linux-kernel - Multidevice f2fs mount after disk rearrangement

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Message-ID: <4c6cf8418236145f7124ac61eb2908ad@natalenko.name>
Date:   Sat, 04 Jan 2020 17:29:31 +0100
From:   Oleksandr Natalenko <oleksandr@...alenko.name>
To:     linux-f2fs-devel@...ts.sourceforge.net
Cc:     linux-kernel@...r.kernel.org, Jaegeuk Kim <jaegeuk@...nel.org>,
        Chao Yu <chao@...nel.org>
Subject: Multidevice f2fs mount after disk rearrangement

Hello.

I was brave enough to create f2fs filesystem spanning through 2 physical 
device using this command:

# mkfs.f2fs -t 0 /dev/sdc -c /dev/sdd

It worked fine until I removed /dev/sdb from my system, so f2fs devices 
became:

/dev/sdc -> /dev/sdb
/dev/sdd -> /dev/sdc

Now, when I try to mount it, I get the following:

# mount -t f2fs /dev/sdb /mnt/fs
mount: /mnt/fs: mount(2) system call failed: No such file or directory.

In dmesg:

[Jan 4 17:25] F2FS-fs (sdb): Mount Device [ 0]:             /dev/sdc,    
59063,        0 -  1cd6fff
[  +0,000024] F2FS-fs (sdb): Failed to find devices

fsck also fails with the following assertion:

[ASSERT] (init_sb_info: 908) !strcmp((char *)sb->devs[i].path, (char 
*)c.devices[i].path)

Am I doing something obviously stupid, and the device path can be 
(somehow) changed so that the mount succeeds, or this is unfixable, and 
f2fs relies on persistent device naming?

Please suggest.

Thank you.

-- 
   Oleksandr Natalenko (post-factum)