mm: bdi init hooks

provide BDI constructor/destructor hooks

[akpm@linux-foundation.org: compile fix]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 19 insertions, 0 deletions

diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h
index 3b0185fdf9a4..cca98609aa7f 100644
--- a/fs/configfs/configfs_internal.h
+++ b/fs/configfs/configfs_internal.h
@@ -56,6 +56,8 @@ extern int configfs_is_root(struct config_item *item);
 
 extern struct inode * configfs_new_inode(mode_t mode, struct configfs_dirent *);
 extern int configfs_create(struct dentry *, int mode, int (*init)(struct inode *));
+extern int configfs_inode_init(void);
+extern void configfs_inode_exit(void);
 
 extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
 extern int configfs_make_dirent(struct configfs_dirent *,
diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c
index dbd257d956c4..4c1ebff778ee 100644
--- a/fs/configfs/inode.c
+++ b/fs/configfs/inode.c
@@ -256,4 +256,12 @@ void configfs_hash_and_remove(struct dentry * dir, const char * name)
         mutex_unlock(&dir->d_inode->i_mutex);
 }
 
+int __init configfs_inode_init(void)
+{
+        return bdi_init(&configfs_backing_dev_info);
+}
 
+void __exit configfs_inode_exit(void)
+{
+        bdi_destroy(&configfs_backing_dev_info);
+}
diff --git a/fs/configfs/mount.c b/fs/configfs/mount.c
index 871b0cb61839..3bf0278ea843 100644
--- a/fs/configfs/mount.c
+++ b/fs/configfs/mount.c
@@ -154,8 +154,16 @@ static int __init configfs_init(void)
                 subsystem_unregister(&config_subsys);
                 kmem_cache_destroy(configfs_dir_cachep);
                 configfs_dir_cachep = NULL;
+                goto out;
         }
 
+        err = configfs_inode_init();
+        if (err) {
+                unregister_filesystem(&configfs_fs_type);
+                subsystem_unregister(&config_subsys);
+                kmem_cache_destroy(configfs_dir_cachep);
+                configfs_dir_cachep = NULL;
+        }
 out:
         return err;
 }
@@ -166,6 +174,7 @@ static void __exit configfs_exit(void)
         subsystem_unregister(&config_subsys);
         kmem_cache_destroy(configfs_dir_cachep);
         configfs_dir_cachep = NULL;
+        configfs_inode_exit();
 }
 
 MODULE_AUTHOR("Oracle");