On Sun, Nov 22, 2009 at 12:32:16PM +, Ben Hutchings wrote:
> On Sun, 2009-11-22 at 12:42 +0100, Wouter van Heyst wrote:
...
> > I'm running 2.6.32-rc7 with this patch applied and
> > CONFIG_MMC_UNSAFE_RESUME=y
> > That works as desired for my non-removable case. Is it desired that I
> > test
On Mon, 2009-11-30 at 13:51 +, Alan Cox wrote:
> > Before we do suspend, pick few random sectors from the media, run that
> > through some hash function, thus creating some sort of watermark.
>
> Statistically speaking the chances are you'll catch zero sectors and
> lose. You'll also not dete
> Before we do suspend, pick few random sectors from the media, run that
> through some hash function, thus creating some sort of watermark.
Statistically speaking the chances are you'll catch zero sectors and
lose. You'll also not detect the suspend, move to other box, use, put
back error. That i
On Mon, 2009-11-30 at 13:39 +0100, Pierre Ossman wrote:
> On Tue, 17 Nov 2009 08:53:00 +0100
> Stefan Richter wrote:
>
> > Ben Hutchings wrote:
> > > In general, it is not possible to tell whether a card present in an MMC
> > > slot after resume is the same that was there before suspend.
> >
>
On Mon, 30 Nov 2009 12:54:05 +
Alan Cox wrote:
>
> For most file systems it is sufficient to check the superblock related
> information. So we'd need an fs->ops->validate_media() or somesuch but it
> wouldn't be that horrific or need to do much I/O in most cases.
>
> You could defeat that b
> You do not cater for having more than one slot e.g. N900 has two:
> one internal non-removable and one external that is removable.
>
> What about a sysfs entry instead e.g.
>
> /sys/class/mmc-host/mmc*/nonremovable
That continues the assumption that the user will somehow ever know about
this
Ben Hutchings wrote:
Some people run general-purpose distribution kernels on netbooks with
a card that is physically non-removable or logically non-removable
(e.g. used for /home) and cannot be cleanly unmounted during suspend.
Add a module parameter to set whether cards are assumed removable or
> I'm afraid that's insufficient. What it would need to do is to is
> flush everything (to make sure what's on disk matches what's in
> memory), but also read back the filesystem on resume to verify that
> nothing else modified it (i.e. making sure what's on disk still matches
> what's in memory).
On Tue, 17 Nov 2009 08:53:00 +0100
Stefan Richter wrote:
> Ben Hutchings wrote:
> > In general, it is not possible to tell whether a card present in an MMC
> > slot after resume is the same that was there before suspend.
>
> That's true for virtually all storage devices, not just MMC.
>
> > So
On Sun, 2009-11-22 at 12:42 +0100, Wouter van Heyst wrote:
> On Mon, Nov 16, 2009 at 10:31:49PM +, Ben Hutchings wrote:
[...]
> > In general, it is not possible to tell whether a card present in an MMC
> > slot after resume is the same that was there before suspend. So there
> > are two possib
On Mon, Nov 16, 2009 at 10:31:49PM +, Ben Hutchings wrote:
> On Mon, 2009-11-16 at 12:23 -0800, Andrew Morton wrote:
> > On Wed, 11 Nov 2009 04:44:36 +
> > Ben Hutchings wrote:
> >
> > > Some people run general-purpose distribution kernels on netbooks with
> > > a card that is physically
Ben Hutchings wrote:
> In general, it is not possible to tell whether a card present in an MMC
> slot after resume is the same that was there before suspend.
That's true for virtually all storage devices, not just MMC.
> So there are two possible behaviours, each of which will cause data
> loss i
On Mon, 2009-11-16 at 12:23 -0800, Andrew Morton wrote:
> On Wed, 11 Nov 2009 04:44:36 +
> Ben Hutchings wrote:
>
> > Some people run general-purpose distribution kernels on netbooks with
> > a card that is physically non-removable or logically non-removable
> > (e.g. used for /home) and cann
On Wed, 11 Nov 2009 04:44:36 +
Ben Hutchings wrote:
> Some people run general-purpose distribution kernels on netbooks with
> a card that is physically non-removable or logically non-removable
> (e.g. used for /home) and cannot be cleanly unmounted during suspend.
> Add a module parameter to
Some people run general-purpose distribution kernels on netbooks with
a card that is physically non-removable or logically non-removable
(e.g. used for /home) and cannot be cleanly unmounted during suspend.
Add a module parameter to set whether cards are assumed removable or
non-removable, with the
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