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dm bitset: add dm_bitset_new()

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A more efficient way of creating a populated bitset.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber
2016-09-22 10:44:41 -04:00
committed by Mike Snitzer
parent 48551054fc
commit 2151249eaa
2 changed files with 58 additions and 0 deletions
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16
drivers/md/persistent-data/dm-bitset.h
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@@ -92,6 +92,22 @@ void dm_disk_bitset_init(struct dm_transaction_manager *tm,
*/
int dm_bitset_empty(struct dm_disk_bitset *info, dm_block_t *new_root);
/*
* Creates a new bitset populated with values provided by a callback
* function. This is more efficient than creating an empty bitset,
* resizing, and then setting values since that process incurs a lot of
* copying.
*
* info - describes the array
* root - the root block of the array on disk
* size - the number of entries in the array
* fn - the callback
* context - passed to the callback
*/
typedef int (*bit_value_fn)(uint32_t index, bool *value, void *context);
int dm_bitset_new(struct dm_disk_bitset *info, dm_block_t *root,
uint32_t size, bit_value_fn fn, void *context);
/*
* Resize the bitset.
*