linux-ext4 - Re: [PATCH 1/3] btrfs: fix inode rwsem regression

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Date:   Wed, 11 Sep 2019 19:21:33 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Goldwyn Rodrigues <rgoldwyn@...e.de>
Cc:     linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-btrfs@...r.kernel.org, hch@...radead.org, andres@...razel.de,
        david@...morbit.com, riteshh@...ux.ibm.com,
        linux-f2fs-devel@...ts.sourceforge.net,
        Goldwyn Rodrigues <rgoldwyn@...e.com>
Subject: Re: [PATCH 1/3] btrfs: fix inode rwsem regression

On Wed, Sep 11, 2019 at 11:45:15AM -0500, Goldwyn Rodrigues wrote:
> From: Goldwyn Rodrigues <rgoldwyn@...e.com>
> 
> 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: edf064e7c6fe ("btrfs: nowait aio support")
> Signed-off-by: Goldwyn Rodrigues <rgoldwyn@...e.com>

The subject seems to be a bit confusing so I'll update it, otherwise
patch added to devel queue, thanks.