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authorMikulas Patocka <mpatocka@redhat.com>2020-02-07 23:59:25 +0300
committerMike Snitzer <snitzer@redhat.com>2020-05-15 17:29:35 +0300
commit6fbeb0048e6b93f7b7f195864f3ddc876ac4d42e (patch)
treed4e81956f5c878632bdd583caa7bc0c3244c3b37 /include/linux/dm-bufio.h
parentd3c7b35c20d60650bac8b55c17b194adda03a979 (diff)
downloadlinux-6fbeb0048e6b93f7b7f195864f3ddc876ac4d42e.tar.xz
dm bufio: implement discard
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>
Diffstat (limited to 'include/linux/dm-bufio.h')
-rw-r--r--include/linux/dm-bufio.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/dm-bufio.h b/include/linux/dm-bufio.h
index 3c8b7d274bd9..07e1f163e299 100644
--- a/include/linux/dm-bufio.h
+++ b/include/linux/dm-bufio.h
@@ -119,6 +119,18 @@ 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.
*/