linux-ext4 - Re: [PATCH] ext4: Don't set dioread_nolock by default for blocksize

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Message-ID: <20200329021728.GI53396@mit.edu>
Date:   Sat, 28 Mar 2020 22:17:28 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>
Cc:     linux-ext4@...r.kernel.org, Jan Kara <jack@...e.cz>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>
Subject: Re: [PATCH] ext4: Don't set dioread_nolock by default for blocksize
 < pagesize

On Sat, Mar 28, 2020 at 01:37:44AM +0530, Ritesh Harjani wrote:
> Currently on calling echo 3 > drop_caches on host machine, we see
> FS corruption in the guest. This happens on Power machine where
> blocksize < pagesize.
> 
> So as a temporary workaound don't enable dioread_nolock by default
> for blocksize < pagesize until we identify the root cause.
> 
> Also emit a warning msg in case if this mount option is manually
> enabled for blocksize < pagesize.
> 
> Reported-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
> Signed-off-by: Ritesh Harjani <riteshh@...ux.ibm.com>

Thanks, applied.

					- Ted