From a66cc28f53a7e9679dedb2bc66ddb0e0c6bdd0ee Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Wed, 28 Mar 2012 18:41:29 +0100 Subject: dm bufio: prefetch This patch introduces a new function dm_bufio_prefetch. It prefetches the specified range of blocks into dm-bufio cache without waiting for i/o completion. Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon --- drivers/md/dm-bufio.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/md/dm-bufio.h') diff --git a/drivers/md/dm-bufio.h b/drivers/md/dm-bufio.h index 5c4c3a04e381..b142946a9e32 100644 --- a/drivers/md/dm-bufio.h +++ b/drivers/md/dm-bufio.h @@ -62,6 +62,14 @@ void *dm_bufio_get(struct dm_bufio_client *c, sector_t block, void *dm_bufio_new(struct dm_bufio_client *c, sector_t block, struct dm_buffer **bp); +/* + * Prefetch the specified blocks to the cache. + * The function starts to read the blocks and returns without waiting for + * I/O to finish. + */ +void dm_bufio_prefetch(struct dm_bufio_client *c, + sector_t block, unsigned n_blocks); + /* * Release a reference obtained with dm_bufio_{read,get,new}. The data * pointer and dm_buffer pointer is no longer valid after this call. -- cgit v1.2.3