diff options
| author | Olaf Kirch <olaf.kirch@oracle.com> | 2007-05-09 11:32:53 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-09 21:30:46 +0200 |
| commit | 2f9941b6c55d70103c1bc3f2c7676acd9f20bf8a (patch) | |
| tree | 523af38a7f1d7f1f875ca43a8c2998a29026dd70 /drivers | |
| parent | dm crypt: fix avoid cloned bio ref after free (diff) | |
| download | linux-2f9941b6c55d70103c1bc3f2c7676acd9f20bf8a.tar.xz linux-2f9941b6c55d70103c1bc3f2c7676acd9f20bf8a.zip | |
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 <olaf.kirch@oracle.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/dm-crypt.c | 34 |
1 files changed, 6 insertions, 28 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index 1dc2c62200ee..339b575ce07f 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); |