1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
|
#!/bin/sh -
#
# Copyright (c) 1992, 1993
# The Regents of the University of California. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
# must display the following acknowledgement:
# This product includes software developed by the University of
# California, Berkeley and its contributors.
# 4. Neither the name of the University nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# @(#)vnode_if.sh 8.1 (Berkeley) 6/10/93
# $Id: vnode_if.sh,v 1.12 1997/09/10 20:11:02 phk Exp $
#
# Script to produce VFS front-end sugar.
#
# usage: vnode_if.sh srcfile
# (where srcfile is currently /sys/kern/vnode_if.src)
#
# These awk scripts are not particularly well written, specifically they
# don't use arrays well and figure out the same information repeatedly.
# Please rewrite them if you actually understand how to use awk. Note,
# they use nawk extensions and gawk's toupper.
if [ $# -ne 1 ] ; then
echo 'usage: vnode_if.sh srcfile'
exit 1
fi
# Name of the source file.
SRC=$1
# Names of the created files.
CFILE=vnode_if.c
HEADER=vnode_if.h
# Awk program (must support nawk extensions and gawk's "toupper")
# Use "awk" at Berkeley, "gawk" elsewhere.
AWK=awk
# Print out header information for vnode_if.h.
cat << END_OF_LEADING_COMMENT > $HEADER
/*
* This file is produced automatically.
* Do not modify anything in here by hand.
*
* Created from @(#)vnode_if.sh 8.1 (Berkeley) 6/10/93
*/
extern struct vnodeop_desc vop_default_desc;
END_OF_LEADING_COMMENT
# Awk script to take vnode_if.src and turn it into vnode_if.h.
$AWK '
NF == 0 || $0 ~ "^#" {
next;
}
{
# Get the function name.
name = $1;
uname = toupper(name);
# Get the function arguments.
for (c1 = 0;; ++c1) {
if (getline <= 0)
exit
if ($0 ~ "^};")
break;
a[c1] = $0;
}
# Print out the vop_F_args structure.
printf("struct %s_args {\n\tstruct vnodeop_desc *a_desc;\n",
name);
for (c2 = 0; c2 < c1; ++c2) {
c3 = split(a[c2], t);
printf("\t");
if (t[2] ~ "WILLRELE")
c4 = 3;
else
c4 = 2;
for (; c4 < c3; ++c4)
printf("%s ", t[c4]);
beg = match(t[c3], "[^*]");
printf("%sa_%s\n",
substr(t[c4], 0, beg - 1), substr(t[c4], beg));
}
printf("};\n");
# Print out extern declaration.
printf("extern struct vnodeop_desc %s_desc;\n", name);
# Print out prototype.
printf("static int %s __P((\n", uname);
sep = ",\n";
for (c2 = 0; c2 < c1; ++c2) {
if (c2 == c1 - 1)
sep = "));\n";
c3 = split(a[c2], t);
printf("\t");
if (t[2] ~ "WILLRELE")
c4 = 3;
else
c4 = 2;
for (; c4 < c3; ++c4)
printf("%s ", t[c4]);
beg = match(t[c3], "[^*]");
end = match(t[c3], ";");
printf("%s%s%s",
substr(t[c4], 0, beg - 1),
substr(t[c4], beg, end - beg), sep);
}
# Print out inline struct.
printf("static inline int %s(", uname);
sep = ", ";
for (c2 = 0; c2 < c1; ++c2) {
if (c2 == c1 - 1)
sep = ")\n";
c3 = split(a[c2], t);
beg = match(t[c3], "[^*]");
end = match(t[c3], ";");
printf("%s%s", substr(t[c3], beg, end - beg), sep);
}
for (c2 = 0; c2 < c1; ++c2) {
c3 = split(a[c2], t);
printf("\t");
if (t[2] ~ "WILLRELE")
c4 = 3;
else
c4 = 2;
for (; c4 < c3; ++c4)
printf("%s ", t[c4]);
beg = match(t[c3], "[^*]");
printf("%s%s\n",
substr(t[c4], 0, beg - 1), substr(t[c4], beg));
}
printf("{\n\tstruct %s_args a;\n\n", name);
printf("\ta.a_desc = VDESC(%s);\n", name);
for (c2 = 0; c2 < c1; ++c2) {
c3 = split(a[c2], t);
printf("\t");
beg = match(t[c3], "[^*]");
end = match(t[c3], ";");
printf("a.a_%s = %s\n",
substr(t[c3], beg, end - beg), substr(t[c3], beg));
}
c1 = split(a[0], t);
beg = match(t[c1], "[^*]");
end = match(t[c1], ";");
printf("\treturn (VCALL(%s, VOFFSET(%s), &a));\n}\n",
substr(t[c1], beg, end - beg), name);
}' < $SRC >> $HEADER
# Print out header information for vnode_if.c.
cat << END_OF_LEADING_COMMENT > $CFILE
/*
* This file is produced automatically.
* Do not modify anything in here by hand.
*
* Created from @(#)vnode_if.sh 8.1 (Berkeley) 6/10/93
*/
#include <sys/param.h>
#include <sys/vnode.h>
struct vnodeop_desc vop_default_desc = {
0,
"default",
0,
NULL,
VDESC_NO_OFFSET,
VDESC_NO_OFFSET,
VDESC_NO_OFFSET,
VDESC_NO_OFFSET,
NULL,
};
END_OF_LEADING_COMMENT
# Awk script to take vnode_if.src and turn it into vnode_if.c.
$AWK 'function kill_surrounding_ws (s) {
sub (/^[ \t]*/, "", s);
sub (/[ \t]*$/, "", s);
return s;
}
function read_args() {
numargs = 0;
while (getline ln) {
if (ln ~ /}/) {
break;
};
# Delete comments, if any.
gsub (/\/\*.*\*\//, "", ln);
# Delete leading/trailing space.
ln = kill_surrounding_ws(ln);
# Pick off direction.
if (1 == sub(/^INOUT[ \t]+/, "", ln))
dir = "INOUT";
else if (1 == sub(/^IN[ \t]+/, "", ln))
dir = "IN";
else if (1 == sub(/^OUT[ \t]+/, "", ln))
dir = "OUT";
else
bail("No IN/OUT direction for \"" ln "\".");
# check for "WILLRELE"
if (1 == sub(/^WILLRELE[ \t]+/, "", ln)) {
rele = "WILLRELE";
} else {
rele = "WONTRELE";
};
# kill trailing ;
if (1 != sub (/;$/, "", ln)) {
bail("Missing end-of-line ; in \"" ln "\".");
};
# pick off variable name
if (!(i = match(ln, /[A-Za-z0-9_]+$/))) {
bail("Missing var name \"a_foo\" in \"" ln "\".");
};
arg = substr (ln, i);
# Want to <<substr(ln, i) = "";>>, but nawk cannot.
# Hack around this.
ln = substr(ln, 1, i-1);
# what is left must be type
# (put clean it up some)
type = ln;
gsub (/[ \t]+/, " ", type); # condense whitespace
type = kill_surrounding_ws(type);
# (boy this was easier in Perl)
numargs++;
dirs[numargs] = dir;
reles[numargs] = rele;
types[numargs] = type;
args[numargs] = arg;
};
}
function generate_operation_vp_offsets() {
printf ("static int %s_vp_offsets[] = {\n", name);
# as a side effect, figure out the releflags
releflags = "";
vpnum = 0;
for (i=1; i<=numargs; i++) {
if (types[i] == "struct vnode *") {
printf ("\tVOPARG_OFFSETOF(struct %s_args,a_%s),\n",
name, args[i]);
if (reles[i] == "WILLRELE") {
releflags = releflags "|VDESC_VP" vpnum "_WILLRELE";
};
vpnum++;
};
};
sub (/^\|/, "", releflags);
print "\tVDESC_NO_OFFSET";
print "};";
}
function find_arg_with_type (type) {
for (i=1; i<=numargs; i++) {
if (types[i] == type) {
return "VOPARG_OFFSETOF(struct " name "_args,a_" args[i] ")";
};
};
return "VDESC_NO_OFFSET";
}
function generate_operation_desc() {
printf ("struct vnodeop_desc %s_desc = {\n", name);
# offset
printf ("\t0,\n");
# printable name
printf ("\t\"%s\",\n", name);
# flags
vppwillrele = "";
for (i=1; i<=numargs; i++) {
if (types[i] == "struct vnode **" &&
(reles[i] == "WILLRELE")) {
vppwillrele = "|VDESC_VPP_WILLRELE";
};
};
if (releflags == "") {
printf ("\t0%s,\n", vppwillrele);
} else {
printf ("\t%s%s,\n", releflags, vppwillrele);
};
# vp offsets
printf ("\t%s_vp_offsets,\n", name);
# vpp (if any)
printf ("\t%s,\n", find_arg_with_type("struct vnode **"));
# cred (if any)
printf ("\t%s,\n", find_arg_with_type("struct ucred *"));
# proc (if any)
printf ("\t%s,\n", find_arg_with_type("struct proc *"));
# componentname
printf ("\t%s,\n", find_arg_with_type("struct componentname *"));
# transport layer information
printf ("\tNULL,\n};\n");
}
NF == 0 || $0 ~ "^#" {
next;
}
{
# get the function name
name = $1;
# get the function arguments
read_args();
# Print out the vop_F_vp_offsets structure. This all depends
# on naming conventions and nothing else.
generate_operation_vp_offsets();
# Print out the vnodeop_desc structure.
generate_operation_desc();
printf "\n";
}' < $SRC >> $CFILE
# THINGS THAT DON'T WORK RIGHT YET.
#
# Two existing BSD vnodeops (bwrite and strategy) don't take any vnodes as
# arguments. This means that these operations can't function successfully
# through a bypass routine.
#
# Bwrite and strategy will be replaced when the VM page/buffer cache
# integration happens.
#
# To get around this problem for now we handle these ops as special cases.
cat << END_OF_SPECIAL_CASES >> $HEADER
#include <sys/buf.h>
struct vop_strategy_args {
struct vnodeop_desc *a_desc;
struct buf *a_bp;
};
extern struct vnodeop_desc vop_strategy_desc;
static int VOP_STRATEGY __P((
struct buf *bp));
static inline int VOP_STRATEGY(bp)
struct buf *bp;
{
struct vop_strategy_args a;
a.a_desc = VDESC(vop_strategy);
a.a_bp = bp;
return (VCALL((bp)->b_vp, VOFFSET(vop_strategy), &a));
}
struct vop_bwrite_args {
struct vnodeop_desc *a_desc;
struct buf *a_bp;
};
extern struct vnodeop_desc vop_bwrite_desc;
static int VOP_BWRITE __P((
struct buf *bp));
static inline int VOP_BWRITE(bp)
struct buf *bp;
{
struct vop_bwrite_args a;
a.a_desc = VDESC(vop_bwrite);
a.a_bp = bp;
return (VCALL((bp)->b_vp, VOFFSET(vop_bwrite), &a));
}
extern int vfs_opv_numops;
END_OF_SPECIAL_CASES
cat << END_OF_SPECIAL_CASES >> $CFILE
static int vop_strategy_vp_offsets[] = {
VDESC_NO_OFFSET
};
struct vnodeop_desc vop_strategy_desc = {
0,
"vop_strategy",
0,
vop_strategy_vp_offsets,
VDESC_NO_OFFSET,
VDESC_NO_OFFSET,
VDESC_NO_OFFSET,
VDESC_NO_OFFSET,
NULL,
};
static int vop_bwrite_vp_offsets[] = {
VDESC_NO_OFFSET
};
struct vnodeop_desc vop_bwrite_desc = {
0,
"vop_bwrite",
0,
vop_bwrite_vp_offsets,
VDESC_NO_OFFSET,
VDESC_NO_OFFSET,
VDESC_NO_OFFSET,
VDESC_NO_OFFSET,
NULL,
};
END_OF_SPECIAL_CASES
# Add the vfs_op_descs array to the C file.
$AWK '
BEGIN {
printf("\nstruct vnodeop_desc *vfs_op_descs[] = {\n");
printf("\t&vop_default_desc, /* MUST BE FIRST */\n");
printf("\t&vop_strategy_desc, /* XXX: SPECIAL CASE */\n");
printf("\t&vop_bwrite_desc, /* XXX: SPECIAL CASE */\n");
}
END {
printf("\tNULL\n};\n");
}
NF == 0 || $0 ~ "^#" {
next;
}
{
# Get the function name.
printf("\t&%s_desc,\n", $1);
# Skip the function arguments.
for (;;) {
if (getline <= 0)
exit
if ($0 ~ "^};")
break;
}
}' < $SRC >> $CFILE
cat << END_OF_NUMOPS_CODE >> $CFILE
/*
* the -1 is to account for the NULL
* XXX is the NULL still necessary? I don't think so...
*/
int vfs_opv_numops = (sizeof(vfs_op_descs)/sizeof(struct vnodeop_desc *)) - 1;
END_OF_NUMOPS_CODE
|