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authorJaegeuk Kim <jaegeuk.kim@samsung.com>2013-11-18 17:16:17 +0900
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2013-12-23 10:18:01 +0900
commit971767caf632190f77a40b4011c19948232eed75 (patch)
tree2a3eb454e7924271978932a81b825b1b0136db98 /fs/f2fs/super.c
parent7d5e510944ce60ef0c6c2300a58547679df76db7 (diff)
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>
Diffstat (limited to 'fs/f2fs/super.c')
-rw-r--r--fs/f2fs/super.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index a022412c66ea..e194578b3594 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -820,6 +820,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
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 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
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);