ff8a07fda2
provider namespace. These are inserted dynamically into the VOP_..._AP() functions created from vnode_if.src. Each VOP has entry and return probes, as arg0 the primary vnode, arg1 the vnode operation argument structure pointer, providing access to IN and OUT arguments, and for return probes, arg2 the return value. MFC after: 1 month Sponsored by: Google, Inc.
446 lines
12 KiB
Awk
446 lines
12 KiB
Awk
#!/usr/bin/awk -f
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#-
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# Copyright (c) 1992, 1993
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# The Regents of the University of California. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 4. Neither the name of the University nor the names of its contributors
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# may be used to endorse or promote products derived from this software
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# without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# @(#)vnode_if.sh 8.1 (Berkeley) 6/10/93
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# $FreeBSD$
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#
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# Script to produce VFS front-end sugar.
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#
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# usage: vnode_if.awk <srcfile> [-c | -h | -p | -q]
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# (where <srcfile> is currently /sys/kern/vnode_if.src)
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# The source file must have a .src extension
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#
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function usage()
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{
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print "usage: vnode_if.awk <srcfile> [-c|-h|-p|-q]";
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exit 1;
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}
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function die(msg, what)
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{
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printf srcfile "(" fnr "): " > "/dev/stderr";
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printf msg "\n", what > "/dev/stderr";
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exit 1;
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}
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function t_spc(type)
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{
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# Append a space if the type is not a pointer
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return (type ~ /\*$/) ? type : type " ";
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}
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# These are just for convenience ...
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function printc(s) {print s > cfile;}
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function printh(s) {print s > hfile;}
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function printp(s) {print s > pfile;}
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function printq(s) {print s > qfile;}
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function add_debug_code(name, arg, pos, ind)
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{
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if (arg == "vpp")
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star = "*";
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else
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star = "";
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if (lockdata[name, arg, pos] && (lockdata[name, arg, pos] != "-")) {
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printc(ind"ASSERT_VI_UNLOCKED("star"a->a_"arg", \""uname"\");");
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# Add assertions for locking
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if (lockdata[name, arg, pos] == "L")
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printc(ind"ASSERT_VOP_LOCKED(" star "a->a_"arg", \""uname"\");");
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else if (lockdata[name, arg, pos] == "U")
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printc(ind"ASSERT_VOP_UNLOCKED(" star "a->a_"arg", \""uname"\");");
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else if (lockdata[name, arg, pos] == "E")
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printc(ind"ASSERT_VOP_ELOCKED(" star "a->a_"arg", \""uname"\");");
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else if (0) {
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# XXX More checks!
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}
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}
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}
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function add_pre(name)
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{
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if (lockdata[name, "pre"]) {
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printc("\t"lockdata[name, "pre"]"(a);");
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}
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}
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function add_post(name)
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{
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if (lockdata[name, "post"]) {
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printc("\t"lockdata[name, "post"]"(a, rc);");
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}
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}
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function find_arg_with_type (type)
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{
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for (jj = 0; jj < numargs; jj++) {
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if (types[jj] == type) {
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return "VOPARG_OFFSETOF(struct " \
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name "_args,a_" args[jj] ")";
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}
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}
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return "VDESC_NO_OFFSET";
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}
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BEGIN{
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# Process the command line
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for (i = 1; i < ARGC; i++) {
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arg = ARGV[i];
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if (arg !~ /^-[chpq]+$/ && arg !~ /\.src$/)
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usage();
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if (arg ~ /^-.*c/)
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cfile = "vnode_if.c";
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if (arg ~ /^-.*h/)
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hfile = "vnode_if.h";
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if (arg ~ /^-.*p/)
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pfile = "vnode_if_newproto.h";
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if (arg ~ /^-.*q/)
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qfile = "vnode_if_typedef.h";
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if (arg ~ /\.src$/)
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srcfile = arg;
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}
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ARGC = 1;
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if (!cfile && !hfile && !pfile && !qfile)
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exit 0;
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if (!srcfile)
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usage();
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common_head = \
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"/*\n" \
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" * This file is produced automatically.\n" \
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" * Do not modify anything in here by hand.\n" \
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" *\n" \
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" * Created from $FreeBSD$\n" \
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" */\n" \
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"\n";
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if (pfile) {
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printp(common_head)
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printp("struct vop_vector {")
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printp("\tstruct vop_vector\t*vop_default;")
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printp("\tvop_bypass_t\t*vop_bypass;")
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}
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if (qfile) {
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printq(common_head)
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}
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if (hfile) {
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printh(common_head "extern struct vnodeop_desc vop_default_desc;");
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printh("#include \"vnode_if_typedef.h\"")
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printh("#include \"vnode_if_newproto.h\"")
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}
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if (cfile) {
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printc(common_head \
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"#include \"opt_kdtrace.h\"\n" \
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"\n" \
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"#include <sys/param.h>\n" \
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"#include <sys/event.h>\n" \
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"#include <sys/kernel.h>\n" \
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"#include <sys/mount.h>\n" \
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"#include <sys/sdt.h>\n" \
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"#include <sys/systm.h>\n" \
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"#include <sys/vnode.h>\n" \
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"\n" \
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"SDT_PROVIDER_DECLARE(vfs);\n" \
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"\n" \
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"struct vnodeop_desc vop_default_desc = {\n" \
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" \"default\",\n" \
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" 0,\n" \
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" (vop_bypass_t *)vop_panic,\n" \
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" NULL,\n" \
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" VDESC_NO_OFFSET,\n" \
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" VDESC_NO_OFFSET,\n" \
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" VDESC_NO_OFFSET,\n" \
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" VDESC_NO_OFFSET,\n" \
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"};\n");
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}
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while ((getline < srcfile) > 0) {
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fnr++;
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if (NF == 0)
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continue;
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if ($1 ~ /^%%/) {
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if (NF != 6 ||
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$2 !~ /^[a-z]+$/ || $3 !~ /^[a-z]+$/ ||
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$4 !~ /^.$/ || $5 !~ /^.$/ || $6 !~ /^.$/) {
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die("Invalid %s construction", "%%");
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continue;
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}
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lockdata["vop_" $2, $3, "Entry"] = $4;
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lockdata["vop_" $2, $3, "OK"] = $5;
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lockdata["vop_" $2, $3, "Error"] = $6;
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continue;
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}
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if ($1 ~ /^%!/) {
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if (NF != 4 ||
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($3 != "pre" && $3 != "post")) {
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die("Invalid %s construction", "%!");
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continue;
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}
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lockdata["vop_" $2, $3] = $4;
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continue;
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}
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if ($1 ~ /^#/)
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continue;
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# Get the function name.
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name = $1;
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uname = toupper(name);
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# Start constructing a ktrpoint string
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ctrstr = "\"" uname;
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# Get the function arguments.
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for (numargs = 0; ; ++numargs) {
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if ((getline < srcfile) <= 0) {
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die("Unable to read through the arguments for \"%s\"",
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name);
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}
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fnr++;
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if ($1 ~ /^\};/)
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break;
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# Delete comments, if any.
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gsub (/\/\*.*\*\//, "");
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# Condense whitespace and delete leading/trailing space.
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gsub(/[[:space:]]+/, " ");
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sub(/^ /, "");
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sub(/ $/, "");
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# Pick off direction.
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if ($1 != "INOUT" && $1 != "IN" && $1 != "OUT")
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die("No IN/OUT direction for \"%s\".", $0);
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dirs[numargs] = $1;
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sub(/^[A-Z]* /, "");
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if ((reles[numargs] = $1) == "WILLRELE")
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sub(/^[A-Z]* /, "");
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else
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reles[numargs] = "WONTRELE";
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# kill trailing ;
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if (sub(/;$/, "") < 1)
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die("Missing end-of-line ; in \"%s\".", $0);
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# pick off variable name
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if ((argp = match($0, /[A-Za-z0-9_]+$/)) < 1)
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die("Missing var name \"a_foo\" in \"%s\".", $0);
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args[numargs] = substr($0, argp);
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$0 = substr($0, 1, argp - 1);
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# what is left must be type
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# remove trailing space (if any)
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sub(/ $/, "");
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types[numargs] = $0;
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# We can do a maximum of 6 arguments to CTR*
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if (numargs <= 6) {
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if (numargs == 0)
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ctrstr = ctrstr "(" args[numargs];
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else
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ctrstr = ctrstr ", " args[numargs];
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if (types[numargs] ~ /\*/)
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ctrstr = ctrstr " 0x%lX";
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else
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ctrstr = ctrstr " %ld";
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}
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}
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if (numargs > 6)
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ctrargs = 6;
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else
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ctrargs = numargs;
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ctrstr = "\tCTR" ctrargs "(KTR_VOP,\n\t " ctrstr ")\",\n\t ";
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ctrstr = ctrstr "a->a_" args[0];
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for (i = 1; i < ctrargs; ++i)
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ctrstr = ctrstr ", a->a_" args[i];
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ctrstr = ctrstr ");";
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if (pfile) {
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printp("\t"name"_t\t*"name";")
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}
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if (qfile) {
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printq("struct "name"_args;")
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printq("typedef int "name"_t(struct "name"_args *);\n")
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}
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if (hfile) {
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# Print out the vop_F_args structure.
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printh("struct "name"_args {\n\tstruct vop_generic_args a_gen;");
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for (i = 0; i < numargs; ++i)
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printh("\t" t_spc(types[i]) "a_" args[i] ";");
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printh("};");
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printh("");
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# Print out extern declaration.
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printh("extern struct vnodeop_desc " name "_desc;");
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printh("");
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# Print out function prototypes.
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printh("int " uname "_AP(struct " name "_args *);");
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printh("int " uname "_APV(struct vop_vector *vop, struct " name "_args *);");
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printh("");
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printh("static __inline int " uname "(");
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for (i = 0; i < numargs; ++i) {
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printh("\t" t_spc(types[i]) args[i] \
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(i < numargs - 1 ? "," : ")"));
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}
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printh("{");
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printh("\tstruct " name "_args a;");
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printh("");
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printh("\ta.a_gen.a_desc = &" name "_desc;");
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for (i = 0; i < numargs; ++i)
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printh("\ta.a_" args[i] " = " args[i] ";");
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printh("\treturn (" uname "_APV("args[0]"->v_op, &a));");
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printh("}");
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printh("");
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}
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if (cfile) {
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# Print out the vop_F_vp_offsets structure. This all depends
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# on naming conventions and nothing else.
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printc("static int " name "_vp_offsets[] = {");
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# as a side effect, figure out the releflags
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releflags = "";
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vpnum = 0;
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for (i = 0; i < numargs; i++) {
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if (types[i] == "struct vnode *") {
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printc("\tVOPARG_OFFSETOF(struct " name \
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"_args,a_" args[i] "),");
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if (reles[i] == "WILLRELE") {
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releflags = releflags \
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"|VDESC_VP" vpnum "_WILLRELE";
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}
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vpnum++;
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}
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}
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sub(/^\|/, "", releflags);
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printc("\tVDESC_NO_OFFSET");
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printc("};");
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printc("\n");
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printc("SDT_PROBE_DEFINE2(vfs, vop, " name ", entry, \"struct vnode *\", \"struct " name "_args *\");\n");
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printc("SDT_PROBE_DEFINE3(vfs, vop, " name ", return, \"struct vnode *\", \"struct " name "_args *\", \"int\");\n");
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# Print out function.
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printc("\nint\n" uname "_AP(struct " name "_args *a)");
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printc("{");
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printc("");
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printc("\treturn(" uname "_APV(a->a_" args[0] "->v_op, a));");
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printc("}");
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printc("\nint\n" uname "_APV(struct vop_vector *vop, struct " name "_args *a)");
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printc("{");
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printc("\tint rc;");
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printc("");
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printc("\tVNASSERT(a->a_gen.a_desc == &" name "_desc, a->a_" args[0]",");
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printc("\t (\"Wrong a_desc in " name "(%p, %p)\", a->a_" args[0]", a));");
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printc("\twhile(vop != NULL && \\");
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printc("\t vop->"name" == NULL && vop->vop_bypass == NULL)")
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printc("\t\tvop = vop->vop_default;")
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printc("\tVNASSERT(vop != NULL, a->a_" args[0]", (\"No "name"(%p, %p)\", a->a_" args[0]", a));")
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printc("\tSDT_PROBE(vfs, vop, " name ", entry, a->a_" args[0] ", a, 0, 0, 0);\n");
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for (i = 0; i < numargs; ++i)
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add_debug_code(name, args[i], "Entry", "\t");
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add_pre(name);
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printc("\tif (vop->"name" != NULL)")
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printc("\t\trc = vop->"name"(a);")
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printc("\telse")
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printc("\t\trc = vop->vop_bypass(&a->a_gen);")
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printc(ctrstr);
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printc("\tSDT_PROBE(vfs, vop, " name ", return, a->a_" args[0] ", a, rc, 0, 0);\n");
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printc("\tif (rc == 0) {");
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for (i = 0; i < numargs; ++i)
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add_debug_code(name, args[i], "OK", "\t\t");
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printc("\t} else {");
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for (i = 0; i < numargs; ++i)
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add_debug_code(name, args[i], "Error", "\t\t");
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printc("\t}");
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add_post(name);
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printc("\treturn (rc);");
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printc("}\n");
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# Print out the vnodeop_desc structure.
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printc("struct vnodeop_desc " name "_desc = {");
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# printable name
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printc("\t\"" name "\",");
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# flags
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vppwillrele = "";
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for (i = 0; i < numargs; i++) {
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if (types[i] == "struct vnode **" && \
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reles[i] == "WILLRELE") {
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vppwillrele = "|VDESC_VPP_WILLRELE";
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}
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}
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if (!releflags)
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releflags = "0";
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printc("\t" releflags vppwillrele ",");
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# function to call
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printc("\t(vop_bypass_t *)" uname "_AP,");
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# vp offsets
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printc("\t" name "_vp_offsets,");
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# vpp (if any)
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printc("\t" find_arg_with_type("struct vnode **") ",");
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# cred (if any)
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printc("\t" find_arg_with_type("struct ucred *") ",");
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# thread (if any)
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printc("\t" find_arg_with_type("struct thread *") ",");
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# componentname
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printc("\t" find_arg_with_type("struct componentname *") ",");
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# transport layer information
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printc("};\n");
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}
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}
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if (pfile)
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printp("};")
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if (hfile)
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close(hfile);
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if (cfile)
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close(cfile);
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if (pfile)
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close(pfile);
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close(srcfile);
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exit 0;
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}
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