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From: Allison Henderson <allison.henderson@oracle.com>
To: linux-xfs@vger.kernel.org
Subject: [PATCH v9 09/28] xfs: Add xfs_has_attr and subroutines
Date: Wed, 26 Sep 2018 03:14:48 -0700	[thread overview]
Message-ID: <1537956907-10244-10-git-send-email-allison.henderson@oracle.com> (raw)
In-Reply-To: <1537956907-10244-1-git-send-email-allison.henderson@oracle.com>

This patch adds a new functions to check for the existence of
an attribute.  Subroutines are also added to handle the cases
of leaf blocks, nodes or shortform.  We will need this later
for delayed attributes since delayed operations cannot return
error codes.

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
---
 fs/xfs/libxfs/xfs_attr.c      | 78 +++++++++++++++++++++++++++++++++++++++++++
 fs/xfs/libxfs/xfs_attr.h      |  1 +
 fs/xfs/libxfs/xfs_attr_leaf.c | 33 ++++++++++++++++++
 fs/xfs/libxfs/xfs_attr_leaf.h |  1 +
 4 files changed, 113 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index e118282..318d71e 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -53,6 +53,7 @@ STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
 STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);
 STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args, bool roll_trans);
 STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args, bool roll_trans);
+STATIC int xfs_leaf_has_attr(xfs_da_args_t *args);
 
 /*
  * Internal routines when attribute list is more than one block.
@@ -60,6 +61,7 @@ STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args, bool roll_trans);
 STATIC int xfs_attr_node_get(xfs_da_args_t *args);
 STATIC int xfs_attr_node_addname(xfs_da_args_t *args, bool roll_trans);
 STATIC int xfs_attr_node_removename(xfs_da_args_t *args, bool roll_trans);
+STATIC int xfs_attr_node_hasname(xfs_da_args_t *args);
 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
 
@@ -321,6 +323,29 @@ xfs_attr_set_args(
 }
 
 /*
+ * Return successful if attr is found, or ENOATTR if not
+ */
+int
+xfs_has_attr(
+	struct xfs_da_args      *args)
+{
+	struct xfs_inode        *dp = args->dp;
+	int                     error;
+
+	if (!xfs_inode_hasattr(dp))
+		error = -ENOATTR;
+	else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
+		ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
+		error = xfs_shortform_has_attr(args);
+	} else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
+		error = xfs_leaf_has_attr(args);
+	else
+		error = xfs_attr_node_hasname(args);
+
+	return error;
+}
+
+/*
  * Remove the attribute specified in @args.
  */
 int
@@ -858,6 +883,29 @@ xfs_attr_leaf_addname(
 }
 
 /*
+ * Return successful if attr is found, or ENOATTR if not
+ */
+STATIC int
+xfs_leaf_has_attr(
+	struct xfs_da_args      *args)
+{
+	struct xfs_buf          *bp;
+	int                     error = 0;
+
+	args->blkno = 0;
+	error = xfs_attr3_leaf_read(args->trans, args->dp,
+			args->blkno, -1, &bp);
+	if (error)
+		return error;
+
+	error = xfs_attr3_leaf_lookup_int(bp, args);
+	error = (error == -ENOATTR) ? -ENOATTR : 0;
+	xfs_trans_brelse(args->trans, bp);
+
+	return error;
+}
+
+/*
  * Remove a name from the leaf attribute list structure
  *
  * This leaf block cannot have a "remote" value, we only call this routine
@@ -1193,6 +1241,36 @@ xfs_attr_node_addname(
 }
 
 /*
+ * Return successful if attr is found, or ENOATTR if not
+ */
+STATIC int
+xfs_attr_node_hasname(
+	struct xfs_da_args	*args)
+{
+	struct xfs_da_state	*state;
+	struct xfs_inode	*dp;
+	int			retval, error;
+
+	/*
+	 * Tie a string around our finger to remind us where we are.
+	 */
+	dp = args->dp;
+	state = xfs_da_state_alloc();
+	state->args = args;
+	state->mp = dp->i_mount;
+
+	/*
+	 * Search to see if name exists, and get back a pointer to it.
+	 */
+	error = xfs_da3_node_lookup_int(state, &retval);
+	if (error || (retval != -EEXIST)) {
+		if (error == 0)
+			error = retval;
+	}
+	return error;
+}
+
+/*
  * Remove a name from a B-tree attribute list.
  *
  * This will involve walking down the Btree, and may involve joining
diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
index 406c669..b85c9c7 100644
--- a/fs/xfs/libxfs/xfs_attr.h
+++ b/fs/xfs/libxfs/xfs_attr.h
@@ -165,6 +165,7 @@ int xfs_attr_set(struct xfs_inode *dp, const unsigned char *name,
 int xfs_attr_set_args(struct xfs_da_args *args, struct xfs_buf **leaf_bp,
 		 bool roll_trans);
 int xfs_attr_remove(struct xfs_inode *dp, const unsigned char *name, int flags);
+int xfs_has_attr(struct xfs_da_args *args);
 int xfs_attr_remove_args(struct xfs_da_args *args, bool roll_trans);
 int xfs_attr_list(struct xfs_inode *dp, char *buffer, int bufsize,
 		  int flags, struct attrlist_cursor_kern *cursor);
diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c
index d127f2c..5b979c9 100644
--- a/fs/xfs/libxfs/xfs_attr_leaf.c
+++ b/fs/xfs/libxfs/xfs_attr_leaf.c
@@ -624,6 +624,39 @@ xfs_attr_fork_remove(
 }
 
 /*
+ * Return successful if attr is found, or ENOATTR if not
+ */
+int
+xfs_shortform_has_attr(
+	struct xfs_da_args	 *args)
+{
+	struct xfs_attr_shortform *sf;
+	struct xfs_attr_sf_entry *sfe;
+	int			base = sizeof(struct xfs_attr_sf_hdr);
+	int			size = 0;
+	int			end;
+	int			i;
+
+	sf = (struct xfs_attr_shortform *)args->dp->i_afp->if_u1.if_data;
+	sfe = &sf->list[0];
+	end = sf->hdr.count;
+	for (i = 0; i < end; sfe = XFS_ATTR_SF_NEXTENTRY(sfe),
+			base += size, i++) {
+		size = XFS_ATTR_SF_ENTSIZE(sfe);
+		if (sfe->namelen != args->namelen)
+			continue;
+		if (memcmp(sfe->nameval, args->name, args->namelen) != 0)
+			continue;
+		if (!xfs_attr_namesp_match(args->flags, sfe->flags))
+			continue;
+		break;
+	}
+	if (i == end)
+		return -ENOATTR;
+	return 0;
+}
+
+/*
  * Remove an attribute from the shortform attribute list structure.
  */
 int
diff --git a/fs/xfs/libxfs/xfs_attr_leaf.h b/fs/xfs/libxfs/xfs_attr_leaf.h
index 9d830ec..98dd169 100644
--- a/fs/xfs/libxfs/xfs_attr_leaf.h
+++ b/fs/xfs/libxfs/xfs_attr_leaf.h
@@ -39,6 +39,7 @@ int	xfs_attr_shortform_getvalue(struct xfs_da_args *args);
 int	xfs_attr_shortform_to_leaf(struct xfs_da_args *args,
 			struct xfs_buf **leaf_bp);
 int	xfs_attr_shortform_remove(struct xfs_da_args *args);
+int	xfs_shortform_has_attr(struct xfs_da_args *args);
 int	xfs_attr_shortform_allfit(struct xfs_buf *bp, struct xfs_inode *dp);
 int	xfs_attr_shortform_bytesfit(struct xfs_inode *dp, int bytes);
 xfs_failaddr_t xfs_attr_shortform_verify(struct xfs_inode *ip);
-- 
2.7.4

  parent reply	other threads:[~2018-09-26 16:29 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-26 10:14 [PATCH v9 00/28] Parent Pointers v9 Allison Henderson
2018-09-26 10:14 ` [PATCH v9 01/28] xfs: Move fs/xfs/xfs_attr.h to fs/xfs/libxfs/xfs_attr.h Allison Henderson
2018-09-26 10:14 ` [PATCH v9 02/28] xfs: Add helper function xfs_attr_try_sf_addname Allison Henderson
2018-10-06  3:01   ` Darrick J. Wong
2018-10-06  3:13     ` Dave Chinner
2018-09-26 10:14 ` [PATCH v9 03/28] xfs: Add attibute set and helper functions Allison Henderson
2018-10-06  2:51   ` Dave Chinner
2018-09-26 10:14 ` [PATCH v9 04/28] xfs: Add attibute remove " Allison Henderson
2018-09-26 10:14 ` [PATCH v9 05/28] xfs: Hold inode locks in xfs_ialloc Allison Henderson
2018-10-06  2:53   ` Dave Chinner
2018-09-26 10:14 ` [PATCH v9 06/28] xfs: Add trans toggle to attr routines Allison Henderson
2018-09-26 10:14 ` [PATCH v9 07/28] xfs: Set up infastructure for deferred attribute operations Allison Henderson
2018-09-26 10:14 ` [PATCH v9 08/28] xfs: Add xfs_attr_set_deferred and xfs_attr_remove_deferred Allison Henderson
2018-09-26 10:14 ` Allison Henderson [this message]
2018-09-26 10:14 ` [PATCH v9 10/28] xfs: Add attr context to log item Allison Henderson
2018-09-26 10:14 ` [PATCH v9 11/28] xfs: Roll delayed attr operations by returning EAGAIN Allison Henderson
2018-09-26 10:14 ` [PATCH v9 12/28] xfs: Remove roll_trans boolean Allison Henderson
2018-09-26 10:14 ` [PATCH v9 13/28] xfs: Remove all strlen calls in all xfs_attr_* functions for attr names Allison Henderson
2018-09-26 10:14 ` [PATCH v9 14/28] xfs: get directory offset when adding directory name Allison Henderson
2018-09-26 10:14 ` [PATCH v9 15/28] xfs: get directory offset when removing " Allison Henderson
2018-09-26 10:14 ` [PATCH v9 16/28] xfs: get directory offset when replacing a " Allison Henderson
2018-09-26 10:14 ` [PATCH v9 17/28] xfs: add parent pointer support to attribute code Allison Henderson
2018-09-26 10:14 ` [PATCH v9 18/28] xfs: define parent pointer xattr format Allison Henderson
2018-09-26 10:14 ` [PATCH v9 19/28] xfs: extent transaction reservations for parent attributes Allison Henderson
2018-09-26 10:14 ` [PATCH v9 20/28] xfs: parent pointer attribute creation Allison Henderson
2018-09-26 10:15 ` [PATCH v9 21/28] xfs: add parent attributes to link Allison Henderson
2018-09-26 10:15 ` [PATCH v9 22/28] xfs: remove parent pointers in unlink Allison Henderson
2018-09-26 10:15 ` [PATCH v9 23/28] xfs: Add parent pointers to rename Allison Henderson
2018-09-26 10:15 ` [PATCH v9 24/28] xfs: Add the parent pointer support to the superblock version 5 Allison Henderson
2018-09-26 10:15 ` [PATCH v9 25/28] xfs: Add helper function xfs_attr_list_context_init Allison Henderson
2018-09-26 10:15 ` [PATCH v9 26/28] xfs: Increase XFS_DEFER_OPS_NR_INODES to 4 Allison Henderson
2018-09-26 10:15 ` [PATCH v9 27/28] xfs: Add parent pointer ioctl Allison Henderson
2018-09-26 10:15 ` [PATCH v9 28/28] xfs: Add delayed attributes error tag Allison Henderson

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