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

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Message-ID: <20171206045254.GP26021@bombadil.infradead.org>
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.