linux-kernel - Re: [PATCH v4 72/73] xfs: Convert mru cache to XArray

lists.openwall.net		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:   Tue, 5 Dec 2017 20:52:54 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Dave Chinner <david@...morbit.com>
Cc:     Matthew Wilcox <mawilcox@...rosoft.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Jens Axboe <axboe@...nel.dk>,
        Rehas Sachdeva <aquannie@...il.com>, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-nilfs@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 72/73] xfs: Convert mru cache to XArray

On Tue, Dec 05, 2017 at 08:45:49PM -0800, Matthew Wilcox wrote:
> The dquot code is just going to have to live with the fact that there's
> additional locking going on that it doesn't need.  I'm open to getting
> rid of the irqsafety, but we can't give up the spinlock protection
> without giving up the RCU/lockdep analysis and the ability to move nodes.
> I don't suppose the dquot code can 

Oops, thought I'd finished writing this paragraph.

I don't suppose the dquot code can be restructured to use the xa_lock to
protect, say, qi_dquots?  I suspect not, since you wouldn't know which
of the three xarray locks to use.