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- What: /sys/class/pktcdvd/
- Date: Oct. 2006
- KernelVersion: 2.6.20
- Contact: Thomas Maier <balagi@justmail.de>
- Description:
- sysfs interface
- ---------------
- The pktcdvd module (packet writing driver) creates
- these files in the sysfs:
- (<devid> is in format major:minor )
- /sys/class/pktcdvd/
- add (0200) Write a block device id (major:minor)
- to create a new pktcdvd device and map
- it to the block device.
- remove (0200) Write the pktcdvd device id (major:minor)
- to it to remove the pktcdvd device.
- device_map (0444) Shows the device mapping in format:
- pktcdvd[0-7] <pktdevid> <blkdevid>
- /sys/class/pktcdvd/pktcdvd[0-7]/
- dev (0444) Device id
- uevent (0200) To send an uevent.
- /sys/class/pktcdvd/pktcdvd[0-7]/stat/
- packets_started (0444) Number of started packets.
- packets_finished (0444) Number of finished packets.
- kb_written (0444) kBytes written.
- kb_read (0444) kBytes read.
- kb_read_gather (0444) kBytes read to fill write packets.
- reset (0200) Write any value to it to reset
- pktcdvd device statistic values, like
- bytes read/written.
- /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/
- size (0444) Contains the size of the bio write
- queue.
- congestion_off (0644) If bio write queue size is below
- this mark, accept new bio requests
- from the block layer.
- congestion_on (0644) If bio write queue size is higher
- as this mark, do no longer accept
- bio write requests from the block
- layer and wait till the pktcdvd
- device has processed enough bio's
- so that bio write queue size is
- below congestion off mark.
- A value of <= 0 disables congestion
- control.
- Example:
- --------
- To use the pktcdvd sysfs interface directly, you can do:
- # create a new pktcdvd device mapped to /dev/hdc
- echo "22:0" >/sys/class/pktcdvd/add
- cat /sys/class/pktcdvd/device_map
- # assuming device pktcdvd0 was created, look at stat's
- cat /sys/class/pktcdvd/pktcdvd0/stat/kb_written
- # print the device id of the mapped block device
- fgrep pktcdvd0 /sys/class/pktcdvd/device_map
- # remove device, using pktcdvd0 device id 253:0
- echo "253:0" >/sys/class/pktcdvd/remove
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