diff options
| author | Christoph Hellwig <hch@infradead.org> | 2011-01-25 12:06:19 +0300 |
|---|---|---|
| committer | Alex Elder <aelder@sgi.com> | 2011-02-07 22:29:06 +0300 |
| commit | 04e99455ea5bb17ea7c2e7bb0970168efb736242 (patch) | |
| tree | 6990228f08cf4ffdfe454bd3d4e88f42b23f9cf8 /fs/xfs/xfs_bmap.c | |
| parent | 24446fc66fdebbdd8baca0f44fd2a47ad77ba580 (diff) | |
| download | linux-04e99455ea5bb17ea7c2e7bb0970168efb736242.tar.xz | |
xfs: only lock the rt bitmap inode once per allocation
Currently both xfs_rtpick_extent and xfs_rtallocate_extent call
xfs_trans_iget to grab and lock the rt bitmap inode, which results in a
deadlock since the removal of the lock recursion counters in commit
"xfs: simplify inode to transaction joining"
Fix this by acquiring and locking the inode in xfs_bmap_rtalloc before
calling into xfs_rtpick_extent and xfs_rtallocate_extent.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_bmap.c')
| -rw-r--r-- | fs/xfs/xfs_bmap.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c index dc3afd7739ff..2f89af25996f 100644 --- a/fs/xfs/xfs_bmap.c +++ b/fs/xfs/xfs_bmap.c @@ -2333,6 +2333,7 @@ xfs_bmap_rtalloc( xfs_extlen_t prod = 0; /* product factor for allocators */ xfs_extlen_t ralen = 0; /* realtime allocation length */ xfs_extlen_t align; /* minimum allocation alignment */ + xfs_inode_t *ip; /* bitmap incore inode */ xfs_rtblock_t rtb; mp = ap->ip->i_mount; @@ -2365,6 +2366,16 @@ xfs_bmap_rtalloc( */ if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN) ralen = MAXEXTLEN / mp->m_sb.sb_rextsize; + + /* + * Lock out other modifications to the RT bitmap inode. + */ + error = xfs_trans_iget(mp, ap->tp, mp->m_sb.sb_rbmino, 0, + XFS_ILOCK_EXCL, &ip); + if (error) + return error; + ASSERT(ip == mp->m_rbmip); + /* * If it's an allocation to an empty file at offset 0, * pick an extent that will space things out in the rt area. |