Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S943110AbcJ2Ia7 (ORCPT ); Sat, 29 Oct 2016 04:30:59 -0400 Received: from mail-pf0-f193.google.com ([209.85.192.193]:34255 "EHLO mail-pf0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933163AbcJ2IMq (ORCPT ); Sat, 29 Oct 2016 04:12:46 -0400 From: Ming Lei To: Jens Axboe , linux-kernel@vger.kernel.org Cc: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, Christoph Hellwig , "Kirill A . Shutemov" , Ming Lei , Joern Engel , Prasad Joshi , logfs@logfs.org (open list:LogFS) Subject: [PATCH 11/60] fs: logfs: use bio_add_page() in __bdev_writeseg() Date: Sat, 29 Oct 2016 16:08:10 +0800 Message-Id: <1477728600-12938-12-git-send-email-tom.leiming@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1477728600-12938-1-git-send-email-tom.leiming@gmail.com> References: <1477728600-12938-1-git-send-email-tom.leiming@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2348 Lines: 90 Also this patch simplify the code a bit. Signed-off-by: Ming Lei --- fs/logfs/dev_bdev.c | 51 ++++++++++++++++++++------------------------------- 1 file changed, 20 insertions(+), 31 deletions(-) diff --git a/fs/logfs/dev_bdev.c b/fs/logfs/dev_bdev.c index 696dcdd65fdd..79be4cb0dfd8 100644 --- a/fs/logfs/dev_bdev.c +++ b/fs/logfs/dev_bdev.c @@ -72,56 +72,45 @@ static int __bdev_writeseg(struct super_block *sb, u64 ofs, pgoff_t index, { struct logfs_super *super = logfs_super(sb); struct address_space *mapping = super->s_mapping_inode->i_mapping; - struct bio *bio; + struct bio *bio = NULL; struct page *page; unsigned int max_pages; - int i; + int i, ret; max_pages = min_t(size_t, nr_pages, BIO_MAX_PAGES); - bio = bio_alloc(GFP_NOFS, max_pages); - BUG_ON(!bio); - for (i = 0; i < nr_pages; i++) { - if (i >= max_pages) { - /* Block layer cannot split bios :( */ - bio->bi_vcnt = i; - bio->bi_iter.bi_size = i * PAGE_SIZE; + if (!bio) { + bio = bio_alloc(GFP_NOFS, max_pages); + BUG_ON(!bio); + bio->bi_bdev = super->s_bdev; bio->bi_iter.bi_sector = ofs >> 9; bio->bi_private = sb; bio->bi_end_io = writeseg_end_io; bio_set_op_attrs(bio, REQ_OP_WRITE, 0); - atomic_inc(&super->s_pending_writes); - submit_bio(bio); - - ofs += i * PAGE_SIZE; - index += i; - nr_pages -= i; - i = 0; - - bio = bio_alloc(GFP_NOFS, max_pages); - BUG_ON(!bio); } page = find_lock_page(mapping, index + i); BUG_ON(!page); - bio->bi_io_vec[i].bv_page = page; - bio->bi_io_vec[i].bv_len = PAGE_SIZE; - bio->bi_io_vec[i].bv_offset = 0; + ret = bio_add_page(bio, page, PAGE_SIZE, 0); BUG_ON(PageWriteback(page)); set_page_writeback(page); unlock_page(page); + + if (!ret) { + /* Block layer cannot split bios :( */ + ofs += bio->bi_iter.bi_size; + atomic_inc(&super->s_pending_writes); + submit_bio(bio); + bio = NULL; + } + } + + if (bio) { + atomic_inc(&super->s_pending_writes); + submit_bio(bio); } - bio->bi_vcnt = nr_pages; - bio->bi_iter.bi_size = nr_pages * PAGE_SIZE; - bio->bi_bdev = super->s_bdev; - bio->bi_iter.bi_sector = ofs >> 9; - bio->bi_private = sb; - bio->bi_end_io = writeseg_end_io; - bio_set_op_attrs(bio, REQ_OP_WRITE, 0); - atomic_inc(&super->s_pending_writes); - submit_bio(bio); return 0; } -- 2.7.4