New option drive_scsi_dev_family=sr|scd|sg

cdrskin/cdrskin.1

@@ -2,7 +2,7 @@
 .\" First parameter, NAME, should be all caps
 .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
 .\" other parameters are allowed: see man(7), man(1)
-.TH CDRSKIN 1 "March 6, 2007"
+.TH CDRSKIN 1 "March 14, 2007"
 .\" Please adjust this date whenever revising the manpage.
 .\"
 .\" Some roff macros, for reference:
@@ -725,6 +725,13 @@ This is not guaranteed to work with all drivers. Some need nonblocking i/o.
 Linux specific: Do not ask the operating system to prevent opening busy drives.
 Wether this leads to senseful behavior depends on operating system and kernel.
 .TP
+.BI drive_scsi_dev_family= sr | scd | sg
+Linux specific: Select a SCSI device file family to be used for drive command
+transactions. Normally this is /dev/sgN but on modern kernels it might be
+helpful to use drive_scsi_dev_family=sr in order to meet other programs at
+a common device file for each drive. On kernel 2.4 this will find no drives.
+Device file family /dev/hdX on kernel 2.6 is not affected by this setting.
+.TP
 .BI \--drive_scsi_exclusive
 Linux specific:
 Try to exclusively reserve device files /dev/srN, /dev/scdM, /dev/stK of drive.

cdrskin/cdrskin.c

@@ -131,6 +131,7 @@ or
 /* Place novelty switch macros here. 
    Move them down to Cdrskin_libburn_from_pykix_svN on version leap
 */
+#define Cdrskin_libburn_preset_device_familY 1
 
 #endif /* Cdrskin_libburn_0_3_5 */
 
@@ -1427,9 +1428,14 @@ struct CdrpreskiN {
  /** Wether to abort when a busy drive is encountered during bus scan */
  int abort_on_busy_drive;
 
- /** Wether to try to avoid collisions when opening drives */
+ /** Linux specific : Wether to try to avoid collisions when opening drives */
  int drive_exclusive;
 
+ /** Linux specific : Device file address family to use :
+     0=default , 1=sr , 2=scd , 4=sg */
+ int drive_scsi_dev_family;
+ 
+
  /** Wether to try to wait for unwilling drives to become willing to open */
  int drive_blocking;
 
@@ -1490,6 +1496,7 @@ int Cdrpreskin_new(struct CdrpreskiN **preskin, int flag)
  o->scan_demands_drive= 0;
  o->abort_on_busy_drive= 0;
  o->drive_exclusive= 1;
+ o->drive_scsi_dev_family= 0;
  o->drive_blocking= 0;
  strcpy(o->write_mode_name,"DEFAULT");
 
@@ -1959,6 +1966,17 @@ set_dev:;
    } else if(strcmp(argv[i],"--drive_not_exclusive")==0) {
      o->drive_exclusive= 0;
 
+   } else if(strncmp(argv[i],"drive_scsi_dev_family=",22)==0) {
+     value_pt= argv[i]+22;
+     if(strcmp(value_pt,"sr")==0)
+       o->drive_scsi_dev_family= 1;
+     else if(strcmp(value_pt,"scd")==0)
+       o->drive_scsi_dev_family= 2;
+     else if(strcmp(value_pt,"sg")==0)
+       o->drive_scsi_dev_family= 4;
+     else
+       o->drive_scsi_dev_family= 0;
+
    } else if(strcmp(argv[i],"--drive_scsi_exclusive")==0) {
      o->drive_exclusive= 2;
 
@@ -2011,6 +2029,9 @@ set_dev:;
      printf("                    (might be stalled by a busy hard disk)\n");
      printf(" --drive_not_exclusive  do not ask kernel to prevent opening\n");
      printf("                    busy drives. Effect is kernel dependend.\n");
+     printf(
+         " drive_scsi_dev_family=<sr|scd|sg|default> select Linux device\n");
+     printf("                    file family to be used for (pseudo-)SCSI.\n");
      printf(
          " --drive_scsi_exclusive  try to exclusively reserve device files\n");
      printf("                    /dev/srN, /dev/scdM, /dev/stK of drive.\n");
@@ -5608,6 +5629,16 @@ set_blank:;
    } else if(strcmp(argv[i],"--drive_not_exclusive")==0) {
      /* is handled in Cdrpreskin_setup() */;
 
+   } else if(strncmp(argv[i],"drive_scsi_dev_family=",22)==0) {
+     /* is handled in Cdrpreskin_setup() */;
+     if(skin->verbosity>=Cdrskin_verbose_debuG &&
+        skin->preskin->drive_scsi_dev_family!=0)
+       ClN(fprintf(stderr,"cdrskin_debug: drive_scsi_dev_family= %d\n",
+                        skin->preskin->drive_scsi_dev_family));
+
+   } else if(strcmp(argv[i],"--drive_scsi_exclusive")==0) {
+     /* is handled in Cdrpreskin_setup() */;
+
    } else if(strncmp(argv[i],"-driveropts=",12)==0) {
      value_pt= argv[i]+12;
      goto set_driveropts;
@@ -6103,10 +6134,14 @@ int Cdrskin_create(struct CdrskiN **o, struct CdrpreskiN **preskin,
  *exit_value= 0;
 
 #ifndef Cdrskin_libburn_no_burn_preset_device_opeN
- burn_preset_device_open((*preskin)->drive_exclusive,
+ burn_preset_device_open((*preskin)->drive_exclusive
+#ifdef Cdrskin_libburn_preset_device_familY
+                         | ((*preskin)->drive_scsi_dev_family<<2)
+#endif
+                         ,
                          (*preskin)->drive_blocking,
                          (*preskin)->abort_on_busy_drive);
-#endif
+#endif /* ! Cdrskin_libburn_no_burn_preset_device_opeN */
 
  if(strlen((*preskin)->device_adr)>0) {       /* disable scan for all others */
    ClN(printf(

cdrskin/cdrskin_timestamp.h

@@ -1 +1 @@
-#define Cdrskin_timestamP "2007.03.12.155600"
+#define Cdrskin_timestamP "2007.03.14.133618"

libburn/init.c

@@ -26,9 +26,18 @@ struct libdax_msgs *libdax_messenger= NULL;
 
 int burn_running = 0;
 
-/* ts A60813 : wether to use O_EXCL and/or O_NONBLOCK in libburn/sg.c */
+/* ts A60813 : Linux: wether to use O_EXCL and/or O_NONBLOCK in libburn/sg.c */
 int burn_sg_open_o_excl = 1;
 
+/* ts A70314 : Linux: what device family to use :
+    0= default family
+    1= sr
+    2= scd
+   (3= st)
+    4= sg
+*/
+int burn_sg_use_family = 0;
+
 /* O_NONBLOCK was hardcoded in enumerate_ata() which i hardly use.
    For enumerate_sg() it seems ok.
    So it should stay default mode until enumerate_ata() without O_NONBLOCK
@@ -120,7 +129,8 @@ void burn_preset_device_open(int exclusive, int blocking, int abort_on_busy)
 	if (!burn_running)
 		return;	
 
-	burn_sg_open_o_excl= exclusive;
+	burn_sg_open_o_excl= exclusive & 3;
+	burn_sg_use_family= (exclusive >> 2) & 15;
 	burn_sg_open_o_nonblock= !blocking;
 	burn_sg_open_abort_busy= !!abort_on_busy;
 }

libburn/libburn.h

@@ -572,13 +572,20 @@ void burn_set_verbosity(int level);
     after burn_initialize() and before any bus scan. But not mandatory at all.
     Parameter value 1 enables a feature, 0 disables.  
     Default is (1,0,0). Have a good reason before you change it.
-    @param exclusive 1 = Try to open only devices which are not marked as busy
+    @param exclusive Linux only:
+                     0 = no attempt to make drive access exclusive.
+                     1 = Try to open only devices which are not marked as busy
                      and try to mark them busy if opened sucessfully. (O_EXCL)
                      There are kernels which simply don't care about O_EXCL.
                      Some have it off, some have it on, some are switchable.
                      2 = in case of a SCSI device, also try to open exclusively
                          the matching /dev/sr, /dev/scd and /dev/st .
-                     0 = no attempt to make drive access exclusive.
+                     One may select a device SCSI file family by adding
+                      0 = default family
+                      4 = /dev/sr%d
+                      8 = /dev/scd%d
+                     16 = /dev/sg%d
+                     Do not use other values !
     @param blocking  Try to wait for drives which do not open immediately but
                      also do not return an error as well. (O_NONBLOCK)
                      This might stall indefinitely with /dev/hdX hard disks.

libburn/sg-linux.c

@@ -105,16 +105,9 @@ static int linux_sg_enumerate_debug = 0;
    address parameters Host, Channel, Id, Lun and also Bus.
    E.g.: "/dev/sg%d"
 */
-/* NEW INFO: If hard disks at /dev/sr allow ioctl(CDROM_DRIVE_STATUS), they
+/* sr%d is supposed to map only CD-ROM style devices. Additionally a test
-             are in danger.
+   with ioctl(CDROM_DRIVE_STATUS) is made to assert that it is such a drive,
-             If you want it less dangerous:
-               #undef CDROM_DRIVE_STATUS
-             but then you might need linux_sg_accept_any_type = 1 which
-             is _more dangerous_.
 */
-/* !!! DO NOT SET TO sr%d UNLESS YOU PROTECTED ALL INDISPENSIBLE DEVICES
-       by chmod -rw . A test wether non-CD devices are properly excluded would
-       be well needed though. Heroic disks, scanners, etc. wanted !!! */
 static char linux_sg_device_family[80] = {"/dev/sg%d"};
 
 
@@ -171,9 +164,11 @@ static void enumerate_common(char *fname, int bus_no, int host_no,
 /* >>> ts A61115 : this needs mending. A Linux aspect shows up in cdrskin. */
 /* ts A60813 : storage objects are in libburn/init.c
    wether to use O_EXCL
+   what device family to use : 0=default, 1=sr, 2=scd, (3=st), 4=sg
    wether to use O_NOBLOCK with open(2) on devices
    wether to take O_EXCL rejection as fatal error */
 extern int burn_sg_open_o_excl;
+extern int burn_sg_use_family;
 extern int burn_sg_open_o_nonblock;
 extern int burn_sg_open_abort_busy;
 
@@ -188,6 +183,21 @@ int mmc_function_spy(char * text);
 /*            (Public functions are listed below)                           */
 /* ------------------------------------------------------------------------ */
 
+/* This installs (much too often) the device file family if one was
+   chosen explicitely by burn_preset_device_open()
+*/
+void sg_select_device_family(void)
+{
+	if (burn_sg_use_family == 1)
+		strcpy(linux_sg_device_family, "/dev/sr%d");
+	else if (burn_sg_use_family == 2)
+		strcpy(linux_sg_device_family, "/dev/scd%d");
+	else if (burn_sg_use_family == 3)
+		strcpy(linux_sg_device_family, "/dev/st%d");
+	else if (burn_sg_use_family == 4)
+		strcpy(linux_sg_device_family, "/dev/sg%d");
+}
+
 
 static int sgio_test(int fd)
 {
@@ -352,6 +362,7 @@ static int sg_open_scsi_siblings(char *path, int driveno,
 	static char tldev[][81]= {"/dev/sr%d", "/dev/scd%d", "/dev/st%d", 
 				  "/dev/sg%d", ""};
 
+        sg_select_device_family();
 	if (linux_sg_device_family[0] == 0)
 		return 1;
 
@@ -482,6 +493,8 @@ static void sg_enumerate(void)
 	int bus_no= -1, host_no= -1, channel_no= -1, target_no= -1, lun_no= -1;
 	char fname[10];
 
+        sg_select_device_family();
+
 	if (linux_sg_enumerate_debug)
 	  fprintf(stderr, "libburn_debug: linux_sg_device_family = %s\n",
 		  linux_sg_device_family);
@@ -520,6 +533,16 @@ static void sg_enumerate(void)
 			    "ioctl(SG_GET_SCSI_ID) failed, errno=%d  '%s' , ",
 			    errno, strerror(errno));
 
+			if (sgio_test(fd) == -1) {
+				if (linux_sg_enumerate_debug)
+			  		fprintf(stderr,
+				 "FATAL: sgio_test() failed: errno=%d  '%s'",
+						errno, strerror(errno));
+
+				sg_close_drive_fd(fname, -1, &fd, 0);
+	continue;
+			}
+
 #ifdef CDROM_DRIVE_STATUS
 			/* ts A61211 : not widening old acceptance range */
 			if (strcmp(linux_sg_device_family,"/dev/sg%d") != 0) {
@@ -698,6 +721,7 @@ int sg_give_next_adr(burn_drive_enumerator_t *idx,
 	if (initialize == -1)
 		return 0;
 
+        sg_select_device_family();
 	if (linux_sg_device_family[0] == 0)
 		sg_limit = 0;
 	if (linux_ata_device_family[0] == 0)