From 2f9941b6c55d70103c1bc3f2c7676acd9f20bf8a Mon Sep 17 00:00:00 2001 From: Olaf Kirch Date: Wed, 9 May 2007 02:32:53 -0700 Subject: [PATCH] dm crypt: fix remove first_clone Get rid of first_clone in dm-crypt This gets rid of first_clone, which is not really needed. Apparently, cloned bios used to share their bvec some time way in the past - this is no longer the case. Contrarily, this even hurts us if we try to create a clone off first_clone after it has completed, and crypt_endio has destroyed its bvec. Signed-off-by: Olaf Kirch Signed-off-by: Alasdair G Kergon Cc: Jens Axboe Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/md/dm-crypt.c | 34 ++++++---------------------------- 1 file changed, 6 insertions(+), 28 deletions(-) diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index 1dc2c62..339b575 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -33,7 +33,6 @@ struct crypt_io { struct dm_target *target; struct bio *base_bio; - struct bio *first_clone; struct work_struct work; atomic_t pending; int error; @@ -380,9 +379,8 @@ static int crypt_convert(struct crypt_config *cc, * This should never violate the device limitations * May return a smaller bio when running out of pages */ -static struct bio * -crypt_alloc_buffer(struct crypt_io *io, unsigned int size, - struct bio *base_bio, unsigned int *bio_vec_idx) +static struct bio *crypt_alloc_buffer(struct crypt_io *io, unsigned int size, + unsigned int *bio_vec_idx) { struct crypt_config *cc = io->target->private; struct bio *clone; @@ -390,12 +388,7 @@ crypt_alloc_buffer(struct crypt_io *io, unsigned int size, gfp_t gfp_mask = GFP_NOIO | __GFP_HIGHMEM; unsigned int i; - if (base_bio) { - clone = bio_alloc_bioset(GFP_NOIO, base_bio->bi_max_vecs, cc->bs); - __bio_clone(clone, base_bio); - } else - clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); - + clone = bio_alloc_bioset(GFP_NOIO, nr_iovecs, cc->bs); if (!clone) return NULL; @@ -498,9 +491,6 @@ static void dec_pending(struct crypt_io *io, int error) if (!atomic_dec_and_test(&io->pending)) return; - if (io->first_clone) - bio_put(io->first_clone); - bio_endio(io->base_bio, io->base_bio->bi_size, io->error); mempool_free(io, cc->io_pool); @@ -618,8 +608,7 @@ static void process_write(struct crypt_io *io) * so repeat the whole process until all the data can be handled. */ while (remaining) { - clone = crypt_alloc_buffer(io, base_bio->bi_size, - io->first_clone, &bvec_idx); + clone = crypt_alloc_buffer(io, base_bio->bi_size, &bvec_idx); if (unlikely(!clone)) { dec_pending(io, -ENOMEM); return; @@ -635,21 +624,11 @@ static void process_write(struct crypt_io *io) } clone->bi_sector = cc->start + sector; - - if (!io->first_clone) { - /* - * hold a reference to the first clone, because it - * holds the bio_vec array and that can't be freed - * before all other clones are released - */ - bio_get(clone); - io->first_clone = clone; - } - remaining -= clone->bi_size; sector += bio_sectors(clone); - /* prevent bio_put of first_clone */ + /* Grab another reference to the io struct + * before we kick off the request */ if (remaining) atomic_inc(&io->pending); @@ -965,7 +944,6 @@ static int crypt_map(struct dm_target *ti, struct bio *bio, io = mempool_alloc(cc->io_pool, GFP_NOIO); io->target = ti; io->base_bio = bio; - io->first_clone = NULL; io->error = io->post_process = 0; atomic_set(&io->pending, 0); kcryptd_queue_io(io); -- 2.7.4