fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / Documentation / cdrom / packet-writing.txt

diff --git a/Documentation/cdrom/packet-writing.txt b/Documentation/cdrom/packet-writing.txt
index d34fcbc..7715d22 100644 (file)
--- a/Documentation/cdrom/packet-writing.txt
+++ b/Documentation/cdrom/packet-writing.txt
@@ -43,6 +43,8 @@ shall implement "true random writes with 2KB granularity", which means
 that it should be possible to put any filesystem with a block size >=
 2KB on such a disc. For example, it should be possible to do:
 
+       # dvd+rw-format /dev/hdc   (only needed if the disc has never
+                                   been formatted)
        # mkudffs /dev/hdc
        # mount /dev/hdc /cdrom -t udf -o rw,noatime
 
@@ -54,11 +56,20 @@ writes are not 32KB aligned.
 Both problems can be solved by using the pktcdvd driver, which always
 generates aligned writes.
 
+       # dvd+rw-format /dev/hdc
        # pktsetup dev_name /dev/hdc
        # mkudffs /dev/pktcdvd/dev_name
        # mount /dev/pktcdvd/dev_name /cdrom -t udf -o rw,noatime
 
 
+Packet writing for DVD-RAM media
+--------------------------------
+
+DVD-RAM discs are random writable, so using the pktcdvd driver is not
+necessary. However, using the pktcdvd driver can improve performance
+in the same way it does for DVD+RW media.
+
+
 Notes
 -----
 
@@ -79,6 +90,41 @@ Notes
   to create an ext2 filesystem on the disc.
 
 
+Using the pktcdvd sysfs interface
+---------------------------------
+
+Since Linux 2.6.19, the pktcdvd module has a sysfs interface
+and can be controlled by it. For example the "pktcdvd" tool uses
+this interface. (see http://people.freenet.de/BalaGi#pktcdvd )
+
+"pktcdvd" works similar to "pktsetup", e.g.:
+
+       # pktcdvd -a dev_name /dev/hdc
+       # mkudffs /dev/pktcdvd/dev_name
+       # mount -t udf -o rw,noatime /dev/pktcdvd/dev_name /dvdram
+       # cp files /dvdram
+       # umount /dvdram
+       # pktcdvd -r dev_name
+
+
+For a description of the sysfs interface look into the file:
+
+  Documentation/ABI/testing/sysfs-block-pktcdvd
+
+
+Using the pktcdvd debugfs interface
+-----------------------------------
+
+To read pktcdvd device infos in human readable form, do:
+
+       # cat /debug/pktcdvd/pktcdvd[0-7]/info
+
+For a description of the debugfs interface look into the file:
+
+  Documentation/ABI/testing/debugfs-pktcdvd
+
+
+
 Links
 -----