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[XFS] Ensure "both" features2 slots are consistent

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Since older kernels may look in the sb_bad_features2 slot for flags,
rather than zeroing it out on fixup, we should make it equal to the
sb_features2 value.

Also, if the ATTR2 flag was not found prior to features2 fixup, it was not
set in the mount flags, so re-check after the fixup so that the current
session will use the feature.

Also fix up the comments to reflect these changes.

SGI-PV: 980085
SGI-Modid: xfs-linux-melb:xfs-kern:30778a

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
This commit is contained in:
Eric Sandeen
2008-04-10 12:19:34 +10:00
committed by Lachlan McIlroy
parent ee1c090825
commit e6957ea484
2 changed files with 29 additions and 15 deletions
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7
fs/xfs/xfs_sb.h
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@@ -320,11 +320,12 @@ static inline int xfs_sb_good_version(xfs_sb_t *sbp)
#endif /* __KERNEL__ */
/*
* Detect a bad features2 field
* Detect a mismatched features2 field. Older kernels read/wrote
* this into the wrong slot, so to be safe we keep them in sync.
*/
static inline int xfs_sb_has_bad_features2(xfs_sb_t *sbp)
static inline int xfs_sb_has_mismatched_features2(xfs_sb_t *sbp)
{
return (sbp->sb_bad_features2 != 0);
return (sbp->sb_bad_features2 != sbp->sb_features2);
}
static inline unsigned xfs_sb_version_tonew(unsigned v)