From 3adc5fcb7edf5f8dfe8d37dcb50ba6b30077c905 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Tue, 2 May 2017 17:03:47 +0200 Subject: f2fs: Make flush bios explicitely sync Commit b685d3d65ac7 "block: treat REQ_FUA and REQ_PREFLUSH as synchronous" removed REQ_SYNC flag from WRITE_{FUA|PREFLUSH|...} definitions. generic_make_request_checks() however strips REQ_FUA and REQ_PREFLUSH flags from a bio when the storage doesn't report volatile write cache and thus write effectively becomes asynchronous which can lead to performance regressions. Fix the problem by making sure all bios which are synchronous are properly marked with REQ_SYNC. Fixes: b685d3d65ac791406e0dfd8779cc9b3707fea5a3 Cc: stable@vger.kernel.org # 4.9+ CC: Jaegeuk Kim CC: linux-f2fs-devel@lists.sourceforge.net Signed-off-by: Jan Kara Acked-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/data.c | 2 +- fs/f2fs/segment.c | 2 +- fs/f2fs/super.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) (limited to 'fs') diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 1254986dd6eb..7c0f6bdf817d 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -309,7 +309,7 @@ static void __f2fs_submit_merged_bio(struct f2fs_sb_info *sbi, if (type >= META_FLUSH) { io->fio.type = META_FLUSH; io->fio.op = REQ_OP_WRITE; - io->fio.op_flags = REQ_META | REQ_PRIO; + io->fio.op_flags = REQ_META | REQ_PRIO | REQ_SYNC; if (!test_opt(sbi, NOBARRIER)) io->fio.op_flags |= REQ_PREFLUSH | REQ_FUA; } diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 6e1c8cf75749..de31030b5041 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -446,7 +446,7 @@ static int __submit_flush_wait(struct f2fs_sb_info *sbi, struct bio *bio = f2fs_bio_alloc(0); int ret; - bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; + bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH; bio->bi_bdev = bdev; ret = submit_bio_wait(bio); bio_put(bio); diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 9a14b2590337..83355ec4a92c 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1325,7 +1325,7 @@ static int __f2fs_commit_super(struct buffer_head *bh, unlock_buffer(bh); /* it's rare case, we can do fua all the time */ - return __sync_dirty_buffer(bh, REQ_PREFLUSH | REQ_FUA); + return __sync_dirty_buffer(bh, REQ_SYNC | REQ_PREFLUSH | REQ_FUA); } static inline bool sanity_check_area_boundary(struct f2fs_sb_info *sbi, -- cgit v1.2.3