sys/src/cmd/cwfs/main.c

   1 /* cached-worm file server */
   2 #include "all.h"
   3 #include "io.h"
   4 #include "9p1.h"
   5
   6 Map *devmap;
   7
   8 Biobuf bin;
   9 int chatty = 0;
  10 int sfd = -1;
  11
  12 void
  13 machinit(void)
  14 {
  15         active.exiting = 0;
  16 }
  17
  18 /*
  19  * Put a string on the console.
  20  */
  21 void
  22 puts(char *s, int n)
  23 {
  24         print("%.*s", n, s);
  25 }
  26
  27 void
  28 prflush(void)
  29 {
  30 }
  31
  32 /*
  33  * Print a string on the console.
  34  */
  35 void
  36 putstrn(char *str, int n)
  37 {
  38         puts(str, n);
  39 }
  40
  41 /*
  42  * get a character from the console
  43  */
  44 int
  45 getc(void)
  46 {
  47         return Bgetrune(&bin);
  48 }
  49
  50 void
  51 panic(char *fmt, ...)
  52 {
  53         int n;
  54         va_list arg;
  55         char buf[PRINTSIZE];
  56
  57         va_start(arg, fmt);
  58         n = vseprint(buf, buf + sizeof buf, fmt, arg) - buf;
  59         va_end(arg);
  60         buf[n] = '\0';
  61         fprint(2, "panic: %s\n", buf);
  62         exit();
  63 }
  64
  65 int
  66 okay(char *quest)
  67 {
  68         char *ln;
  69
  70         print("okay to %s? ", quest);
  71         if ((ln = Brdline(&bin, '\n')) == nil)
  72                 return 0;
  73         ln[Blinelen(&bin)-1] = '\0';
  74         if (isascii(*ln) && isupper(*ln))
  75                 *ln = tolower(*ln);
  76         return *ln == 'y';
  77 }
  78
  79 static void
  80 mapinit(char *mapfile)
  81 {
  82         int nf;
  83         char *ln;
  84         char *fields[2];
  85         Biobuf *bp;
  86         Map *map;
  87
  88         if (mapfile == nil)
  89                 return;
  90         bp = Bopen(mapfile, OREAD);
  91         if (bp == nil)
  92                 sysfatal("can't read %s", mapfile);
  93         devmap = nil;
  94         while((ln = Brdline(bp, '\n')) != nil) {
  95                 ln[Blinelen(bp)-1] = '\0';
  96                 if(*ln == '\0' || *ln == '#')
  97                         continue;
  98                 nf = tokenize(ln, fields, nelem(fields));
  99                 if(nf != 2)
 100                         continue;
 101                 if(testconfig(fields[0]) != 0) {
 102                         print("bad `from' device %s in %s\n",
 103                                 fields[0], mapfile);
 104                         continue;
 105                 }
 106                 map = malloc(sizeof *map);
 107                 map->from = strdup(fields[0]);
 108                 map->to =   strdup(fields[1]);
 109                 map->fdev = iconfig(fields[0]);
 110                 map->tdev = nil;
 111                 if(access(map->to, AEXIST) < 0) {
 112                         /*
 113                          * map->to isn't an existing file, so it had better be
 114                          * a config string for a device.
 115                          */
 116                         if(testconfig(fields[1]) == 0)
 117                                 map->tdev = iconfig(fields[1]);
 118                 }
 119                 /* else map->to is the replacement file name */
 120                 map->next = devmap;
 121                 devmap = map;
 122         }
 123         Bterm(bp);
 124 }
 125
 126 static void
 127 confinit(void)
 128 {
 129         conf.nmach = 1;
 130
 131         conf.nuid = 1000;
 132         conf.nserve = 15;               /* tunable */
 133         conf.nfile = 30000;
 134         conf.nlgmsg = 100;
 135         conf.nsmmsg = 500;
 136
 137         localconfinit();
 138
 139         conf.nwpath = conf.nfile*8;
 140         conf.gidspace = conf.nuid*3;
 141
 142         cons.flags = 0;
 143
 144         if (conf.devmap)
 145                 mapinit(conf.devmap);
 146 }
 147
 148 static int
 149 srvfd(char *s, int mode, int sfd)
 150 {
 151         int fd;
 152         char buf[32];
 153
 154         fd = create(s, ORCLOSE|OWRITE, mode);
 155         if(fd < 0){
 156                 remove(s);
 157                 fd = create(s, ORCLOSE|OWRITE, mode);
 158                 if(fd < 0)
 159                         panic(s);
 160         }
 161         sprint(buf, "%d", sfd);
 162         if(write(fd, buf, strlen(buf)) != strlen(buf))
 163                 panic("srv write");
 164         return sfd;
 165 }
 166
 167 static void
 168 postservice(void)
 169 {
 170         char buf[3*NAMELEN];
 171         int p[2];
 172
 173         if(service[0] == 0)
 174                 panic("no service name");
 175
 176         /* serve 9p for -s */
 177         if(sfd >= 0){
 178                 srvchan(sfd, "stdio");
 179                 sfd = -1;
 180         }
 181
 182         /* post 9p service */
 183         if(pipe(p) < 0)
 184                 panic("can't make a pipe");
 185         snprint(buf, sizeof(buf), "#s/%s", service);
 186         srvfd(buf, 0666, p[0]);
 187         close(p[0]);
 188         srvchan(p[1], buf);
 189
 190         /* post cmd service */
 191         if(pipe(p) < 0)
 192                 panic("can't make a pipe");
 193         snprint(buf, sizeof(buf), "#s/%s.cmd", service);
 194         srvfd(buf, 0220, p[0]);
 195         close(p[0]);
 196
 197         /* use it as stdin */
 198         dup(p[1], 0);
 199         close(p[1]);
 200 }
 201
 202 /*
 203  * compute BUFSIZE*(NDBLOCK+INDPERBUF+INDPERBUF⁲+INDPERBUF⁳+INDPERBUF⁴)
 204  * while watching for overflow; in that case, return 0.
 205  */
 206
 207 static uvlong
 208 adduvlongov(uvlong a, uvlong b)
 209 {
 210         uvlong r = a + b;
 211
 212         if (r < a || r < b)
 213                 return 0;
 214         return r;
 215 }
 216
 217 static uvlong
 218 muluvlongov(uvlong a, uvlong b)
 219 {
 220         uvlong r = a * b;
 221
 222         if (a != 0 && r/a != b || r < a || r < b)
 223                 return 0;
 224         return r;
 225 }
 226
 227 static uvlong
 228 maxsize(void)
 229 {
 230         int i;
 231         uvlong max = NDBLOCK, ind = 1;
 232
 233         for (i = 0; i < NIBLOCK; i++) {
 234                 ind = muluvlongov(ind, INDPERBUF);      /* power of INDPERBUF */
 235                 if (ind == 0)
 236                         return 0;
 237                 max = adduvlongov(max, ind);
 238                 if (max == 0)
 239                         return 0;
 240         }
 241         return muluvlongov(max, BUFSIZE);
 242 }
 243
 244 enum {
 245         INDPERBUF⁲ = ((uvlong)INDPERBUF *INDPERBUF),
 246         INDPERBUF⁴ = ((uvlong)INDPERBUF⁲*INDPERBUF⁲),
 247 };
 248
 249 static void
 250 printsizes(void)
 251 {
 252         uvlong max = maxsize();
 253
 254         print("\tblock size = %d; ", RBUFSIZE);
 255         if (max == 0)
 256                 print("max file size exceeds 2⁶⁴ bytes\n");
 257         else {
 258                 uvlong offlim = 1ULL << (sizeof(Off)*8 - 1);
 259
 260                 if (max >= offlim)
 261                         max = offlim - 1;
 262                 print("max file size = %,llud\n", (Wideoff)max);
 263         }
 264         if (INDPERBUF⁲/INDPERBUF != INDPERBUF)
 265                 print("overflow computing INDPERBUF⁲\n");
 266         if (INDPERBUF⁴/INDPERBUF⁲ != INDPERBUF⁲)
 267                 print("overflow computing INDPERBUF⁴\n");
 268         print("\tINDPERBUF = %d, INDPERBUF^4 = %,lld, ", INDPERBUF,
 269                 (Wideoff)INDPERBUF⁴);
 270         print("CEPERBK = %d\n", CEPERBK);
 271         print("\tsizeofs: Dentry = %d, Cache = %d\n",
 272                 sizeof(Dentry), sizeof(Cache));
 273 }
 274
 275 void
 276 usage(void)
 277 {
 278         fprint(2, "usage: %s [ -csC ] [-n service] [ -a ann-str ] [ -m dev-map ] [-f config-dev ]\n", argv0);
 279         exits("usage");
 280 }
 281
 282 void
 283 main(int argc, char **argv)
 284 {
 285         int i, nets = 0;
 286         char *ann;
 287
 288         rfork(RFNOTEG);
 289         formatinit();
 290         machinit();
 291         conf.confdev = "/dev/sdC0/fscache";
 292         conf.newcache = 0;
 293
 294         ARGBEGIN{
 295         case 'a':                       /* announce on this net */
 296                 ann = EARGF(usage());
 297                 if (nets >= Maxnets) {
 298                         fprint(2, "%s: too many networks to announce: %s\n",
 299                                 argv0, ann);
 300                         exits("too many nets");
 301                 }
 302                 annstrs[nets++] = ann;
 303                 break;
 304         case 'n':
 305                 strcpy(service, EARGF(usage()));
 306                 break;
 307         case 's':
 308                 dup(0, -1);
 309                 sfd = dup(1, -1);
 310                 close(0);
 311                 if(open("/dev/cons", OREAD) < 0)
 312                         open("#c/cons", OREAD);
 313                 close(1);
 314                 if(open("/dev/cons", OWRITE) < 0)
 315                         open("#c/cons", OWRITE);
 316                 break;
 317         case 'C':                       /* use new, faster cache layout */
 318                 conf.newcache = 1;
 319                 break;
 320         case 'c':
 321                 conf.configfirst++;
 322                 break;
 323         case 'f':                       /* device / partition / file  */
 324                 conf.confdev = EARGF(usage());
 325                 break;
 326         case 'm':                       /* name device-map file */
 327                 conf.devmap = EARGF(usage());
 328                 break;
 329         case 'd':
 330                 chatty++;
 331                 break;
 332         default:
 333                 usage();
 334                 break;
 335         }ARGEND
 336
 337         if(argc != 0)
 338                 usage();
 339
 340         Binit(&bin, 0, OREAD);
 341         confinit();
 342
 343         if(chatty){
 344                 print("\nPlan 9 %d-bit cached-worm file server with %d-deep indir blks\n",
 345                         sizeof(Off)*8 - 1, NIBLOCK);
 346                 printsizes();
 347         }
 348
 349         qlock(&reflock);
 350         qunlock(&reflock);
 351         serveq = newqueue(1000, "9P service");  /* tunable */
 352         raheadq = newqueue(1000, "readahead");  /* tunable */
 353
 354         mbinit();
 355         netinit();
 356         scsiinit();
 357
 358         files = malloc(conf.nfile * sizeof *files);
 359         for(i=0; i < conf.nfile; i++) {
 360                 qlock(&files[i]);
 361                 qunlock(&files[i]);
 362         }
 363
 364         wpaths = malloc(conf.nwpath * sizeof(*wpaths));
 365         uid = malloc(conf.nuid * sizeof(*uid));
 366         gidspace = malloc(conf.gidspace * sizeof(*gidspace));
 367
 368         iobufinit();
 369
 370         arginit();
 371         boottime = time(nil);
 372
 373         sysinit();
 374         srvinit();
 375
 376         /*
 377          * post filedescriptors to /srv
 378          */
 379         postservice();
 380
 381         /*
 382          * Ethernet i/o processes
 383          */
 384         netstart();
 385
 386         /*
 387          * read ahead processes
 388          */
 389         newproc(rahead, 0, "rah");
 390
 391         /*
 392          * server processes
 393          */
 394         for(i=0; i < conf.nserve; i++)
 395                 newproc(serve, 0, "srv");
 396
 397         /*
 398          * worm "dump" copy process
 399          */
 400         newproc(wormcopy, 0, "wcp");
 401
 402         /*
 403          * "sync" copy process
 404          */
 405         newproc(synccopy, 0, "scp");
 406
 407         /*
 408          * processes to read the console
 409          */
 410         consserve();
 411
 412         /* success */
 413         exits(nil);
 414 }
 415
 416 /*
 417  * read ahead processes.
 418  * read message from q and then
 419  * read the device.
 420  */
 421 int
 422 rbcmp(void *va, void *vb)
 423 {
 424         Rabuf *ra, *rb;
 425
 426         ra = *(Rabuf**)va;
 427         rb = *(Rabuf**)vb;
 428         if(rb == 0)
 429                 return 1;
 430         if(ra == 0)
 431                 return -1;
 432         if(ra->dev > rb->dev)
 433                 return 1;
 434         if(ra->dev < rb->dev)
 435                 return -1;
 436         if(ra->addr > rb->addr)
 437                 return 1;
 438         if(ra->addr < rb->addr)
 439                 return -1;
 440         return 0;
 441 }
 442
 443 void
 444 rahead(void *)
 445 {
 446         Rabuf *rb[50];
 447         Iobuf *p;
 448         int i, n;
 449
 450         for (;;) {
 451                 rb[0] = fs_recv(raheadq, 0);
 452                 for(n = 1; n < nelem(rb); n++) {
 453                         if(raheadq->count <= 0)
 454                                 break;
 455                         rb[n] = fs_recv(raheadq, 0);
 456                 }
 457                 qsort(rb, n, sizeof rb[0], rbcmp);
 458                 for(i = 0; i < n; i++) {
 459                         if(rb[i] == 0)
 460                                 continue;
 461                         p = getbuf(rb[i]->dev, rb[i]->addr, Brd);
 462                         if(p)
 463                                 putbuf(p);
 464                         lock(&rabuflock);
 465                         rb[i]->link = rabuffree;
 466                         rabuffree = rb[i];
 467                         unlock(&rabuflock);
 468                 }
 469         }
 470 }
 471
 472 /*
 473  * main filesystem server loop.
 474  * entered by many processes.
 475  * they wait for message buffers and
 476  * then process them.
 477  */
 478 void
 479 serve(void *)
 480 {
 481         int i;
 482         Chan *cp;
 483         Msgbuf *mb;
 484
 485         for (;;) {
 486                 qlock(&reflock);
 487                 /* read 9P request from a network input process */
 488                 mb = fs_recv(serveq, 0);
 489                 assert(mb->magic == Mbmagic);
 490                 /* fs kernel sets chan in /sys/src/fs/ip/il.c:/^getchan */
 491                 cp = mb->chan;
 492                 if (cp == nil)
 493                         panic("serve: nil mb->chan");
 494                 rlock(&cp->reflock);
 495                 qunlock(&reflock);
 496
 497                 rlock(&mainlock);
 498
 499                 if (mb->data == nil)
 500                         panic("serve: nil mb->data");
 501                 /* better sniffing code in /sys/src/cmd/disk/kfs/9p12.c */
 502                 if(cp->protocol == nil){
 503                         /* do we recognise the protocol in this packet? */
 504                         /* better sniffing code: /sys/src/cmd/disk/kfs/9p12.c */
 505                         for(i = 0; fsprotocol[i] != nil; i++)
 506                                 if(fsprotocol[i](mb) != 0) {
 507                                         cp->protocol = fsprotocol[i];
 508                                         break;
 509                                 }
 510                         if(cp->protocol == nil && (chatty > 1)){
 511                                 print("no protocol for message\n");
 512                                 hexdump(mb->data, 12);
 513                         }
 514                 } else
 515                         /* process the request, generate an answer and reply */
 516                         cp->protocol(mb);
 517
 518                 mbfree(mb);
 519                 runlock(&mainlock);
 520                 runlock(&cp->reflock);
 521         }
 522 }
 523
 524 void
 525 exit(void)
 526 {
 527         lock(&active);
 528         active.exiting = 1;
 529         unlock(&active);
 530
 531         print("halted at %T.\n", time(nil));
 532         postnote(PNGROUP, getpid(), "die");
 533         exits(nil);
 534 }
 535
 536 enum {
 537         DUMPTIME = 5,   /* 5 am */
 538         WEEKMASK = 0,   /* every day (1=sun, 2=mon, 4=tue, etc.) */
 539 };
 540
 541 /*
 542  * calculate the next dump time.
 543  * minimum delay is 100 minutes.
 544  */
 545 Timet
 546 nextdump(Timet t)
 547 {
 548         Timet nddate = nextime(t+MINUTE(100), DUMPTIME, WEEKMASK);
 549
 550         if(!conf.nodump && chatty)
 551                 print("next dump at %T\n", nddate);
 552         return nddate;
 553 }
 554
 555 /*
 556  * process to copy dump blocks from
 557  * cache to worm. it runs flat out when
 558  * it gets work, but only looks for
 559  * work every 10 seconds.
 560  */
 561 void
 562 wormcopy(void *)
 563 {
 564         int f, dorecalc = 1;
 565         Timet dt, t = 0, nddate = 0, ntoytime = 0;
 566         Filsys *fs;
 567
 568         for (;;) {
 569                 if (dorecalc) {
 570                         dorecalc = 0;
 571                         t = time(nil);
 572                         nddate = nextdump(t);           /* chatters */
 573                         ntoytime = time(nil);
 574                 }
 575                 dt = time(nil) - t;
 576                 if(dt < 0 || dt > MINUTE(100)) {
 577                         dorecalc = 1;
 578                         continue;
 579                 }
 580                 t += dt;
 581                 f = 0;
 582                 if(t > ntoytime)
 583                         ntoytime = time(nil) + HOUR(1);
 584                 else if(t > nddate) {
 585                         if(!conf.nodump) {
 586                                 print("automatic dump %T\n", t);
 587                                 for(fs=filsys; fs->name; fs++)
 588                                         if(fs->dev->type == Devcw)
 589                                                 cfsdump(fs);
 590                         }
 591                         dorecalc = 1;
 592                 } else {
 593                         rlock(&mainlock);
 594                         for(fs=filsys; fs->name; fs++)
 595                                 if(fs->dev->type == Devcw)
 596                                         f |= dumpblock(fs->dev);
 597                         runlock(&mainlock);
 598                         if(!f)
 599                                 delay(10000);
 600                         wormprobe();
 601                 }
 602         }
 603 }
 604
 605 /*
 606  * process to synch blocks
 607  * it puts out a block/cache-line every second
 608  * it waits 10 seconds if caught up.
 609  * in both cases, it takes about 10 seconds
 610  * to get up-to-date.
 611  */
 612 void
 613 synccopy(void *)
 614 {
 615         int f;
 616
 617         for (;;) {
 618                 rlock(&mainlock);
 619                 f = syncblock();
 620                 runlock(&mainlock);
 621                 if(!f)
 622                         delay(10000);
 623                 else
 624                         delay(1000);
 625         }
 626 }
 627
 628 Devsize
 629 inqsize(char *file)
 630 {
 631         int nf;
 632         char *ln, *end, *data = malloc(strlen(file) + 5 + 1);
 633         char *fields[4];
 634         Devsize rv = -1;
 635         Biobuf *bp;
 636
 637         strcpy(data, file);
 638         end = strstr(data, "/data");
 639         if (end == nil)
 640                 strcat(data, "/ctl");
 641         else
 642                 strcpy(end, "/ctl");
 643         bp = Bopen(data, OREAD);
 644         if (bp) {
 645                 while (rv < 0 && (ln = Brdline(bp, '\n')) != nil) {
 646                         ln[Blinelen(bp)-1] = '\0';
 647                         nf = tokenize(ln, fields, nelem(fields));
 648                         if (nf == 3 && strcmp(fields[0], "geometry") == 0)
 649                                 rv = atoi(fields[2]);
 650                 }
 651                 Bterm(bp);
 652         }
 653         free(data);
 654         return rv;
 655 }
 656