From 04e99455ea5bb17ea7c2e7bb0970168efb736242 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 25 Jan 2011 09:06:19 +0000 Subject: 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 Signed-off-by: Alex Elder --- fs/xfs/xfs_bmap.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'fs/xfs/xfs_bmap.c') 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. -- cgit v1.2.3