btrfs: btrfs_init_new_device should use fs_info->dev_root

btrfs_init_new_device only uses the root passed in via the ioctl to
start the transaction.  Nothing else that happens is related to whatever
root the user used to initiate the ioctl.  We can drop the root requirement
and just use fs_info->dev_root instead.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

3 files changed, 4 insertions, 3 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 67c37fdd00dc..5b21a9bcfe81 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2672,7 +2672,7 @@ static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
         }
 
         vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
-        ret = btrfs_init_new_device(root, vol_args->name);
+        ret = btrfs_init_new_device(root->fs_info, vol_args->name);
 
         if (!ret)
                 btrfs_info(root->fs_info, "disk added %s",vol_args->name);
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 99a81369e43d..1622dc7eab91 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2310,8 +2310,9 @@ error:
         return ret;
 }
 
-int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
+int btrfs_init_new_device(struct btrfs_fs_info *fs_info, char *device_path)
 {
+        struct btrfs_root *root = fs_info->dev_root;
         struct request_queue *q;
         struct btrfs_trans_handle *trans;
         struct btrfs_device *device;
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 471a619787e8..0c8e77bfa8f6 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -439,7 +439,7 @@ int btrfs_grow_device(struct btrfs_trans_handle *trans,
 struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
                                        u8 *uuid, u8 *fsid);
 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
-int btrfs_init_new_device(struct btrfs_root *root, char *path);
+int btrfs_init_new_device(struct btrfs_fs_info *fs_info, char *path);
 int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
                                   struct btrfs_device *srcdev,
                                   struct btrfs_device **device_out);