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| author | Christoph Hellwig <hch@infradead.org> | 2009-03-03 14:48:35 -0500 |
|---|---|---|
| committer | Felix Blyakher <felixb@sgi.com> | 2009-03-04 07:31:48 -0600 |
| commit | ed93ec3907f063268ced18728d0653f6199d100c (patch) | |
| tree | e9e15deaec2c4609c2097da4064beef4c6341f3e /fs/xfs/xfs_iget.c | |
| parent | e8fa6b483feebd23ded5eb01afd7a6e82b6078c6 (diff) | |
| download | linux-stable-ed93ec3907f063268ced18728d0653f6199d100c.tar.gz linux-stable-ed93ec3907f063268ced18728d0653f6199d100c.tar.bz2 linux-stable-ed93ec3907f063268ced18728d0653f6199d100c.zip | |
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>
Diffstat (limited to 'fs/xfs/xfs_iget.c')
| -rw-r--r-- | fs/xfs/xfs_iget.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c index e2fb6210d4c5..478e587087fe 100644 --- a/fs/xfs/xfs_iget.c +++ b/fs/xfs/xfs_iget.c @@ -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: |