[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>
diff --git a/fs/xfs/xfs_btree.h b/fs/xfs/xfs_btree.h
index 428e81f..fefbc69 100644
--- a/fs/xfs/xfs_btree.h
+++ b/fs/xfs/xfs_btree.h
@@ -170,6 +170,7 @@
struct xfs_trans *bc_tp; /* transaction we're in, if any */
struct xfs_mount *bc_mp; /* file system mount struct */
const struct xfs_btree_ops *bc_ops;
+ uint bc_flags; /* btree features - below */
union {
xfs_alloc_rec_incore_t a;
xfs_bmbt_irec_t b;
@@ -201,6 +202,10 @@
} bc_private; /* per-btree type data */
} xfs_btree_cur_t;
+/* cursor flags */
+#define XFS_BTREE_ROOT_IN_INODE (1<<1) /* root may be variable size */
+
+
#define XFS_BTREE_NOERROR 0
#define XFS_BTREE_ERROR 1