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authorMikulas Patocka <mpatocka@redhat.com>2012-03-28 18:41:29 +0100
committerAlasdair G Kergon <agk@redhat.com>2012-03-28 18:41:29 +0100
commita66cc28f53a7e9679dedb2bc66ddb0e0c6bdd0ee (patch)
tree0d1037562bd8a47f6e9d31d7ed56e24c7aa98c66 /drivers/md/dm-bufio.h
parent67e2e2b281812b5caf4923a38aadc6b89e34f064 (diff)
downloadlinux-a66cc28f53a7e9679dedb2bc66ddb0e0c6bdd0ee.tar.bz2
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 <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-bufio.h')
-rw-r--r--drivers/md/dm-bufio.h8
1 files changed, 8 insertions, 0 deletions
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
@@ -63,6 +63,14 @@ 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* pointer and dm_buffer pointer is no longer valid after this call.
*/