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xfs: perag initialization should only touch m_ag_max_usable for AG 0

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commit 9789dd9e1d upstream.

We call __xfs_ag_resv_init to make a per-AG reservation for each AG.
This makes the reservation per-AG, not per-filesystem.  Therefore, it
is incorrect to adjust m_ag_max_usable for each AG.  Adjust it only
when we're reserving AG 0's blocks so that we only do it once per fs.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Darrick J. Wong
2017-09-18 09:42:09 -07:00
committed by Greg Kroah-Hartman
parent 8da6f7fbe4
commit d0fa252b20
1 changed files with 10 additions and 2 deletions
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8
fs/xfs/libxfs/xfs_ag_resv.c
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@@ -156,6 +156,7 @@ __xfs_ag_resv_free(
trace_xfs_ag_resv_free(pag, type, 0); trace_xfs_ag_resv_free(pag, type, 0);
resv = xfs_perag_resv(pag, type); resv = xfs_perag_resv(pag, type);
if (pag->pag_agno == 0)
pag->pag_mount->m_ag_max_usable += resv->ar_asked; pag->pag_mount->m_ag_max_usable += resv->ar_asked;
/* /*
* AGFL blocks are always considered "free", so whatever * AGFL blocks are always considered "free", so whatever
@@ -216,6 +217,13 @@ __xfs_ag_resv_init(
return error; return error;
} }
/*
* Reduce the maximum per-AG allocation length by however much we're
* trying to reserve for an AG. Since this is a filesystem-wide
* counter, we only make the adjustment for AG 0. This assumes that
* there aren't any AGs hungrier for per-AG reservation than AG 0.
*/
if (pag->pag_agno == 0)
mp->m_ag_max_usable -= ask; mp->m_ag_max_usable -= ask;
resv = xfs_perag_resv(pag, type); resv = xfs_perag_resv(pag, type);