BFS: clean up the superblock usage

BFS is a very simple FS and its superblocks contains only static
information and is never changed. However, the BFS code for some
misterious reasons marked its buffer head as dirty from time to
time, but nothing in that buffer was ever changed.

This patch removes all the BFS superblock manipulation, simply
because it is not needed. It removes:

1. The si_sbh filed from 'struct bfs_sb_info' because it is not
   needed. We only need to read the SB once on mount to get the
   start of data blocks and the FS size. After this, we can forget
   about the SB.
2. All instances of 'mark_buffer_dirty(sbh)' for BFS SB because
   it is never changed.
3. The '->sync_fs()' method because there is nothing to sync
   (inodes are synched by VFS).
4. The '->write_super()' method, again, because the SB is never
   changed.

Tested-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 0 insertions, 3 deletions

diff --git a/fs/bfs/file.c b/fs/bfs/file.c
index 8fc2e9c9739..eb67edd0f8e 100644
--- a/fs/bfs/file.c
+++ b/fs/bfs/file.c
@@ -70,7 +70,6 @@ static int bfs_get_block(struct inode *inode, sector_t block,
 	struct super_block *sb = inode->i_sb;
 	struct bfs_sb_info *info = BFS_SB(sb);
 	struct bfs_inode_info *bi = BFS_I(inode);
-	struct buffer_head *sbh = info->si_sbh;
 
 	phys = bi->i_sblock + block;
 	if (!create) {
@@ -112,7 +111,6 @@ static int bfs_get_block(struct inode *inode, sector_t block,
 		info->si_freeb -= phys - bi->i_eblock;
 		info->si_lf_eblk = bi->i_eblock = phys;
 		mark_inode_dirty(inode);
-		mark_buffer_dirty(sbh);
 		err = 0;
 		goto out;
 	}
@@ -147,7 +145,6 @@ static int bfs_get_block(struct inode *inode, sector_t block,
 	 */
 	info->si_freeb -= bi->i_eblock - bi->i_sblock + 1 - inode->i_blocks;
 	mark_inode_dirty(inode);
-	mark_buffer_dirty(sbh);
 	map_bh(bh_result, sb, phys);
 out:
 	mutex_unlock(&info->bfs_lock);