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From: Brian Foster <bfoster@redhat.com>
To: linux-xfs@vger.kernel.org
Subject: [PATCH] xfs: fix inode allocation block res calculation precedence
Date: Wed, 15 Jul 2020 15:33:10 -0400	[thread overview]
Message-ID: <20200715193310.22002-1-bfoster@redhat.com> (raw)

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>
---
 fs/xfs/libxfs/xfs_trans_space.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/libxfs/xfs_trans_space.h b/fs/xfs/libxfs/xfs_trans_space.h
index 88221c7a04cc..c6df01a2a158 100644
--- a/fs/xfs/libxfs/xfs_trans_space.h
+++ b/fs/xfs/libxfs/xfs_trans_space.h
@@ -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)))
 
 /*
-- 
2.21.3


             reply	other threads:[~2020-07-15 19:33 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-15 19:33 Brian Foster [this message]
2020-07-15 22:29 ` [PATCH] xfs: fix inode allocation block res calculation precedence Dave Chinner
2020-07-16  1:47   ` Darrick J. Wong
2020-07-16  2:02     ` Dave Chinner
2020-07-16 12:18       ` Brian Foster
2020-07-17 17:16         ` Eric Sandeen
2020-07-17 20:07           ` Darrick J. Wong
2020-07-16 12:18 ` [PATCH 2/2] xfs: replace ialloc space res macro with inline helper Brian Foster
2020-07-16 22:01   ` Dave Chinner
2020-07-17 12:25     ` Brian Foster
2020-07-21 15:01 ` [PATCH] xfs: fix inode allocation block res calculation precedence Christoph Hellwig

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