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dm bufio: prefetch

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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>
This commit is contained in:
Mikulas Patocka
2012-03-28 18:41:29 +01:00
committed by Alasdair G Kergon
parent 67e2e2b281
commit a66cc28f53
2 changed files with 90 additions and 26 deletions
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8
drivers/md/dm-bufio.h
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@@ -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* pointer and dm_buffer pointer is no longer valid after this call.