f2fs: implement cgroup writeback support
Cgroup writeback requires explicit support from the filesystem.
f2fs's data and node writeback IOs go through __write_data_page,
which sets fio for submiting IOs. So, we add io_wbc for fio,
associate bios with blkcg by invoking wbc_init_bio() and
account IOs issuing by wbc_account_io().
In addtion, f2fs_fill_super() is updated to set SB_I_CGROUPWB.
Meta writeback IOs is left alone by this patch and will always be
attributed to the root cgroup.
The results show that f2fs can throttle writeback nicely for
data writing and file creating.
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 8b86a48..ec489b2 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2518,6 +2518,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
(test_opt(sbi, POSIX_ACL) ? SB_POSIXACL : 0);
memcpy(&sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
+ sb->s_iflags |= SB_I_CGROUPWB;
/* init f2fs-specific super block info */
sbi->valid_super_block = valid_super_block;