xfs: use hlist_add_fake

XFS does not need it's inodes to actuall be hashed in the VFS inode
cache, but we require the inode to be marked hashed for the
writeback code to work.

Insted of using insert_inode_hash, which requires a second
inode_lock roundtrip after the partial merge of the inode
scalability patches in 2.6.37-rc simply use the new hlist_add_fake
helper to mark it hashed without requiring a lock or touching a
global cache line.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

diff --git a/fs/xfs/linux-2.6/xfs_iops.c b/fs/xfs/linux-2.6/xfs_iops.c
index 96107efc0c61908c3f1a94a646604836fc2131e1..94d5fd6a2973042239bd22f19047947494f57581 100644 (file)
--- a/fs/xfs/linux-2.6/xfs_iops.c
+++ b/fs/xfs/linux-2.6/xfs_iops.c
@@ -762,7 +762,8 @@ xfs_setup_inode(
        inode->i_state = I_NEW;
 
        inode_sb_list_add(inode);
-       insert_inode_hash(inode);
+       /* make the inode look hashed for the writeback code */
+       hlist_add_fake(&inode->i_hash);
 
        inode->i_mode   = ip->i_d.di_mode;
        inode->i_nlink  = ip->i_d.di_nlink;