[PATCH 2/3] f2fs: refactor f2fs_commit_super

[Jaegeuk Kim]

Previously, f2fs_commit_super hacks the bh->blocknr to write the broken
alternate superblock.
Instead of it, we should use the correct logic to retrieve its buffer head
with locking it appropriately.

Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
 fs/f2fs/super.c | 32 ++++++++++++++++++++------------
 1 file changed, 20 insertions(+), 12 deletions(-)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index bd7e9c6..dbf16ad 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1099,27 +1099,35 @@ out:
 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;
+	struct buffer_head *bh;
 	int err;
 
 	/* write back-up superblock first */
-	sbh->b_blocknr = block ? 0 : 1;
-	mark_buffer_dirty(sbh);
-	err = sync_dirty_buffer(sbh);
+	bh = sb_getblk(sbi->sb, sbh->b_blocknr ? 0 : 1);
+	if (!bh)
+		return -EIO;
 
-	sbh->b_blocknr = block;
+	lock_buffer(bh);
+	memcpy(bh->b_data, sbh->b_data, sbh->b_size);
+	WARN_ON(sbh->b_size != F2FS_BLKSIZE);
+	set_buffer_uptodate(bh);
+	set_buffer_dirty(bh);
+	unlock_buffer(bh);
+
+	/* it's rare case, we can do fua all the time */
+	err = __sync_dirty_buffer(bh, WRITE_FLUSH_FUA);
+	brelse(bh);
 
 	/* if we are in recovery path, skip writing valid superblock */
 	if (recover || err)
-		goto out;
+		return err;
 
 	/* 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;
+	lock_buffer(sbh);
+	set_buffer_dirty(sbh);
+	unlock_buffer(sbh);
+
+	return __sync_dirty_buffer(sbh, WRITE_FLUSH_FUA);
 }
 
 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
-- 
2.4.9 (Apple Git-60)

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