[XFS] make btree root in inode support generic

The bmap btree is rooted in the inode and not in a disk block. Make the
support for this feature more generic by adding a btree flag to for this
feature instead of relying on the XFS_BTNUM_BMAP btnum check.

Also clean up xfs_btree_get_block where this new flag is used.

Based upon a patch from Dave Chinner.

SGI-PV: 985583

SGI-Modid: xfs-linux-melb:xfs-kern:32180a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Bill O'Donnell <billodo@sgi.com>
Signed-off-by: David Chinner <david@fromorbit.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/xfs/xfs_bmap_btree.c b/fs/xfs/xfs_bmap_btree.c
index cfbdd00045cf..d9bbed676e0c 100644
--- a/fs/xfs/xfs_bmap_btree.c
+++ b/fs/xfs/xfs_bmap_btree.c
@@ -2656,6 +2656,7 @@ xfs_bmbt_init_cursor(
         cur->bc_blocklog = mp->m_sb.sb_blocklog;
 
         cur->bc_ops = &xfs_bmbt_ops;
+        cur->bc_flags = XFS_BTREE_ROOT_IN_INODE;
 
         cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
         cur->bc_private.b.ip = ip;