coda_psdev.c revision 1.57
1 /* $NetBSD: coda_psdev.c,v 1.57 2016/07/07 06:55:40 msaitoh Exp $ */ 2 3 /* 4 * 5 * Coda: an Experimental Distributed File System 6 * Release 3.1 7 * 8 * Copyright (c) 1987-1998 Carnegie Mellon University 9 * All Rights Reserved 10 * 11 * Permission to use, copy, modify and distribute this software and its 12 * documentation is hereby granted, provided that both the copyright 13 * notice and this permission notice appear in all copies of the 14 * software, derivative works or modified versions, and any portions 15 * thereof, and that both notices appear in supporting documentation, and 16 * that credit is given to Carnegie Mellon University in all documents 17 * and publicity pertaining to direct or indirect use of this code or its 18 * derivatives. 19 * 20 * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS, 21 * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS 22 * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON 23 * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER 24 * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF 25 * ANY DERIVATIVE WORK. 26 * 27 * Carnegie Mellon encourages users of this software to return any 28 * improvements or extensions that they make, and to grant Carnegie 29 * Mellon the rights to redistribute these changes without encumbrance. 30 * 31 * @(#) coda/coda_psdev.c,v 1.1.1.1 1998/08/29 21:26:45 rvb Exp $ 32 */ 33 34 /* 35 * Mach Operating System 36 * Copyright (c) 1989 Carnegie-Mellon University 37 * All rights reserved. The CMU software License Agreement specifies 38 * the terms and conditions for use and redistribution. 39 */ 40 41 /* 42 * This code was written for the Coda file system at Carnegie Mellon 43 * University. Contributers include David Steere, James Kistler, and 44 * M. Satyanarayanan. */ 45 46 /* These routines define the pseudo device for communication between 47 * Coda's Venus and Minicache in Mach 2.6. They used to be in cfs_subr.c, 48 * but I moved them to make it easier to port the Minicache without 49 * porting coda. -- DCS 10/12/94 50 * 51 * Following code depends on file-system CODA. 52 */ 53 54 /* These routines are the device entry points for Venus. */ 55 56 #include <sys/cdefs.h> 57 __KERNEL_RCSID(0, "$NetBSD: coda_psdev.c,v 1.57 2016/07/07 06:55:40 msaitoh Exp $"); 58 59 extern int coda_nc_initialized; /* Set if cache has been initialized */ 60 61 #include <sys/param.h> 62 #include <sys/systm.h> 63 #include <sys/kernel.h> 64 #include <sys/malloc.h> 65 #include <sys/proc.h> 66 #include <sys/mount.h> 67 #include <sys/file.h> 68 #include <sys/ioctl.h> 69 #include <sys/poll.h> 70 #include <sys/select.h> 71 #include <sys/conf.h> 72 #include <sys/atomic.h> 73 #include <sys/module.h> 74 75 #include <coda/coda.h> 76 #include <coda/cnode.h> 77 #include <coda/coda_namecache.h> 78 #include <coda/coda_io.h> 79 80 #include "ioconf.h" 81 82 #define CTL_C 83 84 int coda_psdev_print_entry = 0; 85 static 86 int outstanding_upcalls = 0; 87 int coda_call_sleep = PZERO - 1; 88 #ifdef CTL_C 89 int coda_pcatch = PCATCH; 90 #else 91 #endif 92 93 int coda_kernel_version = CODA_KERNEL_VERSION; 94 95 #define ENTRY if(coda_psdev_print_entry) myprintf(("Entered %s\n",__func__)) 96 97 dev_type_open(vc_nb_open); 98 dev_type_close(vc_nb_close); 99 dev_type_read(vc_nb_read); 100 dev_type_write(vc_nb_write); 101 dev_type_ioctl(vc_nb_ioctl); 102 dev_type_poll(vc_nb_poll); 103 dev_type_kqfilter(vc_nb_kqfilter); 104 105 const struct cdevsw vcoda_cdevsw = { 106 .d_open = vc_nb_open, 107 .d_close = vc_nb_close, 108 .d_read = vc_nb_read, 109 .d_write = vc_nb_write, 110 .d_ioctl = vc_nb_ioctl, 111 .d_stop = nostop, 112 .d_tty = notty, 113 .d_poll = vc_nb_poll, 114 .d_mmap = nommap, 115 .d_kqfilter = vc_nb_kqfilter, 116 .d_discard = nodiscard, 117 .d_flag = D_OTHER, 118 }; 119 120 struct vmsg { 121 TAILQ_ENTRY(vmsg) vm_chain; 122 void * vm_data; 123 u_short vm_flags; 124 u_short vm_inSize; /* Size is at most 5000 bytes */ 125 u_short vm_outSize; 126 u_short vm_opcode; /* copied from data to save ptr lookup */ 127 int vm_unique; 128 void * vm_sleep; /* Not used by Mach. */ 129 }; 130 131 struct coda_mntinfo coda_mnttbl[NVCODA]; 132 133 #define VM_READ 1 134 #define VM_WRITE 2 135 #define VM_INTR 4 136 137 /* vcodaattach: do nothing */ 138 void 139 vcodaattach(int n) 140 { 141 } 142 143 /* 144 * These functions are written for NetBSD. 145 */ 146 int 147 vc_nb_open(dev_t dev, int flag, int mode, 148 struct lwp *l) 149 { 150 struct vcomm *vcp; 151 152 ENTRY; 153 154 if (minor(dev) >= NVCODA) 155 return(ENXIO); 156 157 if (!coda_nc_initialized) 158 coda_nc_init(); 159 160 vcp = &coda_mnttbl[minor(dev)].mi_vcomm; 161 if (VC_OPEN(vcp)) 162 return(EBUSY); 163 164 selinit(&vcp->vc_selproc); 165 TAILQ_INIT(&vcp->vc_requests); 166 TAILQ_INIT(&vcp->vc_replies); 167 MARK_VC_OPEN(vcp); 168 169 coda_mnttbl[minor(dev)].mi_vfsp = NULL; 170 coda_mnttbl[minor(dev)].mi_rootvp = NULL; 171 172 return(0); 173 } 174 175 int 176 vc_nb_close(dev_t dev, int flag, int mode, struct lwp *l) 177 { 178 struct vcomm *vcp; 179 struct vmsg *vmp; 180 struct coda_mntinfo *mi; 181 int err; 182 183 ENTRY; 184 185 if (minor(dev) >= NVCODA) 186 return(ENXIO); 187 188 mi = &coda_mnttbl[minor(dev)]; 189 vcp = &(mi->mi_vcomm); 190 191 if (!VC_OPEN(vcp)) 192 panic("vcclose: not open"); 193 194 /* prevent future operations on this vfs from succeeding by auto- 195 * unmounting any vfs mounted via this device. This frees user or 196 * sysadm from having to remember where all mount points are located. 197 * Put this before WAKEUPs to avoid queuing new messages between 198 * the WAKEUP and the unmount (which can happen if we're unlucky) 199 */ 200 if (!mi->mi_rootvp) { 201 /* just a simple open/close w no mount */ 202 MARK_VC_CLOSED(vcp); 203 return 0; 204 } 205 206 /* Let unmount know this is for real */ 207 VTOC(mi->mi_rootvp)->c_flags |= C_UNMOUNTING; 208 coda_unmounting(mi->mi_vfsp); 209 210 /* Wakeup clients so they can return. */ 211 while ((vmp = TAILQ_FIRST(&vcp->vc_requests)) != NULL) { 212 TAILQ_REMOVE(&vcp->vc_requests, vmp, vm_chain); 213 214 /* Free signal request messages and don't wakeup cause 215 no one is waiting. */ 216 if (vmp->vm_opcode == CODA_SIGNAL) { 217 CODA_FREE(vmp->vm_data, VC_IN_NO_DATA); 218 CODA_FREE(vmp, sizeof(struct vmsg)); 219 continue; 220 } 221 outstanding_upcalls++; 222 wakeup(&vmp->vm_sleep); 223 } 224 225 while ((vmp = TAILQ_FIRST(&vcp->vc_replies)) != NULL) { 226 TAILQ_REMOVE(&vcp->vc_replies, vmp, vm_chain); 227 228 outstanding_upcalls++; 229 wakeup(&vmp->vm_sleep); 230 } 231 232 MARK_VC_CLOSED(vcp); 233 234 if (outstanding_upcalls) { 235 #ifdef CODA_VERBOSE 236 printf("presleep: outstanding_upcalls = %d\n", outstanding_upcalls); 237 (void) tsleep(&outstanding_upcalls, coda_call_sleep, "coda_umount", 0); 238 printf("postsleep: outstanding_upcalls = %d\n", outstanding_upcalls); 239 #else 240 (void) tsleep(&outstanding_upcalls, coda_call_sleep, "coda_umount", 0); 241 #endif 242 } 243 244 err = dounmount(mi->mi_vfsp, flag, l); 245 if (err) 246 myprintf(("Error %d unmounting vfs in vcclose(%llu)\n", 247 err, (unsigned long long)minor(dev))); 248 seldestroy(&vcp->vc_selproc); 249 return 0; 250 } 251 252 int 253 vc_nb_read(dev_t dev, struct uio *uiop, int flag) 254 { 255 struct vcomm * vcp; 256 struct vmsg *vmp; 257 int error = 0; 258 259 ENTRY; 260 261 if (minor(dev) >= NVCODA) 262 return(ENXIO); 263 264 vcp = &coda_mnttbl[minor(dev)].mi_vcomm; 265 266 /* Get message at head of request queue. */ 267 vmp = TAILQ_FIRST(&vcp->vc_requests); 268 if (vmp == NULL) 269 return(0); /* Nothing to read */ 270 271 /* Move the input args into userspace */ 272 uiop->uio_rw = UIO_READ; 273 error = uiomove(vmp->vm_data, vmp->vm_inSize, uiop); 274 if (error) { 275 myprintf(("vcread: error (%d) on uiomove\n", error)); 276 error = EINVAL; 277 } 278 279 TAILQ_REMOVE(&vcp->vc_requests, vmp, vm_chain); 280 281 /* If request was a signal, free up the message and don't 282 enqueue it in the reply queue. */ 283 if (vmp->vm_opcode == CODA_SIGNAL) { 284 if (codadebug) 285 myprintf(("vcread: signal msg (%d, %d)\n", 286 vmp->vm_opcode, vmp->vm_unique)); 287 CODA_FREE(vmp->vm_data, VC_IN_NO_DATA); 288 CODA_FREE(vmp, sizeof(struct vmsg)); 289 return(error); 290 } 291 292 vmp->vm_flags |= VM_READ; 293 TAILQ_INSERT_TAIL(&vcp->vc_replies, vmp, vm_chain); 294 295 return(error); 296 } 297 298 int 299 vc_nb_write(dev_t dev, struct uio *uiop, int flag) 300 { 301 struct vcomm * vcp; 302 struct vmsg *vmp; 303 struct coda_out_hdr *out; 304 u_long seq; 305 u_long opcode; 306 int tbuf[2]; 307 int error = 0; 308 309 ENTRY; 310 311 if (minor(dev) >= NVCODA) 312 return(ENXIO); 313 314 vcp = &coda_mnttbl[minor(dev)].mi_vcomm; 315 316 /* Peek at the opcode, unique without transfering the data. */ 317 uiop->uio_rw = UIO_WRITE; 318 error = uiomove(tbuf, sizeof(int) * 2, uiop); 319 if (error) { 320 myprintf(("vcwrite: error (%d) on uiomove\n", error)); 321 return(EINVAL); 322 } 323 324 opcode = tbuf[0]; 325 seq = tbuf[1]; 326 327 if (codadebug) 328 myprintf(("vcwrite got a call for %ld.%ld\n", opcode, seq)); 329 330 if (DOWNCALL(opcode)) { 331 union outputArgs pbuf; 332 333 /* get the rest of the data. */ 334 uiop->uio_rw = UIO_WRITE; 335 error = uiomove(&pbuf.coda_purgeuser.oh.result, sizeof(pbuf) - (sizeof(int)*2), uiop); 336 if (error) { 337 myprintf(("vcwrite: error (%d) on uiomove (Op %ld seq %ld)\n", 338 error, opcode, seq)); 339 return(EINVAL); 340 } 341 342 return handleDownCall(opcode, &pbuf); 343 } 344 345 /* Look for the message on the (waiting for) reply queue. */ 346 TAILQ_FOREACH(vmp, &vcp->vc_replies, vm_chain) { 347 if (vmp->vm_unique == seq) break; 348 } 349 350 if (vmp == NULL) { 351 if (codadebug) 352 myprintf(("vcwrite: msg (%ld, %ld) not found\n", opcode, seq)); 353 354 return(ESRCH); 355 } 356 357 /* Remove the message from the reply queue */ 358 TAILQ_REMOVE(&vcp->vc_replies, vmp, vm_chain); 359 360 /* move data into response buffer. */ 361 out = (struct coda_out_hdr *)vmp->vm_data; 362 /* Don't need to copy opcode and uniquifier. */ 363 364 /* get the rest of the data. */ 365 if (vmp->vm_outSize < uiop->uio_resid) { 366 myprintf(("vcwrite: more data than asked for (%d < %lu)\n", 367 vmp->vm_outSize, (unsigned long) uiop->uio_resid)); 368 wakeup(&vmp->vm_sleep); /* Notify caller of the error. */ 369 return(EINVAL); 370 } 371 372 tbuf[0] = uiop->uio_resid; /* Save this value. */ 373 uiop->uio_rw = UIO_WRITE; 374 error = uiomove(&out->result, vmp->vm_outSize - (sizeof(int) * 2), uiop); 375 if (error) { 376 myprintf(("vcwrite: error (%d) on uiomove (op %ld seq %ld)\n", 377 error, opcode, seq)); 378 return(EINVAL); 379 } 380 381 /* I don't think these are used, but just in case. */ 382 /* XXX - aren't these two already correct? -bnoble */ 383 out->opcode = opcode; 384 out->unique = seq; 385 vmp->vm_outSize = tbuf[0]; /* Amount of data transferred? */ 386 vmp->vm_flags |= VM_WRITE; 387 wakeup(&vmp->vm_sleep); 388 389 return(0); 390 } 391 392 int 393 vc_nb_ioctl(dev_t dev, u_long cmd, void *addr, int flag, 394 struct lwp *l) 395 { 396 ENTRY; 397 398 switch (cmd) { 399 case CODARESIZE: { 400 struct coda_resize *data = (struct coda_resize *)addr; 401 return(coda_nc_resize(data->hashsize, data->heapsize, IS_DOWNCALL)); 402 break; 403 } 404 case CODASTATS: 405 if (coda_nc_use) { 406 coda_nc_gather_stats(); 407 return(0); 408 } else { 409 return(ENODEV); 410 } 411 break; 412 case CODAPRINT: 413 if (coda_nc_use) { 414 print_coda_nc(); 415 return(0); 416 } else { 417 return(ENODEV); 418 } 419 break; 420 case CIOC_KERNEL_VERSION: 421 switch (*(u_int *)addr) { 422 case 0: 423 *(u_int *)addr = coda_kernel_version; 424 return 0; 425 break; 426 case 1: 427 case 2: 428 if (coda_kernel_version != *(u_int *)addr) 429 return ENOENT; 430 else 431 return 0; 432 default: 433 return ENOENT; 434 } 435 break; 436 default : 437 return(EINVAL); 438 break; 439 } 440 } 441 442 int 443 vc_nb_poll(dev_t dev, int events, struct lwp *l) 444 { 445 struct vcomm *vcp; 446 int event_msk = 0; 447 448 ENTRY; 449 450 if (minor(dev) >= NVCODA) 451 return(ENXIO); 452 453 vcp = &coda_mnttbl[minor(dev)].mi_vcomm; 454 455 event_msk = events & (POLLIN|POLLRDNORM); 456 if (!event_msk) 457 return(0); 458 459 if (!TAILQ_EMPTY(&vcp->vc_requests)) 460 return(events & (POLLIN|POLLRDNORM)); 461 462 selrecord(l, &(vcp->vc_selproc)); 463 464 return(0); 465 } 466 467 static void 468 filt_vc_nb_detach(struct knote *kn) 469 { 470 struct vcomm *vcp = kn->kn_hook; 471 472 SLIST_REMOVE(&vcp->vc_selproc.sel_klist, kn, knote, kn_selnext); 473 } 474 475 static int 476 filt_vc_nb_read(struct knote *kn, long hint) 477 { 478 struct vcomm *vcp = kn->kn_hook; 479 struct vmsg *vmp; 480 481 vmp = TAILQ_FIRST(&vcp->vc_requests); 482 if (vmp == NULL) 483 return (0); 484 485 kn->kn_data = vmp->vm_inSize; 486 return (1); 487 } 488 489 static const struct filterops vc_nb_read_filtops = 490 { 1, NULL, filt_vc_nb_detach, filt_vc_nb_read }; 491 492 int 493 vc_nb_kqfilter(dev_t dev, struct knote *kn) 494 { 495 struct vcomm *vcp; 496 struct klist *klist; 497 498 ENTRY; 499 500 if (minor(dev) >= NVCODA) 501 return(ENXIO); 502 503 vcp = &coda_mnttbl[minor(dev)].mi_vcomm; 504 505 switch (kn->kn_filter) { 506 case EVFILT_READ: 507 klist = &vcp->vc_selproc.sel_klist; 508 kn->kn_fop = &vc_nb_read_filtops; 509 break; 510 511 default: 512 return (EINVAL); 513 } 514 515 kn->kn_hook = vcp; 516 517 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 518 519 return (0); 520 } 521 522 /* 523 * Statistics 524 */ 525 struct coda_clstat coda_clstat; 526 527 /* 528 * Key question: whether to sleep interruptably or uninterruptably when 529 * waiting for Venus. The former seems better (cause you can ^C a 530 * job), but then GNU-EMACS completion breaks. Use tsleep with no 531 * timeout, and no longjmp happens. But, when sleeping 532 * "uninterruptibly", we don't get told if it returns abnormally 533 * (e.g. kill -9). 534 */ 535 536 int 537 coda_call(struct coda_mntinfo *mntinfo, int inSize, int *outSize, 538 void *buffer) 539 { 540 struct vcomm *vcp; 541 struct vmsg *vmp; 542 int error; 543 #ifdef CTL_C 544 struct lwp *l = curlwp; 545 struct proc *p = l->l_proc; 546 sigset_t psig_omask; 547 int i; 548 psig_omask = l->l_sigmask; /* XXXSA */ 549 #endif 550 if (mntinfo == NULL) { 551 /* Unlikely, but could be a race condition with a dying warden */ 552 return ENODEV; 553 } 554 555 vcp = &(mntinfo->mi_vcomm); 556 557 coda_clstat.ncalls++; 558 coda_clstat.reqs[((struct coda_in_hdr *)buffer)->opcode]++; 559 560 if (!VC_OPEN(vcp)) 561 return(ENODEV); 562 563 CODA_ALLOC(vmp,struct vmsg *,sizeof(struct vmsg)); 564 /* Format the request message. */ 565 vmp->vm_data = buffer; 566 vmp->vm_flags = 0; 567 vmp->vm_inSize = inSize; 568 vmp->vm_outSize 569 = *outSize ? *outSize : inSize; /* |buffer| >= inSize */ 570 vmp->vm_opcode = ((struct coda_in_hdr *)buffer)->opcode; 571 vmp->vm_unique = ++vcp->vc_seq; 572 if (codadebug) 573 myprintf(("Doing a call for %d.%d\n", 574 vmp->vm_opcode, vmp->vm_unique)); 575 576 /* Fill in the common input args. */ 577 ((struct coda_in_hdr *)buffer)->unique = vmp->vm_unique; 578 579 /* Append msg to request queue and poke Venus. */ 580 TAILQ_INSERT_TAIL(&vcp->vc_requests, vmp, vm_chain); 581 selnotify(&(vcp->vc_selproc), 0, 0); 582 583 /* We can be interrupted while we wait for Venus to process 584 * our request. If the interrupt occurs before Venus has read 585 * the request, we dequeue and return. If it occurs after the 586 * read but before the reply, we dequeue, send a signal 587 * message, and return. If it occurs after the reply we ignore 588 * it. In no case do we want to restart the syscall. If it 589 * was interrupted by a venus shutdown (vcclose), return 590 * ENODEV. */ 591 592 /* Ignore return, We have to check anyway */ 593 #ifdef CTL_C 594 /* This is work in progress. Setting coda_pcatch lets tsleep reawaken 595 on a ^c or ^z. The problem is that emacs sets certain interrupts 596 as SA_RESTART. This means that we should exit sleep handle the 597 "signal" and then go to sleep again. Mostly this is done by letting 598 the syscall complete and be restarted. We are not idempotent and 599 can not do this. A better solution is necessary. 600 */ 601 i = 0; 602 do { 603 error = tsleep(&vmp->vm_sleep, (coda_call_sleep|coda_pcatch), "coda_call", hz*2); 604 if (error == 0) 605 break; 606 mutex_enter(p->p_lock); 607 if (error == EWOULDBLOCK) { 608 #ifdef CODA_VERBOSE 609 printf("coda_call: tsleep TIMEOUT %d sec\n", 2+2*i); 610 #endif 611 } else if (sigispending(l, SIGIO)) { 612 sigaddset(&l->l_sigmask, SIGIO); 613 #ifdef CODA_VERBOSE 614 printf("coda_call: tsleep returns %d SIGIO, cnt %d\n", error, i); 615 #endif 616 } else if (sigispending(l, SIGALRM)) { 617 sigaddset(&l->l_sigmask, SIGALRM); 618 #ifdef CODA_VERBOSE 619 printf("coda_call: tsleep returns %d SIGALRM, cnt %d\n", error, i); 620 #endif 621 } else { 622 sigset_t tmp; 623 tmp = p->p_sigpend.sp_set; /* array assignment */ 624 sigminusset(&l->l_sigmask, &tmp); 625 626 #ifdef CODA_VERBOSE 627 printf("coda_call: tsleep returns %d, cnt %d\n", error, i); 628 printf("coda_call: siglist = %x.%x.%x.%x, sigmask = %x.%x.%x.%x, mask %x.%x.%x.%x\n", 629 p->p_sigpend.sp_set.__bits[0], p->p_sigpend.sp_set.__bits[1], 630 p->p_sigpend.sp_set.__bits[2], p->p_sigpend.sp_set.__bits[3], 631 l->l_sigmask.__bits[0], l->l_sigmask.__bits[1], 632 l->l_sigmask.__bits[2], l->l_sigmask.__bits[3], 633 tmp.__bits[0], tmp.__bits[1], tmp.__bits[2], tmp.__bits[3]); 634 #endif 635 mutex_exit(p->p_lock); 636 break; 637 #ifdef notyet 638 sigminusset(&l->l_sigmask, &p->p_sigpend.sp_set); 639 printf("coda_call: siglist = %x.%x.%x.%x, sigmask = %x.%x.%x.%x\n", 640 p->p_sigpend.sp_set.__bits[0], p->p_sigpend.sp_set.__bits[1], 641 p->p_sigpend.sp_set.__bits[2], p->p_sigpend.sp_set.__bits[3], 642 l->l_sigmask.__bits[0], l->l_sigmask.__bits[1], 643 l->l_sigmask.__bits[2], l->l_sigmask.__bits[3]); 644 #endif 645 } 646 mutex_exit(p->p_lock); 647 } while (error && i++ < 128 && VC_OPEN(vcp)); 648 l->l_sigmask = psig_omask; /* XXXSA */ 649 #else 650 (void) tsleep(&vmp->vm_sleep, coda_call_sleep, "coda_call", 0); 651 #endif 652 if (VC_OPEN(vcp)) { /* Venus is still alive */ 653 /* Op went through, interrupt or not... */ 654 if (vmp->vm_flags & VM_WRITE) { 655 error = 0; 656 *outSize = vmp->vm_outSize; 657 } 658 659 else if (!(vmp->vm_flags & VM_READ)) { 660 /* Interrupted before venus read it. */ 661 #ifdef CODA_VERBOSE 662 if (1) 663 #else 664 if (codadebug) 665 #endif 666 myprintf(("interrupted before read: op = %d.%d, flags = %x\n", 667 vmp->vm_opcode, vmp->vm_unique, vmp->vm_flags)); 668 669 TAILQ_REMOVE(&vcp->vc_requests, vmp, vm_chain); 670 error = EINTR; 671 } 672 673 else { 674 /* (!(vmp->vm_flags & VM_WRITE)) means interrupted after 675 upcall started */ 676 /* Interrupted after start of upcall, send venus a signal */ 677 struct coda_in_hdr *dog; 678 struct vmsg *svmp; 679 680 #ifdef CODA_VERBOSE 681 if (1) 682 #else 683 if (codadebug) 684 #endif 685 myprintf(("Sending Venus a signal: op = %d.%d, flags = %x\n", 686 vmp->vm_opcode, vmp->vm_unique, vmp->vm_flags)); 687 688 TAILQ_REMOVE(&vcp->vc_replies, vmp, vm_chain); 689 error = EINTR; 690 691 CODA_ALLOC(svmp, struct vmsg *, sizeof (struct vmsg)); 692 693 CODA_ALLOC((svmp->vm_data), char *, sizeof (struct coda_in_hdr)); 694 dog = (struct coda_in_hdr *)svmp->vm_data; 695 696 svmp->vm_flags = 0; 697 dog->opcode = svmp->vm_opcode = CODA_SIGNAL; 698 dog->unique = svmp->vm_unique = vmp->vm_unique; 699 svmp->vm_inSize = sizeof (struct coda_in_hdr); 700 /*??? rvb */ svmp->vm_outSize = sizeof (struct coda_in_hdr); 701 702 if (codadebug) 703 myprintf(("coda_call: enqueing signal msg (%d, %d)\n", 704 svmp->vm_opcode, svmp->vm_unique)); 705 706 /* insert at head of queue */ 707 TAILQ_INSERT_HEAD(&vcp->vc_requests, svmp, vm_chain); 708 selnotify(&(vcp->vc_selproc), 0, 0); 709 } 710 } 711 712 else { /* If venus died (!VC_OPEN(vcp)) */ 713 if (codadebug) 714 myprintf(("vcclose woke op %d.%d flags %d\n", 715 vmp->vm_opcode, vmp->vm_unique, vmp->vm_flags)); 716 717 error = ENODEV; 718 } 719 720 CODA_FREE(vmp, sizeof(struct vmsg)); 721 722 if (outstanding_upcalls > 0 && (--outstanding_upcalls == 0)) 723 wakeup(&outstanding_upcalls); 724 725 if (!error) 726 error = ((struct coda_out_hdr *)buffer)->result; 727 return(error); 728 } 729 730 MODULE(MODULE_CLASS_DRIVER, vcoda, NULL); 731 732 static int 733 vcoda_modcmd(modcmd_t cmd, void *arg) 734 { 735 int error = 0; 736 737 switch (cmd) { 738 case MODULE_CMD_INIT: 739 #ifdef _MODULE 740 { 741 int cmajor, dmajor; 742 vcodaattach(NVCODA); 743 744 dmajor = cmajor = -1; 745 return devsw_attach("vcoda", NULL, &dmajor, 746 &vcoda_cdevsw, &cmajor); 747 } 748 #endif 749 break; 750 751 case MODULE_CMD_FINI: 752 #ifdef _MODULE 753 { 754 for (size_t i = 0; i < NVCODA; i++) { 755 struct vcomm *vcp = &coda_mnttbl[i].mi_vcomm; 756 if (VC_OPEN(vcp)) 757 return EBUSY; 758 } 759 return devsw_detach(NULL, &vcoda_cdevsw); 760 } 761 #endif 762 break; 763 764 case MODULE_CMD_STAT: 765 return ENOTTY; 766 767 default: 768 return ENOTTY; 769 } 770 return error; 771 } 772
Indexes created Tue Sep 23 22:09:46 GMT 2025