udev libsysfs diet (pre 2.0 version)

udev libsysfs diet (pre 2.0 version)

[Kay Sievers]

I've applied a new version of libsysfs which is much smaller and faster
than the old one.

After some discussion with the libsysfs maintainers we decided to change
the api to better reflect the current state of the kernels sysfs.
libsysfs will now only open attributes which content is explicitely
requested and it will not automatically go down into subdirectories to
look for attributes.

The next kernel version will have a "bus" link for physical devices
along with the already present "driver" link. The current "driver" link
on the class devices will be removed. This makes sysfs more consistent:
  o class devices may have a "device" link
  o physical devices may have the "bus" and the "driver"
To get the driver behind a class device just follow the device link and
get it from the physical device.

The new libsysfs will recognize these symlinks and does not need to
search through the whole /sys/bus directory to find the matching device.
udevstart is about 30% faster with all these changes now.

Thanks,
Kay



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