linux-kernel - [PATCH v1 23/27] fs: logfs: use bio_add_page() in __bdev

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Message-Id: <1460635375-28282-24-git-send-email-tom.leiming@gmail.com>
Date:	Thu, 14 Apr 2016 20:02:41 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org
Cc:	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	Ming Lei <tom.leiming@...il.com>,
	Joern Engel <joern@...fs.org>,
	Prasad Joshi <prasadjoshi.linux@...il.com>,
	logfs@...fs.org (open list:LogFS)
Subject: [PATCH v1 23/27] fs: logfs: use bio_add_page() in __bdev_writeseg()

Also this patch simplify the code a bit.

Signed-off-by: Ming Lei <tom.leiming@...il.com>
---
 fs/logfs/dev_bdev.c | 51 +++++++++++++++++++++------------------------------
 1 file changed, 21 insertions(+), 30 deletions(-)

diff --git a/fs/logfs/dev_bdev.c b/fs/logfs/dev_bdev.c
index 9623812..e2c38f9 100644
--- a/fs/logfs/dev_bdev.c
+++ b/fs/logfs/dev_bdev.c
@@ -72,54 +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;
-			atomic_inc(&super->s_pending_writes);
-			submit_bio(WRITE, 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(WRITE, bio);
+
+			bio = NULL;
+		}
+	}
+
+	if (bio) {
+		atomic_inc(&super->s_pending_writes);
+		submit_bio(WRITE, 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;
-	atomic_inc(&super->s_pending_writes);
-	submit_bio(WRITE, bio);
 	return 0;
 }
 
-- 
1.9.1