diff mbox series

[02/12] xfs: make xfs_attr_set require XFS_DA_OP_REMOVE

Message ID 168080823833.613065.377220236636487349.stgit@frogsfrogsfrogs (mailing list archive)
State Superseded, archived
Headers show
Series xfs: name-value xattr lookups | expand

Commit Message

Darrick J. Wong April 6, 2023, 7:17 p.m. UTC 
From: Darrick J. Wong <djwong@kernel.org>

Quite a few patches from now, we're going to change the parent pointer
xattr format to encode as much of the dirent name in the xattr name as
fits, and spill the rest of it to the xattr value.  To make this work
correctly, we'll be adding the ability to look up xattrs based on name
/and/ value.

Internally, the xattr data structure supports attributes with a zero
length value, which is how we're going to store parent pointers for
short dirent names.  The parent pointer repair code uses xfs_attr_set to
add missing and remove dangling parent pointers, so that interface must
be capable of setting an xattr with args->value == NULL.

The userspace API doesn't support this, so xfs_attr_set currently treats
a NULL args->value as a request to remove an attr.  However, that's a
quirk of the existing callers and the interface.  Make the callers of
xfs_attr_set to declare explicitly that they want to remove an xattr.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 fs/xfs/libxfs/xfs_attr.c |    9 +++++----
 fs/xfs/xfs_xattr.c       |    5 +++++
 2 files changed, 10 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index e28d93d232de..1518b786cdaa 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -967,6 +967,7 @@  xfs_attr_set(
 	struct xfs_mount	*mp = dp->i_mount;
 	struct xfs_trans_res	tres;
 	bool			rsvd = (args->attr_filter & XFS_ATTR_ROOT);
+	bool			is_remove = args->op_flags & XFS_DA_OP_REMOVE;
 	int			error, local;
 	int			rmt_blks = 0;
 	unsigned int		total;
@@ -991,7 +992,7 @@  xfs_attr_set(
 	args->op_flags = XFS_DA_OP_OKNOENT |
 					(args->op_flags & XFS_DA_OP_LOGGED);
 
-	if (args->value) {
+	if (!is_remove) {
 		XFS_STATS_INC(mp, xs_attr_set);
 		args->total = xfs_attr_calc_size(args, &local);
 
@@ -1025,7 +1026,7 @@  xfs_attr_set(
 	if (error)
 		return error;
 
-	if (args->value || xfs_inode_hasattr(dp)) {
+	if (!is_remove || xfs_inode_hasattr(dp)) {
 		error = xfs_iext_count_may_overflow(dp, XFS_ATTR_FORK,
 				XFS_IEXT_ATTR_MANIP_CNT(rmt_blks));
 		if (error == -EFBIG)
@@ -1039,7 +1040,7 @@  xfs_attr_set(
 	switch (error) {
 	case -EEXIST:
 		/* if no value, we are performing a remove operation */
-		if (!args->value) {
+		if (is_remove) {
 			error = xfs_attr_defer_remove(args);
 			break;
 		}
@@ -1051,7 +1052,7 @@  xfs_attr_set(
 		break;
 	case -ENOATTR:
 		/* Can't remove what isn't there. */
-		if (!args->value)
+		if (is_remove)
 			goto out_trans_cancel;
 
 		/* Pure replace fails if no existing attr to replace. */
diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
index 7b9a0ed1b11f..61779d92295f 100644
--- a/fs/xfs/xfs_xattr.c
+++ b/fs/xfs/xfs_xattr.c
@@ -103,6 +103,11 @@  xfs_attr_change(
 		use_logging = true;
 	}
 
+	if (args->value)
+		args->op_flags &= ~XFS_DA_OP_REMOVE;
+	else
+		args->op_flags |= XFS_DA_OP_REMOVE;
+
 	error = xfs_attr_set(args);
 
 	if (use_logging)