coda_psdev.c revision 1.47.18.1
1 /* $NetBSD: coda_psdev.c,v 1.47.18.1 2012/04/29 23:04:44 mrg 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 1.47.18.1 2012/04/29 23:04:44 mrg Exp $"); 58 59 extern int coda_nc_initialized; /* Set if cache has been initialized */ 60 61 #ifndef _KERNEL_OPT 62 #define NVCODA 4 63 #else 64 #include <vcoda.h> 65 #endif 66 67 #include <sys/param.h> 68 #include <sys/systm.h> 69 #include <sys/kernel.h> 70 #include <sys/malloc.h> 71 #include <sys/proc.h> 72 #include <sys/mount.h> 73 #include <sys/file.h> 74 #include <sys/ioctl.h> 75 #include <sys/poll.h> 76 #include <sys/select.h> 77 #include <sys/conf.h> 78 #include <sys/atomic.h> 79 #include <sys/module.h> 80 81 #include <miscfs/syncfs/syncfs.h> 82 83 #include <coda/coda.h> 84 #include <coda/cnode.h> 85 #include <coda/coda_namecache.h> 86 #include <coda/coda_io.h> 87 88 #define CTL_C 89 90 int coda_psdev_print_entry = 0; 91 static 92 int outstanding_upcalls = 0; 93 int coda_call_sleep = PZERO - 1; 94 #ifdef CTL_C 95 int coda_pcatch = PCATCH; 96 #else 97 #endif 98 99 int coda_kernel_version = CODA_KERNEL_VERSION; 100 101 #define ENTRY if(coda_psdev_print_entry) myprintf(("Entered %s\n",__func__)) 102 103 void vcodaattach(int n); 104 105 dev_type_open(vc_nb_open); 106 dev_type_close(vc_nb_close); 107 dev_type_read(vc_nb_read); 108 dev_type_write(vc_nb_write); 109 dev_type_ioctl(vc_nb_ioctl); 110 dev_type_poll(vc_nb_poll); 111 dev_type_kqfilter(vc_nb_kqfilter); 112 113 const struct cdevsw vcoda_cdevsw = { 114 vc_nb_open, vc_nb_close, vc_nb_read, vc_nb_write, vc_nb_ioctl, 115 nostop, notty, vc_nb_poll, nommap, vc_nb_kqfilter, D_OTHER, 116 }; 117 118 struct vmsg { 119 TAILQ_ENTRY(vmsg) vm_chain; 120 void * vm_data; 121 u_short vm_flags; 122 u_short vm_inSize; /* Size is at most 5000 bytes */ 123 u_short vm_outSize; 124 u_short vm_opcode; /* copied from data to save ptr lookup */ 125 int vm_unique; 126 void * vm_sleep; /* Not used by Mach. */ 127 }; 128 129 struct coda_mntinfo coda_mnttbl[NVCODA]; 130 131 #define VM_READ 1 132 #define VM_WRITE 2 133 #define VM_INTR 4 134 135 /* vcodaattach: do nothing */ 136 void 137 vcodaattach(int n) 138 { 139 } 140 141 /* 142 * These functions are written for NetBSD. 143 */ 144 int 145 vc_nb_open(dev_t dev, int flag, int mode, 146 struct lwp *l) 147 { 148 struct vcomm *vcp; 149 150 ENTRY; 151 152 if (minor(dev) >= NVCODA) 153 return(ENXIO); 154 155 if (!coda_nc_initialized) 156 coda_nc_init(); 157 158 vcp = &coda_mnttbl[minor(dev)].mi_vcomm; 159 if (VC_OPEN(vcp)) 160 return(EBUSY); 161 162 selinit(&vcp->vc_selproc); 163 TAILQ_INIT(&vcp->vc_requests); 164 TAILQ_INIT(&vcp->vc_replies); 165 MARK_VC_OPEN(vcp); 166 167 coda_mnttbl[minor(dev)].mi_vfsp = NULL; 168 coda_mnttbl[minor(dev)].mi_rootvp = NULL; 169 170 return(0); 171 } 172 173 int 174 vc_nb_close(dev_t dev, int flag, int mode, struct lwp *l) 175 { 176 struct vcomm *vcp; 177 struct vmsg *vmp; 178 struct coda_mntinfo *mi; 179 int err; 180 181 ENTRY; 182 183 if (minor(dev) >= NVCODA) 184 return(ENXIO); 185 186 mi = &coda_mnttbl[minor(dev)]; 187 vcp = &(mi->mi_vcomm); 188 189 if (!VC_OPEN(vcp)) 190 panic("vcclose: not open"); 191 192 /* prevent future operations on this vfs from succeeding by auto- 193 * unmounting any vfs mounted via this device. This frees user or 194 * sysadm from having to remember where all mount points are located. 195 * Put this before WAKEUPs to avoid queuing new messages between 196 * the WAKEUP and the unmount (which can happen if we're unlucky) 197 */ 198 if (!mi->mi_rootvp) { 199 /* just a simple open/close w no mount */ 200 MARK_VC_CLOSED(vcp); 201 return 0; 202 } 203 204 /* Let unmount know this is for real */ 205 atomic_inc_uint(&mi->mi_vfsp->mnt_refcnt); 206 VTOC(mi->mi_rootvp)->c_flags |= C_UNMOUNTING; 207 coda_unmounting(mi->mi_vfsp); 208 209 /* Wakeup clients so they can return. */ 210 while ((vmp = TAILQ_FIRST(&vcp->vc_requests)) != NULL) { 211 TAILQ_REMOVE(&vcp->vc_requests, vmp, vm_chain); 212 213 /* Free signal request messages and don't wakeup cause 214 no one is waiting. */ 215 if (vmp->vm_opcode == CODA_SIGNAL) { 216 CODA_FREE(vmp->vm_data, VC_IN_NO_DATA); 217 CODA_FREE(vmp, sizeof(struct vmsg)); 218 continue; 219 } 220 outstanding_upcalls++; 221 wakeup(&vmp->vm_sleep); 222 } 223 224 while ((vmp = TAILQ_FIRST(&vcp->vc_replies)) != NULL) { 225 TAILQ_REMOVE(&vcp->vc_replies, vmp, vm_chain); 226 227 outstanding_upcalls++; 228 wakeup(&vmp->vm_sleep); 229 } 230 231 MARK_VC_CLOSED(vcp); 232 233 if (outstanding_upcalls) { 234 #ifdef CODA_VERBOSE 235 printf("presleep: outstanding_upcalls = %d\n", outstanding_upcalls); 236 (void) tsleep(&outstanding_upcalls, coda_call_sleep, "coda_umount", 0); 237 printf("postsleep: outstanding_upcalls = %d\n", outstanding_upcalls); 238 #else 239 (void) tsleep(&outstanding_upcalls, coda_call_sleep, "coda_umount", 0); 240 #endif 241 } 242 243 err = dounmount(mi->mi_vfsp, flag, l); 244 if (err) 245 myprintf(("Error %d unmounting vfs in vcclose(%llu)\n", 246 err, (unsigned long long)minor(dev))); 247 seldestroy(&vcp->vc_selproc); 248 return 0; 249 } 250 251 int 252 vc_nb_read(dev_t dev, struct uio *uiop, int flag) 253 { 254 struct vcomm * vcp; 255 struct vmsg *vmp; 256 int error = 0; 257 258 ENTRY; 259 260 if (minor(dev) >= NVCODA) 261 return(ENXIO); 262 263 vcp = &coda_mnttbl[minor(dev)].mi_vcomm; 264 265 /* Get message at head of request queue. */ 266 vmp = TAILQ_FIRST(&vcp->vc_requests); 267 if (vmp == NULL) 268 return(0); /* Nothing to read */ 269 270 /* Move the input args into userspace */ 271 uiop->uio_rw = UIO_READ; 272 error = uiomove(vmp->vm_data, vmp->vm_inSize, uiop); 273 if (error) { 274 myprintf(("vcread: error (%d) on uiomove\n", error)); 275 error = EINVAL; 276 } 277 278 TAILQ_REMOVE(&vcp->vc_requests, vmp, vm_chain); 279 280 /* If request was a signal, free up the message and don't 281 enqueue it in the reply queue. */ 282 if (vmp->vm_opcode == CODA_SIGNAL) { 283 if (codadebug) 284 myprintf(("vcread: signal msg (%d, %d)\n", 285 vmp->vm_opcode, vmp->vm_unique)); 286 CODA_FREE(vmp->vm_data, VC_IN_NO_DATA); 287 CODA_FREE(vmp, sizeof(struct vmsg)); 288 return(error); 289 } 290 291 vmp->vm_flags |= VM_READ; 292 TAILQ_INSERT_TAIL(&vcp->vc_replies, vmp, vm_chain); 293 294 return(error); 295 } 296 297 int 298 vc_nb_write(dev_t dev, struct uio *uiop, int flag) 299 { 300 struct vcomm * vcp; 301 struct vmsg *vmp; 302 struct coda_out_hdr *out; 303 u_long seq; 304 u_long opcode; 305 int tbuf[2]; 306 int error = 0; 307 308 ENTRY; 309 310 if (minor(dev) >= NVCODA) 311 return(ENXIO); 312 313 vcp = &coda_mnttbl[minor(dev)].mi_vcomm; 314 315 /* Peek at the opcode, unique without transfering the data. */ 316 uiop->uio_rw = UIO_WRITE; 317 error = uiomove(tbuf, sizeof(int) * 2, uiop); 318 if (error) { 319 myprintf(("vcwrite: error (%d) on uiomove\n", error)); 320 return(EINVAL); 321 } 322 323 opcode = tbuf[0]; 324 seq = tbuf[1]; 325 326 if (codadebug) 327 myprintf(("vcwrite got a call for %ld.%ld\n", opcode, seq)); 328 329 if (DOWNCALL(opcode)) { 330 union outputArgs pbuf; 331 332 /* get the rest of the data. */ 333 uiop->uio_rw = UIO_WRITE; 334 error = uiomove(&pbuf.coda_purgeuser.oh.result, sizeof(pbuf) - (sizeof(int)*2), uiop); 335 if (error) { 336 myprintf(("vcwrite: error (%d) on uiomove (Op %ld seq %ld)\n", 337 error, opcode, seq)); 338 return(EINVAL); 339 } 340 341 return handleDownCall(opcode, &pbuf); 342 } 343 344 /* Look for the message on the (waiting for) reply queue. */ 345 TAILQ_FOREACH(vmp, &vcp->vc_replies, vm_chain) { 346 if (vmp->vm_unique == seq) break; 347 } 348 349 if (vmp == NULL) { 350 if (codadebug) 351 myprintf(("vcwrite: msg (%ld, %ld) not found\n", opcode, seq)); 352 353 return(ESRCH); 354 } 355 356 /* Remove the message from the reply queue */ 357 TAILQ_REMOVE(&vcp->vc_replies, vmp, vm_chain); 358 359 /* move data into response buffer. */ 360 out = (struct coda_out_hdr *)vmp->vm_data; 361 /* Don't need to copy opcode and uniquifier. */ 362 363 /* get the rest of the data. */ 364 if (vmp->vm_outSize < uiop->uio_resid) { 365 myprintf(("vcwrite: more data than asked for (%d < %lu)\n", 366 vmp->vm_outSize, (unsigned long) uiop->uio_resid)); 367 wakeup(&vmp->vm_sleep); /* Notify caller of the error. */ 368 return(EINVAL); 369 } 370 371 tbuf[0] = uiop->uio_resid; /* Save this value. */ 372 uiop->uio_rw = UIO_WRITE; 373 error = uiomove(&out->result, vmp->vm_outSize - (sizeof(int) * 2), uiop); 374 if (error) { 375 myprintf(("vcwrite: error (%d) on uiomove (op %ld seq %ld)\n", 376 error, opcode, seq)); 377 return(EINVAL); 378 } 379 380 /* I don't think these are used, but just in case. */ 381 /* XXX - aren't these two already correct? -bnoble */ 382 out->opcode = opcode; 383 out->unique = seq; 384 vmp->vm_outSize = tbuf[0]; /* Amount of data transferred? */ 385 vmp->vm_flags |= VM_WRITE; 386 wakeup(&vmp->vm_sleep); 387 388 return(0); 389 } 390 391 int 392 vc_nb_ioctl(dev_t dev, u_long cmd, void *addr, int flag, 393 struct lwp *l) 394 { 395 ENTRY; 396 397 switch(cmd) { 398 case CODARESIZE: { 399 struct coda_resize *data = (struct coda_resize *)addr; 400 return(coda_nc_resize(data->hashsize, data->heapsize, IS_DOWNCALL)); 401 break; 402 } 403 case CODASTATS: 404 if (coda_nc_use) { 405 coda_nc_gather_stats(); 406 return(0); 407 } else { 408 return(ENODEV); 409 } 410 break; 411 case CODAPRINT: 412 if (coda_nc_use) { 413 print_coda_nc(); 414 return(0); 415 } else { 416 return(ENODEV); 417 } 418 break; 419 case CIOC_KERNEL_VERSION: 420 switch (*(u_int *)addr) { 421 case 0: 422 *(u_int *)addr = coda_kernel_version; 423 return 0; 424 break; 425 case 1: 426 case 2: 427 if (coda_kernel_version != *(u_int *)addr) 428 return ENOENT; 429 else 430 return 0; 431 default: 432 return ENOENT; 433 } 434 break; 435 default : 436 return(EINVAL); 437 break; 438 } 439 } 440 441 int 442 vc_nb_poll(dev_t dev, int events, struct lwp *l) 443 { 444 struct vcomm *vcp; 445 int event_msk = 0; 446 447 ENTRY; 448 449 if (minor(dev) >= NVCODA) 450 return(ENXIO); 451 452 vcp = &coda_mnttbl[minor(dev)].mi_vcomm; 453 454 event_msk = events & (POLLIN|POLLRDNORM); 455 if (!event_msk) 456 return(0); 457 458 if (!TAILQ_EMPTY(&vcp->vc_requests)) 459 return(events & (POLLIN|POLLRDNORM)); 460 461 selrecord(l, &(vcp->vc_selproc)); 462 463 return(0); 464 } 465 466 static void 467 filt_vc_nb_detach(struct knote *kn) 468 { 469 struct vcomm *vcp = kn->kn_hook; 470 471 SLIST_REMOVE(&vcp->vc_selproc.sel_klist, kn, knote, kn_selnext); 472 } 473 474 static int 475 filt_vc_nb_read(struct knote *kn, long hint) 476 { 477 struct vcomm *vcp = kn->kn_hook; 478 struct vmsg *vmp; 479 480 vmp = TAILQ_FIRST(&vcp->vc_requests); 481 if (vmp == NULL) 482 return (0); 483 484 kn->kn_data = vmp->vm_inSize; 485 return (1); 486 } 487 488 static const struct filterops vc_nb_read_filtops = 489 { 1, NULL, filt_vc_nb_detach, filt_vc_nb_read }; 490 491 int 492 vc_nb_kqfilter(dev_t dev, struct knote *kn) 493 { 494 struct vcomm *vcp; 495 struct klist *klist; 496 497 ENTRY; 498 499 if (minor(dev) >= NVCODA) 500 return(ENXIO); 501 502 vcp = &coda_mnttbl[minor(dev)].mi_vcomm; 503 504 switch (kn->kn_filter) { 505 case EVFILT_READ: 506 klist = &vcp->vc_selproc.sel_klist; 507 kn->kn_fop = &vc_nb_read_filtops; 508 break; 509 510 default: 511 return (EINVAL); 512 } 513 514 kn->kn_hook = vcp; 515 516 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 517 518 return (0); 519 } 520 521 /* 522 * Statistics 523 */ 524 struct coda_clstat coda_clstat; 525 526 /* 527 * Key question: whether to sleep interruptably or uninterruptably when 528 * waiting for Venus. The former seems better (cause you can ^C a 529 * job), but then GNU-EMACS completion breaks. Use tsleep with no 530 * timeout, and no longjmp happens. But, when sleeping 531 * "uninterruptibly", we don't get told if it returns abnormally 532 * (e.g. kill -9). 533 */ 534 535 int 536 coda_call(struct coda_mntinfo *mntinfo, int inSize, int *outSize, 537 void *buffer) 538 { 539 struct vcomm *vcp; 540 struct vmsg *vmp; 541 int error; 542 #ifdef CTL_C 543 struct lwp *l = curlwp; 544 struct proc *p = l->l_proc; 545 sigset_t psig_omask; 546 int i; 547 psig_omask = l->l_sigmask; /* XXXSA */ 548 #endif 549 if (mntinfo == NULL) { 550 /* Unlikely, but could be a race condition with a dying warden */ 551 return ENODEV; 552 } 553 554 vcp = &(mntinfo->mi_vcomm); 555 556 coda_clstat.ncalls++; 557 coda_clstat.reqs[((struct coda_in_hdr *)buffer)->opcode]++; 558 559 if (!VC_OPEN(vcp)) 560 return(ENODEV); 561 562 CODA_ALLOC(vmp,struct vmsg *,sizeof(struct vmsg)); 563 /* Format the request message. */ 564 vmp->vm_data = buffer; 565 vmp->vm_flags = 0; 566 vmp->vm_inSize = inSize; 567 vmp->vm_outSize 568 = *outSize ? *outSize : inSize; /* |buffer| >= inSize */ 569 vmp->vm_opcode = ((struct coda_in_hdr *)buffer)->opcode; 570 vmp->vm_unique = ++vcp->vc_seq; 571 if (codadebug) 572 myprintf(("Doing a call for %d.%d\n", 573 vmp->vm_opcode, vmp->vm_unique)); 574 575 /* Fill in the common input args. */ 576 ((struct coda_in_hdr *)buffer)->unique = vmp->vm_unique; 577 578 /* Append msg to request queue and poke Venus. */ 579 TAILQ_INSERT_TAIL(&vcp->vc_requests, vmp, vm_chain); 580 selnotify(&(vcp->vc_selproc), 0, 0); 581 582 /* We can be interrupted while we wait for Venus to process 583 * our request. If the interrupt occurs before Venus has read 584 * the request, we dequeue and return. If it occurs after the 585 * read but before the reply, we dequeue, send a signal 586 * message, and return. If it occurs after the reply we ignore 587 * it. In no case do we want to restart the syscall. If it 588 * was interrupted by a venus shutdown (vcclose), return 589 * ENODEV. */ 590 591 /* Ignore return, We have to check anyway */ 592 #ifdef CTL_C 593 /* This is work in progress. Setting coda_pcatch lets tsleep reawaken 594 on a ^c or ^z. The problem is that emacs sets certain interrupts 595 as SA_RESTART. This means that we should exit sleep handle the 596 "signal" and then go to sleep again. Mostly this is done by letting 597 the syscall complete and be restarted. We are not idempotent and 598 can not do this. A better solution is necessary. 599 */ 600 i = 0; 601 do { 602 error = tsleep(&vmp->vm_sleep, (coda_call_sleep|coda_pcatch), "coda_call", hz*2); 603 if (error == 0) 604 break; 605 mutex_enter(p->p_lock); 606 if (error == EWOULDBLOCK) { 607 #ifdef CODA_VERBOSE 608 printf("coda_call: tsleep TIMEOUT %d sec\n", 2+2*i); 609 #endif 610 } else if (sigispending(l, SIGIO)) { 611 sigaddset(&l->l_sigmask, SIGIO); 612 #ifdef CODA_VERBOSE 613 printf("coda_call: tsleep returns %d SIGIO, cnt %d\n", error, i); 614 #endif 615 } else if (sigispending(l, SIGALRM)) { 616 sigaddset(&l->l_sigmask, SIGALRM); 617 #ifdef CODA_VERBOSE 618 printf("coda_call: tsleep returns %d SIGALRM, cnt %d\n", error, i); 619 #endif 620 } else { 621 sigset_t tmp; 622 tmp = p->p_sigpend.sp_set; /* array assignment */ 623 sigminusset(&l->l_sigmask, &tmp); 624 625 #ifdef CODA_VERBOSE 626 printf("coda_call: tsleep returns %d, cnt %d\n", error, i); 627 printf("coda_call: siglist = %x.%x.%x.%x, sigmask = %x.%x.%x.%x, mask %x.%x.%x.%x\n", 628 p->p_sigpend.sp_set.__bits[0], p->p_sigpend.sp_set.__bits[1], 629 p->p_sigpend.sp_set.__bits[2], p->p_sigpend.sp_set.__bits[3], 630 l->l_sigmask.__bits[0], l->l_sigmask.__bits[1], 631 l->l_sigmask.__bits[2], l->l_sigmask.__bits[3], 632 tmp.__bits[0], tmp.__bits[1], tmp.__bits[2], tmp.__bits[3]); 633 #endif 634 mutex_exit(p->p_lock); 635 break; 636 #ifdef notyet 637 sigminusset(&l->l_sigmask, &p->p_sigpend.sp_set); 638 printf("coda_call: siglist = %x.%x.%x.%x, sigmask = %x.%x.%x.%x\n", 639 p->p_sigpend.sp_set.__bits[0], p->p_sigpend.sp_set.__bits[1], 640 p->p_sigpend.sp_set.__bits[2], p->p_sigpend.sp_set.__bits[3], 641 l->l_sigmask.__bits[0], l->l_sigmask.__bits[1], 642 l->l_sigmask.__bits[2], l->l_sigmask.__bits[3]); 643 #endif 644 } 645 mutex_exit(p->p_lock); 646 } while (error && i++ < 128 && VC_OPEN(vcp)); 647 l->l_sigmask = psig_omask; /* XXXSA */ 648 #else 649 (void) tsleep(&vmp->vm_sleep, coda_call_sleep, "coda_call", 0); 650 #endif 651 if (VC_OPEN(vcp)) { /* Venus is still alive */ 652 /* Op went through, interrupt or not... */ 653 if (vmp->vm_flags & VM_WRITE) { 654 error = 0; 655 *outSize = vmp->vm_outSize; 656 } 657 658 else if (!(vmp->vm_flags & VM_READ)) { 659 /* Interrupted before venus read it. */ 660 #ifdef CODA_VERBOSE 661 if (1) 662 #else 663 if (codadebug) 664 #endif 665 myprintf(("interrupted before read: op = %d.%d, flags = %x\n", 666 vmp->vm_opcode, vmp->vm_unique, vmp->vm_flags)); 667 668 TAILQ_REMOVE(&vcp->vc_requests, vmp, vm_chain); 669 error = EINTR; 670 } 671 672 else { 673 /* (!(vmp->vm_flags & VM_WRITE)) means interrupted after 674 upcall started */ 675 /* Interrupted after start of upcall, send venus a signal */ 676 struct coda_in_hdr *dog; 677 struct vmsg *svmp; 678 679 #ifdef CODA_VERBOSE 680 if (1) 681 #else 682 if (codadebug) 683 #endif 684 myprintf(("Sending Venus a signal: op = %d.%d, flags = %x\n", 685 vmp->vm_opcode, vmp->vm_unique, vmp->vm_flags)); 686 687 TAILQ_REMOVE(&vcp->vc_replies, vmp, vm_chain); 688 error = EINTR; 689 690 CODA_ALLOC(svmp, struct vmsg *, sizeof (struct vmsg)); 691 692 CODA_ALLOC((svmp->vm_data), char *, sizeof (struct coda_in_hdr)); 693 dog = (struct coda_in_hdr *)svmp->vm_data; 694 695 svmp->vm_flags = 0; 696 dog->opcode = svmp->vm_opcode = CODA_SIGNAL; 697 dog->unique = svmp->vm_unique = vmp->vm_unique; 698 svmp->vm_inSize = sizeof (struct coda_in_hdr); 699 /*??? rvb */ svmp->vm_outSize = sizeof (struct coda_in_hdr); 700 701 if (codadebug) 702 myprintf(("coda_call: enqueing signal msg (%d, %d)\n", 703 svmp->vm_opcode, svmp->vm_unique)); 704 705 /* insert at head of queue */ 706 TAILQ_INSERT_HEAD(&vcp->vc_requests, svmp, vm_chain); 707 selnotify(&(vcp->vc_selproc), 0, 0); 708 } 709 } 710 711 else { /* If venus died (!VC_OPEN(vcp)) */ 712 if (codadebug) 713 myprintf(("vcclose woke op %d.%d flags %d\n", 714 vmp->vm_opcode, vmp->vm_unique, vmp->vm_flags)); 715 716 error = ENODEV; 717 } 718 719 CODA_FREE(vmp, sizeof(struct vmsg)); 720 721 if (outstanding_upcalls > 0 && (--outstanding_upcalls == 0)) 722 wakeup(&outstanding_upcalls); 723 724 if (!error) 725 error = ((struct coda_out_hdr *)buffer)->result; 726 return(error); 727 } 728 729 MODULE(MODULE_CLASS_DRIVER, vcoda, NULL); 730 731 static int 732 vcoda_modcmd(modcmd_t cmd, void *arg) 733 { 734 int cmajor, dmajor, error = 0; 735 736 dmajor = cmajor = -1; 737 738 switch (cmd) { 739 case MODULE_CMD_INIT: 740 #ifdef _MODULE 741 vcodaattach(NVCODA); 742 743 return devsw_attach("vcoda", NULL, &dmajor, 744 &vcoda_cdevsw, &cmajor); 745 #endif 746 break; 747 748 case MODULE_CMD_FINI: 749 #ifdef _MODULE 750 { 751 for (size_t i = 0; i < NVCODA; i++) { 752 struct vcomm *vcp = &coda_mnttbl[i].mi_vcomm; 753 if (VC_OPEN(vcp)) 754 return EBUSY; 755 } 756 return devsw_detach(NULL, &vcoda_cdevsw); 757 } 758 #endif 759 break; 760 761 case MODULE_CMD_STAT: 762 return ENOTTY; 763 764 default: 765 return ENOTTY; 766 } 767 return error; 768 } 769
Indexes created Tue Sep 30 20:09:53 GMT 2025