Btrfs: add a device id to device items

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index c46d7eafcf6..8dcf600e39e 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1840,7 +1840,9 @@ static int add_disk(struct btrfs_root *root, char *name, int namelen)
         u16 item_size;
         u64 num_blocks;
         u64 new_blocks;
+        u64 device_id;
         int ret;
+
 printk("adding disk %s\n", name);
         path = btrfs_alloc_path();
         if (!path)
@@ -1875,9 +1877,14 @@ printk("insert failed %d\n", ret);
                                   path->slots[0], struct btrfs_device_item);
         btrfs_set_device_pathlen(dev_item, namelen);
         memcpy(dev_item + 1, name, namelen);
+
+        device_id = btrfs_super_last_device_id(root->fs_info->disk_super) + 1;
+        btrfs_set_super_last_device_id(root->fs_info->disk_super, device_id);
+        btrfs_set_device_id(dev_item, device_id);
         mark_buffer_dirty(path->nodes[0]);
 
-        ret = btrfs_insert_dev_radix(root, bdev, num_blocks, new_blocks);
+        ret = btrfs_insert_dev_radix(root, bdev, device_id, num_blocks,
+                                     new_blocks);
 
         if (!ret) {
                 btrfs_set_super_total_blocks(root->fs_info->disk_super,