linux-kernel - Re: [PATCH AUTOSEL 4.19 059/206] ext4: make dioread

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Message-ID: <20200918025859.GB3518637@gmail.com>
Date:   Thu, 17 Sep 2020 19:58:59 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.19 059/206] ext4: make dioread_nolock the
 default

On Thu, Sep 17, 2020 at 10:05:35PM -0400, Sasha Levin wrote:
> From: Theodore Ts'o <tytso@....edu>
> 
> [ Upstream commit 244adf6426ee31a83f397b700d964cff12a247d3 ]
> 
> This fixes the direct I/O versus writeback race which can reveal stale
> data, and it improves the tail latency of commits on slow devices.
> 
> Link: https://lore.kernel.org/r/20200125022254.1101588-1-tytso@mit.edu
> Signed-off-by: Theodore Ts'o <tytso@....edu>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

Any particular reason to be backporting this?  I thought I saw some fixes for
dioread_nolock go by, after it was made the default.  Are you getting all of
those fixes too?

- Eric