Btrfs: Add new ioctl to add devices

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

1 files changed, 23 insertions, 0 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index ab707c0930df..1a74b5018699 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3070,6 +3070,27 @@ static int btrfs_ioctl_defrag(struct file *file)
         return 0;
 }
 
+long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
+{
+        struct btrfs_ioctl_vol_args *vol_args;
+        int ret;
+
+        vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
+
+        if (!vol_args)
+                return -ENOMEM;
+
+        if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
+                ret = -EFAULT;
+                goto out;
+        }
+        ret = btrfs_init_new_device(root, vol_args->name);
+
+out:
+        kfree(vol_args);
+        return ret;
+}
+
 long btrfs_ioctl(struct file *file, unsigned int
                 cmd, unsigned long arg)
 {
@@ -3082,6 +3103,8 @@ long btrfs_ioctl(struct file *file, unsigned int
                 return btrfs_ioctl_defrag(file);
         case BTRFS_IOC_RESIZE:
                 return btrfs_ioctl_resize(root, (void __user *)arg);
+        case BTRFS_IOC_ADD_DEV:
+                return btrfs_ioctl_add_dev(root, (void __user *)arg);
         }
 
         return -ENOTTY;