linux-ext4 - Re: [PATCH v5 02/19] fs: don't take the i_lock in inode_inc

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Message-ID: <20180119144351.GA11735@fieldses.org>
Date:   Fri, 19 Jan 2018 09:43:51 -0500
From:   "J. Bruce Fields" <bfields@...ldses.org>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        viro@...iv.linux.org.uk, linux-nfs@...r.kernel.org, neilb@...e.de,
        jack@...e.de, linux-ext4@...r.kernel.org, tytso@....edu,
        adilger.kernel@...ger.ca, linux-xfs@...r.kernel.org,
        darrick.wong@...cle.com, david@...morbit.com,
        linux-btrfs@...r.kernel.org, clm@...com, jbacik@...com,
        dsterba@...e.com, linux-integrity@...r.kernel.org,
        zohar@...ux.vnet.ibm.com, dmitry.kasatkin@...il.com,
        linux-afs@...ts.infradead.org, dhowells@...hat.com,
        jaltman@...istor.com, krzk@...nel.org
Subject: Re: [PATCH v5 02/19] fs: don't take the i_lock in inode_inc_iversion

On Fri, Jan 19, 2018 at 09:36:34AM -0500, Jeff Layton wrote:
> Shrug...we have that problem with the spinlock in place too. The bottom
> line is that reads of this value are not serialized with the increment
> at all.

OK, so this wouldn't even be a new bug.

> I'm not 100% thrilled with this patch, but I think it's probably better
> not to add the i_lock all over the place, even as an interim step in
> cleaning this stuff up.

Makes sense to me.

I've got no comments on the rest of the series, except that I'm all for
it.

Thanks for persisting--it turned out to be more involved than I'd
imagined!

--b.