710 lines
25 KiB
C
710 lines
25 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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* Copyright (C) 2009-2011 Kay Sievers <kay@vrfy.org>
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*
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* Logic based on Hannes Reinecke's shell script.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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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 <string.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 "string-util.h"
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#include "sysexits.h"
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#include "udev.h"
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#include "udev-util.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 void format_lun_number(struct udev_device *dev, char **path) {
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unsigned long lun = strtoul(udev_device_get_sysnum(dev), 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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}
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static struct udev_device *skip_subsystem(struct udev_device *dev, const char *subsys) {
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struct udev_device *parent = dev;
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assert(dev);
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assert(subsys);
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while (parent) {
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const char *subsystem;
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subsystem = udev_device_get_subsystem(parent);
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if (!streq_ptr(subsystem, subsys))
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break;
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dev = parent;
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parent = udev_device_get_parent(parent);
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}
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return dev;
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}
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static struct udev_device *handle_scsi_fibre_channel(struct udev_device *parent, char **path) {
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struct udev *udev;
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struct udev_device *targetdev;
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_cleanup_udev_device_unref_ struct udev_device *fcdev = NULL;
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const char *port;
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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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udev = udev_device_get_udev(parent);
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targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
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if (!targetdev)
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return NULL;
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fcdev = udev_device_new_from_subsystem_sysname(udev, "fc_transport", udev_device_get_sysname(targetdev));
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if (!fcdev)
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return NULL;
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port = udev_device_get_sysattr_value(fcdev, "port_name");
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if (!port)
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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 struct udev_device *handle_scsi_sas_wide_port(struct udev_device *parent, char **path) {
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struct udev *udev;
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struct udev_device *targetdev, *target_parent;
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_cleanup_udev_device_unref_ struct udev_device *sasdev = NULL;
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const char *sas_address;
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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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udev = udev_device_get_udev(parent);
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targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
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if (!targetdev)
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return NULL;
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target_parent = udev_device_get_parent(targetdev);
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if (!target_parent)
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return NULL;
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sasdev = udev_device_new_from_subsystem_sysname(udev, "sas_device",
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udev_device_get_sysname(target_parent));
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if (!sasdev)
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return NULL;
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sas_address = udev_device_get_sysattr_value(sasdev, "sas_address");
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if (!sas_address)
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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 struct udev_device *handle_scsi_sas(struct udev_device *parent, char **path)
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{
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struct udev *udev;
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struct udev_device *targetdev, *target_parent, *port, *expander;
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_cleanup_udev_device_unref_ struct udev_device
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*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;
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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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udev = udev_device_get_udev(parent);
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targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_target");
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if (!targetdev)
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return NULL;
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target_parent = udev_device_get_parent(targetdev);
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if (!target_parent)
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return NULL;
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/* Get sas device */
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target_sasdev = udev_device_new_from_subsystem_sysname(
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udev, "sas_device", udev_device_get_sysname(target_parent));
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if (!target_sasdev)
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return NULL;
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/* The next parent is sas port */
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port = udev_device_get_parent(target_parent);
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if (!port)
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return NULL;
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/* Get port device */
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port_sasdev = udev_device_new_from_subsystem_sysname(
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udev, "sas_port", udev_device_get_sysname(port));
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phy_count = udev_device_get_sysattr_value(port_sasdev, "num_phys");
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if (!phy_count)
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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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phy_id = udev_device_get_sysattr_value(target_sasdev, "phy_identifier");
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if (!phy_id)
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return NULL;
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/* The port's parent is either hba or expander */
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expander = udev_device_get_parent(port);
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if (!expander)
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return NULL;
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/* Get expander device */
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expander_sasdev = udev_device_new_from_subsystem_sysname(
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udev, "sas_device", udev_device_get_sysname(expander));
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if (expander_sasdev) {
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/* Get expander's address */
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sas_address = udev_device_get_sysattr_value(expander_sasdev,
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"sas_address");
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if (!sas_address)
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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 struct udev_device *handle_scsi_iscsi(struct udev_device *parent, char **path) {
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struct udev *udev;
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struct udev_device *transportdev;
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_cleanup_udev_device_unref_ struct udev_device
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*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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assert(parent);
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assert(path);
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udev = udev_device_get_udev(parent);
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/* find iscsi session */
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transportdev = parent;
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for (;;) {
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transportdev = udev_device_get_parent(transportdev);
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if (!transportdev)
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return NULL;
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if (startswith(udev_device_get_sysname(transportdev), "session"))
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break;
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}
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/* find iscsi session device */
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sessiondev = udev_device_new_from_subsystem_sysname(udev, "iscsi_session", udev_device_get_sysname(transportdev));
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if (!sessiondev)
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return NULL;
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target = udev_device_get_sysattr_value(sessiondev, "targetname");
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if (!target)
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return NULL;
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connname = strjoina("connection", udev_device_get_sysnum(transportdev), ":0");
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conndev = udev_device_new_from_subsystem_sysname(udev, "iscsi_connection", connname);
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if (!conndev)
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return NULL;
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addr = udev_device_get_sysattr_value(conndev, "persistent_address");
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port = udev_device_get_sysattr_value(conndev, "persistent_port");
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if (!addr || !port)
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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 struct udev_device *handle_scsi_ata(struct udev_device *parent, char **path) {
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struct udev *udev;
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struct udev_device *targetdev, *target_parent;
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_cleanup_udev_device_unref_ struct udev_device *atadev = NULL;
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const char *port_no;
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assert(parent);
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assert(path);
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udev = udev_device_get_udev(parent);
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targetdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
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if (!targetdev)
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return NULL;
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target_parent = udev_device_get_parent(targetdev);
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if (!target_parent)
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return NULL;
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atadev = udev_device_new_from_subsystem_sysname(udev, "ata_port", udev_device_get_sysname(target_parent));
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if (!atadev)
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return NULL;
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port_no = udev_device_get_sysattr_value(atadev, "port_no");
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if (!port_no)
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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 struct udev_device *handle_scsi_default(struct udev_device *parent, char **path) {
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struct udev_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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hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
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if (!hostdev)
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return NULL;
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name = udev_device_get_sysname(parent);
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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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base = udev_device_get_syspath(hostdev);
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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 struct udev_device *handle_scsi_hyperv(struct udev_device *parent, char **path, size_t guid_str_len) {
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struct udev_device *hostdev;
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struct udev_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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hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
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if (!hostdev)
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return NULL;
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vmbusdev = udev_device_get_parent(hostdev);
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if (!vmbusdev)
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return NULL;
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guid_str = udev_device_get_sysattr_value(vmbusdev, "device_id");
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if (!guid_str)
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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 struct udev_device *handle_scsi(struct udev_device *parent, char **path, bool *supported_parent) {
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const char *devtype, *id, *name;
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devtype = udev_device_get_devtype(parent);
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if (!streq_ptr(devtype, "scsi_device"))
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return parent;
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/* firewire */
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id = udev_device_get_sysattr_value(parent, "ieee1394_id");
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if (id) {
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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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name = udev_device_get_syspath(parent);
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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 struct udev_device *handle_cciss(struct udev_device *parent, char **path) {
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const char *str;
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unsigned int controller, disk;
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str = udev_device_get_sysname(parent);
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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(struct udev_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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name = udev_device_get_sysname(dev);
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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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|
}
|
|
|
|
static struct udev_device *handle_usb(struct udev_device *parent, char **path) {
|
|
const char *devtype, *str, *port;
|
|
|
|
devtype = udev_device_get_devtype(parent);
|
|
if (!devtype)
|
|
return parent;
|
|
if (!STR_IN_SET(devtype, "usb_interface", "usb_device"))
|
|
return parent;
|
|
|
|
str = udev_device_get_sysname(parent);
|
|
port = strchr(str, '-');
|
|
if (!port)
|
|
return parent;
|
|
port++;
|
|
|
|
path_prepend(path, "usb-0:%s", port);
|
|
return skip_subsystem(parent, "usb");
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/* Handle devices of AP bus in System z platform. */
|
|
static struct udev_device *handle_ap(struct udev_device *parent, char **path) {
|
|
const char *type, *func;
|
|
|
|
assert(parent);
|
|
assert(path);
|
|
|
|
type = udev_device_get_sysattr_value(parent, "type");
|
|
func = udev_device_get_sysattr_value(parent, "ap_functions");
|
|
|
|
if (type && func)
|
|
path_prepend(path, "ap-%s-%s", type, func);
|
|
else
|
|
path_prepend(path, "ap-%s", udev_device_get_sysname(parent));
|
|
|
|
return skip_subsystem(parent, "ap");
|
|
}
|
|
|
|
static int builtin_path_id(struct udev_device *dev, int argc, char *argv[], bool test) {
|
|
struct udev_device *parent;
|
|
_cleanup_free_ char *path = NULL;
|
|
bool supported_transport = false;
|
|
bool supported_parent = false;
|
|
|
|
assert(dev);
|
|
|
|
/* walk up the chain of devices and compose path */
|
|
parent = dev;
|
|
while (parent) {
|
|
const char *subsys;
|
|
|
|
subsys = udev_device_get_subsystem(parent);
|
|
if (!subsys) {
|
|
;
|
|
} 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, "virtio")) {
|
|
parent = skip_subsystem(parent, "virtio");
|
|
supported_transport = 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;
|
|
} else if (streq(subsys, "ccw")) {
|
|
path_prepend(&path, "ccw-%s", udev_device_get_sysname(parent));
|
|
parent = skip_subsystem(parent, "ccw");
|
|
supported_transport = true;
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "ccwgroup")) {
|
|
path_prepend(&path, "ccwgroup-%s", udev_device_get_sysname(parent));
|
|
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", udev_device_get_sysname(parent));
|
|
parent = skip_subsystem(parent, "iucv");
|
|
supported_transport = true;
|
|
supported_parent = true;
|
|
} else if (streq(subsys, "nvme")) {
|
|
const char *nsid = udev_device_get_sysattr_value(dev, "nsid");
|
|
|
|
if (nsid) {
|
|
path_prepend(&path, "nvme-%s", nsid);
|
|
parent = skip_subsystem(parent, "nvme");
|
|
supported_parent = true;
|
|
supported_transport = true;
|
|
}
|
|
}
|
|
|
|
if (parent)
|
|
parent = udev_device_get_parent(parent);
|
|
}
|
|
|
|
if (!path)
|
|
return EXIT_FAILURE;
|
|
|
|
/*
|
|
* 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 EXIT_FAILURE;
|
|
|
|
/*
|
|
* 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_ptr(udev_device_get_subsystem(dev), "block") && !supported_transport)
|
|
return EXIT_FAILURE;
|
|
|
|
{
|
|
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 EXIT_SUCCESS;
|
|
}
|
|
|
|
const struct udev_builtin udev_builtin_path_id = {
|
|
.name = "path_id",
|
|
.cmd = builtin_path_id,
|
|
.help = "Compose persistent device path",
|
|
.run_once = true,
|
|
};
|