From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chao Yu Subject: [PATCH 1/2] f2fs: add a new function to support for merging contiguous read Date: Tue, 12 Nov 2013 13:15:08 +0800 Message-ID: <000001cedf66$46a9bb70$d3fd3250$@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194] helo=mx.sourceforge.net) by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1Vg6Ki-0004DU-Sw for linux-f2fs-devel@lists.sourceforge.net; Tue, 12 Nov 2013 05:16:12 +0000 Received: from mailout3.samsung.com ([203.254.224.33]) by sog-mx-4.v43.ch3.sourceforge.com with esmtp (Exim 4.76) id 1Vg6Kh-0002VL-B9 for linux-f2fs-devel@lists.sourceforge.net; Tue, 12 Nov 2013 05:16:12 +0000 Received: from epcpsbgm2.samsung.com (epcpsbgm2 [203.254.230.27]) by mailout3.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0MW400EONXARZ0K0@mailout3.samsung.com> for linux-f2fs-devel@lists.sourceforge.net; Tue, 12 Nov 2013 14:16:04 +0900 (KST) Content-language: zh-cn List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net To: ??? Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net For better read performance, we add a new function to support for merging contiguous read as the one for write. Signed-off-by: Chao Yu --- fs/f2fs/data.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ fs/f2fs/f2fs.h | 2 ++ 2 files changed, 47 insertions(+) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index aa3438c..f30060b 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -404,6 +404,51 @@ int f2fs_readpage(struct f2fs_sb_info *sbi, struct page *page, return 0; } +void f2fs_submit_read_bio(struct f2fs_sb_info *sbi, int rw) +{ + down_read(&sbi->bio_sem); + if (sbi->read_bio) { + submit_bio(rw, sbi->read_bio); + sbi->read_bio = NULL; + } + up_read(&sbi->bio_sem); +} + +void submit_read_page(struct f2fs_sb_info *sbi, struct page *page, + block_t blk_addr, int rw) +{ + struct block_device *bdev = sbi->sb->s_bdev; + int bio_blocks; + + verify_block_addr(sbi, blk_addr); + + down_read(&sbi->bio_sem); + + if (sbi->read_bio && sbi->last_read_block != blk_addr - 1) { + submit_bio(rw, sbi->read_bio); + sbi->read_bio = NULL; + } + +alloc_new: + if (sbi->read_bio == NULL) { + bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi)); + sbi->read_bio = f2fs_bio_alloc(bdev, bio_blocks); + sbi->read_bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr); + sbi->read_bio->bi_end_io = read_end_io; + } + + if (bio_add_page(sbi->read_bio, page, PAGE_CACHE_SIZE, 0) < + PAGE_CACHE_SIZE) { + submit_bio(rw, sbi->read_bio); + sbi->read_bio = NULL; + goto alloc_new; + } + + sbi->last_read_block = blk_addr; + + up_read(&sbi->bio_sem); +} + /* * This function should be used by the data read flow only where it * does not check the "create" flag that indicates block allocation. diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 89dc750..0afdcec 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -359,6 +359,8 @@ struct f2fs_sb_info { /* for segment-related operations */ struct f2fs_sm_info *sm_info; /* segment manager */ + struct bio *read_bio; /* read bios to merge */ + sector_t last_read_block; /* last read block number */ struct bio *bio[NR_PAGE_TYPE]; /* bios to merge */ sector_t last_block_in_bio[NR_PAGE_TYPE]; /* last block number */ struct rw_semaphore bio_sem; /* IO semaphore */ -- 1.7.9.5 ------------------------------------------------------------------------------ November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231&iu=/4140/ostg.clktrk