linux-kernel - Re: Linux 2.6.39-rc3

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Message-ID: <4DA4B3FE.2080609@redhat.com>
Date:	Tue, 12 Apr 2011 15:20:14 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	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>,
	Karel Zak <kzak@...hat.com>
Subject: Re: Linux 2.6.39-rc3

On 4/12/11 2:09 PM, Dave Jones wrote:
> On Mon, Apr 11, 2011 at 05:40:11PM -0700, Linus Torvalds wrote:
>  > It's been another almost spookily calm week. Usually this kind of
>  > calmness happens much later in the -rc series (during -rc7 or -rc8,
>  > say), but I'm not going to complain. I'm just still waiting for the
>  > other shoe to drop.
>  
> Here's an odd one.
> 
> my laptop's fstab has
> 
> /dev/mapper/vg_adamo-lv_home /home                   ext4    defaults        1 2
> 
> on 2.6.38, /proc/mounts contains ..
> 
> /dev/mapper/vg_adamo-lv_home /home ext4 rw,seclabel,relatime,barrier=1,data=ordered 0 0
> 
> on 2.6.39rc3 it looks like..
> 
> /dev/mapper/vg_adamo-lv_home /home ext4 rw,seclabel,relatime,user_xattr,barrier=1,data=ordered 0 0
> 
> 
> Which looks like ea6633369458992241599c9d9ebadffaeddec164, so nothing untoward..
> 
> however, the output of mount looks very confused..
> 
> .38:
> /dev/mapper/vg_adamo-lv_home on /home type ext4 (rw,relatime,seclabel,barrier=1,data=ordered)
> 
> .39:
> - on /home type 79a9-4526-888c-1f86d35a6704 (rw,relatime,ext4)
> 
> 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...

Maybe Karel knows?  cc'd...

-Eric

> 
> 	Dave
> 

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