683 lines
24 KiB
C
683 lines
24 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* compose persistent device path
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*
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* Logic based on Hannes Reinecke's shell script.
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*/
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "dirent-util.h"
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#include "fd-util.h"
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#include "libudev-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "sysexits.h"
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#include "udev-builtin.h"
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_printf_(2,3)
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static void path_prepend(char **path, const char *fmt, ...) {
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va_list va;
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_cleanup_free_ char *pre = NULL;
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int r;
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va_start(va, fmt);
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r = vasprintf(&pre, fmt, va);
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va_end(va);
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if (r < 0) {
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log_oom();
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exit(EX_OSERR);
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}
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if (*path) {
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char *new;
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new = strjoin(pre, "-", *path);
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if (!new) {
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log_oom();
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exit(EX_OSERR);
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}
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free_and_replace(*path, new);
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} else
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*path = TAKE_PTR(pre);
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}
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/*
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** Linux only supports 32 bit luns.
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** See drivers/scsi/scsi_scan.c::scsilun_to_int() for more details.
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*/
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static int format_lun_number(sd_device *dev, char **path) {
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const char *sysnum;
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unsigned long lun;
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int r;
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r = sd_device_get_sysnum(dev, &sysnum);
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if (r < 0)
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return r;
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if (!sysnum)
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return -ENOENT;
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lun = strtoul(sysnum, NULL, 10);
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if (lun < 256)
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/* address method 0, peripheral device addressing with bus id of zero */
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path_prepend(path, "lun-%lu", lun);
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else
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/* handle all other lun addressing methods by using a variant of the original lun format */
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path_prepend(path, "lun-0x%04lx%04lx00000000", lun & 0xffff, (lun >> 16) & 0xffff);
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return 0;
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}
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static sd_device *skip_subsystem(sd_device *dev, const char *subsys) {
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sd_device *parent;
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assert(dev);
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assert(subsys);
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for (parent = dev; ; ) {
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const char *subsystem;
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if (sd_device_get_subsystem(parent, &subsystem) < 0)
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break;
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if (!streq(subsystem, subsys))
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break;
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dev = parent;
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if (sd_device_get_parent(dev, &parent) < 0)
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break;
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}
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return dev;
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}
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static sd_device *handle_scsi_fibre_channel(sd_device *parent, char **path) {
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sd_device *targetdev;
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_cleanup_(sd_device_unrefp) sd_device *fcdev = NULL;
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const char *port, *sysname;
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_cleanup_free_ char *lun = NULL;
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assert(parent);
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assert(path);
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if (sd_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target", &targetdev) < 0)
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return NULL;
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if (sd_device_get_sysname(targetdev, &sysname) < 0)
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return NULL;
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if (sd_device_new_from_subsystem_sysname(&fcdev, "fc_transport", sysname) < 0)
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return NULL;
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if (sd_device_get_sysattr_value(fcdev, "port_name", &port) < 0)
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return NULL;
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format_lun_number(parent, &lun);
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path_prepend(path, "fc-%s-%s", port, lun);
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return parent;
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}
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static sd_device *handle_scsi_sas_wide_port(sd_device *parent, char **path) {
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sd_device *targetdev, *target_parent;
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_cleanup_(sd_device_unrefp) sd_device *sasdev = NULL;
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const char *sas_address, *sysname;
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_cleanup_free_ char *lun = NULL;
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assert(parent);
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assert(path);
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if (sd_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target", &targetdev) < 0)
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return NULL;
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if (sd_device_get_parent(targetdev, &target_parent) < 0)
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return NULL;
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if (sd_device_get_sysname(target_parent, &sysname) < 0)
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return NULL;
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if (sd_device_new_from_subsystem_sysname(&sasdev, "sas_device", sysname) < 0)
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return NULL;
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if (sd_device_get_sysattr_value(sasdev, "sas_address", &sas_address) < 0)
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return NULL;
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format_lun_number(parent, &lun);
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path_prepend(path, "sas-%s-%s", sas_address, lun);
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return parent;
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}
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static sd_device *handle_scsi_sas(sd_device *parent, char **path) {
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sd_device *targetdev, *target_parent, *port, *expander;
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_cleanup_(sd_device_unrefp) sd_device *target_sasdev = NULL, *expander_sasdev = NULL, *port_sasdev = NULL;
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const char *sas_address = NULL;
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const char *phy_id;
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const char *phy_count, *sysname;
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_cleanup_free_ char *lun = NULL;
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assert(parent);
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assert(path);
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if (sd_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target", &targetdev) < 0)
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return NULL;
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if (sd_device_get_parent(targetdev, &target_parent) < 0)
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return NULL;
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if (sd_device_get_sysname(target_parent, &sysname) < 0)
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return NULL;
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/* Get sas device */
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if (sd_device_new_from_subsystem_sysname(&target_sasdev, "sas_device", sysname) < 0)
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return NULL;
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/* The next parent is sas port */
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if (sd_device_get_parent(target_parent, &port) < 0)
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return NULL;
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if (sd_device_get_sysname(port, &sysname) < 0)
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return NULL;
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/* Get port device */
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if (sd_device_new_from_subsystem_sysname(&port_sasdev, "sas_port", sysname) < 0)
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return NULL;
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if (sd_device_get_sysattr_value(port_sasdev, "num_phys", &phy_count) < 0)
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return NULL;
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/* Check if we are simple disk */
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if (strncmp(phy_count, "1", 2) != 0)
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return handle_scsi_sas_wide_port(parent, path);
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/* Get connected phy */
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if (sd_device_get_sysattr_value(target_sasdev, "phy_identifier", &phy_id) < 0)
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return NULL;
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/* The port's parent is either hba or expander */
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if (sd_device_get_parent(port, &expander) < 0)
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return NULL;
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if (sd_device_get_sysname(expander, &sysname) < 0)
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return NULL;
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/* Get expander device */
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if (sd_device_new_from_subsystem_sysname(&expander_sasdev, "sas_device", sysname) >= 0) {
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/* Get expander's address */
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if (sd_device_get_sysattr_value(expander_sasdev, "sas_address", &sas_address) < 0)
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return NULL;
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}
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format_lun_number(parent, &lun);
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if (sas_address)
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path_prepend(path, "sas-exp%s-phy%s-%s", sas_address, phy_id, lun);
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else
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path_prepend(path, "sas-phy%s-%s", phy_id, lun);
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return parent;
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}
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static sd_device *handle_scsi_iscsi(sd_device *parent, char **path) {
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sd_device *transportdev;
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_cleanup_(sd_device_unrefp) sd_device *sessiondev = NULL, *conndev = NULL;
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const char *target, *connname, *addr, *port;
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_cleanup_free_ char *lun = NULL;
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const char *sysname, *sysnum;
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assert(parent);
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assert(path);
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/* find iscsi session */
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for (transportdev = parent; ; ) {
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if (sd_device_get_parent(transportdev, &transportdev) < 0)
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return NULL;
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if (sd_device_get_sysname(transportdev, &sysname) < 0)
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return NULL;
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if (startswith(sysname, "session"))
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break;
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}
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/* find iscsi session device */
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if (sd_device_new_from_subsystem_sysname(&sessiondev, "iscsi_session", sysname) < 0)
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return NULL;
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if (sd_device_get_sysattr_value(sessiondev, "targetname", &target) < 0)
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return NULL;
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if (sd_device_get_sysnum(transportdev, &sysnum) < 0 || !sysnum)
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return NULL;
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connname = strjoina("connection", sysnum, ":0");
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if (sd_device_new_from_subsystem_sysname(&conndev, "iscsi_connection", connname) < 0)
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return NULL;
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if (sd_device_get_sysattr_value(conndev, "persistent_address", &addr) < 0)
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return NULL;
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if (sd_device_get_sysattr_value(conndev, "persistent_port", &port) < 0)
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return NULL;
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format_lun_number(parent, &lun);
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path_prepend(path, "ip-%s:%s-iscsi-%s-%s", addr, port, target, lun);
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return parent;
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}
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static sd_device *handle_scsi_ata(sd_device *parent, char **path) {
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sd_device *targetdev, *target_parent;
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_cleanup_(sd_device_unrefp) sd_device *atadev = NULL;
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const char *port_no, *sysname;
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assert(parent);
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assert(path);
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if (sd_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host", &targetdev) < 0)
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return NULL;
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if (sd_device_get_parent(targetdev, &target_parent) < 0)
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return NULL;
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if (sd_device_get_sysname(target_parent, &sysname) < 0)
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return NULL;
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if (sd_device_new_from_subsystem_sysname(&atadev, "ata_port", sysname) < 0)
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return NULL;
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if (sd_device_get_sysattr_value(atadev, "port_no", &port_no) < 0)
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return NULL;
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path_prepend(path, "ata-%s", port_no);
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return parent;
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}
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static sd_device *handle_scsi_default(sd_device *parent, char **path) {
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sd_device *hostdev;
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int host, bus, target, lun;
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const char *name, *base, *pos;
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_cleanup_closedir_ DIR *dir = NULL;
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struct dirent *dent;
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int basenum = -1;
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assert(parent);
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assert(path);
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if (sd_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host", &hostdev) < 0)
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return NULL;
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if (sd_device_get_sysname(parent, &name) < 0)
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return NULL;
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if (sscanf(name, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4)
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return NULL;
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/*
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* Rebase host offset to get the local relative number
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*
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* Note: This is by definition racy, unreliable and too simple.
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* Please do not copy this model anywhere. It's just a left-over
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* from the time we had no idea how things should look like in
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* the end.
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*
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* Making assumptions about a global in-kernel counter and use
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* that to calculate a local offset is a very broken concept. It
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* can only work as long as things are in strict order.
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*
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* The kernel needs to export the instance/port number of a
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* controller directly, without the need for rebase magic like
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* this. Manual driver unbind/bind, parallel hotplug/unplug will
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* get into the way of this "I hope it works" logic.
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*/
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if (sd_device_get_syspath(hostdev, &base) < 0)
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return NULL;
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pos = strrchr(base, '/');
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if (!pos)
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return NULL;
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base = strndupa(base, pos - base);
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dir = opendir(base);
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if (!dir)
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return NULL;
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FOREACH_DIRENT_ALL(dent, dir, break) {
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char *rest;
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int i;
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if (dent->d_name[0] == '.')
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continue;
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if (!IN_SET(dent->d_type, DT_DIR, DT_LNK))
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continue;
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if (!startswith(dent->d_name, "host"))
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continue;
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i = strtoul(&dent->d_name[4], &rest, 10);
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if (rest[0] != '\0')
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continue;
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/*
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* find the smallest number; the host really needs to export its
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* own instance number per parent device; relying on the global host
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* enumeration and plainly rebasing the numbers sounds unreliable
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*/
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if (basenum == -1 || i < basenum)
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basenum = i;
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}
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if (basenum == -1)
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return hostdev;
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host -= basenum;
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path_prepend(path, "scsi-%u:%u:%u:%u", host, bus, target, lun);
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return hostdev;
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}
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static sd_device *handle_scsi_hyperv(sd_device *parent, char **path, size_t guid_str_len) {
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sd_device *hostdev;
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sd_device *vmbusdev;
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const char *guid_str;
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_cleanup_free_ char *lun = NULL;
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char guid[39];
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size_t i, k;
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assert(parent);
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assert(path);
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assert(guid_str_len < sizeof(guid));
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if (sd_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host", &hostdev) < 0)
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return NULL;
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if (sd_device_get_parent(hostdev, &vmbusdev) < 0)
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return NULL;
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if (sd_device_get_sysattr_value(vmbusdev, "device_id", &guid_str) < 0)
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return NULL;
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if (strlen(guid_str) < guid_str_len || guid_str[0] != '{' || guid_str[guid_str_len-1] != '}')
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return NULL;
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for (i = 1, k = 0; i < guid_str_len-1; i++) {
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if (guid_str[i] == '-')
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continue;
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guid[k++] = guid_str[i];
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}
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guid[k] = '\0';
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format_lun_number(parent, &lun);
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path_prepend(path, "vmbus-%s-%s", guid, lun);
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return parent;
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}
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static sd_device *handle_scsi(sd_device *parent, char **path, bool *supported_parent) {
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const char *devtype, *id, *name;
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if (sd_device_get_devtype(parent, &devtype) < 0 ||
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!streq(devtype, "scsi_device"))
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return parent;
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/* firewire */
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if (sd_device_get_sysattr_value(parent, "ieee1394_id", &id) >= 0) {
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path_prepend(path, "ieee1394-0x%s", id);
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*supported_parent = true;
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return skip_subsystem(parent, "scsi");
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}
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/* scsi sysfs does not have a "subsystem" for the transport */
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if (sd_device_get_syspath(parent, &name) < 0)
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return NULL;
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if (strstr(name, "/rport-")) {
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*supported_parent = true;
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return handle_scsi_fibre_channel(parent, path);
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}
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if (strstr(name, "/end_device-")) {
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*supported_parent = true;
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return handle_scsi_sas(parent, path);
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}
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if (strstr(name, "/session")) {
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*supported_parent = true;
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return handle_scsi_iscsi(parent, path);
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}
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if (strstr(name, "/ata"))
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return handle_scsi_ata(parent, path);
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if (strstr(name, "/vmbus_"))
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return handle_scsi_hyperv(parent, path, 37);
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else if (strstr(name, "/VMBUS"))
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return handle_scsi_hyperv(parent, path, 38);
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return handle_scsi_default(parent, path);
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}
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static sd_device *handle_cciss(sd_device *parent, char **path) {
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const char *str;
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unsigned controller, disk;
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if (sd_device_get_sysname(parent, &str) < 0)
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return NULL;
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if (sscanf(str, "c%ud%u%*s", &controller, &disk) != 2)
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return NULL;
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path_prepend(path, "cciss-disk%u", disk);
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return skip_subsystem(parent, "cciss");
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}
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static void handle_scsi_tape(sd_device *dev, char **path) {
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const char *name;
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/* must be the last device in the syspath */
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if (*path)
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return;
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if (sd_device_get_sysname(dev, &name) < 0)
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return;
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if (startswith(name, "nst") && strchr("lma", name[3]))
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path_prepend(path, "nst%c", name[3]);
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else if (startswith(name, "st") && strchr("lma", name[2]))
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path_prepend(path, "st%c", name[2]);
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}
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static sd_device *handle_usb(sd_device *parent, char **path) {
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const char *devtype, *str, *port;
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if (sd_device_get_devtype(parent, &devtype) < 0)
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return parent;
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if (!STR_IN_SET(devtype, "usb_interface", "usb_device"))
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return parent;
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if (sd_device_get_sysname(parent, &str) < 0)
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return parent;
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port = strchr(str, '-');
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if (!port)
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return parent;
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port++;
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path_prepend(path, "usb-0:%s", port);
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return skip_subsystem(parent, "usb");
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}
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static sd_device *handle_bcma(sd_device *parent, char **path) {
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const char *sysname;
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unsigned core;
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if (sd_device_get_sysname(parent, &sysname) < 0)
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return NULL;
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if (sscanf(sysname, "bcma%*u:%u", &core) != 1)
|
|
return NULL;
|
|
|
|
path_prepend(path, "bcma-%u", core);
|
|
return parent;
|
|
}
|
|
|
|
/* Handle devices of AP bus in System z platform. */
|
|
static sd_device *handle_ap(sd_device *parent, char **path) {
|
|
const char *type, *func;
|
|
|
|
assert(parent);
|
|
assert(path);
|
|
|
|
if (sd_device_get_sysattr_value(parent, "type", &type) >= 0 &&
|
|
sd_device_get_sysattr_value(parent, "ap_functions", &func) >= 0)
|
|
path_prepend(path, "ap-%s-%s", type, func);
|
|
else {
|
|
const char *sysname;
|
|
|
|
if (sd_device_get_sysname(parent, &sysname) >= 0)
|
|
path_prepend(path, "ap-%s", sysname);
|
|
}
|
|
|
|
return skip_subsystem(parent, "ap");
|
|
}
|
|
|
|
static int builtin_path_id(sd_device *dev, int argc, char *argv[], bool test) {
|
|
sd_device *parent;
|
|
_cleanup_free_ char *path = NULL;
|
|
bool supported_transport = false;
|
|
bool supported_parent = false;
|
|
const char *subsystem;
|
|
|
|
assert(dev);
|
|
|
|
/* walk up the chain of devices and compose path */
|
|
parent = dev;
|
|
while (parent) {
|
|
const char *subsys, *sysname;
|
|
|
|
if (sd_device_get_subsystem(parent, &subsys) < 0 ||
|
|
sd_device_get_sysname(parent, &sysname) < 0) {
|
|
;
|
|
} 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")) {
|
|
const char *sysnum;
|
|
|
|
if (sd_device_get_sysnum(parent, &sysnum) >= 0 && sysnum) {
|
|
path_prepend(&path, "serio-%s", sysnum);
|
|
parent = skip_subsystem(parent, "serio");
|
|
}
|
|
} else if (streq(subsys, "pci")) {
|
|
path_prepend(&path, "pci-%s", sysname);
|
|
parent = skip_subsystem(parent, "pci");
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "platform")) {
|
|
path_prepend(&path, "platform-%s", sysname);
|
|
parent = skip_subsystem(parent, "platform");
|
|
supported_transport = true;
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "acpi")) {
|
|
path_prepend(&path, "acpi-%s", sysname);
|
|
parent = skip_subsystem(parent, "acpi");
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "xen")) {
|
|
path_prepend(&path, "xen-%s", sysname);
|
|
parent = skip_subsystem(parent, "xen");
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "virtio")) {
|
|
parent = skip_subsystem(parent, "virtio");
|
|
supported_transport = true;
|
|
} else if (streq(subsys, "scm")) {
|
|
path_prepend(&path, "scm-%s", sysname);
|
|
parent = skip_subsystem(parent, "scm");
|
|
supported_transport = true;
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "ccw")) {
|
|
path_prepend(&path, "ccw-%s", sysname);
|
|
parent = skip_subsystem(parent, "ccw");
|
|
supported_transport = true;
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "ccwgroup")) {
|
|
path_prepend(&path, "ccwgroup-%s", sysname);
|
|
parent = skip_subsystem(parent, "ccwgroup");
|
|
supported_transport = true;
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "ap")) {
|
|
parent = handle_ap(parent, &path);
|
|
supported_transport = true;
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "iucv")) {
|
|
path_prepend(&path, "iucv-%s", sysname);
|
|
parent = skip_subsystem(parent, "iucv");
|
|
supported_transport = true;
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "nvme")) {
|
|
const char *nsid;
|
|
|
|
if (sd_device_get_sysattr_value(dev, "nsid", &nsid) >= 0) {
|
|
path_prepend(&path, "nvme-%s", nsid);
|
|
parent = skip_subsystem(parent, "nvme");
|
|
supported_parent = true;
|
|
supported_transport = true;
|
|
}
|
|
}
|
|
|
|
if (!parent)
|
|
break;
|
|
if (sd_device_get_parent(parent, &parent) < 0)
|
|
break;
|
|
}
|
|
|
|
if (!path)
|
|
return -ENOENT;
|
|
|
|
/*
|
|
* 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)
|
|
return -ENOENT;
|
|
|
|
/*
|
|
* 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 (sd_device_get_subsystem(dev, &subsystem) >= 0 &&
|
|
streq(subsystem, "block") &&
|
|
!supported_transport)
|
|
return -ENOENT;
|
|
|
|
{
|
|
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);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
const UdevBuiltin udev_builtin_path_id = {
|
|
.name = "path_id",
|
|
.cmd = builtin_path_id,
|
|
.help = "Compose persistent device path",
|
|
.run_once = true,
|
|
};
|