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0d54dcb566
Deprecate the /usr/bin/hostid call by reading the /etc/hostid file directly. Add the spl_hostid_path parameter to override the default /etc/hostid path. Rename the set_hostid() function to hostid_exec() to better reflect actual behavior and complement the new hostid_read() function. Use HW_INVALID_HOSTID as the spl_hostid sentinel value because zero seems to be a valid gethostid() result on Linux.
679 lines
17 KiB
C
679 lines
17 KiB
C
/*****************************************************************************\
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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* For details, see <http://github.com/behlendorf/spl/>.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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*****************************************************************************
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* Solaris Porting Layer (SPL) Generic Implementation.
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\*****************************************************************************/
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#include <sys/sysmacros.h>
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#include <sys/systeminfo.h>
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#include <sys/vmsystm.h>
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#include <sys/kobj.h>
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#include <sys/kmem.h>
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#include <sys/mutex.h>
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#include <sys/rwlock.h>
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#include <sys/taskq.h>
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#include <sys/tsd.h>
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#include <sys/zmod.h>
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#include <sys/debug.h>
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#include <sys/proc.h>
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#include <sys/kstat.h>
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#include <sys/utsname.h>
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#include <sys/file.h>
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#include <linux/kmod.h>
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#include <linux/proc_compat.h>
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#include <spl-debug.h>
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#ifdef SS_DEBUG_SUBSYS
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#undef SS_DEBUG_SUBSYS
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#endif
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#define SS_DEBUG_SUBSYS SS_GENERIC
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char spl_version[16] = "SPL v" SPL_META_VERSION;
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EXPORT_SYMBOL(spl_version);
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unsigned long spl_hostid = HW_INVALID_HOSTID;
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EXPORT_SYMBOL(spl_hostid);
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module_param(spl_hostid, ulong, 0644);
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MODULE_PARM_DESC(spl_hostid, "The system hostid.");
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char hw_serial[HW_HOSTID_LEN] = "<none>";
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EXPORT_SYMBOL(hw_serial);
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proc_t p0 = { 0 };
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EXPORT_SYMBOL(p0);
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#ifndef HAVE_KALLSYMS_LOOKUP_NAME
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kallsyms_lookup_name_t spl_kallsyms_lookup_name_fn = SYMBOL_POISON;
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#endif
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int
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highbit(unsigned long i)
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{
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register int h = 1;
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SENTRY;
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if (i == 0)
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SRETURN(0);
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#if BITS_PER_LONG == 64
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if (i & 0xffffffff00000000ul) {
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h += 32; i >>= 32;
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}
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#endif
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if (i & 0xffff0000) {
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h += 16; i >>= 16;
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}
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if (i & 0xff00) {
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h += 8; i >>= 8;
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}
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if (i & 0xf0) {
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h += 4; i >>= 4;
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}
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if (i & 0xc) {
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h += 2; i >>= 2;
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}
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if (i & 0x2) {
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h += 1;
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}
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SRETURN(h);
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}
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EXPORT_SYMBOL(highbit);
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#if BITS_PER_LONG == 32
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/*
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* Support 64/64 => 64 division on a 32-bit platform. While the kernel
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* provides a div64_u64() function for this we do not use it because the
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* implementation is flawed. There are cases which return incorrect
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* results as late as linux-2.6.35. Until this is fixed upstream the
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* spl must provide its own implementation.
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*
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* This implementation is a slightly modified version of the algorithm
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* proposed by the book 'Hacker's Delight'. The original source can be
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* found here and is available for use without restriction.
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*
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* http://www.hackersdelight.org/HDcode/newCode/divDouble.c
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*/
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/*
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* Calculate number of leading of zeros for a 64-bit value.
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*/
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static int
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nlz64(uint64_t x) {
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register int n = 0;
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if (x == 0)
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return 64;
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if (x <= 0x00000000FFFFFFFFULL) {n = n + 32; x = x << 32;}
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if (x <= 0x0000FFFFFFFFFFFFULL) {n = n + 16; x = x << 16;}
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if (x <= 0x00FFFFFFFFFFFFFFULL) {n = n + 8; x = x << 8;}
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if (x <= 0x0FFFFFFFFFFFFFFFULL) {n = n + 4; x = x << 4;}
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if (x <= 0x3FFFFFFFFFFFFFFFULL) {n = n + 2; x = x << 2;}
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if (x <= 0x7FFFFFFFFFFFFFFFULL) {n = n + 1;}
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return n;
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}
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/*
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* Newer kernels have a div_u64() function but we define our own
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* to simplify portibility between kernel versions.
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*/
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static inline uint64_t
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__div_u64(uint64_t u, uint32_t v)
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{
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(void) do_div(u, v);
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return u;
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}
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/*
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* Implementation of 64-bit unsigned division for 32-bit machines.
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*
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* First the procedure takes care of the case in which the divisor is a
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* 32-bit quantity. There are two subcases: (1) If the left half of the
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* dividend is less than the divisor, one execution of do_div() is all that
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* is required (overflow is not possible). (2) Otherwise it does two
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* divisions, using the grade school method.
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*/
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uint64_t
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__udivdi3(uint64_t u, uint64_t v)
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{
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uint64_t u0, u1, v1, q0, q1, k;
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int n;
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if (v >> 32 == 0) { // If v < 2**32:
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if (u >> 32 < v) { // If u/v cannot overflow,
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return __div_u64(u, v); // just do one division.
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} else { // If u/v would overflow:
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u1 = u >> 32; // Break u into two halves.
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u0 = u & 0xFFFFFFFF;
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q1 = __div_u64(u1, v); // First quotient digit.
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k = u1 - q1 * v; // First remainder, < v.
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u0 += (k << 32);
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q0 = __div_u64(u0, v); // Seconds quotient digit.
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return (q1 << 32) + q0;
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}
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} else { // If v >= 2**32:
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n = nlz64(v); // 0 <= n <= 31.
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v1 = (v << n) >> 32; // Normalize divisor, MSB is 1.
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u1 = u >> 1; // To ensure no overflow.
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q1 = __div_u64(u1, v1); // Get quotient from
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q0 = (q1 << n) >> 31; // Undo normalization and
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// division of u by 2.
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if (q0 != 0) // Make q0 correct or
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q0 = q0 - 1; // too small by 1.
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if ((u - q0 * v) >= v)
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q0 = q0 + 1; // Now q0 is correct.
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return q0;
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}
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}
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EXPORT_SYMBOL(__udivdi3);
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/*
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* Implementation of 64-bit signed division for 32-bit machines.
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*/
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int64_t
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__divdi3(int64_t u, int64_t v)
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{
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int64_t q, t;
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q = __udivdi3(abs64(u), abs64(v));
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t = (u ^ v) >> 63; // If u, v have different
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return (q ^ t) - t; // signs, negate q.
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}
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EXPORT_SYMBOL(__divdi3);
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/*
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* Implementation of 64-bit unsigned modulo for 32-bit machines.
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*/
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uint64_t
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__umoddi3(uint64_t dividend, uint64_t divisor)
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{
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return (dividend - (divisor * __udivdi3(dividend, divisor)));
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}
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EXPORT_SYMBOL(__umoddi3);
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#endif /* BITS_PER_LONG */
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/* NOTE: The strtoxx behavior is solely based on my reading of the Solaris
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* ddi_strtol(9F) man page. I have not verified the behavior of these
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* functions against their Solaris counterparts. It is possible that I
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* may have misinterpreted the man page or the man page is incorrect.
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*/
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int ddi_strtoul(const char *, char **, int, unsigned long *);
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int ddi_strtol(const char *, char **, int, long *);
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int ddi_strtoull(const char *, char **, int, unsigned long long *);
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int ddi_strtoll(const char *, char **, int, long long *);
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#define define_ddi_strtoux(type, valtype) \
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int ddi_strtou##type(const char *str, char **endptr, \
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int base, valtype *result) \
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{ \
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valtype last_value, value = 0; \
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char *ptr = (char *)str; \
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int flag = 1, digit; \
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\
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if (strlen(ptr) == 0) \
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return EINVAL; \
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\
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/* Auto-detect base based on prefix */ \
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if (!base) { \
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if (str[0] == '0') { \
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if (tolower(str[1])=='x' && isxdigit(str[2])) { \
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base = 16; /* hex */ \
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ptr += 2; \
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} else if (str[1] >= '0' && str[1] < 8) { \
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base = 8; /* octal */ \
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ptr += 1; \
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} else { \
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return EINVAL; \
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} \
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} else { \
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base = 10; /* decimal */ \
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} \
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} \
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\
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while (1) { \
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if (isdigit(*ptr)) \
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digit = *ptr - '0'; \
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else if (isalpha(*ptr)) \
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digit = tolower(*ptr) - 'a' + 10; \
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else \
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break; \
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\
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if (digit >= base) \
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break; \
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\
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last_value = value; \
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value = value * base + digit; \
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if (last_value > value) /* Overflow */ \
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return ERANGE; \
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\
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flag = 1; \
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ptr++; \
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} \
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\
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if (flag) \
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*result = value; \
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\
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if (endptr) \
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*endptr = (char *)(flag ? ptr : str); \
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\
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return 0; \
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} \
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#define define_ddi_strtox(type, valtype) \
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int ddi_strto##type(const char *str, char **endptr, \
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int base, valtype *result) \
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{ \
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int rc; \
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\
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if (*str == '-') { \
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rc = ddi_strtou##type(str + 1, endptr, base, result); \
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if (!rc) { \
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if (*endptr == str + 1) \
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*endptr = (char *)str; \
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else \
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*result = -*result; \
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} \
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} else { \
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rc = ddi_strtou##type(str, endptr, base, result); \
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} \
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\
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return rc; \
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}
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define_ddi_strtoux(l, unsigned long)
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define_ddi_strtox(l, long)
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define_ddi_strtoux(ll, unsigned long long)
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define_ddi_strtox(ll, long long)
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EXPORT_SYMBOL(ddi_strtoul);
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EXPORT_SYMBOL(ddi_strtol);
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EXPORT_SYMBOL(ddi_strtoll);
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EXPORT_SYMBOL(ddi_strtoull);
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int
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ddi_copyin(const void *from, void *to, size_t len, int flags)
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{
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/* Fake ioctl() issued by kernel, 'from' is a kernel address */
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if (flags & FKIOCTL) {
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memcpy(to, from, len);
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return 0;
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}
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return copyin(from, to, len);
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}
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EXPORT_SYMBOL(ddi_copyin);
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int
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ddi_copyout(const void *from, void *to, size_t len, int flags)
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{
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/* Fake ioctl() issued by kernel, 'from' is a kernel address */
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if (flags & FKIOCTL) {
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memcpy(to, from, len);
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return 0;
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}
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return copyout(from, to, len);
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}
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EXPORT_SYMBOL(ddi_copyout);
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#ifndef HAVE_PUT_TASK_STRUCT
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/*
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* This is only a stub function which should never be used. The SPL should
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* never be putting away the last reference on a task structure so this will
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* not be called. However, we still need to define it so the module does not
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* have undefined symbol at load time. That all said if this impossible
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* thing does somehow happen PANIC immediately so we know about it.
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*/
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void
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__put_task_struct(struct task_struct *t)
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{
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PANIC("Unexpectly put last reference on task %d\n", (int)t->pid);
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}
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EXPORT_SYMBOL(__put_task_struct);
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#endif /* HAVE_PUT_TASK_STRUCT */
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struct new_utsname *__utsname(void)
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{
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#ifdef HAVE_INIT_UTSNAME
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return init_utsname();
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#else
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return &system_utsname;
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#endif
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}
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EXPORT_SYMBOL(__utsname);
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/*
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* Read the unique system identifier from the /etc/hostid file.
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*
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* The behavior of /usr/bin/hostid on Linux systems with the
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* regular eglibc and coreutils is:
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*
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* 1. Generate the value if the /etc/hostid file does not exist
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* or if the /etc/hostid file is less than four bytes in size.
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*
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* 2. If the /etc/hostid file is at least 4 bytes, then return
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* the first four bytes [0..3] in native endian order.
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*
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* 3. Always ignore bytes [4..] if they exist in the file.
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*
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* Only the first four bytes are significant, even on systems that
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* have a 64-bit word size.
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*
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* See:
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*
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* eglibc: sysdeps/unix/sysv/linux/gethostid.c
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* coreutils: src/hostid.c
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*
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* Notes:
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*
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* The /etc/hostid file on Solaris is a text file that often reads:
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*
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* # DO NOT EDIT
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* "0123456789"
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*
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* Directly copying this file to Linux results in a constant
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* hostid of 4f442023 because the default comment constitutes
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* the first four bytes of the file.
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*
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*/
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char *spl_hostid_path = HW_HOSTID_PATH;
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module_param(spl_hostid_path, charp, 0444);
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MODULE_PARM_DESC(spl_hostid_path, "The system hostid file (/etc/hostid)");
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static int
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hostid_read(void)
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{
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int result;
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uint64_t size;
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struct _buf *file;
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unsigned long hostid = 0;
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file = kobj_open_file(spl_hostid_path);
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if (file == (struct _buf *)-1) {
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printk(KERN_WARNING
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"SPL: The %s file is not found.\n",
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spl_hostid_path);
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return -1;
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}
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result = kobj_get_filesize(file, &size);
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if (result != 0) {
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printk(KERN_WARNING
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"SPL: kobj_get_filesize returned %i on %s\n",
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result, spl_hostid_path);
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kobj_close_file(file);
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return -2;
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}
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if (size < sizeof(HW_HOSTID_MASK)) {
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printk(KERN_WARNING
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"SPL: Ignoring the %s file because it is %llu bytes; "
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"expecting %lu bytes instead.\n",
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spl_hostid_path, size, sizeof(HW_HOSTID_MASK));
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kobj_close_file(file);
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return -3;
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}
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/* Read directly into the variable like eglibc does. */
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/* Short reads are okay; native behavior is preserved. */
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result = kobj_read_file(file, (char *)&hostid, sizeof(hostid), 0);
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if (result < 0) {
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printk(KERN_WARNING
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"SPL: kobj_read_file returned %i on %s\n",
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result, spl_hostid_path);
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kobj_close_file(file);
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return -4;
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}
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/* Mask down to 32 bits like coreutils does. */
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spl_hostid = hostid & HW_HOSTID_MASK;
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kobj_close_file(file);
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return 0;
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}
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#define GET_HOSTID_CMD \
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"exec 0</dev/null " \
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" 1>/proc/sys/kernel/spl/hostid " \
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" 2>/dev/null; " \
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"hostid"
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static int
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hostid_exec(void)
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{
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char *argv[] = { "/bin/sh",
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"-c",
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GET_HOSTID_CMD,
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NULL };
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char *envp[] = { "HOME=/",
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"TERM=linux",
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"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
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NULL };
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int rc;
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/* Doing address resolution in the kernel is tricky and just
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* not a good idea in general. So to set the proper 'hw_serial'
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* use the usermodehelper support to ask '/bin/sh' to run
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* '/usr/bin/hostid' and redirect the result to /proc/sys/spl/hostid
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* for us to use. It's a horrific solution but it will do for now.
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*/
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rc = call_usermodehelper(argv[0], argv, envp, 1);
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if (rc)
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printk("SPL: Failed user helper '%s %s %s', rc = %d\n",
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argv[0], argv[1], argv[2], rc);
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return rc;
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}
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uint32_t
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zone_get_hostid(void *zone)
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{
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unsigned long hostid;
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/* Only the global zone is supported */
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ASSERT(zone == NULL);
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if (ddi_strtoul(hw_serial, NULL, HW_HOSTID_LEN-1, &hostid) != 0)
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return HW_INVALID_HOSTID;
|
|
|
|
return (uint32_t)hostid;
|
|
}
|
|
EXPORT_SYMBOL(zone_get_hostid);
|
|
|
|
#ifndef HAVE_KALLSYMS_LOOKUP_NAME
|
|
/*
|
|
* The kallsyms_lookup_name() kernel function is not an exported symbol in
|
|
* Linux 2.6.19 through 2.6.32 inclusive.
|
|
*
|
|
* This function replaces the functionality by performing an upcall to user
|
|
* space where /proc/kallsyms is consulted for the requested address.
|
|
*
|
|
*/
|
|
|
|
#define GET_KALLSYMS_ADDR_CMD \
|
|
"exec 0</dev/null " \
|
|
" 1>/proc/sys/kernel/spl/kallsyms_lookup_name " \
|
|
" 2>/dev/null; " \
|
|
"awk '{ if ( $3 == \"kallsyms_lookup_name\" ) { print $1 } }' " \
|
|
" /proc/kallsyms "
|
|
|
|
static int
|
|
set_kallsyms_lookup_name(void)
|
|
{
|
|
char *argv[] = { "/bin/sh",
|
|
"-c",
|
|
GET_KALLSYMS_ADDR_CMD,
|
|
NULL };
|
|
char *envp[] = { "HOME=/",
|
|
"TERM=linux",
|
|
"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
|
|
NULL };
|
|
int rc;
|
|
|
|
rc = call_usermodehelper(argv[0], argv, envp, 1);
|
|
if (rc)
|
|
printk("SPL: Failed user helper '%s %s %s', rc = %d\n",
|
|
argv[0], argv[1], argv[2], rc);
|
|
|
|
return rc;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
__init spl_init(void)
|
|
{
|
|
int rc = 0;
|
|
|
|
if ((rc = debug_init()))
|
|
return rc;
|
|
|
|
if ((rc = spl_kmem_init()))
|
|
SGOTO(out1, rc);
|
|
|
|
if ((rc = spl_mutex_init()))
|
|
SGOTO(out2, rc);
|
|
|
|
if ((rc = spl_rw_init()))
|
|
SGOTO(out3, rc);
|
|
|
|
if ((rc = spl_taskq_init()))
|
|
SGOTO(out4, rc);
|
|
|
|
if ((rc = vn_init()))
|
|
SGOTO(out5, rc);
|
|
|
|
if ((rc = proc_init()))
|
|
SGOTO(out6, rc);
|
|
|
|
if ((rc = kstat_init()))
|
|
SGOTO(out7, rc);
|
|
|
|
if ((rc = tsd_init()))
|
|
SGOTO(out8, rc);
|
|
|
|
if ((rc = zlib_init()))
|
|
SGOTO(out9, rc);
|
|
|
|
/*
|
|
* Get the hostid if it was not passed as a module parameter. Try
|
|
* reading the /etc/hostid file directly, and then fall back to calling
|
|
* the /usr/bin/hostid utility.
|
|
*/
|
|
|
|
if (spl_hostid == HW_INVALID_HOSTID
|
|
&& (rc = hostid_read()) && (rc = hostid_exec()))
|
|
SGOTO(out10, rc = -EADDRNOTAVAIL);
|
|
|
|
#ifndef HAVE_KALLSYMS_LOOKUP_NAME
|
|
if ((rc = set_kallsyms_lookup_name()))
|
|
SGOTO(out10, rc = -EADDRNOTAVAIL);
|
|
#endif /* HAVE_KALLSYMS_LOOKUP_NAME */
|
|
|
|
if ((rc = spl_kmem_init_kallsyms_lookup()))
|
|
SGOTO(out10, rc);
|
|
|
|
printk(KERN_NOTICE "SPL: Loaded module v%s%s, using hostid 0x%08x\n",
|
|
SPL_META_VERSION, SPL_DEBUG_STR, (unsigned int) spl_hostid);
|
|
SRETURN(rc);
|
|
out10:
|
|
zlib_fini();
|
|
out9:
|
|
tsd_fini();
|
|
out8:
|
|
kstat_fini();
|
|
out7:
|
|
proc_fini();
|
|
out6:
|
|
vn_fini();
|
|
out5:
|
|
spl_taskq_fini();
|
|
out4:
|
|
spl_rw_fini();
|
|
out3:
|
|
spl_mutex_fini();
|
|
out2:
|
|
spl_kmem_fini();
|
|
out1:
|
|
debug_fini();
|
|
|
|
printk(KERN_NOTICE "SPL: Failed to Load Solaris Porting Layer v%s%s"
|
|
", rc = %d\n", SPL_META_VERSION, SPL_DEBUG_STR, rc);
|
|
return rc;
|
|
}
|
|
|
|
static void
|
|
spl_fini(void)
|
|
{
|
|
SENTRY;
|
|
|
|
printk(KERN_NOTICE "SPL: Unloaded module v%s%s\n",
|
|
SPL_META_VERSION, SPL_DEBUG_STR);
|
|
zlib_fini();
|
|
tsd_fini();
|
|
kstat_fini();
|
|
proc_fini();
|
|
vn_fini();
|
|
spl_taskq_fini();
|
|
spl_rw_fini();
|
|
spl_mutex_fini();
|
|
spl_kmem_fini();
|
|
debug_fini();
|
|
}
|
|
|
|
/* Called when a dependent module is loaded */
|
|
void
|
|
spl_setup(void)
|
|
{
|
|
int rc;
|
|
|
|
/*
|
|
* At module load time the pwd is set to '/' on a Solaris system.
|
|
* On a Linux system will be set to whatever directory the caller
|
|
* was in when executing insmod/modprobe.
|
|
*/
|
|
rc = vn_set_pwd("/");
|
|
if (rc)
|
|
printk("SPL: Warning unable to set pwd to '/': %d\n", rc);
|
|
}
|
|
EXPORT_SYMBOL(spl_setup);
|
|
|
|
/* Called when a dependent module is unloaded */
|
|
void
|
|
spl_cleanup(void)
|
|
{
|
|
}
|
|
EXPORT_SYMBOL(spl_cleanup);
|
|
|
|
module_init(spl_init);
|
|
module_exit(spl_fini);
|
|
|
|
MODULE_AUTHOR("Lawrence Livermore National Labs");
|
|
MODULE_DESCRIPTION("Solaris Porting Layer");
|
|
MODULE_LICENSE("GPL");
|