From 56e73ec47d749047f441e6b9d60d964535d31c3b Mon Sep 17 00:00:00 2001 From: David Chinner Date: Thu, 30 Oct 2008 17:55:27 +1100 Subject: [PATCH] [XFS] Can't lock inodes in radix tree preload region When we are inside a radix tree preload region, we cannot sleep. Recently we moved the inode locking inside the preload region for the inode radix tree. Fix that, and fix a missed unlock in another error path in the same code at the same time. SGI-PV: 987246 SGI-Modid: xfs-linux-melb:xfs-kern:32385a Signed-off-by: David Chinner Signed-off-by: Lachlan McIlroy Signed-off-by: Christoph Hellwig --- fs/xfs/xfs_iget.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c index a1f209b0596f..377c0cd14999 100644 --- a/fs/xfs/xfs_iget.c +++ b/fs/xfs/xfs_iget.c @@ -159,18 +159,19 @@ xfs_iget_cache_miss( goto out_destroy; } + if (lock_flags) + xfs_ilock(ip, lock_flags); + /* * Preload the radix tree so we can insert safely under the - * write spinlock. + * write spinlock. Note that we cannot sleep inside the preload + * region. */ if (radix_tree_preload(GFP_KERNEL)) { error = EAGAIN; - goto out_destroy; + goto out_unlock; } - if (lock_flags) - xfs_ilock(ip, lock_flags); - mask = ~(((XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog)) - 1); first_index = agino & mask; write_lock(&pag->pag_ici_lock); @@ -181,7 +182,7 @@ xfs_iget_cache_miss( WARN_ON(error != -EEXIST); XFS_STATS_INC(xs_ig_dup); error = EAGAIN; - goto out_unlock; + goto out_preload_end; } /* These values _must_ be set before releasing the radix tree lock! */ @@ -193,9 +194,12 @@ xfs_iget_cache_miss( *ipp = ip; return 0; -out_unlock: +out_preload_end: write_unlock(&pag->pag_ici_lock); radix_tree_preload_end(); +out_unlock: + if (lock_flags) + xfs_iunlock(ip, lock_flags); out_destroy: xfs_idestroy(ip); return error; -- 2.20.1