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This makes the udev operation completely lockless by storing a
file for every node in /dev/.udevdb/* This solved the problem
with deadlocking concurrent udev processes waiting for each other
to release the file lock under heavy load.
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The attached patch contains a few patches against udev, to remove
use of various XSI:isms and bash:isms, and to change two scripts form
/bin/bash to /bin/sh. None of the bash-scripts in test/ uses any
bash-specific functions as far as I know, but I didn't touch them since
they aren't used runtime.
Rationale:
* Both of the /bin/bash-scripts are totally free from bashisms, hence they
don't need to be /bin/bash; using /bin/sh instead helps (mainly)
embedded-people
* local and source are bash:isms (well, they exist in several other
shells as well, but they aren't part of POSIX or any of its extensions)
* -a in tests is an XSI-extension, not part of strict POSIX, and is
easily replaced by &&
| http://www.opengroup.org/onlinepubs/009695399/utilities/test.html
* Use of fgrep is deprecated in POSIX in favour of grep -F (though fgrep
will remain in use for a long time...)
| http://www.opengroup.org/onlinepubs/009695399/utilities/grep.html
The fgrep-change isn't really necessary, since fgrep can always be
implemented as a shell-script, but the rest of the changes would really
be appreciated.
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priorities.
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Thanks to Gentoo for the list of these files.
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I had too much time during the holidays, so I played a bit with udev. The
changes are like last time mostly on the init stuff. I'm sending you this as
a great diff which is just for comments.
What it does:
-fix a typo in Makefile
-use only one "grep -v" instead of many
-don't include BK-Files into release (shrinks the stuff to 30%!)
-add a new init script which is LSB compliant
-add some flags to choose which one to use
-use /etc/udev/udev.conf in Redhat init script as the source for the udev
directory. If this is not done then the init script may create a directory
which udev itself isn't using (I changed /udev to /Udev to avoid collisions
with /usr and ran into this)
-first check for sysfs_dir before creating udev_root (maybe someone else has
already fixed this, I saw this discussion on lkml)
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instead of just removing the whole /udev directory.
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much faster
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Change made by Rolf Eike Beer <eike-hotplug@sf-tec.de>
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I integrated udev with Fedora Core. The main piece is simply building
/udev on boot, since we don't have an initramfs yet. We should also
clear out /udev on shutdown, for /udev directories mounted on persistent
media.
The attached script goes in /etc/init.d
Then do "chkconfig --add udev"
And the rest is handled automatically. I made it for Fedora but it will
probably work, with little change, on any Linux system.
Right now it only does sysfs-based discovery of block and tty devices,
since those are the only types of devices I have on my system. There is
a TODO in the script where we would add the other device types.
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