Bug 303531

Summary:	PATCH: genkernel should support detection of multiple devices as root
Product:	Gentoo Linux	Reporter:	devsk <funtoos>
Component:	New packages	Assignee:	Gentoo Genkernel Maintainers <genkernel>
Status:	RESOLVED FIXED
Severity:	normal	CC:	paul, sping, ziga.boehm
Priority:	High	Keywords:	InVCS
Version:	2008.0
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---
Bug Depends on:
Bug Blocks:	351772
Attachments:	Support multiple root device returned from blkid

Description devsk 2010-02-05 04:03:21 UTC

Currently, if blkid returns multiple devices for root based on LABEL (LABEL=abc is a valid input for real_root), genkernel code gets confused and concludes there is no root available. Some RAID0 volumes do return both the participants in RAID0 as the root device. The attached patch makes sure that the genkernel does break in this scenario.

Comment 1 devsk 2010-02-05 04:03:58 UTC

Created attachment 218479 [details, diff]
Support multiple root device returned from blkid

Comment 2 devsk 2010-08-01 17:15:40 UTC

What's up folks? 6months and no action. "Patches just lie there and nobody pays attention" = "signs of a dead project!"

Comment 3 Andreas Aronsson 2010-12-21 21:51:53 UTC

Still no news? Seems good this patch.

Comment 4 Sebastian Pipping gentoo-dev

2011-01-05 23:03:26 UTC

PS: Adding keyword "Inclusion" to better show this bug's nature in searches...

Comment 5 Sebastian Pipping gentoo-dev

2011-01-11 12:27:16 UTC

I have applied your patch after some local experiments.
Emerge genkernel-99999 (five nines) to get it to your system.

This is the testing I did:
====================================================
# mkdir raid-0-test

# cd raid-0-test

# for i in one two ; do touch $i ; truncate --size $((1024*1024*100)) $i ; sudo losetup -f $i ; done

# sudo losetup -a
/dev/loop0: [fe06]:4337414 ([..]/raid-0-test/one)
/dev/loop1: [fe06]:4337415 ([..]/raid-0-test/two)

# sudo mdadm --create /dev/md0 --level=0 --raid-devices=2 --assume-clean /dev/loop0 /dev/loop1
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.

# sudo /sbin/blkid | fgrep /dev/loop
/dev/loop0: UUID="76d25f06-[..]-4a036839aaef" UUID_SUB="2f6bcd52-[..]-81478c90a685" LABEL="sevendust:0" TYPE="linux_raid_member" 
/dev/loop1: UUID="76d25f06-[..]-4a036839aaef" UUID_SUB="575fa001-[..]-299f64bc7e78" LABEL="sevendust:0" TYPE="linux_raid_member"

# sudo /sbin/blkid -t LABEL=sevendust:0 | cut -d ":" -f 1 2>/dev/null
/dev/loop0
/dev/loop1

# sudo /sbin/blkid -l -t LABEL=sevendust:0 | cut -d ":" -f 1 2>/dev/null
/dev/loop0
====================================================

Comment 6 Sebastian Pipping gentoo-dev

2011-01-11 15:49:36 UTC

*** Bug 290603 has been marked as a duplicate of this bug. ***