User:Pietinger/temp/test

Hi @xarvatium,

Update 2024-02-25: I will wait until kernel version 6.9 because of this: https://www.phoronix.com/news/Bcachefs-Disk-Account-Rewrite

Update 2024-05-19: I will wait until kernel version 6.10 because of this: https://www.phoronix.com/news/Linux-6.10-Bcachefs

Update 2024-08-18: I will wait until kernel version 6.11 because of this: https://www.phoronix.com/news/Bcachefs-Merge-Linux-6.11-rc4

Links

• User:Xarvatium/Bcachefs_rootfs
• encrypted bcachefs root partition [[1]]

Old

I am highly interested in a bcachefs-solution for the root partition with two SSDs as RAID-1 (and with encryption).

[- Deleted old stuff -]

A working solution was presented in our Gentoo forum (link above).

Jumping in as I'm interested in this too

This looks like it should work, I'll chuck it in a VM as I want to the hook at https://github.com/breavyn/dracut-bcachefs/tree/master for encryption and there is maybe a chance we can hack that to let booting work until grub gets bcachefs support.

Immolo (talk) 01:56, 13 January 2024 (UTC)

Hi @immolo, great you are in !

Preliminary test: What happens if a hard disk of a (encrypted) bcache RAID1 fails ?

I have formatted two unused partitions with bcachefs:

# bcachefs format /dev/sda1 /dev/sda2 --replicas=2 --encrypt --wide_macs --acl --verbose
Enter passphrase: 
Enter same passphrase again:
# mkdir /mnt/bc

After this I had this problem:

# mount.bcachefs /dev/sda1:/dev/sda2 /mnt/bc
ERROR - bcachefs_rust::cmd_mount: Fatal error: Required key not available

I found this: https://lore.kernel.org/all/12360099.O9o76ZdvQC@lichtvoll.de/T/ and did it:

# keyctl link @u @s
# mount.bcachefs /dev/sda1:/dev/sda2 /mnt/bc

Now it worked. I copied a file into it and made a subvolume:

 /mnt/bc # bcachefs subvolume create /mnt/bc/etc
 /mnt/bc # lal
insgesamt 8
drwxr-xr-x 3 root root    0 19. Jan 20:59 .
drwxr-xr-x 6 root root 4096 19. Jan 20:42 ..
-rw-r--r-- 1 root root  342 19. Jan 20:58 BCACHEFS.txt
drwxr-xr-x 2 root root    0 19. Jan 20:59 etc
drwx------ 2 root root    0 19. Jan 20:56 lost+found

THEN I destoyed /dev/sda1

# cd
# umount /mnt/bc/
# mkfs.ext4 /dev/sda1

NOW: Can I mount /dev/sda2 ... and HOW ?

# mount.bcachefs /dev/sda1:/dev/sda2 /mnt/bc
bcachefs (/dev/sda1): error reading default superblock: Not a bcachefs superblock
bcachefs (/dev/sda1): error reading superblock: Not a bcachefs superblock layout
ERROR - bcachefs_rust::cmd_mount: Fatal error: "invalid_sb_layout"

NOPE

# mount.bcachefs -o degraded /dev/sda1:/dev/sda2 /mnt/bc
bcachefs (/dev/sda1): error reading default superblock: Not a bcachefs superblock
bcachefs (/dev/sda1): error reading superblock: Not a bcachefs superblock layout
ERROR - bcachefs_rust::cmd_mount: Fatal error: "invalid_sb_layout"

NOPE

# mount.bcachefs /dev/sda2 /mnt/bc
ERROR - bcachefs_rust::cmd_mount: Fatal error: Invalid argument

NOPE

# mount.bcachefs -o degraded /dev/sda2 /mnt/bc
# cd /mnt/bc
/mnt/bc # lal
insgesamt 8
drwxr-xr-x 3 root root    0 19. Jan 20:59 .
drwxr-xr-x 6 root root 4096 19. Jan 20:42 ..
-rw-r--r-- 1 root root  342 19. Jan 20:58 BCACHEFS.txt
drwxr-xr-x 2 root root    0 19. Jan 20:59 etc
drwx------ 2 root root    0 19. Jan 20:56 lost+found

Aaahh ... :-) ... AND ... there is no second question for my password ... SO ... How do I programm it in my init-file of my initramfs ? Before I will try it on my test partitions:

# nano test.sh
=>
#!/bin/sh

### CHANGE THIS !
myrootpartition="/dev/sda1:/dev/sda2"

abend() {
    echo "$@"
    echo "You are now in a rescue shell."
    busybox --install -s
    exec /bin/sh
}

third_try() {
    echo "There was again a problem. Trying last chance !"
    /sbin/mount.bcachefs -o degraded /dev/sda2 /mnt/bc
    exit
}

second_try() {
    echo "There was a problem. Trying something different !"
    /sbin/mount.bcachefs -o degraded /dev/sda1 /mnt/bc || third_try
    exit
}

#echo "Mounting proc, sys, and devtmpfs ..."
#mount -t devtmpfs none /dev || abend "Error: mount /devtmpfs failed !"
#mount -t proc none /proc || abend "Error: mount /proc failed !"
#mount -t sysfs none /sys || abend "Error: mount /sysfs failed !"

echo "Mounting root partition ..."
/sbin/mount.bcachefs $myrootpartition /mnt/bc || second_try

#echo "Unmounting proc, sys, and devtmpfs ..."
#umount /proc /sys /dev
<=

You see, this is NOT a busybox-script ... you have to change something ;-) Giving it a +x and run it

# ./test.sh 
Mounting root partition ...
bcachefs (/dev/sda1): error reading default superblock: Not a bcachefs superblock
bcachefs (/dev/sda1): error reading superblock: Not a bcachefs superblock layout
ERROR - bcachefs_rust::cmd_mount: Fatal error: "invalid_sb_layout"
There was a problem. Trying something different !
bcachefs (/dev/sda1): error reading default superblock: Not a bcachefs superblock
bcachefs (/dev/sda1): error reading superblock: Not a bcachefs superblock layout
ERROR - bcachefs_rust::cmd_mount: Fatal error: "invalid_sb_layout"
There was again a problem. Trying last chance !
 ~ # 
 ~ # cd /mnt/bc/
 /mnt/bc # ll
insgesamt 4
-rw-r--r-- 1 root root 342 19. Jan 20:58 BCACHEFS.txt
drwxr-xr-x 2 root root   0 19. Jan 20:59 etc
drwx------ 2 root root   0 19. Jan 20:56 lost+found

Okay ... now the last problem: This does not look very nice (Maybe some programmers are dying now ...). For now it was only an alpha test ...