Re: [Qemu-devel] [REPOST] [PATCH 0/2] IDE error checking

[Anthony Liguori <anthony@codemonkey.ws>]

Ian Jackson wrote:
> In these two patches I make the IDE controller emulation pay attention
> to errors returned by the bdrv functions.
>
> The first of these patches was first posted in February 2008 and has
> been discussed extensively.
>
> There was some discussion as to whether it would be better, in cases
> where the error was ENOSPC, to stop the guest than to pass it an IDE
> error.  However it must be clear that regardless of whether that would
> be better in some circumstances, giving the guest an IDE error is
> better than silently ignoring the error, throwing away the guest's
> data.
>   

The proper solution is not significantly more difficult.  Just add a 
switch(errno) { case ENOSPC: vm_stop(0); term_printf("Ran out of disk 
space\n"); break; }.  That's all I'm asking for.

Regards,

Anthony Liguori

> I would therefore submit that my patch should be applied immediately.
> If anyone wants to implement automatic stopping of guests on ENOSPC
> errors this should then be done as an optional enhancement.
>
> In this patch pair I don't fix the call to bdrv_flush in FLUSH CACHE.
> This is because that's entangled with another dropped series of
> patches to implement use of aio for cache flushing and guest control
> of the host write cache.
>
> Ian.
>
>
>