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author | Christoph Hellwig <hch@infradead.org> | 2008-10-30 05:55:34 (GMT) |
---|---|---|
committer | Lachlan McIlroy <lachlan@sgi.com> | 2008-10-30 05:55:34 (GMT) |
commit | 65f1eaeac0efc968797f3ac955b85ba3f5d4f9c8 (patch) | |
tree | 149c010e3a1d4abb60021ed39d3972459f63d13d /fs/xfs/xfs_btree.h | |
parent | ce5e42db421a41b1ad0cfd68c6058566b963e14b (diff) | |
download | linux-65f1eaeac0efc968797f3ac955b85ba3f5d4f9c8.tar.xz |
[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.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/xfs/xfs_btree.h b/fs/xfs/xfs_btree.h index 5398cd0..593f82b 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__ */ |