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Date:	Fri, 25 Jul 2014 15:47:23 -0700
From:	Jaegeuk Kim <>
Cc:	Jaegeuk Kim <>
Subject: [PATCH 09/11] f2fs: test before set/clear bits

If the bit is already set, we don't need to reset it, and vice versa.
Because we don't need to make the caches dirty for that.

Signed-off-by: Jaegeuk Kim <>
 fs/f2fs/f2fs.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 8f8685e..475f97c 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1003,7 +1003,8 @@ enum {
 static inline void set_inode_flag(struct f2fs_inode_info *fi, int flag)
-	set_bit(flag, &fi->flags);
+	if (!test_bit(flag, &fi->flags))
+		set_bit(flag, &fi->flags);
 static inline int is_inode_flag_set(struct f2fs_inode_info *fi, int flag)
@@ -1013,7 +1014,8 @@ static inline int is_inode_flag_set(struct f2fs_inode_info *fi, int flag)
 static inline void clear_inode_flag(struct f2fs_inode_info *fi, int flag)
-	clear_bit(flag, &fi->flags);
+	if (test_bit(flag, &fi->flags))
+		clear_bit(flag, &fi->flags);
 static inline void set_acl_inode(struct f2fs_inode_info *fi, umode_t mode)
-- (Apple Git-48)

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