diff options
| -rw-r--r-- | drivers/md/dm-crypt.c | 41 |
1 files changed, 40 insertions, 1 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index ad98ded3008c..046ee516074b 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -56,6 +56,7 @@ struct dm_crypt_io { atomic_t pending; int error; sector_t sector; + struct dm_crypt_io *base_io; }; struct dm_crypt_request { @@ -534,6 +535,7 @@ static struct dm_crypt_io *crypt_io_alloc(struct dm_target *ti, io->base_bio = bio; io->sector = sector; io->error = 0; + io->base_io = NULL; atomic_set(&io->pending, 0); return io; @@ -547,6 +549,7 @@ static void crypt_inc_pending(struct dm_crypt_io *io) /* * One of the bios was finished. Check for completion of * the whole request and correctly clean up the buffer. + * If base_io is set, wait for the last fragment to complete. */ static void crypt_dec_pending(struct dm_crypt_io *io) { @@ -555,7 +558,14 @@ static void crypt_dec_pending(struct dm_crypt_io *io) if (!atomic_dec_and_test(&io->pending)) return; - bio_endio(io->base_bio, io->error); + if (likely(!io->base_io)) + bio_endio(io->base_bio, io->error); + else { + if (io->error && !io->base_io->error) + io->base_io->error = io->error; + crypt_dec_pending(io->base_io); + } + mempool_free(io, cc->io_pool); } @@ -699,6 +709,7 @@ static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) { struct crypt_config *cc = io->target->private; struct bio *clone; + struct dm_crypt_io *new_io; int crypt_finished; unsigned out_of_pages = 0; unsigned remaining = io->base_bio->bi_size; @@ -753,6 +764,34 @@ static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) if (unlikely(out_of_pages)) congestion_wait(WRITE, HZ/100); + /* + * With async crypto it is unsafe to share the crypto context + * between fragments, so switch to a new dm_crypt_io structure. + */ + if (unlikely(!crypt_finished && remaining)) { + new_io = crypt_io_alloc(io->target, io->base_bio, + sector); + crypt_inc_pending(new_io); + crypt_convert_init(cc, &new_io->ctx, NULL, + io->base_bio, sector); + new_io->ctx.idx_in = io->ctx.idx_in; + new_io->ctx.offset_in = io->ctx.offset_in; + + /* + * Fragments after the first use the base_io + * pending count. + */ + if (!io->base_io) + new_io->base_io = io; + else { + new_io->base_io = io->base_io; + crypt_inc_pending(io->base_io); + crypt_dec_pending(io); + } + + io = new_io; + } + if (unlikely(remaining)) wait_event(cc->writeq, !atomic_read(&io->ctx.pending)); } |