btrfs: dev add should add its sysfs entry

we would need the device links to be created,
when device is added.

Signed-off-by: Anand Jain <Anand.Jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>

3 files changed, 16 insertions, 3 deletions

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 401677b11045..78699364f537 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -625,14 +625,17 @@ int btrfs_kobj_rm_device(struct btrfs_fs_info *fs_info,
         return 0;
 }
 
-static int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info)
+int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info,
+                struct btrfs_device *one_device)
 {
         int error = 0;
         struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
         struct btrfs_device *dev;
 
-        fs_info->device_dir_kobj = kobject_create_and_add("devices",
+        if (!fs_info->device_dir_kobj)
+                fs_info->device_dir_kobj = kobject_create_and_add("devices",
                                                 &fs_info->super_kobj);
+
         if (!fs_info->device_dir_kobj)
                 return -ENOMEM;
 
@@ -643,6 +646,9 @@ static int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info)
                 if (!dev->bdev)
                         continue;
 
+                if (one_device && one_device != dev)
+                        continue;
+
                 disk = dev->bdev->bd_part;
                 disk_kobj = &part_to_dev(disk)->kobj;
 
@@ -686,7 +692,7 @@ int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
         if (error)
                 goto failure;
 
-        error = btrfs_kobj_add_device(fs_info);
+        error = btrfs_kobj_add_device(fs_info, NULL);
         if (error)
                 goto failure;
 
diff --git a/fs/btrfs/sysfs.h b/fs/btrfs/sysfs.h
index 529554e5f9de..ac46df37504c 100644
--- a/fs/btrfs/sysfs.h
+++ b/fs/btrfs/sysfs.h
@@ -66,6 +66,8 @@ char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags);
 extern const char * const btrfs_feature_set_names[3];
 extern struct kobj_type space_info_ktype;
 extern struct kobj_type btrfs_raid_ktype;
+int btrfs_kobj_add_device(struct btrfs_fs_info *fs_info,
+                struct btrfs_device *one_device);
 int btrfs_kobj_rm_device(struct btrfs_fs_info *fs_info,
                 struct btrfs_device *one_device);
 #endif /* _BTRFS_SYSFS_H_ */
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index be2c8e285afb..19b67e969b52 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2147,6 +2147,10 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
         total_bytes = btrfs_super_num_devices(root->fs_info->super_copy);
         btrfs_set_super_num_devices(root->fs_info->super_copy,
                                     total_bytes + 1);
+
+        /* add sysfs device entry */
+        btrfs_kobj_add_device(root->fs_info, device);
+
         mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
 
         if (seeding_dev) {
@@ -2209,6 +2213,7 @@ error_trans:
         unlock_chunks(root);
         btrfs_end_transaction(trans, root);
         rcu_string_free(device->name);
+        btrfs_kobj_rm_device(root->fs_info, device);
         kfree(device);
 error:
         blkdev_put(bdev, FMODE_EXCL);