From: bfields@fieldses.org (J. Bruce Fields)
To: Christoph Hellwig <hch@infradead.org>
Cc: Masayoshi Mizuma <msys.mizuma@gmail.com>,
Theodore Ts'o <tytso@mit.edu>,
Andreas Dilger <adilger.kernel@dilger.ca>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>,
linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH] fs: i_version mntopt gets visible through /proc/mounts
Date: Wed, 17 Jun 2020 11:58:36 -0400 [thread overview]
Message-ID: <20200617155836.GD13815@fieldses.org> (raw)
In-Reply-To: <20200617080314.GA7147@infradead.org>
On Wed, Jun 17, 2020 at 01:03:14AM -0700, Christoph Hellwig wrote:
> On Tue, Jun 16, 2020 at 04:21:23PM -0400, Masayoshi Mizuma wrote:
> > From: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
> >
> > /proc/mounts doesn't show 'i_version' even if iversion
> > mount option is set to XFS.
> >
> > iversion mount option is a VFS option, not ext4 specific option.
> > Move the handler to show_sb_opts() so that /proc/mounts can show
> > 'i_version' on not only ext4 but also the other filesystem.
>
> SB_I_VERSION is a kernel internal flag. XFS doesn't have an i_version
> mount option.
It probably *should* be a kernel internal flag, but it seems to work as
a mount option too.
By coincidence I've just been looking at a bug report showing that
i_version support is getting accidentally turned off on XFS whenever
userspace does a read-write remount.
Is there someplace in the xfs mount code where it should be throwing out
SB_I_VERSION?
Ideally there'd be entirely different fields for mount options and
internal feature flags. But I don't know, maybe SB_I_VERSION is the
only flag we have like this.
--b.
next prev parent reply other threads:[~2020-06-17 15:58 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-16 20:21 [PATCH] fs: i_version mntopt gets visible through /proc/mounts Masayoshi Mizuma
2020-06-17 8:03 ` Christoph Hellwig
2020-06-17 13:33 ` Masayoshi Mizuma
2020-06-17 15:58 ` J. Bruce Fields [this message]
2020-06-17 17:14 ` Eric Sandeen
2020-06-17 17:24 ` Darrick J. Wong
2020-06-17 17:55 ` Eric Sandeen
2020-06-17 18:18 ` J. Bruce Fields
2020-06-17 18:28 ` Eric Sandeen
2020-06-17 18:45 ` J. Bruce Fields
2020-06-18 1:30 ` Masayoshi Mizuma
2020-06-18 1:44 ` Darrick J. Wong
2020-06-18 3:33 ` Masayoshi Mizuma
2020-06-18 3:05 ` Dave Chinner
2020-06-18 3:45 ` Masayoshi Mizuma
2020-06-18 22:39 ` Dave Chinner
2020-06-19 2:20 ` J. Bruce Fields
2020-06-19 2:44 ` Dave Chinner
2020-06-19 12:04 ` Jeff Layton
2020-06-19 20:40 ` J. Bruce Fields
2020-06-19 22:10 ` Dave Chinner
2020-06-19 22:28 ` J. Bruce Fields
2020-06-20 1:49 ` Dave Chinner
2020-06-20 1:56 ` J. Bruce Fields
2020-06-20 17:00 ` Eric Sandeen
2020-06-20 17:09 ` J. Bruce Fields
2020-06-20 23:54 ` Dave Chinner
2020-06-22 21:26 ` J. Bruce Fields
2020-06-22 22:03 ` Dave Chinner
2020-06-19 13:17 ` Christoph Hellwig
2020-07-13 23:45 ` Eric Sandeen
2020-07-14 8:30 ` Christoph Hellwig
2020-07-14 20:26 ` Eric Sandeen
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