static long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
long ret;
struct inode *inode = file_inode(file);
switch (cmd) {
case FS_IOC_GETFLAGS:
ret = ovl_real_ioctl(file, cmd, arg);
break;
case FS_IOC_SETFLAGS:
if (!inode_owner_or_capable(inode))
return -EACCES;
ret = mnt_want_write_file(file);
if (ret)
return ret;
ret = ovl_copy_up_with_data(file_dentry(file));
if (!ret) {
ret = ovl_real_ioctl(file, cmd, arg);
inode_lock(inode);
ovl_copyflags(ovl_inode_real(inode), inode);
inode_unlock(inode);
}
mnt_drop_write_file(file);
break;
default:
ret = -ENOTTY;
}
return ret;
}
static long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
long ret;
switch (cmd) {
case FS_IOC_GETFLAGS:
ret = ovl_real_ioctl(file, cmd, arg);
break;
case FS_IOC_SETFLAGS:
ret = ovl_ioctl_set_flags(file, arg);
break;
default:
ret = -ENOTTY;
}
return ret;
}
static long ovl_ioctl_set_flags(struct file *file, unsigned long arg)
{
long ret;
struct inode *inode = file_inode(file);
unsigned int flags;
unsigned int old_flags;
if (!inode_owner_or_capable(inode))
return -EACCES;
if (get_user(flags, (int __user *) arg))
return -EFAULT;
ret = mnt_want_write_file(file);
if (ret)
return ret;
inode_lock(inode);
/* Check the capability before cred override */
ret = -EPERM;
old_flags = ovl_get_inode_flags(inode);
if (((flags ^ old_flags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) &&
!capable(CAP_LINUX_IMMUTABLE))
goto unlock;
ret = ovl_maybe_copy_up(file_dentry(file), O_WRONLY);
if (ret)
goto unlock;
ret = ovl_real_ioctl(file, FS_IOC_SETFLAGS, arg);
ovl_copyflags(ovl_inode_real(inode), inode);
unlock:
inode_unlock(inode);
mnt_drop_write_file(file);
return ret;
}
