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xfs: prevent lockdep false positive in xfs_iget_cache_miss 

The inode can't be locked by anyone else as we just created it a few
lines above and it's not been added to any lookup data structure yet.

So use a trylock that must succeed to get around the lockdep warnings.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Alexander Beregalov <a.beregalov@gmail.com>
Reviewed-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Felix Blyakher <felixb@sgi.com>
Signed-off-by: Felix Blyakher <felixb@sgi.com>
This commit is contained in:
Christoph Hellwig 2009-03-03 14:48:35 -05:00 committed by Felix Blyakher
parent e8fa6b483f
commit ed93ec3907
1 changed files with 10 additions and 5 deletions
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15
fs/xfs/xfs_iget.c
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@ -246,9 +246,6 @@ 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. Note that we cannot sleep inside the preload
@ -256,7 +253,16 @@ xfs_iget_cache_miss(
*/
if (radix_tree_preload(GFP_KERNEL)) {
error = EAGAIN;
goto out_unlock;
goto out_destroy;
}
/*
* Because the inode hasn't been added to the radix-tree yet it can't
* be found by another thread, so we can do the non-sleeping lock here.
*/
if (lock_flags) {
if (!xfs_ilock_nowait(ip, lock_flags))
BUG();
}
mask = ~(((XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog)) - 1);
@ -284,7 +290,6 @@ xfs_iget_cache_miss(
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: