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Re: [dm-devel] dm-verity: Verification fails but do not see Input/Output Error on read



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Hi Alasdair,

Thanks for your response.

But I am not convinced. Here is why...
1. I tried a bit-more and I was able to get Input/Output Error on certain locations - everytime - I read that location.
(But I still have an open question that on some locations, though the verify reports failure, I do not get an IO Error on read)

2. I do not understand when you say device is live - do you mean mounted? Because I thought that the whole idea of dm-verity was that once the verity device is set-up, it would return EIO when something gets corrupted in the data or hash partitions when that invalid data is read.

Chaitra
________________________________________
From: Alasdair G Kergon [agk redhat com]
Sent: 08 August 2013 13:18
To: Chaitra Bhat
Cc: dm-devel redhat com; Mikulas Patocka
Subject: Re: [dm-devel] dm-verity: Verification fails but do not see    Input/Output Error on read

On Thu, Aug 08, 2013 at 09:01:44AM +0000, Chaitra Bhat wrote:
> So, any idea why do I not get Input/Output Error message when I know that verification is failing at that location?

I think it only verifies the data the first time it is read and doesn't check
for changes underneath while the device is live.

Alasdair


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