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-snap-persistent.c | 39 ++++++++++++++++++++++++++++++++------- 1 file changed, 32 insertions(+), 7 deletions(-) (limited to 'drivers/md/dm-snap-persistent.c') diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c index ba792ae068b7..169275050c0b 100644 --- a/drivers/md/dm-snap-persistent.c +++ b/drivers/md/dm-snap-persistent.c @@ -13,6 +13,7 @@ #include #include #include +#include "dm-bufio.h" #define DM_MSG_PREFIX "persistent snapshot" #define DM_CHUNK_SIZE_DEFAULT_SECTORS 32 /* 16KB */ @@ -495,27 +496,51 @@ static int read_exceptions(struct pstore *ps, void *callback_context) { int r, full = 1; + struct dm_bufio_client *client; + + client = dm_bufio_client_create(dm_snap_cow(ps->store->snap)->bdev, + ps->store->chunk_size << SECTOR_SHIFT, + 1, 0, NULL, NULL); + + if (IS_ERR(client)) + return PTR_ERR(client); /* * Keeping reading chunks and inserting exceptions until * we find a partially full area. */ for (ps->current_area = 0; full; ps->current_area++) { - r = area_io(ps, READ); - if (r) - return r; + struct dm_buffer *bp; + void *area; + chunk_t chunk = area_location(ps, ps->current_area); + + area = dm_bufio_read(client, chunk, &bp); + if (unlikely(IS_ERR(area))) { + r = PTR_ERR(area); + goto ret_destroy_bufio; + } - r = insert_exceptions(ps, ps->area, callback, callback_context, + r = insert_exceptions(ps, area, callback, callback_context, &full); - if (r) - return r; + + dm_bufio_release(bp); + + dm_bufio_forget(client, chunk); + + if (unlikely(r)) + goto ret_destroy_bufio; } ps->current_area--; skip_metadata(ps); - return 0; + r = 0; + +ret_destroy_bufio: + dm_bufio_client_destroy(client); + + return r; } static struct pstore *get_info(struct dm_exception_store *store) -- cgit v1.2.3