fs: remove mapping->backing_dev_info
Now that we never use the backing_dev_info pointer in struct address_space
we can simply remove it and save 4 to 8 bytes in every inode.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Reviewed-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/drivers/char/raw.c b/drivers/char/raw.c
index a24891b..6e29bf2 100644
--- a/drivers/char/raw.c
+++ b/drivers/char/raw.c
@@ -104,11 +104,9 @@
mutex_lock(&raw_mutex);
bdev = raw_devices[minor].binding;
- if (--raw_devices[minor].inuse == 0) {
+ if (--raw_devices[minor].inuse == 0)
/* Here inode->i_mapping == bdev->bd_inode->i_mapping */
inode->i_mapping = &inode->i_data;
- inode->i_mapping->backing_dev_info = &default_backing_dev_info;
- }
mutex_unlock(&raw_mutex);
blkdev_put(bdev, filp->f_mode | FMODE_EXCL);