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block: copy back bounce buffer to user-space correctly in case of split

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Copy back the bounce buffer to user-space in entirety when the parent
bio completes. The existing code uses bip_iter.bi_size for sizing the
copy, which can be modified. So move away from that and fetch it from
the vector passed to the block layer. While at it, switch to using
better variable names.

Fixes: 492c5d4559 ("block: bio-integrity: directly map user buffers")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20241128112240.8867-3-anuj20.g@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2024-11-28 16:52:32 +05:30
committed by Jens Axboe
parent 5dbb3cbd06
commit 031141976b
1 changed files with 8 additions and 7 deletions
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block/bio-integrity.c
+8 -7
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@@ -118,17 +118,18 @@ static void bio_integrity_unpin_bvec(struct bio_vec *bv, int nr_vecs,
static void bio_integrity_uncopy_user(struct bio_integrity_payload *bip)
{
unsigned short nr_vecs = bip->bip_max_vcnt - 1;
struct bio_vec *copy = &bip->bip_vec[1];
size_t bytes = bip->bip_iter.bi_size;
struct iov_iter iter;
unsigned short orig_nr_vecs = bip->bip_max_vcnt - 1;
struct bio_vec *orig_bvecs = &bip->bip_vec[1];
struct bio_vec *bounce_bvec = &bip->bip_vec[0];
size_t bytes = bounce_bvec->bv_len;
struct iov_iter orig_iter;
int ret;
iov_iter_bvec(&iter, ITER_DEST, copy, nr_vecs, bytes);
ret = copy_to_iter(bvec_virt(bip->bip_vec), bytes, &iter);
iov_iter_bvec(&orig_iter, ITER_DEST, orig_bvecs, orig_nr_vecs, bytes);
ret = copy_to_iter(bvec_virt(bounce_bvec), bytes, &orig_iter);
WARN_ON_ONCE(ret != bytes);
bio_integrity_unpin_bvec(copy, nr_vecs, true);
bio_integrity_unpin_bvec(orig_bvecs, orig_nr_vecs, true);
}
/**