diff options
| author | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2013-11-18 17:16:17 +0900 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2013-12-23 10:18:01 +0900 |
| commit | 971767caf632190f77a40b4011c19948232eed75 (patch) | |
| tree | 2a3eb454e7924271978932a81b825b1b0136db98 /fs/f2fs/segment.c | |
| parent | 7d5e510944ce60ef0c6c2300a58547679df76db7 (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/segment.c')
| -rw-r--r-- | fs/f2fs/segment.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index d5043bdaa1af..68b8a2bdf6d8 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -869,9 +869,14 @@ static void do_submit_bio(struct f2fs_sb_info *sbi, void f2fs_submit_bio(struct f2fs_sb_info *sbi, enum page_type type, bool sync) { - down_write(&sbi->bio_sem); + enum page_type btype = PAGE_TYPE_OF_BIO(type); + + if (!sbi->bio[btype]) + return; + + mutex_lock(&sbi->write_mutex[btype]); do_submit_bio(sbi, type, sync); - up_write(&sbi->bio_sem); + mutex_unlock(&sbi->write_mutex[btype]); } static void submit_write_page(struct f2fs_sb_info *sbi, struct page *page, @@ -882,7 +887,7 @@ static void submit_write_page(struct f2fs_sb_info *sbi, struct page *page, verify_block_addr(sbi, blk_addr); - down_write(&sbi->bio_sem); + mutex_lock(&sbi->write_mutex[type]); inc_page_count(sbi, F2FS_WRITEBACK); @@ -917,7 +922,7 @@ retry: sbi->last_block_in_bio[type] = blk_addr; - up_write(&sbi->bio_sem); + mutex_unlock(&sbi->write_mutex[type]); trace_f2fs_submit_write_page(page, blk_addr, type); } |