On Fri, 2007-07-27 at 13:07 -0500, [EMAIL PROTECTED] wrote:
> Hello,
>
> In a block device driver, how do you tell the kernel that your block device
> is read-only? Is it in the registration of the gendisk, or is there an
> ioctl I should be catching to inform the kernel (and user) that this disk
> is read-only?
Unless I misunderstand the question, the "write" and "writev" function
of the "struct file_operations" should return an appropriate error value
(which is here -EACCES).
You may think of returning an error in the "open" if someone wants to
open it to write to it (so that the must open it read-only).
But I don't know if that is common practice or not (or even disliked) as
it may interfere with not properly implemented tools which open devices
read-write even if they never write to it.
Bernd
--
Firmix Software GmbH http://www.firmix.at/
mobil: +43 664 4416156 fax: +43 1 7890849-55
Embedded Linux Development and Services
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
