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Buev" To: CC: , Jens Axboe , "Christoph Hellwig" , "Martin K . Petersen" , Pavel Begunkov , Chaitanya Kulkarni , Mikhail Malygin , , "Alexander V. Buev" Subject: [PATCH v4 1/3] block: bio-integrity: add PI iovec to bio Date: Fri, 9 Sep 2022 15:20:38 +0300 Message-ID: <20220909122040.1098696-2-a.buev@yadro.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220909122040.1098696-1-a.buev@yadro.com> References: <20220909122040.1098696-1-a.buev@yadro.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.199.18.119] X-ClientProxiedBy: T-EXCH-02.corp.yadro.com (172.17.10.102) To T-EXCH-09.corp.yadro.com (172.17.11.59) Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Added functions to attach user PI iovec pages to bio and release this pages via bio_integrity_free. Signed-off-by: Alexander V. Buev --- block/bio-integrity.c | 163 ++++++++++++++++++++++++++++++++++++++++++ include/linux/bio.h | 8 +++ 2 files changed, 171 insertions(+) diff --git a/block/bio-integrity.c b/block/bio-integrity.c index 3f5685c00e36..bd6b74ae2c95 100644 --- a/block/bio-integrity.c +++ b/block/bio-integrity.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include "blk.h" @@ -91,6 +92,18 @@ struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, } EXPORT_SYMBOL(bio_integrity_alloc); +void bio_integrity_release_pages(struct bio *bio) +{ + struct bio_integrity_payload *bip = bio_integrity(bio); + struct bio_vec *bv = bip->bip_vec; + unsigned short i; + + for (i = 0; i < bip->bip_vcnt; i++) { + put_page(bv->bv_page); + bv++; + } +} + /** * bio_integrity_free - Free bio integrity payload * @bio: bio containing bip to be freed @@ -105,6 +118,10 @@ void bio_integrity_free(struct bio *bio) if (bip->bip_flags & BIP_BLOCK_INTEGRITY) kfree(bvec_virt(bip->bip_vec)); + else { + if (bip->bip_flags & BIP_RELEASE_PAGES) + bio_integrity_release_pages(bio); + } __bio_integrity_free(bs, bip); bio->bi_integrity = NULL; @@ -378,6 +395,152 @@ void bio_integrity_advance(struct bio *bio, unsigned int bytes_done) bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes); } +static inline +struct page **__bio_integrity_temp_pages(struct bio *bio, unsigned int nr_needed_page) +{ + unsigned int nr_avail_page = 0; + struct bio_integrity_payload *bip = bio_integrity(bio); + + if (bip->bip_max_vcnt > nr_needed_page) { + nr_avail_page = (bip->bip_max_vcnt - nr_needed_page) * + sizeof(struct bio_vec)/sizeof(struct page *); + } + + if (nr_avail_page >= nr_needed_page) + return (struct page **) (bip->bip_vec + nr_needed_page); + else { + if (bio->bi_max_vecs - bio->bi_vcnt) { + nr_avail_page = (bio->bi_max_vecs - bio->bi_vcnt) * + sizeof(struct bio_vec)/sizeof(struct page *); + if (nr_avail_page >= nr_needed_page) + return (struct page **) (bio->bi_io_vec + bio->bi_vcnt); + } + } + + return NULL; +} + +/** + * bio_integrity_add_iovec - Add PI io vector + * @bio: bio whose integrity vector to update + * @pi_iter: iov_iter pointed to data added to @bio's integrity + * + * Description: Pins pages for *pi_iov and appends them to @bio's integrity. + */ +int bio_integrity_add_iovec(struct bio *bio, struct iov_iter *pi_iter) +{ + struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); + struct bio_integrity_payload *bip; + struct page **pi_page = 0, **bio_page; + unsigned int nr_vec_page; + int ret; + ssize_t size; + size_t offset, pg_num, page_count; + + if (unlikely(!(bi && bi->flags & BLK_INTEGRITY_DEVICE_CAPABLE))) { + pr_err("Device %d:%d is not integrity capable", + MAJOR(bio->bi_bdev->bd_dev), MINOR(bio->bi_bdev->bd_dev)); + return -EINVAL; + } + + nr_vec_page = iov_iter_npages(pi_iter, + queue_max_integrity_segments(bdev_get_queue(bio->bi_bdev))); + bip = bio_integrity(bio); + if (bip) { + if (nr_vec_page > (bip->bip_max_vcnt - bip->bip_vcnt)) + return -ENOMEM; + } else { + bip = bio_integrity_alloc(bio, GFP_NOIO, nr_vec_page); + if (IS_ERR(bip)) + return PTR_ERR(bip); + } + + /* get space for page pointers array */ + bio_page = __bio_integrity_temp_pages(bio, nr_vec_page); + + if (likely(bio_page)) + pi_page = bio_page; + else { + pi_page = kcalloc(nr_vec_page, + sizeof(struct pi_page *), GFP_NOIO); + if (!pi_page) { + ret = -ENOMEM; + goto error; + } + } + + bip->bip_iter.bi_size = pi_iter->count; + bip->bio_iter = bio->bi_iter; + bip_set_seed(bip, bio->bi_iter.bi_sector); + + if (bi->flags & BLK_INTEGRITY_IP_CHECKSUM) + bip->bip_flags |= BIP_IP_CHECKSUM; + + do { + size = iov_iter_get_pages2(pi_iter, pi_page, LONG_MAX, + nr_vec_page, &offset); + if (unlikely(size <= 0)) { + pr_err("Failed to pin integrity buffer for %d:%d\n", + MAJOR(bio->bi_bdev->bd_dev), + MINOR(bio->bi_bdev->bd_dev)); + pr_err("Buffer size=%zu pages=%u err=%zi\n", + pi_iter->count, nr_vec_page, size); + ret = (size) ? size : -EFAULT; + goto error; + } + + page_count = DIV_ROUND_UP(offset + size, PAGE_SIZE); + + /* fill bio integrity biovecs the given pages */ + for (pg_num = 0; pg_num < page_count; ++pg_num) { + size_t page_len; + + page_len = min_t(size_t, PAGE_SIZE - offset, size); + ret = bio_integrity_add_page(bio, pi_page[pg_num], + page_len, offset); + if (unlikely(ret != page_len)) { + while ((1 + pg_num) > 0) { + put_page(pi_page[pg_num]); + pg_num--; + } + ret = -ENOMEM; + goto error; + } + size -= page_len; + offset = 0; + bip->bip_flags |= BIP_RELEASE_PAGES; + } + + nr_vec_page -= page_count; + + } while (pi_iter->count && nr_vec_page); + + + if (pi_iter->count) { + pr_err("Failed to pin whole integrity buffer for %d:%d\n", + MAJOR(bio->bi_bdev->bd_dev), + MINOR(bio->bi_bdev->bd_dev)); + pr_err("Data of size=%zi not pined\n", pi_iter->count); + ret = -EFAULT; + goto error; + } + + if (pi_page != bio_page) + kfree(pi_page); + + return 0; + +error: + if (bio_integrity(bio)) + bio_integrity_free(bio); + + if (pi_page && pi_page != bio_page) + kfree(pi_page); + + return ret; +} +EXPORT_SYMBOL_GPL(bio_integrity_add_iovec); + /** * bio_integrity_trim - Trim integrity vector * @bio: bio whose integrity vector to update diff --git a/include/linux/bio.h b/include/linux/bio.h index ca22b06700a9..e7e328425c90 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -317,6 +317,7 @@ enum bip_flags { BIP_CTRL_NOCHECK = 1 << 2, /* disable HBA integrity checking */ BIP_DISK_NOCHECK = 1 << 3, /* disable disk integrity checking */ BIP_IP_CHECKSUM = 1 << 4, /* IP checksum */ + BIP_RELEASE_PAGES = 1 << 5, /* release pages after io completion */ }; /* @@ -699,6 +700,7 @@ extern struct bio_integrity_payload *bio_integrity_alloc(struct bio *, gfp_t, un extern int bio_integrity_add_page(struct bio *, struct page *, unsigned int, unsigned int); extern bool bio_integrity_prep(struct bio *); extern void bio_integrity_advance(struct bio *, unsigned int); +extern int bio_integrity_add_iovec(struct bio *bio, struct iov_iter *iter); extern void bio_integrity_trim(struct bio *); extern int bio_integrity_clone(struct bio *, struct bio *, gfp_t); extern int bioset_integrity_create(struct bio_set *, int); @@ -739,6 +741,12 @@ static inline void bio_integrity_advance(struct bio *bio, return; } +static inline int bio_integrity_add_iovec(struct bio *bio, + struct iov_iter *pi_iter) +{ + return 0; +} + static inline void bio_integrity_trim(struct bio *bio) { return; -- 2.30.2