Re: [PATCH] sr: Ensure disk is revalidated when media changes

From: Tejun Heo
Date: Fri Apr 08 2011 - 12:21:03 EST


On Fri, Apr 08, 2011 at 12:37:56PM +0100, Stefan Hajnoczi wrote:
> There is a related issue I have been discussing with Amit:
> On media change the inode size is not updated by the sr driver or the
> universal cdrom driver. A userspace process that holds a /dev/sr0
> file descriptor open across media change causes all processes on the
> system to see the old medium size when they do lseek(fd, 0, SEEK_END).
> I think it would make sense to refresh the inode size on media change
> so that even open file descriptors see the new size and a single
> process cannot force a stale value for all other userspace processes
> on the system.

Hmmm... I don't know. Maybe we can but I'm not sure whether there's a
good reason for it. cdrom is locked while opened after all. Are
there actual problems?


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