From: Chao Yu <chao2.yu@samsung.com>
Date: Mon, 8 Jun 2015 05:28:03 +0000 (+0800)
Subject: f2fs: skip committing valid superblock
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c5bda1c8b13ad7840ae0e8c9a2926df686ba6e06;p=linux-beck.git

f2fs: skip committing valid superblock

In recovery procedure for superblock, we try to write data of valid
superblock into invalid one for recovery, work should be finished here,
but then still we will write the valid one with its original data.
This operation is not needed. Let's skip doing this unnecessary work.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 1a0716c36940..a8327ed73898 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1624,7 +1624,7 @@ static inline int f2fs_add_link(struct dentry *dentry, struct inode *inode)
 /*
  * super.c
  */
-int f2fs_commit_super(struct f2fs_sb_info *);
+int f2fs_commit_super(struct f2fs_sb_info *, bool);
 int f2fs_sync_fs(struct super_block *, int);
 extern __printf(3, 4)
 void f2fs_msg(struct super_block *, const char *, const char *, ...);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 4d42d66acd96..096e08ca3945 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1530,7 +1530,7 @@ static int f2fs_ioc_get_encryption_pwsalt(struct file *filp, unsigned long arg)
 	/* update superblock with uuid */
 	generate_random_uuid(sbi->raw_super->encrypt_pw_salt);
 
-	err = f2fs_commit_super(sbi);
+	err = f2fs_commit_super(sbi, false);
 
 	mnt_drop_write_file(filp);
 	if (err) {
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index d54c54f6a49d..a06b0b46fe69 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1043,7 +1043,7 @@ out:
 	return 0;
 }
 
-int f2fs_commit_super(struct f2fs_sb_info *sbi)
+int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
 {
 	struct buffer_head *sbh = sbi->raw_super_buf;
 	sector_t block = sbh->b_blocknr;
@@ -1055,7 +1055,9 @@ int f2fs_commit_super(struct f2fs_sb_info *sbi)
 	err = sync_dirty_buffer(sbh);
 
 	sbh->b_blocknr = block;
-	if (err)
+
+	/* if we are in recovery path, skip writing valid superblock */
+	if (recover || err)
 		goto out;
 
 	/* write current valid superblock */
@@ -1289,7 +1291,7 @@ try_onemore:
 	/* recover broken superblock */
 	if (recovery && !f2fs_readonly(sb) && !bdev_read_only(sb->s_bdev)) {
 		f2fs_msg(sb, KERN_INFO, "Recover invalid superblock");
-		f2fs_commit_super(sbi);
+		f2fs_commit_super(sbi, true);
 	}
 
 	return 0;