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dm array: add dm_array_new()

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dm_array_new() creates a new, populated array more efficiently than
starting with an empty one and resizing.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber 2016-09-15 08:45:44 -04:00 • committed by Mike Snitzer
parent b88efd43f9
commit dd6a77d998
2 changed files with 130 additions and 31 deletions
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19
drivers/md/persistent-data/dm-array.h
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@ -111,6 +111,25 @@ int dm_array_resize(struct dm_array_info *info, dm_block_t root,
const void *value, dm_block_t *new_root)
__dm_written_to_disk(value);
/*
* Creates a new array populated with values provided by a callback
* function. This is more efficient than creating an empty array,
* resizing, and then setting values since that process incurs a lot of
* copying.
*
* Assumes 32bit values for now since it's only used by the cache hint
* array.
*
* 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 (*value_fn)(uint32_t index, void *value_le, void *context);
int dm_array_new(struct dm_array_info *info, dm_block_t *root,
uint32_t size, value_fn fn, void *context);
/*
* Frees a whole array. The value_type's decrement operation will be called
* for all values in the array