Device Mapper and -fallback.img - stock, ck and beyond

Hi!
I have similar findings to superstoned, see at the end of
http://bbs.archlinux.org/viewtopic.php?t=27696
device mapper module is not the part of the kernel26*-fallback.img. I understand the fallback images as the ones that contain all modules and if we get into trouble by generating our own cpio image we can point GRUB/LILO to them and be able to fix the problems.
Unfortunatelly the device mapper is not included in them (I checked the stock, ck and beyond kernels) which can cause problems if somebody installs the "/" on LVM managed disks.
Would it make sense to include them in the "fallback" image?
Besides of that I created a custom cpio image that includes the dm_mod.k by putting it into mkinitcpio.conf
MODULES="sata_nv sd_mod reiserfs dm_mod"
funny thing is it is working fine for the beyond and ck kernels but the stock one is not loading it although it is there - in the img file. Weird.
Any comments?
waldek

I checked again - custom img file works for all 3 kernels. My mistake - sorry.

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[Abandoned] device-mapper/dm-crypt/luks without initramfs

Hi everyone,
i attempted to compile a custom kernel to reduce the my EEE 1000H's boot time by compiling everything i need statically, which seems to work well, except one thing: Accessing my encrypted root partition. I created it by following the wiki and all is well if i boot "normally" (using an initramfs and the encrypt hook).
So i tried to compile the modules necessary to boot encrypted partitions into the kernel. The options i changed to achieve this were
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CONFIG_DM_CRYPT=y
CONFIG_CRYPTO_AES=y
CONFIG_CRYPTO_AES_586=y
in my kernel config (along with all the other stuff of course). All the
The i tried to boot the new kernel via GRUB using just
title Test
root (hd0,0)
kernel /vmlinuz-2.6.30-rc8-eee1000h-kms root=dev/sda3 i915.modeset=1 ro 3
but it panics
sd 0:0:0:0: [sda] Attached SCSI disk
UDF-fs: No partition found (1)
List of all partitions:
0800 156290904 sda driver: sd
0801 497983 sda1 #the unencrypted /boot
0802 2000092 sda2 #swap
0803 153790245 sda3 #root, ext3 fs
No filesystem could mount root, tried: ext3 ext2 iso9660 udf
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,3)
altough it does this in my monitor's native resolution . The kernel seems to try to access the encrypted partition directly and the device mapper doesn't seem to be active.
I guess this is because the script in
/lib/initcpio/hooks/encrypt
seems to handle unlocking the volume and activating the device mapper and it's obviously missing now. I think i would have to rewrite it to not use modules - but this is far beyond my abilites.
I haven't found any further information on this issue either, it just doesn't seem to be possible, or rather, advisable to encrypt your root partition while not using an initramfs. I guess i'll have to use one or just encrypt only my user's home directory, or does anyone have an idea on how to solve this problem?
Update: I gave up on this.
Last edited by Malstrond (2009-08-13 20:20:03)

Hi everyone,
i attempted to compile a custom kernel to reduce the my EEE 1000H's boot time by compiling everything i need statically, which seems to work well, except one thing: Accessing my encrypted root partition. I created it by following the wiki and all is well if i boot "normally" (using an initramfs and the encrypt hook).
So i tried to compile the modules necessary to boot encrypted partitions into the kernel. The options i changed to achieve this were
CONFIG_BLK_DEV_DM=y
CONFIG_DM_CRYPT=y
CONFIG_CRYPTO_AES=y
CONFIG_CRYPTO_AES_586=y
in my kernel config (along with all the other stuff of course). All the
The i tried to boot the new kernel via GRUB using just
title Test
root (hd0,0)
kernel /vmlinuz-2.6.30-rc8-eee1000h-kms root=dev/sda3 i915.modeset=1 ro 3
but it panics
sd 0:0:0:0: [sda] Attached SCSI disk
UDF-fs: No partition found (1)
List of all partitions:
0800 156290904 sda driver: sd
0801 497983 sda1 #the unencrypted /boot
0802 2000092 sda2 #swap
0803 153790245 sda3 #root, ext3 fs
No filesystem could mount root, tried: ext3 ext2 iso9660 udf
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,3)
altough it does this in my monitor's native resolution . The kernel seems to try to access the encrypted partition directly and the device mapper doesn't seem to be active.
I guess this is because the script in
/lib/initcpio/hooks/encrypt
seems to handle unlocking the volume and activating the device mapper and it's obviously missing now. I think i would have to rewrite it to not use modules - but this is far beyond my abilites.
I haven't found any further information on this issue either, it just doesn't seem to be possible, or rather, advisable to encrypt your root partition while not using an initramfs. I guess i'll have to use one or just encrypt only my user's home directory, or does anyone have an idea on how to solve this problem?
Update: I gave up on this.
Last edited by Malstrond (2009-08-13 20:20:03)

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I learned from a previous thread here that BtrFS should not be put on a LVM volume as both provide similar technologies that compete with each other. What about Device Mapper (DM) and BtrFS under Oracle Linux 6.3? I guess both share similar technologies as well, like Snapshot. Albeit DM is probably less sophisticated. However, I was wondering whether BtrFS and Device Mapper should be used together.
According to https://www.suse.com/documentation/sles11/singlehtml/stor_admin/stor_admin.html. +"You can create BtrFS on Multiple Devices (MD) and Device Mapper (DM) storage configurations by using the YaST2 Partitioner."+ So this tells me that DM and BtrFS can be used together. And I guess one example might be disk encryption using cryptsetup, which uses device mapper. Is this correct?
If I'm not mistaken, then Device Mapper support is in the Linux 2.6 kernel, and /dev/mapper devices are typcially setup by LVM and cryptsetup, but I can also create them using dmsetup. Let's say I have e.g. /dev/sda2 and I want to map it to a DM virtual device named root, then initialize it using BtrFS:
<pre>
dmsetup create root table "0 $(blockdev getsz /dev/sda2) linear /dev/sda2 0"
mkfs.btrfs /dev/mapper/root
</pre>
The command works, but I might doing something wrong, because /dev/mapper/root does not survive a system restart. Unfortunately I have not found anything useful about it in Google yet. Anyway, does this make any sense?
Thanks!

I was actually aware of Multipath, but wasn't aware until recently that DM-Crypt, DM-Multipath and LVM2 are all using the same type of Device Mapper function that is provided by the kernel. That's probably why it's called DM Multipath ;-)
Apparently the system startup of any such physical to virtual mapped devices is a challenge for the boot process. The system BIOS or adapter firmware does not understand nor generate any of the special devices that Linux consruct and requires by software. Hence the business of initrd and initramfs, which are mini startup systems to provide the necessary drivers to find peripheral or to create the Linux devices and environment.
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Edited by: Dude on Oct 8, 2012 6:17 PM

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Device Mapper and -fallback.img - stock, ck and beyond

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