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xfs: reserve AG space for the refcount btree root

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Reduce the max AG usable space size so that we always have space for
the refcount btree root.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2016-10-03 09:11:24 -07:00
parent a90c00f055
commit d0e853f360
1 changed files with 2 additions and 0 deletions
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2
fs/xfs/libxfs/xfs_alloc.c
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@ -128,6 +128,8 @@ xfs_alloc_ag_max_usable(
blocks++; /* finobt root block */
if (xfs_sb_version_hasrmapbt(&mp->m_sb))
blocks++; /* rmap root block */
if (xfs_sb_version_hasreflink(&mp->m_sb))
blocks++; /* refcount root block */
return mp->m_sb.sb_agblocks - blocks;
}