diff options
| author | Mike Snitzer <snitzer@redhat.com> | 2015-04-09 16:53:24 -0400 |
|---|---|---|
| committer | Alex Shi <alex.shi@linaro.org> | 2015-06-29 11:57:11 +0800 |
| commit | a2c92743350cfbe88562bb9d153d8f62d994302e (patch) | |
| tree | 20b759b3762c5910b9fc282125662cb31e554941 | |
| parent | 9ca6d6e13e02dd9f3959fa06e11e24e6ea37050a (diff) | |
dm crypt: leverage immutable biovecs when decrypting on read
Commit 003b5c571 ("block: Convert drivers to immutable biovecs")
stopped short of changing dm-crypt to leverage the fact that the biovec
array of a bio will no longer be modified.
Switch to using bio_clone_fast() when cloning bios for decryption after
read.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
(cherry picked from commit 5977907937afa2b5584a874d44ba6c0f56aeaa9c)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
| -rw-r--r-- | drivers/md/dm-crypt.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index ea09d5464a9f..aa1238facbeb 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -1124,15 +1124,15 @@ static void clone_init(struct dm_crypt_io *io, struct bio *clone) static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp) { struct crypt_config *cc = io->cc; - struct bio *base_bio = io->base_bio; struct bio *clone; /* - * The block layer might modify the bvec array, so always - * copy the required bvecs because we need the original - * one in order to decrypt the whole bio data *afterwards*. + * We need the original biovec array in order to decrypt + * the whole bio data *afterwards* -- thanks to immutable + * biovecs we don't need to worry about the block layer + * modifying the biovec array; so leverage bio_clone_fast(). */ - clone = bio_clone_bioset(base_bio, gfp, cc->bs); + clone = bio_clone_fast(io->base_bio, gfp, cc->bs); if (!clone) return 1; |