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authorMikulas Patocka <mpatocka@redhat.com>2020-05-27 14:04:46 +0300
committerMike Snitzer <snitzer@redhat.com>2020-06-05 03:57:38 +0300
commita1c979f330cb82cae7a3b19464f9815e43060fe3 (patch)
treed0e7a8661a2523b443ee0f7db1108c8d73a74fe6 /drivers
parentb4756d43a1dd2cfb778eb3cef3ba2efd2dcd5263 (diff)
downloadlinux-a1c979f330cb82cae7a3b19464f9815e43060fe3.tar.xz
dm bufio: delete unused and inefficient dm_bufio_discard_buffers
There is no user for this interface. If in future it is needed it can be reimplemented to walk the rbtree of buffers instead of doing block-by-block lookups. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/dm-bufio.c26
1 files changed, 0 insertions, 26 deletions
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index bf289be1ee3a..993e624e506c 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -1359,32 +1359,6 @@ int dm_bufio_issue_discard(struct dm_bufio_client *c, sector_t block, sector_t c
EXPORT_SYMBOL_GPL(dm_bufio_issue_discard);
/*
- * 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)
-{
- sector_t i;
-
- for (i = block; i < block + count; i++) {
- struct dm_buffer *b;
- dm_bufio_lock(c);
- b = __find(c, i);
- if (b && likely(!b->hold_count)) {
- wait_on_bit_io(&b->state, B_READING, TASK_UNINTERRUPTIBLE);
- wait_on_bit_io(&b->state, B_WRITING, TASK_UNINTERRUPTIBLE);
- __unlink_buffer(b);
- __free_buffer_wake(b);
- }
- dm_bufio_unlock(c);
- }
-
- return dm_bufio_issue_discard(c, block, count);
-}
-EXPORT_SYMBOL_GPL(dm_bufio_discard_buffers);
-
-/*
* We first delete any other buffer that may be at that new location.
*
* Then, we write the buffer to the original location if it was dirty.