On Thursday 06 January 2011, Shaohua Li wrote: > I don't understand. adding a case statement in compat_sys_ioctl, so we will do > compat_ioctl_check_table(). If I add COMPATIBLE_IOCTL(), then the check > will success, we will go to the found_handler code path and execute > do_vfs_ioctl, which is what we want. if not adding COMPATIBLE_IOCTL(), > the check will fail, and in any case, we will go to the out_fput code > path, so our ioctl does nothing. You are correct, I misremembered the code and did not check properly. > > Two more general comments: > > > > - You probably want to add the ioctls to file_ioctl instead of do_vfs_ioctl, > > so you don't add another case statement to the common path. > > > > - I don't know if there are any rules for what should be an ioctl or an > > fcntl, we're rather inconsistent about this. If you have found a good > > reason for making it an ioctl, just put that into the changelog so we > > can refer to it next time. > it can be applied to a directory too. I thought file_ioctl or fcntl is > for file. Right again, good point! Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
