add releasepage hooks to block devices which can be used by file systems

Implement blkdev_releasepage() to release the buffer_heads and pages
after we release private data belonging to a mounted filesystem.

Cc: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/super.c b/fs/super.c
index ddba069d7a99..d5fd4498548a 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -800,6 +800,7 @@ int get_sb_bdev(struct file_system_type *fs_type,
                 }
 
                 s->s_flags |= MS_ACTIVE;
+                bdev->bd_super = s;
         }
 
         return simple_set_mnt(mnt, s);
@@ -819,6 +820,7 @@ void kill_block_super(struct super_block *sb)
         struct block_device *bdev = sb->s_bdev;
         fmode_t mode = sb->s_mode;
 
+        bdev->bd_super = 0;
         generic_shutdown_super(sb);
         sync_blockdev(bdev);
         close_bdev_exclusive(bdev, mode);