Red Hat Bugzilla – Bug 962143
RFE: add support for resize of btrfs filesystems
Last modified: 2018-02-14 21:36:57 EST
Description of problem:
Guide partitioning's "Reclaim Disk Space" dialog, under Reclaimable Space, lists Btrfs volumes as Not Resizeable.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Create a single or multiple device Btrfs file system.
2. Run installer, and select the option to get to the Reclaim Disk Space dialog.
Btrfs volumes are listed as Not Resizeable.
Btrfs volumes can be grown or shrunk since 2008. If anaconda isn't going to support this, then the column should read "Resize Unsupported" rather than stating the file system isn't resizable.
The bigger consequence of this bug, is that it's not possible to do back to back Guided Partitioning if Btrfs was used first and set to leave less than 6GB of unresizable space. Guided partitioning cannot proceed a 2nd time because there isn't enough space, and the installer presently lacks the ability to resize Btrfs volumes, or place /boot on Btrfs via Guided partitioning.
Because a btrfs volume can span multiple block devices of arbitrary type the installer is not going to support resizing of btrfs for the foreseeable future. The workaround available to you is to do the resize yourself. You can do it before starting the installer or you can do it while the installer is running, as long as you make sure to tell the installer to rescan the storage setup afterwards.
a.) "Not resizeable" is still incorrect in that it's untrue, and should be "Resize unsupported" or similar.
b.) Basically what you're saying is Guided partitioning isn't going to handle a side by side installation of a new version of Fedora along side the previous version if the file system is Btrfs. Whereas with ext4 this was possible.
It seems to me eventually something will have to give (resizing or /boot on Btrfs) before Btrfs as a file system can become a default; or the consequence is literally everyone will be relegated to using only Manual partitioning because Guided will be totally incapable of dealing with the situation.
(In reply to comment #3)
> a.) "Not resizeable" is still incorrect in that it's untrue, and should be
> "Resize unsupported" or similar.
Pedantic. It's not resizable in the installer.
> b.) Basically what you're saying is Guided partitioning isn't going to
> handle a side by side installation of a new version of Fedora along side the
> previous version if the file system is Btrfs. Whereas with ext4 this was
Correct, given some assumptions about available disk space, other partitions, &c.
> It seems to me eventually something will have to give (resizing or /boot on
> Btrfs) before Btrfs as a file system can become a default; or the
> consequence is literally everyone will be relegated to using only Manual
> partitioning because Guided will be totally incapable of dealing with the
Eventually, yes -- something will have to change. We only have so much time per release to spend on btrfs' specialness.
(In reply to comment #4)
> (In reply to comment #3)
> > a.) "Not resizeable" is still incorrect in that it's untrue, and should be
> > "Resize unsupported" or similar.
> Pedantic. It's not resizable in the installer.
It's not pedantic to be accurate. The present label implies the file system is not resizable more than it indicates an unwillingness by the installer. Resize unsupported more clearly attributes the limitation to the installer.
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Bugzilla just reminded me of this bug. I would like to go ahead and set expectations here. The installer team has no plans to work on BTRFS support in the foreseeable future. It is a low-priority area and there is a lot to be done elsewhere.
*** Bug 1327003 has been marked as a duplicate of this bug. ***