linux-kernel - Re: Linux 2.6.39-rc3

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Message-ID: <20110412202719.GM6764@nb.net.home>
Date:	Tue, 12 Apr 2011 22:27:19 +0200
From:	Karel Zak <kzak@...hat.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: Linux 2.6.39-rc3

On Tue, Apr 12, 2011 at 03:20:14PM -0500, Eric Sandeen wrote:
> > It looks like /proc/self/mountinfo broke abi.
> > 
> > .38:
> > 48 45 253:3 / /home rw,relatime - ext4 /dev/mapper/vg_adamo-lv_home rw,seclabel,barrier=1,data=ordered
> > 
> > .39:
> > 46 22 253:3 / /home rw,relatime uuid:f3971858-79a9-4526-888c-1f86d35a6704 - ext4 /dev/mapper/vg_adamo-lv_home rw,seclabel,user_xattr,barrier=1,data=ordered
> > 
> 
> so it's supposed to be like this, from Documentation/filesystems/proc.txt:
> 
> > This file contains lines of the form:
> > 
> > 36 35 98:0 /mnt1 /mnt2 rw,noatime master:1 - ext3 /dev/root rw,errors=continue
> > (1)(2)(3)   (4)   (5)      (6)      (7)   (8) (9)   (10)         (11)
> > 
> > (1) mount ID:  unique identifier of the mount (may be reused after umount)
> > (2) parent ID:  ID of parent (or of self for the top of the mount tree)
> > (3) major:minor:  value of st_dev for files on filesystem
> > (4) root:  root of the mount within the filesystem
> > (5) mount point:  mount point relative to the process's root
> > (6) mount options:  per mount options
> > (7) optional fields:  zero or more fields of the form "tag[:value]"
> > (8) separator:  marks the end of the optional fields
> > (9) filesystem type:  name of filesystem of the form "type[.subtype]"
> > (10) mount source:  filesystem specific information or "none"
> > (11) super options:  per super block options
> 
> it does seem that the new UUID info is in a perfectly fine place
> (the optional fields slot), at least per the docs, so I guess I
> might blame the mount binary for not following the aforementioned
> rules...

 Yes, I agree. Already discussed at lkml and linux-fs :-)
 http://thread.gmane.org/gmane.linux.kernel/1121533 

> Maybe Karel knows?  cc'd...

 Already fixed in util-linux upstream.

    Karel

-- 
 Karel Zak  <kzak@...hat.com>
 http://karelzak.blogspot.com
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