f2fs: introduce f2fs_commit_super

This patch introduces f2fs_commit_super to write updated superblock.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index c98454d011ff1cfe8db90f9a3203f85d05043996..7ff3ac7a1ce81e434898d44dfd854cd4dc22f37d 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1535,6 +1535,7 @@ static inline int f2fs_add_link(struct dentry *dentry, struct inode *inode)
 /*
  * super.c
  */
+int f2fs_commit_super(struct f2fs_sb_info *);
 int f2fs_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/super.c b/fs/f2fs/super.c
index b2dd1b01f07634e27f42fc09e8fd627a70395e3e..85841687b40a7dcdf01b1aad1b1e436840443a23 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -966,6 +966,30 @@ retry:
        return 0;
 }
 
+int f2fs_commit_super(struct f2fs_sb_info *sbi)
+{
+       struct buffer_head *sbh = sbi->raw_super_buf;
+       sector_t block = sbh->b_blocknr;
+       int err;
+
+       /* write back-up superblock first */
+       sbh->b_blocknr = block ? 0 : 1;
+       mark_buffer_dirty(sbh);
+       err = sync_dirty_buffer(sbh);
+
+       sbh->b_blocknr = block;
+       if (err)
+               goto out;
+
+       /* write current valid superblock */
+       mark_buffer_dirty(sbh);
+       err = sync_dirty_buffer(sbh);
+out:
+       clear_buffer_write_io_error(sbh);
+       set_buffer_uptodate(sbh);
+       return err;
+}
+
 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 {
        struct f2fs_sb_info *sbi;