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Symlinks can have priorities now, the priority is assigned to the device
and specified with OPTIONS="link_priority=100". Devices with higher
priorities overwrite the symlinks of devices with lower priorities.
If the device, that currently owns the link goes away, the symlink
will be removed, and recreated, pointing to the next device with the
highest actual priority.
This should solve the issue, that inserting an USB-stick may overwrite the
/dev/disk/by-id/-link of another disk, and removes the entire link after the
USB-stick is disconnected. If no priorities are specified, the new link will
overwrite the current one, and if the device goes away, it will restore
the old link. It should be possible to assign lower priorities to removable
devices, if needed.
In multipath setups, we see several devices, which all connect to the same
volume, and therefore all try to create the same metadata-links. The
different path-devices are combined into one device-mapper device, which also
contains the same metadata. It should be possible, to assign multipath-table
device-mapper devices a higher priority, so path-devices that appear and
disappear, will not overwrite or delete the device-mapper device links.
This scheme is more consistent and makes it obvious if a match happens
against the event device only, or the full chain of parent devices.
The old key names are now:
BUS -> SUBSYSTEMS
ID -> KERNELS
SYSFS -> ATTRS
DRIVER -> DRIVERS
Match keys for the event device:
KERNEL
SUBSYSTEM
ATTR
DRIVER (in a future release, for now the same as DRIVERS)
Match keys for all devices along the parent device chain:
KERNELS
SUBSYSTEMS
ATTRS
DRIVERS
ID, BUS, SYSFS are no longer mentioned in the man page but still work.
DRIVER must be converted to DRIVERS to match the new scheme. For now,
an error is logged, if DRIVER is used. In a future release, the DRIVER
key behaviour will change.
Add negative cache for attributes and look for device in cache before doing
any sysfs access. (Three times speed up for a stupid 1000 rules SYSFS file).
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Request specific parents identified by subsystem and don't rely on
a predefined sequence.
Also let the devpath be longer than 72 chars, tsss ...
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
We never used any of the libsysfs convenience features. Here we replace
it completely with 300 lines of code, which are much simpler and a bit
faster cause udev(d) does not open any syfs file for a simple event which
does not need any parent device information.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
All udev state is kept in /$udev_root/.udev/ now. No option to
configure that anymore, it will always be there.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Most of the issues are fixed with the kernel we depend on, for the
remaing ones see the RELEASE-NOTES for a special rule to add.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Netlink will never get out-of-order and we just depend on it from
now on. Udevsend messages will have no effect if they contain a
sequence number (SEQNUM).
Thanks to Bastian Blank <waldi@debian.org>, for the debugging session
which identified a bug where the timeouts are not working if
inotify was not available. All the timeout handling is removed
now and this issue should be solved.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Any program can query with udevinfo for persistent device
attributes evaluated on device discovery now.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Handle all events with rules. If udev is expected to handle hotplug.d/
the exernal helper must be called.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Modern rules are expected to call notification and postprocessing with
the RUN key. For compatibility the current behavior can be emulated
with an external helper.
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
SUBSYSTEM=="block", RUN="/sbin/program"
will execute the program only for block device events.
ACTION="remove", SUBSYSTEM=="block", RUN"/sbin/program"
will execute the program, if a block device is removed.
With the "permissions only rules" we can just place:
MODE="0660", OWNER="root", GROUP="root"
at the beginning of the rules file and get exactly the same behavior.
If no values are given the compiled-in defaults are used.
