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Add ability to retrieve SCSI tuple for a name and/or fake one up. This

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helps programs that want to be cd-record compatible. In particular to
parameters were added to cdio_get_arg, "scsi-tuple", and
"scsi-tuple-linux".

Code from Thomas Schmitt.
This commit is contained in:
R. Bernstein
2009-12-31 18:51:50 -05:00
parent 7e14578ffe
commit cf882cfd20
4 changed files with 118 additions and 13 deletions
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76
lib/driver/gnu_linux.c
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@@ -385,6 +385,10 @@ get_arg_linux (void *env, const char key[])
case _AM_NONE:
return "no access method";
}
} else if (!strcmp (key, "scsi-tuple")) {
return _obj->gen.scsi_tuple;
} else if (!strcmp (key, "scsi-tuple-linux")) {
return _obj->gen.scsi_tuple;
}
return NULL;
}
@@ -1548,6 +1552,77 @@ close_tray_linux (const char *psz_device)
#endif /*HAVE_LINUX_CDROM*/
}
/*!
Produce a text composed from the system SCSI address tuple according to
habits of Linux 2.4 and 2.6 : "Bus,Host,Channel,Target,Lun" and store
it in generic_img_private_t.scsi_tuple.
To be accessed via cdio_get_arg("scsi-tuple-linux") or ("scsi-tuple").
Drivers which implement this code have to return 5 valid decimal numbers
separated by comma, or empty text if no such numbers are available.
@return 1=success , 0=failure
*/
static int
set_scsi_tuple_linux(_img_private_t *env)
{
int bus_no = -1, host_no = -1, channel_no = -1, target_no = -1, lun_no = -1;
int ret, i;
char tuple[160], hdx[10];
#ifdef SCSI_IOCTL_GET_IDLUN
struct my_scsi_idlun {
int x;
int host_unique_id;
};
struct my_scsi_idlun idlun;
#endif
struct stat stbuf, env_stbuf;
/* Check whether this is a hdX and declare tuple unavailable.
/dev/hdX is traditionally for IDE drives and the ioctls here traditionally
return ok and all 0s for all IDE drives. So the tuples are no unique ids.
*/
if (fstat(env->gen.fd, &env_stbuf) == -1)
goto no_tuple;
strcpy(hdx, "/dev/hdX");
for (i = 'a'; i <= 'z'; i++) {
hdx[7] = i;
if (stat(hdx, &stbuf) == -1)
continue;
if (env_stbuf.st_dev == stbuf.st_dev && env_stbuf.st_ino == stbuf.st_ino)
goto no_tuple;
}
#ifdef SCSI_IOCTL_GET_BUS_NUMBER
if (ioctl(env->gen.fd, SCSI_IOCTL_GET_BUS_NUMBER, &bus_no) == -1)
bus_no = -1;
#endif
#ifdef SCSI_IOCTL_GET_IDLUN
/* http://www.tldp.org/HOWTO/SCSI-Generic-HOWTO/scsi_g_idlun.html */
ret = ioctl(env->gen.fd, SCSI_IOCTL_GET_IDLUN, &idlun);
if (ret != -1) {
host_no= (idlun.x >> 24) & 255;
channel_no= (idlun.x >> 16) & 255;
target_no= (idlun.x) & 255;
lun_no= (idlun.x >> 8) & 255;
}
#endif
if (env->gen.scsi_tuple != NULL)
free (env->gen.scsi_tuple);
env->gen.scsi_tuple = NULL;
if (bus_no < 0 || host_no < 0 || channel_no < 0 || target_no < 0 ||
lun_no < 0) {
no_tuple:;
env->gen.scsi_tuple = strdup("");
return 0;
}
sprintf(tuple, "%d,%d,%d,%d,%d",
bus_no, host_no, channel_no, target_no, lun_no);
env->gen.scsi_tuple = strdup(tuple);
return 1;
}
/*!
Initialization routine. This is the only thing that doesn't
get called via a function pointer. In fact *we* are the
@@ -1685,6 +1760,7 @@ cdio_open_am_linux (const char *psz_orig_source, const char *access_mode)
else
open_access_mode |= O_RDONLY;
if (cdio_generic_init(_data, open_access_mode)) {
set_scsi_tuple_linux(_data);
return ret;
} else {
cdio_generic_free (_data);