How to get Btrfs on 2nd partition of USB HDD to automount as read/write
 

Hello,

The following is based on
http://ubuntuforums.org/showthread.php?t=2043016

I have a user with an Xubuntu 12.04.1 laptop, 32-bit. He needs to
use a USB hard disk drive which has 2 partitions: the 1st
partition is NTFS and the 2nd partition is Btrfs.

When he plugs in the hard drive, both partitions auto-mount OK,
except that the Btrfs partition automounts read-only. That is, the
permissions of the directories in /dev are drwx------ for the NTFS
and dr-xr-xr-x for the Btrfs.

How can the OS be set up so that the Btrfs will automount
read/write?

The "dmesg" command shows the following on plug-in of the drive:

[ 7253.520087] usb 2-4: new high-speed USB device number 11 using
ehci_hcd
[ 7253.656344] scsi11 : usb-storage 2-4:1.0
[ 7256.651677] scsi 11:0:0:0: Direct-Access TOSHIBA External
USB 3.0 0001 PQ: 0 ANSI: 6
[ 7256.654722] sd 11:0:0:0: Attached scsi generic sg2 type 0
[ 7256.656970] sd 11:0:0:0: [sdb] 1465149168 512-byte logical
blocks: (750 GB/698 GiB)
[ 7256.660515] sd 11:0:0:0: [sdb] Write Protect is off
[ 7256.660534] sd 11:0:0:0: [sdb] Mode Sense: 1f 00 00 08
[ 7256.662509] sd 11:0:0:0: [sdb] No Caching mode page present
[ 7256.662523] sd 11:0:0:0: [sdb] Assuming drive cache: write
through
[ 7256.668478] sd 11:0:0:0: [sdb] No Caching mode page present
[ 7256.668498] sd 11:0:0:0: [sdb] Assuming drive cache: write
through
[ 7256.673838] sdb: sdb1 sdb2
[ 7256.681474] sd 11:0:0:0: [sdb] No Caching mode page present
[ 7256.681493] sd 11:0:0:0: [sdb] Assuming drive cache: write
through
[ 7256.681507] sd 11:0:0:0: [sdb] Attached SCSI disk
[ 7257.545702] device label partition_label devid 1 transid 19
/dev/sdb2
[ 7257.546790] btrfs: disk space caching is enabled

Neither the "usbmount" nor "pmount" packages are installed, but
"thunar-volman" is installed. I did install "pmount" only to find
that it appears to be meant to be invoked manually, so I un-
installed it again.

"uname -rv" reports:

3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:04:05 UTC 2012

The "groups" command shows that the user is a member of the
following (in addition to a group named after his username):

adm dialout fax cdrom floppy tape sudo dip video plugdev fuse
lpadmin sambashare

The "mount" command shows for the Btrfs partition in question:

/dev/sdb2 on /media/[partition_label] type btrfs
(rw,nosuid,nodev,uhelper=udisks)

(I have substituted [partition_label] for the partition label,
which is all letters, no punctuation marks.)

Because "mount" shows "rw", does that mean that it is the
configuration of Btrfs, not the configuration of automounting, that
is at issue?

I appreciate any help.

-dg1727


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How to get Btrfs on 2nd partition of USB HDD to automount as read/write
 

On Fri, 17 Aug 2012 15:07:06 -0400 dg1727 <dg1727@hushmail.com>
wrote:
>Hello,
>
>The following is based on
>http://ubuntuforums.org/showthread.php?t=2043016
>
>I have a user with an Xubuntu 12.04.1 laptop, 32-bit. He needs to
>use a USB hard disk drive which has 2 partitions: the 1st
>partition is NTFS and the 2nd partition is Btrfs.
>
>When he plugs in the hard drive, both partitions auto-mount OK,
>except that the Btrfs partition automounts read-only. That is,
>the permissions of the directories in /dev are drwx------ for the
>NTFS and dr-xr-xr-x for the Btrfs.
>
>How can the OS be set up so that the Btrfs will automount
>read/write?
>
>The "dmesg" command shows the following on plug-in of the drive:
>
>[ 7253.520087] usb 2-4: new high-speed USB device number 11 using
>ehci_hcd
>[ 7253.656344] scsi11 : usb-storage 2-4:1.0
>[ 7256.651677] scsi 11:0:0:0: Direct-Access TOSHIBA External
>USB 3.0 0001 PQ: 0 ANSI: 6
>[ 7256.654722] sd 11:0:0:0: Attached scsi generic sg2 type 0
>[ 7256.656970] sd 11:0:0:0: [sdb] 1465149168 512-byte logical
>blocks: (750 GB/698 GiB)
>[ 7256.660515] sd 11:0:0:0: [sdb] Write Protect is off
>[ 7256.660534] sd 11:0:0:0: [sdb] Mode Sense: 1f 00 00 08
>[ 7256.662509] sd 11:0:0:0: [sdb] No Caching mode page present
>[ 7256.662523] sd 11:0:0:0: [sdb] Assuming drive cache: write
>through
>[ 7256.668478] sd 11:0:0:0: [sdb] No Caching mode page present
>[ 7256.668498] sd 11:0:0:0: [sdb] Assuming drive cache: write
>through
>[ 7256.673838] sdb: sdb1 sdb2
>[ 7256.681474] sd 11:0:0:0: [sdb] No Caching mode page present
>[ 7256.681493] sd 11:0:0:0: [sdb] Assuming drive cache: write
>through
>[ 7256.681507] sd 11:0:0:0: [sdb] Attached SCSI disk
>[ 7257.545702] device label partition_label devid 1 transid 19
>/dev/sdb2
>[ 7257.546790] btrfs: disk space caching is enabled
>
>Neither the "usbmount" nor "pmount" packages are installed, but
>"thunar-volman" is installed. I did install "pmount" only to find
>that it appears to be meant to be invoked manually, so I un-
>installed it again.
>
>"uname -rv" reports:
>
> 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:04:05 UTC 2012
>
>The "groups" command shows that the user is a member of the
>following (in addition to a group named after his username):
>
> adm dialout fax cdrom floppy tape sudo dip video plugdev fuse
>lpadmin sambashare
>
>The "mount" command shows for the Btrfs partition in question:
>
> /dev/sdb2 on /media/[partition_label] type btrfs
>(rw,nosuid,nodev,uhelper=udisks)
>
>(I have substituted [partition_label] for the partition label,
>which is all letters, no punctuation marks.)
>
>Because "mount" shows "rw", does that mean that it is the
>configuration of Btrfs, not the configuration of automounting,
>that is at issue?
>
>I appreciate any help.
>
>-dg1727

Thanks in advance for any useful comments about this issue.

Sorry that this follow-up message won't show up under the same
thread as the original message, but I think that any future follow-
ups by me to this list (even for different issues) will be
correctly under the original thread. (On the list options page, I
have turned on "Receive your own posts to the list?" and intend to
reply to those in future so the threading will work right.)

-dg1727


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How to get Btrfs on 2nd partition of USB HDD to automount as read/write
 

On Sun, 19 Aug 2012 15:45:21 -0400 dg1727 <dg1727@hushmail.com>
wrote:
>On Fri, 17 Aug 2012 15:07:06 -0400 dg1727 <dg1727@hushmail.com>
>wrote:
>>I have a user with an Xubuntu 12.04.1 laptop, 32-bit. He needs
>>to use a USB hard disk drive which has 2 partitions: the 1st
>>partition is NTFS and the 2nd partition is Btrfs.
>>
>>When he plugs in the hard drive, both partitions auto-mount OK,
>>except that the Btrfs partition automounts read-only. That is,
>>the permissions of the directories in /dev/media are drwx------
>>for the NTFS and dr-xr-xr-x for the Btrfs.
>>
>>How can the OS be set up so that the Btrfs will automount
>>read/write?
>>
>>"uname -rv" reports:
>>
>> 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:04:05 UTC 2012

The workaround and the future solution are documented in:

http://www.spinics.net/lists/linux-btrfs/msg18520.html
http://www.spinics.net/lists/linux-btrfs/msg18531.html

-dg1727


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