On Wednesday 11 September 2013 22:34:55
tom.edmond@schneider-electric.com
wrote:
> Hi,
>
> We are using an old version of YAFFS in an embedded application (ARM
> processor, NAND flash).
> We 'inherited' the YAFFS sources from the supplier of the OS so can't
> ascertain the version of YAFFS
> - not sure if this helps anyone identify the version but the copyright
> notice at the top of the files reads:-
>
> * Copyright (C) 2002 Aleph One Ltd.
> * for Toby Churchill Ltd and Brightstar Engineering
> *
> * Created by Charles Manning <charles@aleph1.co.uk>
>
> Currently having problems with file system corruption and currently
> analysing the source files to try and
> establish whether the OS wrapper code (suspect this) or the YAFFS code is
> the root of the problem.
>
> My question is:-
>
> Have read the 'YAFFS:HowItWorks' document and understand the file system
> is scanned and re-built
> each time it restarts but can't quite see how garbage collection is
> triggered.
> Have perused the archive mailing list back to start of 2012 and have seen
> some evidence to suggest
> garbage collection gets triggered at a filesystem write.
>
> Can someone confirm that garbage collection is triggered each time the
> filesystem is written to or
> clarify just when it does occur ?
Hello Tom
Yaffs does gc under two conditions:
1. As a parasitic task during writing. ie. All paths that write anything to
the file system (data, object headers, deletion ...) will check if gc should
be performed and do it if necessary).
2. As a background activity (if enabled). This is generally only done under
Linux.
Regards
Charles
>
> Regards
> ___________________________________________________________________________
>__________
>
>
> Tom Edmond | Schneider Electric | Infrastructure Business |
> United Kingdom | Senior Systems Development Engineer
> Phone: +44 (0) 1249 456116 | Fax: +44 (0) 1249 456150 |
> Email: tom.edmond@schneider-electric.com | Site:
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