ntfs3: add FS_IOC_SETFSLABEL ioctl

Add support for the FS_IOC_SETFSLABEL ioctl.

Signed-off-by: Ethan Ferguson <[email protected]>
Signed-off-by: Konstantin Komarov <[email protected]>

Author: ethan-ferguson-zetier

fs/ntfs3/file.c

@@ -57,6 +57,22 @@ static int ntfs_ioctl_get_volume_label(struct ntfs_sb_info *sbi, u8 __user *buf)
 	return 0;
 }
 
+static int ntfs_ioctl_set_volume_label(struct ntfs_sb_info *sbi, u8 __user *buf)
+{
+	u8 user[FSLABEL_MAX] = {0};
+	int len;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	if (copy_from_user(user, buf, FSLABEL_MAX))
+		return -EFAULT;
+
+	len = strnlen(user, FSLABEL_MAX);
+
+	return ntfs_set_label(sbi, user, len);
+}
+
 /*
  * ntfs_ioctl - file_operations::unlocked_ioctl
  */
@@ -74,6 +90,8 @@ long ntfs_ioctl(struct file *filp, u32 cmd, unsigned long arg)
 		return ntfs_ioctl_fitrim(sbi, arg);
 	case FS_IOC_GETFSLABEL:
 		return ntfs_ioctl_get_volume_label(sbi, (u8 __user *)arg);
+	case FS_IOC_SETFSLABEL:
+		return ntfs_ioctl_set_volume_label(sbi, (u8 __user *)arg);
 	}
 	return -ENOTTY; /* Inappropriate ioctl for device. */
 }