btrfs: publish per-super attributes in sysfs

This patch adds per-super attributes to sysfs.

It doesn't publish any attributes yet, but does the proper lifetime
handling as well as the basic infrastructure to add new attributes.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 435ef132b800..81f3433fe4fd 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -48,6 +48,7 @@
 #include "rcu-string.h"
 #include "dev-replace.h"
 #include "raid56.h"
+#include "sysfs.h"
 
 #ifdef CONFIG_X86
 #include <asm/cpufeature.h>
@@ -2743,6 +2744,12 @@ retry_root_backup:
 
         btrfs_close_extra_devices(fs_info, fs_devices, 1);
 
+        ret = btrfs_sysfs_add_one(fs_info);
+        if (ret) {
+                pr_err("btrfs: failed to init sysfs interface: %d\n", ret);
+                goto fail_block_groups;
+        }
+
         ret = btrfs_init_space_info(fs_info);
         if (ret) {
                 printk(KERN_ERR "Failed to initial space info: %d\n", ret);
@@ -3584,6 +3591,8 @@ int close_ctree(struct btrfs_root *root)
                        percpu_counter_sum(&fs_info->delalloc_bytes));
         }
 
+        btrfs_sysfs_remove_one(fs_info);
+
         del_fs_roots(fs_info);
 
         btrfs_free_block_groups(fs_info);