From: Eric Sandeen <sandeen@redhat.com>
To: Timofey Titovets <nefelim4ag@gmail.com>,
linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: Does btrfs use crc32 for error correction?
Date: Tue, 19 Sep 2017 11:51:24 -0500 [thread overview]
Message-ID: <63fd4cdb-52d4-4aee-cc82-dbb7eba72a06@redhat.com> (raw)
In-Reply-To: <CAGqmi74kxPpkuYCBwfdyzxUKAHE6TP9x1FGDz0FURud21u=nOA@mail.gmail.com>
On 9/19/17 10:35 AM, Timofey Titovets wrote:
> Stupid question:
> Does btrfs use crc32 for error correction?
> If no, why?
>
> (AFAIK if using CRC that possible to fix 1 bit flip)
>
> P.S. I try check that (i create image, create text file, flip bit, try
> read and btrfs show IO-error)
>
> Thanks!
I wasn't aware that crc32 could (in general) be used for single bit correction; I've read up on that, and it seems pretty cool.
However, I don't think that the generator polynomial used in crc32c /can/ be used for error correction. I just skimmed some reading, but that seems to be the case if I understand it correctly.
-Eric
next prev parent reply other threads:[~2017-09-19 16:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-19 15:35 Does btrfs use crc32 for error correction? Timofey Titovets
2017-09-19 15:40 ` Hugo Mills
2017-09-19 16:51 ` Eric Sandeen [this message]
2017-09-19 18:04 ` Marat Khalili
2017-09-20 1:52 ` Timofey Titovets
2017-09-20 22:04 ` Timofey Titovets
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