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xfs: only update mount/resv fields on success in __xfs_ag_resv_init

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Try to reserve the blocks first and only then update the fields in
or hanging off the mount structure.  This way we can call __xfs_ag_resv_init
again after a previous failure.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2017-01-25 07:49:34 -08:00 committed by Darrick J. Wong
parent 83d230eb5c
commit 4dfa2b8411
1 changed files with 14 additions and 9 deletions
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23
fs/xfs/libxfs/xfs_ag_resv.c
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@ -200,22 +200,27 @@ __xfs_ag_resv_init(
struct xfs_mount *mp = pag->pag_mount;
struct xfs_ag_resv *resv;
int error;
xfs_extlen_t reserved;
resv = xfs_perag_resv(pag, type);
if (used > ask)
ask = used;
resv->ar_asked = ask;
resv->ar_reserved = resv->ar_orig_reserved = ask - used;
mp->m_ag_max_usable -= ask;
reserved = ask - used;
trace_xfs_ag_resv_init(pag, type, ask);
error = xfs_mod_fdblocks(mp, -(int64_t)resv->ar_reserved, true);
if (error)
error = xfs_mod_fdblocks(mp, -(int64_t)reserved, true);
if (error) {
trace_xfs_ag_resv_init_error(pag->pag_mount, pag->pag_agno,
error, _RET_IP_);
return error;
}
return error;
mp->m_ag_max_usable -= ask;
resv = xfs_perag_resv(pag, type);
resv->ar_asked = ask;
resv->ar_reserved = resv->ar_orig_reserved = reserved;
trace_xfs_ag_resv_init(pag, type, ask);
return 0;
}
/* Create a per-AG block reservation. */