diff options
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-crypt.c | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index f6018f5961de..682ef9e6acd3 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -457,9 +457,11 @@ static void dm_crypt_bio_destructor(struct bio *bio) /* * Generate a new unfragmented bio with the given size * This should never violate the device limitations - * May return a smaller bio when running out of pages + * May return a smaller bio when running out of pages, indicated by + * *out_of_pages set to 1. */ -static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) +static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size, + unsigned *out_of_pages) { struct crypt_config *cc = io->target->private; struct bio *clone; @@ -473,11 +475,14 @@ static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned size) return NULL; clone_init(io, clone); + *out_of_pages = 0; for (i = 0; i < nr_iovecs; i++) { page = mempool_alloc(cc->page_pool, gfp_mask); - if (!page) + if (!page) { + *out_of_pages = 1; break; + } /* * if additional pages cannot be allocated without waiting, @@ -696,6 +701,7 @@ static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) struct crypt_config *cc = io->target->private; struct bio *clone; int crypt_finished; + unsigned out_of_pages = 0; unsigned remaining = io->base_bio->bi_size; int r; @@ -710,7 +716,7 @@ static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) * so repeat the whole process until all the data can be handled. */ while (remaining) { - clone = crypt_alloc_buffer(io, remaining); + clone = crypt_alloc_buffer(io, remaining, &out_of_pages); if (unlikely(!clone)) { io->error = -ENOMEM; break; @@ -737,11 +743,15 @@ static void kcryptd_crypt_write_convert(struct dm_crypt_io *io) break; } - /* out of memory -> run queues */ - if (unlikely(remaining)) { - wait_event(cc->writeq, !atomic_read(&io->ctx.pending)); + /* + * Out of memory -> run queues + * But don't wait if split was due to the io size restriction + */ + if (unlikely(out_of_pages)) congestion_wait(WRITE, HZ/100); - } + + if (unlikely(remaining)) + wait_event(cc->writeq, !atomic_read(&io->ctx.pending)); } crypt_dec_pending(io); |