[Bug 435192] Re: Automatic mounting of read only ntfs partition on usb device fails

Martin Pitt martin.pitt at ubuntu.com
Mon Sep 10 05:44:32 UTC 2012 

** Description changed:

  [Impact]
  OEM customers raise this issue, thinking that the error message can be misleading to inexperienced users.
  
  [Fix]
  See attachment and merge proposals.
  
  [Test Case]
  Format a SD card with NTFS, lock the SD card as write-protected, insert the card into the SD card slot. If the card is mounted as read-only, the bug is fixed.
  
  [Regression Potential]
+ To ensure the patch does not cause mounting to fail completely or mounting of writable devices as readonly, verification should include both writable and readonly NTFS partitions.
  
- The fix posted looks shouldn't cause regression.
+ [Regression testing]
+ The udisks2 test suite covers both read-only and writable NTFS partitions:
+ http://cgit.freedesktop.org/udisks/tree/src/tests/integration-test
+ 
+ You can download it and run it against the installed system binaries; it
+ will use scsi-debug for a virtual hard disk/CD-ROM, and not touch any of
+ your real partitions.
+ 
+ With the current versions in the archive, you get:
+ 
+ ======================================================================
+ ERROR: test_ntfs (__main__.FS)
+ fs: NTFS
+ ----------------------------------------------------------------------
+ Traceback (most recent call last):
+   File "src/tests/integration-test", line 636, in test_ntfs
+     self._do_fs_check('ntfs')
+   File "src/tests/integration-test", line 758, in _do_fs_check
+     self._do_udisks_check(type)
+   File "src/tests/integration-test", line 931, in _do_udisks_check
+     mount_path = cd_fs.call_mount_sync(no_options, None)
+   File "/usr/lib/python3/dist-packages/gi/types.py", line 47, in function
+     return info.invoke(*args, **kwargs)
+ gi._glib.GError: GDBus.Error:org.freedesktop.UDisks2.Error.Failed: Error
+ mounting /dev/sr1 at /media/root/2FB591B374B26011: Command-line `mount -t
+ "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=0,gid=0,dmask=0077,fmask=0177"
+ "/dev/sr1" "/media/root/2FB591B374B26011"' exited with non-zero exit status 18:
+ Error opening '/dev/sr1': Read-only file system
+ Failed to mount '/dev/sr1': Read-only file system
+ 
+ With the proposed version, the test succeeds.
+ 
+ If you prefer, you can also run the steps manually; described in
+ http://bugs.debian.org/686914
  
  [Original Report]
  Mounting of read only NTFS filesystem gives a following error popup:
  Cannot mount volume.
  Unable to mount the volume '<Volume name>'.
  Details:
  Error opening '/dev/sdb2': Read-only file system
  Failed to mount '/dev/sdb2': Read-only file system
  
  I believe this should be mounted as read-only instead of an error
  message.
  
  Mounting by hand with the "-o ro" argument works as expected.
  ---
  Architecture: i386
  DistroRelease: Ubuntu 10.04
  NonfreeKernelModules: fglrx
  Package: mountall 2.15
  PackageArchitecture: i386
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.utf8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.32-24.39-generic 2.6.32.15+drm33.5
  Tags: lucid
  Uname: Linux 2.6.32-24-generic i686
  UserGroups: adm admin audio cdrom dialout dip fax fuse lpadmin netdev plugdev sambashare tape video

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to ntfs-3g in Ubuntu.
https://bugs.launchpad.net/bugs/435192

Title:
  Automatic mounting of read only ntfs partition on usb device fails

Status in OEM Priority Project:
  In Progress
Status in OEM Priority Project precise series:
  In Progress
Status in abstraction for enumerating and managing block devices:
  Confirmed
Status in “ntfs-3g” package in Ubuntu:
  Fix Released
Status in “udisks” package in Ubuntu:
  Invalid
Status in “udisks2” package in Ubuntu:
  Won't Fix
Status in “ntfs-3g” source package in Precise:
  Triaged
Status in “udisks” source package in Precise:
  Won't Fix
Status in “ntfs-3g” source package in Quantal:
  Fix Released
Status in “udisks” source package in Quantal:
  Invalid
Status in “udisks2” source package in Quantal:
  Won't Fix
Status in “ntfs-3g” package in Debian:
  New

Bug description:
  [Impact]
  OEM customers raise this issue, thinking that the error message can be misleading to inexperienced users.

  [Fix]
  See attachment and merge proposals.

  [Test Case]
  Format a SD card with NTFS, lock the SD card as write-protected, insert the card into the SD card slot. If the card is mounted as read-only, the bug is fixed.

  [Regression Potential]
  To ensure the patch does not cause mounting to fail completely or mounting of writable devices as readonly, verification should include both writable and readonly NTFS partitions.

  [Regression testing]
  The udisks2 test suite covers both read-only and writable NTFS partitions:
  http://cgit.freedesktop.org/udisks/tree/src/tests/integration-test

  You can download it and run it against the installed system binaries;
  it will use scsi-debug for a virtual hard disk/CD-ROM, and not touch
  any of your real partitions.

  With the current versions in the archive, you get:

  ======================================================================
  ERROR: test_ntfs (__main__.FS)
  fs: NTFS
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "src/tests/integration-test", line 636, in test_ntfs
      self._do_fs_check('ntfs')
    File "src/tests/integration-test", line 758, in _do_fs_check
      self._do_udisks_check(type)
    File "src/tests/integration-test", line 931, in _do_udisks_check
      mount_path = cd_fs.call_mount_sync(no_options, None)
    File "/usr/lib/python3/dist-packages/gi/types.py", line 47, in function
      return info.invoke(*args, **kwargs)
  gi._glib.GError: GDBus.Error:org.freedesktop.UDisks2.Error.Failed: Error
  mounting /dev/sr1 at /media/root/2FB591B374B26011: Command-line `mount -t
  "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=0,gid=0,dmask=0077,fmask=0177"
  "/dev/sr1" "/media/root/2FB591B374B26011"' exited with non-zero exit status 18:
  Error opening '/dev/sr1': Read-only file system
  Failed to mount '/dev/sr1': Read-only file system

  With the proposed version, the test succeeds.

  If you prefer, you can also run the steps manually; described in
  http://bugs.debian.org/686914

  [Original Report]
  Mounting of read only NTFS filesystem gives a following error popup:
  Cannot mount volume.
  Unable to mount the volume '<Volume name>'.
  Details:
  Error opening '/dev/sdb2': Read-only file system
  Failed to mount '/dev/sdb2': Read-only file system

  I believe this should be mounted as read-only instead of an error
  message.

  Mounting by hand with the "-o ro" argument works as expected.
  ---
  Architecture: i386
  DistroRelease: Ubuntu 10.04
  NonfreeKernelModules: fglrx
  Package: mountall 2.15
  PackageArchitecture: i386
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.utf8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.32-24.39-generic 2.6.32.15+drm33.5
  Tags: lucid
  Uname: Linux 2.6.32-24-generic i686
  UserGroups: adm admin audio cdrom dialout dip fax fuse lpadmin netdev plugdev sambashare tape video

To manage notifications about this bug go to:
https://bugs.launchpad.net/oem-priority/+bug/435192/+subscriptions

More information about the foundations-bugs mailing list