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| author | Christoph Hellwig <hch@lst.de> | 2023-07-24 09:54:28 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-07-24 19:55:16 -0600 |
| commit | 939e1a370330841b2c0292a483d7b38f3ee45f88 (patch) | |
| tree | df9d9005bdfe932da4040c2290bb87c03ba52cd1 /block | |
| parent | 6850b2dd5c25f27f7b74414553f047d4c12dd66c (diff) | |
| download | linux-stable-939e1a370330841b2c0292a483d7b38f3ee45f88.tar.gz linux-stable-939e1a370330841b2c0292a483d7b38f3ee45f88.tar.bz2 linux-stable-939e1a370330841b2c0292a483d7b38f3ee45f88.zip | |
block: move the BIO_CLONED checks out of __bio_try_merge_page
__bio_try_merge_page is a way too low-level helper to assert that the
bio is not cloned. Move the check into bio_add_page and
bio_iov_iter_get_pages instead, which are the high level entry points
that should enforce this variant. bio_add_hw_page already this
check, coverig the third (indirect) caller of __bio_try_merge_page.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jinyoung Choi <j-young.choi@samsung.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20230724165433.117645-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/bio.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/block/bio.c b/block/bio.c index 445be4bdd99b..3ac72e60e7f1 100644 --- a/block/bio.c +++ b/block/bio.c @@ -945,9 +945,6 @@ static inline bool page_is_mergeable(const struct bio_vec *bv, static bool __bio_try_merge_page(struct bio *bio, struct page *page, unsigned int len, unsigned int off, bool *same_page) { - if (WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED))) - return false; - if (bio->bi_vcnt > 0) { struct bio_vec *bv = &bio->bi_io_vec[bio->bi_vcnt - 1]; @@ -1127,6 +1124,9 @@ int bio_add_page(struct bio *bio, struct page *page, { bool same_page = false; + if (WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED))) + return 0; + if (!__bio_try_merge_page(bio, page, len, offset, &same_page)) { if (bio_full(bio, len)) return 0; @@ -1335,6 +1335,9 @@ int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter) { int ret = 0; + if (WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED))) + return -EIO; + if (iov_iter_is_bvec(iter)) { bio_iov_bvec_set(bio, iter); iov_iter_advance(iter, bio->bi_iter.bi_size); |