1*eda14cbcSMatt Macy /* 2*eda14cbcSMatt Macy * CDDL HEADER START 3*eda14cbcSMatt Macy * 4*eda14cbcSMatt Macy * The contents of this file are subject to the terms of the 5*eda14cbcSMatt Macy * Common Development and Distribution License (the "License"). 6*eda14cbcSMatt Macy * You may not use this file except in compliance with the License. 7*eda14cbcSMatt Macy * 8*eda14cbcSMatt Macy * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*eda14cbcSMatt Macy * or http://www.opensolaris.org/os/licensing. 10*eda14cbcSMatt Macy * See the License for the specific language governing permissions 11*eda14cbcSMatt Macy * and limitations under the License. 12*eda14cbcSMatt Macy * 13*eda14cbcSMatt Macy * When distributing Covered Code, include this CDDL HEADER in each 14*eda14cbcSMatt Macy * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*eda14cbcSMatt Macy * If applicable, add the following below this CDDL HEADER, with the 16*eda14cbcSMatt Macy * fields enclosed by brackets "[]" replaced with your own identifying 17*eda14cbcSMatt Macy * information: Portions Copyright [yyyy] [name of copyright owner] 18*eda14cbcSMatt Macy * 19*eda14cbcSMatt Macy * CDDL HEADER END 20*eda14cbcSMatt Macy */ 21*eda14cbcSMatt Macy /* 22*eda14cbcSMatt Macy * Copyright (c) 2017, Lawrence Livermore National Security, LLC. 23*eda14cbcSMatt Macy */ 24*eda14cbcSMatt Macy 25*eda14cbcSMatt Macy #include <fcntl.h> 26*eda14cbcSMatt Macy #include <stdlib.h> 27*eda14cbcSMatt Macy #include <stdio.h> 28*eda14cbcSMatt Macy #include <sys/types.h> 29*eda14cbcSMatt Macy #include <sys/stat.h> 30*eda14cbcSMatt Macy #include <sys/systeminfo.h> 31*eda14cbcSMatt Macy 32*eda14cbcSMatt Macy static unsigned long 33*eda14cbcSMatt Macy get_spl_hostid(void) 34*eda14cbcSMatt Macy { 35*eda14cbcSMatt Macy FILE *f; 36*eda14cbcSMatt Macy unsigned long hostid; 37*eda14cbcSMatt Macy char *env; 38*eda14cbcSMatt Macy 39*eda14cbcSMatt Macy /* 40*eda14cbcSMatt Macy * Allow the hostid to be subverted for testing. 41*eda14cbcSMatt Macy */ 42*eda14cbcSMatt Macy env = getenv("ZFS_HOSTID"); 43*eda14cbcSMatt Macy if (env) { 44*eda14cbcSMatt Macy hostid = strtoull(env, NULL, 0); 45*eda14cbcSMatt Macy return (hostid & HOSTID_MASK); 46*eda14cbcSMatt Macy } 47*eda14cbcSMatt Macy 48*eda14cbcSMatt Macy f = fopen("/sys/module/spl/parameters/spl_hostid", "r"); 49*eda14cbcSMatt Macy if (!f) 50*eda14cbcSMatt Macy return (0); 51*eda14cbcSMatt Macy 52*eda14cbcSMatt Macy if (fscanf(f, "%lu", &hostid) != 1) 53*eda14cbcSMatt Macy hostid = 0; 54*eda14cbcSMatt Macy 55*eda14cbcSMatt Macy fclose(f); 56*eda14cbcSMatt Macy 57*eda14cbcSMatt Macy return (hostid & HOSTID_MASK); 58*eda14cbcSMatt Macy } 59*eda14cbcSMatt Macy 60*eda14cbcSMatt Macy unsigned long 61*eda14cbcSMatt Macy get_system_hostid(void) 62*eda14cbcSMatt Macy { 63*eda14cbcSMatt Macy unsigned long system_hostid = get_spl_hostid(); 64*eda14cbcSMatt Macy /* 65*eda14cbcSMatt Macy * We do not use the library call gethostid() because 66*eda14cbcSMatt Macy * it generates a hostid value that the kernel is 67*eda14cbcSMatt Macy * unaware of, if the spl_hostid module parameter has not 68*eda14cbcSMatt Macy * been set and there is no system hostid file (e.g. 69*eda14cbcSMatt Macy * /etc/hostid). The kernel and userspace must agree. 70*eda14cbcSMatt Macy * See comments above hostid_read() in the SPL. 71*eda14cbcSMatt Macy */ 72*eda14cbcSMatt Macy if (system_hostid == 0) { 73*eda14cbcSMatt Macy int fd, rc; 74*eda14cbcSMatt Macy unsigned long hostid; 75*eda14cbcSMatt Macy int hostid_size = 4; /* 4 bytes regardless of arch */ 76*eda14cbcSMatt Macy 77*eda14cbcSMatt Macy fd = open("/etc/hostid", O_RDONLY); 78*eda14cbcSMatt Macy if (fd >= 0) { 79*eda14cbcSMatt Macy rc = read(fd, &hostid, hostid_size); 80*eda14cbcSMatt Macy if (rc > 0) 81*eda14cbcSMatt Macy system_hostid = (hostid & HOSTID_MASK); 82*eda14cbcSMatt Macy close(fd); 83*eda14cbcSMatt Macy } 84*eda14cbcSMatt Macy } 85*eda14cbcSMatt Macy return (system_hostid); 86*eda14cbcSMatt Macy } 87