Date: Mon, 7 Jul 2014 21:39:15 -0700 From: Kevin Oberman <rkoberman@gmail.com> To: Mathias Picker <Mathias.Picker@virtual-earth.de> Cc: questions@freebsd.org Subject: Re: Cannot create files on exfat card / 10-stable Message-ID: <CAN6yY1t-e=47HRcHVoxD7saDu0KZADf-pt-mU1CZKJ5x-td1vw@mail.gmail.com> In-Reply-To: <1403792937.2308.16.camel@marcopolo.fritz.box> References: <CAN6yY1sHvy0BM2XuSRroSPPXjGV4nR1w60sOg==Sbic72Tw4pQ@mail.gmail.com> <1403792937.2308.16.camel@marcopolo.fritz.box>
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On Thu, Jun 26, 2014 at 7:28 AM, Mathias Picker < Mathias.Picker@virtual-earth.de> wrote: > 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@marcopolo:/mnt # touch test1 > > > touch: test1: Invalid argument > > > root@marcopolo:/mnt # mkdir test1 > > > root@marcopolo:/mnt # touch test1/test > > > touch: test1/test: Invalid argument > > > root@marcopolo:/mnt # ll -d test1 > > > drwxr-xr-x 1 root wheel 131072 16 Feb 19:46 test1/ > > > root@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@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 > > > I have learned a bit more by monitoring the dirty bit with dumpexfat (part of sysutils/exfat-utils) The second bit of Volume State is set for "dirty". If the system is shutdown, the dirty bit is not cleared. If I manually umount the filesystem, the bit is cleared and subsequent mount can be written to. I also noted that, even after the dirty mount of the filesystem, a manual unmount and mount restores the system to its normal condition. It appears that the device is not being correctly unmounted at shutdown. n any case, it is pretty quick to restore normal operations should you need to deal with and exfat filesystem. -- R. Kevin Oberman, Network Engineer, Retired E-mail: rkoberman@gmail.com
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