Cannot mount Sony Ericsson mobile phone, msdosfs too restrictive?

[Brian Chu]

Raaf,

What's the size of the memory stick?  Is it 32MB like Dennis has?

The check for the field that affected you isn't critical to msdosfs'
operation, but the field itself is specified to be non-zero.
Konstantin, is it alright to remove this field?

Brian

On 7/1/07, Dennis Melentyev <dennis.melentyev at gmail.com> wrote:
> Well, had the same problem.
> For me, it looks like SE is using FAT12 (!!!Not 16!!!) on a devive
> larger than 32MB. Could have something slipped off my mind, but quite
> close. It is a BROKEN msdosfs on a stick.
>
> Just re-formated 1Gb flash with FAT32 using card reader and both K750i
> and FreeBSD are happy.
>
> 2007/7/1, Raaf <raaf at zen.mooo.com>:
> > Hi, i got a Sony Ericsson mobile phone that came with a pre-formatted
> > memory stick that i'm unable to mount in FreeBSD (it mounts fine in
> > Linux).
> >
> > After investigating i found out that the FreeBSD msdsofs driver bails
> > out on the following code (the pmp->pm_Heads being zero):
> >
> > ----------------------------------
> > if (!pmp->pm_BytesPerSec || !SecPerClust
> >                 || !pmp->pm_Heads
> > #ifdef PC98
> >                 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) {
> > #else
> >                 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) {
> > #endif
> >                 error = EINVAL;
> >                 goto error_exit;
> >         }
> > ----------------------------------
> >
> > Removing the check for pmp->pm_Heads fixes it for me.
> >
> > Is the check for pmp->pm_Heads really necessary?
> >
> > Grepping through the msdosfs sources i can only see it being used for
> > validation and not used in any calculation (the same applies for the
> > pmp->pm_SecPerTrack value)
> >
> >
> > --- sys/fs/msdosfs/msdosfs_vfsops.c.orig        Sun Jul  1 20:42:14 2007
> > +++ sys/fs/msdosfs/msdosfs_vfsops.c     Sun Jul  1 20:46:57 2007
> > @@ -483,7 +483,6 @@
> >
> >         /* XXX - We should probably check more values here */
> >         if (!pmp->pm_BytesPerSec || !SecPerClust
> > -               || !pmp->pm_Heads
> >  #ifdef PC98
> >                 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) {
> >  #else
> >
> >
> > _______________________________________________
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> >
>
>
> --
> Dennis Melentyev
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