Bug 1215158

Summary:	reiserfs mount wrongly claims block device is read-only
Product:	[openSUSE] openSUSE Distribution	Reporter:	Joachim Wagner <jo4su>
Component:	Basesystem	Assignee:	Anthony Iliopoulos <ailiopoulos>
Status:	RESOLVED FIXED	QA Contact:	E-mail List <qa-bugs>
Severity:	Normal
Priority:	P5 - None	CC:	ailiopoulos
Version:	Leap 15.5
Target Milestone:	---
Hardware:	x86-64
OS:	openSUSE Leap 15.5
Whiteboard:
Found By:	---	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description Joachim Wagner 2023-09-08 09:53:31 UTC

User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0
Build Identifier: 

I created new reiserfs filesystems with mkfs.reiserfs 3.6.27 on a 931.51 GiB /dev/bcache3 device (with LUKS-encrypted /dev/sde1 as backing device) as well as a 117.19 GiB /dev/loop0 device (created with losetup --find --show from a sparse file on btrfs) and mount insists they are read-only.


Reproducible: Always

Steps to Reproduce:
1. select or create a block device for this test with reasonable size for the time when reiserfs was popular, e.g. 120 GB
2. create reiserfs on device
3. try to mount it
Actual Results:  
In both cases, mount reports

mount: /mnt/old: WARNING: source write-protected, mounted read-only.

The filesystem is read-only and cannot be remounted rw. Manually writing the the block device, e.g. /dev/loop0, and reading from it confirms that the block device can be written to and retains the written information.

Expected Results:  
The filesystem is mounted rw.

If this is a safety feature for a filesytem deemed obsolete, the error message should clarify this. 

mkfs.reiserfs 3.6.27
kernel 5.14.21-150500.55.19-default

Comment 1 Anthony Iliopoulos 2023-09-22 09:47:16 UTC

starting from SLE15 reiserfs has been unsupported:

https://www.suse.com/releasenotes/x86_64/SUSE-SLES/15/index.html#fate-323394

from dmesg when trying to mount a reiserfs partition:

> [   65.317809] reiserfs: read-write mode is unsupported.
> [   65.317812] reiserfs: load module with allow_unsupported=1 to enable read-write mode.

so you can do:

> echo Y > /sys/module/reiserfs/parameters/allow_unsupported

after which you will be able to mount the partition rw.