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dm bufio: implement discard

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Add functions dm_bufio_issue_discard and dm_bufio_discard_buffers.
dm_bufio_issue_discard sends discard request to the underlying device.
dm_bufio_discard_buffers frees buffers in the range and then calls
dm_bufio_issue_discard.

Also, factor out block_to_sector for reuse in dm_bufio_issue_discard.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2020-02-07 15:59:25 -05:00 • committed by Mike Snitzer
parent d3c7b35c20
commit 6fbeb0048e
2 changed files with 76 additions and 5 deletions
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12
include/linux/dm-bufio.h
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@ -118,6 +118,18 @@ int dm_bufio_write_dirty_buffers(struct dm_bufio_client *c);
*/
int dm_bufio_issue_flush(struct dm_bufio_client *c);
/*
* Send a discard request to the underlying device.
*/
int dm_bufio_issue_discard(struct dm_bufio_client *c, sector_t block, sector_t count);
/*
* Free the specified range of buffers. If a buffer is held by other process, it
* is not freed. If a buffer is dirty, it is discarded without writeback.
* Finally, send the discard request to the device.
*/
int dm_bufio_discard_buffers(struct dm_bufio_client *c, sector_t block, sector_t count);
/*
* Like dm_bufio_release but also move the buffer to the new
* block. dm_bufio_write_dirty_buffers is needed to commit the new block.