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Prepared experiments for new Linux SCSI adventures

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This commit is contained in:
Thomas Schmitt 2006-12-11 10:01:18 +00:00
parent 7bbbeca905
commit b025c6a255
2 changed files with 106 additions and 14 deletions
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2
libburn/trunk/cdrskin/cdrskin_timestamp.h
View File

@ -1 +1 @@
#define Cdrskin_timestamP "2006.12.11.095230"
#define Cdrskin_timestamP "2006.12.11.100021"

118
libburn/trunk/libburn/sg-linux.c
View File

@ -75,6 +75,50 @@ Hint: You should also look into sg-freebsd-port.c, which is a younger and
#include <scsi/scsi.h>
/* ts A61211 : preparing for exploration of recent Linux ATA adventures */
/** PORTING : Device file families for bus scanning and drive access.
Both device families must support the following ioctls:
SG_IO,
SG_GET_SCSI_ID
SCSI_IOCTL_GET_BUS_NUMBER
SCSI_IOCTL_GET_IDLUN
as well as mutual exclusively locking with open(O_EXCL).
If a device family is left empty, then it will not be used.
To avoid misunderstandings: both families are used via identical
transport methods as soon as a device file is accepted as CD drive
by the family specific function <family>_enumerate().
One difference remains throughout usage: Host,Channel,Id,Lun and Bus
address parameters of ATA devices are considered invalid.
*/
/* Set this to 1 in order to get on stderr messages from sg_enumerate() */
static int linux_sg_enumerate_debug = 0;
/* The device file family to use for (emulated) generic SCSI transport.
This must be a printf formatter with one single placeholder for int
in the range of 0 to 31 . The resulting addresses must provide SCSI
address parameters Host, Channel, Id, Lun and also Bus.
E.g.: "/dev/sg%d"
*/
static char linux_sg_device_family[80] = {"/dev/sg%d"};
/* The device file family to use for SCSI transport over ATA.
This must be a printf formatter with one single placeholder for a
_single_ char in the range of 'a' to 'z'. This placeholder _must_ be
at the end of the formatter string.
E.g. "/dev/hd%c"
*/
static char linux_ata_device_family[80] = {"/dev/hd%c"};
/* >>> Not implemented yet:
Set this to 1 in order to get on stderr messages from ata_enumerate() */
static int linux_ata_enumerate_verbous = 0;
/** PORTING : ------ libburn portable headers and definitions ----- */
#include "transport.h"
@ -285,7 +329,11 @@ static int sg_open_scsi_siblings(char *path, int driveno,
int i_host_no = -1, i_channel_no = -1, i_target_no = -1, i_lun_no = -1;
char msg[161], fname[81];
static char tldev[][81]= {"/dev/sr%d", "/dev/scd%d", "/dev/st%d", ""};
static char tldev[][81]= {"/dev/sr%d", "/dev/scd%d", "/dev/st%d",
"/dev/sg%d", ""};
if (linux_sg_device_family[0] == 0)
return 1;
if(host_no < 0 || id_no < 0 || channel_no < 0 || lun_no < 0)
return(2);
@ -293,6 +341,8 @@ static int sg_open_scsi_siblings(char *path, int driveno,
sg_release_siblings(sibling_fds, sibling_count);
for (tld = 0; tldev[tld][0] != 0; tld++) {
if (strcmp(tldev[tld], linux_sg_device_family)==0)
continue;
for (i = 0; i < 32; i++) {
sprintf(fname, tldev[tld], i);
ret = sg_obtain_scsi_adr(fname, &i_bus_no, &i_host_no,
@ -327,7 +377,7 @@ static int sg_open_scsi_siblings(char *path, int driveno,
(*sibling_count)++;
}
}
return(1);
return 1;
failed:;
sg_release_siblings(sibling_fds, sibling_count);
return 0;
@ -342,8 +392,11 @@ static void ata_enumerate(void)
int i, fd;
char fname[10];
if (linux_ata_device_family[0] == 0)
return;
for (i = 0; i < 26; i++) {
sprintf(fname, "/dev/hd%c", 'a' + i);
sprintf(fname, linux_ata_device_family, 'a' + i);
/* ts A51221 */
if (burn_drive_is_banned(fname))
continue;
@ -381,15 +434,34 @@ static void sg_enumerate(void)
int bus_no = -1;
char fname[10];
if (linux_sg_enumerate_debug)
fprintf(stderr, "libburn_debug: linux_sg_device_family = %s\n",
linux_sg_device_family);
if (linux_sg_device_family[0] == 0)
return;
for (i = 0; i < 32; i++) {
sprintf(fname, "/dev/sg%d", i);
sprintf(fname, linux_sg_device_family, i);
if (linux_sg_enumerate_debug)
fprintf(stderr, "libburn_debug: %s : ", fname);
/* ts A51221 */
if (burn_drive_is_banned(fname))
if (burn_drive_is_banned(fname)) {
if (linux_sg_enumerate_debug)
fprintf(stderr, "not in whitelist\n");
continue;
}
/* ts A60927 */
fd = sg_open_drive_fd(fname, 1);
if (fd == -1)
if (fd == -1) {
if (linux_sg_enumerate_debug)
fprintf(stderr, "open failed, errno=%d '%s'\n",
errno, strerror(errno));
continue;
}
/* found a drive */
ioctl(fd, SG_GET_SCSI_ID, &sid);
@ -401,10 +473,18 @@ static void sg_enumerate(void)
#endif
if (sg_close_drive_fd(fname, -1, &fd,
sid.scsi_type == TYPE_ROM ) <= 0)
sid.scsi_type == TYPE_ROM ) <= 0) {
if (linux_sg_enumerate_debug)
fprintf(stderr,
"cannot close properly, errno=%d '%s'\n",
errno, strerror(errno));
continue;
if (sid.scsi_type != TYPE_ROM)
}
if (sid.scsi_type != TYPE_ROM) {
if (linux_sg_enumerate_debug)
fprintf(stderr, "sid.scsi_type != TYPE_ROM\n");
continue;
}
/* ts A60927 : trying to do locking with growisofs */
if(burn_sg_open_o_excl>1) {
@ -413,6 +493,8 @@ static void sg_enumerate(void)
sid.host_no, sid.channel,
sid.scsi_id, sid.lun);
if (ret<=0) {
if (linux_sg_enumerate_debug)
fprintf(stderr, "cannot lock siblings\n");
sg_handle_busy_device(fname, 0);
continue;
}
@ -425,6 +507,10 @@ static void sg_enumerate(void)
#else
bus_no = sid.host_no;
#endif
if (linux_sg_enumerate_debug)
fprintf(stderr, "accepting as SCSI %d,%d,%d,%d bus=%d\n",
sid.host_no, sid.channel, sid.scsi_id, sid.lun,
bus_no);
enumerate_common(fname, bus_no, sid.host_no, sid.channel,
sid.scsi_id, sid.lun);
}
@ -513,13 +599,18 @@ static void enumerate_common(char *fname, int bus_no, int host_no,
int sg_give_next_adr(burn_drive_enumerator_t *idx,
char adr[], int adr_size, int initialize)
{
/* sg.h : typedef int burn_drive_enumerator_t; */
/* os-linux.h : typedef int burn_drive_enumerator_t; */
static int sg_limit = 32, ata_limit = 26;
int baseno = 0;
if (initialize == -1)
return 0;
if (linux_sg_device_family[0] == 0)
sg_limit = 0;
if (linux_ata_device_family[0] == 0)
ata_limit = 0;
if (initialize == 1)
*idx = -1;
(*idx)++;
@ -527,7 +618,7 @@ int sg_give_next_adr(burn_drive_enumerator_t *idx,
goto next_ata;
if (adr_size < 10)
return -1;
sprintf(adr, "/dev/sg%d", *idx);
sprintf(adr, linux_sg_device_family, *idx);
return 1;
next_ata:;
baseno += sg_limit;
@ -535,7 +626,7 @@ next_ata:;
goto next_nothing;
if (adr_size < 9)
return -1;
sprintf(adr, "/dev/hd%c", 'a' + (*idx - baseno));
sprintf(adr, linux_ata_device_family, 'a' + (*idx - baseno));
return 1;
next_nothing:;
baseno += ata_limit;
@ -851,14 +942,15 @@ ex:;
int sg_obtain_scsi_adr(char *path, int *bus_no, int *host_no, int *channel_no,
int *target_no, int *lun_no)
{
int fd, ret;
int fd, ret, l;
struct my_scsi_idlun {
int x;
int host_unique_id;
};
struct my_scsi_idlun idlun;
if (strncmp(path, "/dev/hd", 7) == 0
l = strlen(linux_ata_device_family) - 2;
if (l > 0 && strncmp(path, linux_ata_device_family, l) == 0
&& path[7] >= 'a' && path[7] <= 'z' && path[8] == 0)
return 0; /* on RIP 14 all hdx return SCSI adr 0,0,0,0 */