE) {
+ u64 size;
+ size = gfs2_alloc_size(inode, mp, len) << inode->i_blkbits;
+ if (size < iomap->length)
+ iomap->length = size;
+ } else {
+ if (height == ip->i_height)
+ ret = gfs2_hole_size(inode, lblock, len, mp, iomap);
}
goto out;
}
+static int gfs2_write_lock(struct inode *inode)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ int error;
+
+ gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
+ error = gfs2_glock_nq(&ip->i_gh);
+ if (error)
+ goto out_uninit;
+ if (&ip->i_inode == sdp->sd_rindex) {
+ struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
+
+ error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE,
+ GL_NOCACHE, &m_ip->i_gh);
+ if (error)
+ goto out_unlock;
+ }
+ return 0;
+
+out_unlock:
+ gfs2_glock_dq(&ip->i_gh);
+out_uninit:
+ gfs2_holder_uninit(&ip->i_gh);
+ return error;
+}
+
+static void gfs2_write_unlock(struct inode *inode)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+
+ if (&ip->i_inode == sdp->sd_rindex) {
+ struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
+
+ gfs2_glock_dq_uninit(&m_ip->i_gh);
+ }
+ gfs2_glock_dq_uninit(&ip->i_gh);
+}
+
+static void gfs2_iomap_journaled_page_done(struct inode *inode, loff_t pos,
+ unsigned copied, struct page *page,
+ struct iomap *iomap)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+
+ gfs2_page_add_databufs(ip, page, offset_in_page(pos), copied);
+}
+
+static int gfs2_iomap_begin_write(struct inode *inode, loff_t pos, loff_t length,
+ unsigned flags, struct iomap *iomap)
+{
+ struct metapath mp = { .mp_aheight = 1, };
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
+ bool unstuff, alloc_required;
+ struct buffer_head *dibh = NULL;
+ int ret;
+
+ ret = gfs2_write_lock(inode);
+ if (ret)
+ return ret;
+
+ unstuff = gfs2_is_stuffed(ip) &&
+ pos + length > gfs2_max_stuffed_size(ip);
+
+ ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
+ if (ret)
+ goto out_release;
+
+ dibh = mp.mp_bh[0];
+ if (dibh) {
+ get_bh(dibh);
+ } else {
+ ret = gfs2_meta_inode_buffer(ip, &dibh);
+ if (ret)
+ goto out_release;
+ }
+ iomap->private = dibh;
+
+ if (iomap->type == IOMAP_INLINE)
+ iomap->inline_data = dibh->b_data + sizeof(struct gfs2_dinode);
+
+ alloc_required = unstuff || iomap->type == IOMAP_HOLE;
+
+ if (alloc_required || gfs2_is_jdata(ip))
+ gfs2_write_calc_reserv(ip, iomap->length, &data_blocks, &ind_blocks);
+
+ if (alloc_required) {
+ struct gfs2_alloc_parms ap = { .target = data_blocks + ind_blocks };
+ ret = gfs2_quota_lock_check(ip, &ap);
+ if (ret)
+ goto out_release;
+
+ ret = gfs2_inplace_reserve(ip, &ap);
+ if (ret)
+ goto out_qunlock;
+ }
+
+ rblocks = RES_DINODE + ind_blocks;
+ if (gfs2_is_jdata(ip))
+ rblocks += data_blocks;
+ if (ind_blocks || data_blocks)
+ rblocks += RES_STATFS + RES_QUOTA;
+ if (inode == sdp->sd_rindex)
+ rblocks += 2 * RES_STATFS;
+ if (alloc_required)
+ rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
+
+ ret = gfs2_trans_begin(sdp, rblocks, iomap->length >> inode->i_blkbits);
+ if (ret)
+ goto out_trans_fail;
+
+ if (unstuff) {
+ ret = gfs2_unstuff_dinode(ip, NULL);
+ if (ret)
+ goto out_trans_end;
+ release_metapath(&mp);
+ ret = gfs2_iomap_get(inode, iomap->offset, iomap->length,
+ flags, iomap, &mp);
+ if (ret)
+ goto out_trans_end;
+ }
+
+ if (iomap->type == IOMAP_HOLE) {
+ ret = gfs2_iomap_alloc(inode, iomap, flags, &mp);
+ if (ret) {
+ gfs2_trans_end(sdp);
+ gfs2_inplace_release(ip);
+ punch_hole(ip, iomap->offset, iomap->length);
+ goto out_qunlock;
+ }
+ }
+ release_metapath(&mp);
+ if (gfs2_is_jdata(ip))
+ iomap->page_done = gfs2_iomap_journaled_page_done;
+ return 0;
+
+out_trans_end:
+ gfs2_trans_end(sdp);
+out_trans_fail:
+ if (alloc_required)
+ gfs2_inplace_release(ip);
+out_qunlock:
+ if (alloc_required)
+ gfs2_quota_unlock(ip);
+out_release:
+ release_metapath(&mp);
+ if (dibh)
+ brelse(dibh);
+ gfs2_write_unlock(inode);
+ return ret;
+}
+
static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
unsigned flags, struct iomap *iomap)
{
@@ -881,10 +1088,7 @@ static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
trace_gfs2_iomap_start(ip, pos, length, flags);
if (flags & IOMAP_WRITE) {
- ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
- if (!ret && iomap->type == IOMAP_HOLE)
- ret = gfs2_iomap_alloc(inode, iomap, flags, &mp);
- release_metapath(&mp);
+ ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap);
} else {
ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
release_metapath(&mp);
@@ -893,8 +1097,61 @@ static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
return ret;
}
+static int gfs2_iomap_end(struct inode *inode, loff_t pos, loff_t length,
+ ssize_t written, unsigned flags, struct iomap *iomap)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ struct gfs2_trans *tr = current->journal_info;
+ struct buffer_head *dibh;
+
+ if (!(flags & IOMAP_WRITE))
+ return 0;
+
+ dibh = iomap->private;
+ if (iomap->type == IOMAP_INLINE) {
+ gfs2_trans_add_meta(ip->i_gl, dibh);
+ goto out;
+ }
+
+ gfs2_ordered_add_inode(ip);
+
+ if (tr->tr_num_buf_new)
+ __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
+ else {
+ gfs2_trans_add_meta(ip->i_gl, dibh);
+ }
+
+out:
+ brelse(dibh);
+ if (inode == sdp->sd_rindex) {
+ adjust_fs_space(inode);
+ sdp->sd_rindex_uptodate = 0;
+ }
+
+ gfs2_trans_end(sdp);
+ gfs2_inplace_release(ip);
+
+ if (length != written && (iomap->flags & IOMAP_F_NEW)) {
+ /* Deallocate blocks that were just allocated. */
+ loff_t blockmask = i_blocksize(inode) - 1;
+ loff_t end = (pos + length) & ~blockmask;
+ pos = (pos + written + blockmask) & ~blockmask;
+ if (pos < end) {
+ truncate_pagecache_range(inode, pos, end - 1);
+ punch_hole(ip, pos, end - pos);
+ }
+ }
+
+ if (ip->i_qadata && ip->i_qadata->qa_qd_num)
+ gfs2_quota_unlock(ip);
+ gfs2_write_unlock(inode);
+ return 0;
+}
+
const struct iomap_ops gfs2_iomap_ops = {
.iomap_begin = gfs2_iomap_begin,
+ .iomap_end = gfs2_iomap_end,
};
/**
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 7137db7b0119..16dd395479a5 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -26,10 +26,12 @@
#include <linux/dlm.h>
#include <linux/dlm_plock.h>
#include <linux/delay.h>
+#include <linux/backing-dev.h>
#include "gfs2.h"
#include "incore.h"
#include "bmap.h"
+#include "aops.h"
#include "dir.h"
#include "glock.h"
#include "glops.h"
@@ -691,9 +693,7 @@ static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
/**
* gfs2_file_write_iter - Perform a write to a file
* @iocb: The io context
- * @iov: The data to write
- * @nr_segs: Number of @iov segments
- * @pos: The file position
+ * @from: The data to write
*
* We have to do a lock/unlock here to refresh the inode size for
* O_APPEND writes, otherwise we can land up writing at the wrong
@@ -705,8 +705,9 @@ static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
- struct gfs2_inode *ip = GFS2_I(file_inode(file));
- int ret;
+ struct inode *inode = file_inode(file);
+ struct gfs2_inode *ip = GFS2_I(inode);
+ ssize_t ret;
ret = gfs2_rsqa_alloc(ip);
if (ret)
@@ -723,7 +724,38 @@ static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
gfs2_glock_dq_uninit(&gh);
}
- return generic_file_write_iter(iocb, from);
+ if (iocb->ki_flags & IOCB_DIRECT)
+ return generic_file_write_iter(iocb, from);
+
+ inode_lock(inode);
+ ret = generic_write_checks(iocb, from);
+ if (ret <= 0)
+ goto out;
+
+ /* We can write back this queue in page reclaim */
+ current->backing_dev_info = inode_to_bdi(inode);
+
+ ret = file_remove_privs(file);
+ if (ret)
+ goto out2;
+
+ ret = file_update_time(file);
+ if (ret)
+ goto out2;
+
+ ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
+
+out2:
+ current->backing_dev_info = NULL;
+out:
+ inode_unlock(inode);
+ if (likely(ret > 0)) {
+ iocb->ki_pos += ret;
+
+ /* Handle various SYNC-type writes */
+ ret = generic_write_sync(iocb, ret);
+ }
+ return ret;
}
static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
@@ -754,7 +786,7 @@ static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
if (error)
goto out;
offset = iomap.offset + iomap.length;
- if (iomap.type != IOMAP_HOLE)
+ if (!(iomap.flags & IOMAP_F_NEW))
continue;
error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits,
iomap.length >> inode->i_blkbits,
--
2.17.1
^ permalink raw reply related [flat|nested] 22+ messages in thread
* [Cluster-devel] [PATCH v9 2/5] gfs2: iomap buffered write support
@ 2018-06-15 12:19 ` Andreas Gruenbacher
0 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-15 12:19 UTC (permalink / raw)
To: cluster-devel.redhat.com
With the traditional page-based writes, blocks are allocated separately
for each page written to. With iomap writes, we can allocate a lot more
blocks at once, with a fraction of the allocation overhead for each
page.
Split calculating the number of blocks that can be allocated at a given
position (gfs2_alloc_size) off from gfs2_iomap_alloc: that size
determines the number of blocks to allocate and reserve in the journal.
In gfs2_iomap_alloc, set the type of newly allocated extents to
IOMAP_MAPPED so that iomap_to_bh will set the bh states correctly:
otherwise, the bhs would not be marked as mapped, confusing
__mpage_writepage. This means that we need to check for the IOMAP_F_NEW
flag in fallocate_chunk now.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/gfs2/aops.c | 20 ++--
fs/gfs2/aops.h | 22 ++++
fs/gfs2/bmap.c | 317 ++++++++++++++++++++++++++++++++++++++++++++-----
fs/gfs2/file.c | 46 +++++--
4 files changed, 359 insertions(+), 46 deletions(-)
create mode 100644 fs/gfs2/aops.h
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 35f5ee23566d..ecfbca9c88ff 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -22,6 +22,7 @@
#include <linux/backing-dev.h>
#include <linux/uio.h>
#include <trace/events/writeback.h>
+#include <linux/sched/signal.h>
#include "gfs2.h"
#include "incore.h"
@@ -36,10 +37,11 @@
#include "super.h"
#include "util.h"
#include "glops.h"
+#include "aops.h"
-static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
- unsigned int from, unsigned int len)
+void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
+ unsigned int from, unsigned int len)
{
struct buffer_head *head = page_buffers(page);
unsigned int bsize = head->b_size;
@@ -462,7 +464,7 @@ static int gfs2_jdata_writepages(struct address_space *mapping,
* Returns: errno
*/
-static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
+int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
{
struct buffer_head *dibh;
u64 dsize = i_size_read(&ip->i_inode);
@@ -776,7 +778,7 @@ static int gfs2_write_begin(struct file *file, struct address_space *mapping,
* adjust_fs_space - Adjusts the free space available due to gfs2_grow
* @inode: the rindex inode
*/
-static void adjust_fs_space(struct inode *inode)
+void adjust_fs_space(struct inode *inode)
{
struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
@@ -822,11 +824,11 @@ static void adjust_fs_space(struct inode *inode)
* This copies the data from the page into the inode block after
* the inode data structure itself.
*
- * Returns: errno
+ * Returns: copied bytes or errno
*/
-static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
- loff_t pos, unsigned copied,
- struct page *page)
+int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
+ loff_t pos, unsigned copied,
+ struct page *page)
{
struct gfs2_inode *ip = GFS2_I(inode);
u64 to = pos + copied;
@@ -865,7 +867,7 @@ static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
* The main write_end function for GFS2. We just put our locking around the VFS
* provided functions.
*
- * Returns: errno
+ * Returns: copied bytes or errno
*/
static int gfs2_write_end(struct file *file, struct address_space *mapping,
diff --git a/fs/gfs2/aops.h b/fs/gfs2/aops.h
new file mode 100644
index 000000000000..976bb32dd405
--- /dev/null
+++ b/fs/gfs2/aops.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2017 Red Hat, Inc. All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License version 2.
+ */
+
+#ifndef __AOPS_DOT_H__
+#define __AOPS_DOT_H__
+
+#include "incore.h"
+
+extern int stuffed_readpage(struct gfs2_inode *ip, struct page *page);
+extern int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
+ loff_t pos, unsigned copied,
+ struct page *page);
+extern void adjust_fs_space(struct inode *inode);
+extern void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
+ unsigned int from, unsigned int len);
+
+#endif /* __AOPS_DOT_H__ */
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index ed6699705c13..704a9150dcbc 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -28,6 +28,7 @@
#include "trans.h"
#include "dir.h"
#include "util.h"
+#include "aops.h"
#include "trace_gfs2.h"
/* This doesn't need to be that large as max 64 bit pointers in a 4k
@@ -41,6 +42,8 @@ struct metapath {
int mp_aheight; /* actual height (lookup height) */
};
+static int punch_hole(struct gfs2_inode *ip, u64 offset, u64 length);
+
/**
* gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page
* @ip: the inode
@@ -389,7 +392,7 @@ static int fillup_metapath(struct gfs2_inode *ip, struct metapath *mp, int h)
return mp->mp_aheight - x - 1;
}
-static inline void release_metapath(struct metapath *mp)
+static void release_metapath(struct metapath *mp)
{
int i;
@@ -397,6 +400,7 @@ static inline void release_metapath(struct metapath *mp)
if (mp->mp_bh[i] == NULL)
break;
brelse(mp->mp_bh[i]);
+ mp->mp_bh[i] = NULL;
}
}
@@ -609,11 +613,13 @@ enum alloc_state {
* ii) Indirect blocks to fill in lower part of the metadata tree
* iii) Data blocks
*
- * The function is in two parts. The first part works out the total
- * number of blocks which we need. The second part does the actual
- * allocation asking for an extent at a time (if enough contiguous free
- * blocks are available, there will only be one request per bmap call)
- * and uses the state machine to initialise the blocks in order.
+ * This function is called after gfs2_iomap_get, which works out the
+ * total number of blocks which we need via gfs2_alloc_size.
+ *
+ * We then do the actual allocation asking for an extent at a time (if
+ * enough contiguous free blocks are available, there will only be one
+ * allocation request per call) and uses the state machine to initialise
+ * the blocks in order.
*
* Right now, this function will allocate at most one indirect block
* worth of data -- with a default block size of 4K, that's slightly
@@ -633,39 +639,26 @@ static int gfs2_iomap_alloc(struct inode *inode, struct iomap *iomap,
struct buffer_head *dibh = mp->mp_bh[0];
u64 bn;
unsigned n, i, blks, alloced = 0, iblks = 0, branch_start = 0;
- unsigned dblks = 0;
- unsigned ptrs_per_blk;
+ size_t dblks = iomap->length >> inode->i_blkbits;
const unsigned end_of_metadata = mp->mp_fheight - 1;
int ret;
enum alloc_state state;
__be64 *ptr;
__be64 zero_bn = 0;
- size_t maxlen = iomap->length >> inode->i_blkbits;
BUG_ON(mp->mp_aheight < 1);
BUG_ON(dibh == NULL);
+ BUG_ON(dblks < 1);
gfs2_trans_add_meta(ip->i_gl, dibh);
down_write(&ip->i_rw_mutex);
if (mp->mp_fheight == mp->mp_aheight) {
- struct buffer_head *bh;
- int eob;
-
- /* Bottom indirect block exists, find unalloced extent size */
- ptr = metapointer(end_of_metadata, mp);
- bh = mp->mp_bh[end_of_metadata];
- dblks = gfs2_extent_length(bh->b_data, bh->b_size, ptr,
- maxlen, &eob);
- BUG_ON(dblks < 1);
+ /* Bottom indirect block exists */
state = ALLOC_DATA;
} else {
/* Need to allocate indirect blocks */
- ptrs_per_blk = mp->mp_fheight > 1 ? sdp->sd_inptrs :
- sdp->sd_diptrs;
- dblks = min(maxlen, (size_t)(ptrs_per_blk -
- mp->mp_list[end_of_metadata]));
if (mp->mp_fheight == ip->i_height) {
/* Writing into existing tree, extend tree down */
iblks = mp->mp_fheight - mp->mp_aheight;
@@ -750,6 +743,7 @@ static int gfs2_iomap_alloc(struct inode *inode, struct iomap *iomap,
}
} while (iomap->addr == IOMAP_NULL_ADDR);
+ iomap->type = IOMAP_MAPPED;
iomap->length = (u64)dblks << inode->i_blkbits;
ip->i_height = mp->mp_fheight;
gfs2_add_inode_blocks(&ip->i_inode, alloced);
@@ -759,19 +753,64 @@ static int gfs2_iomap_alloc(struct inode *inode, struct iomap *iomap,
return ret;
}
-static void gfs2_stuffed_iomap(struct inode *inode, struct iomap *iomap)
+static void gfs2_stuffed_iomap(struct inode *inode, struct iomap *iomap,
+ u64 length)
{
struct gfs2_inode *ip = GFS2_I(inode);
iomap->addr = (ip->i_no_addr << inode->i_blkbits) +
sizeof(struct gfs2_dinode);
iomap->offset = 0;
- iomap->length = i_size_read(inode);
+ iomap->length = length;
iomap->type = IOMAP_INLINE;
}
#define IOMAP_F_GFS2_BOUNDARY IOMAP_F_PRIVATE
+/**
+ * gfs2_alloc_size - Compute the maximum allocation size
+ * @inode: The inode
+ * @mp: The metapath
+ * @size: Requested size in blocks
+ *
+ * Compute the maximum size of the next allocation at @mp.
+ *
+ * Returns: size in blocks
+ */
+static u64 gfs2_alloc_size(struct inode *inode, struct metapath *mp, u64 size)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ const __be64 *first, *ptr, *end;
+
+ /*
+ * For writes to stuffed files, this function is called twice via
+ * gfs2_iomap_get, before and after unstuffing. The size we return the
+ * first time needs to be large enough to get the reservation and
+ * allocation sizes right. The size we return the second time must
+ * be exact or else gfs2_iomap_alloc won't do the right thing.
+ */
+
+ if (gfs2_is_stuffed(ip) || mp->mp_fheight != mp->mp_aheight) {
+ unsigned maxsize = mp->mp_fheight > 1 ?
+ sdp->sd_inptrs : sdp->sd_diptrs;
+ maxsize -= mp->mp_list[mp->mp_fheight - 1];
+ if (size > maxsize)
+ size = maxsize;
+ return size;
+ }
+
+ first = metapointer(ip->i_height - 1, mp);
+ end = metaend(ip->i_height - 1, mp);
+ if (end - first > size)
+ end = first + size;
+ for (ptr = first; ptr < end; ptr++) {
+ if (*ptr)
+ break;
+ }
+ return ptr - first;
+}
+
/**
* gfs2_iomap_get - Map blocks from an inode to disk blocks
* @inode: The inode
@@ -805,10 +844,15 @@ static int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
if (flags & IOMAP_REPORT) {
if (pos >= i_size_read(inode))
return -ENOENT;
- gfs2_stuffed_iomap(inode, iomap);
+ gfs2_stuffed_iomap(inode, iomap,
+ i_size_read(inode));
+ return 0;
+ }
+ if (pos + length <= gfs2_max_stuffed_size(ip)) {
+ gfs2_stuffed_iomap(inode, iomap,
+ gfs2_max_stuffed_size(ip));
return 0;
}
- BUG_ON(!(flags & IOMAP_WRITE));
}
lblock = pos >> inode->i_blkbits;
iomap->offset = lblock << inode->i_blkbits;
@@ -868,10 +912,173 @@ static int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
ret = gfs2_hole_size(inode, lblock, len, mp, iomap);
else
iomap->length = size - pos;
+ } else if (flags & IOMAP_WRITE) {
+ u64 size;
+ size = gfs2_alloc_size(inode, mp, len) << inode->i_blkbits;
+ if (size < iomap->length)
+ iomap->length = size;
+ } else {
+ if (height == ip->i_height)
+ ret = gfs2_hole_size(inode, lblock, len, mp, iomap);
}
goto out;
}
+static int gfs2_write_lock(struct inode *inode)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ int error;
+
+ gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
+ error = gfs2_glock_nq(&ip->i_gh);
+ if (error)
+ goto out_uninit;
+ if (&ip->i_inode == sdp->sd_rindex) {
+ struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
+
+ error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE,
+ GL_NOCACHE, &m_ip->i_gh);
+ if (error)
+ goto out_unlock;
+ }
+ return 0;
+
+out_unlock:
+ gfs2_glock_dq(&ip->i_gh);
+out_uninit:
+ gfs2_holder_uninit(&ip->i_gh);
+ return error;
+}
+
+static void gfs2_write_unlock(struct inode *inode)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+
+ if (&ip->i_inode == sdp->sd_rindex) {
+ struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
+
+ gfs2_glock_dq_uninit(&m_ip->i_gh);
+ }
+ gfs2_glock_dq_uninit(&ip->i_gh);
+}
+
+static void gfs2_iomap_journaled_page_done(struct inode *inode, loff_t pos,
+ unsigned copied, struct page *page,
+ struct iomap *iomap)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+
+ gfs2_page_add_databufs(ip, page, offset_in_page(pos), copied);
+}
+
+static int gfs2_iomap_begin_write(struct inode *inode, loff_t pos, loff_t length,
+ unsigned flags, struct iomap *iomap)
+{
+ struct metapath mp = { .mp_aheight = 1, };
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
+ bool unstuff, alloc_required;
+ struct buffer_head *dibh = NULL;
+ int ret;
+
+ ret = gfs2_write_lock(inode);
+ if (ret)
+ return ret;
+
+ unstuff = gfs2_is_stuffed(ip) &&
+ pos + length > gfs2_max_stuffed_size(ip);
+
+ ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
+ if (ret)
+ goto out_release;
+
+ dibh = mp.mp_bh[0];
+ if (dibh) {
+ get_bh(dibh);
+ } else {
+ ret = gfs2_meta_inode_buffer(ip, &dibh);
+ if (ret)
+ goto out_release;
+ }
+ iomap->private = dibh;
+
+ if (iomap->type == IOMAP_INLINE)
+ iomap->inline_data = dibh->b_data + sizeof(struct gfs2_dinode);
+
+ alloc_required = unstuff || iomap->type == IOMAP_HOLE;
+
+ if (alloc_required || gfs2_is_jdata(ip))
+ gfs2_write_calc_reserv(ip, iomap->length, &data_blocks, &ind_blocks);
+
+ if (alloc_required) {
+ struct gfs2_alloc_parms ap = { .target = data_blocks + ind_blocks };
+ ret = gfs2_quota_lock_check(ip, &ap);
+ if (ret)
+ goto out_release;
+
+ ret = gfs2_inplace_reserve(ip, &ap);
+ if (ret)
+ goto out_qunlock;
+ }
+
+ rblocks = RES_DINODE + ind_blocks;
+ if (gfs2_is_jdata(ip))
+ rblocks += data_blocks;
+ if (ind_blocks || data_blocks)
+ rblocks += RES_STATFS + RES_QUOTA;
+ if (inode == sdp->sd_rindex)
+ rblocks += 2 * RES_STATFS;
+ if (alloc_required)
+ rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
+
+ ret = gfs2_trans_begin(sdp, rblocks, iomap->length >> inode->i_blkbits);
+ if (ret)
+ goto out_trans_fail;
+
+ if (unstuff) {
+ ret = gfs2_unstuff_dinode(ip, NULL);
+ if (ret)
+ goto out_trans_end;
+ release_metapath(&mp);
+ ret = gfs2_iomap_get(inode, iomap->offset, iomap->length,
+ flags, iomap, &mp);
+ if (ret)
+ goto out_trans_end;
+ }
+
+ if (iomap->type == IOMAP_HOLE) {
+ ret = gfs2_iomap_alloc(inode, iomap, flags, &mp);
+ if (ret) {
+ gfs2_trans_end(sdp);
+ gfs2_inplace_release(ip);
+ punch_hole(ip, iomap->offset, iomap->length);
+ goto out_qunlock;
+ }
+ }
+ release_metapath(&mp);
+ if (gfs2_is_jdata(ip))
+ iomap->page_done = gfs2_iomap_journaled_page_done;
+ return 0;
+
+out_trans_end:
+ gfs2_trans_end(sdp);
+out_trans_fail:
+ if (alloc_required)
+ gfs2_inplace_release(ip);
+out_qunlock:
+ if (alloc_required)
+ gfs2_quota_unlock(ip);
+out_release:
+ release_metapath(&mp);
+ if (dibh)
+ brelse(dibh);
+ gfs2_write_unlock(inode);
+ return ret;
+}
+
static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
unsigned flags, struct iomap *iomap)
{
@@ -881,10 +1088,7 @@ static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
trace_gfs2_iomap_start(ip, pos, length, flags);
if (flags & IOMAP_WRITE) {
- ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
- if (!ret && iomap->type == IOMAP_HOLE)
- ret = gfs2_iomap_alloc(inode, iomap, flags, &mp);
- release_metapath(&mp);
+ ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap);
} else {
ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
release_metapath(&mp);
@@ -893,8 +1097,61 @@ static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
return ret;
}
+static int gfs2_iomap_end(struct inode *inode, loff_t pos, loff_t length,
+ ssize_t written, unsigned flags, struct iomap *iomap)
+{
+ struct gfs2_inode *ip = GFS2_I(inode);
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ struct gfs2_trans *tr = current->journal_info;
+ struct buffer_head *dibh;
+
+ if (!(flags & IOMAP_WRITE))
+ return 0;
+
+ dibh = iomap->private;
+ if (iomap->type == IOMAP_INLINE) {
+ gfs2_trans_add_meta(ip->i_gl, dibh);
+ goto out;
+ }
+
+ gfs2_ordered_add_inode(ip);
+
+ if (tr->tr_num_buf_new)
+ __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
+ else {
+ gfs2_trans_add_meta(ip->i_gl, dibh);
+ }
+
+out:
+ brelse(dibh);
+ if (inode == sdp->sd_rindex) {
+ adjust_fs_space(inode);
+ sdp->sd_rindex_uptodate = 0;
+ }
+
+ gfs2_trans_end(sdp);
+ gfs2_inplace_release(ip);
+
+ if (length != written && (iomap->flags & IOMAP_F_NEW)) {
+ /* Deallocate blocks that were just allocated. */
+ loff_t blockmask = i_blocksize(inode) - 1;
+ loff_t end = (pos + length) & ~blockmask;
+ pos = (pos + written + blockmask) & ~blockmask;
+ if (pos < end) {
+ truncate_pagecache_range(inode, pos, end - 1);
+ punch_hole(ip, pos, end - pos);
+ }
+ }
+
+ if (ip->i_qadata && ip->i_qadata->qa_qd_num)
+ gfs2_quota_unlock(ip);
+ gfs2_write_unlock(inode);
+ return 0;
+}
+
const struct iomap_ops gfs2_iomap_ops = {
.iomap_begin = gfs2_iomap_begin,
+ .iomap_end = gfs2_iomap_end,
};
/**
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 7137db7b0119..16dd395479a5 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -26,10 +26,12 @@
#include <linux/dlm.h>
#include <linux/dlm_plock.h>
#include <linux/delay.h>
+#include <linux/backing-dev.h>
#include "gfs2.h"
#include "incore.h"
#include "bmap.h"
+#include "aops.h"
#include "dir.h"
#include "glock.h"
#include "glops.h"
@@ -691,9 +693,7 @@ static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
/**
* gfs2_file_write_iter - Perform a write to a file
* @iocb: The io context
- * @iov: The data to write
- * @nr_segs: Number of @iov segments
- * @pos: The file position
+ * @from: The data to write
*
* We have to do a lock/unlock here to refresh the inode size for
* O_APPEND writes, otherwise we can land up writing at the wrong
@@ -705,8 +705,9 @@ static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
- struct gfs2_inode *ip = GFS2_I(file_inode(file));
- int ret;
+ struct inode *inode = file_inode(file);
+ struct gfs2_inode *ip = GFS2_I(inode);
+ ssize_t ret;
ret = gfs2_rsqa_alloc(ip);
if (ret)
@@ -723,7 +724,38 @@ static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
gfs2_glock_dq_uninit(&gh);
}
- return generic_file_write_iter(iocb, from);
+ if (iocb->ki_flags & IOCB_DIRECT)
+ return generic_file_write_iter(iocb, from);
+
+ inode_lock(inode);
+ ret = generic_write_checks(iocb, from);
+ if (ret <= 0)
+ goto out;
+
+ /* We can write back this queue in page reclaim */
+ current->backing_dev_info = inode_to_bdi(inode);
+
+ ret = file_remove_privs(file);
+ if (ret)
+ goto out2;
+
+ ret = file_update_time(file);
+ if (ret)
+ goto out2;
+
+ ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
+
+out2:
+ current->backing_dev_info = NULL;
+out:
+ inode_unlock(inode);
+ if (likely(ret > 0)) {
+ iocb->ki_pos += ret;
+
+ /* Handle various SYNC-type writes */
+ ret = generic_write_sync(iocb, ret);
+ }
+ return ret;
}
static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
@@ -754,7 +786,7 @@ static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
if (error)
goto out;
offset = iomap.offset + iomap.length;
- if (iomap.type != IOMAP_HOLE)
+ if (!(iomap.flags & IOMAP_F_NEW))
continue;
error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits,
iomap.length >> inode->i_blkbits,
--
2.17.1
^ permalink raw reply related [flat|nested] 22+ messages in thread
* [PATCH v9 3/5] gfs2: gfs2_extent_length cleanup
2018-06-15 12:19 ` [Cluster-devel] " Andreas Gruenbacher
@ 2018-06-15 12:19 ` Andreas Gruenbacher
-1 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-15 12:19 UTC (permalink / raw)
To: cluster-devel, Christoph Hellwig; +Cc: linux-fsdevel, Andreas Gruenbacher
Now that gfs2_extent_length is no longer used for determining the size
of a hole and always with an upper size limit, the function can be
simplified.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/gfs2/bmap.c | 24 ++++++++----------------
1 file changed, 8 insertions(+), 16 deletions(-)
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 704a9150dcbc..b70ef98a9637 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -406,22 +406,17 @@ static void release_metapath(struct metapath *mp)
/**
* gfs2_extent_length - Returns length of an extent of blocks
- * @start: Start of the buffer
- * @len: Length of the buffer in bytes
- * @ptr: Current position in the buffer
- * @limit: Max extent length to return (0 = unlimited)
+ * @bh: The metadata block
+ * @ptr: Current position in @bh
+ * @limit: Max extent length to return
* @eob: Set to 1 if we hit "end of block"
*
- * If the first block is zero (unallocated) it will return the number of
- * unallocated blocks in the extent, otherwise it will return the number
- * of contiguous blocks in the extent.
- *
* Returns: The length of the extent (minimum of one block)
*/
-static inline unsigned int gfs2_extent_length(void *start, unsigned int len, __be64 *ptr, size_t limit, int *eob)
+static inline unsigned int gfs2_extent_length(struct buffer_head *bh, __be64 *ptr, size_t limit, int *eob)
{
- const __be64 *end = (start + len);
+ const __be64 *end = (__be64 *)(bh->b_data + bh->b_size);
const __be64 *first = ptr;
u64 d = be64_to_cpu(*ptr);
@@ -430,14 +425,11 @@ static inline unsigned int gfs2_extent_length(void *start, unsigned int len, __b
ptr++;
if (ptr >= end)
break;
- if (limit && --limit == 0)
- break;
- if (d)
- d++;
+ d++;
} while(be64_to_cpu(*ptr) == d);
if (ptr >= end)
*eob = 1;
- return (ptr - first);
+ return ptr - first;
}
typedef const __be64 *(*gfs2_metadata_walker)(
@@ -884,7 +876,7 @@ static int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
goto do_alloc;
bh = mp->mp_bh[ip->i_height - 1];
- len = gfs2_extent_length(bh->b_data, bh->b_size, ptr, len, &eob);
+ len = gfs2_extent_length(bh, ptr, len, &eob);
iomap->addr = be64_to_cpu(*ptr) << inode->i_blkbits;
iomap->length = len << inode->i_blkbits;
--
2.17.1
^ permalink raw reply related [flat|nested] 22+ messages in thread
* [Cluster-devel] [PATCH v9 3/5] gfs2: gfs2_extent_length cleanup
@ 2018-06-15 12:19 ` Andreas Gruenbacher
0 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-15 12:19 UTC (permalink / raw)
To: cluster-devel.redhat.com
Now that gfs2_extent_length is no longer used for determining the size
of a hole and always with an upper size limit, the function can be
simplified.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/gfs2/bmap.c | 24 ++++++++----------------
1 file changed, 8 insertions(+), 16 deletions(-)
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 704a9150dcbc..b70ef98a9637 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -406,22 +406,17 @@ static void release_metapath(struct metapath *mp)
/**
* gfs2_extent_length - Returns length of an extent of blocks
- * @start: Start of the buffer
- * @len: Length of the buffer in bytes
- * @ptr: Current position in the buffer
- * @limit: Max extent length to return (0 = unlimited)
+ * @bh: The metadata block
+ * @ptr: Current position in @bh
+ * @limit: Max extent length to return
* @eob: Set to 1 if we hit "end of block"
*
- * If the first block is zero (unallocated) it will return the number of
- * unallocated blocks in the extent, otherwise it will return the number
- * of contiguous blocks in the extent.
- *
* Returns: The length of the extent (minimum of one block)
*/
-static inline unsigned int gfs2_extent_length(void *start, unsigned int len, __be64 *ptr, size_t limit, int *eob)
+static inline unsigned int gfs2_extent_length(struct buffer_head *bh, __be64 *ptr, size_t limit, int *eob)
{
- const __be64 *end = (start + len);
+ const __be64 *end = (__be64 *)(bh->b_data + bh->b_size);
const __be64 *first = ptr;
u64 d = be64_to_cpu(*ptr);
@@ -430,14 +425,11 @@ static inline unsigned int gfs2_extent_length(void *start, unsigned int len, __b
ptr++;
if (ptr >= end)
break;
- if (limit && --limit == 0)
- break;
- if (d)
- d++;
+ d++;
} while(be64_to_cpu(*ptr) == d);
if (ptr >= end)
*eob = 1;
- return (ptr - first);
+ return ptr - first;
}
typedef const __be64 *(*gfs2_metadata_walker)(
@@ -884,7 +876,7 @@ static int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
goto do_alloc;
bh = mp->mp_bh[ip->i_height - 1];
- len = gfs2_extent_length(bh->b_data, bh->b_size, ptr, len, &eob);
+ len = gfs2_extent_length(bh, ptr, len, &eob);
iomap->addr = be64_to_cpu(*ptr) << inode->i_blkbits;
iomap->length = len << inode->i_blkbits;
--
2.17.1
^ permalink raw reply related [flat|nested] 22+ messages in thread
* [PATCH v9 4/5] gfs2: iomap direct I/O support
2018-06-15 12:19 ` [Cluster-devel] " Andreas Gruenbacher
@ 2018-06-15 12:19 ` Andreas Gruenbacher
-1 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-15 12:19 UTC (permalink / raw)
To: cluster-devel, Christoph Hellwig; +Cc: linux-fsdevel, Andreas Gruenbacher
The page unmapping previously done in gfs2_direct_IO is now done
generically in iomap_dio_rw.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/gfs2/aops.c | 100 +----------------------------------
fs/gfs2/bmap.c | 15 +++++-
fs/gfs2/file.c | 138 +++++++++++++++++++++++++++++++++++++++++++++----
3 files changed, 143 insertions(+), 110 deletions(-)
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index ecfbca9c88ff..1054cc4a96db 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -84,12 +84,6 @@ static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
return 0;
}
-static int gfs2_get_block_direct(struct inode *inode, sector_t lblock,
- struct buffer_head *bh_result, int create)
-{
- return gfs2_block_map(inode, lblock, bh_result, 0);
-}
-
/**
* gfs2_writepage_common - Common bits of writepage
* @page: The page to be written
@@ -1024,96 +1018,6 @@ static void gfs2_invalidatepage(struct page *page, unsigned int offset,
try_to_release_page(page, 0);
}
-/**
- * gfs2_ok_for_dio - check that dio is valid on this file
- * @ip: The inode
- * @offset: The offset at which we are reading or writing
- *
- * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o)
- * 1 (to accept the i/o request)
- */
-static int gfs2_ok_for_dio(struct gfs2_inode *ip, loff_t offset)
-{
- /*
- * Should we return an error here? I can't see that O_DIRECT for
- * a stuffed file makes any sense. For now we'll silently fall
- * back to buffered I/O
- */
- if (gfs2_is_stuffed(ip))
- return 0;
-
- if (offset >= i_size_read(&ip->i_inode))
- return 0;
- return 1;
-}
-
-
-
-static ssize_t gfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
-{
- struct file *file = iocb->ki_filp;
- struct inode *inode = file->f_mapping->host;
- struct address_space *mapping = inode->i_mapping;
- struct gfs2_inode *ip = GFS2_I(inode);
- loff_t offset = iocb->ki_pos;
- struct gfs2_holder gh;
- int rv;
-
- /*
- * Deferred lock, even if its a write, since we do no allocation
- * on this path. All we need change is atime, and this lock mode
- * ensures that other nodes have flushed their buffered read caches
- * (i.e. their page cache entries for this inode). We do not,
- * unfortunately have the option of only flushing a range like
- * the VFS does.
- */
- gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
- rv = gfs2_glock_nq(&gh);
- if (rv)
- goto out_uninit;
- rv = gfs2_ok_for_dio(ip, offset);
- if (rv != 1)
- goto out; /* dio not valid, fall back to buffered i/o */
-
- /*
- * Now since we are holding a deferred (CW) lock at this point, you
- * might be wondering why this is ever needed. There is a case however
- * where we've granted a deferred local lock against a cached exclusive
- * glock. That is ok provided all granted local locks are deferred, but
- * it also means that it is possible to encounter pages which are
- * cached and possibly also mapped. So here we check for that and sort
- * them out ahead of the dio. The glock state machine will take care of
- * everything else.
- *
- * If in fact the cached glock state (gl->gl_state) is deferred (CW) in
- * the first place, mapping->nr_pages will always be zero.
- */
- if (mapping->nrpages) {
- loff_t lstart = offset & ~(PAGE_SIZE - 1);
- loff_t len = iov_iter_count(iter);
- loff_t end = PAGE_ALIGN(offset + len) - 1;
-
- rv = 0;
- if (len == 0)
- goto out;
- if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
- unmap_shared_mapping_range(ip->i_inode.i_mapping, offset, len);
- rv = filemap_write_and_wait_range(mapping, lstart, end);
- if (rv)
- goto out;
- if (iov_iter_rw(iter) == WRITE)
- truncate_inode_pages_range(mapping, lstart, end);
- }
-
- rv = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter,
- gfs2_get_block_direct, NULL, NULL, 0);
-out:
- gfs2_glock_dq(&gh);
-out_uninit:
- gfs2_holder_uninit(&gh);
- return rv;
-}
-
/**
* gfs2_releasepage - free the metadata associated with a page
* @page: the page that's being released
@@ -1194,7 +1098,7 @@ static const struct address_space_operations gfs2_writeback_aops = {
.bmap = gfs2_bmap,
.invalidatepage = gfs2_invalidatepage,
.releasepage = gfs2_releasepage,
- .direct_IO = gfs2_direct_IO,
+ .direct_IO = noop_direct_IO,
.migratepage = buffer_migrate_page,
.is_partially_uptodate = block_is_partially_uptodate,
.error_remove_page = generic_error_remove_page,
@@ -1211,7 +1115,7 @@ static const struct address_space_operations gfs2_ordered_aops = {
.bmap = gfs2_bmap,
.invalidatepage = gfs2_invalidatepage,
.releasepage = gfs2_releasepage,
- .direct_IO = gfs2_direct_IO,
+ .direct_IO = noop_direct_IO,
.migratepage = buffer_migrate_page,
.is_partially_uptodate = block_is_partially_uptodate,
.error_remove_page = generic_error_remove_page,
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index b70ef98a9637..3978b8cb3178 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -906,6 +906,10 @@ static int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
iomap->length = size - pos;
} else if (flags & IOMAP_WRITE) {
u64 size;
+
+ if (flags & IOMAP_DIRECT)
+ goto out;
+
size = gfs2_alloc_size(inode, mp, len) << inode->i_blkbits;
if (size < iomap->length)
iomap->length = size;
@@ -1080,7 +1084,14 @@ static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
trace_gfs2_iomap_start(ip, pos, length, flags);
if (flags & IOMAP_WRITE) {
- ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap);
+ if (flags & IOMAP_DIRECT) {
+ ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
+ release_metapath(&mp);
+ if (iomap->type != IOMAP_MAPPED)
+ ret = -ENOTBLK;
+ } else {
+ ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap);
+ }
} else {
ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
release_metapath(&mp);
@@ -1097,7 +1108,7 @@ static int gfs2_iomap_end(struct inode *inode, loff_t pos, loff_t length,
struct gfs2_trans *tr = current->journal_info;
struct buffer_head *dibh;
- if (!(flags & IOMAP_WRITE))
+ if ((flags & (IOMAP_WRITE | IOMAP_DIRECT)) != IOMAP_WRITE)
return 0;
dibh = iomap->private;
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 16dd395479a5..8de92708f18b 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -690,6 +690,91 @@ static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
return ret ? ret : ret1;
}
+static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to)
+{
+ struct file *file = iocb->ki_filp;
+ struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
+ size_t count = iov_iter_count(to);
+ struct gfs2_holder gh;
+ ssize_t ret;
+
+ if (!count)
+ return 0; /* skip atime */
+
+ gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
+ ret = gfs2_glock_nq(&gh);
+ if (ret)
+ goto out_uninit;
+
+ /* fall back to buffered I/O for stuffed files */
+ ret = -ENOTBLK;
+ if (gfs2_is_stuffed(ip))
+ goto out;
+
+ ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL);
+
+out:
+ gfs2_glock_dq(&gh);
+out_uninit:
+ gfs2_holder_uninit(&gh);
+ return ret;
+}
+
+static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
+{
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file->f_mapping->host;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ size_t len = iov_iter_count(from);
+ loff_t offset = iocb->ki_pos;
+ struct gfs2_holder gh;
+ ssize_t ret;
+
+ /*
+ * Deferred lock, even if its a write, since we do no allocation on
+ * this path. All we need to change is the atime, and this lock mode
+ * ensures that other nodes have flushed their buffered read caches
+ * (i.e. their page cache entries for this inode). We do not,
+ * unfortunately, have the option of only flushing a range like the
+ * VFS does.
+ */
+ gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
+ ret = gfs2_glock_nq(&gh);
+ if (ret)
+ goto out_uninit;
+
+ /* Silently fall back to buffered I/O for stuffed files */
+ if (gfs2_is_stuffed(ip))
+ goto out;
+
+ /* Silently fall back to buffered I/O when writing beyond EOF */
+ if (offset + len > i_size_read(&ip->i_inode))
+ goto out;
+
+ ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL);
+
+out:
+ gfs2_glock_dq(&gh);
+out_uninit:
+ gfs2_holder_uninit(&gh);
+ return ret;
+}
+
+static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
+{
+ ssize_t ret;
+
+ if (iocb->ki_flags & IOCB_DIRECT) {
+ ret = gfs2_file_direct_read(iocb, to);
+ if (likely(ret != -ENOTBLK))
+ goto out;
+ iocb->ki_flags &= ~IOCB_DIRECT;
+ }
+ ret = generic_file_read_iter(iocb, to);
+out:
+ return ret;
+}
+
/**
* gfs2_file_write_iter - Perform a write to a file
* @iocb: The io context
@@ -707,7 +792,7 @@ static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
struct gfs2_inode *ip = GFS2_I(inode);
- ssize_t ret;
+ ssize_t written = 0, ret;
ret = gfs2_rsqa_alloc(ip);
if (ret)
@@ -724,9 +809,6 @@ static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
gfs2_glock_dq_uninit(&gh);
}
- if (iocb->ki_flags & IOCB_DIRECT)
- return generic_file_write_iter(iocb, from);
-
inode_lock(inode);
ret = generic_write_checks(iocb, from);
if (ret <= 0)
@@ -743,19 +825,55 @@ static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (ret)
goto out2;
- ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
+ if (iocb->ki_flags & IOCB_DIRECT) {
+ struct address_space *mapping = file->f_mapping;
+ loff_t pos, endbyte;
+ ssize_t buffered;
+
+ written = gfs2_file_direct_write(iocb, from);
+ if (written < 0 || !iov_iter_count(from))
+ goto out2;
+
+ ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
+ if (unlikely(ret < 0))
+ goto out2;
+ buffered = ret;
+
+ /*
+ * We need to ensure that the page cache pages are written to
+ * disk and invalidated to preserve the expected O_DIRECT
+ * semantics.
+ */
+ pos = iocb->ki_pos;
+ endbyte = pos + buffered - 1;
+ ret = filemap_write_and_wait_range(mapping, pos, endbyte);
+ if (!ret) {
+ iocb->ki_pos += buffered;
+ written += buffered;
+ invalidate_mapping_pages(mapping,
+ pos >> PAGE_SHIFT,
+ endbyte >> PAGE_SHIFT);
+ } else {
+ /*
+ * We don't know how much we wrote, so just return
+ * the number of bytes which were direct-written
+ */
+ }
+ } else {
+ ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
+ if (likely(ret > 0))
+ iocb->ki_pos += ret;
+ }
out2:
current->backing_dev_info = NULL;
out:
inode_unlock(inode);
if (likely(ret > 0)) {
- iocb->ki_pos += ret;
-
/* Handle various SYNC-type writes */
ret = generic_write_sync(iocb, ret);
}
- return ret;
+ return written ? written : ret;
}
static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
@@ -1157,7 +1275,7 @@ static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
const struct file_operations gfs2_file_fops = {
.llseek = gfs2_llseek,
- .read_iter = generic_file_read_iter,
+ .read_iter = gfs2_file_read_iter,
.write_iter = gfs2_file_write_iter,
.unlocked_ioctl = gfs2_ioctl,
.mmap = gfs2_mmap,
@@ -1187,7 +1305,7 @@ const struct file_operations gfs2_dir_fops = {
const struct file_operations gfs2_file_fops_nolock = {
.llseek = gfs2_llseek,
- .read_iter = generic_file_read_iter,
+ .read_iter = gfs2_file_read_iter,
.write_iter = gfs2_file_write_iter,
.unlocked_ioctl = gfs2_ioctl,
.mmap = gfs2_mmap,
--
2.17.1
^ permalink raw reply related [flat|nested] 22+ messages in thread
* [Cluster-devel] [PATCH v9 4/5] gfs2: iomap direct I/O support
@ 2018-06-15 12:19 ` Andreas Gruenbacher
0 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-15 12:19 UTC (permalink / raw)
To: cluster-devel.redhat.com
The page unmapping previously done in gfs2_direct_IO is now done
generically in iomap_dio_rw.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/gfs2/aops.c | 100 +----------------------------------
fs/gfs2/bmap.c | 15 +++++-
fs/gfs2/file.c | 138 +++++++++++++++++++++++++++++++++++++++++++++----
3 files changed, 143 insertions(+), 110 deletions(-)
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index ecfbca9c88ff..1054cc4a96db 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -84,12 +84,6 @@ static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
return 0;
}
-static int gfs2_get_block_direct(struct inode *inode, sector_t lblock,
- struct buffer_head *bh_result, int create)
-{
- return gfs2_block_map(inode, lblock, bh_result, 0);
-}
-
/**
* gfs2_writepage_common - Common bits of writepage
* @page: The page to be written
@@ -1024,96 +1018,6 @@ static void gfs2_invalidatepage(struct page *page, unsigned int offset,
try_to_release_page(page, 0);
}
-/**
- * gfs2_ok_for_dio - check that dio is valid on this file
- * @ip: The inode
- * @offset: The offset at which we are reading or writing
- *
- * Returns: 0 (to ignore the i/o request and thus fall back to buffered i/o)
- * 1 (to accept the i/o request)
- */
-static int gfs2_ok_for_dio(struct gfs2_inode *ip, loff_t offset)
-{
- /*
- * Should we return an error here? I can't see that O_DIRECT for
- * a stuffed file makes any sense. For now we'll silently fall
- * back to buffered I/O
- */
- if (gfs2_is_stuffed(ip))
- return 0;
-
- if (offset >= i_size_read(&ip->i_inode))
- return 0;
- return 1;
-}
-
-
-
-static ssize_t gfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
-{
- struct file *file = iocb->ki_filp;
- struct inode *inode = file->f_mapping->host;
- struct address_space *mapping = inode->i_mapping;
- struct gfs2_inode *ip = GFS2_I(inode);
- loff_t offset = iocb->ki_pos;
- struct gfs2_holder gh;
- int rv;
-
- /*
- * Deferred lock, even if its a write, since we do no allocation
- * on this path. All we need change is atime, and this lock mode
- * ensures that other nodes have flushed their buffered read caches
- * (i.e. their page cache entries for this inode). We do not,
- * unfortunately have the option of only flushing a range like
- * the VFS does.
- */
- gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
- rv = gfs2_glock_nq(&gh);
- if (rv)
- goto out_uninit;
- rv = gfs2_ok_for_dio(ip, offset);
- if (rv != 1)
- goto out; /* dio not valid, fall back to buffered i/o */
-
- /*
- * Now since we are holding a deferred (CW) lock at this point, you
- * might be wondering why this is ever needed. There is a case however
- * where we've granted a deferred local lock against a cached exclusive
- * glock. That is ok provided all granted local locks are deferred, but
- * it also means that it is possible to encounter pages which are
- * cached and possibly also mapped. So here we check for that and sort
- * them out ahead of the dio. The glock state machine will take care of
- * everything else.
- *
- * If in fact the cached glock state (gl->gl_state) is deferred (CW) in
- * the first place, mapping->nr_pages will always be zero.
- */
- if (mapping->nrpages) {
- loff_t lstart = offset & ~(PAGE_SIZE - 1);
- loff_t len = iov_iter_count(iter);
- loff_t end = PAGE_ALIGN(offset + len) - 1;
-
- rv = 0;
- if (len == 0)
- goto out;
- if (test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
- unmap_shared_mapping_range(ip->i_inode.i_mapping, offset, len);
- rv = filemap_write_and_wait_range(mapping, lstart, end);
- if (rv)
- goto out;
- if (iov_iter_rw(iter) == WRITE)
- truncate_inode_pages_range(mapping, lstart, end);
- }
-
- rv = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, iter,
- gfs2_get_block_direct, NULL, NULL, 0);
-out:
- gfs2_glock_dq(&gh);
-out_uninit:
- gfs2_holder_uninit(&gh);
- return rv;
-}
-
/**
* gfs2_releasepage - free the metadata associated with a page
* @page: the page that's being released
@@ -1194,7 +1098,7 @@ static const struct address_space_operations gfs2_writeback_aops = {
.bmap = gfs2_bmap,
.invalidatepage = gfs2_invalidatepage,
.releasepage = gfs2_releasepage,
- .direct_IO = gfs2_direct_IO,
+ .direct_IO = noop_direct_IO,
.migratepage = buffer_migrate_page,
.is_partially_uptodate = block_is_partially_uptodate,
.error_remove_page = generic_error_remove_page,
@@ -1211,7 +1115,7 @@ static const struct address_space_operations gfs2_ordered_aops = {
.bmap = gfs2_bmap,
.invalidatepage = gfs2_invalidatepage,
.releasepage = gfs2_releasepage,
- .direct_IO = gfs2_direct_IO,
+ .direct_IO = noop_direct_IO,
.migratepage = buffer_migrate_page,
.is_partially_uptodate = block_is_partially_uptodate,
.error_remove_page = generic_error_remove_page,
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index b70ef98a9637..3978b8cb3178 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -906,6 +906,10 @@ static int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
iomap->length = size - pos;
} else if (flags & IOMAP_WRITE) {
u64 size;
+
+ if (flags & IOMAP_DIRECT)
+ goto out;
+
size = gfs2_alloc_size(inode, mp, len) << inode->i_blkbits;
if (size < iomap->length)
iomap->length = size;
@@ -1080,7 +1084,14 @@ static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
trace_gfs2_iomap_start(ip, pos, length, flags);
if (flags & IOMAP_WRITE) {
- ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap);
+ if (flags & IOMAP_DIRECT) {
+ ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
+ release_metapath(&mp);
+ if (iomap->type != IOMAP_MAPPED)
+ ret = -ENOTBLK;
+ } else {
+ ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap);
+ }
} else {
ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
release_metapath(&mp);
@@ -1097,7 +1108,7 @@ static int gfs2_iomap_end(struct inode *inode, loff_t pos, loff_t length,
struct gfs2_trans *tr = current->journal_info;
struct buffer_head *dibh;
- if (!(flags & IOMAP_WRITE))
+ if ((flags & (IOMAP_WRITE | IOMAP_DIRECT)) != IOMAP_WRITE)
return 0;
dibh = iomap->private;
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 16dd395479a5..8de92708f18b 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -690,6 +690,91 @@ static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
return ret ? ret : ret1;
}
+static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to)
+{
+ struct file *file = iocb->ki_filp;
+ struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
+ size_t count = iov_iter_count(to);
+ struct gfs2_holder gh;
+ ssize_t ret;
+
+ if (!count)
+ return 0; /* skip atime */
+
+ gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
+ ret = gfs2_glock_nq(&gh);
+ if (ret)
+ goto out_uninit;
+
+ /* fall back to buffered I/O for stuffed files */
+ ret = -ENOTBLK;
+ if (gfs2_is_stuffed(ip))
+ goto out;
+
+ ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL);
+
+out:
+ gfs2_glock_dq(&gh);
+out_uninit:
+ gfs2_holder_uninit(&gh);
+ return ret;
+}
+
+static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
+{
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file->f_mapping->host;
+ struct gfs2_inode *ip = GFS2_I(inode);
+ size_t len = iov_iter_count(from);
+ loff_t offset = iocb->ki_pos;
+ struct gfs2_holder gh;
+ ssize_t ret;
+
+ /*
+ * Deferred lock, even if its a write, since we do no allocation on
+ * this path. All we need to change is the atime, and this lock mode
+ * ensures that other nodes have flushed their buffered read caches
+ * (i.e. their page cache entries for this inode). We do not,
+ * unfortunately, have the option of only flushing a range like the
+ * VFS does.
+ */
+ gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
+ ret = gfs2_glock_nq(&gh);
+ if (ret)
+ goto out_uninit;
+
+ /* Silently fall back to buffered I/O for stuffed files */
+ if (gfs2_is_stuffed(ip))
+ goto out;
+
+ /* Silently fall back to buffered I/O when writing beyond EOF */
+ if (offset + len > i_size_read(&ip->i_inode))
+ goto out;
+
+ ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL);
+
+out:
+ gfs2_glock_dq(&gh);
+out_uninit:
+ gfs2_holder_uninit(&gh);
+ return ret;
+}
+
+static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
+{
+ ssize_t ret;
+
+ if (iocb->ki_flags & IOCB_DIRECT) {
+ ret = gfs2_file_direct_read(iocb, to);
+ if (likely(ret != -ENOTBLK))
+ goto out;
+ iocb->ki_flags &= ~IOCB_DIRECT;
+ }
+ ret = generic_file_read_iter(iocb, to);
+out:
+ return ret;
+}
+
/**
* gfs2_file_write_iter - Perform a write to a file
* @iocb: The io context
@@ -707,7 +792,7 @@ static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
struct gfs2_inode *ip = GFS2_I(inode);
- ssize_t ret;
+ ssize_t written = 0, ret;
ret = gfs2_rsqa_alloc(ip);
if (ret)
@@ -724,9 +809,6 @@ static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
gfs2_glock_dq_uninit(&gh);
}
- if (iocb->ki_flags & IOCB_DIRECT)
- return generic_file_write_iter(iocb, from);
-
inode_lock(inode);
ret = generic_write_checks(iocb, from);
if (ret <= 0)
@@ -743,19 +825,55 @@ static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (ret)
goto out2;
- ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
+ if (iocb->ki_flags & IOCB_DIRECT) {
+ struct address_space *mapping = file->f_mapping;
+ loff_t pos, endbyte;
+ ssize_t buffered;
+
+ written = gfs2_file_direct_write(iocb, from);
+ if (written < 0 || !iov_iter_count(from))
+ goto out2;
+
+ ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
+ if (unlikely(ret < 0))
+ goto out2;
+ buffered = ret;
+
+ /*
+ * We need to ensure that the page cache pages are written to
+ * disk and invalidated to preserve the expected O_DIRECT
+ * semantics.
+ */
+ pos = iocb->ki_pos;
+ endbyte = pos + buffered - 1;
+ ret = filemap_write_and_wait_range(mapping, pos, endbyte);
+ if (!ret) {
+ iocb->ki_pos += buffered;
+ written += buffered;
+ invalidate_mapping_pages(mapping,
+ pos >> PAGE_SHIFT,
+ endbyte >> PAGE_SHIFT);
+ } else {
+ /*
+ * We don't know how much we wrote, so just return
+ * the number of bytes which were direct-written
+ */
+ }
+ } else {
+ ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
+ if (likely(ret > 0))
+ iocb->ki_pos += ret;
+ }
out2:
current->backing_dev_info = NULL;
out:
inode_unlock(inode);
if (likely(ret > 0)) {
- iocb->ki_pos += ret;
-
/* Handle various SYNC-type writes */
ret = generic_write_sync(iocb, ret);
}
- return ret;
+ return written ? written : ret;
}
static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
@@ -1157,7 +1275,7 @@ static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
const struct file_operations gfs2_file_fops = {
.llseek = gfs2_llseek,
- .read_iter = generic_file_read_iter,
+ .read_iter = gfs2_file_read_iter,
.write_iter = gfs2_file_write_iter,
.unlocked_ioctl = gfs2_ioctl,
.mmap = gfs2_mmap,
@@ -1187,7 +1305,7 @@ const struct file_operations gfs2_dir_fops = {
const struct file_operations gfs2_file_fops_nolock = {
.llseek = gfs2_llseek,
- .read_iter = generic_file_read_iter,
+ .read_iter = gfs2_file_read_iter,
.write_iter = gfs2_file_write_iter,
.unlocked_ioctl = gfs2_ioctl,
.mmap = gfs2_mmap,
--
2.17.1
^ permalink raw reply related [flat|nested] 22+ messages in thread
* [PATCH v9 5/5] gfs2: Remove gfs2_write_{begin,end}
2018-06-15 12:19 ` [Cluster-devel] " Andreas Gruenbacher
@ 2018-06-15 12:19 ` Andreas Gruenbacher
-1 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-15 12:19 UTC (permalink / raw)
To: cluster-devel, Christoph Hellwig; +Cc: linux-fsdevel, Andreas Gruenbacher
Now that generic_file_write_iter is no longer used, there are no
remaining users of these address space operations.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/gfs2/aops.c | 213 -------------------------------------------------
1 file changed, 213 deletions(-)
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 1054cc4a96db..cc80fd71f3dd 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -639,135 +639,6 @@ static int gfs2_readpages(struct file *file, struct address_space *mapping,
return ret;
}
-/**
- * gfs2_write_begin - Begin to write to a file
- * @file: The file to write to
- * @mapping: The mapping in which to write
- * @pos: The file offset at which to start writing
- * @len: Length of the write
- * @flags: Various flags
- * @pagep: Pointer to return the page
- * @fsdata: Pointer to return fs data (unused by GFS2)
- *
- * Returns: errno
- */
-
-static int gfs2_write_begin(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned flags,
- struct page **pagep, void **fsdata)
-{
- struct gfs2_inode *ip = GFS2_I(mapping->host);
- struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
- struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
- unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
- unsigned requested = 0;
- int alloc_required;
- int error = 0;
- pgoff_t index = pos >> PAGE_SHIFT;
- unsigned from = pos & (PAGE_SIZE - 1);
- struct page *page;
-
- gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
- error = gfs2_glock_nq(&ip->i_gh);
- if (unlikely(error))
- goto out_uninit;
- if (&ip->i_inode == sdp->sd_rindex) {
- error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE,
- GL_NOCACHE, &m_ip->i_gh);
- if (unlikely(error)) {
- gfs2_glock_dq(&ip->i_gh);
- goto out_uninit;
- }
- }
-
- alloc_required = gfs2_write_alloc_required(ip, pos, len);
-
- if (alloc_required || gfs2_is_jdata(ip))
- gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks);
-
- if (alloc_required) {
- struct gfs2_alloc_parms ap = { .aflags = 0, };
- requested = data_blocks + ind_blocks;
- ap.target = requested;
- error = gfs2_quota_lock_check(ip, &ap);
- if (error)
- goto out_unlock;
-
- error = gfs2_inplace_reserve(ip, &ap);
- if (error)
- goto out_qunlock;
- }
-
- rblocks = RES_DINODE + ind_blocks;
- if (gfs2_is_jdata(ip))
- rblocks += data_blocks ? data_blocks : 1;
- if (ind_blocks || data_blocks)
- rblocks += RES_STATFS + RES_QUOTA;
- if (&ip->i_inode == sdp->sd_rindex)
- rblocks += 2 * RES_STATFS;
- if (alloc_required)
- rblocks += gfs2_rg_blocks(ip, requested);
-
- error = gfs2_trans_begin(sdp, rblocks,
- PAGE_SIZE/sdp->sd_sb.sb_bsize);
- if (error)
- goto out_trans_fail;
-
- error = -ENOMEM;
- flags |= AOP_FLAG_NOFS;
- page = grab_cache_page_write_begin(mapping, index, flags);
- *pagep = page;
- if (unlikely(!page))
- goto out_endtrans;
-
- if (gfs2_is_stuffed(ip)) {
- error = 0;
- if (pos + len > gfs2_max_stuffed_size(ip)) {
- error = gfs2_unstuff_dinode(ip, page);
- if (error == 0)
- goto prepare_write;
- } else if (!PageUptodate(page)) {
- error = stuffed_readpage(ip, page);
- }
- goto out;
- }
-
-prepare_write:
- error = __block_write_begin(page, from, len, gfs2_block_map);
-out:
- if (error == 0)
- return 0;
-
- unlock_page(page);
- put_page(page);
-
- gfs2_trans_end(sdp);
- if (alloc_required) {
- gfs2_inplace_release(ip);
- if (pos + len > ip->i_inode.i_size)
- gfs2_trim_blocks(&ip->i_inode);
- }
- goto out_qunlock;
-
-out_endtrans:
- gfs2_trans_end(sdp);
-out_trans_fail:
- if (alloc_required)
- gfs2_inplace_release(ip);
-out_qunlock:
- if (alloc_required)
- gfs2_quota_unlock(ip);
-out_unlock:
- if (&ip->i_inode == sdp->sd_rindex) {
- gfs2_glock_dq(&m_ip->i_gh);
- gfs2_holder_uninit(&m_ip->i_gh);
- }
- gfs2_glock_dq(&ip->i_gh);
-out_uninit:
- gfs2_holder_uninit(&ip->i_gh);
- return error;
-}
-
/**
* adjust_fs_space - Adjusts the free space available due to gfs2_grow
* @inode: the rindex inode
@@ -848,84 +719,6 @@ int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
return copied;
}
-/**
- * gfs2_write_end
- * @file: The file to write to
- * @mapping: The address space to write to
- * @pos: The file position
- * @len: The length of the data
- * @copied: How much was actually copied by the VFS
- * @page: The page that has been written
- * @fsdata: The fsdata (unused in GFS2)
- *
- * The main write_end function for GFS2. We just put our locking around the VFS
- * provided functions.
- *
- * Returns: copied bytes or errno
- */
-
-static int gfs2_write_end(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned copied,
- struct page *page, void *fsdata)
-{
- struct inode *inode = page->mapping->host;
- struct gfs2_inode *ip = GFS2_I(inode);
- struct gfs2_sbd *sdp = GFS2_SB(inode);
- struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
- struct buffer_head *dibh;
- int ret;
- struct gfs2_trans *tr = current->journal_info;
- BUG_ON(!tr);
-
- BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL);
-
- ret = gfs2_meta_inode_buffer(ip, &dibh);
- if (unlikely(ret))
- goto out;
-
- if (gfs2_is_stuffed(ip)) {
- ret = gfs2_stuffed_write_end(inode, dibh, pos, copied, page);
- page = NULL;
- goto out2;
- }
-
- if (gfs2_is_jdata(ip))
- gfs2_page_add_databufs(ip, page, pos & ~PAGE_MASK, len);
- else
- gfs2_ordered_add_inode(ip);
-
- ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
- page = NULL;
- if (tr->tr_num_buf_new)
- __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
- else
- gfs2_trans_add_meta(ip->i_gl, dibh);
-
-out2:
- if (inode == sdp->sd_rindex) {
- adjust_fs_space(inode);
- sdp->sd_rindex_uptodate = 0;
- }
-
- brelse(dibh);
-out:
- if (page) {
- unlock_page(page);
- put_page(page);
- }
- gfs2_trans_end(sdp);
- gfs2_inplace_release(ip);
- if (ip->i_qadata && ip->i_qadata->qa_qd_num)
- gfs2_quota_unlock(ip);
- if (inode == sdp->sd_rindex) {
- gfs2_glock_dq(&m_ip->i_gh);
- gfs2_holder_uninit(&m_ip->i_gh);
- }
- gfs2_glock_dq(&ip->i_gh);
- gfs2_holder_uninit(&ip->i_gh);
- return ret;
-}
-
/**
* jdata_set_page_dirty - Page dirtying function
* @page: The page to dirty
@@ -1093,8 +886,6 @@ static const struct address_space_operations gfs2_writeback_aops = {
.writepages = gfs2_writepages,
.readpage = gfs2_readpage,
.readpages = gfs2_readpages,
- .write_begin = gfs2_write_begin,
- .write_end = gfs2_write_end,
.bmap = gfs2_bmap,
.invalidatepage = gfs2_invalidatepage,
.releasepage = gfs2_releasepage,
@@ -1109,8 +900,6 @@ static const struct address_space_operations gfs2_ordered_aops = {
.writepages = gfs2_writepages,
.readpage = gfs2_readpage,
.readpages = gfs2_readpages,
- .write_begin = gfs2_write_begin,
- .write_end = gfs2_write_end,
.set_page_dirty = __set_page_dirty_buffers,
.bmap = gfs2_bmap,
.invalidatepage = gfs2_invalidatepage,
@@ -1126,8 +915,6 @@ static const struct address_space_operations gfs2_jdata_aops = {
.writepages = gfs2_jdata_writepages,
.readpage = gfs2_readpage,
.readpages = gfs2_readpages,
- .write_begin = gfs2_write_begin,
- .write_end = gfs2_write_end,
.set_page_dirty = jdata_set_page_dirty,
.bmap = gfs2_bmap,
.invalidatepage = gfs2_invalidatepage,
--
2.17.1
^ permalink raw reply related [flat|nested] 22+ messages in thread
* [Cluster-devel] [PATCH v9 5/5] gfs2: Remove gfs2_write_{begin, end}
@ 2018-06-15 12:19 ` Andreas Gruenbacher
0 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-15 12:19 UTC (permalink / raw)
To: cluster-devel.redhat.com
Now that generic_file_write_iter is no longer used, there are no
remaining users of these address space operations.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/gfs2/aops.c | 213 -------------------------------------------------
1 file changed, 213 deletions(-)
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 1054cc4a96db..cc80fd71f3dd 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -639,135 +639,6 @@ static int gfs2_readpages(struct file *file, struct address_space *mapping,
return ret;
}
-/**
- * gfs2_write_begin - Begin to write to a file
- * @file: The file to write to
- * @mapping: The mapping in which to write
- * @pos: The file offset at which to start writing
- * @len: Length of the write
- * @flags: Various flags
- * @pagep: Pointer to return the page
- * @fsdata: Pointer to return fs data (unused by GFS2)
- *
- * Returns: errno
- */
-
-static int gfs2_write_begin(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned flags,
- struct page **pagep, void **fsdata)
-{
- struct gfs2_inode *ip = GFS2_I(mapping->host);
- struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
- struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
- unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
- unsigned requested = 0;
- int alloc_required;
- int error = 0;
- pgoff_t index = pos >> PAGE_SHIFT;
- unsigned from = pos & (PAGE_SIZE - 1);
- struct page *page;
-
- gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
- error = gfs2_glock_nq(&ip->i_gh);
- if (unlikely(error))
- goto out_uninit;
- if (&ip->i_inode == sdp->sd_rindex) {
- error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE,
- GL_NOCACHE, &m_ip->i_gh);
- if (unlikely(error)) {
- gfs2_glock_dq(&ip->i_gh);
- goto out_uninit;
- }
- }
-
- alloc_required = gfs2_write_alloc_required(ip, pos, len);
-
- if (alloc_required || gfs2_is_jdata(ip))
- gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks);
-
- if (alloc_required) {
- struct gfs2_alloc_parms ap = { .aflags = 0, };
- requested = data_blocks + ind_blocks;
- ap.target = requested;
- error = gfs2_quota_lock_check(ip, &ap);
- if (error)
- goto out_unlock;
-
- error = gfs2_inplace_reserve(ip, &ap);
- if (error)
- goto out_qunlock;
- }
-
- rblocks = RES_DINODE + ind_blocks;
- if (gfs2_is_jdata(ip))
- rblocks += data_blocks ? data_blocks : 1;
- if (ind_blocks || data_blocks)
- rblocks += RES_STATFS + RES_QUOTA;
- if (&ip->i_inode == sdp->sd_rindex)
- rblocks += 2 * RES_STATFS;
- if (alloc_required)
- rblocks += gfs2_rg_blocks(ip, requested);
-
- error = gfs2_trans_begin(sdp, rblocks,
- PAGE_SIZE/sdp->sd_sb.sb_bsize);
- if (error)
- goto out_trans_fail;
-
- error = -ENOMEM;
- flags |= AOP_FLAG_NOFS;
- page = grab_cache_page_write_begin(mapping, index, flags);
- *pagep = page;
- if (unlikely(!page))
- goto out_endtrans;
-
- if (gfs2_is_stuffed(ip)) {
- error = 0;
- if (pos + len > gfs2_max_stuffed_size(ip)) {
- error = gfs2_unstuff_dinode(ip, page);
- if (error == 0)
- goto prepare_write;
- } else if (!PageUptodate(page)) {
- error = stuffed_readpage(ip, page);
- }
- goto out;
- }
-
-prepare_write:
- error = __block_write_begin(page, from, len, gfs2_block_map);
-out:
- if (error == 0)
- return 0;
-
- unlock_page(page);
- put_page(page);
-
- gfs2_trans_end(sdp);
- if (alloc_required) {
- gfs2_inplace_release(ip);
- if (pos + len > ip->i_inode.i_size)
- gfs2_trim_blocks(&ip->i_inode);
- }
- goto out_qunlock;
-
-out_endtrans:
- gfs2_trans_end(sdp);
-out_trans_fail:
- if (alloc_required)
- gfs2_inplace_release(ip);
-out_qunlock:
- if (alloc_required)
- gfs2_quota_unlock(ip);
-out_unlock:
- if (&ip->i_inode == sdp->sd_rindex) {
- gfs2_glock_dq(&m_ip->i_gh);
- gfs2_holder_uninit(&m_ip->i_gh);
- }
- gfs2_glock_dq(&ip->i_gh);
-out_uninit:
- gfs2_holder_uninit(&ip->i_gh);
- return error;
-}
-
/**
* adjust_fs_space - Adjusts the free space available due to gfs2_grow
* @inode: the rindex inode
@@ -848,84 +719,6 @@ int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
return copied;
}
-/**
- * gfs2_write_end
- * @file: The file to write to
- * @mapping: The address space to write to
- * @pos: The file position
- * @len: The length of the data
- * @copied: How much was actually copied by the VFS
- * @page: The page that has been written
- * @fsdata: The fsdata (unused in GFS2)
- *
- * The main write_end function for GFS2. We just put our locking around the VFS
- * provided functions.
- *
- * Returns: copied bytes or errno
- */
-
-static int gfs2_write_end(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned copied,
- struct page *page, void *fsdata)
-{
- struct inode *inode = page->mapping->host;
- struct gfs2_inode *ip = GFS2_I(inode);
- struct gfs2_sbd *sdp = GFS2_SB(inode);
- struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
- struct buffer_head *dibh;
- int ret;
- struct gfs2_trans *tr = current->journal_info;
- BUG_ON(!tr);
-
- BUG_ON(gfs2_glock_is_locked_by_me(ip->i_gl) == NULL);
-
- ret = gfs2_meta_inode_buffer(ip, &dibh);
- if (unlikely(ret))
- goto out;
-
- if (gfs2_is_stuffed(ip)) {
- ret = gfs2_stuffed_write_end(inode, dibh, pos, copied, page);
- page = NULL;
- goto out2;
- }
-
- if (gfs2_is_jdata(ip))
- gfs2_page_add_databufs(ip, page, pos & ~PAGE_MASK, len);
- else
- gfs2_ordered_add_inode(ip);
-
- ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
- page = NULL;
- if (tr->tr_num_buf_new)
- __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
- else
- gfs2_trans_add_meta(ip->i_gl, dibh);
-
-out2:
- if (inode == sdp->sd_rindex) {
- adjust_fs_space(inode);
- sdp->sd_rindex_uptodate = 0;
- }
-
- brelse(dibh);
-out:
- if (page) {
- unlock_page(page);
- put_page(page);
- }
- gfs2_trans_end(sdp);
- gfs2_inplace_release(ip);
- if (ip->i_qadata && ip->i_qadata->qa_qd_num)
- gfs2_quota_unlock(ip);
- if (inode == sdp->sd_rindex) {
- gfs2_glock_dq(&m_ip->i_gh);
- gfs2_holder_uninit(&m_ip->i_gh);
- }
- gfs2_glock_dq(&ip->i_gh);
- gfs2_holder_uninit(&ip->i_gh);
- return ret;
-}
-
/**
* jdata_set_page_dirty - Page dirtying function
* @page: The page to dirty
@@ -1093,8 +886,6 @@ static const struct address_space_operations gfs2_writeback_aops = {
.writepages = gfs2_writepages,
.readpage = gfs2_readpage,
.readpages = gfs2_readpages,
- .write_begin = gfs2_write_begin,
- .write_end = gfs2_write_end,
.bmap = gfs2_bmap,
.invalidatepage = gfs2_invalidatepage,
.releasepage = gfs2_releasepage,
@@ -1109,8 +900,6 @@ static const struct address_space_operations gfs2_ordered_aops = {
.writepages = gfs2_writepages,
.readpage = gfs2_readpage,
.readpages = gfs2_readpages,
- .write_begin = gfs2_write_begin,
- .write_end = gfs2_write_end,
.set_page_dirty = __set_page_dirty_buffers,
.bmap = gfs2_bmap,
.invalidatepage = gfs2_invalidatepage,
@@ -1126,8 +915,6 @@ static const struct address_space_operations gfs2_jdata_aops = {
.writepages = gfs2_jdata_writepages,
.readpage = gfs2_readpage,
.readpages = gfs2_readpages,
- .write_begin = gfs2_write_begin,
- .write_end = gfs2_write_end,
.set_page_dirty = jdata_set_page_dirty,
.bmap = gfs2_bmap,
.invalidatepage = gfs2_invalidatepage,
--
2.17.1
^ permalink raw reply related [flat|nested] 22+ messages in thread
* Re: [PATCH v9 1/5] iomap: add private pointer to struct iomap
2018-06-15 12:19 ` [Cluster-devel] " Andreas Gruenbacher
@ 2018-06-18 15:25 ` Andreas Gruenbacher
-1 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-18 15:25 UTC (permalink / raw)
To: Christoph Hellwig; +Cc: linux-fsdevel, cluster-devel
Hi Christoph,
On 15 June 2018 at 14:19, Andreas Gruenbacher <agruenba@redhat.com> wrote:
> Add a private pointer to struct iomap to allow filesystems to pass data
> from iomap_begin to iomap_end. Will be used by gfs2 for passing on the
> on-disk inode buffer head.
>
> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
> ---
> include/linux/iomap.h | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/include/linux/iomap.h b/include/linux/iomap.h
> index 43cc9208599f..9962dcb836b9 100644
> --- a/include/linux/iomap.h
> +++ b/include/linux/iomap.h
> @@ -59,6 +59,7 @@ struct iomap {
> struct dax_device *dax_dev;
> void *inline_data;
> };
> + void *private; /* filesystem private */
>
> /*
> * Called when finished processing a page in the mapping returned in
> --
> 2.17.1
any objections? If not, could you please add this to the shared branch?
Thanks,
Andreas
^ permalink raw reply [flat|nested] 22+ messages in thread
* [Cluster-devel] [PATCH v9 1/5] iomap: add private pointer to struct iomap
@ 2018-06-18 15:25 ` Andreas Gruenbacher
0 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-18 15:25 UTC (permalink / raw)
To: cluster-devel.redhat.com
Hi Christoph,
On 15 June 2018 at 14:19, Andreas Gruenbacher <agruenba@redhat.com> wrote:
> Add a private pointer to struct iomap to allow filesystems to pass data
> from iomap_begin to iomap_end. Will be used by gfs2 for passing on the
> on-disk inode buffer head.
>
> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
> ---
> include/linux/iomap.h | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/include/linux/iomap.h b/include/linux/iomap.h
> index 43cc9208599f..9962dcb836b9 100644
> --- a/include/linux/iomap.h
> +++ b/include/linux/iomap.h
> @@ -59,6 +59,7 @@ struct iomap {
> struct dax_device *dax_dev;
> void *inline_data;
> };
> + void *private; /* filesystem private */
>
> /*
> * Called when finished processing a page in the mapping returned in
> --
> 2.17.1
any objections? If not, could you please add this to the shared branch?
Thanks,
Andreas
^ permalink raw reply [flat|nested] 22+ messages in thread
* Re: [PATCH v9 1/5] iomap: add private pointer to struct iomap
2018-06-15 12:19 ` [Cluster-devel] " Andreas Gruenbacher
@ 2018-06-19 6:29 ` Christoph Hellwig
-1 siblings, 0 replies; 22+ messages in thread
From: Christoph Hellwig @ 2018-06-19 6:29 UTC (permalink / raw)
To: Andreas Gruenbacher; +Cc: cluster-devel, Christoph Hellwig, linux-fsdevel
On Fri, Jun 15, 2018 at 02:19:18PM +0200, Andreas Gruenbacher wrote:
> Add a private pointer to struct iomap to allow filesystems to pass data
> from iomap_begin to iomap_end. Will be used by gfs2 for passing on the
> on-disk inode buffer head.
>
> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Looks good,
Reviewed-by: Christoph Hellwig <hch@lst.de>
^ permalink raw reply [flat|nested] 22+ messages in thread
* [Cluster-devel] [PATCH v9 1/5] iomap: add private pointer to struct iomap
@ 2018-06-19 6:29 ` Christoph Hellwig
0 siblings, 0 replies; 22+ messages in thread
From: Christoph Hellwig @ 2018-06-19 6:29 UTC (permalink / raw)
To: cluster-devel.redhat.com
On Fri, Jun 15, 2018 at 02:19:18PM +0200, Andreas Gruenbacher wrote:
> Add a private pointer to struct iomap to allow filesystems to pass data
> from iomap_begin to iomap_end. Will be used by gfs2 for passing on the
> on-disk inode buffer head.
>
> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Looks good,
Reviewed-by: Christoph Hellwig <hch@lst.de>
^ permalink raw reply [flat|nested] 22+ messages in thread
* Re: [PATCH v9 2/5] gfs2: iomap buffered write support
2018-06-15 12:19 ` [Cluster-devel] " Andreas Gruenbacher
@ 2018-06-19 6:36 ` Christoph Hellwig
-1 siblings, 0 replies; 22+ messages in thread
From: Christoph Hellwig @ 2018-06-19 6:36 UTC (permalink / raw)
To: Andreas Gruenbacher; +Cc: cluster-devel, Christoph Hellwig, linux-fsdevel
> +/*
> + * Copyright (C) 2017 Red Hat, Inc. All rights reserved.
> + *
> + * This copyrighted material is made available to anyone wishing to use,
> + * modify, copy, or redistribute it subject to the terms and conditions
> + * of the GNU General Public License version 2.
> + */
Replace with an SPDX tag, please.
> +static int gfs2_iomap_begin_write(struct inode *inode, loff_t pos, loff_t length,
overly long line.
> + gfs2_write_calc_reserv(ip, iomap->length, &data_blocks, &ind_blocks);
plus a few more down the function.
> + if (iocb->ki_flags & IOCB_DIRECT)
> + return generic_file_write_iter(iocb, from);
This looks odd, as generic_file_write_iter duplicate the code
below to a large extent, but it's probably ok.
> @@ -754,7 +786,7 @@ static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
> if (error)
> goto out;
> offset = iomap.offset + iomap.length;
> - if (iomap.type != IOMAP_HOLE)
> + if (!(iomap.flags & IOMAP_F_NEW))
> continue;
shouldn't this be a separate patch?
^ permalink raw reply [flat|nested] 22+ messages in thread
* [Cluster-devel] [PATCH v9 2/5] gfs2: iomap buffered write support
@ 2018-06-19 6:36 ` Christoph Hellwig
0 siblings, 0 replies; 22+ messages in thread
From: Christoph Hellwig @ 2018-06-19 6:36 UTC (permalink / raw)
To: cluster-devel.redhat.com
> +/*
> + * Copyright (C) 2017 Red Hat, Inc. All rights reserved.
> + *
> + * This copyrighted material is made available to anyone wishing to use,
> + * modify, copy, or redistribute it subject to the terms and conditions
> + * of the GNU General Public License version 2.
> + */
Replace with an SPDX tag, please.
> +static int gfs2_iomap_begin_write(struct inode *inode, loff_t pos, loff_t length,
overly long line.
> + gfs2_write_calc_reserv(ip, iomap->length, &data_blocks, &ind_blocks);
plus a few more down the function.
> + if (iocb->ki_flags & IOCB_DIRECT)
> + return generic_file_write_iter(iocb, from);
This looks odd, as generic_file_write_iter duplicate the code
below to a large extent, but it's probably ok.
> @@ -754,7 +786,7 @@ static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
> if (error)
> goto out;
> offset = iomap.offset + iomap.length;
> - if (iomap.type != IOMAP_HOLE)
> + if (!(iomap.flags & IOMAP_F_NEW))
> continue;
shouldn't this be a separate patch?
^ permalink raw reply [flat|nested] 22+ messages in thread
* Re: [PATCH v9 4/5] gfs2: iomap direct I/O support
2018-06-15 12:19 ` [Cluster-devel] " Andreas Gruenbacher
@ 2018-06-19 6:42 ` Christoph Hellwig
-1 siblings, 0 replies; 22+ messages in thread
From: Christoph Hellwig @ 2018-06-19 6:42 UTC (permalink / raw)
To: Andreas Gruenbacher; +Cc: cluster-devel, Christoph Hellwig, linux-fsdevel
> } else if (flags & IOMAP_WRITE) {
> u64 size;
> +
> + if (flags & IOMAP_DIRECT)
> + goto out;
> +
Maybe add a comment here on why you don't allow block allocations for
direct I/O.
> + if (flags & IOMAP_DIRECT) {
> + ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
> + release_metapath(&mp);
> + if (iomap->type != IOMAP_MAPPED)
> + ret = -ENOTBLK;
> + } else {
> + ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap);
> + }
A couple too long lines.
> } else {
> ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
> release_metapath(&mp);
But shouldn't the direct I/O code try to reuse this part anyway?
E.g. something like:
if ((flags & (IOMAP_WRITE | IOMAP_DIRECT)) == IOMAP_WRITE)) {
ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap);
} else {
ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
release_metapath(&mp);
if ((flags & IOMAP_WRITE) && iomap->type != IOMAP_MAPPED)
ret = -ENOTBLK;
> + /* fall back to buffered I/O for stuffed files */
> + ret = -ENOTBLK;
> + if (gfs2_is_stuffed(ip))
> + goto out;
I think we can handle stuffed files in the direct I/O code trivially
by copying out the inline data in the iomap. It would be great to
just handle this instead of adding fallbacks.
> + /* Silently fall back to buffered I/O for stuffed files */
> + if (gfs2_is_stuffed(ip))
> + goto out;
Same here.
> +static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
> +{
> + ssize_t ret;
> +
> + if (iocb->ki_flags & IOCB_DIRECT) {
> + ret = gfs2_file_direct_read(iocb, to);
> + if (likely(ret != -ENOTBLK))
> + goto out;
return ret;
> + iocb->ki_flags &= ~IOCB_DIRECT;
> + }
> + ret = generic_file_read_iter(iocb, to);
> +out:
> + return ret;
return generic_file_read_iter(iocb, to);
^ permalink raw reply [flat|nested] 22+ messages in thread
* [Cluster-devel] [PATCH v9 4/5] gfs2: iomap direct I/O support
@ 2018-06-19 6:42 ` Christoph Hellwig
0 siblings, 0 replies; 22+ messages in thread
From: Christoph Hellwig @ 2018-06-19 6:42 UTC (permalink / raw)
To: cluster-devel.redhat.com
> } else if (flags & IOMAP_WRITE) {
> u64 size;
> +
> + if (flags & IOMAP_DIRECT)
> + goto out;
> +
Maybe add a comment here on why you don't allow block allocations for
direct I/O.
> + if (flags & IOMAP_DIRECT) {
> + ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
> + release_metapath(&mp);
> + if (iomap->type != IOMAP_MAPPED)
> + ret = -ENOTBLK;
> + } else {
> + ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap);
> + }
A couple too long lines.
> } else {
> ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
> release_metapath(&mp);
But shouldn't the direct I/O code try to reuse this part anyway?
E.g. something like:
if ((flags & (IOMAP_WRITE | IOMAP_DIRECT)) == IOMAP_WRITE)) {
ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap);
} else {
ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
release_metapath(&mp);
if ((flags & IOMAP_WRITE) && iomap->type != IOMAP_MAPPED)
ret = -ENOTBLK;
> + /* fall back to buffered I/O for stuffed files */
> + ret = -ENOTBLK;
> + if (gfs2_is_stuffed(ip))
> + goto out;
I think we can handle stuffed files in the direct I/O code trivially
by copying out the inline data in the iomap. It would be great to
just handle this instead of adding fallbacks.
> + /* Silently fall back to buffered I/O for stuffed files */
> + if (gfs2_is_stuffed(ip))
> + goto out;
Same here.
> +static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
> +{
> + ssize_t ret;
> +
> + if (iocb->ki_flags & IOCB_DIRECT) {
> + ret = gfs2_file_direct_read(iocb, to);
> + if (likely(ret != -ENOTBLK))
> + goto out;
return ret;
> + iocb->ki_flags &= ~IOCB_DIRECT;
> + }
> + ret = generic_file_read_iter(iocb, to);
> +out:
> + return ret;
return generic_file_read_iter(iocb, to);
^ permalink raw reply [flat|nested] 22+ messages in thread
* Re: [PATCH v9 4/5] gfs2: iomap direct I/O support
2018-06-19 6:42 ` [Cluster-devel] " Christoph Hellwig
@ 2018-06-20 16:00 ` Andreas Gruenbacher
-1 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-20 16:00 UTC (permalink / raw)
To: Christoph Hellwig; +Cc: cluster-devel, linux-fsdevel
On 19 June 2018 at 08:42, Christoph Hellwig <hch@lst.de> wrote:
>> } else if (flags & IOMAP_WRITE) {
>> u64 size;
>> +
>> + if (flags & IOMAP_DIRECT)
>> + goto out;
>> +
>
> Maybe add a comment here on why you don't allow block allocations for
> direct I/O.
>
>> + if (flags & IOMAP_DIRECT) {
>> + ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
>> + release_metapath(&mp);
>> + if (iomap->type != IOMAP_MAPPED)
>> + ret = -ENOTBLK;
>> + } else {
>> + ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap);
>> + }
>
> A couple too long lines.
>
>> } else {
>> ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
>> release_metapath(&mp);
>
> But shouldn't the direct I/O code try to reuse this part anyway?
>
> E.g. something like:
>
> if ((flags & (IOMAP_WRITE | IOMAP_DIRECT)) == IOMAP_WRITE)) {
> ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap);
> } else {
> ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
> release_metapath(&mp);
> if ((flags & IOMAP_WRITE) && iomap->type != IOMAP_MAPPED)
> ret = -ENOTBLK;
>
>> + /* fall back to buffered I/O for stuffed files */
>> + ret = -ENOTBLK;
>> + if (gfs2_is_stuffed(ip))
>> + goto out;
>
> I think we can handle stuffed files in the direct I/O code trivially
> by copying out the inline data in the iomap. It would be great to
> just handle this instead of adding fallbacks.
On gfs2, direct I/O uses a "deferred lock", which is a special kind of
shared lock. We can probably do inline reads under it, but not inline
writes, so falling back to buffered I/O seems inevitable in that case
at least.
>> + /* Silently fall back to buffered I/O for stuffed files */
>> + if (gfs2_is_stuffed(ip))
>> + goto out;
>
> Same here.
>
>> +static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
>> +{
>> + ssize_t ret;
>> +
>> + if (iocb->ki_flags & IOCB_DIRECT) {
>> + ret = gfs2_file_direct_read(iocb, to);
>> + if (likely(ret != -ENOTBLK))
>> + goto out;
>
> return ret;
>
>> + iocb->ki_flags &= ~IOCB_DIRECT;
>> + }
>> + ret = generic_file_read_iter(iocb, to);
>> +out:
>> + return ret;
>
> return generic_file_read_iter(iocb, to);
Andreas
^ permalink raw reply [flat|nested] 22+ messages in thread
* [Cluster-devel] [PATCH v9 4/5] gfs2: iomap direct I/O support
@ 2018-06-20 16:00 ` Andreas Gruenbacher
0 siblings, 0 replies; 22+ messages in thread
From: Andreas Gruenbacher @ 2018-06-20 16:00 UTC (permalink / raw)
To: cluster-devel.redhat.com
On 19 June 2018 at 08:42, Christoph Hellwig <hch@lst.de> wrote:
>> } else if (flags & IOMAP_WRITE) {
>> u64 size;
>> +
>> + if (flags & IOMAP_DIRECT)
>> + goto out;
>> +
>
> Maybe add a comment here on why you don't allow block allocations for
> direct I/O.
>
>> + if (flags & IOMAP_DIRECT) {
>> + ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
>> + release_metapath(&mp);
>> + if (iomap->type != IOMAP_MAPPED)
>> + ret = -ENOTBLK;
>> + } else {
>> + ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap);
>> + }
>
> A couple too long lines.
>
>> } else {
>> ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
>> release_metapath(&mp);
>
> But shouldn't the direct I/O code try to reuse this part anyway?
>
> E.g. something like:
>
> if ((flags & (IOMAP_WRITE | IOMAP_DIRECT)) == IOMAP_WRITE)) {
> ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap);
> } else {
> ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
> release_metapath(&mp);
> if ((flags & IOMAP_WRITE) && iomap->type != IOMAP_MAPPED)
> ret = -ENOTBLK;
>
>> + /* fall back to buffered I/O for stuffed files */
>> + ret = -ENOTBLK;
>> + if (gfs2_is_stuffed(ip))
>> + goto out;
>
> I think we can handle stuffed files in the direct I/O code trivially
> by copying out the inline data in the iomap. It would be great to
> just handle this instead of adding fallbacks.
On gfs2, direct I/O uses a "deferred lock", which is a special kind of
shared lock. We can probably do inline reads under it, but not inline
writes, so falling back to buffered I/O seems inevitable in that case
at least.
>> + /* Silently fall back to buffered I/O for stuffed files */
>> + if (gfs2_is_stuffed(ip))
>> + goto out;
>
> Same here.
>
>> +static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
>> +{
>> + ssize_t ret;
>> +
>> + if (iocb->ki_flags & IOCB_DIRECT) {
>> + ret = gfs2_file_direct_read(iocb, to);
>> + if (likely(ret != -ENOTBLK))
>> + goto out;
>
> return ret;
>
>> + iocb->ki_flags &= ~IOCB_DIRECT;
>> + }
>> + ret = generic_file_read_iter(iocb, to);
>> +out:
>> + return ret;
>
> return generic_file_read_iter(iocb, to);
Andreas
^ permalink raw reply [flat|nested] 22+ messages in thread
end of thread, other threads:[~2018-06-20 16:00 UTC | newest]
Thread overview: 22+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-06-15 12:19 [PATCH v9 0/5] gfs2 iomap write support Andreas Gruenbacher
2018-06-15 12:19 ` [Cluster-devel] " Andreas Gruenbacher
2018-06-15 12:19 ` [PATCH v9 1/5] iomap: add private pointer to struct iomap Andreas Gruenbacher
2018-06-15 12:19 ` [Cluster-devel] " Andreas Gruenbacher
2018-06-18 15:25 ` Andreas Gruenbacher
2018-06-18 15:25 ` [Cluster-devel] " Andreas Gruenbacher
2018-06-19 6:29 ` Christoph Hellwig
2018-06-19 6:29 ` [Cluster-devel] " Christoph Hellwig
2018-06-15 12:19 ` [PATCH v9 2/5] gfs2: iomap buffered write support Andreas Gruenbacher
2018-06-15 12:19 ` [Cluster-devel] " Andreas Gruenbacher
2018-06-19 6:36 ` Christoph Hellwig
2018-06-19 6:36 ` [Cluster-devel] " Christoph Hellwig
2018-06-15 12:19 ` [PATCH v9 3/5] gfs2: gfs2_extent_length cleanup Andreas Gruenbacher
2018-06-15 12:19 ` [Cluster-devel] " Andreas Gruenbacher
2018-06-15 12:19 ` [PATCH v9 4/5] gfs2: iomap direct I/O support Andreas Gruenbacher
2018-06-15 12:19 ` [Cluster-devel] " Andreas Gruenbacher
2018-06-19 6:42 ` Christoph Hellwig
2018-06-19 6:42 ` [Cluster-devel] " Christoph Hellwig
2018-06-20 16:00 ` Andreas Gruenbacher
2018-06-20 16:00 ` [Cluster-devel] " Andreas Gruenbacher
2018-06-15 12:19 ` [PATCH v9 5/5] gfs2: Remove gfs2_write_{begin,end} Andreas Gruenbacher
2018-06-15 12:19 ` [Cluster-devel] [PATCH v9 5/5] gfs2: Remove gfs2_write_{begin, end} Andreas Gruenbacher
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