[Bug 891688] Re: Suspend/Resume adds "commit=600, commit=0" options to mounted USB drives

[Martin Pitt]

I can reproduce this. But nothing to do with udisks, I get the same
behaviour if I kill udisks-daemon, chmod it to 0, log out of the desktop
session (so no gvfs etc. either), and just run "sudo pm-suspend" on a
terminal. Then my mounted USB stick as well as my internal /dev/sda1
(which carries my root partition) get an extra "commit=600" in
/proc/mounts. In /etc/fstab / mount output, sdb1 (USB stick)
additionally gets "commit=0". In dmesg I see

   EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro,commit=600
   EXT4-fs (sdb1): re-mounted. Opts: commit=600

This does not happen if I use a raw "echo mem | sudo tee
/sys/power/state". Then sdb1 just gets unmounted and not re-mounted at
all.

The "commit" mount option comes from /usr/lib/pm-utils/power.d/journal-
commit.

So the root of the bug is that calling "mount -o remount,commit=600
/dev/sdb1" always appends the new option to /etc/mtab instead of
recognizing an already existing one. This doesn't happen in
/proc/mounts, so the kernel side is fine.

** Changed in: util-linux (Ubuntu)
       Status: New => Confirmed

** Changed in: util-linux (Ubuntu)
     Assignee: (unassigned) => Canonical Desktop Team (canonical-desktop-team)

** Summary changed:

- Suspend/Resume adds "commit=600,commit=0" options to mounted USB drives
+ mount -o remount always appends options to /etc/mtab even if they already exist

** Changed in: util-linux (Ubuntu)
   Importance: Undecided => Low

** Changed in: util-linux (Ubuntu)
       Status: Confirmed => Triaged

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https://bugs.launchpad.net/bugs/891688

Title:
  mount -o remount always appends options to /etc/mtab even if they
  already exist

Status in “util-linux” package in Ubuntu:
  Triaged

Bug description:
  I have an external usb HDD attached to my system to store parts of
  /home. Every time I suspend and resume the laptop, mount appends a
  subset of the mount options to the already existing list.

  I currently have this in the output of mount:

  /dev/sdc1 on /media/LaCie type ext4
  (rw,nosuid,nodev,commit=600,commit=600,commit=0,commit=600,commit=0,commit=600,commit=0,commit=0,commit=0,commit=600,commit=0,commit=0,commit=600,commit=0,commit=600,commit=600,commit=0,uhelper=udisks)

  /etc/fstab doesn't have a line for this disk.

  ---------

  Reproducer:
  $ sudo modprobe scsi_debug
  # ATTENTION! MAKE TRIPLE-SURE ABOUT THE DEVICE NAME HERE!
  $ sudo mkfs.ext4 /dev/sdb
  $ sudo mount /dev/sdb /mnt
  $ grep sdb /etc/mtab
  /dev/sdb /mnt ext4 rw 0 0

  $ sudo mount -o remount,commit=600 /dev/sdb
  $ grep sdb /etc/mtab
  /dev/sdb /mnt ext4 rw,commit=600 0 0

  $ sudo mount -o remount,commit=600 /dev/sdb
  $ grep sdb /etc/mtab
  /dev/sdb /mnt ext4 rw,commit=600,commit=600 0 0

  
  ----------

  
  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: mount 2.19.1-2ubuntu3
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  CheckboxSubmission: ebb646ad5c6c4ca2fe9420855758001f
  CheckboxSystem: 7e42599bda39ea7ff8b528272b6ef52b
  Date: Thu Nov 17 21:29:08 2011
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64+mac (20110127)
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
   LC_PAPER=a4
  SourcePackage: util-linux
  UpgradeStatus: Upgraded to oneiric on 2011-10-15 (33 days ago)

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