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xfs: remove OWN_AG rmap when allocating a block from the AGFL

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When we're really tight on space, xfs_alloc_ag_vextent_small() can
allocate a block from the AGFL and give it to the caller.  Since the
caller is never the AGFL-fixing method, we must remove the OWN_AG
reverse mapping because it will clash with whatever rmap the caller
wants to set up.  This bug was discovered by running generic/299
repeatedly.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong 2016-08-17 11:12:57 +10:00 committed by Dave Chinner
parent f32866fdc9
commit a03f1a6633
1 changed files with 13 additions and 0 deletions
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13
fs/xfs/libxfs/xfs_alloc.c
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@ -1582,6 +1582,7 @@ xfs_alloc_ag_vextent_small(
xfs_extlen_t *flenp, /* result length */
int *stat) /* status: 0-freelist, 1-normal/none */
{
struct xfs_owner_info oinfo;
int error;
xfs_agblock_t fbno;
xfs_extlen_t flen;
@ -1624,6 +1625,18 @@ xfs_alloc_ag_vextent_small(
error0);
args->wasfromfl = 1;
trace_xfs_alloc_small_freelist(args);
/*
* If we're feeding an AGFL block to something that
* doesn't live in the free space, we need to clear
* out the OWN_AG rmap.
*/
xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_AG);
error = xfs_rmap_free(args->tp, args->agbp, args->agno,
fbno, 1, &oinfo);
if (error)
goto error0;
*stat = 0;
return 0;
}