f2fs: use sbi->write_mutex for write bios
This patch removes an unnecessary semaphore (i.e., sbi->bio_sem).
There is no reason to use the semaphore when f2fs submits read and write IOs.
Instead, let's use a write mutex and cover the sbi->bio[] by the lock.
Change log from v1:
o split write_mutex suggested by Chao Yu
Chao described,
"All DATA/NODE/META bio buffers in superblock is protected by
'sbi->write_mutex', but each bio buffer area is independent, So we
should split write_mutex to three for DATA/NODE/META."
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index a022412..e194578 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -820,6 +820,7 @@
struct buffer_head *raw_super_buf;
struct inode *root;
long err = -EINVAL;
+ int i;
/* allocate memory for f2fs-specific super block info */
sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
@@ -876,7 +877,10 @@
mutex_init(&sbi->node_write);
sbi->por_doing = false;
spin_lock_init(&sbi->stat_lock);
- init_rwsem(&sbi->bio_sem);
+
+ for (i = 0; i < NR_PAGE_TYPE; i++)
+ mutex_init(&sbi->write_mutex[i]);
+
init_rwsem(&sbi->cp_rwsem);
init_waitqueue_head(&sbi->cp_wait);
init_sb_info(sbi);