diff options
| -rw-r--r-- | drivers/md/dm.c | 37 |
1 files changed, 18 insertions, 19 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 7cb61ab887a..41c9549b32a 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -751,15 +751,13 @@ static void __clone_and_map(struct clone_info *ci) /* * Split the bio into several clones. */ -static void __split_bio(struct mapped_device *md, struct bio *bio) +static int __split_bio(struct mapped_device *md, struct bio *bio) { struct clone_info ci; ci.map = dm_get_table(md); - if (!ci.map) { - bio_io_error(bio); - return; - } + if (unlikely(!ci.map)) + return -EIO; ci.md = md; ci.bio = bio; @@ -779,6 +777,8 @@ static void __split_bio(struct mapped_device *md, struct bio *bio) /* drop the extra reference count */ dec_pending(ci.io, 0); dm_table_put(ci.map); + + return 0; } /*----------------------------------------------------------------- * CRUD END @@ -790,7 +790,7 @@ static void __split_bio(struct mapped_device *md, struct bio *bio) */ static int dm_request(struct request_queue *q, struct bio *bio) { - int r; + int r = -EIO; int rw = bio_data_dir(bio); struct mapped_device *md = q->queuedata; @@ -815,18 +815,11 @@ static int dm_request(struct request_queue *q, struct bio *bio) while (test_bit(DMF_BLOCK_IO, &md->flags)) { up_read(&md->io_lock); - if (bio_rw(bio) == READA) { - bio_io_error(bio); - return 0; - } - - r = queue_io(md, bio); - if (r < 0) { - bio_io_error(bio); - return 0; + if (bio_rw(bio) != READA) + r = queue_io(md, bio); - } else if (r == 0) - return 0; /* deferred successfully */ + if (r <= 0) + goto out_req; /* * We're in a while loop, because someone could suspend @@ -835,8 +828,13 @@ static int dm_request(struct request_queue *q, struct bio *bio) down_read(&md->io_lock); } - __split_bio(md, bio); + r = __split_bio(md, bio); up_read(&md->io_lock); + +out_req: + if (r < 0) + bio_io_error(bio); + return 0; } @@ -1235,7 +1233,8 @@ static void __flush_deferred_io(struct mapped_device *md, struct bio *c) while (c) { n = c->bi_next; c->bi_next = NULL; - __split_bio(md, c); + if (__split_bio(md, c)) + bio_io_error(c); c = n; } } |