You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
210 lines
7.0 KiB
210 lines
7.0 KiB
From 9282e1169f19676553a82dd49f780285a16e3b9a Mon Sep 17 00:00:00 2001
|
|
From: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
|
|
Date: Fri, 23 Feb 2024 15:51:45 +0100
|
|
Subject: [PATCH 18/41] mdadm: remove mkinitramfs stuff
|
|
|
|
This script uses mdadm.static which is known to not be abandoned
|
|
(probably not working) from years. Mdadm is integrated with dracut
|
|
and mkinitramfs these days.
|
|
|
|
Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
|
|
---
|
|
README.initramfs | 122 -----------------------------------------------
|
|
mkinitramfs | 55 ---------------------
|
|
2 files changed, 177 deletions(-)
|
|
delete mode 100644 README.initramfs
|
|
delete mode 100644 mkinitramfs
|
|
|
|
diff --git a/README.initramfs b/README.initramfs
|
|
deleted file mode 100644
|
|
index c5fa6680..00000000
|
|
--- a/README.initramfs
|
|
+++ /dev/null
|
|
@@ -1,122 +0,0 @@
|
|
-Assembling md arrays at boot time.
|
|
----------------------------------
|
|
-December 2005
|
|
-
|
|
-These notes apply to 2.6 kernels only and, in some cases,
|
|
-to 2.6.15 or later.
|
|
-
|
|
-Md arrays can be assembled at boot time using the 'autodetect' functionality
|
|
-which is triggered by storing components of an array in partitions of type
|
|
-'fd' - Linux Raid Autodetect.
|
|
-They can also be assembled by specifying the component devices in a
|
|
-kernel parameter such as
|
|
- md=0,/dev/sda,/dev/sdb
|
|
-In this case, /dev/md0 will be assembled (because of the 0) from the listed
|
|
-devices.
|
|
-
|
|
-These mechanisms, while useful, do not provide complete functionality
|
|
-and are unlikely to be extended. The preferred way to assemble md
|
|
-arrays at boot time is using 'mdadm'. To assemble an array which
|
|
-contains the root filesystem, mdadm needs to be run before that
|
|
-filesystem is mounted, and so needs to be run from an initial-ram-fs.
|
|
-It is how this can work that is the primary focus of this document.
|
|
-
|
|
-It should be noted up front that only the array containing the root
|
|
-filesystem should be assembled from the initramfs. Any other arrays
|
|
-should be assembled under the control of files on the main filesystem
|
|
-as this enhanced flexibility and maintainability.
|
|
-
|
|
-A minimal initramfs for assembling md arrays can be created using 3
|
|
-files and one directory. These are:
|
|
-
|
|
-/bin Directory
|
|
-/bin/mdadm statically linked mdadm binary
|
|
-/bin/busybox statically linked busybox binary
|
|
-/bin/sh hard link to /bin/busybox
|
|
-/init a shell script which call mdadm appropriately.
|
|
-
|
|
-An example init script is:
|
|
-
|
|
-==============================================
|
|
-#!/bin/sh
|
|
-
|
|
-echo 'Auto-assembling boot md array'
|
|
-mkdir /proc
|
|
-mount -t proc proc /proc
|
|
-if [ -n "$rootuuid" ]
|
|
-then arg=--uuid=$rootuuid
|
|
-elif [ -n "$mdminor" ]
|
|
-then arg=--super-minor=$mdminor
|
|
-else arg=--super-minor=0
|
|
-fi
|
|
-echo "Using $arg"
|
|
-mdadm -Acpartitions $arg --auto=part /dev/mda
|
|
-cd /
|
|
-mount /dev/mda1 /root || mount /dev/mda /root
|
|
-umount /proc
|
|
-cd /root
|
|
-exec chroot . /sbin/init < /dev/console > /dev/console 2>&1
|
|
-=============================================
|
|
-
|
|
-This could certainly be extended, or merged into a larger init script.
|
|
-Though tested and in production use, it is not presented here as
|
|
-"The Right Way" to do it, but as a useful example.
|
|
-Some key points are:
|
|
-
|
|
- /proc needs to be mounted so that /proc/partitions can be accessed
|
|
- by mdadm, and so that /proc/filesystems can be accessed by mount.
|
|
-
|
|
- The uuid of the array can be passed in as a kernel parameter
|
|
- (rootuuid). As the kernel doesn't use this value, it is made available
|
|
- in the environment for /init
|
|
-
|
|
- If no uuid is given, we default to md0, (--super-minor=0) which is a
|
|
- commonly used to store the root filesystem. This may not work in
|
|
- all situations.
|
|
-
|
|
- We assemble the array as a partitionable array (/dev/mda) even if we
|
|
- end up using the whole array. There is no cost in using the partitionable
|
|
- interface, and in this context it is simpler.
|
|
-
|
|
- We try mounting both /dev/mda1 and /dev/mda as they are the most like
|
|
- part of the array to contain the root filesystem.
|
|
-
|
|
- The --auto flag is given to mdadm so that it will create /dev/md*
|
|
- files automatically. This is needed as /dev will not contain
|
|
- and md files, and udev will not create them (as udev only created device
|
|
- files after the device exists, and mdadm need the device file to create
|
|
- the device). Note that the created md files may not exist in /dev
|
|
- of the mounted root filesystem. This needs to be deal with separately
|
|
- from mdadm - possibly using udev.
|
|
-
|
|
- We do not need to create device files for the components which will
|
|
- be assembled into /dev/mda. mdadm finds the major/minor numbers from
|
|
- /proc/partitions and creates a temporary /dev file if one doesn't already
|
|
- exist.
|
|
-
|
|
-The script "mkinitramfs" which is included with the mdadm distribution
|
|
-can be used to create a minimal initramfs. It creates a file called
|
|
-'init.cpio.gz' which can be specified as an 'initrd' to lilo or grub
|
|
-(or whatever boot loader is being used).
|
|
-
|
|
-
|
|
-
|
|
-
|
|
-Resume from an md array
|
|
------------------------
|
|
-
|
|
-If you want to make use of the suspend-to-disk/resume functionality in Linux,
|
|
-and want to have swap on an md array, you will need to assemble the array
|
|
-before resume is possible.
|
|
-However, because the array is active in the resumed image, you do not want
|
|
-anything written to any drives during the resume process, such as superblock
|
|
-updates or array resync.
|
|
-
|
|
-This can be achieved in 2.6.15-rc1 and later kernels using the
|
|
-'start_readonly' module parameter.
|
|
-Simply include the command
|
|
- echo 1 > /sys/module/md_mod/parameters/start_ro
|
|
-before assembling the array with 'mdadm'.
|
|
-You can then echo
|
|
- 9:0
|
|
-or whatever is appropriate to /sys/power/resume to trigger the resume.
|
|
diff --git a/mkinitramfs b/mkinitramfs
|
|
deleted file mode 100644
|
|
index c6275ddb..00000000
|
|
--- a/mkinitramfs
|
|
+++ /dev/null
|
|
@@ -1,55 +0,0 @@
|
|
-#!/bin/sh
|
|
-
|
|
-# make sure we are being run in the right directory...
|
|
-if [ -f mkinitramfs ]
|
|
-then :
|
|
-else
|
|
- echo >&2 mkinitramfs must be run from the mdadm source directory.
|
|
- exit 1
|
|
-fi
|
|
-if [ -f /bin/busybox ]
|
|
-then : good, it exists
|
|
- case `file /bin/busybox` in
|
|
- *statically* ) : good ;;
|
|
- * ) echo >&2 mkinitramfs: /bin/busybox is not statically linked: cannot proceed.
|
|
- exit 1
|
|
- esac
|
|
-else
|
|
- echo >&2 "mkinitramfs: /bin/busybox doesn't exist - please install it statically linked."
|
|
- exit 1
|
|
-fi
|
|
-
|
|
-rm -rf initramfs
|
|
-mkdir initramfs
|
|
-mkdir initramfs/bin
|
|
-make mdadm.static
|
|
-cp mdadm.static initramfs/bin/mdadm
|
|
-cp /bin/busybox initramfs/bin/busybox
|
|
-ln initramfs/bin/busybox initramfs/bin/sh
|
|
-cat <<- END > initramfs/init
|
|
- #!/bin/sh
|
|
-
|
|
- echo 'Auto-assembling boot md array'
|
|
- mkdir /proc
|
|
- mount -t proc proc /proc
|
|
- if [ -n "$rootuuid" ]
|
|
- then arg=--uuid=$rootuuid
|
|
- elif [ -n "$mdminor" ]
|
|
- then arg=--super-minor=$mdminor
|
|
- else arg=--super-minor=0
|
|
- fi
|
|
- echo "Using $arg"
|
|
- mdadm -Acpartitions $arg --auto=part /dev/mda
|
|
- cd /
|
|
- mount /dev/mda1 /root || mount /dev/mda /root
|
|
- umount /proc
|
|
- cd /root
|
|
- exec chroot . /sbin/init < /dev/console > /dev/console 2>&1
|
|
-END
|
|
-chmod +x initramfs/init
|
|
-
|
|
-(cd initramfs
|
|
- find init bin | cpio -o -H newc | gzip --best
|
|
-) > init.cpio.gz
|
|
-rm -rf initramfs
|
|
-ls -l init.cpio.gz
|
|
--
|
|
2.40.1
|
|
|