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dm bitset: introduce cursor api

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Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber
2016-10-03 14:15:02 -04:00
committed by Mike Snitzer
parent 9f9ef0657d
commit 6fe28dbf05
2 changed files with 91 additions and 0 deletions
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drivers/md/persistent-data/dm-bitset.h
+22
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@@ -161,6 +161,28 @@ int dm_bitset_test_bit(struct dm_disk_bitset *info, dm_block_t root,
int dm_bitset_flush(struct dm_disk_bitset *info, dm_block_t root,
dm_block_t *new_root);
struct dm_bitset_cursor {
struct dm_disk_bitset *info;
struct dm_array_cursor cursor;
uint32_t entries_remaining;
uint32_t array_index;
uint32_t bit_index;
uint64_t current_bits;
};
/*
* Make sure you've flush any dm_disk_bitset and updated the root before
* using this.
*/
int dm_bitset_cursor_begin(struct dm_disk_bitset *info,
dm_block_t root, uint32_t nr_entries,
struct dm_bitset_cursor *c);
void dm_bitset_cursor_end(struct dm_bitset_cursor *c);
int dm_bitset_cursor_next(struct dm_bitset_cursor *c);
bool dm_bitset_cursor_get_value(struct dm_bitset_cursor *c);
/*----------------------------------------------------------------*/
#endif /* _LINUX_DM_BITSET_H */