Re: btrfs mount options not used

[Jack Hill <jackhill@jackhill.us>]

On Thu, 20 Jun 2019, Jack Hill wrote:

> Hi Guix,
>
> I'm trying to mount my btrfs root filesystem with the compress=lzo option. 
> Following Section 8.3 or the manual (System Configuration → File Systems, I 
> added (options "compress=lzo") to my file system definition. However, when I 
> reconfigure and reboot, it does not appear that the file system is mounted 
> with this option. When I mount the filesystem manually with `mount -o 
> compress=lzo …` it works correctly. Full operating system config below. What 
> am I missing?
>
> Best,
> Jack
>
> from /proc/mounts:
> ```
> /dev/nvme0n1p2 / btrfs rw,relatime,ssd,space_cache,subvolid=5,subvol=/ 0 0
> /dev/nvme0n1p1 /boot/efi vfat 
> rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 
> 0 0
> ```

I forgot to mention: the gerated /etc/fstab looks correct


```
LABEL=lib-its13_nvme_btrfs	/	btrfs	compress=lzo 
LABEL=EFI	/boot/efi	vfat	defaults 
```

So that made me think that maybe the initramfs was the source of the 
problem, but that too looks correct. /gnu/store/<hash>-init in the 
initramfs looks fine as well:

```
(begin (use-modules (gnu build linux-boot)
 		    (gnu system file-systems)
 		    (guix build utils)
 		    (guix build bournish)
 		    (srfi srfi-26)
 		    ((gnu build file-systems) #:select (find-partition-by-luks-uuid))
 		    (rnrs bytevectors))
        (with-output-to-port (%make-void-port "w")
 	 (lambda ()
 	   (set-path-environment-variable "PATH"
 					  (quote ("bin" "sbin"))
 					  (quote ("/gnu/store/cxka7q519j6x26dqd2dv47vccbj7vmwd-btrfs-progs-static-5.1")))))
        (boot-system #:mounts (map spec->file-system
 				  (quote (((file-system-label "lib-its13_nvme_btrfs") "/"
 					   "btrfs"
 					   (no-atime)
 					   "compress=lzo"
 					   #t))))#:pre-mount
 					   (lambda ()
 					     (and))
 					   #:linux-modules (quote ("ahci" "usb-storage" "uas" "usbhid" "hid-generic"
 								   "hid-apple" "dm-crypt" "xts" "serpent_generic"
 								   "wp512" "nls_iso8859-1" "pata_acpi" "pata_atiixp"
 								   "isci" "virtio_pci" "virtio_balloon" "virtio_blk"
 								   "virtio_net" "virtio_console" "virtio-rng"
 								   "btrfs"))#:linux-module-directory
 								   (quote "/gnu/store/2ayjrg59m7kkjsbjp3akqz4sr467dd8j-linux-modules")
 								   #:keymap-file #f#:qemu-guest-networking? #f#:volatile-root? (quote #f)#:on-error
 								   (quote debug)))
```