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From: Richard Weinberger <richard@nod.at>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: linux-mtd@lists.infradead.org
Subject: Re: UBIFS does not mount after powerfail
Date: Tue, 05 Dec 2017 21:06:28 +0100
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Manfred,

Am Dienstag, 5. Dezember 2017, 20:11:20 CET schrieb Manfred Spraul:
> > So, which file do I need to download to get the image that contains the
> > first error as detected by chk_fs?
> > 
> > The mode of operation of your tool should be:
> > 1. Mount UBIFS
> > 2. Do various filesystem operations
> > 3. Random power-cut (in software)
> > 4. Dump the image to a file X
> > 5. Set chk_fs to 1
> > 6. Mount it again
> > 7. If mount succeeds, drop X, umount and goto 1
> > 
> >     Else if, chk_fs finds a problem. Store file X.
> > 
> > I want file X. :-)
> 
> The tool is in release process, thus let's just wait a bit.
> There is no "goto 1" in my flow.
> 
> Part 1: (done 5x, i.e. with xattr, without xattr, ...)
> 
> 0. create UBI image, create empty UBIFS image.
> 1. Mount UBIFS
> 2. Do various filesystem operations.
>     In the background, record nand operations and store it in a trace.
> 
> Part 2: (done ~100.000 times)
> 1. Create an image file X by replaying from the trace.
> 2. Set chk_fs to 1
> 3. Mount the image
> 7. If mount succeeds: ignore the file X
>     If mount fails: remember file X
> 
> Thus every image is a first error. No image has seen multiple unclean
> unmounts.

Hmm, when does the power-cut occur in your setup?
i.e image-168167.bin and image-168168.bin show different errors and none of 
them fails the chf_fs test. They fail because of other reasons.

Thanks,
//richard