forked from Minki/linux
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>
This commit is contained in:
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@ -1124,15 +1124,15 @@ static void clone_init(struct dm_crypt_io *io, struct bio *clone)
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static int kcryptd_io_read(struct dm_crypt_io *io, gfp_t gfp)
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{
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struct crypt_config *cc = io->cc;
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struct bio *base_bio = io->base_bio;
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struct bio *clone;
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/*
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* The block layer might modify the bvec array, so always
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* copy the required bvecs because we need the original
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* one in order to decrypt the whole bio data *afterwards*.
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* We need the original biovec array in order to decrypt
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* the whole bio data *afterwards* -- thanks to immutable
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* biovecs we don't need to worry about the block layer
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* modifying the biovec array; so leverage bio_clone_fast().
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*/
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clone = bio_clone_bioset(base_bio, gfp, cc->bs);
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clone = bio_clone_fast(io->base_bio, gfp, cc->bs);
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if (!clone)
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return 1;
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