+++ /dev/null
-/*
- * compose persistent device path
- *
- * Copyright (C) 2009-2011 Kay Sievers <kay@vrfy.org>
- *
- * Logic based on Hannes Reinecke's shell script.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <unistd.h>
-#include <string.h>
-#include <ctype.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <dirent.h>
-#include <getopt.h>
-
-#include "udev.h"
-
-_printf_(2,3)
-static int path_prepend(char **path, const char *fmt, ...) {
- va_list va;
- char *pre;
- int err = 0;
-
- va_start(va, fmt);
- err = vasprintf(&pre, fmt, va);
- va_end(va);
- if (err < 0)
- goto out;
-
- if (*path != NULL) {
- char *new;
-
- err = asprintf(&new, "%s-%s", pre, *path);
- free(pre);
- if (err < 0)
- goto out;
- free(*path);
- *path = new;
- } else {
- *path = pre;
- }
-out:
- return err;
-}
-
-/*
-** Linux only supports 32 bit luns.
-** See drivers/scsi/scsi_scan.c::scsilun_to_int() for more details.
-*/
-static int format_lun_number(struct udev_device *dev, char **path) {
- unsigned long lun = strtoul(udev_device_get_sysnum(dev), NULL, 10);
-
- /* address method 0, peripheral device addressing with bus id of zero */
- if (lun < 256)
- return path_prepend(path, "lun-%lu", lun);
- /* handle all other lun addressing methods by using a variant of the original lun format */
- return path_prepend(path, "lun-0x%04lx%04lx00000000", lun & 0xffff, (lun >> 16) & 0xffff);
-}
-
-static struct udev_device *skip_subsystem(struct udev_device *dev, const char *subsys) {
- struct udev_device *parent = dev;
-
- while (parent != NULL) {
- const char *subsystem;
-
- subsystem = udev_device_get_subsystem(parent);
- if (subsystem == NULL || !streq(subsystem, subsys))
- break;
- dev = parent;
- parent = udev_device_get_parent(parent);
- }
- return dev;
-}
-
-static struct udev_device *handle_scsi_fibre_channel(struct udev_device *parent, char **path) {
- struct udev *udev = udev_device_get_udev(parent);
- struct udev_device *targetdev;
- struct udev_device *fcdev = NULL;
- const char *port;
- char *lun = NULL;
-
- targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
- if (targetdev == NULL)
- return NULL;
-
- fcdev = udev_device_new_from_subsystem_sysname(udev, "fc_transport", udev_device_get_sysname(targetdev));
- if (fcdev == NULL)
- return NULL;
- port = udev_device_get_sysattr_value(fcdev, "port_name");
- if (port == NULL) {
- parent = NULL;
- goto out;
- }
-
- format_lun_number(parent, &lun);
- path_prepend(path, "fc-%s-%s", port, lun);
- if (lun)
- free(lun);
-out:
- udev_device_unref(fcdev);
- return parent;
-}
-
-static struct udev_device *handle_scsi_sas_wide_port(struct udev_device *parent, char **path) {
- struct udev *udev = udev_device_get_udev(parent);
- struct udev_device *targetdev;
- struct udev_device *target_parent;
- struct udev_device *sasdev;
- const char *sas_address;
- char *lun = NULL;
-
- targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
- if (targetdev == NULL)
- return NULL;
-
- target_parent = udev_device_get_parent(targetdev);
- if (target_parent == NULL)
- return NULL;
-
- sasdev = udev_device_new_from_subsystem_sysname(udev, "sas_device",
- udev_device_get_sysname(target_parent));
- if (sasdev == NULL)
- return NULL;
-
- sas_address = udev_device_get_sysattr_value(sasdev, "sas_address");
- if (sas_address == NULL) {
- parent = NULL;
- goto out;
- }
-
- format_lun_number(parent, &lun);
- path_prepend(path, "sas-%s-%s", sas_address, lun);
- if (lun)
- free(lun);
-out:
- udev_device_unref(sasdev);
- return parent;
-}
-
-static struct udev_device *handle_scsi_sas(struct udev_device *parent, char **path)
-{
- struct udev *udev = udev_device_get_udev(parent);
- struct udev_device *targetdev;
- struct udev_device *target_parent;
- struct udev_device *port;
- struct udev_device *expander;
- struct udev_device *target_sasdev = NULL;
- struct udev_device *expander_sasdev = NULL;
- struct udev_device *port_sasdev = NULL;
- const char *sas_address = NULL;
- const char *phy_id;
- const char *phy_count;
- char *lun = NULL;
-
- targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
- if (targetdev == NULL)
- return NULL;
-
- target_parent = udev_device_get_parent(targetdev);
- if (target_parent == NULL)
- return NULL;
-
- /* Get sas device */
- target_sasdev = udev_device_new_from_subsystem_sysname(udev,
- "sas_device", udev_device_get_sysname(target_parent));
- if (target_sasdev == NULL)
- return NULL;
-
- /* The next parent is sas port */
- port = udev_device_get_parent(target_parent);
- if (port == NULL) {
- parent = NULL;
- goto out;
- }
-
- /* Get port device */
- port_sasdev = udev_device_new_from_subsystem_sysname(udev,
- "sas_port", udev_device_get_sysname(port));
-
- phy_count = udev_device_get_sysattr_value(port_sasdev, "num_phys");
- if (phy_count == NULL) {
- parent = NULL;
- goto out;
- }
-
- /* Check if we are simple disk */
- if (strncmp(phy_count, "1", 2) != 0) {
- parent = handle_scsi_sas_wide_port(parent, path);
- goto out;
- }
-
- /* Get connected phy */
- phy_id = udev_device_get_sysattr_value(target_sasdev, "phy_identifier");
- if (phy_id == NULL) {
- parent = NULL;
- goto out;
- }
-
- /* The port's parent is either hba or expander */
- expander = udev_device_get_parent(port);
- if (expander == NULL) {
- parent = NULL;
- goto out;
- }
-
- /* Get expander device */
- expander_sasdev = udev_device_new_from_subsystem_sysname(udev,
- "sas_device", udev_device_get_sysname(expander));
- if (expander_sasdev != NULL) {
- /* Get expander's address */
- sas_address = udev_device_get_sysattr_value(expander_sasdev,
- "sas_address");
- if (sas_address == NULL) {
- parent = NULL;
- goto out;
- }
- }
-
- format_lun_number(parent, &lun);
- if (sas_address)
- path_prepend(path, "sas-exp%s-phy%s-%s", sas_address, phy_id, lun);
- else
- path_prepend(path, "sas-phy%s-%s", phy_id, lun);
-
- if (lun)
- free(lun);
-out:
- udev_device_unref(target_sasdev);
- udev_device_unref(expander_sasdev);
- udev_device_unref(port_sasdev);
- return parent;
-}
-
-static struct udev_device *handle_scsi_iscsi(struct udev_device *parent, char **path) {
- struct udev *udev = udev_device_get_udev(parent);
- struct udev_device *transportdev;
- struct udev_device *sessiondev = NULL;
- const char *target;
- char *connname;
- struct udev_device *conndev = NULL;
- const char *addr;
- const char *port;
- char *lun = NULL;
-
- /* find iscsi session */
- transportdev = parent;
- for (;;) {
- transportdev = udev_device_get_parent(transportdev);
- if (transportdev == NULL)
- return NULL;
- if (startswith(udev_device_get_sysname(transportdev), "session"))
- break;
- }
-
- /* find iscsi session device */
- sessiondev = udev_device_new_from_subsystem_sysname(udev, "iscsi_session", udev_device_get_sysname(transportdev));
- if (sessiondev == NULL)
- return NULL;
- target = udev_device_get_sysattr_value(sessiondev, "targetname");
- if (target == NULL) {
- parent = NULL;
- goto out;
- }
-
- if (asprintf(&connname, "connection%s:0", udev_device_get_sysnum(transportdev)) < 0) {
- parent = NULL;
- goto out;
- }
- conndev = udev_device_new_from_subsystem_sysname(udev, "iscsi_connection", connname);
- free(connname);
- if (conndev == NULL) {
- parent = NULL;
- goto out;
- }
- addr = udev_device_get_sysattr_value(conndev, "persistent_address");
- port = udev_device_get_sysattr_value(conndev, "persistent_port");
- if (addr == NULL || port == NULL) {
- parent = NULL;
- goto out;
- }
-
- format_lun_number(parent, &lun);
- path_prepend(path, "ip-%s:%s-iscsi-%s-%s", addr, port, target, lun);
- if (lun)
- free(lun);
-out:
- udev_device_unref(sessiondev);
- udev_device_unref(conndev);
- return parent;
-}
-
-static struct udev_device *handle_scsi_default(struct udev_device *parent, char **path) {
- struct udev_device *hostdev;
- int host, bus, target, lun;
- const char *name;
- char *base;
- char *pos;
- DIR *dir;
- struct dirent *dent;
- int basenum;
-
- hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
- if (hostdev == NULL)
- return NULL;
-
- name = udev_device_get_sysname(parent);
- if (sscanf(name, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4)
- return NULL;
-
- /*
- * Rebase host offset to get the local relative number
- *
- * Note: This is by definition racy, unreliable and too simple.
- * Please do not copy this model anywhere. It's just a left-over
- * from the time we had no idea how things should look like in
- * the end.
- *
- * Making assumptions about a global in-kernel counter and use
- * that to calculate a local offset is a very broken concept. It
- * can only work as long as things are in strict order.
- *
- * The kernel needs to export the instance/port number of a
- * controller directly, without the need for rebase magic like
- * this. Manual driver unbind/bind, parallel hotplug/unplug will
- * get into the way of this "I hope it works" logic.
- */
- basenum = -1;
- base = strdup(udev_device_get_syspath(hostdev));
- if (base == NULL)
- return NULL;
- pos = strrchr(base, '/');
- if (pos == NULL) {
- parent = NULL;
- goto out;
- }
- pos[0] = '\0';
- dir = opendir(base);
- if (dir == NULL) {
- parent = NULL;
- goto out;
- }
- for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
- char *rest;
- int i;
-
- if (dent->d_name[0] == '.')
- continue;
- if (dent->d_type != DT_DIR && dent->d_type != DT_LNK)
- continue;
- if (!startswith(dent->d_name, "host"))
- continue;
- i = strtoul(&dent->d_name[4], &rest, 10);
- if (rest[0] != '\0')
- continue;
- /*
- * find the smallest number; the host really needs to export its
- * own instance number per parent device; relying on the global host
- * enumeration and plainly rebasing the numbers sounds unreliable
- */
- if (basenum == -1 || i < basenum)
- basenum = i;
- }
- closedir(dir);
- if (basenum == -1) {
- parent = NULL;
- goto out;
- }
- host -= basenum;
-
- path_prepend(path, "scsi-%u:%u:%u:%u", host, bus, target, lun);
-out:
- free(base);
- return hostdev;
-}
-
-static struct udev_device *handle_scsi_hyperv(struct udev_device *parent, char **path) {
- struct udev_device *hostdev;
- struct udev_device *vmbusdev;
- const char *guid_str;
- char *lun = NULL;
- char guid[38];
- size_t i, k;
-
- hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
- if (!hostdev)
- return NULL;
-
- vmbusdev = udev_device_get_parent(hostdev);
- if (!vmbusdev)
- return NULL;
-
- guid_str = udev_device_get_sysattr_value(vmbusdev, "device_id");
- if (!guid_str)
- return NULL;
-
- if (strlen(guid_str) < 37 || guid_str[0] != '{' || guid_str[36] != '}')
- return NULL;
-
- for (i = 1, k = 0; i < 36; i++) {
- if (guid_str[i] == '-')
- continue;
- guid[k++] = guid_str[i];
- }
- guid[k] = '\0';
-
- format_lun_number(parent, &lun);
- path_prepend(path, "vmbus-%s-%s", guid, lun);
- free(lun);
- return parent;
-}
-
-static struct udev_device *handle_scsi(struct udev_device *parent, char **path, bool *supported_parent) {
- const char *devtype;
- const char *name;
- const char *id;
-
- devtype = udev_device_get_devtype(parent);
- if (devtype == NULL || !streq(devtype, "scsi_device"))
- return parent;
-
- /* firewire */
- id = udev_device_get_sysattr_value(parent, "ieee1394_id");
- if (id != NULL) {
- parent = skip_subsystem(parent, "scsi");
- path_prepend(path, "ieee1394-0x%s", id);
- *supported_parent = true;
- goto out;
- }
-
- /* scsi sysfs does not have a "subsystem" for the transport */
- name = udev_device_get_syspath(parent);
-
- if (strstr(name, "/rport-") != NULL) {
- parent = handle_scsi_fibre_channel(parent, path);
- *supported_parent = true;
- goto out;
- }
-
- if (strstr(name, "/end_device-") != NULL) {
- parent = handle_scsi_sas(parent, path);
- *supported_parent = true;
- goto out;
- }
-
- if (strstr(name, "/session") != NULL) {
- parent = handle_scsi_iscsi(parent, path);
- *supported_parent = true;
- goto out;
- }
-
- /*
- * We do not support the ATA transport class, it uses global counters
- * to name the ata devices which numbers spread across multiple
- * controllers.
- *
- * The real link numbers are not exported. Also, possible chains of ports
- * behind port multipliers cannot be composed that way.
- *
- * Until all that is solved at the kernel level, there are no by-path/
- * links for ATA devices.
- */
- if (strstr(name, "/ata") != NULL) {
- parent = NULL;
- goto out;
- }
-
- if (strstr(name, "/vmbus_") != NULL) {
- parent = handle_scsi_hyperv(parent, path);
- goto out;
- }
-
- parent = handle_scsi_default(parent, path);
-out:
- return parent;
-}
-
-static struct udev_device *handle_cciss(struct udev_device *parent, char **path) {
- const char *str;
- unsigned int controller, disk;
-
- str = udev_device_get_sysname(parent);
- if (sscanf(str, "c%ud%u%*s", &controller, &disk) != 2)
- return NULL;
-
- path_prepend(path, "cciss-disk%u", disk);
- parent = skip_subsystem(parent, "cciss");
- return parent;
-}
-
-static void handle_scsi_tape(struct udev_device *dev, char **path) {
- const char *name;
-
- /* must be the last device in the syspath */
- if (*path != NULL)
- return;
-
- name = udev_device_get_sysname(dev);
- if (startswith(name, "nst") && strchr("lma", name[3]) != NULL)
- path_prepend(path, "nst%c", name[3]);
- else if (startswith(name, "st") && strchr("lma", name[2]) != NULL)
- path_prepend(path, "st%c", name[2]);
-}
-
-static struct udev_device *handle_usb(struct udev_device *parent, char **path) {
- const char *devtype;
- const char *str;
- const char *port;
-
- devtype = udev_device_get_devtype(parent);
- if (devtype == NULL)
- return parent;
- if (!streq(devtype, "usb_interface") && !streq(devtype, "usb_device"))
- return parent;
-
- str = udev_device_get_sysname(parent);
- port = strchr(str, '-');
- if (port == NULL)
- return parent;
- port++;
-
- parent = skip_subsystem(parent, "usb");
- path_prepend(path, "usb-0:%s", port);
- return parent;
-}
-
-static struct udev_device *handle_bcma(struct udev_device *parent, char **path) {
- const char *sysname;
- unsigned int core;
-
- sysname = udev_device_get_sysname(parent);
- if (sscanf(sysname, "bcma%*u:%u", &core) != 1)
- return NULL;
-
- path_prepend(path, "bcma-%u", core);
- return parent;
-}
-
-static struct udev_device *handle_ccw(struct udev_device *parent, struct udev_device *dev, char **path) {
- struct udev_device *scsi_dev;
-
- scsi_dev = udev_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device");
- if (scsi_dev != NULL) {
- const char *wwpn;
- const char *lun;
- const char *hba_id;
-
- hba_id = udev_device_get_sysattr_value(scsi_dev, "hba_id");
- wwpn = udev_device_get_sysattr_value(scsi_dev, "wwpn");
- lun = udev_device_get_sysattr_value(scsi_dev, "fcp_lun");
- if (hba_id != NULL && lun != NULL && wwpn != NULL) {
- path_prepend(path, "ccw-%s-zfcp-%s:%s", hba_id, wwpn, lun);
- goto out;
- }
- }
-
- path_prepend(path, "ccw-%s", udev_device_get_sysname(parent));
-out:
- parent = skip_subsystem(parent, "ccw");
- return parent;
-}
-
-static int builtin_path_id(struct udev_device *dev, int argc, char *argv[], bool test) {
- struct udev_device *parent;
- char *path = NULL;
- bool supported_transport = false;
- bool supported_parent = false;
-
- /* S390 ccw bus */
- parent = udev_device_get_parent_with_subsystem_devtype(dev, "ccw", NULL);
- if (parent != NULL) {
- handle_ccw(parent, dev, &path);
- goto out;
- }
-
- /* walk up the chain of devices and compose path */
- parent = dev;
- while (parent != NULL) {
- const char *subsys;
-
- subsys = udev_device_get_subsystem(parent);
- if (subsys == NULL) {
- ;
- } else if (streq(subsys, "scsi_tape")) {
- handle_scsi_tape(parent, &path);
- } else if (streq(subsys, "scsi")) {
- parent = handle_scsi(parent, &path, &supported_parent);
- supported_transport = true;
- } else if (streq(subsys, "cciss")) {
- parent = handle_cciss(parent, &path);
- supported_transport = true;
- } else if (streq(subsys, "usb")) {
- parent = handle_usb(parent, &path);
- supported_transport = true;
- } else if (streq(subsys, "bcma")) {
- parent = handle_bcma(parent, &path);
- supported_transport = true;
- } else if (streq(subsys, "serio")) {
- path_prepend(&path, "serio-%s", udev_device_get_sysnum(parent));
- parent = skip_subsystem(parent, "serio");
- } else if (streq(subsys, "pci")) {
- path_prepend(&path, "pci-%s", udev_device_get_sysname(parent));
- parent = skip_subsystem(parent, "pci");
- supported_parent = true;
- } else if (streq(subsys, "platform")) {
- path_prepend(&path, "platform-%s", udev_device_get_sysname(parent));
- parent = skip_subsystem(parent, "platform");
- supported_transport = true;
- supported_parent = true;
- } else if (streq(subsys, "acpi")) {
- path_prepend(&path, "acpi-%s", udev_device_get_sysname(parent));
- parent = skip_subsystem(parent, "acpi");
- supported_parent = true;
- } else if (streq(subsys, "xen")) {
- path_prepend(&path, "xen-%s", udev_device_get_sysname(parent));
- parent = skip_subsystem(parent, "xen");
- supported_parent = true;
- } else if (streq(subsys, "scm")) {
- path_prepend(&path, "scm-%s", udev_device_get_sysname(parent));
- parent = skip_subsystem(parent, "scm");
- supported_transport = true;
- supported_parent = true;
- }
-
- parent = udev_device_get_parent(parent);
- }
-
- /*
- * Do not return devices with an unknown parent device type. They
- * might produce conflicting IDs if the parent does not provide a
- * unique and predictable name.
- */
- if (!supported_parent) {
- free(path);
- path = NULL;
- }
-
- /*
- * Do not return block devices without a well-known transport. Some
- * devices do not expose their buses and do not provide a unique
- * and predictable name that way.
- */
- if (streq(udev_device_get_subsystem(dev), "block") && !supported_transport) {
- free(path);
- path = NULL;
- }
-
-out:
- if (path != NULL) {
- char tag[UTIL_NAME_SIZE];
- size_t i;
- const char *p;
-
- /* compose valid udev tag name */
- for (p = path, i = 0; *p; p++) {
- if ((*p >= '0' && *p <= '9') ||
- (*p >= 'A' && *p <= 'Z') ||
- (*p >= 'a' && *p <= 'z') ||
- *p == '-') {
- tag[i++] = *p;
- continue;
- }
-
- /* skip all leading '_' */
- if (i == 0)
- continue;
-
- /* avoid second '_' */
- if (tag[i-1] == '_')
- continue;
-
- tag[i++] = '_';
- }
- /* strip trailing '_' */
- while (i > 0 && tag[i-1] == '_')
- i--;
- tag[i] = '\0';
-
- udev_builtin_add_property(dev, test, "ID_PATH", path);
- udev_builtin_add_property(dev, test, "ID_PATH_TAG", tag);
- free(path);
- return EXIT_SUCCESS;
- }
- return EXIT_FAILURE;
-}
-
-const struct udev_builtin udev_builtin_path_id = {
- .name = "path_id",
- .cmd = builtin_path_id,
- .help = "Compose persistent device path",
- .run_once = true,
-};
~ianmdlvl / elogind.git / blobdiff