linux-ext4 - Re: [PATCH] misc: add e2mmpstatus utility

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Message-Id: <F976B3B9-90C4-446E-B8D4-49571CA535A4@dilger.ca>
Date:   Fri, 29 Dec 2017 16:02:04 -0700
From:   Andreas Dilger <adilger@...ger.ca>
To:     Theodore Ts'o <tytso@....edu>
Cc:     linux-ext4 <linux-ext4@...r.kernel.org>,
        Shuichi Ihara <sihara@....com>, Li Xi <lixi@....com>,
        Wang Shilong <wshilong@....com>
Subject: Re: [PATCH] misc: add e2mmpstatus utility

On Dec 22, 2017, at 10:17 AM, Theodore Ts'o <tytso@....edu> wrote:
> 
> On Fri, Dec 22, 2017 at 02:22:44AM -0700, Andreas Dilger wrote:
>> From: Shuichi Ihara <sihara@....com>
>> 
>> e2mmpstatus is an MMP helper utility to read status from an MMP block.
>> It outputs the latest MMP updated nodename and time for the device.
> 
> Why not include this into dumpe2fs?  Maybe dumpe2fs -m to just print
> the MMP information and include the MMP nodetime and time for either
> the full dumpe2fs or dumpe2fs -h output?

That would definitely be an option.  The mmpstatus utility was written by
DDN, and I'm passing it on after some code cleanup.

I think it would be reasonable to include the other MMP fields into the
dumpe2fs output, and then run the full MMP activity check if called with
"-m" or named as "mmpstatus".  I don't want dumpe2fs to be blocked on
the MMP update checking all the time, since that can be slow.

I'll see if I can get a patch out in the next couple of days.

Cheers, Andreas