From 55494bf2947dccdf2d98b62374fea7365dfead84 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Mon, 13 Jan 2014 19:12:36 -0500 Subject: dm snapshot: use dm-bufio Use dm-bufio for initial loading of the exceptions. Introduce a new function dm_bufio_forget that frees the given buffer. Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer --- drivers/md/dm-bufio.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'drivers/md/dm-bufio.c') diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c index 54bdd923316f..d86593721915 100644 --- a/drivers/md/dm-bufio.c +++ b/drivers/md/dm-bufio.c @@ -1350,6 +1350,28 @@ retry: } EXPORT_SYMBOL_GPL(dm_bufio_release_move); +/* + * Free the given buffer. + * + * This is just a hint, if the buffer is in use or dirty, this function + * does nothing. + */ +void dm_bufio_forget(struct dm_bufio_client *c, sector_t block) +{ + struct dm_buffer *b; + + dm_bufio_lock(c); + + b = __find(c, block); + if (b && likely(!b->hold_count) && likely(!b->state)) { + __unlink_buffer(b); + __free_buffer_wake(b); + } + + dm_bufio_unlock(c); +} +EXPORT_SYMBOL(dm_bufio_forget); + unsigned dm_bufio_get_block_size(struct dm_bufio_client *c) { return c->block_size; -- cgit v1.2.1