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Dave Jones
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Dec 12, 2006
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| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: 0cfea5dd98205f2fa318836da664a7d7df1afbc1 | ||
| refs/heads/master: f0eef25339f92f7cd4aeea23d9ae97987a5a1e82 |
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| # Top-level generic files | ||
| # | ||
| tags | ||
| TAGS | ||
| vmlinux* | ||
| System.map | ||
| Module.symvers | ||
|
|
||
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,20 @@ | ||
| What: /debug/pktcdvd/pktcdvd[0-7] | ||
| Date: Oct. 2006 | ||
| KernelVersion: 2.6.19 | ||
| Contact: Thomas Maier <balagi@justmail.de> | ||
| Description: | ||
|
|
||
| debugfs interface | ||
| ----------------- | ||
|
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||
| The pktcdvd module (packet writing driver) creates | ||
| these files in debugfs: | ||
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| /debug/pktcdvd/pktcdvd[0-7]/ | ||
| info (0444) Lots of human readable driver | ||
| statistics and infos. Multiple lines! | ||
|
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| Example: | ||
| ------- | ||
|
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| cat /debug/pktcdvd/pktcdvd0/info |
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| What: /sys/class/pktcdvd/ | ||
| Date: Oct. 2006 | ||
| KernelVersion: 2.6.19 | ||
| Contact: Thomas Maier <balagi@justmail.de> | ||
| Description: | ||
|
|
||
| sysfs interface | ||
| --------------- | ||
|
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| The pktcdvd module (packet writing driver) creates | ||
| these files in the sysfs: | ||
| (<devid> is in format major:minor ) | ||
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| /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. | ||
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| remove (0200) Write the pktcdvd device id (major:minor) | ||
| to it to remove the pktcdvd device. | ||
|
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| device_map (0444) Shows the device mapping in format: | ||
| pktcdvd[0-7] <pktdevid> <blkdevid> | ||
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| /sys/class/pktcdvd/pktcdvd[0-7]/ | ||
| dev (0444) Device id | ||
| uevent (0200) To send an uevent. | ||
|
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| /sys/class/pktcdvd/pktcdvd[0-7]/stat/ | ||
| packets_started (0444) Number of started packets. | ||
| packets_finished (0444) Number of finished packets. | ||
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| kb_written (0444) kBytes written. | ||
| kb_read (0444) kBytes read. | ||
| kb_read_gather (0444) kBytes read to fill write packets. | ||
|
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| reset (0200) Write any value to it to reset | ||
| pktcdvd device statistic values, like | ||
| bytes read/written. | ||
|
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| /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/ | ||
| size (0444) Contains the size of the bio write | ||
| queue. | ||
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| congestion_off (0644) If bio write queue size is below | ||
| this mark, accept new bio requests | ||
| from the block layer. | ||
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| 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. | ||
|
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||
|
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| Example: | ||
| -------- | ||
| To use the pktcdvd sysfs interface directly, you can do: | ||
|
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| # 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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