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DVD-RAM support for pktcdvd

PATCH New Peter Osterlund 1 participant 1 message Mar 12, 2005

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Documentation Block layer Uniform cdrom driver
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Peter Osterlund

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PATCH 1/1 DVD-RAM support for pktcdvd

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 <[email protected]>

---

 linux-petero/Documentation/cdrom/packet-writing.txt |    8 ++++++++
 linux-petero/drivers/block/pktcdvd.c                |    9 +++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)
drivers/block/pktcdvd.c renamed from drivers/block/pktcdvd.c~packet-dvd-ram +7 -2
diff -puN drivers/block/pktcdvd.c~packet-dvd-ram drivers/block/pktcdvd.c
@@ -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:
Documentation/cdrom/packet-writing.txt renamed from Documentation/cdrom/packet-writing.txt~packet-dvd-ram +8 -0
diff -puN Documentation/cdrom/packet-writing.txt~packet-dvd-ram Documentation/cdrom/packet-writing.txt
@@ -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
 -----

_

Signature · 2 lines
Peter Osterlund - [email protected]
http://web.telia.com/~u89404340