On Wednesday 21 March 2007 01:50,
ian@brightstareng.com wrote:
> On Tuesday 20 March 2007 06:31, Vitaly Wool wrote:
> > > The attached patch implements saving of yaffs checkpoint in
> > > case fs is remounted read-only. This allows the usage of
> > > checkpoint mechanizm even if, for some reason, the system
> > > can not cleanly unmount yaffs filesystem but can remount it
> > > read-only.
>
> Does this change mean that when a user mounts Yaffs fs read-only
> that write operations may take place to the NAND media?
I'd have to go through the code but I believe that this is the case in certain
conditions.
If there is no checkpoint and yaffs scans, then as stuff is being scanned the
obsolete stuff can be deleted. It is perhaps hard to understand why this
might happen, but here is a scenario:
If you have a file open and unlink it, that file still exists and can be used.
It only gets deleted when the handle to the file is released. If the system
was reset (unclean power down), then the scan would pick this up and could do
the deletion.
-- CHarles
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