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Commit 5d909cdb authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: refactor f2fs_commit_super 



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.

Reviewed-by: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 80609448

fs/f2fs/super.c

+20 −12
Original line number Diff line number Diff line
@@ -1099,27 +1099,35 @@ static int read_raw_super_block(struct super_block *sb, 
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)