Bcachefs - Revision history

Onny: /* NixOS installation on bcachefs */ Cleanup instruction

2025-12-09T13:27:47Z

NixOS installation on bcachefs: Cleanup instruction

← Older revision		Revision as of 13:27, 9 December 2025
Line 167:		Line 167:
	<syntaxhighlight lang="console">		<syntaxhighlight lang="console">
	# mkfs.fat -F 32 -n boot /dev/sda1		# mkfs.fat -F 32 -n boot /dev/sda1
	~~# nix-shell -p bcachefs-tools~~
	# mkfs.bcachefs -L nixos /dev/sda2		# mkfs.bcachefs -L nixos /dev/sda2
	</syntaxhighlight>		</syntaxhighlight>
Line 174:		Line 173:

	<syntaxhighlight lang="console">		<syntaxhighlight lang="console">
	# ~~nix-shell -p keyutils --run '~~keyctl link @u @s'		# keyctl link @u @s
	# ~~nix-shell~~ -~~p bcachefs~~-~~tools~~		# bcachefs format --label=nixos --encrypted /dev/sda2
	~~# bcachefs format~~ --encrypted /dev/sda2
	# bcachefs unlock /dev/sda2		# bcachefs unlock /dev/sda2
	</syntaxhighlight>		</syntaxhighlight>

	Mount filesystems		Mount filesystems. Use <code>lsblk -o +uuid,fsType \| grep bcachefs</code> to get bcachefs partition uuid.

	~~There are two ways~~ to ~~mount a~~ bcachefs ~~filesystem~~. ~~First, by device:~~

	<syntaxhighlight lang="console">		<syntaxhighlight lang="console">
	# mount /dev/~~sda2~~ /mnt		# mount /dev/disk/by-uuid/<...> /mnt
	# mkdir /mnt/boot		# mkdir /mnt/boot
	# mount /dev/disk/by-label/boot /mnt/boot		# mount /dev/disk/by-label/boot /mnt/boot
	</syntaxhighlight>		</syntaxhighlight>

	~~For better reliability as with any other filesystem, one should mount the filesystem by UUID, by replacing any drive specifiers with it.~~
	~~When you formatted, there was an external UUID shown, but if you lost it, you can retrieve it using~~
	~~<syntaxhighlight lang="console">~~
	~~# lsblk -o +uuid,fsType \| grep bcachefs~~
	~~</syntaxhighlight>~~
	~~And using it like <code>UUID=<UUID></code> in place of <code>/dev/sda1:/dev/sdb1</code> or even just <code>/dev/sda</code>.~~

	Continue installation as recommended by the [https://nixos.org/manual/nixos/stable/index.html#ch-installation NixOS manual].		Continue installation as recommended by the [https://nixos.org/manual/nixos/stable/index.html#ch-installation NixOS manual].

Onny: /* Generate bcachefs enabled installation media */

2025-12-09T13:24:22Z

Generate bcachefs enabled installation media

← Older revision		Revision as of 13:24, 9 December 2025
Line 131:		Line 131:
	"${nixos}/nixos/modules/installer/cd-dvd/installation-cd-minimal-new-kernel-no-zfs.nix"		"${nixos}/nixos/modules/installer/cd-dvd/installation-cd-minimal-new-kernel-no-zfs.nix"
	({ lib, pkgs, ... }: {		({ lib, pkgs, ... }: {
			# Required as a workaround for bug
			# https://github.com/NixOS/nixpkgs/issues/32279
			environment.systemPackages = [ pkgs.keyutils ];
	boot.supportedFilesystems = [ "bcachefs" ];		boot.supportedFilesystems = [ "bcachefs" ];
	})		})

Onny: /* Generate bcachefs enabled installation media */

2025-12-09T13:07:33Z

Generate bcachefs enabled installation media

← Older revision		Revision as of 13:07, 9 December 2025
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	The following commands will generate the iso-image which will be available in the directory <code>./result/iso</code>		The following commands will generate the iso-image which will be available in the directory <code>./result/iso</code>

	<syntaxhighlight lang="console">		<syntaxhighlight lang="console"># nix build .#nixosConfigurations.exampleIso.config.system.build.isoImage
	# nix build .#nixosConfigurations.exampleIso.config.system.build.isoImage
	</syntaxhighlight>		</syntaxhighlight>

Onny: /* Tips and tricks */ Add instruction to build bcachefs enabled installation media

2025-12-09T13:06:58Z

Tips and tricks: Add instruction to build bcachefs enabled installation media

← Older revision		Revision as of 13:06, 9 December 2025
Line 113:		Line 113:

	== Tips and tricks ==		== Tips and tricks ==


			=== Generate bcachefs enabled installation media ===

			Use following Nix [[Flakes\|Flake-expression]] to generate a ISO installation image with a bcachefs enabled kernel

			{{file\|flake.nix\|nix\|<nowiki>
			{
			description = "Bcachefs enabled installation media";
			inputs.nixos.url = "nixpkgs/nixos-25.11";

			outputs = { self, nixos }: {
			nixosConfigurations = {
			exampleIso = nixos.lib.nixosSystem {
			system = "x86_64-linux";
			modules = [
			"${nixos}/nixos/modules/installer/cd-dvd/installation-cd-minimal-new-kernel-no-zfs.nix"
			({ lib, pkgs, ... }: {
			boot.supportedFilesystems = [ "bcachefs" ];
			})
			];
			};
			};
			};
			}
			</nowiki>}}

			The following commands will generate the iso-image which will be available in the directory <code>./result/iso</code>

			<syntaxhighlight lang="console">
			# nix build .#nixosConfigurations.exampleIso.config.system.build.isoImage
			</syntaxhighlight>

	=== NixOS installation on bcachefs ===		=== NixOS installation on bcachefs ===

Onny: /* NixOS installation on bcachefs */ Fix correct command usage

2025-12-09T13:04:38Z

NixOS installation on bcachefs: Fix correct command usage

← Older revision		Revision as of 13:04, 9 December 2025
Line 133:		Line 133:
	<syntaxhighlight lang="console">		<syntaxhighlight lang="console">
	# mkfs.fat -F 32 -n boot /dev/sda1		# mkfs.fat -F 32 -n boot /dev/sda1
	# nix shell -p bcachefs-tools		# nix-shell -p bcachefs-tools
	# mkfs.bcachefs -L nixos /dev/sda2		# mkfs.bcachefs -L nixos /dev/sda2
	</syntaxhighlight>		</syntaxhighlight>

Console4852: github issue referenced in wiki is now fixed, so remove note.

2025-09-30T06:51:42Z

github issue referenced in wiki is now fixed, so remove note.

← Older revision		Revision as of 06:51, 30 September 2025
Line 162:		Line 162:
	</syntaxhighlight>		</syntaxhighlight>
	And using it like <code>UUID=<UUID></code> in place of <code>/dev/sda1:/dev/sdb1</code> or even just <code>/dev/sda</code>.		And using it like <code>UUID=<UUID></code> in place of <code>/dev/sda1:/dev/sdb1</code> or even just <code>/dev/sda</code>.

	Note: this is currently broken as per this [https://github.com/NixOS/nixpkgs/issues/317901 github issue]. As a workaround, use `/dev/disk/by-uuid/<UUID>` or `/dev/disk/by-id` instead. This seems to work for single device systems atleast, although atleast at the time of this writing I could not get it to work on my 4+ device raid system.

	Continue installation as recommended by the [https://nixos.org/manual/nixos/stable/index.html#ch-installation NixOS manual].		Continue installation as recommended by the [https://nixos.org/manual/nixos/stable/index.html#ch-installation NixOS manual].

Kiri: added missing newline escape to shell command examples

2025-06-04T03:27:57Z

added missing newline escape to shell command examples

← Older revision		Revision as of 03:27, 4 June 2025
Line 57:		Line 57:
	--label=hdd.hdd3 /dev/sde \		--label=hdd.hdd3 /dev/sde \
	--label=ssd.ssd1 /dev/sdf \		--label=ssd.ssd1 /dev/sdf \
	--label=ssd.ssd2 /dev/sdg		--label=ssd.ssd2 /dev/sdg \
	--foreground_target=ssd \		--foreground_target=ssd \
	--promote_target=ssd \		--promote_target=ssd \
Line 71:		Line 71:
	--label=hdd.hdd3 /dev/sde \		--label=hdd.hdd3 /dev/sde \
	--label=ssd.ssd1 /dev/sdf \		--label=ssd.ssd1 /dev/sdf \
	--label=ssd.ssd2 /dev/sdg		--label=ssd.ssd2 /dev/sdg \
	--foreground_target=ssd \		--foreground_target=ssd \
	--promote_target=ssd \		--promote_target=ssd \

Onny: Update page for NixOS 25.05. Release contains a kernel with bcachefs now

2025-05-31T14:56:15Z

Update page for NixOS 25.05. Release contains a kernel with bcachefs now

@@ Line 113: / Line 113: @@
 == Tips and tricks ==
 === NixOS installation on bcachefs ===
@@ Line 166: / Line 133: @@
 <syntaxhighlight lang="console">
 # mkfs.fat -F 32 -n boot /dev/sda1
 # mkfs.bcachefs -L nixos /dev/sda2
 </syntaxhighlight>
@@ Line 173: / Line 141: @@
 <syntaxhighlight lang="console">
 # nix-shell -p keyutils --run 'keyctl link @u @s'
 # bcachefs format --encrypted /dev/sda2
 # bcachefs unlock /dev/sda2
@@ Line 197: / Line 166: @@
 Continue installation as recommended by the [https://nixos.org/manual/nixos/stable/index.html#ch-installation NixOS manual].
 === Remote encrypted disk unlocking ===

Muhlinux: Citation needed. Especially regarding stability compared to ZFS

2025-01-28T13:09:26Z

Citation needed. Especially regarding stability compared to ZFS

← Older revision		Revision as of 13:09, 28 January 2025
Line 1:		Line 1:
	[https://bcachefs.org Bcachefs] is a next-generation CoW filesystem that aims to provide features from [[Btrfs]] and [[ZFS]] with a cleaner codebase, more stability, greater speed and a GPL-compatible license. It is built upon Bcache and is mainly developed by Kent Overstreet.		[https://bcachefs.org Bcachefs] is a next-generation CoW filesystem that aims to provide features from [[Btrfs]] and [[ZFS]] with a cleaner codebase<ref name=":0">citation needed</ref>, more stability<ref name=":0" />, greater speed<ref name=":0" /> and a GPL-compatible license. It is built upon Bcache and is mainly developed by Kent Overstreet.

	== Installation ==		== Installation ==

Onny: /* Automatically mount encrypted device on boot */

2025-01-28T11:57:14Z

Automatically mount encrypted device on boot

← Older revision		Revision as of 11:57, 28 January 2025
Line 213:		Line 213:
	after = [ "local-fs.target" ];		after = [ "local-fs.target" ];
	wantedBy = [ "multi-user.target" ];		wantedBy = [ "multi-user.target" ];
			environment = {
			DEVICE_PATH = "/dev/sda1";
			MOUNT_POINT = "/mnt";
			};
	script = ''		script = ''
	#!${pkgs.runtimeShell} -e		#!${pkgs.runtimeShell} -e

	${pkgs.keyutils}/bin/keyctl link @u @s		${pkgs.keyutils}/bin/keyctl link @u @s
	~~while~~ [ ! -b /~~dev~~/~~sda1~~ ]; do
	echo "Waiting for ~~/dev/sda1~~ to become available..."		# Check if the device path exists
			if [ ! -b "$DEVICE_PATH" ]; then
			echo "Error: Device path $DEVICE_PATH does not exist."
			exit 1
			fi

			# Check if the drive is already mounted
			if ${pkgs.util-linux}/bin/mountpoint -q "$MOUNT_POINT"; then
			echo "Drive already mounted at $MOUNT_POINT. Skipping..."
			exit 0
			fi

			# Wait for the device to become available
			while [ ! -b "$DEVICE_PATH" ]; do
			echo "Waiting for $DEVICE_PATH to become available..."
	sleep 5		sleep 5
	done		done
	${pkgs.bcachefs-tools}/bin/bcachefs mount -f /etc/keyfile_test ~~/dev/sda1 /mnt~~
			# Mount the device
			${pkgs.bcachefs-tools}/bin/bcachefs mount -f /etc/keyfile_test "$DEVICE_PATH" "$MOUNT_POINT"
	'';		'';
	serviceConfig = {		serviceConfig = {