lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Thu, 14 Oct 2021 10:35:00 +0100
From:   Pavel Begunkov <>
To:     Christoph Hellwig <>
Cc:     Jens Axboe <>,,
Subject: Re: [PATCH v2 2/3] block: don't hide inode from block_device users

On 10/14/21 05:51, Christoph Hellwig wrote:
> On Wed, Oct 13, 2021 at 07:44:20PM +0100, Pavel Begunkov wrote:
>> Mildly hot in io_uring w/o fixed files, but that's not peak perf,
>> but would also be great to get rid of bdev->bd_inode dereference,
>> e.g. lots of in fops.c.
>> Are you going to just hid the dereference in helpers or kill it
>> with some offseting magic?
> The only real hot path uses I found is the size (which you and Jens
> already seem to have moved to use something out of the inode for the
> fast path),  and maybe the blkbits for which we could do the same.
> So basically the idea is to not touch the inode in the hot path,
> and use accessors helpers in bdev.c that could do the offsetof trick.

I see, sounds good

Pavel Begunkov

Powered by blists - more mailing lists