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xfs: fix inode allocation block res calculation precedence

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The block reservation calculation for inode allocation is supposed
to consist of the blocks required for the inode chunk plus
(maxlevels-1) of the inode btree multiplied by the number of inode
btrees in the fs (2 when finobt is enabled, 1 otherwise).

Instead, the macro returns (ialloc_blocks + 2) due to a precedence
error in the calculation logic. This leads to block reservation
overruns via generic/531 on small block filesystems with finobt
enabled. Add braces to fix the calculation and reserve the
appropriate number of blocks.

Fixes: 9d43b180af67 ("xfs: update inode allocation/free transaction reservations for finobt")
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Brian Foster 2020-07-15 18:44:50 -07:00 committed by Darrick J. Wong
parent f376b45e86
commit b2a8864728
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/libxfs/xfs_trans_space.h
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@ -57,7 +57,7 @@
XFS_DAREMOVE_SPACE_RES(mp, XFS_DATA_FORK)
#define XFS_IALLOC_SPACE_RES(mp) \
(M_IGEO(mp)->ialloc_blks + \
(xfs_sb_version_hasfinobt(&mp->m_sb) ? 2 : 1 * \
((xfs_sb_version_hasfinobt(&mp->m_sb) ? 2 : 1) * \
(M_IGEO(mp)->inobt_maxlevels - 1)))
/*