[Yaffs] YAFFS2 Issues

[Jeremy Fillingim]

Hi guys,

I have a custom PPC based system on which I have been running 2.6.10 +
board specific changes. The flash part that we are using is a 256MB
large page device (2048 page bytes + 64 spare bytes).

Up to this point I have been using JFFS2 + Summary support (head of MTD CVS)
with a small root partition (32MB) and a second large partition (>200MB). The
JFFS2 performance is decent in most cases, but mount times can be terrible.

I wanted to evaluate YAFFS2 as a possible replacement for JFFS2, so I pulled
the latest YAFFS2 code out of CVS and updated my MTD to the latest CVS. A few
minor changes to the Makefile and Kconfig stuff was all that was required to
get YAFFS2 compiled.

I am able to successfully mount an empty partition, and it "looks" like
a write to that partition succeeds. However, when I attempt to unmount the
YAFFS2 partition, I get a kernel oops. When I remount the partition,
my files do not show up.

This is the message that I receive when I unmount after touching a file
on the YAFFS2 partition.

VFS: Busy inodes after unmount. Self-destruct in 5 seconds.  Have a nice day...
idr_remove called for id=4 which is not allocated.
Call trace:
 [c00b44e0] idr_remove+0x158/0x1f0
 [c004eac8] kill_anon_super+0x3c/0x6c
 [c004d964] deactivate_super+0xa0/0xd4
 [c0065cf4] __mntput+0x30/0x44
 [c0055798] path_release_on_umount+0x4c/0x60
 [c00665c8] sys_umount+0x2bc/0x2d4
 [c0002a00] ret_from_syscall+0x0/0x48

I did my MTD and YAFFS2 CVS checkouts on Friday April 15.

Thank you in advance for any insight you may have.

On Sun, Apr 17, 2005 at 06:23:25PM +0800, zheng wei (jeanwelly@gmail.com) wrote:
> I want to use yaffs on 2.6.11, my cpu is 2410.
> I am not sure whether I should update the MTD in 2.6.11.
> But now I found ECC in mtd can't work correctly on nandflash.
> Also I want to use yaffs as a root fs. How can I get started?
> Thanks for any idea.
> 
> On 4/17/05, Wookey <wookey@aleph1.co.uk> wrote:
> > +++ Sergei Sharonov [05-04-14 10:33 -0500]:
> > > Hi,
> > >
> > > I am working on ARM9/linux2.6.10 based system with a large
> > > (256 MByte) NAND storage. Currently the filesystem used is jffs2.
> > > Unfortunately the mount time is unacceptably long and I am
> > > looking for an alternative. Can anybody comment on status
> > > of YAFFS2? Note that version 2 is required since NAND page
> > > size is 2 k.
> > 
> > People are using YAFFS2 successfully. I'm not sure if any commercial products
> > have actually shipped with it yet, but it is now tested and functional.
> > 
> > For best mount-time splitting your flash into more than one partition is
> > often smart so you can boot from a small partition and give user feedback
> > whilst mounting a larger data partition. Obviously this doesn't suit all
> > applications.
> > 
> > We do have a plan for implementing checkpointing for much faster booting
> > (under normal circumstances) but this work has not yet been sponsored by
> > anyone.
> > 
> > Wookey
> > --
> > Aleph One Ltd, Bottisham, CAMBRIDGE, CB5 9BA, UK  Tel +44 (0) 1223 811679
> > work: http://www.aleph1.co.uk/     play: http://www.chaos.org.uk/~wookey/
> > 
> > _______________________________________________
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> > 
> 
> 
> -- 
> ---------
> jeanwelly
> Email:  jeanwelly@gmail.com
> China
> 
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