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xfs: do not use logged xattr updates on V4 filesystems

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V4 superblocks do not contain the log_incompat feature bit, which means
that we cannot protect xattr log items against kernels that are too old
to know how to recover them.  Turn off the log items for such
filesystems and adjust the "delayed" name to reflect what it's really
controlling.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong 2022-05-23 08:41:03 +10:00 committed by Dave Chinner
parent e3c5de2202
commit 22a68ba724
2 changed files with 5 additions and 4 deletions
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6
fs/xfs/libxfs/xfs_attr.c
View file

@ -982,7 +982,7 @@ xfs_attr_set(
int error, local;
int rmt_blks = 0;
unsigned int total;
int delayed = xfs_has_larp(mp);
bool use_logging = xfs_has_larp(mp);
if (xfs_is_shutdown(dp->i_mount))
return -EIO;
@ -1027,7 +1027,7 @@ xfs_attr_set(
rmt_blks = xfs_attr3_rmt_blocks(mp, XFS_XATTR_SIZE_MAX);
}
if (delayed) {
if (use_logging) {
error = xfs_attr_use_log_assist(mp);
if (error)
return error;
@ -1101,7 +1101,7 @@ xfs_attr_set(
out_unlock:
xfs_iunlock(dp, XFS_ILOCK_EXCL);
drop_incompat:
if (delayed)
if (use_logging)
xlog_drop_incompat_feat(mp->m_log);
return error;

3
fs/xfs/libxfs/xfs_attr.h
View file

@ -31,7 +31,8 @@ struct xfs_attr_list_context;
static inline bool xfs_has_larp(struct xfs_mount *mp)
{
#ifdef DEBUG
return xfs_globals.larp;
/* Logged xattrs require a V5 super for log_incompat */
return xfs_has_crc(mp) && xfs_globals.larp;
#else
return false;
#endif