dm bufio: introduce forget_buffer_locked

Introduce a function forget_buffer_locked that forgets a range of
buffers. It is more efficient than calling forget_buffer in a loop.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/dm-bufio.h b/include/linux/dm-bufio.h
index 5ec6bfbde9ae..29d255fdd5d6 100644
--- a/include/linux/dm-bufio.h
+++ b/include/linux/dm-bufio.h
@@ -137,6 +137,13 @@ void dm_bufio_release_move(struct dm_buffer *b, sector_t new_block);
 void dm_bufio_forget(struct dm_bufio_client *c, sector_t block);
 
 /*
+ * Free the given range of buffers.
+ * This is just a hint, if the buffer is in use or dirty, this function
+ * does nothing.
+ */
+void dm_bufio_forget_buffers(struct dm_bufio_client *c, sector_t block, sector_t n_blocks);
+
+/*
  * Set the minimum number of buffers before cleanup happens.
  */
 void dm_bufio_set_minimum_buffers(struct dm_bufio_client *c, unsigned n);