From: Kay Sievers Date: Wed, 21 Mar 2007 12:55:48 +0000 (+0100) Subject: usb_id: append target:lun to storage device serial X-Git-Tag: 174~2019 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e578a447463ec58fd543f7b978b0804d37d854dd;p=systemd usb_id: append target:lun to storage device serial Some broken usb-storage devices implement multiple luns with all the same SCSI identifiers. Append the target:lun to get unique names in /dev/disk/by-id/. --- diff --git a/extras/usb_id/usb_id.c b/extras/usb_id/usb_id.c index ba8bfdf8..50918f06 100644 --- a/extras/usb_id/usb_id.c +++ b/extras/usb_id/usb_id.c @@ -20,6 +20,7 @@ #include #include #include +#include #include "../../udev.h" @@ -55,12 +56,12 @@ void log_message(int priority, const char *format, ...) static char vendor_str[64]; static char model_str[64]; static char serial_str[MAX_SERIAL_LEN]; -static char revision_str[16]; -static char type_str[16]; +static char revision_str[64]; +static char type_str[64]; +static char instance_str[64]; static int use_usb_info; static int use_num_info; -static int export; static void set_str(char *to, const char *from, size_t count) { @@ -115,7 +116,7 @@ static void set_usb_iftype(char *to, int if_class_num, size_t len) type = "printer"; break; case 8: - type = "disk"; + type = "storage"; break; case 2: /* CDC-Control */ case 5: /* Physical */ @@ -164,48 +165,40 @@ static int set_usb_mass_storage_ifsubtype(char *to, const char *from, size_t len break; } } - strncpy(to, type, len); - to[len-1] = '\0'; + strlcpy(to, type, len); return type_num; } -static void set_scsi_type(char *to, const char *from, int count) +static void set_scsi_type(char *to, const char *from, size_t len) { int type_num; char *eptr; + char *type = "generic"; type_num = strtoul(from, &eptr, 0); if (eptr != from) { switch (type_num) { case 0: - sprintf(to, "disk"); + case 0xe: + type = "disk"; break; case 1: - sprintf(to, "tape"); + type = "tape"; break; case 4: - sprintf(to, "optical"); - break; - case 5: - sprintf(to, "cd"); - break; case 7: - sprintf(to, "optical"); - break; - case 0xe: - sprintf(to, "disk"); - break; case 0xf: - sprintf(to, "optical"); + type = "optical"; + break; + case 5: + type = "cd"; break; default: - sprintf(to, "generic"); break; } - } else { - sprintf(to, "generic"); } + strlcpy(to, type, len); } /* @@ -278,6 +271,7 @@ static int usb_id(const char *devpath) /* mass storage */ if (protocol == 6 && !use_usb_info) { struct sysfs_device *dev_scsi; + int host, bus, target, lun; /* get scsi device */ dev_scsi = sysfs_device_get_parent_with_subsystem(dev, "scsi"); @@ -285,6 +279,10 @@ static int usb_id(const char *devpath) info("unable to find parent 'scsi' device of '%s'", devpath); goto fallback; } + if (sscanf(dev_scsi->kernel, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4) { + info("invalid scsi device '%s'", dev_scsi->kernel); + goto fallback; + } /* Generic SPC-2 device */ scsi_vendor = sysfs_attr_get_value(dev_scsi->devpath, "vendor"); @@ -314,6 +312,12 @@ static int usb_id(const char *devpath) goto fallback; } set_str(revision_str, scsi_rev, sizeof(revision_str)-1); + + /* + * some broken devices have the same identifiers + * for all luns, export the target:lun number + */ + sprintf(instance_str, "%d:%d", target, lun); } fallback: @@ -363,18 +367,25 @@ int main(int argc, char **argv) int retval = 0; const char *env; char devpath[MAX_PATH_LEN]; - int option; + static int export; logging_init("usb_id"); sysfs_init(); - dbg("argc is %d", argc); + static const struct option options[] = { + { "usb-info", 0, NULL, 'u' }, + { "num-info", 0, NULL, 'n' }, + { "export", 0, NULL, 'x' }, + { "help", 0, NULL, 'h' }, + {} + }; - while ((option = getopt(argc, argv, "dnux")) != -1 ) { - if (optarg) - dbg("option '%c' arg '%s'", option, optarg); - else - dbg("option '%c'", option); + while (1) { + int option; + + option = getopt_long(argc, argv, "nuxh", options, NULL); + if (option == -1) + break; switch (option) { case 'n': @@ -387,10 +398,15 @@ int main(int argc, char **argv) case 'x': export = 1; break; + case 'h': + printf("Usage: usb_id [--usb-info] [--num-info] [--export] [--help]\n" + " --usb-info use usb strings instead\n" + " --num-info use numerical values\n" + " --export print values as environemt keys\n" + " --help print this help text\n\n"); default: - info("Unknown or bad option '%c' (0x%x)", option, option); retval = 1; - break; + goto exit; } } @@ -398,7 +414,7 @@ int main(int argc, char **argv) if (env != NULL) strlcpy(devpath, env, sizeof(devpath)); else { - if (optind == argc) { + if (argv[optind] == NULL) { fprintf(stderr, "No device specified\n"); retval = 1; goto exit; @@ -409,28 +425,33 @@ int main(int argc, char **argv) retval = usb_id(devpath); if (retval == 0) { + char serial[256]; + + strlcpy(serial, vendor_str, sizeof(serial)); + strlcat(serial, "_", sizeof(serial)); + strlcat(serial, model_str, sizeof(serial)); + if (serial_str[0] != '\0') { + strlcat(serial, "_", sizeof(serial)); + strlcat(serial, serial_str, sizeof(serial)); + } + if (instance_str[0] != '\0') { + strlcat(serial, "-", sizeof(serial)); + strlcat(serial, instance_str, sizeof(serial)); + } + if (export) { printf("ID_VENDOR=%s\n", vendor_str); printf("ID_MODEL=%s\n", model_str); printf("ID_REVISION=%s\n", revision_str); - if (serial_str[0] == '\0') { - printf("ID_SERIAL=%s_%s\n", - vendor_str, model_str); - } else { - printf("ID_SERIAL=%s_%s_%s\n", - vendor_str, model_str, serial_str); - } + printf("ID_SERIAL=%s\n", serial); + if (serial_str[0] != '\0') + printf("ID_SERIAL_SHORT=%s\n", serial_str); printf("ID_TYPE=%s\n", type_str); + if (instance_str[0] != '\0') + printf("ID_INSTANCE=%s\n", instance_str); printf("ID_BUS=usb\n"); - } else { - if (serial_str[0] == '\0') { - printf("%s_%s\n", - vendor_str, model_str); - } else { - printf("%s_%s_%s\n", - vendor_str, model_str, serial_str); - } - } + } else + printf("%s\n", serial); } exit: