From 7dfeaa32204841aade36ba243a1cb45c54f42c15 Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Sat, 4 Jun 2016 14:21:28 -0700
Subject: [PATCH] f2fs: avoid reverse IO order for NODE and DATA
There is a data race between allocate_data_block() and f2fs_sbumit_page_mbio(),
which incur unnecessary reversed bio submission.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
fs/f2fs/f2fs.h | 1 +
fs/f2fs/segment.c | 6 ++++++
fs/f2fs/super.c | 2 ++
3 files changed, 9 insertions(+)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index e21f9df133d11..24c7cde849059 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -766,6 +766,7 @@ struct f2fs_sb_info {
/* for bio operations */
struct f2fs_bio_info read_io; /* for read bios */
struct f2fs_bio_info write_io[NR_PAGE_TYPE]; /* for write bios */
+ struct mutex wio_mutex[NODE + 1]; /* bio ordering for NODE/DATA */
/* for checkpoint */
struct f2fs_checkpoint *ckpt; /* raw checkpoint pointer */
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 9011bffd1dd0a..7b58bfbd84a34 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1399,11 +1399,17 @@ static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio)
{
int type = __get_segment_type(fio->page, fio->type);
+ if (fio->type == NODE || fio->type == DATA)
+ mutex_lock(&fio->sbi->wio_mutex[fio->type]);
+
allocate_data_block(fio->sbi, fio->page, fio->old_blkaddr,
&fio->new_blkaddr, sum, type);
/* writeout dirty page into bdev */
f2fs_submit_page_mbio(fio);
+
+ if (fio->type == NODE || fio->type == DATA)
+ mutex_unlock(&fio->sbi->wio_mutex[fio->type]);
}
void write_meta_page(struct f2fs_sb_info *sbi, struct page *page)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 94bb87dd4b31b..dc66f1623e06a 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1436,6 +1436,8 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
INIT_LIST_HEAD(&sbi->s_list);
mutex_init(&sbi->umount_mutex);
+ mutex_init(&sbi->wio_mutex[NODE]);
+ mutex_init(&sbi->wio_mutex[DATA]);
#ifdef CONFIG_F2FS_FS_ENCRYPTION
memcpy(sbi->key_prefix, F2FS_KEY_DESC_PREFIX,
--
2.30.2