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From: Richard Weinberger <richard@nod.at>
To: Jimmy Perchet <jimmy.perchet@parrot.com>, linux-mtd@lists.infradead.org
Subject: Re: Mount empty UBI volume attached via fastmap may not work
Date: Wed, 26 Apr 2017 15:48:10 +0200	[thread overview]
Message-ID: <6d452782-adec-4cb1-2848-00224226c89a@nod.at> (raw)
In-Reply-To: <1648d3ba-1a2c-d048-e30d-47128bfa6267@parrot.com>

Jimmy,

Am 26.04.2017 um 13:39 schrieb Jimmy Perchet:
>> I'm slow today. I think now I got your problem scenario.
>> You erase all blocks of a volume, face a power-cut before all blocks
>> got erased and then UBIFS fails upon mount since it thinks everything
>> is fine.
> Almost; the power-cut occurs after the update operation :
> 
> $umount data/
> 
> $ubiupdatevol -t /dev/ubi0_0

Ah...

> $cat /sys/class/ubi/ubi0_0/corrupted
> 0
> 
> /*==Power-cut==*/
> 
> $mount -t ubifs /dev/ubi0_0 data/
> 
> UBIFS fails to create the default file-system. My guess is that,
> as Fastmap is used, some LEB may be seen as mapped, and
> this not handled by UBIFS emptiness test.

Yes, this guess might be correct.
Let me think about a better way to handle this.

Thanks,
//richard

      reply	other threads:[~2017-04-26 13:48 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-26  7:46 Mount empty UBI volume attached via fastmap may not work Jimmy Perchet
2017-04-26  7:54 ` Richard Weinberger
2017-04-26  8:04   ` Richard Weinberger
2017-04-26 11:39     ` Jimmy Perchet
2017-04-26 13:48       ` Richard Weinberger [this message]

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