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- sysfs interface
- ---------------
- The pktcdvd module (packet writing driver) creates the following files in the
- sysfs: (<devid> is in the format major:minor)
- What: /sys/class/pktcdvd/add
- What: /sys/class/pktcdvd/remove
- What: /sys/class/pktcdvd/device_map
- Date: Oct. 2006
- KernelVersion: 2.6.20
- Contact: Thomas Maier <[email protected]>
- Description:
- ========== ==============================================
- add (WO) Write a block device id (major:minor) to
- create a new pktcdvd device and map it to the
- block device.
- remove (WO) Write the pktcdvd device id (major:minor)
- to remove the pktcdvd device.
- device_map (RO) Shows the device mapping in format:
- pktcdvd[0-7] <pktdevid> <blkdevid>
- ========== ==============================================
- What: /sys/class/pktcdvd/pktcdvd[0-7]/dev
- What: /sys/class/pktcdvd/pktcdvd[0-7]/uevent
- Date: Oct. 2006
- KernelVersion: 2.6.20
- Contact: Thomas Maier <[email protected]>
- Description:
- dev: (RO) Device id
- uevent: (WO) To send a uevent
- What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/packets_started
- What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/packets_finished
- What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_written
- What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_read
- What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_read_gather
- What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/reset
- Date: Oct. 2006
- KernelVersion: 2.6.20
- Contact: Thomas Maier <[email protected]>
- Description:
- packets_started: (RO) Number of started packets.
- packets_finished: (RO) Number of finished packets.
- kb_written: (RO) kBytes written.
- kb_read: (RO) kBytes read.
- kb_read_gather: (RO) kBytes read to fill write packets.
- reset: (WO) Write any value to it to reset
- pktcdvd device statistic values, like
- bytes read/written.
- What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/size
- What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/congestion_off
- What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/congestion_on
- Date: Oct. 2006
- KernelVersion: 2.6.20
- Contact: Thomas Maier <[email protected]>
- Description:
- ============== ================================================
- size (RO) Contains the size of the bio write queue.
- congestion_off (RW) If bio write queue size is below this mark,
- accept new bio requests from the block layer.
- congestion_on (RW) 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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