This is pretty wierd.

The "short op" cache is a write-into cache. That is, the writes into the 
cache do not go all the way to flash, but reside in the cache until the file 
is flushed or closed.

This sounds like the files are not being closed preoperly, but then I'd not 
expect the unmount to happen.

I'll tinker some more....

-- CHarles

On Tuesday 25 January 2005 13:40, Eddie Dawydiuk wrote:
> Charles,
>
> Thank you for the response, I set nShortOpCaches to zero, recompiled, and
> no longer see the problem with files being truncated....
>
> Thanks again,
> Eddie
>
> > I did some testing to try understand better whether this might be a yaffs
> > thing or not.
> >
> > I created some files, unmounted yaffs, remounted yaffs and they were the
> > same.
> >
> > If yaffs is indeed losing the data in this case, then there are a few
> > things
> > that need to be debugged to find out what might be causing the problem
> > here:
> >
> > 1) Is the short op cache enabled? The easy way to tell this is to look in
> > /proc/yaffs.  The short op cache only caches stuff which is not page
> > aligned,
> > so there is potential that this could be where lossy things are
> > happening. You could try turning off the short op cache (set
> > nShortOpCaches to zero in
> > yaffs_fs.c).
> >
> > 2) Is ftpd using memory mapped writes?
> >
> > 3) Do you get the same lossy behaviour when you create files by other
> > means
> > (copy, editor, etc)?
> >
> > -- CHarles
> >
> > On Tuesday 25 January 2005 11:54, Michael Erickson wrote:
> >> Eddie,
> >>
> >> 512-bytes is the size of a TFTP data transfer. The first (and should be
> >> only) transfer that is less than 512-bytes indicates the end of the
> >> file.
> >>
> >> How are you verifying that the original upload is correct? Are you using
> >> an MD5SUM or other fingerprint?
> >>
> >> --mike
> >>
> >> Eddie Dawydiuk wrote:
> >> > Hello yaffers,
> >> >
> >> > I have recently come across a strange problem while using the yaffs
> >> > filesystem. If I upload a file via FTP(troll-ftpd-1.26) everything
> >>
> >> looks
> >>
> >> > ok with regard to the file uploading correctly. But as soon as I
> >>
> >> unmount
> >>
> >> > the partition and remount it the file is truncated to the nearest 512
> >> > byte block. I am using kernel version 2.4.26 and have merged in the
> >>
> >> most
> >>
> >> > recent mtd and yaffs releases. If anyone has any suggestions I would
> >> > really appreciate them.
> >> >
> >> > Thanks,
> >> > Eddie
> >> >
> >> >
> >> > _______________________________________________
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> >> > yaffs@stoneboat.aleph1.co.uk
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> >
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