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b=mBDbQsRsWp4tUdAo8Ly8hYeb7jRRK+vdkd5/hDneYoYfd2Xymg4piXanukwV4CLPH awn2w3rsmM7wcX+OQwTs0iXa0pKexaDXSUijCPtxvyUco3aagYUE1vL9Qs7B0ouyLq H3Ol6PedoB+Nz7OQNvmIaCoqGUKQGg4D7HFJTNbwrUng2XbvUfRU6AuQ2Wzr7O1QZE 9o1k854UhQnIbDMJuQV2YHpRR1qdwWqJiq7vv/e9vhMx/HfVyY9FcNsYiI/NGYto39 w1LXwDuEh/I8hA5li3D3HTyXUu84lBzmA+6ef1HvZ7UJ6P6Ty36uKVd6V1AzMh0+Jj MLp7D0r9f60Jw== From: Leon Romanovsky To: Marek Szyprowski , Jens Axboe , Christoph Hellwig , Keith Busch Cc: Jake Edge , Jonathan Corbet , Jason Gunthorpe , Zhu Yanjun , Robin Murphy , Joerg Roedel , Will Deacon , Sagi Grimberg , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Andrew Morton , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, Niklas Schnelle , Chuck Lever , Luis Chamberlain , Matthew Wilcox , Dan Williams , Kanchan Joshi , Chaitanya Kulkarni , Leon Romanovsky Subject: [PATCH v9 18/24] block: share more code for bio addition helper Date: Wed, 23 Apr 2025 11:13:09 +0300 Message-ID: X-Mailer: git-send-email 2.49.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 0A8851C0010 X-Stat-Signature: w49xyjmwk557y4ouiyg38hthrfcujr6a X-Rspam-User: X-HE-Tag: 1745396106-499985 X-HE-Meta: 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 BbVbKBFj aFxhie2F/8oJYxWI2AdK30yJz4f49g51ZORVN+1aCL6hFtWJOKX+pi1ORxE4pu9SilPIe+AfU5GpT889dAanGJ0q7PTHOto6kHpgRzEjQrfXowJSZn+m3M8/1NB7H4NAXbsFvypuRrJQ4nyuPZ16zZP74hHC+U2NPXp0/7Ys6mvM7zwyPGv0MZmqOgri1GPLeRoj4MSLqu3tgi2HIEw7CatcqUA4WNYwBmm7u/sud66aZ9CQ= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Christoph Hellwig __bio_iov_iter_get_pages currently open codes adding pages to the bio, which duplicates a lot of code from bio_add_page. Add bio_add_page_int helper that pass down the same_page output argument so that __bio_iov_iter_get_pages can reuse the main add bio to page helpers. Note that I'd normally call these helper __bio_add_page, but the former is already taken for an exported API. Signed-off-by: Christoph Hellwig Tested-by: Jens Axboe Signed-off-by: Leon Romanovsky --- block/bio.c | 68 +++++++++++++++++++++++++---------------------------- 1 file changed, 32 insertions(+), 36 deletions(-) diff --git a/block/bio.c b/block/bio.c index 4e6c85a33d74..3047fa3f4b32 100644 --- a/block/bio.c +++ b/block/bio.c @@ -989,20 +989,9 @@ void __bio_add_page(struct bio *bio, struct page *page, } EXPORT_SYMBOL_GPL(__bio_add_page); -/** - * bio_add_page - attempt to add page(s) to bio - * @bio: destination bio - * @page: start page to add - * @len: vec entry length, may cross pages - * @offset: vec entry offset relative to @page, may cross pages - * - * Attempt to add page(s) to the bio_vec maplist. This will only fail - * if either bio->bi_vcnt == bio->bi_max_vecs or it's a cloned bio. - */ -int bio_add_page(struct bio *bio, struct page *page, - unsigned int len, unsigned int offset) +static int bio_add_page_int(struct bio *bio, struct page *page, + unsigned int len, unsigned int offset, bool *same_page) { - bool same_page = false; if (WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED))) return 0; @@ -1011,7 +1000,7 @@ int bio_add_page(struct bio *bio, struct page *page, if (bio->bi_vcnt > 0 && bvec_try_merge_page(&bio->bi_io_vec[bio->bi_vcnt - 1], - page, len, offset, &same_page)) { + page, len, offset, same_page)) { bio->bi_iter.bi_size += len; return len; } @@ -1021,6 +1010,24 @@ int bio_add_page(struct bio *bio, struct page *page, __bio_add_page(bio, page, len, offset); return len; } + +/** + * bio_add_page - attempt to add page(s) to bio + * @bio: destination bio + * @page: start page to add + * @len: vec entry length, may cross pages + * @offset: vec entry offset relative to @page, may cross pages + * + * Attempt to add page(s) to the bio_vec maplist. Will only fail if the + * bio is full, or it is incorrectly used on a cloned bio. + */ +int bio_add_page(struct bio *bio, struct page *page, + unsigned int len, unsigned int offset) +{ + bool same_page = false; + + return bio_add_page_int(bio, page, len, offset, &same_page); +} EXPORT_SYMBOL(bio_add_page); void bio_add_folio_nofail(struct bio *bio, struct folio *folio, size_t len, @@ -1088,27 +1095,6 @@ void bio_iov_bvec_set(struct bio *bio, const struct iov_iter *iter) bio_set_flag(bio, BIO_CLONED); } -static int bio_iov_add_folio(struct bio *bio, struct folio *folio, size_t len, - size_t offset) -{ - bool same_page = false; - - if (WARN_ON_ONCE(bio->bi_iter.bi_size > UINT_MAX - len)) - return -EIO; - - if (bio->bi_vcnt > 0 && - bvec_try_merge_page(&bio->bi_io_vec[bio->bi_vcnt - 1], - folio_page(folio, 0), len, offset, - &same_page)) { - bio->bi_iter.bi_size += len; - if (same_page && bio_flagged(bio, BIO_PAGE_PINNED)) - unpin_user_folio(folio, 1); - return 0; - } - bio_add_folio_nofail(bio, folio, len, offset); - return 0; -} - static unsigned int get_contig_folio_len(unsigned int *num_pages, struct page **pages, unsigned int i, struct folio *folio, size_t left, @@ -1203,6 +1189,8 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter) for (left = size, i = 0; left > 0; left -= len, i += num_pages) { struct page *page = pages[i]; struct folio *folio = page_folio(page); + struct page *first_page = folio_page(folio, 0); + bool same_page = false; folio_offset = ((size_t)folio_page_idx(folio, page) << PAGE_SHIFT) + offset; @@ -1215,7 +1203,15 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter) len = get_contig_folio_len(&num_pages, pages, i, folio, left, offset); - bio_iov_add_folio(bio, folio, len, folio_offset); + if (bio_add_page_int(bio, first_page, len, folio_offset, + &same_page) != len) { + ret = -EINVAL; + break; + } + + if (same_page && bio_flagged(bio, BIO_PAGE_PINNED)) + unpin_user_folio(folio, 1); + offset = 0; } -- 2.49.0