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sirtow
n00b
Joined: 02 Nov 2013
Posts: 10
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 Posted: Sat Nov 02, 2013 5:21 pm Post subject: Missing /dev/root |
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Hi, i read about /dev/root not to be used but i have one application that relies on existence of that link so i was looking for a way to make this link to be created at boot time.
I have udev 204 and i turned on the | Code: | | rc_dev_root_symlink="YES" |
in /etc/conf.d/udev but seems its not working...
I can see that udev rule defined in | Code: | | /lib/udev/dev-root-link.sh |
is being created but the actual link is not being created in dev ...
Was wondering if anyone can direct me where to dig...
i have vanilla kernel 3.10.9
and my emerge --info :
| Code: |
Portage 2.1.11.62 (default/linux/amd64/13.0, gcc-4.4.3, glibc-2.12.2, 3.10.9 x86_64)
=================================================================
System uname: Linux-3.10.9-x86_64-Intel-R-_Core-TM-_i3_CPU_540_@_3.07GHz-with-gentoo-2.2
KiB Mem: 4040836 total, 58320 free
KiB Swap: 4008212 total, 4008212 free
Timestamp of tree: Sat, 02 Nov 2013 06:15:01 +0000
ld GNU ld (GNU Binutils) 2.21
app-shells/bash: 4.2_p45
dev-java/java-config: 2.1.11-r3
dev-lang/python: 2.6.5-r2, 2.7.3-r3, 3.1.2-r3, 3.2.3-r2
dev-util/cmake: 2.8.10.2-r2
dev-util/pkgconfig: 0.27.1
sys-apps/baselayout: 2.2
sys-apps/openrc: 0.11.8
sys-apps/sandbox: 2.5
sys-devel/autoconf: 2.68
sys-devel/automake: 1.9.6-r3, 1.11.1, 1.12.6
sys-devel/binutils: 2.21
sys-devel/gcc: 4.4.3-r2, 4.5.2
sys-devel/gcc-config: 1.4.1
sys-devel/libtool: 2.4-r1
sys-devel/make: 3.82-r4
sys-kernel/linux-headers: 2.6.36.1 (virtual/os-headers)
sys-libs/glibc: 2.12.2
Repositories: gentoo
ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="*"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.3/ext-active/ /etc/php/apache2-php5.4/ext-active/ /etc/php/cgi-php5.3/ext-active/ /etc/php/cgi-php5.4/ext-active/ /etc/php/cli-php5.3/ext-active/ /etc/php/cli-php5.4/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-O2 -pipe"
DISTDIR="/usr/portage/distfiles"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="http://mirror.lug.udel.edu/pub/gentoo/ http://mirror.datapipe.net/gentoo"
LANG="en_US.UTF8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j5"
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SamuliSuominen
Retired Dev
Joined: 30 Sep 2005
Posts: 2133
Location: Finland
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| Posted: Sun Nov 03, 2013 9:46 am Post subject: Re: Missing /dev/root |
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| sirtow wrote: | Hi, i read about /dev/root not to be used but i have one application that relies on existence of that link so i was looking for a way to make this link to be created at boot time.
I have udev 204 and i turned on the | Code: | | rc_dev_root_symlink="YES" |
in /etc/conf.d/udev but seems its not working...
I can see that udev rule defined in | Code: | | /lib/udev/dev-root-link.sh |
is being created but the actual link is not being created in dev ...
Was wondering if anyone can direct me where to dig...
i have vanilla kernel 3.10.9
and my emerge --info :
| Code: |
Portage 2.1.11.62 (default/linux/amd64/13.0, gcc-4.4.3, glibc-2.12.2, 3.10.9 x86_64)
=================================================================
System uname: Linux-3.10.9-x86_64-Intel-R-_Core-TM-_i3_CPU_540_@_3.07GHz-with-gentoo-2.2
KiB Mem: 4040836 total, 58320 free
KiB Swap: 4008212 total, 4008212 free
Timestamp of tree: Sat, 02 Nov 2013 06:15:01 +0000
ld GNU ld (GNU Binutils) 2.21
app-shells/bash: 4.2_p45
dev-java/java-config: 2.1.11-r3
dev-lang/python: 2.6.5-r2, 2.7.3-r3, 3.1.2-r3, 3.2.3-r2
dev-util/cmake: 2.8.10.2-r2
dev-util/pkgconfig: 0.27.1
sys-apps/baselayout: 2.2
sys-apps/openrc: 0.11.8
sys-apps/sandbox: 2.5
sys-devel/autoconf: 2.68
sys-devel/automake: 1.9.6-r3, 1.11.1, 1.12.6
sys-devel/binutils: 2.21
sys-devel/gcc: 4.4.3-r2, 4.5.2
sys-devel/gcc-config: 1.4.1
sys-devel/libtool: 2.4-r1
sys-devel/make: 3.82-r4
sys-kernel/linux-headers: 2.6.36.1 (virtual/os-headers)
sys-libs/glibc: 2.12.2
Repositories: gentoo
ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="*"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.3/ext-active/ /etc/php/apache2-php5.4/ext-active/ /etc/php/cgi-php5.3/ext-active/ /etc/php/cgi-php5.4/ext-active/ /etc/php/cli-php5.3/ext-active/ /etc/php/cli-php5.4/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-O2 -pipe"
DISTDIR="/usr/portage/distfiles"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="http://mirror.lug.udel.edu/pub/gentoo/ http://mirror.datapipe.net/gentoo"
LANG="en_US.UTF8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j5"
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rc_dev_root_symlink="YES" is the *default* so removing the # and leaving it to YES won't change anything, as the purpose of the line in the /etc/conf.d/udev is to allow people to set rc_dev_root_symlink="NO" if they want
is /run mounted as tmpfs? check by `mount | grep /run`
is udev in the sysinit runlevel? check by `rc-update show | grep udev`
does running /lib/udev/dev-root-link.sh by hand as root create /run/udev/rules.d/61-dev-root-link.rules?
and you are not using BTRFS as filesystem? that filesystem in particular would be incompatible with /dev/root symlink and thus be skipped
once the dev-root-link.sh has created /run/udev/rules.d/61-dev-root-link.rules, then running `udevadm trigger` as root will create /dev/root symlink without booting
what is the output of command `udevadm info --export --export-prefix=ROOT_ --device-id-of-file=/`? for me it shows, using EXT4 and /dev/sda1 as my root:
| Code: |
# udevadm info --export --export-prefix=ROOT_ --device-id-of-file=/
ROOT_MAJOR=8
ROOT_MINOR=1
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sirtow
n00b
Joined: 02 Nov 2013
Posts: 10
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| Posted: Sun Nov 03, 2013 6:30 pm Post subject: |
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Thanks for thereply ssuominen. I tried to answer your question below. Seems that all is setup ok but at the end its not working...
| Quote: | | is /run mounted as tmpfs? check by `mount | grep /run` |
| Code: | | tmpfs on /run type tmpfs (rw,nosuid,nodev,relatime,mode=755) |
| Quote: | | is udev in the sysinit runlevel? check by `rc-update show | grep udev` |
| Code: | udev | sysinit
udev-mount | sysinit
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| Quote: | | does running /lib/udev/dev-root-link.sh by hand as root create /run/udev/rules.d/61-dev-root-link.rules? |
Yes it does :
| Code: |
pluto ~ # ls -l /run/udev/rules.d/61-dev-root-link.rules
-rw-r--r-- 1 root root 92 Nov 2 13:23 /run/udev/rules.d/61-dev-root-link.rules
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| Quote: | | and you are not using BTRFS as filesystem? |
| Code: |
pluto ~ # mount
rootfs on / type rootfs (rw)
/dev/root on / type xfs (rw,noatime,attr2,inode64,noquota)
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| Quote: | | once the dev-root-link.sh has created /run/udev/rules.d/61-dev-root-link.rules, then running `udevadm trigger` as root will create /dev/root symlink without booting |
Yes, this is my expectation... but its not happening. i dont get root created under dev after boot nor by manually running the trigger 
| Quote: | | what is the output of command `udevadm info --export --export-prefix=ROOT_ --device-id-of-file=/`? |
| Code: | pluto ~ # udevadm info --export --export-prefix=ROOT_ --device-id-of-file=/
ROOT_MAJOR=8
ROOT_MINOR=3
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Also the content of the generated rule file :
| Code: | | ACTION=="add|change", SUBSYSTEM=="block", ENV{MAJOR}=="8", ENV{MINOR}=="3", SYMLINK+="root" |
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sirtow
n00b
Joined: 02 Nov 2013
Posts: 10
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| Posted: Sun Nov 03, 2013 6:52 pm Post subject: |
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Not sure if im right, but udevadm trigger triggers action=change and subsytem acpi/input...
I tried to run
| Code: | udevadm trigger --action=change --subsystem-match=block
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and it produce no log whatsoever from udevd...
Im still puzzled what is going on with my system...
Update
As suggested on stackexchange for similar problem (rules not fired) i tried :
| Code: | | echo change > /sys/block/sda/sda3/uevent |
and link created :
| Code: |
seq 5320 queued, 'change' 'block'
seq 5320 forked new worker [16482]
seq 5320 running
no db file to read /run/udev/data/b8:3: No such file or directory
device 0x22f22d0 has devpath '/block/sda'
device 0x22f22d0 filled with db file data
LINK 'disk/by-id/scsi-35000c500455c29d9-part3' /lib64/udev/rules.d/60-persistent-storage.rules:43
IMPORT builtin 'blkid' /lib64/udev/rules.d/60-persistent-storage.rules:70
probe /dev/sda3 raid offset=0
LINK 'disk/by-uuid/8ac44b7a-fa92-4c19-b065-e637725bf107' /lib64/udev/rules.d/60-persistent-storage.rules:76
LINK 'disk/by-id/wwn-0x5000c500455c29d9-part3' /lib64/udev/rules.d/60-persistent-storage.rules:81
LINK 'root' /etc/udev/rules.d/61-dev-root-link.rules:1
handling device node '/dev/sda3', devnum=b8:3, mode=0600, uid=0, gid=0
creating symlink '/dev/block/8:3' to '../sda3'
creating link '/dev/disk/by-id/scsi-35000c500455c29d9-part3' to '/dev/sda3'
creating symlink '/dev/disk/by-id/scsi-35000c500455c29d9-part3' to '../../sda3'
creating link '/dev/disk/by-id/wwn-0x5000c500455c29d9-part3' to '/dev/sda3'
creating symlink '/dev/disk/by-id/wwn-0x5000c500455c29d9-part3' to '../../sda3'
creating link '/dev/disk/by-uuid/8ac44b7a-fa92-4c19-b065-e637725bf107' to '/dev/sda3'
creating symlink '/dev/disk/by-uuid/8ac44b7a-fa92-4c19-b065-e637725bf107' to '../../sda3'
creating link '/dev/root' to '/dev/sda3'
creating symlink '/dev/root' to 'sda3'
created db file '/run/udev/data/b8:3' for '/block/sda/sda3'
adding watch on '/dev/sda3'
created db file '/run/udev/data/b8:3' for '/block/sda/sda3'
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Something is wrong here... |
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sirtow
n00b
Joined: 02 Nov 2013
Posts: 10
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| Posted: Tue Nov 05, 2013 4:05 pm Post subject: |
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For that matter i have no links created under /dev/disk/by-XXX for any disks except LVM/md (those are ok).
| Code: |
ls -l /sys/block/ | grep -v "ram\|loop"
total 0
drwxr-xr-x 7 root root 0 Nov 3 16:12 dm-0
drwxr-xr-x 7 root root 0 Nov 3 16:12 md0
drwxr-xr-x 9 root root 0 Nov 3 16:12 sda
drwxr-xr-x 6 root root 0 Nov 3 16:12 sdb
drwxr-xr-x 6 root root 0 Nov 3 16:12 sdc
drwxr-xr-x 8 root root 0 Nov 3 16:12 sdd
drwxr-xr-x 6 root root 0 Nov 3 16:12 sde
drwxr-xr-x 6 root root 0 Nov 3 16:12 sdf
drwxr-xr-x 8 root root 0 Nov 4 19:38 sdg
drwxr-xr-x 6 root root 0 Nov 3 16:12 sr0
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and
| Code: |
ls -l /dev/disk/by-id/
total 0
lrwxrwxrwx 1 root root 10 Nov 3 16:12 dm-name-vg1-vol1 -> ../../dm-0
lrwxrwxrwx 1 root root 10 Nov 3 16:12 dm-uuid-LVM-v4fAsUonyeAcr7XPJJrQFL8rfPq9ictZJuUHndI6qzpXlleXLkVorsuaFUXDtLz0 -> ../../dm-0
lrwxrwxrwx 1 root root 9 Nov 3 16:12 md-name-pluto:0 -> ../../md0
lrwxrwxrwx 1 root root 9 Nov 3 16:12 md-uuid-e26f4884:36659c94:47180bec:6c959c54 -> ../../md0
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Any ideas? |
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sirtow
n00b
Joined: 02 Nov 2013
Posts: 10
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| Posted: Tue Nov 05, 2013 9:55 pm Post subject: |
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Went little bit further and enabled udev monitoring and logging.
I can see lvm/md related events in log but not to any other ...
| Code: |
grep "queued.*block" /var/log/messages -A5
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 8.973403] udevd[1248]: seq 1739 queued, 'change' 'block'
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 8.973423] udevd[1248]: passed 183 bytes to netlink monitor 0x7a23a0
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 8.973511] udevd[1269]: seq 1739 running
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 8.973612] udevd[1269]: no db file to read /run/udev/data/b9:0: No such file or directory
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 8.973669] udevd[1269]: handling device node '/dev/md0', devnum=b9:0, mode=0600, uid=0, gid=0
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 8.973679] udevd[1269]: creating symlink '/dev/block/9:0' to '../md0'
--
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.006236] udevd[1248]: seq 1741 queued, 'change' 'block'
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.006249] udevd[1248]: passed 183 bytes to netlink monitor 0x7a23a0
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.006266] udevd[1269]: seq 1741 running
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.006338] udevd[1269]: device 0x7b0240 filled with db file data
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.006376] udevd[1269]: IMPORT '/sbin/mdadm --detail --export /dev/md0' /lib64/udev/rules.d/64-md-raid.rules:34
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.006570] udevd[1364]: starting '/sbin/mdadm --detail --export /dev/md0'
--
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.568211] udevd[1248]: seq 1743 queued, 'add' 'block'
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.568217] udevd[1269]: seq 1742 running
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.568222] udevd[1248]: passed 184 bytes to netlink monitor 0x7a23a0
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.568268] udevd[1269]: no db file to read /run/udev/data/+bdi:253:0: No such file or directory
[Nov 5 15:52:40][pluto][kernel][06][kern][info] [ 9.568284] bio: create slab <bio-1> at 1
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.568326] udevd[1269]: passed -1 bytes to netlink monitor 0x7c4a80
--
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.568420] udevd[1248]: seq 1744 queued, 'change' 'block'
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.568428] udevd[1270]: no db file to read /run/udev/data/b253:0: No such file or directory
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.568451] udevd[1270]: GROUP 6 /lib64/udev/rules.d/50-udev-default.rules:50
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.568474] udevd[1270]: handling device node '/dev/dm-0', devnum=b253:0, mode=0660, uid=0, gid=6
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.568481] udevd[1270]: set permissions /dev/dm-0, 060660, uid=0, gid=6
[Nov 5 15:52:40][pluto][][1f][daemon][debug] 9.568498] udevd[1270]: creating symlink '/dev/block/253:0' to '../dm-0'
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Why no events are being generated for rest of my sata disks? |
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SamuliSuominen
Retired Dev
Joined: 30 Sep 2005
Posts: 2133
Location: Finland
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| Posted: Mon Nov 11, 2013 1:48 pm Post subject: |
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| sirtow wrote: |
Update
As suggested on stackexchange for similar problem (rules not fired) i tried :
| Code: | | echo change > /sys/block/sda/sda3/uevent |
Something is wrong here... |
I don't get it -- the kernel should change the uevent, echoing in by hand to /sys doesn't seem right at all. If I had to guess, there is some misconfiguration in your kernel itself.
http://www.mpipks-dresden.mpg.de/~mueller/docs/suse10.1/suselinux-manual_en/manual/sec.udev.kernel.html
If you find the reason for this behavior, please let me know here so I can do, if required, any adjustments in the /dev/root creating process itself. Perhaps there is some simple kernel CONFIG_ check missing from eg. udev's ebuild.
You have verified emerging sys-fs/udev doesn't print out any missing kernel opt messages? |
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sirtow
n00b
Joined: 02 Nov 2013
Posts: 10
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| Posted: Mon Nov 11, 2013 8:07 pm Post subject: |
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At the end it was two configuration parameters that were miss configured :
- Probe all LUNs on each SCSI device - Cause the missing sd* entires to appear under /dev
- CONFIG_SYSFS_DEPRECATED - It was set to "y" causing problems with udev 204. Un-setting it triggered relevant rules and creation /dev/root and rest of links udner /dev/disk ...
So at the end it was my upgrade process of kernel + udev that lead to the problem... I updated the kernel first (while keeping deprecated flag on) but didn't remove it after updating udev...
Thanks for spending your time ssuominen. |
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