linux-kernel - [PATCH v2] f2fs: restrict write IO alignment condition

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Date:   Mon, 13 Mar 2017 21:02:16 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <chao@...nel.org>,
        Chao Yu <yuchao0@...wei.com>
Subject: [PATCH v2] f2fs: restrict write IO alignment condition

We should only align start offset of bio with defined IO_SIZE for below
conditions:
a. mode=lfs mount option
b. write IOs
c. Out-place-update
d. non-meta pages

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 fs/f2fs/data.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 1375fef11146..53fe79c70406 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -190,6 +190,9 @@ static inline void __submit_bio(struct f2fs_sb_info *sbi,
 			current->plug && (type == DATA || type == NODE))
 			blk_finish_plug(current->plug);
 
+		if (!test_opt(sbi, LFS))
+			goto submit_io;
+
 		if (type != DATA && type != NODE)
 			goto submit_io;
 
@@ -395,11 +398,12 @@ int f2fs_submit_page_mbio(struct f2fs_io_info *fio)
 		__submit_merged_bio(io);
 alloc_new:
 	if (io->bio == NULL) {
-		if ((fio->type == DATA || fio->type == NODE) &&
+		if (test_opt(sbi, LFS) &&
+			!is_read && (fio->type == DATA || fio->type == NODE) &&
 				fio->new_blkaddr & F2FS_IO_SIZE_MASK(sbi)) {
 			err = -EAGAIN;
-			if (!is_read)
-				dec_page_count(sbi, WB_DATA_TYPE(bio_page));
+			f2fs_bug_on(sbi, fio->new_blkaddr == fio->old_blkaddr);
+			dec_page_count(sbi, WB_DATA_TYPE(bio_page));
 			goto out_fail;
 		}
 		io->bio = __bio_alloc(sbi, fio->new_blkaddr,
-- 
2.8.2.295.g3f1c1d0