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authorChristoph Hellwig <hch@infradead.org>2008-10-30 16:55:34 +1100
committerLachlan McIlroy <lachlan@sgi.com>2008-10-30 16:55:34 +1100
commit65f1eaeac0efc968797f3ac955b85ba3f5d4f9c8 (patch)
tree149c010e3a1d4abb60021ed39d3972459f63d13d /fs/xfs/xfs_btree.h
parentce5e42db421a41b1ad0cfd68c6058566b963e14b (diff)
[XFS] add helpers for addressing entities inside a btree block
Add new helpers in xfs_btree.c to find the record, key and block pointer entries inside a btree block. To implement this genericly the ->get_maxrecs methods and two new xfs_btree_ops entries for the key and record sizes are used. Also add a big comment describing how the addressing inside a btree block works. Note that these helpers are unused until users are introduced in the next patches and this patch will thus cause some harmless compiler warnings. SGI-PV: 985583 SGI-Modid: xfs-linux-melb:xfs-kern:32189a 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>
Diffstat (limited to 'fs/xfs/xfs_btree.h')
-rw-r--r--fs/xfs/xfs_btree.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/xfs/xfs_btree.h b/fs/xfs/xfs_btree.h
index 5398cd0d4d4d..593f82b01b6f 100644
--- a/fs/xfs/xfs_btree.h
+++ b/fs/xfs/xfs_btree.h
@@ -180,6 +180,10 @@ do { \
#define XFS_BTREE_MAXLEVELS 8 /* max of all btrees */
struct xfs_btree_ops {
+ /* size of the key and record structures */
+ size_t key_len;
+ size_t rec_len;
+
/* cursor operations */
struct xfs_btree_cur *(*dup_cursor)(struct xfs_btree_cur *);
@@ -497,6 +501,15 @@ xfs_btree_setbuf(
int lev, /* level in btree */
struct xfs_buf *bp); /* new buffer to set */
+
+/*
+ * Helpers.
+ */
+static inline int xfs_btree_get_level(struct xfs_btree_block *block)
+{
+ return be16_to_cpu(block->bb_level);
+}
+
#endif /* __KERNEL__ */