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[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 <david@fromorbit.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
This commit is contained in:
David Chinner 2008-10-30 17:55:27 +11:00 committed by Lachlan McIlroy
parent 2b7035fd74
commit 56e73ec47d
1 changed files with 11 additions and 7 deletions
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18
fs/xfs/xfs_iget.c
View File

@ -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;