From b67c555b305aae60c9dc8f1065cdeed0d4cf81c3 Mon Sep 17 00:00:00 2001
From: Thomas Schmitt <scdbackup@gmx.net>
Date: Fri, 22 Sep 2006 19:29:11 +0000
Subject: [PATCH] Implemented finding matching /dev/sgN from /dev/srM or
 /dev/scdK

---
 libburn/drive.c | 56 +++++++++++++++++++++++++++++++++++++++++++------
 libburn/sg.c    | 34 ++++++++++++++++++++++++++++++
 libburn/sg.h    |  2 ++
 3 files changed, 86 insertions(+), 6 deletions(-)

diff --git a/libburn/drive.c b/libburn/drive.c
index 0c6ad10..7a7388c 100644
--- a/libburn/drive.c
+++ b/libburn/drive.c
@@ -724,7 +724,7 @@ int burn_drive_find_devno(dev_t devno, char adr[])
 		if(strlen(fname) >= BURN_DRIVE_ADR_LEN)
 			return -1;
 
-fprintf(stderr,"libburn experimental: burn_drive_find_devno( 0x%llX ) found %s\n", (long long) devno, fname);
+fprintf(stderr,"libburn experimental: burn_drive_find_devno( 0x%lX ) found %s\n", (long) devno, fname);
 
 		strcpy(adr, fname);
 		return 1;
@@ -732,6 +732,52 @@ fprintf(stderr,"libburn experimental: burn_drive_find_devno( 0x%llX ) found %s\n
 	return 0;
 }
 
+/* ts A60922 ticket 33 */
+/* Try to find an enumerated address with the same host,channel,target,lun
+   as path */
+int burn_drive_find_scsi_adr(char *path, char adr[])
+{
+	char fname[4096];
+	int i, ret = 0, first = 1;
+	int host_no, channel_no, target_no, lun_no;
+	int i_host_no, i_channel_no, i_target_no, i_lun_no;
+
+	ret = sg_obtain_scsi_adr(path, &host_no, &channel_no, &target_no,
+			         &lun_no);
+	if(ret <= 0) {
+
+fprintf(stderr,"libburn experimental: sg_obtain_scsi_adr( %s ) returns %d\n", path, ret);
+
+		return 0;
+	}
+
+fprintf(stderr,"libburn experimental: burn_drive_find_scsi_adr( %s ) : %d,%d,%d,%d\n", path, host_no, channel_no, target_no, lun_no);
+
+
+	while (1) {
+		ret= sg_give_next_adr(&i, fname, sizeof(fname), first);
+		if(ret <= 0)
+	break;
+		first = 0;
+		ret = sg_obtain_scsi_adr(fname, &i_host_no, &i_channel_no,
+				 &i_target_no, &i_lun_no);
+		if(ret == -1)
+	continue;
+		if(i_host_no != host_no || i_channel_no != channel_no ||
+		   i_target_no != target_no || i_lun_no != lun_no)
+	continue;
+		if(strlen(fname) >= BURN_DRIVE_ADR_LEN)
+			return -1;
+
+fprintf(stderr,"libburn experimental: burn_drive_find_scsi_adr( %s ) found %s\n", path, fname);
+
+		strcpy(adr, fname);
+		return 1;
+	}
+	return 0;
+}
+
+
 /* ts A60922 ticket 33 */
 /** Try to convert a given existing filesystem address into a persistent drive
     address.  */
@@ -768,11 +814,9 @@ fprintf(stderr,"libburn experimental: lstat( %s ) returns -1\n",path);
 		ret = burn_drive_find_devno(stbuf.st_rdev, adr);
 		if(ret > 0)
 			return 1;
-
-		/* >>> if SCSI device :
-		       try to find enumerated device with same Bus,Target,Lun
-		*/;
-
+		ret = burn_drive_find_scsi_adr(path, adr);
+		if(ret > 0)
+			return 1;
 	}
 
 fprintf(stderr,"libburn experimental: Nothing found for %s \n",path);
diff --git a/libburn/sg.c b/libburn/sg.c
index 1827a54..4c44e64 100644
--- a/libburn/sg.c
+++ b/libburn/sg.c
@@ -248,6 +248,9 @@ void sg_enumerate(void)
 		close(fd);
 		if (sid.scsi_type != TYPE_ROM)
 			continue;
+/* <<< ts A60922 (use SCSI_IOCTL_GET_IDLUN on block devices) 
+		fprintf(stderr,"libburn experimental: SCSI triple: %d,%d,%d\n",sid.host_no,sid.scsi_id,sid.lun);
+*/
 
 		enumerate_common(fname);
 	}
@@ -556,3 +559,34 @@ enum response scsi_error(struct burn_drive *d, unsigned char *sense,
 	burn_print(1, "key:0x%x, asc:0x%x, ascq:0x%x\n", key, asc, ascq);
 	return FAIL;
 }
+
+/* ts A60922 */
+/** Try to obtain SCSI address parameters.
+    @return  1 is success , 0 is failure
+*/
+int sg_obtain_scsi_adr(char *path, int *host_no, int *channel_no,
+                       int *target_no, int *lun_no)
+{
+	int fd, ret;
+	struct my_scsi_idlun {
+		int x;
+		int host_unique_id;
+	};
+ 	struct my_scsi_idlun idlun;
+
+	fd = open(path, O_RDONLY | O_NONBLOCK);
+	if(fd < 0)
+		return 0;
+
+	/* http://www.tldp.org/HOWTO/SCSI-Generic-HOWTO/scsi_g_idlun.html */
+	ret= ioctl(fd, SCSI_IOCTL_GET_IDLUN, &idlun);
+
+	close(fd);
+	if(ret == -1)
+		return(0);
+	*host_no= (idlun.x>>24)&255;
+	*channel_no= (idlun.x>>16)&255;
+	*target_no= (idlun.x)&255;
+	*lun_no= (idlun.x>>8)&255;
+	return 1;
+}
diff --git a/libburn/sg.h b/libburn/sg.h
index afb5687..cc9870a 100644
--- a/libburn/sg.h
+++ b/libburn/sg.h
@@ -12,6 +12,8 @@ enum response
 /* ts A60922 ticket 33 */
 int sg_give_next_adr(int *idx, char adr[], int adr_size, int initialize);
 int sg_is_enumerable_adr(char *adr);
+int sg_obtain_scsi_adr(char *path, int *host_no, int *channel_no,
+                       int *target_no, int *lun_no);
 
 void sg_enumerate(void);
 void ata_enumerate(void);