4e61198e8f
leaked memory on each unload and were limited to items referenced in the kernel copy of vnode_if.c. Now a kernel module is free to create it's own VOP_FOO() routines and the rest of the system will happily deal with it, including passthrough layers like union/umap/etc. Have VFS_SET() call a common vfs_modevent() handler rather than inline duplicating the common code all over the place. Have VNODEOP_SET() have the vnodeops removed at unload time (assuming a module) so that the vop_t ** vector is reclaimed. Slightly adjust the vop_t ** vectors so that calling slot 0 is a panic rather than a page fault. This could happen if VOP_something() was called without *any* handlers being present anywhere (including in vfs_default.c). slot 1 becomes the default vector for the vnodeop table. TODO: reclaim zones on unload (eg: nfs code)
403 lines
10 KiB
Awk
403 lines
10 KiB
Awk
#!/bin/sh -
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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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# 3. All advertising materials mentioning features or use of this software
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# must display the following acknowledgement:
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# This product includes software developed by the University of
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# California, Berkeley and its contributors.
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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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# $Id: vnode_if.sh,v 1.15 1998/07/04 20:45:32 julian Exp $
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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.sh srcfile
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# (where srcfile is currently /sys/kern/vnode_if.src)
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#
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# These awk scripts are not particularly well written, specifically they
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# don't use arrays well and figure out the same information repeatedly.
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# Please rewrite them if you actually understand how to use awk. Note,
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# they use nawk extensions and gawk's toupper.
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if [ $# -ne 1 ] ; then
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echo 'usage: vnode_if.sh srcfile'
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exit 1
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fi
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# Name of the source file.
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SRC=$1
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# Names of the created files.
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CFILE=vnode_if.c
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HEADER=vnode_if.h
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# Awk program (must support nawk extensions and gawk's "toupper")
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# Use "awk" at Berkeley, "gawk" elsewhere.
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AWK=awk
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# Print out header information for vnode_if.h.
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cat << END_OF_LEADING_COMMENT > $HEADER
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/*
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* This file is produced automatically.
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* Do not modify anything in here by hand.
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*
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* Created from @(#)vnode_if.sh 8.1 (Berkeley) 6/10/93
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*/
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extern struct vnodeop_desc vop_default_desc;
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END_OF_LEADING_COMMENT
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# Awk script to take vnode_if.src and turn it into vnode_if.h.
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$AWK '
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NF == 0 || $0 ~ "^#" {
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next;
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}
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{
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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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# Get the function arguments.
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for (c1 = 0;; ++c1) {
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if (getline <= 0)
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exit
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if ($0 ~ "^};")
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break;
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a[c1] = $0;
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}
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# Print out the vop_F_args structure.
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printf("struct %s_args {\n\tstruct vnodeop_desc *a_desc;\n",
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name);
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for (c2 = 0; c2 < c1; ++c2) {
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c3 = split(a[c2], t);
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printf("\t");
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if (t[2] ~ "WILLRELE")
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c4 = 3;
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else
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c4 = 2;
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for (; c4 < c3; ++c4)
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printf("%s ", t[c4]);
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beg = match(t[c3], "[^*]");
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printf("%sa_%s\n",
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substr(t[c4], 0, beg - 1), substr(t[c4], beg));
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}
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printf("};\n");
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# Print out extern declaration.
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printf("extern struct vnodeop_desc %s_desc;\n", name);
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# Print out prototype.
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printf("static int %s __P((\n", uname);
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sep = ",\n";
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for (c2 = 0; c2 < c1; ++c2) {
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if (c2 == c1 - 1)
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sep = "));\n";
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c3 = split(a[c2], t);
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printf("\t");
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if (t[2] ~ "WILLRELE")
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c4 = 3;
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else
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c4 = 2;
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for (; c4 < c3; ++c4)
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printf("%s ", t[c4]);
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beg = match(t[c3], "[^*]");
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end = match(t[c3], ";");
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printf("%s%s%s",
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substr(t[c4], 0, beg - 1),
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substr(t[c4], beg, end - beg), sep);
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}
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# Print out inline struct.
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printf("static __inline int %s(", uname);
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sep = ", ";
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for (c2 = 0; c2 < c1; ++c2) {
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if (c2 == c1 - 1)
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sep = ")\n";
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c3 = split(a[c2], t);
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beg = match(t[c3], "[^*]");
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end = match(t[c3], ";");
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printf("%s%s", substr(t[c3], beg, end - beg), sep);
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}
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for (c2 = 0; c2 < c1; ++c2) {
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c3 = split(a[c2], t);
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printf("\t");
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if (t[2] ~ "WILLRELE")
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c4 = 3;
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else
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c4 = 2;
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for (; c4 < c3; ++c4)
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printf("%s ", t[c4]);
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beg = match(t[c3], "[^*]");
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printf("%s%s\n",
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substr(t[c4], 0, beg - 1), substr(t[c4], beg));
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}
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printf("{\n\tstruct %s_args a;\n\n", name);
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printf("\ta.a_desc = VDESC(%s);\n", name);
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for (c2 = 0; c2 < c1; ++c2) {
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c3 = split(a[c2], t);
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printf("\t");
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beg = match(t[c3], "[^*]");
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end = match(t[c3], ";");
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printf("a.a_%s = %s\n",
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substr(t[c3], beg, end - beg), substr(t[c3], beg));
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}
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c1 = split(a[0], t);
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beg = match(t[c1], "[^*]");
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end = match(t[c1], ";");
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printf("\treturn (VCALL(%s, VOFFSET(%s), &a));\n}\n",
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substr(t[c1], beg, end - beg), name);
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}' < $SRC >> $HEADER
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# Print out header information for vnode_if.c.
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cat << END_OF_LEADING_COMMENT > $CFILE
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/*
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* This file is produced automatically.
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* Do not modify anything in here by hand.
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*
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* Created from @(#)vnode_if.sh 8.1 (Berkeley) 6/10/93
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*/
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#include <sys/param.h>
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#include <sys/vnode.h>
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struct vnodeop_desc vop_default_desc = {
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1, /* special case, vop_default => 1 */
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"default",
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0,
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NULL,
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VDESC_NO_OFFSET,
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VDESC_NO_OFFSET,
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VDESC_NO_OFFSET,
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VDESC_NO_OFFSET,
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NULL,
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};
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END_OF_LEADING_COMMENT
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# Awk script to take vnode_if.src and turn it into vnode_if.c.
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$AWK 'function kill_surrounding_ws (s) {
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sub (/^[ \t]*/, "", s);
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sub (/[ \t]*$/, "", s);
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return s;
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}
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function read_args() {
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numargs = 0;
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while (getline ln) {
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if (ln ~ /}/) {
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break;
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};
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# Delete comments, if any.
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gsub (/\/\*.*\*\//, "", ln);
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# Delete leading/trailing space.
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ln = kill_surrounding_ws(ln);
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# Pick off direction.
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if (1 == sub(/^INOUT[ \t]+/, "", ln))
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dir = "INOUT";
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else if (1 == sub(/^IN[ \t]+/, "", ln))
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dir = "IN";
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else if (1 == sub(/^OUT[ \t]+/, "", ln))
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dir = "OUT";
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else
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bail("No IN/OUT direction for \"" ln "\".");
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# check for "WILLRELE"
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if (1 == sub(/^WILLRELE[ \t]+/, "", ln)) {
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rele = "WILLRELE";
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} else {
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rele = "WONTRELE";
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};
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# kill trailing ;
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if (1 != sub (/;$/, "", ln)) {
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bail("Missing end-of-line ; in \"" ln "\".");
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};
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# pick off variable name
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if (!(i = match(ln, /[A-Za-z0-9_]+$/))) {
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bail("Missing var name \"a_foo\" in \"" ln "\".");
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};
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arg = substr (ln, i);
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# Want to <<substr(ln, i) = "";>>, but nawk cannot.
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# Hack around this.
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ln = substr(ln, 1, i-1);
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# what is left must be type
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# (put clean it up some)
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type = ln;
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gsub (/[ \t]+/, " ", type); # condense whitespace
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type = kill_surrounding_ws(type);
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# (boy this was easier in Perl)
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numargs++;
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dirs[numargs] = dir;
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reles[numargs] = rele;
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types[numargs] = type;
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args[numargs] = arg;
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};
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}
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function generate_operation_vp_offsets() {
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printf ("static int %s_vp_offsets[] = {\n", name);
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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=1; i<=numargs; i++) {
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if (types[i] == "struct vnode *") {
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printf ("\tVOPARG_OFFSETOF(struct %s_args,a_%s),\n",
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name, args[i]);
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if (reles[i] == "WILLRELE") {
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releflags = releflags "|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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print "\tVDESC_NO_OFFSET";
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print "};";
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}
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function find_arg_with_type (type) {
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for (i=1; i<=numargs; i++) {
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if (types[i] == type) {
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return "VOPARG_OFFSETOF(struct " name "_args,a_" args[i] ")";
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};
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};
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return "VDESC_NO_OFFSET";
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}
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function generate_operation_desc() {
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printf ("struct vnodeop_desc %s_desc = {\n", name);
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# offset
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printf ("\t0,\n");
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# printable name
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printf ("\t\"%s\",\n", name);
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# flags
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vppwillrele = "";
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for (i=1; 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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printf ("\t0%s,\n", vppwillrele);
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} else {
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printf ("\t%s%s,\n", releflags, vppwillrele);
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};
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# vp offsets
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printf ("\t%s_vp_offsets,\n", name);
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# vpp (if any)
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printf ("\t%s,\n", find_arg_with_type("struct vnode **"));
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# cred (if any)
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printf ("\t%s,\n", find_arg_with_type("struct ucred *"));
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# proc (if any)
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printf ("\t%s,\n", find_arg_with_type("struct proc *"));
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# componentname
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printf ("\t%s,\n", find_arg_with_type("struct componentname *"));
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# transport layer information
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printf ("\tNULL,\n};\n");
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}
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NF == 0 || $0 ~ "^#" {
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next;
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}
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{
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# get the function name
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name = $1;
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# get the function arguments
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read_args();
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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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generate_operation_vp_offsets();
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# Print out the vnodeop_desc structure.
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generate_operation_desc();
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printf "\n";
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}' < $SRC >> $CFILE
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# THINGS THAT DON'T WORK RIGHT YET.
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#
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# Two existing BSD vnodeops (bwrite and strategy) don't take any vnodes as
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# arguments. This means that these operations can't function successfully
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# through a bypass routine.
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#
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# Bwrite and strategy will be replaced when the VM page/buffer cache
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# integration happens.
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#
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# To get around this problem for now we handle these ops as special cases.
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cat << END_OF_SPECIAL_CASES >> $HEADER
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#include <sys/buf.h>
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struct vop_bwrite_args {
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struct vnodeop_desc *a_desc;
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struct buf *a_bp;
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};
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extern struct vnodeop_desc vop_bwrite_desc;
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static int VOP_BWRITE __P((
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struct buf *bp));
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static __inline int VOP_BWRITE(bp)
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struct buf *bp;
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{
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struct vop_bwrite_args a;
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a.a_desc = VDESC(vop_bwrite);
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a.a_bp = bp;
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return (VCALL((bp)->b_vp, VOFFSET(vop_bwrite), &a));
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}
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extern int vfs_opv_numops;
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END_OF_SPECIAL_CASES
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cat << END_OF_SPECIAL_CASES >> $CFILE
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static int vop_bwrite_vp_offsets[] = {
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VDESC_NO_OFFSET
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};
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struct vnodeop_desc vop_bwrite_desc = {
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0,
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"vop_bwrite",
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0,
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vop_bwrite_vp_offsets,
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VDESC_NO_OFFSET,
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VDESC_NO_OFFSET,
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VDESC_NO_OFFSET,
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VDESC_NO_OFFSET,
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NULL,
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};
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END_OF_SPECIAL_CASES
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