Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/tools/vnode_if.awk
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1 #!/usr/bin/awk -f 2 3 #- 4 # SPDX-License-Identifier: BSD-3-Clause 5 # 6 # Copyright (c) 1992, 1993 7 # The Regents of the University of California. All rights reserved. 8 # 9 # Redistribution and use in source and binary forms, with or without 10 # modification, are permitted provided that the following conditions 11 # are met: 12 # 1. Redistributions of source code must retain the above copyright 13 # notice, this list of conditions and the following disclaimer. 14 # 2. Redistributions in binary form must reproduce the above copyright 15 # notice, this list of conditions and the following disclaimer in the 16 # documentation and/or other materials provided with the distribution. 17 # 3. Neither the name of the University nor the names of its contributors 18 # may be used to endorse or promote products derived from this software 19 # without specific prior written permission. 20 # 21 # THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 # ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 # SUCH DAMAGE. 32 33 # 34 # @(#)vnode_if.sh 8.1 (Berkeley) 6/10/93 35 # $FreeBSD$ 36 # 37 # Script to produce VFS front-end sugar. 38 # 39 # usage: vnode_if.awk <srcfile> [-c | -h | -p | -q] 40 # (where <srcfile> is currently /sys/kern/vnode_if.src) 41 # The source file must have a .src extension 42 # 43 44 function usage() 45 { 46 print "usage: vnode_if.awk <srcfile> [-c|-h|-p|-q]"; 47 exit 1; 48 } 49 50 function die(msg, what) 51 { 52 printf srcfile "(" fnr "): " > "/dev/stderr"; 53 printf msg "\n", what > "/dev/stderr"; 54 exit 1; 55 } 56 57 function t_spc(type) 58 { 59 # Append a space if the type is not a pointer 60 return (type ~ /\*$/) ? type : type " "; 61 } 62 63 # These are just for convenience ... 64 function printc(s) {print s > cfile;} 65 function printh(s) {print s > hfile;} 66 function printp(s) {print s > pfile;} 67 function printq(s) {print s > qfile;} 68 69 function add_debug_code(name, arg, pos, ind) 70 { 71 if (arg == "vpp") 72 star = "*"; 73 else 74 star = ""; 75 if (lockdata[name, arg, pos] && (lockdata[name, arg, pos] != "-")) { 76 printc(ind"ASSERT_VI_UNLOCKED("star"a->a_"arg", \""uname" "pos" ("arg")\");"); 77 # Add assertions for locking 78 if (lockdata[name, arg, pos] == "L") 79 printc(ind"ASSERT_VOP_LOCKED(" star "a->a_"arg", \""uname" "pos" ("arg")\");"); 80 else if (lockdata[name, arg, pos] == "U") 81 printc(ind"ASSERT_VOP_UNLOCKED(" star "a->a_"arg", \""uname" "pos" ("arg")\");"); 82 else if (lockdata[name, arg, pos] == "E") 83 printc(ind"ASSERT_VOP_ELOCKED(" star "a->a_"arg", \""uname" "pos" ("arg")\");"); 84 else if (0) { 85 # XXX More checks! 86 } 87 } 88 } 89 90 function add_debugpre(name) 91 { 92 if (lockdata[name, "debugpre"]) { 93 printc("#ifdef DEBUG_VFS_LOCKS"); 94 printc("\t"lockdata[name, "debugpre"]"(a);"); 95 printc("#endif"); 96 } 97 } 98 99 function add_debugpost(name) 100 { 101 if (lockdata[name, "debugpost"]) { 102 printc("#ifdef DEBUG_VFS_LOCKS"); 103 printc("\t"lockdata[name, "debugpost"]"(a, rc);"); 104 printc("#endif"); 105 } 106 } 107 108 function add_pre(name) 109 { 110 if (lockdata[name, "pre"]) { 111 printc("\t"lockdata[name, "pre"]"(a);"); 112 } 113 } 114 115 function add_post(name) 116 { 117 if (lockdata[name, "post"]) { 118 printc("\t"lockdata[name, "post"]"(a, rc);"); 119 } 120 } 121 122 function can_inline(name) 123 { 124 if (lockdata[name, "pre"]) 125 return 0; 126 if (lockdata[name, "post"]) 127 return 0; 128 return 1; 129 } 130 131 function find_arg_with_type (type) 132 { 133 for (jj = 0; jj < numargs; jj++) { 134 if (types[jj] == type) { 135 return "VOPARG_OFFSETOF(struct " \ 136 name "_args,a_" args[jj] ")"; 137 } 138 } 139 140 return "VDESC_NO_OFFSET"; 141 } 142 143 BEGIN{ 144 145 # Process the command line 146 for (i = 1; i < ARGC; i++) { 147 arg = ARGV[i]; 148 if (arg !~ /^-[chpq]+$/ && arg !~ /\.src$/) 149 usage(); 150 if (arg ~ /^-.*c/) 151 cfile = "vnode_if.c"; 152 if (arg ~ /^-.*h/) 153 hfile = "vnode_if.h"; 154 if (arg ~ /^-.*p/) 155 pfile = "vnode_if_newproto.h"; 156 if (arg ~ /^-.*q/) 157 qfile = "vnode_if_typedef.h"; 158 if (arg ~ /\.src$/) 159 srcfile = arg; 160 } 161 ARGC = 1; 162 163 if (!cfile && !hfile && !pfile && !qfile) 164 exit 0; 165 166 if (!srcfile) 167 usage(); 168 169 # Avoid a literal generated file tag here. 170 generated = "@" "generated"; 171 172 common_head = \ 173 "/*\n" \ 174 " * This file is " generated " automatically.\n" \ 175 " * Do not modify anything in here by hand.\n" \ 176 " *\n" \ 177 " * Created from $FreeBSD$\n" \ 178 " */\n" \ 179 "\n"; 180 181 if (pfile) { 182 printp(common_head) 183 printp("struct vop_vector {") 184 printp("\tstruct vop_vector\t*vop_default;") 185 printp("\tvop_bypass_t\t*vop_bypass;") 186 } 187 188 if (qfile) { 189 printq(common_head) 190 } 191 192 if (hfile) { 193 printh(common_head "extern struct vnodeop_desc vop_default_desc;"); 194 printh("#include \"vnode_if_typedef.h\"") 195 printh("#include \"vnode_if_newproto.h\"") 196 } 197 198 if (cfile) { 199 printc(common_head \ 200 "#include <sys/param.h>\n" \ 201 "#include <sys/event.h>\n" \ 202 "#include <sys/kernel.h>\n" \ 203 "#include <sys/mount.h>\n" \ 204 "#include <sys/sdt.h>\n" \ 205 "#include <sys/signalvar.h>\n" \ 206 "#include <sys/systm.h>\n" \ 207 "#include <sys/vnode.h>\n" \ 208 "\n" \ 209 "SDT_PROVIDER_DECLARE(vfs);\n" \ 210 "\n" \ 211 "struct vnodeop_desc vop_default_desc = {\n" \ 212 " \"default\",\n" \ 213 " 0,\n" \ 214 " 0,\n" \ 215 " (vop_bypass_t *)vop_panic,\n" \ 216 " NULL,\n" \ 217 " VDESC_NO_OFFSET,\n" \ 218 " VDESC_NO_OFFSET,\n" \ 219 " VDESC_NO_OFFSET,\n" \ 220 " VDESC_NO_OFFSET,\n" \ 221 "};\n"); 222 } 223 224 while ((getline < srcfile) > 0) { 225 fnr++; 226 if (NF == 0) 227 continue; 228 if ($1 ~ /^%%/) { 229 if (NF != 6 || 230 $2 !~ /^[a-z_]+$/ || $3 !~ /^[a-z]+$/ || 231 $4 !~ /^.$/ || $5 !~ /^.$/ || $6 !~ /^.$/) { 232 die("Invalid %s construction", "%%"); 233 continue; 234 } 235 lockdata["vop_" $2, $3, "Entry"] = $4; 236 lockdata["vop_" $2, $3, "OK"] = $5; 237 lockdata["vop_" $2, $3, "Error"] = $6; 238 continue; 239 } 240 241 if ($1 ~ /^%!/) { 242 if (NF != 4 || 243 ($3 != "pre" && $3 != "post" && 244 $3 != "debugpre" && $3 != "debugpost")) { 245 die("Invalid %s construction", "%!"); 246 continue; 247 } 248 lockdata["vop_" $2, $3] = $4; 249 continue; 250 } 251 if ($1 ~ /^#/) 252 continue; 253 254 # Get the function name. 255 name = $1; 256 uname = toupper(name); 257 258 # Get the function arguments. 259 for (numargs = 0; ; ++numargs) { 260 if ((getline < srcfile) <= 0) { 261 die("Unable to read through the arguments for \"%s\"", 262 name); 263 } 264 fnr++; 265 if ($1 ~ /^\};/) 266 break; 267 268 # Delete comments, if any. 269 gsub (/\/\*.*\*\//, ""); 270 271 # Condense whitespace and delete leading/trailing space. 272 gsub(/[[:space:]]+/, " "); 273 sub(/^ /, ""); 274 sub(/ $/, ""); 275 276 # Pick off direction. 277 if ($1 != "INOUT" && $1 != "IN" && $1 != "OUT") 278 die("No IN/OUT direction for \"%s\".", $0); 279 dirs[numargs] = $1; 280 sub(/^[A-Z]* /, ""); 281 282 if ((reles[numargs] = $1) == "WILLRELE") 283 sub(/^[A-Z]* /, ""); 284 else 285 reles[numargs] = "WONTRELE"; 286 287 # kill trailing ; 288 if (sub(/;$/, "") < 1) 289 die("Missing end-of-line ; in \"%s\".", $0); 290 291 # pick off variable name 292 if ((argp = match($0, /[A-Za-z0-9_]+$/)) < 1) 293 die("Missing var name \"a_foo\" in \"%s\".", $0); 294 args[numargs] = substr($0, argp); 295 $0 = substr($0, 1, argp - 1); 296 297 # what is left must be type 298 # remove trailing space (if any) 299 sub(/ $/, ""); 300 types[numargs] = $0; 301 } 302 if (numargs > 4) 303 ctrargs = 4; 304 else 305 ctrargs = numargs; 306 ctrstr = ctrargs "(KTR_VOP, \"VOP\", \"" uname "\", (uintptr_t)a,\n\t "; 307 ctrstr = ctrstr "\"" args[0] ":0x%jX\", (uintptr_t)a->a_" args[0]; 308 for (i = 1; i < ctrargs; ++i) 309 ctrstr = ctrstr ", \"" args[i] ":0x%jX\", a->a_" args[i]; 310 ctrstr = ctrstr ");"; 311 312 if (pfile) { 313 printp("\t"name"_t\t*"name";") 314 } 315 if (qfile) { 316 printq("struct "name"_args;") 317 printq("typedef int "name"_t(struct "name"_args *);\n") 318 } 319 320 if (hfile) { 321 # Print out the vop_F_args structure. 322 printh("struct "name"_args {\n\tstruct vop_generic_args a_gen;"); 323 for (i = 0; i < numargs; ++i) 324 printh("\t" t_spc(types[i]) "a_" args[i] ";"); 325 printh("};"); 326 printh(""); 327 328 # Print out extern declaration. 329 printh("extern struct vnodeop_desc " name "_desc;"); 330 printh(""); 331 332 # Print out function prototypes. 333 printh("int " uname "_AP(struct " name "_args *);"); 334 printh("int " uname "_APV(struct vop_vector *vop, struct " name "_args *);"); 335 printh(""); 336 printh("static __inline int " uname "("); 337 for (i = 0; i < numargs; ++i) { 338 printh("\t" t_spc(types[i]) args[i] \ 339 (i < numargs - 1 ? "," : ")")); 340 } 341 printh("{"); 342 printh("\tstruct " name "_args a;"); 343 printh(""); 344 printh("\ta.a_gen.a_desc = &" name "_desc;"); 345 for (i = 0; i < numargs; ++i) 346 printh("\ta.a_" args[i] " = " args[i] ";"); 347 if (can_inline(name)) { 348 printh("\n#if !defined(DEBUG_VFS_LOCKS) && !defined(INVARIANTS) && !defined(KTR)"); 349 printh("\tif (!SDT_PROBES_ENABLED())"); 350 printh("\t\treturn (" args[0]"->v_op->"name"(&a));"); 351 printh("\telse"); 352 printh("\t\treturn (" uname "_APV("args[0]"->v_op, &a));"); 353 printh("#else"); 354 } 355 printh("\treturn (" uname "_APV("args[0]"->v_op, &a));"); 356 if (can_inline(name)) 357 printh("#endif"); 358 359 printh("}"); 360 361 printh(""); 362 } 363 364 if (cfile) { 365 funcarr[name] = 1; 366 # Print out the vop_F_vp_offsets structure. This all depends 367 # on naming conventions and nothing else. 368 printc("static int " name "_vp_offsets[] = {"); 369 # as a side effect, figure out the releflags 370 releflags = ""; 371 vpnum = 0; 372 for (i = 0; i < numargs; i++) { 373 if (types[i] == "struct vnode *") { 374 printc("\tVOPARG_OFFSETOF(struct " name \ 375 "_args,a_" args[i] "),"); 376 if (reles[i] == "WILLRELE") { 377 releflags = releflags \ 378 "|VDESC_VP" vpnum "_WILLRELE"; 379 } 380 vpnum++; 381 } 382 } 383 384 sub(/^\|/, "", releflags); 385 printc("\tVDESC_NO_OFFSET"); 386 printc("};"); 387 388 printc("\n"); 389 printc("SDT_PROBE_DEFINE2(vfs, vop, " name ", entry, \"struct vnode *\", \"struct " name "_args *\");\n"); 390 printc("SDT_PROBE_DEFINE3(vfs, vop, " name ", return, \"struct vnode *\", \"struct " name "_args *\", \"int\");\n"); 391 392 # Print out function. 393 printc("\nint\n" uname "_AP(struct " name "_args *a)"); 394 printc("{"); 395 printc(""); 396 printc("\treturn(" uname "_APV(a->a_" args[0] "->v_op, a));"); 397 printc("}"); 398 printc("\nint\n" uname "_APV(struct vop_vector *vop, struct " name "_args *a)"); 399 printc("{"); 400 printc("\tint rc;"); 401 printc(""); 402 printc("\tVNASSERT(a->a_gen.a_desc == &" name "_desc, a->a_" args[0]","); 403 printc("\t (\"Wrong a_desc in " name "(%p, %p)\", a->a_" args[0]", a));"); 404 printc("\tVNASSERT(vop != NULL, a->a_" args[0]", (\"No "name"(%p, %p)\", a->a_" args[0]", a));") 405 printc("\tKTR_START" ctrstr); 406 add_debugpre(name); 407 add_pre(name); 408 for (i = 0; i < numargs; ++i) 409 add_debug_code(name, args[i], "Entry", "\t"); 410 printc("\tif (!SDT_PROBES_ENABLED()) {"); 411 printc("\t\trc = vop->"name"(a);") 412 printc("\t} else {") 413 printc("\t\tSDT_PROBE2(vfs, vop, " name ", entry, a->a_" args[0] ", a);"); 414 printc("\t\trc = vop->"name"(a);") 415 printc("\t\tSDT_PROBE3(vfs, vop, " name ", return, a->a_" args[0] ", a, rc);"); 416 printc("\t}") 417 printc("\tif (rc == 0) {"); 418 for (i = 0; i < numargs; ++i) 419 add_debug_code(name, args[i], "OK", "\t\t"); 420 printc("\t} else {"); 421 for (i = 0; i < numargs; ++i) 422 add_debug_code(name, args[i], "Error", "\t\t"); 423 printc("\t}"); 424 add_post(name); 425 add_debugpost(name); 426 printc("\tKTR_STOP" ctrstr); 427 printc("\treturn (rc);"); 428 printc("}\n"); 429 430 # Print out the vnodeop_desc structure. 431 printc("struct vnodeop_desc " name "_desc = {"); 432 # printable name 433 printc("\t\"" name "\","); 434 # flags 435 vppwillrele = ""; 436 for (i = 0; i < numargs; i++) { 437 if (types[i] == "struct vnode **" && \ 438 reles[i] == "WILLRELE") { 439 vppwillrele = "|VDESC_VPP_WILLRELE"; 440 } 441 } 442 443 if (!releflags) 444 releflags = "0"; 445 printc("\t" releflags vppwillrele ","); 446 447 # index in struct vop_vector 448 printc("\t__offsetof(struct vop_vector, " name "),"); 449 # function to call 450 printc("\t(vop_bypass_t *)" uname "_AP,"); 451 # vp offsets 452 printc("\t" name "_vp_offsets,"); 453 # vpp (if any) 454 printc("\t" find_arg_with_type("struct vnode **") ","); 455 # cred (if any) 456 printc("\t" find_arg_with_type("struct ucred *") ","); 457 # thread (if any) 458 printc("\t" find_arg_with_type("struct thread *") ","); 459 # componentname 460 printc("\t" find_arg_with_type("struct componentname *") ","); 461 # transport layer information 462 printc("};\n"); 463 } 464 } 465 466 if (cfile) { 467 printc("void"); 468 printc("vfs_vector_op_register(struct vop_vector *orig_vop)"); 469 printc("{"); 470 printc("\tstruct vop_vector *vop;"); 471 printc(""); 472 printc("\tif (orig_vop->registered)"); 473 printc("\t\tpanic(\"%s: vop_vector %p already registered\",") 474 printc("\t\t __func__, orig_vop);"); 475 printc(""); 476 for (name in funcarr) { 477 printc("\tvop = orig_vop;"); 478 printc("\twhile (vop != NULL && \\"); 479 printc("\t vop->"name" == NULL && vop->vop_bypass == NULL)") 480 printc("\t\tvop = vop->vop_default;") 481 printc("\tif (vop != NULL)"); 482 printc("\t\torig_vop->"name" = vop->"name";"); 483 printc(""); 484 } 485 printc("\tvop = orig_vop;"); 486 printc("\twhile (vop != NULL && vop->vop_bypass == NULL)") 487 printc("\t\tvop = vop->vop_default;") 488 printc("\tif (vop != NULL)"); 489 printc("\t\torig_vop->vop_bypass = vop->vop_bypass;"); 490 printc(""); 491 for (name in funcarr) { 492 printc("\tif (orig_vop->"name" == NULL)"); 493 printc("\t\torig_vop->"name" = (void *)orig_vop->vop_bypass;"); 494 } 495 printc(""); 496 printc("\torig_vop->registered = true;"); 497 printc("}") 498 } 499 500 if (hfile) { 501 printh("void vfs_vector_op_register(struct vop_vector *orig_vop);"); 502 } 503 504 if (pfile) { 505 printp("\tbool\tregistered;") 506 printp("};") 507 } 508 509 if (hfile) 510 close(hfile); 511 if (cfile) 512 close(cfile); 513 if (pfile) 514 close(pfile); 515 close(srcfile); 516 517 exit 0; 518 519 }
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