[PATCH 2/2] mtd-utils: integck: add support for volume specific power-cut test

Artem Bityutskiy dedekind1 at gmail.com
Tue May 13 04:00:38 PDT 2014

Hi Mats,

yes, I was a bit confused. But generally I do not immediately like this
patch is that it adds complexity to already complex, not very
well-structured and not very well-commented code.

And it adds another option, which means that the potential user will
have to think about using it or not.

On Tue, 2014-04-15 at 15:07 +0000, Mats Kärrman wrote:
> Both the "-p" and the "-P" options enable UBIFS power-cut tests. AfaIk there is no such thing for UBI (?).
> My problem is that I like to run the tests on my target platform that uses UBIFS as root FS.
> If I enable "power-cut" emulation globally (i.e. echo 1 > /sys/kernel/debug/ubifs/tst_recovery) this will
> enable "power-cuts" not only for the tested partition (good) but also for my root fs (bad).

OK, thanks for explaining.

> UBIFS gives the opportunity to also enable "power-cuts" for a specific UBI volume (e.g.
> echo 1 > /sys/kernel/debug/ubifs/ubi1_0/tst_recovery) but this only works until the UBI partition
> is reattached (the flag is initialized to 0).

Why wouldn't we have this to be the default, and the only way?

> What "-P" does differently from "-p" is that it re-enables the power-cut emulation for the used
> partition before continuing the test after a remount.

Do we really need 2 options for this test? May be we can just use per-FS
knob in the old option?

> It seems that the help-text of integck suggests that the power-cut test mode is available for
> any filesystem that is "able to emulate power-cuts" so the "(currently implemented for UBIFS only)"

Well, this was probably a mistake to add this comment, feel free to kill
it. This is ubifs-specific.

> is there because this is the only fs integck is (currently) able to reenable emulation for. ("-p"
> requires emulation to be enabled before launching integck which took me a while to figure out
> so this should perhaps also be written in the help text).

You are always welcome with a patch :-)

Best Regards,
Artem Bityutskiy

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