Bug#678696: Event based block device handling (fixes USB and nested devices problem)
 

Package: initramfs-tools
Version: 0.106
Severity: wishlist
Tags: patch

Hi,

the attached patch adds an event based loop for block devices to the
init script. New blockdevices are recorded in
/run/initramfs/block-events by an udev rule as they appear. The init
script repeadately waits for that and then calls
/scripts/local-block/* with a list of new devices storedin NEWDEVS
until $ROOT and $resume (if set) exists or a timeout is reached.

This fixes the problem that USB devices take too long to be
discovered and crypto, raid, lvm or multipath can't be started on
them. It also adds support for arbitrary nestings of them, e.g. raid5
over raid1.

For the event loop I needed the $resume device translated to the
device node earlier. This was previously done in
scripts/local-premount/resume. It was essentially the same code used
to translate the $ROOT so I created a new function translate_device()
in script/functions and used that for both $ROOT and $resume.

Note: hooks/block-event and scripts/block-event are executable, not
represented in the patch.

MfG
Goswin

-- System Information:
Debian Release: wheezy/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=C, LC_CTYPE=de_DE (charmap=ISO-8859-1)
Shell: /bin/sh linked to /bin/dash

Versions of packages initramfs-tools depends on:
ii cpio 2.11-7
ii klibc-utils 2.0~rc3-1
ii module-init-tools 3.16-1
ii udev 175-3.1

Versions of packages initramfs-tools recommends:
ii busybox 1:1.19.3-5

Versions of packages initramfs-tools suggests:
ii bash-completion 1:1.99-3

-- no debconf information

Bug#678696: Event based block device handling (fixes USB and nested devices problem)
 

Hi,

I filed bugs for cryptsetup, lvm, mdadm and multipath-tools to support
this solution (i.e. provide scripts/local-block/ sniplets) [#678688
#678691 #678692 #678693].

If anyone wants to test this prior to those packages being fixed the
scriplets below can be used.

MfG
Goswin

==> scripts/local-block/cryptoroot <==
#!/bin/sh

PREREQ=""

prereqs()
{
echo "$PREREQ"
}

case $1 in
# get pre-requisites
prereqs)
prereqs
exit 0
;;
esac

if [ -x /scripts/local-top/cryptoroot ]; then
exec /scripts/local-top/cryptoroot
fi

==> scripts/local-block/lvm2 <==
#!/bin/sh

PREREQ=""

prereqs()
{
echo "$PREREQ"
}

case $1 in
# get pre-requisites
prereqs)
prereqs
exit 0
;;
esac

if [ -x /scripts/local-top/lvm2 ]; then
exec /scripts/local-top/lvm2
fi

==> scripts/local-block/mdadm <==
#!/bin/sh

PREREQ=""

prereqs()
{
echo "$PREREQ"
}

case $1 in
# get pre-requisites
prereqs)
prereqs
exit 0
;;
esac

if [ -x /scripts/local-top/mdadm ]; then
exec /scripts/local-top/mdadm
fi




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