linux-kernel - [PATCH -v2] f2fs: Remove lock from check_valid

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Message-Id: <1410061110-31081-1-git-send-email-ying.huang@intel.com>
Date:	Sun,  7 Sep 2014 11:38:30 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Jaegeuk Kim <jaegeuk@...nel.org>,
	Changman Lee <cm224.lee@...sung.com>
Cc:	linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, Huang Ying <ying.huang@...el.com>
Subject: [PATCH -v2] f2fs: Remove lock from check_valid_map

Only one bit is read in check_valid_map, holding a lock to do that
doesn't help anything except decreasing performance.

Signed-off-by: Huang, Ying <ying.huang@...el.com>
---

v2: Fixed a build warning.

---
 fs/f2fs/gc.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -378,14 +378,11 @@ static void put_gc_inode(struct list_hea
 static int check_valid_map(struct f2fs_sb_info *sbi,
 				unsigned int segno, int offset)
 {
-	struct sit_info *sit_i = SIT_I(sbi);
 	struct seg_entry *sentry;
 	int ret;
 
-	mutex_lock(&sit_i->sentry_lock);
 	sentry = get_seg_entry(sbi, segno);
 	ret = f2fs_test_bit(offset, sentry->cur_valid_map);
-	mutex_unlock(&sit_i->sentry_lock);
 	return ret;
 }
 
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