Cannot create files on exfat card / 10-stable

[Mathias Picker]

Am Mittwoch, den 25.06.2014, 13:48 -0700 schrieb Kevin Oberman:
> > Hi all,
> > 
> > I just got my first exfat formatted sdxc card.
> > 
> > If I mount it with (as root) mount.exfat /dev/da2s1 /mnt I can read the
> > content, create *directories*, but *not files*???
> >
> >
> >     root at marcopolo:/mnt # touch test1
> >     touch: test1: Invalid argument
> >     root at marcopolo:/mnt # mkdir test1
> >     root at marcopolo:/mnt # touch test1/test
> >     touch: test1/test: Invalid argument
> >     root at marcopolo:/mnt # ll -d test1
> >     drwxr-xr-x  1 root  wheel  131072 16 Feb 19:46 test1/
> >     root at marcopolo:/mnt # ll test1
> >     total 0
> >
> >
> >
> > Shouldn't this work?
> >
> > I rebuilt fusefs-lib and fusefs-exfat with gcc48, same result...
> >
> > This is on a recent stable:
> > marcopolo% uname -a
> > FreeBSD marcopolo 10.0-STABLE FreeBSD 10.0-STABLE #14 r261827: Thu Feb
> > 13 13:13:01 CET 2014     mathiasp at marcopolo:/usr/obj/usr/src/sys/GENERIC
> > amd64
> >
> > The card is a Sandisk Extreme MicroSDXC 64Gb. Works fine in my phone.
> >
> > Any tips, hints, experiences?
> >
> > Thanks, Mathias
> 
> I have no answer as I found this message in the archive while
> researching the root cause of the problem.
> 

Thanks, first feedback, now I finally know it's not just me...
> 
> Workaround: After writing to the device on FreeBSD, put the card into
> a Windows system. (It will also be usable to write to the device.) 
> Open an explorer (not Internet Explorer) window
> Right click on the ExFAT device
> Select "Properties" 
> In the Properties window, select the "Tools" tab
> 
> In the tools window click "Check now"
> 
> In the disk check window click start
> 
> No errors should be found, but the disk will now be writable on
> Windows. Note that the directories you appeared to be creating on
> FreeBSD will be gone.
> 
> Eject the media and mount it on the FreeBSD system I t will be
> writable until it is re-mounted.

:) Interesting approach, I switched to FAT for now, works well enough
for me...
> 
> 
> I believe the problem is that unmounting the file system fails to mark
> the fs as clean. You might notice that a message that the device was
> not cleanly dismounted is printed to the console and messages when the
> device is re-mounted on FreeBSD. There is no fsck for ExFAT, so I need
> to use Windows to do the same job. 
> 
> 
> It looks like all that is needed is to clear the second bit of byte
> 106 of the VBR (block 0). I will try this some day when I am feeling
> brave.
> 
> 
> I'd love to see this fixed 

Me too! But way over my head.

Again, thanks for the feedback!

Mathias
> 
> -- 
> R. Kevin Oberman, Network Engineer, Retired
> E-mail: rkoberman at gmail.com
>