From a5d895a90bf57e5fe87edf48dd1852e7292d570d Mon Sep 17 00:00:00 2001 From: Joe Thornber Date: Thu, 16 Apr 2015 12:47:21 +0100 Subject: dm thin metadata: add dm_thin_find_mapped_range() Retrieve the next run of contiguously mapped blocks. Useful for working out where to break up IO. Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer --- drivers/md/dm-thin-metadata.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/md/dm-thin-metadata.h') diff --git a/drivers/md/dm-thin-metadata.h b/drivers/md/dm-thin-metadata.h index fac01a96d303..f11f14095b93 100644 --- a/drivers/md/dm-thin-metadata.h +++ b/drivers/md/dm-thin-metadata.h @@ -146,6 +146,15 @@ struct dm_thin_lookup_result { int dm_thin_find_block(struct dm_thin_device *td, dm_block_t block, int can_issue_io, struct dm_thin_lookup_result *result); +/* + * Retrieve the next run of contiguously mapped blocks. Useful for working + * out where to break up IO. Returns 0 on success, < 0 on error. + */ +int dm_thin_find_mapped_range(struct dm_thin_device *td, + dm_block_t begin, dm_block_t end, + dm_block_t *thin_begin, dm_block_t *thin_end, + dm_block_t *pool_begin, bool *maybe_shared); + /* * Obtain an unused block. */ -- cgit v1.2.1