fatfs: add FAT_IOCTL_GET_VOLUME_ID

[~andy/linux] / fs / fat / file.c

diff --git a/fs/fat/file.c b/fs/fat/file.c
index b0b632e50ddb502fca6fe5ac1533df7bae5c33a5..9b104f543056238016c683ef822046a784169f50 100644 (file)
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -114,6 +114,12 @@ out:
        return err;
 }
 
+static int fat_ioctl_get_volume_id(struct inode *inode, u32 __user *user_attr)
+{
+       struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+       return put_user(sbi->vol_id, user_attr);
+}
+
 long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
        struct inode *inode = file_inode(filp);
@@ -124,6 +130,8 @@ long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
                return fat_ioctl_get_attributes(inode, user_attr);
        case FAT_IOCTL_SET_ATTRIBUTES:
                return fat_ioctl_set_attributes(filp, user_attr);
+       case FAT_IOCTL_GET_VOLUME_ID:
+               return fat_ioctl_get_volume_id(inode, user_attr);
        default:
                return -ENOTTY; /* Inappropriate ioctl for device */
        }