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xfs: disallow LARP on old fses

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Before enabling logged xattrs, make sure the filesystem is new enough
 that it actually supports log incompat features.
 
 This has been lightly tested with fstests.  Enjoy!
 
 Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Merge tag 'fix-larp-requirements-6.6_2023-09-12' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into xfs-6.6-fixesA

xfs: disallow LARP on old fses

Before enabling logged xattrs, make sure the filesystem is new enough
that it actually supports log incompat features.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

* tag 'fix-larp-requirements-6.6_2023-09-12' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux:
  xfs: require a relatively recent V5 filesystem for LARP mode
This commit is contained in:
Chandan Babu R 2023-09-13 10:33:27 +05:30
commit 6ebb6500e5
1 changed files with 11 additions and 0 deletions
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11
fs/xfs/xfs_xattr.c
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@ -46,6 +46,17 @@ xfs_attr_grab_log_assist(
if (xfs_sb_version_haslogxattrs(&mp->m_sb))
return 0;
/*
* Check if the filesystem featureset is new enough to set this log
* incompat feature bit. Strictly speaking, the minimum requirement is
* a V5 filesystem for the superblock field, but we'll require rmap
* or reflink to avoid having to deal with really old kernels.
*/
if (!xfs_has_reflink(mp) && !xfs_has_rmapbt(mp)) {
error = -EOPNOTSUPP;
goto drop_incompat;
}
/* Enable log-assisted xattrs. */
error = xfs_add_incompat_log_feature(mp,
XFS_SB_FEAT_INCOMPAT_LOG_XATTRS);