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dm persistent data: add btree_walk

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Add dm_btree_walk to iterate through the contents of a btree.
This will be used by the dm cache target.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Joe Thornber
2013-03-01 22:45:50 +00:00
committed by Alasdair G Kergon
parent b0d8ed4d96
commit 4e7f1f9089
4 changed files with 69 additions and 0 deletions
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9
drivers/md/persistent-data/dm-btree.h
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@@ -142,4 +142,13 @@ int dm_btree_remove(struct dm_btree_info *info, dm_block_t root,
int dm_btree_find_highest_key(struct dm_btree_info *info, dm_block_t root,
uint64_t *result_keys);
/*
* Iterate through the a btree, calling fn() on each entry.
* It only works for single level trees and is internally recursive, so
* monitor stack usage carefully.
*/
int dm_btree_walk(struct dm_btree_info *info, dm_block_t root,
int (*fn)(void *context, uint64_t *keys, void *leaf),
void *context);
#endif /* _LINUX_DM_BTREE_H */