linux-ext4 - Re: [PATCH 2/3] ext4: fix inode rwsem regression

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Date:   Thu, 12 Sep 2019 19:26:14 +1000
From:   Matthew Bobrowski <mbobrowski@...browski.org>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>
Cc:     Goldwyn Rodrigues <rgoldwyn@...e.de>,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-btrfs@...r.kernel.org, hch@...radead.org, andres@...razel.de,
        david@...morbit.com, linux-f2fs-devel@...ts.sourceforge.net,
        Goldwyn Rodrigues <rgoldwyn@...e.com>,
        aneesh.kumar@...ux.ibm.com
Subject: Re: [PATCH 2/3] ext4: fix inode rwsem regression

On Thu, Sep 12, 2019 at 02:22:35PM +0530, Ritesh Harjani wrote:
> cc'd Matthew as well.
> 
> > This is similar to 942491c9e6d6 ("xfs: fix AIM7 regression")
> > Apparently our current rwsem code doesn't like doing the trylock, then
> > lock for real scheme.  So change our read/write methods to just do the
> > trylock for the RWF_NOWAIT case.
> > 
> > Fixes: 728fbc0e10b7 ("ext4: nowait aio support")
> > Signed-off-by: Goldwyn Rodrigues <rgoldwyn@...e.com>
> 
> This patch will conflict with recent iomap patch series.
> So if this is getting queued up before, so iomap patch series will
> need to rebase and factor these changes in the new APIs.

Noted. I've been keeping my eye on this thread, so I'm aware of this.

--<M>--