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Message #00196
[Merge] lp:~blair/cloud-init/cloud-init into lp:cloud-init
The proposal to merge lp:~blair/cloud-init/cloud-init into lp:cloud-init has been updated.
Commit Message changed to:
Support resizing btrfs filesystems.
The existing code has two issues with btrfs:
1) The command to resize a btrfs filesystem uses a path to the mount
point, not the underlying device:
$ btrfs filesystem resize max /dev/vda1
ERROR: unable to resize '/dev/vda1' - Inappropriate ioctl for device
Resize '/dev/vda1' of 'max'
$ btrfs filesystem resize max /
Resize '/' of 'max'
2) The code that is given a path and finds the ID of the device where
the path is mounted doesn't work for btrfs:
Use /proc/$$/mountinfo to find the device where path is mounted.
This is done because with a btrfs filesystem using os.stat(path)
does not return the ID of the device.
Here, / has a device of 18 (decimal).
$ stat /
File: '/'
Size: 234 Blocks: 0 IO Block: 4096 directory
Device: 12h/18d Inode: 256 Links: 1
Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2013-01-13 07:31:04.358011255 +0000
Modify: 2013-01-13 18:48:25.930011255 +0000
Change: 2013-01-13 18:48:25.930011255 +0000
Birth: -
Find where / is mounted:
$ mount | grep ' / '
/dev/vda1 on / type btrfs (rw,subvol=@,compress=lzo)
And the device ID for /dev/vda1 is not 18:
$ ls -l /dev/vda1
brw-rw---- 1 root disk 253, 1 Jan 13 08:29 /dev/vda1
So use /proc/$$/mountinfo to find the device underlying the input
path.
For more details, see:
https://code.launchpad.net/~blair/cloud-init/cloud-init/+merge/143347
--
https://code.launchpad.net/~blair/cloud-init/cloud-init/+merge/143347
Your team cloud init development team is requested to review the proposed merge of lp:~blair/cloud-init/cloud-init into lp:cloud-init.
References