Re: [patch 1/1] PM: Adds remount fs ro at suspend

[Pavel Machek <pavel@ucw.cz>]

Hi!

> > Why do you think remounting filesystems is necessary? Are you getting
> > problems with some particular filesystem?
> 
> No.  But anything in a removable device neets to be either remounted
> read-only or unmounted if that is at all possible, because the user could
> unplug it.  It is of course, sync'd anyway, so if the remount/umount fails,
> no corruption should happen...  but the fs will be dirty, etc.
> 
> It can get very ugly when you factor in docks and removable bays. It's not
> just USB/firewire mass-storage devices and memory cards.  And there is the
> patological cases where the user suspends with the device in one port, and
> resumes with the device in another port.
> 
> I feel userspace *can* do all that needs to be done, but we are (currently)
> very bad at it.

Fix it in userspace, then. fsck when you unplug disk while suspended
should serve as a reminder to fix that userspace :-).

(And yes, you may need some kernel support to do it nicely; hopefully
same kernel support that will solve users unplugging disks without
umount.)
									Pavel
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