Message ID | 56729F1F.1020701@sandisk.com (mailing list archive) |
---|---|
State | Not Applicable, archived |
Delegated to: | Mike Snitzer |
Headers | show
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Petersen" <martin.petersen@oracle.com>, Mike Snitzer <snitzer@redhat.com>, "linux-block@vger.kernel.org" <linux-block@vger.kernel.org>, device-mapper development <dm-devel@redhat.com>, Dmitry Monakhov <dmonakhov@openvz.org>, Christoph Hellwig <hch@lst.de> Subject: [dm-devel] [PATCH 2/6] block: Introduce bio_add_zero_pages() X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk Reply-To: device-mapper development <dm-devel@redhat.com> List-Id: device-mapper development <dm-devel.redhat.com> List-Unsubscribe: <https://www.redhat.com/mailman/options/dm-devel>, <mailto:dm-devel-request@redhat.com?subject=unsubscribe> List-Archive: <https://www.redhat.com/archives/dm-devel> List-Post: <mailto:dm-devel@redhat.com> List-Help: <mailto:dm-devel-request@redhat.com?subject=help> List-Subscribe: <https://www.redhat.com/mailman/listinfo/dm-devel>, <mailto:dm-devel-request@redhat.com?subject=subscribe> Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP |
Looks good,
Reviewed-by: Christoph Hellwig <hch@lst.de>
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diff --git a/block/blk-lib.c b/block/blk-lib.c index 2f4c6b2..f44ec95 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -219,6 +219,22 @@ int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, } EXPORT_SYMBOL(blkdev_issue_write_same); +static void bio_add_zero_pages(struct bio *bio, sector_t nr_sects) +{ + unsigned sz; + int ret; + + /* Avoid that bi_size overflows */ + nr_sects = min_t(sector_t, nr_sects, UINT_MAX >> 9); + + for (; nr_sects != 0; nr_sects -= ret >> 9) { + sz = min_t(unsigned, PAGE_SIZE >> 9, nr_sects) << 9; + ret = bio_add_page(bio, ZERO_PAGE(0), sz, 0); + if (ret < sz) + break; + } +} + /** * blkdev_issue_zeroout - generate number of zero filed write bios * @bdev: blockdev to issue @@ -236,7 +252,6 @@ static int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, int ret; struct bio *bio; struct bio_batch bb; - unsigned int sz; DECLARE_COMPLETION_ONSTACK(wait); atomic_set(&bb.done, 1); @@ -256,16 +271,9 @@ static int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, bio->bi_bdev = bdev; bio->bi_end_io = bio_batch_end_io; bio->bi_private = &bb; - - while (nr_sects != 0) { - sz = min((sector_t) PAGE_SIZE >> 9 , nr_sects); - ret = bio_add_page(bio, ZERO_PAGE(0), sz << 9, 0); - nr_sects -= ret >> 9; - sector += ret >> 9; - if (ret < (sz << 9)) - break; - } - ret = 0; + bio_add_zero_pages(bio, nr_sects); + nr_sects -= bio->bi_iter.bi_size >> 9; + sector += bio->bi_iter.bi_size >> 9; atomic_inc(&bb.done); submit_bio(WRITE, bio); }
Move the code for adding one or more zero pages into a new function. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Jan Kara <jack@suse.cz> Cc: Christoph Hellwig <hch@lst.de> Cc: Mike Snitzer <snitzer@redhat.com> Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: Dmitry Monakhov <dmonakhov@openvz.org> --- block/blk-lib.c | 30 +++++++++++++++++++----------- 1 file changed, 19 insertions(+), 11 deletions(-)