[XFS] add helpers for addressing entities inside a btree block

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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>

...

This commit is contained in:

Christoph Hellwig 2008-10-30 16:55:34 +11:00 • committed by Lachlan McIlroy

parent ce5e42db42

commit 65f1eaeac0

5 changed files with 152 additions and 0 deletions

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3

fs/xfs/xfs_alloc_btree.c

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3

fs/xfs/xfs_bmap_btree.c

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130

fs/xfs/xfs_btree.c

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13

fs/xfs/xfs_btree.h

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3

fs/xfs/xfs_ialloc_btree.c

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