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xfs: on failed mount, force-reclaim inodes after unmounting quota controls

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When mounting fails, we must force-reclaim inodes (and disable delayed
reclaim) /after/ the realtime and quota control have let go of the
realtime and quota inodes.  Without this, we corrupt the timer list and
cause other weird problems.

Found by xfs/376 fuzzing u3.bmbt[0].lastoff on an rmap filesystem to
force a bogus post-eof extent reclaim that causes the fs to go down.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2017-11-08 16:26:49 -08:00
parent d44b47fdd1
commit 2d1d1da3d9
1 changed files with 13 additions and 2 deletions
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15
fs/xfs/xfs_mount.c
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@ -1022,10 +1022,21 @@ xfs_mountfs(
xfs_rtunmount_inodes(mp);
out_rele_rip:
IRELE(rip);
cancel_delayed_work_sync(&mp->m_reclaim_work);
xfs_reclaim_inodes(mp, SYNC_WAIT);
/* Clean out dquots that might be in memory after quotacheck. */
xfs_qm_unmount(mp);
/*
* Cancel all delayed reclaim work and reclaim the inodes directly.
* We have to do this /after/ rtunmount and qm_unmount because those
* two will have scheduled delayed reclaim for the rt/quota inodes.
*
* This is slightly different from the unmountfs call sequence
* because we could be tearing down a partially set up mount. In
* particular, if log_mount_finish fails we bail out without calling
* qm_unmount_quotas and therefore rely on qm_unmount to release the
* quota inodes.
*/
cancel_delayed_work_sync(&mp->m_reclaim_work);
xfs_reclaim_inodes(mp, SYNC_WAIT);
out_log_dealloc:
mp->m_flags |= XFS_MOUNT_UNMOUNTING;
xfs_log_mount_cancel(mp);