From: Peter Osterlund <petero2@telia.com>
This patch makes it possible to use the packet writing driver with
DVD-RAM discs. The pktcdvd driver is not needed for writing to DVD-RAM
discs but it can improve write performance. Polgár István reports:
I wrote 178716Kb data to DVD-RAM without pktcdvd driver within
4.54 minutes. With pktcdvd driver it took me 2.33 minutes.
Signed-off-by: Peter Osterlund <petero2@telia.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/Documentation/cdrom/packet-writing.txt | 8 ++++++++
25-akpm/drivers/block/pktcdvd.c | 9 +++++++--
2 files changed, 15 insertions(+), 2 deletions(-)
diff -puN Documentation/cdrom/packet-writing.txt~dvd-ram-support-for-pktcdvd Documentation/cdrom/packet-writing.txt
--- 25/Documentation/cdrom/packet-writing.txt~dvd-ram-support-for-pktcdvd 2005-03-13 13:13:37.000000000 -0800
+++ 25-akpm/Documentation/cdrom/packet-writing.txt 2005-03-13 13:13:37.000000000 -0800
@@ -62,6 +62,14 @@ generates aligned writes.
# 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
-----
diff -puN drivers/block/pktcdvd.c~dvd-ram-support-for-pktcdvd drivers/block/pktcdvd.c
--- 25/drivers/block/pktcdvd.c~dvd-ram-support-for-pktcdvd 2005-03-13 13:13:37.000000000 -0800
+++ 25-akpm/drivers/block/pktcdvd.c 2005-03-13 13:13:37.000000000 -0800
@@ -1421,8 +1421,8 @@ static int pkt_set_write_settings(struct
char buffer[128];
int ret, size;
- /* doesn't apply to DVD+RW */
- if (pd->mmc3_profile == 0x1a)
+ /* doesn't apply to DVD+RW or DVD-RAM */
+ if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
return 0;
memset(buffer, 0, sizeof(buffer));
@@ -1536,6 +1536,7 @@ static int pkt_good_disc(struct pktcdvd_
break;
case 0x1a: /* DVD+RW */
case 0x13: /* DVD-RW */
+ case 0x12: /* DVD-RAM */
return 0;
default:
printk("pktcdvd: Wrong disc profile (%x)\n", pd->mmc3_profile);
@@ -1601,6 +1602,9 @@ static int pkt_probe_settings(struct pkt
case 0x13: /* DVD-RW */
printk("pktcdvd: inserted media is DVD-RW\n");
break;
+ case 0x12: /* DVD-RAM */
+ printk("pktcdvd: inserted media is DVD-RAM\n");
+ break;
default:
printk("pktcdvd: inserted media is CD-R%s\n", di.erasable ? "W" : "");
break;
@@ -1893,6 +1897,7 @@ static int pkt_open_write(struct pktcdvd
switch (pd->mmc3_profile) {
case 0x13: /* DVD-RW */
case 0x1a: /* DVD+RW */
+ case 0x12: /* DVD-RAM */
DPRINTK("pktcdvd: write speed %ukB/s\n", write_speed);
break;
default:
_