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d1ff2312b0
Remove all instances of functions being reimplemented in the SPL. When the prototypes are available in the linux headers but the function address itself is not exported use kallsyms_lookup_name() to find the address. The function name itself can them become a define which calls a function pointer. This is preferable to reimplementing the function in the SPL because it ensures we get the correct version of the function for the running kernel. This is actually pretty safe because the prototype is defined in the headers so we know we are calling the function properly. This patch also includes a rhel5 kernel patch we exports the needed symbols so we don't need to use kallsyms_lookup_name(). There are autoconf checks to detect if the symbol is exported and if so to use it directly. We should add patches for stock upstream kernels as needed if for no other reason than so we can easily track which additional symbols we needed exported. Those patches can also be used by anyone willing to rebuild their kernel, but this should not be a requirement. The rhel5 version of the export-symbols patch has been applied to the chaos kernel. Additional fixes: 1) Implement vmem_size() function using get_vmalloc_info() 2) SPL_CHECK_SYMBOL_EXPORT macro updated to use $LINUX_OBJ instead of $LINUX because Module.symvers is a build product. When $LINUX_OBJ != $LINUX we will not properly detect exported symbols. 3) SPL_LINUX_COMPILE_IFELSE macro updated to add include2 and $LINUX/include search paths to allow proper compilation when the kernel target build directory is not the source directory.
385 lines
8.9 KiB
C
385 lines
8.9 KiB
C
/*
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* This file is part of the SPL: Solaris Porting Layer.
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*
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* Copyright (c) 2008 Lawrence Livermore National Security, LLC.
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* Produced at Lawrence Livermore National Laboratory
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* Written by:
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* Brian Behlendorf <behlendorf1@llnl.gov>,
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* Herb Wartens <wartens2@llnl.gov>,
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* Jim Garlick <garlick@llnl.gov>
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* UCRL-CODE-235197
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*
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* This 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
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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 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 this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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/vnode.h>
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#include <sys/kmem.h>
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#include <sys/mutex.h>
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#include <sys/taskq.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 <linux/kmod.h>
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#ifdef DEBUG_SUBSYSTEM
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#undef DEBUG_SUBSYSTEM
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#endif
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#define DEBUG_SUBSYSTEM S_GENERIC
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char spl_version[16] = "SPL v" VERSION;
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long spl_hostid = 0;
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EXPORT_SYMBOL(spl_hostid);
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char hw_serial[HW_HOSTID_LEN] = "<none>";
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EXPORT_SYMBOL(hw_serial);
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int 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 = NULL;
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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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ENTRY;
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if (i == 0)
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RETURN(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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RETURN(h);
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}
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EXPORT_SYMBOL(highbit);
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/*
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* Implementation of 64 bit division for 32-bit machines.
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*/
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#if BITS_PER_LONG == 32
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uint64_t __udivdi3(uint64_t dividend, uint64_t divisor)
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{
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#ifdef HAVE_DIV64_64
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return div64_64(dividend, divisor);
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#else
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/* Taken from a 2.6.24 kernel. */
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uint32_t high, d;
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high = divisor >> 32;
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if (high) {
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unsigned int shift = fls(high);
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d = divisor >> shift;
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dividend >>= shift;
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} else
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d = divisor;
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do_div(dividend, d);
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return dividend;
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#endif
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}
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EXPORT_SYMBOL(__udivdi3);
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/*
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* Implementation of 64 bit modulo for 32-bit machines.
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*/
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uint64_t __umoddi3(uint64_t dividend, uint64_t divisor)
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{
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return dividend - divisor * (dividend / divisor);
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}
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EXPORT_SYMBOL(__umoddi3);
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#endif
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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 misinterpretted 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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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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static int
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set_hostid(void)
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{
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char sh_path[] = "/bin/sh";
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char *argv[] = { sh_path,
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"-c",
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"/usr/bin/hostid >/proc/sys/kernel/spl/hostid",
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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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/* 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 horific solution but it will do for now.
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*/
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return call_usermodehelper(sh_path, argv, envp, 1);
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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;
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return (uint32_t)hostid;
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}
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EXPORT_SYMBOL(zone_get_hostid);
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#ifdef HAVE_KALLSYMS_LOOKUP_NAME
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#define set_kallsyms_lookup_name() (0)
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#else
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/*
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* Because kallsyms_lookup_name() is no longer exported in the
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* mainline kernel we are forced to resort to somewhat drastic
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* measures. This function replaces the functionality by performing
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* an upcall to user space where /proc/kallsyms is consulted for
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* the requested address.
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*/
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#define GET_KALLSYMS_ADDR_CMD \
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"awk '{ if ( $3 == \"kallsyms_lookup_name\") { print $1 } }' " \
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"/proc/kallsyms >/proc/sys/kernel/spl/kallsyms_lookup_name"
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static int
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set_kallsyms_lookup_name(void)
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{
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char sh_path[] = "/bin/sh";
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char *argv[] = { sh_path,
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"-c",
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GET_KALLSYMS_ADDR_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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rc = call_usermodehelper(sh_path, argv, envp, 1);
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if (rc)
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return rc;
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return spl_kmem_init_kallsyms_lookup();
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}
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#endif
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static int __init spl_init(void)
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{
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int rc = 0;
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if ((rc = debug_init()))
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return rc;
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if ((rc = spl_kmem_init()))
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GOTO(out , rc);
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if ((rc = spl_mutex_init()))
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GOTO(out2 , rc);
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if ((rc = spl_taskq_init()))
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GOTO(out3, rc);
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if ((rc = vn_init()))
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GOTO(out4, rc);
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if ((rc = proc_init()))
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GOTO(out5, rc);
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if ((rc = kstat_init()))
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GOTO(out6, rc);
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if ((rc = set_hostid()))
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GOTO(out7, rc = -EADDRNOTAVAIL);
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if ((rc = set_kallsyms_lookup_name()))
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GOTO(out7, rc = -EADDRNOTAVAIL);
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printk("SPL: Loaded Solaris Porting Layer v%s\n", VERSION);
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RETURN(rc);
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out7:
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kstat_fini();
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out6:
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proc_fini();
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out5:
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vn_fini();
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out4:
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spl_taskq_fini();
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out3:
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spl_mutex_fini();
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out2:
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spl_kmem_fini();
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out:
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debug_fini();
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printk("SPL: Failed to Load Solaris Porting Layer v%s, "
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"rc = %d\n", VERSION, rc);
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return rc;
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}
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static void spl_fini(void)
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{
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ENTRY;
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printk("SPL: Unloaded Solaris Porting Layer v%s\n", VERSION);
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kstat_fini();
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proc_fini();
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vn_fini();
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spl_taskq_fini();
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spl_mutex_fini();
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spl_kmem_fini();
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debug_fini();
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}
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module_init(spl_init);
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module_exit(spl_fini);
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MODULE_AUTHOR("Lawrence Livermore National Labs");
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MODULE_DESCRIPTION("Solaris Porting Layer");
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MODULE_LICENSE("GPL");
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