[PATCH 7/9] xfs: switch to NOFS allocation under i_lock in xfs_attr_rmtval_set

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

xfs_attr_rmtval_set is always called with i_lock held, and i_lock is taken
in reclaim context so all allocations under it must avoid recursions into
the filesystem.

Reported by the new reclaim context tracing in lockdep.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Index: linux-2.6/fs/xfs/xfs_attr.c
===================================================================
--- linux-2.6.orig/fs/xfs/xfs_attr.c    2009-07-18 18:49:20.129533080 +0200
+++ linux-2.6/fs/xfs/xfs_attr.c 2009-07-18 18:50:01.713535041 +0200
@@ -2141,8 +2141,8 @@ xfs_attr_rmtval_set(xfs_da_args_t *args)
                dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
                blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
 
-               bp = xfs_buf_get_flags(mp->m_ddev_targp, dblkno,
-                                                       blkcnt, XFS_BUF_LOCK);
+               bp = xfs_buf_get_flags(mp->m_ddev_targp, dblkno, blkcnt,
+                                      XFS_BUF_LOCK | XBF_DONT_BLOCK);
                ASSERT(bp);
                ASSERT(!XFS_BUF_GETERROR(bp));