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xfs: prohibit fstrim in norecovery mode

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The xfs fstrim implementation uses the free space btrees to find free
space that can be discarded.  If we haven't recovered the log, the bnobt
will be stale and we absolutely *cannot* use stale metadata to zap the
underlying storage.

Signed-off-by: Darrick J. Wong <[email protected]>
Reviewed-by: Eric Sandeen <[email protected]>
This commit is contained in:
Darrick J. Wong 2019-03-22 18:10:22 -07:00
commit ed79dac98c
1 changed files with 8 additions and 0 deletions
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8
fs/xfs/xfs_discard.c
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@ -161,6 +161,14 @@ xfs_ioc_trim(
return -EPERM;
if (!blk_queue_discard(q))
return -EOPNOTSUPP;
/*
* We haven't recovered the log, so we cannot use our bnobt-guided
* storage zapping commands.
*/
if (mp->m_flags & XFS_MOUNT_NORECOVERY)
return -EROFS;
if (copy_from_user(&range, urange, sizeof(range)))
return -EFAULT;