linux-kernel - Re: [PATCH v7 14/14] xfs, dax: introduce xfs_break_dax

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Date:   Thu, 22 Mar 2018 18:02:52 +0100
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Christoph Hellwig <hch@....de>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Jan Kara <jack@...e.cz>, Dave Chinner <david@...morbit.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 14/14] xfs, dax: introduce xfs_break_dax_layouts()

On Thu, Mar 22, 2018 at 09:28:11AM -0700, Dan Williams wrote:
> I can switch to the for() loop model, but it isn't 'done' flag, it's a
> 'retry' flag. I.e. if xfs_break_leased_layouts() dropped
> XFS_MMAPLOCK_EXCL we need to retry xfs_break_dax_layouts(), and if

Oh, indeed.

> xfs_break_dax_layouts() slept we need to immediately retry it.
> So, how
> about this?

Ah, with that that the loop doesn't work too well, especially the
continue inside a switch statement is probably not to good.  I guess
we should just stick to your original, modulo better variable naming.