coda_vnops.c revision 1.38
1 /* 2 coda_create/vn_open 3 remove/unlink 4 link 5 mkdir 6 rmdir 7 symlink 8 */ 9 /* $NetBSD: coda_vnops.c,v 1.38 2003/10/30 02:07:38 simonb Exp $ */ 10 11 /* 12 * 13 * Coda: an Experimental Distributed File System 14 * Release 3.1 15 * 16 * Copyright (c) 1987-1998 Carnegie Mellon University 17 * All Rights Reserved 18 * 19 * Permission to use, copy, modify and distribute this software and its 20 * documentation is hereby granted, provided that both the copyright 21 * notice and this permission notice appear in all copies of the 22 * software, derivative works or modified versions, and any portions 23 * thereof, and that both notices appear in supporting documentation, and 24 * that credit is given to Carnegie Mellon University in all documents 25 * and publicity pertaining to direct or indirect use of this code or its 26 * derivatives. 27 * 28 * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS, 29 * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS 30 * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON 31 * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER 32 * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF 33 * ANY DERIVATIVE WORK. 34 * 35 * Carnegie Mellon encourages users of this software to return any 36 * improvements or extensions that they make, and to grant Carnegie 37 * Mellon the rights to redistribute these changes without encumbrance. 38 * 39 * @(#) coda/coda_vnops.c,v 1.1.1.1 1998/08/29 21:26:46 rvb Exp $ 40 */ 41 42 /* 43 * Mach Operating System 44 * Copyright (c) 1990 Carnegie-Mellon University 45 * Copyright (c) 1989 Carnegie-Mellon University 46 * All rights reserved. The CMU software License Agreement specifies 47 * the terms and conditions for use and redistribution. 48 */ 49 50 /* 51 * This code was written for the Coda file system at Carnegie Mellon 52 * University. Contributers include David Steere, James Kistler, and 53 * M. Satyanarayanan. 54 */ 55 56 #include <sys/cdefs.h> 57 __KERNEL_RCSID(0, "$NetBSD: coda_vnops.c,v 1.38 2003/10/30 02:07:38 simonb Exp $"); 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/malloc.h> 62 #include <sys/errno.h> 63 #include <sys/acct.h> 64 #include <sys/file.h> 65 #include <sys/uio.h> 66 #include <sys/namei.h> 67 #include <sys/ioctl.h> 68 #include <sys/mount.h> 69 #include <sys/proc.h> 70 #include <sys/select.h> 71 #include <sys/user.h> 72 #include <miscfs/genfs/genfs.h> 73 74 #include <coda/coda.h> 75 #include <coda/cnode.h> 76 #include <coda/coda_vnops.h> 77 #include <coda/coda_venus.h> 78 #include <coda/coda_opstats.h> 79 #include <coda/coda_subr.h> 80 #include <coda/coda_namecache.h> 81 #include <coda/coda_pioctl.h> 82 83 /* 84 * These flags select various performance enhancements. 85 */ 86 int coda_attr_cache = 1; /* Set to cache attributes in the kernel */ 87 int coda_symlink_cache = 1; /* Set to cache symbolic link information */ 88 int coda_access_cache = 1; /* Set to handle some access checks directly */ 89 90 /* structure to keep track of vfs calls */ 91 92 struct coda_op_stats coda_vnodeopstats[CODA_VNODEOPS_SIZE]; 93 94 #define MARK_ENTRY(op) (coda_vnodeopstats[op].entries++) 95 #define MARK_INT_SAT(op) (coda_vnodeopstats[op].sat_intrn++) 96 #define MARK_INT_FAIL(op) (coda_vnodeopstats[op].unsat_intrn++) 97 #define MARK_INT_GEN(op) (coda_vnodeopstats[op].gen_intrn++) 98 99 /* What we are delaying for in printf */ 100 int coda_printf_delay = 0; /* in microseconds */ 101 int coda_vnop_print_entry = 0; 102 static int coda_lockdebug = 0; 103 104 /* Definition of the vfs operation vector */ 105 106 /* 107 * Some NetBSD details: 108 * 109 * coda_start is called at the end of the mount syscall. 110 * coda_init is called at boot time. 111 */ 112 113 #define ENTRY if(coda_vnop_print_entry) myprintf(("Entered %s\n",__func__)) 114 115 /* Definition of the vnode operation vector */ 116 117 const struct vnodeopv_entry_desc coda_vnodeop_entries[] = { 118 { &vop_default_desc, coda_vop_error }, 119 { &vop_lookup_desc, coda_lookup }, /* lookup */ 120 { &vop_create_desc, coda_create }, /* create */ 121 { &vop_mknod_desc, coda_vop_error }, /* mknod */ 122 { &vop_open_desc, coda_open }, /* open */ 123 { &vop_close_desc, coda_close }, /* close */ 124 { &vop_access_desc, coda_access }, /* access */ 125 { &vop_getattr_desc, coda_getattr }, /* getattr */ 126 { &vop_setattr_desc, coda_setattr }, /* setattr */ 127 { &vop_read_desc, coda_read }, /* read */ 128 { &vop_write_desc, coda_write }, /* write */ 129 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 130 { &vop_ioctl_desc, coda_ioctl }, /* ioctl */ 131 /* 1.3 { &vop_select_desc, coda_select }, select */ 132 { &vop_mmap_desc, genfs_mmap }, /* mmap */ 133 { &vop_fsync_desc, coda_fsync }, /* fsync */ 134 { &vop_remove_desc, coda_remove }, /* remove */ 135 { &vop_link_desc, coda_link }, /* link */ 136 { &vop_rename_desc, coda_rename }, /* rename */ 137 { &vop_mkdir_desc, coda_mkdir }, /* mkdir */ 138 { &vop_rmdir_desc, coda_rmdir }, /* rmdir */ 139 { &vop_symlink_desc, coda_symlink }, /* symlink */ 140 { &vop_readdir_desc, coda_readdir }, /* readdir */ 141 { &vop_readlink_desc, coda_readlink }, /* readlink */ 142 { &vop_abortop_desc, coda_abortop }, /* abortop */ 143 { &vop_inactive_desc, coda_inactive }, /* inactive */ 144 { &vop_reclaim_desc, coda_reclaim }, /* reclaim */ 145 { &vop_lock_desc, coda_lock }, /* lock */ 146 { &vop_unlock_desc, coda_unlock }, /* unlock */ 147 { &vop_bmap_desc, coda_bmap }, /* bmap */ 148 { &vop_strategy_desc, coda_strategy }, /* strategy */ 149 { &vop_print_desc, coda_vop_error }, /* print */ 150 { &vop_islocked_desc, coda_islocked }, /* islocked */ 151 { &vop_pathconf_desc, coda_vop_error }, /* pathconf */ 152 { &vop_advlock_desc, coda_vop_nop }, /* advlock */ 153 { &vop_bwrite_desc, coda_vop_error }, /* bwrite */ 154 { &vop_lease_desc, coda_vop_nop }, /* lease */ 155 { &vop_blkatoff_desc, coda_vop_error }, /* blkatoff */ 156 { &vop_valloc_desc, coda_vop_error }, /* valloc */ 157 { &vop_vfree_desc, coda_vop_error }, /* vfree */ 158 { &vop_truncate_desc, coda_vop_error }, /* truncate */ 159 { &vop_update_desc, coda_vop_error }, /* update */ 160 { &vop_seek_desc, genfs_seek }, /* seek */ 161 { &vop_poll_desc, genfs_poll }, /* poll */ 162 { &vop_getpages_desc, coda_getpages }, /* getpages */ 163 { &vop_putpages_desc, coda_putpages }, /* putpages */ 164 { NULL, NULL } 165 }; 166 167 const struct vnodeopv_desc coda_vnodeop_opv_desc = 168 { &coda_vnodeop_p, coda_vnodeop_entries }; 169 170 /* Definitions of NetBSD vnodeop interfaces */ 171 172 /* A generic panic: we were called with something we didn't define yet */ 173 int 174 coda_vop_error(void *anon) { 175 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 176 177 myprintf(("coda_vop_error: Vnode operation %s called, but not defined.\n", 178 (*desc)->vdesc_name)); 179 /* 180 panic("coda_nbsd_vop_error"); 181 return 0; 182 */ 183 return EIO; 184 } 185 186 /* A generic do-nothing. For lease_check, advlock */ 187 int 188 coda_vop_nop(void *anon) { 189 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 190 191 if (codadebug) { 192 myprintf(("Vnode operation %s called, but unsupported\n", 193 (*desc)->vdesc_name)); 194 } 195 return (0); 196 } 197 198 int 199 coda_vnodeopstats_init(void) 200 { 201 int i; 202 203 for(i=0;i<CODA_VNODEOPS_SIZE;i++) { 204 coda_vnodeopstats[i].opcode = i; 205 coda_vnodeopstats[i].entries = 0; 206 coda_vnodeopstats[i].sat_intrn = 0; 207 coda_vnodeopstats[i].unsat_intrn = 0; 208 coda_vnodeopstats[i].gen_intrn = 0; 209 } 210 211 return 0; 212 } 213 214 /* 215 * coda_open calls Venus to return the device, inode pair of the cache 216 * file holding the data. Using iget, coda_open finds the vnode of the 217 * cache file, and then opens it. 218 */ 219 int 220 coda_open(v) 221 void *v; 222 { 223 /* 224 * NetBSD can pass the O_EXCL flag in mode, even though the check 225 * has already happened. Venus defensively assumes that if open 226 * is passed the EXCL, it must be a bug. We strip the flag here. 227 */ 228 /* true args */ 229 struct vop_open_args *ap = v; 230 struct vnode **vpp = &(ap->a_vp); 231 struct cnode *cp = VTOC(*vpp); 232 int flag = ap->a_mode & (~O_EXCL); 233 struct ucred *cred = ap->a_cred; 234 struct proc *p = ap->a_p; 235 /* locals */ 236 int error; 237 struct vnode *vp; 238 dev_t dev; 239 ino_t inode; 240 241 MARK_ENTRY(CODA_OPEN_STATS); 242 243 /* Check for open of control file. */ 244 if (IS_CTL_VP(*vpp)) { 245 /* XXX */ 246 /* if (WRITABLE(flag)) */ 247 if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) { 248 MARK_INT_FAIL(CODA_OPEN_STATS); 249 return(EACCES); 250 } 251 MARK_INT_SAT(CODA_OPEN_STATS); 252 return(0); 253 } 254 255 error = venus_open(vtomi((*vpp)), &cp->c_fid, flag, cred, p, &dev, &inode); 256 if (error) 257 return (error); 258 if (!error) { 259 CODADEBUG( CODA_OPEN,myprintf(("open: dev %d inode %d result %d\n", 260 dev, inode, error)); ) 261 } 262 263 /* Translate the <device, inode> pair for the cache file into 264 an inode pointer. */ 265 error = coda_grab_vnode(dev, inode, &vp); 266 if (error) 267 return (error); 268 269 /* We get the vnode back locked in both Mach and NetBSD. Needs unlocked */ 270 VOP_UNLOCK(vp, 0); 271 /* Keep a reference until the close comes in. */ 272 vref(*vpp); 273 274 /* Save the vnode pointer for the cache file. */ 275 if (cp->c_ovp == NULL) { 276 cp->c_ovp = vp; 277 } else { 278 if (cp->c_ovp != vp) 279 panic("coda_open: cp->c_ovp != ITOV(ip)"); 280 } 281 cp->c_ocount++; 282 283 /* Flush the attribute cached if writing the file. */ 284 if (flag & FWRITE) { 285 cp->c_owrite++; 286 cp->c_flags &= ~C_VATTR; 287 } 288 289 /* Save the <device, inode> pair for the cache file to speed 290 up subsequent page_read's. */ 291 cp->c_device = dev; 292 cp->c_inode = inode; 293 294 /* Open the cache file. */ 295 error = VOP_OPEN(vp, flag, cred, p); 296 return(error); 297 } 298 299 /* 300 * Close the cache file used for I/O and notify Venus. 301 */ 302 int 303 coda_close(v) 304 void *v; 305 { 306 /* true args */ 307 struct vop_close_args *ap = v; 308 struct vnode *vp = ap->a_vp; 309 struct cnode *cp = VTOC(vp); 310 int flag = ap->a_fflag; 311 struct ucred *cred = ap->a_cred; 312 struct proc *p = ap->a_p; 313 /* locals */ 314 int error; 315 316 MARK_ENTRY(CODA_CLOSE_STATS); 317 318 /* Check for close of control file. */ 319 if (IS_CTL_VP(vp)) { 320 MARK_INT_SAT(CODA_CLOSE_STATS); 321 return(0); 322 } 323 324 if (IS_UNMOUNTING(cp)) { 325 if (cp->c_ovp) { 326 #ifdef CODA_VERBOSE 327 printf("coda_close: destroying container ref %d, ufs vp %p of vp %p/cp %p\n", 328 vp->v_usecount, cp->c_ovp, vp, cp); 329 #endif 330 #ifdef hmm 331 vgone(cp->c_ovp); 332 #else 333 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 334 VOP_CLOSE(cp->c_ovp, flag, cred, p); /* Do errors matter here? */ 335 vput(cp->c_ovp); 336 #endif 337 } else { 338 #ifdef CODA_VERBOSE 339 printf("coda_close: NO container vp %p/cp %p\n", vp, cp); 340 #endif 341 } 342 return ENODEV; 343 } else { 344 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 345 VOP_CLOSE(cp->c_ovp, flag, cred, p); /* Do errors matter here? */ 346 vput(cp->c_ovp); 347 } 348 349 if (--cp->c_ocount == 0) 350 cp->c_ovp = NULL; 351 352 if (flag & FWRITE) /* file was opened for write */ 353 --cp->c_owrite; 354 355 error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, p); 356 vrele(CTOV(cp)); 357 358 CODADEBUG(CODA_CLOSE, myprintf(("close: result %d\n",error)); ) 359 return(error); 360 } 361 362 int 363 coda_read(v) 364 void *v; 365 { 366 struct vop_read_args *ap = v; 367 368 ENTRY; 369 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, 370 ap->a_ioflag, ap->a_cred, ap->a_uio->uio_procp)); 371 } 372 373 int 374 coda_write(v) 375 void *v; 376 { 377 struct vop_write_args *ap = v; 378 379 ENTRY; 380 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, 381 ap->a_ioflag, ap->a_cred, ap->a_uio->uio_procp)); 382 } 383 384 int 385 coda_rdwr(vp, uiop, rw, ioflag, cred, p) 386 struct vnode *vp; 387 struct uio *uiop; 388 enum uio_rw rw; 389 int ioflag; 390 struct ucred *cred; 391 struct proc *p; 392 { 393 /* upcall decl */ 394 /* NOTE: container file operation!!! */ 395 /* locals */ 396 struct cnode *cp = VTOC(vp); 397 struct vnode *cfvp = cp->c_ovp; 398 int opened_internally = 0; 399 int error = 0; 400 401 MARK_ENTRY(CODA_RDWR_STATS); 402 403 CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld, %d)\n", rw, 404 uiop->uio_iov->iov_base, 405 (unsigned long) uiop->uio_resid, 406 (long long) uiop->uio_offset, uiop->uio_segflg)); ) 407 408 /* Check for rdwr of control object. */ 409 if (IS_CTL_VP(vp)) { 410 MARK_INT_FAIL(CODA_RDWR_STATS); 411 return(EINVAL); 412 } 413 414 /* Redirect the request to UFS. */ 415 416 /* 417 * If file is not already open this must be a page 418 * {read,write} request. Iget the cache file's inode 419 * pointer if we still have its <device, inode> pair. 420 * Otherwise, we must do an internal open to derive the 421 * pair. 422 */ 423 if (cfvp == NULL) { 424 /* 425 * If we're dumping core, do the internal open. Otherwise 426 * venus won't have the correct size of the core when 427 * it's completely written. 428 */ 429 if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) { 430 error = coda_grab_vnode(cp->c_device, cp->c_inode, &cfvp); 431 if (error) { 432 MARK_INT_FAIL(CODA_RDWR_STATS); 433 return(error); 434 } 435 /* 436 * We get the vnode back locked in both Mach and 437 * NetBSD. Needs unlocked 438 */ 439 VOP_UNLOCK(cfvp, 0); 440 } 441 else { 442 opened_internally = 1; 443 MARK_INT_GEN(CODA_OPEN_STATS); 444 error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), 445 cred, p); 446 #ifdef CODA_VERBOSE 447 printf("coda_rdwr: Internally Opening %p\n", vp); 448 #endif 449 if (error) { 450 MARK_INT_FAIL(CODA_RDWR_STATS); 451 return(error); 452 } 453 cfvp = cp->c_ovp; 454 } 455 } 456 457 /* Have UFS handle the call. */ 458 CODADEBUG(CODA_RDWR, myprintf(("indirect rdwr: fid = %s, refcnt = %d\n", 459 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); ) 460 461 if (rw == UIO_READ) { 462 error = VOP_READ(cfvp, uiop, ioflag, cred); 463 } else { 464 error = VOP_WRITE(cfvp, uiop, ioflag, cred); 465 } 466 467 if (error) 468 MARK_INT_FAIL(CODA_RDWR_STATS); 469 else 470 MARK_INT_SAT(CODA_RDWR_STATS); 471 472 /* Do an internal close if necessary. */ 473 if (opened_internally) { 474 MARK_INT_GEN(CODA_CLOSE_STATS); 475 (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred, p); 476 } 477 478 /* Invalidate cached attributes if writing. */ 479 if (rw == UIO_WRITE) 480 cp->c_flags &= ~C_VATTR; 481 return(error); 482 } 483 484 int 485 coda_ioctl(v) 486 void *v; 487 { 488 /* true args */ 489 struct vop_ioctl_args *ap = v; 490 struct vnode *vp = ap->a_vp; 491 int com = ap->a_command; 492 caddr_t data = ap->a_data; 493 int flag = ap->a_fflag; 494 struct ucred *cred = ap->a_cred; 495 struct proc *p = ap->a_p; 496 /* locals */ 497 int error; 498 struct vnode *tvp; 499 struct nameidata ndp; 500 struct PioctlData *iap = (struct PioctlData *)data; 501 502 MARK_ENTRY(CODA_IOCTL_STATS); 503 504 CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));) 505 506 /* Don't check for operation on a dying object, for ctlvp it 507 shouldn't matter */ 508 509 /* Must be control object to succeed. */ 510 if (!IS_CTL_VP(vp)) { 511 MARK_INT_FAIL(CODA_IOCTL_STATS); 512 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: vp != ctlvp"));) 513 return (EOPNOTSUPP); 514 } 515 /* Look up the pathname. */ 516 517 /* Should we use the name cache here? It would get it from 518 lookupname sooner or later anyway, right? */ 519 520 NDINIT(&ndp, LOOKUP, (iap->follow ? FOLLOW : NOFOLLOW), UIO_USERSPACE, ((caddr_t)iap->path), p); 521 error = namei(&ndp); 522 tvp = ndp.ni_vp; 523 524 if (error) { 525 MARK_INT_FAIL(CODA_IOCTL_STATS); 526 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: lookup returns %d\n", 527 error));) 528 return(error); 529 } 530 531 /* 532 * Make sure this is a coda style cnode, but it may be a 533 * different vfsp 534 */ 535 /* XXX: this totally violates the comment about vtagtype in vnode.h */ 536 if (tvp->v_tag != VT_CODA) { 537 vrele(tvp); 538 MARK_INT_FAIL(CODA_IOCTL_STATS); 539 CODADEBUG(CODA_IOCTL, 540 myprintf(("coda_ioctl error: %s not a coda object\n", 541 iap->path));) 542 return(EINVAL); 543 } 544 545 if (iap->vi.in_size > VC_MAXDATASIZE) { 546 vrele(tvp); 547 return(EINVAL); 548 } 549 error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, cred, p); 550 551 if (error) 552 MARK_INT_FAIL(CODA_IOCTL_STATS); 553 else 554 CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); ) 555 556 vrele(tvp); 557 return(error); 558 } 559 560 /* 561 * To reduce the cost of a user-level venus;we cache attributes in 562 * the kernel. Each cnode has storage allocated for an attribute. If 563 * c_vattr is valid, return a reference to it. Otherwise, get the 564 * attributes from venus and store them in the cnode. There is some 565 * question if this method is a security leak. But I think that in 566 * order to make this call, the user must have done a lookup and 567 * opened the file, and therefore should already have access. 568 */ 569 int 570 coda_getattr(v) 571 void *v; 572 { 573 /* true args */ 574 struct vop_getattr_args *ap = v; 575 struct vnode *vp = ap->a_vp; 576 struct cnode *cp = VTOC(vp); 577 struct vattr *vap = ap->a_vap; 578 struct ucred *cred = ap->a_cred; 579 struct proc *p = ap->a_p; 580 /* locals */ 581 int error; 582 583 MARK_ENTRY(CODA_GETATTR_STATS); 584 585 /* Check for getattr of control object. */ 586 if (IS_CTL_VP(vp)) { 587 MARK_INT_FAIL(CODA_GETATTR_STATS); 588 return(ENOENT); 589 } 590 591 /* Check to see if the attributes have already been cached */ 592 if (VALID_VATTR(cp)) { 593 CODADEBUG(CODA_GETATTR, { myprintf(("attr cache hit: %s\n", 594 coda_f2s(&cp->c_fid)));}); 595 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 596 print_vattr(&cp->c_vattr); ); 597 598 *vap = cp->c_vattr; 599 MARK_INT_SAT(CODA_GETATTR_STATS); 600 return(0); 601 } 602 603 error = venus_getattr(vtomi(vp), &cp->c_fid, cred, p, vap); 604 605 if (!error) { 606 CODADEBUG(CODA_GETATTR, myprintf(("getattr miss %s: result %d\n", 607 coda_f2s(&cp->c_fid), error)); ) 608 609 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 610 print_vattr(vap); ); 611 612 /* If not open for write, store attributes in cnode */ 613 if ((cp->c_owrite == 0) && (coda_attr_cache)) { 614 cp->c_vattr = *vap; 615 cp->c_flags |= C_VATTR; 616 } 617 618 } 619 return(error); 620 } 621 622 int 623 coda_setattr(v) 624 void *v; 625 { 626 /* true args */ 627 struct vop_setattr_args *ap = v; 628 struct vnode *vp = ap->a_vp; 629 struct cnode *cp = VTOC(vp); 630 struct vattr *vap = ap->a_vap; 631 struct ucred *cred = ap->a_cred; 632 struct proc *p = ap->a_p; 633 /* locals */ 634 int error; 635 636 MARK_ENTRY(CODA_SETATTR_STATS); 637 638 /* Check for setattr of control object. */ 639 if (IS_CTL_VP(vp)) { 640 MARK_INT_FAIL(CODA_SETATTR_STATS); 641 return(ENOENT); 642 } 643 644 if (codadebug & CODADBGMSK(CODA_SETATTR)) { 645 print_vattr(vap); 646 } 647 error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, p); 648 649 if (!error) 650 cp->c_flags &= ~C_VATTR; 651 652 CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); ) 653 return(error); 654 } 655 656 int 657 coda_access(v) 658 void *v; 659 { 660 /* true args */ 661 struct vop_access_args *ap = v; 662 struct vnode *vp = ap->a_vp; 663 struct cnode *cp = VTOC(vp); 664 int mode = ap->a_mode; 665 struct ucred *cred = ap->a_cred; 666 struct proc *p = ap->a_p; 667 /* locals */ 668 int error; 669 670 MARK_ENTRY(CODA_ACCESS_STATS); 671 672 /* Check for access of control object. Only read access is 673 allowed on it. */ 674 if (IS_CTL_VP(vp)) { 675 /* bogus hack - all will be marked as successes */ 676 MARK_INT_SAT(CODA_ACCESS_STATS); 677 return(((mode & VREAD) && !(mode & (VWRITE | VEXEC))) 678 ? 0 : EACCES); 679 } 680 681 /* 682 * if the file is a directory, and we are checking exec (eg lookup) 683 * access, and the file is in the namecache, then the user must have 684 * lookup access to it. 685 */ 686 if (coda_access_cache) { 687 if ((vp->v_type == VDIR) && (mode & VEXEC)) { 688 if (coda_nc_lookup(cp, ".", 1, cred)) { 689 MARK_INT_SAT(CODA_ACCESS_STATS); 690 return(0); /* it was in the cache */ 691 } 692 } 693 } 694 695 error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, p); 696 697 return(error); 698 } 699 700 /* 701 * CODA abort op, called after namei() when a CREATE/DELETE isn't actually 702 * done. If a buffer has been saved in anticipation of a coda_create or 703 * a coda_remove, delete it. 704 */ 705 /* ARGSUSED */ 706 int 707 coda_abortop(v) 708 void *v; 709 { 710 /* true args */ 711 struct vop_abortop_args /* { 712 struct vnode *a_dvp; 713 struct componentname *a_cnp; 714 } */ *ap = v; 715 /* upcall decl */ 716 /* locals */ 717 718 if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF) 719 PNBUF_PUT(ap->a_cnp->cn_pnbuf); 720 return (0); 721 } 722 723 int 724 coda_readlink(v) 725 void *v; 726 { 727 /* true args */ 728 struct vop_readlink_args *ap = v; 729 struct vnode *vp = ap->a_vp; 730 struct cnode *cp = VTOC(vp); 731 struct uio *uiop = ap->a_uio; 732 struct ucred *cred = ap->a_cred; 733 struct proc *p = ap->a_uio->uio_procp; 734 /* locals */ 735 int error; 736 char *str; 737 int len; 738 739 MARK_ENTRY(CODA_READLINK_STATS); 740 741 /* Check for readlink of control object. */ 742 if (IS_CTL_VP(vp)) { 743 MARK_INT_FAIL(CODA_READLINK_STATS); 744 return(ENOENT); 745 } 746 747 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */ 748 uiop->uio_rw = UIO_READ; 749 error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop); 750 if (error) 751 MARK_INT_FAIL(CODA_READLINK_STATS); 752 else 753 MARK_INT_SAT(CODA_READLINK_STATS); 754 return(error); 755 } 756 757 error = venus_readlink(vtomi(vp), &cp->c_fid, cred, p, &str, &len); 758 759 if (!error) { 760 uiop->uio_rw = UIO_READ; 761 error = uiomove(str, len, uiop); 762 763 if (coda_symlink_cache) { 764 cp->c_symlink = str; 765 cp->c_symlen = len; 766 cp->c_flags |= C_SYMLINK; 767 } else 768 CODA_FREE(str, len); 769 } 770 771 CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));) 772 return(error); 773 } 774 775 int 776 coda_fsync(v) 777 void *v; 778 { 779 /* true args */ 780 struct vop_fsync_args *ap = v; 781 struct vnode *vp = ap->a_vp; 782 struct cnode *cp = VTOC(vp); 783 struct ucred *cred = ap->a_cred; 784 struct proc *p = ap->a_p; 785 /* locals */ 786 struct vnode *convp = cp->c_ovp; 787 int error; 788 789 MARK_ENTRY(CODA_FSYNC_STATS); 790 791 /* Check for fsync on an unmounting object */ 792 /* The NetBSD kernel, in it's infinite wisdom, can try to fsync 793 * after an unmount has been initiated. This is a Bad Thing, 794 * which we have to avoid. Not a legitimate failure for stats. 795 */ 796 if (IS_UNMOUNTING(cp)) { 797 return(ENODEV); 798 } 799 800 /* Check for fsync of control object. */ 801 if (IS_CTL_VP(vp)) { 802 MARK_INT_SAT(CODA_FSYNC_STATS); 803 return(0); 804 } 805 806 if (convp) 807 VOP_FSYNC(convp, cred, MNT_WAIT, 0, 0, p); 808 809 /* 810 * We can expect fsync on any vnode at all if venus is pruging it. 811 * Venus can't very well answer the fsync request, now can it? 812 * Hopefully, it won't have to, because hopefully, venus preserves 813 * the (possibly untrue) invariant that it never purges an open 814 * vnode. Hopefully. 815 */ 816 if (cp->c_flags & C_PURGING) { 817 return(0); 818 } 819 820 error = venus_fsync(vtomi(vp), &cp->c_fid, cred, p); 821 822 CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); ); 823 return(error); 824 } 825 826 int 827 coda_inactive(v) 828 void *v; 829 { 830 /* XXX - at the moment, inactive doesn't look at cred, and doesn't 831 have a proc pointer. Oops. */ 832 /* true args */ 833 struct vop_inactive_args *ap = v; 834 struct vnode *vp = ap->a_vp; 835 struct cnode *cp = VTOC(vp); 836 struct ucred *cred __attribute__((unused)) = NULL; 837 struct proc *p __attribute__((unused)) = curproc; 838 /* upcall decl */ 839 /* locals */ 840 841 /* We don't need to send inactive to venus - DCS */ 842 MARK_ENTRY(CODA_INACTIVE_STATS); 843 844 if (IS_CTL_VP(vp)) { 845 MARK_INT_SAT(CODA_INACTIVE_STATS); 846 return 0; 847 } 848 849 CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n", 850 coda_f2s(&cp->c_fid), vp->v_mount));) 851 852 /* If an array has been allocated to hold the symlink, deallocate it */ 853 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { 854 if (cp->c_symlink == NULL) 855 panic("coda_inactive: null symlink pointer in cnode"); 856 857 CODA_FREE(cp->c_symlink, cp->c_symlen); 858 cp->c_flags &= ~C_SYMLINK; 859 cp->c_symlen = 0; 860 } 861 862 /* Remove it from the table so it can't be found. */ 863 coda_unsave(cp); 864 if (vp->v_mount->mnt_data == NULL) { 865 myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n", vp)); 866 panic("badness in coda_inactive"); 867 } 868 869 if (IS_UNMOUNTING(cp)) { 870 #ifdef DEBUG 871 printf("coda_inactive: IS_UNMOUNTING use %d: vp %p, cp %p\n", vp->v_usecount, vp, cp); 872 if (cp->c_ovp != NULL) 873 printf("coda_inactive: cp->ovp != NULL use %d: vp %p, cp %p\n", 874 vp->v_usecount, vp, cp); 875 #endif 876 lockmgr(&vp->v_lock, LK_RELEASE, &vp->v_interlock); 877 } else { 878 #ifdef OLD_DIAGNOSTIC 879 if (CTOV(cp)->v_usecount) { 880 panic("coda_inactive: nonzero reference count"); 881 } 882 if (cp->c_ovp != NULL) { 883 panic("coda_inactive: cp->ovp != NULL"); 884 } 885 #endif 886 VOP_UNLOCK(vp, 0); 887 vgone(vp); 888 } 889 890 MARK_INT_SAT(CODA_INACTIVE_STATS); 891 return(0); 892 } 893 894 /* 895 * Remote file system operations having to do with directory manipulation. 896 */ 897 898 /* 899 * It appears that in NetBSD, lookup is supposed to return the vnode locked 900 */ 901 int 902 coda_lookup(v) 903 void *v; 904 { 905 /* true args */ 906 struct vop_lookup_args *ap = v; 907 struct vnode *dvp = ap->a_dvp; 908 struct cnode *dcp = VTOC(dvp); 909 struct vnode **vpp = ap->a_vpp; 910 /* 911 * It looks as though ap->a_cnp->ni_cnd->cn_nameptr holds the rest 912 * of the string to xlate, and that we must try to get at least 913 * ap->a_cnp->ni_cnd->cn_namelen of those characters to macth. I 914 * could be wrong. 915 */ 916 struct componentname *cnp = ap->a_cnp; 917 struct ucred *cred = cnp->cn_cred; 918 struct proc *p = cnp->cn_proc; 919 /* locals */ 920 struct cnode *cp; 921 const char *nm = cnp->cn_nameptr; 922 int len = cnp->cn_namelen; 923 CodaFid VFid; 924 int vtype; 925 int error = 0; 926 927 cnp->cn_flags &= ~PDIRUNLOCK; 928 929 MARK_ENTRY(CODA_LOOKUP_STATS); 930 931 CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s in %s\n", 932 nm, coda_f2s(&dcp->c_fid)));); 933 934 /* Check for lookup of control object. */ 935 if (IS_CTL_NAME(dvp, nm, len)) { 936 *vpp = coda_ctlvp; 937 vref(*vpp); 938 MARK_INT_SAT(CODA_LOOKUP_STATS); 939 goto exit; 940 } 941 942 if (len+1 > CODA_MAXNAMLEN) { 943 MARK_INT_FAIL(CODA_LOOKUP_STATS); 944 CODADEBUG(CODA_LOOKUP, myprintf(("name too long: lookup, %s (%s)\n", 945 coda_f2s(&dcp->c_fid), nm));); 946 *vpp = (struct vnode *)0; 947 error = EINVAL; 948 goto exit; 949 } 950 /* First try to look the file up in the cfs name cache */ 951 /* lock the parent vnode? */ 952 cp = coda_nc_lookup(dcp, nm, len, cred); 953 if (cp) { 954 *vpp = CTOV(cp); 955 vref(*vpp); 956 CODADEBUG(CODA_LOOKUP, 957 myprintf(("lookup result %d vpp %p\n",error,*vpp));) 958 } else { 959 960 /* The name wasn't cached, so we need to contact Venus */ 961 error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, p, &VFid, &vtype); 962 963 if (error) { 964 MARK_INT_FAIL(CODA_LOOKUP_STATS); 965 CODADEBUG(CODA_LOOKUP, myprintf(("lookup error on %s (%s)%d\n", 966 coda_f2s(&dcp->c_fid), nm, error));) 967 *vpp = (struct vnode *)0; 968 } else { 969 MARK_INT_SAT(CODA_LOOKUP_STATS); 970 CODADEBUG(CODA_LOOKUP, 971 myprintf(("lookup: %s type %o result %d\n", 972 coda_f2s(&VFid), vtype, error)); ) 973 974 cp = make_coda_node(&VFid, dvp->v_mount, vtype); 975 *vpp = CTOV(cp); 976 977 /* enter the new vnode in the Name Cache only if the top bit isn't set */ 978 /* And don't enter a new vnode for an invalid one! */ 979 if (!(vtype & CODA_NOCACHE)) 980 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 981 } 982 } 983 984 exit: 985 /* 986 * If we are creating, and this was the last name to be looked up, 987 * and the error was ENOENT, then there really shouldn't be an 988 * error and we can make the leaf NULL and return success. Since 989 * this is supposed to work under Mach as well as NetBSD, we're 990 * leaving this fn wrapped. We also must tell lookup/namei that 991 * we need to save the last component of the name. (Create will 992 * have to free the name buffer later...lucky us...) 993 */ 994 if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) 995 && (cnp->cn_flags & ISLASTCN) 996 && (error == ENOENT)) 997 { 998 error = EJUSTRETURN; 999 cnp->cn_flags |= SAVENAME; 1000 *ap->a_vpp = NULL; 1001 } 1002 1003 /* 1004 * If we are removing, and we are at the last element, and we 1005 * found it, then we need to keep the name around so that the 1006 * removal will go ahead as planned. Unfortunately, this will 1007 * probably also lock the to-be-removed vnode, which may or may 1008 * not be a good idea. I'll have to look at the bits of 1009 * coda_remove to make sure. We'll only save the name if we did in 1010 * fact find the name, otherwise coda_remove won't have a chance 1011 * to free the pathname. 1012 */ 1013 if ((cnp->cn_nameiop == DELETE) 1014 && (cnp->cn_flags & ISLASTCN) 1015 && !error) 1016 { 1017 cnp->cn_flags |= SAVENAME; 1018 } 1019 1020 /* 1021 * If the lookup went well, we need to (potentially?) unlock the 1022 * parent, and lock the child. We are only responsible for 1023 * checking to see if the parent is supposed to be unlocked before 1024 * we return. We must always lock the child (provided there is 1025 * one, and (the parent isn't locked or it isn't the same as the 1026 * parent.) Simple, huh? We can never leave the parent locked unless 1027 * we are ISLASTCN 1028 */ 1029 if (!error || (error == EJUSTRETURN)) { 1030 if (!(cnp->cn_flags & LOCKPARENT) || !(cnp->cn_flags & ISLASTCN)) { 1031 if ((error = VOP_UNLOCK(dvp, 0))) { 1032 return error; 1033 } 1034 cnp->cn_flags |= PDIRUNLOCK; 1035 /* 1036 * The parent is unlocked. As long as there is a child, 1037 * lock it without bothering to check anything else. 1038 */ 1039 if (*ap->a_vpp) { 1040 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1041 printf("coda_lookup: "); 1042 panic("unlocked parent but couldn't lock child"); 1043 } 1044 } 1045 } else { 1046 /* The parent is locked, and may be the same as the child */ 1047 if (*ap->a_vpp && (*ap->a_vpp != dvp)) { 1048 /* Different, go ahead and lock it. */ 1049 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1050 printf("coda_lookup: "); 1051 panic("unlocked parent but couldn't lock child"); 1052 } 1053 } 1054 } 1055 } else { 1056 /* If the lookup failed, we need to ensure that the leaf is NULL */ 1057 /* Don't change any locking? */ 1058 *ap->a_vpp = NULL; 1059 } 1060 return(error); 1061 } 1062 1063 /*ARGSUSED*/ 1064 int 1065 coda_create(v) 1066 void *v; 1067 { 1068 /* true args */ 1069 struct vop_create_args *ap = v; 1070 struct vnode *dvp = ap->a_dvp; 1071 struct cnode *dcp = VTOC(dvp); 1072 struct vattr *va = ap->a_vap; 1073 int exclusive = 1; 1074 int mode = ap->a_vap->va_mode; 1075 struct vnode **vpp = ap->a_vpp; 1076 struct componentname *cnp = ap->a_cnp; 1077 struct ucred *cred = cnp->cn_cred; 1078 struct proc *p = cnp->cn_proc; 1079 /* locals */ 1080 int error; 1081 struct cnode *cp; 1082 const char *nm = cnp->cn_nameptr; 1083 int len = cnp->cn_namelen; 1084 CodaFid VFid; 1085 struct vattr attr; 1086 1087 MARK_ENTRY(CODA_CREATE_STATS); 1088 1089 /* All creates are exclusive XXX */ 1090 /* I'm assuming the 'mode' argument is the file mode bits XXX */ 1091 1092 /* Check for create of control object. */ 1093 if (IS_CTL_NAME(dvp, nm, len)) { 1094 *vpp = (struct vnode *)0; 1095 MARK_INT_FAIL(CODA_CREATE_STATS); 1096 return(EACCES); 1097 } 1098 1099 error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, p, &VFid, &attr); 1100 1101 if (!error) { 1102 1103 /* If this is an exclusive create, panic if the file already exists. */ 1104 /* Venus should have detected the file and reported EEXIST. */ 1105 1106 if ((exclusive == 1) && 1107 (coda_find(&VFid) != NULL)) 1108 panic("cnode existed for newly created file!"); 1109 1110 cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); 1111 *vpp = CTOV(cp); 1112 1113 /* Update va to reflect the new attributes. */ 1114 (*va) = attr; 1115 1116 /* Update the attribute cache and mark it as valid */ 1117 if (coda_attr_cache) { 1118 VTOC(*vpp)->c_vattr = attr; 1119 VTOC(*vpp)->c_flags |= C_VATTR; 1120 } 1121 1122 /* Invalidate the parent's attr cache, the modification time has changed */ 1123 VTOC(dvp)->c_flags &= ~C_VATTR; 1124 1125 /* enter the new vnode in the Name Cache */ 1126 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1127 1128 CODADEBUG(CODA_CREATE, 1129 myprintf(("create: %s, result %d\n", 1130 coda_f2s(&VFid), error)); ) 1131 } else { 1132 *vpp = (struct vnode *)0; 1133 CODADEBUG(CODA_CREATE, myprintf(("create error %d\n", error));) 1134 } 1135 1136 /* Locking strategy. */ 1137 /* 1138 * In NetBSD, all creates must explicitly vput their dvp's. We'll 1139 * go ahead and use the LOCKLEAF flag of the cnp argument. 1140 * However, I'm pretty sure that create must return the leaf 1141 * locked; so there is a DIAGNOSTIC check to ensure that this is 1142 * true. 1143 */ 1144 vput(dvp); 1145 if (!error) { 1146 if (cnp->cn_flags & LOCKLEAF) { 1147 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1148 printf("coda_create: "); 1149 panic("unlocked parent but couldn't lock child"); 1150 } 1151 } 1152 #ifdef OLD_DIAGNOSTIC 1153 else { 1154 printf("coda_create: LOCKLEAF not set!\n"); 1155 } 1156 #endif 1157 } 1158 /* Have to free the previously saved name */ 1159 /* 1160 * This condition is stolen from ufs_makeinode. I have no idea 1161 * why it's here, but what the hey... 1162 */ 1163 if ((cnp->cn_flags & SAVESTART) == 0) { 1164 PNBUF_PUT(cnp->cn_pnbuf); 1165 } 1166 return(error); 1167 } 1168 1169 int 1170 coda_remove(v) 1171 void *v; 1172 { 1173 /* true args */ 1174 struct vop_remove_args *ap = v; 1175 struct vnode *dvp = ap->a_dvp; 1176 struct cnode *cp = VTOC(dvp); 1177 struct componentname *cnp = ap->a_cnp; 1178 struct ucred *cred = cnp->cn_cred; 1179 struct proc *p = cnp->cn_proc; 1180 /* locals */ 1181 int error; 1182 const char *nm = cnp->cn_nameptr; 1183 int len = cnp->cn_namelen; 1184 struct cnode *tp; 1185 1186 MARK_ENTRY(CODA_REMOVE_STATS); 1187 1188 CODADEBUG(CODA_REMOVE, myprintf(("remove: %s in %s\n", 1189 nm, coda_f2s(&cp->c_fid)));); 1190 1191 /* Remove the file's entry from the CODA Name Cache */ 1192 /* We're being conservative here, it might be that this person 1193 * doesn't really have sufficient access to delete the file 1194 * but we feel zapping the entry won't really hurt anyone -- dcs 1195 */ 1196 /* I'm gonna go out on a limb here. If a file and a hardlink to it 1197 * exist, and one is removed, the link count on the other will be 1198 * off by 1. We could either invalidate the attrs if cached, or 1199 * fix them. I'll try to fix them. DCS 11/8/94 1200 */ 1201 tp = coda_nc_lookup(VTOC(dvp), nm, len, cred); 1202 if (tp) { 1203 if (VALID_VATTR(tp)) { /* If attrs are cached */ 1204 if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */ 1205 tp->c_vattr.va_nlink--; 1206 } 1207 } 1208 1209 coda_nc_zapfile(VTOC(dvp), nm, len); 1210 /* No need to flush it if it doesn't exist! */ 1211 } 1212 /* Invalidate the parent's attr cache, the modification time has changed */ 1213 VTOC(dvp)->c_flags &= ~C_VATTR; 1214 1215 /* Check for remove of control object. */ 1216 if (IS_CTL_NAME(dvp, nm, len)) { 1217 MARK_INT_FAIL(CODA_REMOVE_STATS); 1218 return(ENOENT); 1219 } 1220 1221 error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, p); 1222 1223 CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); ) 1224 1225 /* 1226 * Regardless of what happens, we have to unconditionally drop 1227 * locks/refs on parent and child. (I hope). This is based on 1228 * what ufs_remove seems to be doing. 1229 */ 1230 if (dvp == ap->a_vp) { 1231 vrele(ap->a_vp); 1232 } else { 1233 vput(ap->a_vp); 1234 } 1235 vput(dvp); 1236 1237 if ((cnp->cn_flags & SAVESTART) == 0) { 1238 PNBUF_PUT(cnp->cn_pnbuf); 1239 } 1240 return(error); 1241 } 1242 1243 int 1244 coda_link(v) 1245 void *v; 1246 { 1247 /* true args */ 1248 struct vop_link_args *ap = v; 1249 struct vnode *vp = ap->a_vp; 1250 struct cnode *cp = VTOC(vp); 1251 struct vnode *tdvp = ap->a_dvp; 1252 struct cnode *tdcp = VTOC(tdvp); 1253 struct componentname *cnp = ap->a_cnp; 1254 struct ucred *cred = cnp->cn_cred; 1255 struct proc *p = cnp->cn_proc; 1256 /* locals */ 1257 int error; 1258 const char *nm = cnp->cn_nameptr; 1259 int len = cnp->cn_namelen; 1260 1261 MARK_ENTRY(CODA_LINK_STATS); 1262 1263 if (codadebug & CODADBGMSK(CODA_LINK)) { 1264 1265 myprintf(("nb_link: vp fid: %s\n", 1266 coda_f2s(&cp->c_fid))); 1267 myprintf(("nb_link: tdvp fid: %s)\n", 1268 coda_f2s(&tdcp->c_fid))); 1269 1270 } 1271 if (codadebug & CODADBGMSK(CODA_LINK)) { 1272 myprintf(("link: vp fid: %s\n", 1273 coda_f2s(&cp->c_fid))); 1274 myprintf(("link: tdvp fid: %s\n", 1275 coda_f2s(&tdcp->c_fid))); 1276 1277 } 1278 1279 /* Check for link to/from control object. */ 1280 if (IS_CTL_NAME(tdvp, nm, len) || IS_CTL_VP(vp)) { 1281 MARK_INT_FAIL(CODA_LINK_STATS); 1282 return(EACCES); 1283 } 1284 1285 /* 1286 * According to the ufs_link operation here's the locking situation: 1287 * We enter with the thing called "dvp" (the directory) locked. 1288 * We must unconditionally drop locks on "dvp" 1289 * 1290 * We enter with the thing called "vp" (the linked-to) unlocked, 1291 * but ref'd (?) 1292 * We seem to need to lock it before calling coda_link, and 1293 * unconditionally unlock it after. 1294 */ 1295 1296 if ((ap->a_vp != tdvp) && (error = vn_lock(ap->a_vp, LK_EXCLUSIVE))) { 1297 goto exit; 1298 } 1299 1300 error = venus_link(vtomi(vp), &cp->c_fid, &tdcp->c_fid, nm, len, cred, p); 1301 1302 /* Invalidate the parent's attr cache, the modification time has changed */ 1303 VTOC(tdvp)->c_flags &= ~C_VATTR; 1304 VTOC(vp)->c_flags &= ~C_VATTR; 1305 1306 CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); ) 1307 1308 exit: 1309 1310 if (ap->a_vp != tdvp) { 1311 VOP_UNLOCK(ap->a_vp, 0); 1312 } 1313 vput(tdvp); 1314 1315 /* Drop the name buffer if we don't need to SAVESTART */ 1316 if ((cnp->cn_flags & SAVESTART) == 0) { 1317 PNBUF_PUT(cnp->cn_pnbuf); 1318 } 1319 return(error); 1320 } 1321 1322 int 1323 coda_rename(v) 1324 void *v; 1325 { 1326 /* true args */ 1327 struct vop_rename_args *ap = v; 1328 struct vnode *odvp = ap->a_fdvp; 1329 struct cnode *odcp = VTOC(odvp); 1330 struct componentname *fcnp = ap->a_fcnp; 1331 struct vnode *ndvp = ap->a_tdvp; 1332 struct cnode *ndcp = VTOC(ndvp); 1333 struct componentname *tcnp = ap->a_tcnp; 1334 struct ucred *cred = fcnp->cn_cred; 1335 struct proc *p = fcnp->cn_proc; 1336 /* true args */ 1337 int error; 1338 const char *fnm = fcnp->cn_nameptr; 1339 int flen = fcnp->cn_namelen; 1340 const char *tnm = tcnp->cn_nameptr; 1341 int tlen = tcnp->cn_namelen; 1342 1343 MARK_ENTRY(CODA_RENAME_STATS); 1344 1345 /* Hmmm. The vnodes are already looked up. Perhaps they are locked? 1346 This could be Bad. XXX */ 1347 #ifdef OLD_DIAGNOSTIC 1348 if ((fcnp->cn_cred != tcnp->cn_cred) 1349 || (fcnp->cn_proc != tcnp->cn_proc)) 1350 { 1351 panic("coda_rename: component names don't agree"); 1352 } 1353 #endif 1354 1355 /* Check for rename involving control object. */ 1356 if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { 1357 MARK_INT_FAIL(CODA_RENAME_STATS); 1358 return(EACCES); 1359 } 1360 1361 /* Problem with moving directories -- need to flush entry for .. */ 1362 if (odvp != ndvp) { 1363 struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred); 1364 if (ovcp) { 1365 struct vnode *ovp = CTOV(ovcp); 1366 if ((ovp) && 1367 (ovp->v_type == VDIR)) /* If it's a directory */ 1368 coda_nc_zapfile(VTOC(ovp),"..", 2); 1369 } 1370 } 1371 1372 /* Remove the entries for both source and target files */ 1373 coda_nc_zapfile(VTOC(odvp), fnm, flen); 1374 coda_nc_zapfile(VTOC(ndvp), tnm, tlen); 1375 1376 /* Invalidate the parent's attr cache, the modification time has changed */ 1377 VTOC(odvp)->c_flags &= ~C_VATTR; 1378 VTOC(ndvp)->c_flags &= ~C_VATTR; 1379 1380 if (flen+1 > CODA_MAXNAMLEN) { 1381 MARK_INT_FAIL(CODA_RENAME_STATS); 1382 error = EINVAL; 1383 goto exit; 1384 } 1385 1386 if (tlen+1 > CODA_MAXNAMLEN) { 1387 MARK_INT_FAIL(CODA_RENAME_STATS); 1388 error = EINVAL; 1389 goto exit; 1390 } 1391 1392 error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, p); 1393 1394 exit: 1395 CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));) 1396 /* XXX - do we need to call cache pureg on the moved vnode? */ 1397 cache_purge(ap->a_fvp); 1398 1399 /* It seems to be incumbent on us to drop locks on all four vnodes */ 1400 /* From-vnodes are not locked, only ref'd. To-vnodes are locked. */ 1401 1402 vrele(ap->a_fvp); 1403 vrele(odvp); 1404 1405 if (ap->a_tvp) { 1406 if (ap->a_tvp == ndvp) { 1407 vrele(ap->a_tvp); 1408 } else { 1409 vput(ap->a_tvp); 1410 } 1411 } 1412 1413 vput(ndvp); 1414 return(error); 1415 } 1416 1417 int 1418 coda_mkdir(v) 1419 void *v; 1420 { 1421 /* true args */ 1422 struct vop_mkdir_args *ap = v; 1423 struct vnode *dvp = ap->a_dvp; 1424 struct cnode *dcp = VTOC(dvp); 1425 struct componentname *cnp = ap->a_cnp; 1426 struct vattr *va = ap->a_vap; 1427 struct vnode **vpp = ap->a_vpp; 1428 struct ucred *cred = cnp->cn_cred; 1429 struct proc *p = cnp->cn_proc; 1430 /* locals */ 1431 int error; 1432 const char *nm = cnp->cn_nameptr; 1433 int len = cnp->cn_namelen; 1434 struct cnode *cp; 1435 CodaFid VFid; 1436 struct vattr ova; 1437 1438 MARK_ENTRY(CODA_MKDIR_STATS); 1439 1440 /* Check for mkdir of target object. */ 1441 if (IS_CTL_NAME(dvp, nm, len)) { 1442 *vpp = (struct vnode *)0; 1443 MARK_INT_FAIL(CODA_MKDIR_STATS); 1444 return(EACCES); 1445 } 1446 1447 if (len+1 > CODA_MAXNAMLEN) { 1448 *vpp = (struct vnode *)0; 1449 MARK_INT_FAIL(CODA_MKDIR_STATS); 1450 return(EACCES); 1451 } 1452 1453 error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, p, &VFid, &ova); 1454 1455 if (!error) { 1456 if (coda_find(&VFid) != NULL) 1457 panic("cnode existed for newly created directory!"); 1458 1459 1460 cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); 1461 *vpp = CTOV(cp); 1462 1463 /* enter the new vnode in the Name Cache */ 1464 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1465 1466 /* as a side effect, enter "." and ".." for the directory */ 1467 coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp)); 1468 coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp)); 1469 1470 if (coda_attr_cache) { 1471 VTOC(*vpp)->c_vattr = ova; /* update the attr cache */ 1472 VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */ 1473 } 1474 1475 /* Invalidate the parent's attr cache, the modification time has changed */ 1476 VTOC(dvp)->c_flags &= ~C_VATTR; 1477 1478 CODADEBUG( CODA_MKDIR, myprintf(("mkdir: %s result %d\n", 1479 coda_f2s(&VFid), error)); ) 1480 } else { 1481 *vpp = (struct vnode *)0; 1482 CODADEBUG(CODA_MKDIR, myprintf(("mkdir error %d\n",error));) 1483 } 1484 1485 /* 1486 * Currently, all mkdirs explicitly vput their dvp's. 1487 * It also appears that we *must* lock the vpp, since 1488 * lockleaf isn't set, but someone down the road is going 1489 * to try to unlock the new directory. 1490 */ 1491 vput(dvp); 1492 if (!error) { 1493 if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { 1494 panic("coda_mkdir: couldn't lock child"); 1495 } 1496 } 1497 1498 /* Have to free the previously saved name */ 1499 /* 1500 * ufs_mkdir doesn't check for SAVESTART before freeing the 1501 * pathname buffer, but ufs_create does. For the moment, I'll 1502 * follow their lead, but this seems like it is probably 1503 * incorrect. 1504 */ 1505 PNBUF_PUT(cnp->cn_pnbuf); 1506 return(error); 1507 } 1508 1509 int 1510 coda_rmdir(v) 1511 void *v; 1512 { 1513 /* true args */ 1514 struct vop_rmdir_args *ap = v; 1515 struct vnode *dvp = ap->a_dvp; 1516 struct cnode *dcp = VTOC(dvp); 1517 struct componentname *cnp = ap->a_cnp; 1518 struct ucred *cred = cnp->cn_cred; 1519 struct proc *p = cnp->cn_proc; 1520 /* true args */ 1521 int error; 1522 const char *nm = cnp->cn_nameptr; 1523 int len = cnp->cn_namelen; 1524 struct cnode *cp; 1525 1526 MARK_ENTRY(CODA_RMDIR_STATS); 1527 1528 /* Check for rmdir of control object. */ 1529 if (IS_CTL_NAME(dvp, nm, len)) { 1530 MARK_INT_FAIL(CODA_RMDIR_STATS); 1531 return(ENOENT); 1532 } 1533 1534 /* We're being conservative here, it might be that this person 1535 * doesn't really have sufficient access to delete the file 1536 * but we feel zapping the entry won't really hurt anyone -- dcs 1537 */ 1538 /* 1539 * As a side effect of the rmdir, remove any entries for children of 1540 * the directory, especially "." and "..". 1541 */ 1542 cp = coda_nc_lookup(dcp, nm, len, cred); 1543 if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); 1544 1545 /* Remove the file's entry from the CODA Name Cache */ 1546 coda_nc_zapfile(dcp, nm, len); 1547 1548 /* Invalidate the parent's attr cache, the modification time has changed */ 1549 dcp->c_flags &= ~C_VATTR; 1550 1551 error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, p); 1552 1553 CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); ) 1554 1555 /* 1556 * regardless of what happens, we need to drop locks/refs on the 1557 * parent and child. I think. 1558 */ 1559 if (dvp == ap->a_vp) { 1560 vrele(ap->a_vp); 1561 } else { 1562 vput(ap->a_vp); 1563 } 1564 vput(dvp); 1565 1566 if ((cnp->cn_flags & SAVESTART) == 0) { 1567 PNBUF_PUT(cnp->cn_pnbuf); 1568 } 1569 return(error); 1570 } 1571 1572 int 1573 coda_symlink(v) 1574 void *v; 1575 { 1576 /* true args */ 1577 struct vop_symlink_args *ap = v; 1578 struct vnode *tdvp = ap->a_dvp; 1579 struct cnode *tdcp = VTOC(tdvp); 1580 struct componentname *cnp = ap->a_cnp; 1581 struct vattr *tva = ap->a_vap; 1582 char *path = ap->a_target; 1583 struct ucred *cred = cnp->cn_cred; 1584 struct proc *p = cnp->cn_proc; 1585 /* locals */ 1586 int error; 1587 /* 1588 * XXX I'm assuming the following things about coda_symlink's 1589 * arguments: 1590 * t(foo) is the new name/parent/etc being created. 1591 * lname is the contents of the new symlink. 1592 */ 1593 const char *nm = cnp->cn_nameptr; 1594 int len = cnp->cn_namelen; 1595 int plen = strlen(path); 1596 1597 /* XXX What about the vpp argument? Do we need it? */ 1598 /* 1599 * Here's the strategy for the moment: perform the symlink, then 1600 * do a lookup to grab the resulting vnode. I know this requires 1601 * two communications with Venus for a new sybolic link, but 1602 * that's the way the ball bounces. I don't yet want to change 1603 * the way the Mach symlink works. When Mach support is 1604 * deprecated, we should change symlink so that the common case 1605 * returns the resultant vnode in a vpp argument. 1606 */ 1607 1608 MARK_ENTRY(CODA_SYMLINK_STATS); 1609 1610 /* Check for symlink of control object. */ 1611 if (IS_CTL_NAME(tdvp, nm, len)) { 1612 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1613 return(EACCES); 1614 } 1615 1616 if (plen+1 > CODA_MAXPATHLEN) { 1617 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1618 return(EINVAL); 1619 } 1620 1621 if (len+1 > CODA_MAXNAMLEN) { 1622 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1623 error = EINVAL; 1624 goto exit; 1625 } 1626 1627 error = venus_symlink(vtomi(tdvp), &tdcp->c_fid, path, plen, nm, len, tva, cred, p); 1628 1629 /* Invalidate the parent's attr cache, the modification time has changed */ 1630 tdcp->c_flags &= ~C_VATTR; 1631 1632 if (!error) 1633 { 1634 struct nameidata nd; 1635 NDINIT(&nd, LOOKUP, FOLLOW|LOCKLEAF, UIO_SYSSPACE, nm, p); 1636 nd.ni_cnd.cn_cred = cred; 1637 nd.ni_loopcnt = 0; 1638 nd.ni_startdir = tdvp; 1639 nd.ni_cnd.cn_pnbuf = (char *)nm; 1640 nd.ni_cnd.cn_nameptr = nd.ni_cnd.cn_pnbuf; 1641 nd.ni_pathlen = len; 1642 vput(tdvp); 1643 error = lookup(&nd); 1644 *ap->a_vpp = nd.ni_vp; 1645 } 1646 1647 /* 1648 * Free the name buffer 1649 */ 1650 if ((cnp->cn_flags & SAVESTART) == 0) { 1651 PNBUF_PUT(cnp->cn_pnbuf); 1652 } 1653 1654 exit: 1655 CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); ) 1656 return(error); 1657 } 1658 1659 /* 1660 * Read directory entries. 1661 */ 1662 int 1663 coda_readdir(v) 1664 void *v; 1665 { 1666 /* true args */ 1667 struct vop_readdir_args *ap = v; 1668 struct vnode *vp = ap->a_vp; 1669 struct cnode *cp = VTOC(vp); 1670 struct uio *uiop = ap->a_uio; 1671 struct ucred *cred = ap->a_cred; 1672 int *eofflag = ap->a_eofflag; 1673 off_t **cookies = ap->a_cookies; 1674 int *ncookies = ap->a_ncookies; 1675 struct proc *p = ap->a_uio->uio_procp; 1676 /* upcall decl */ 1677 /* locals */ 1678 int error = 0; 1679 1680 MARK_ENTRY(CODA_READDIR_STATS); 1681 1682 CODADEBUG(CODA_READDIR, myprintf(("coda_readdir(%p, %lu, %lld, %d)\n", uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, (long long) uiop->uio_offset, uiop->uio_segflg)); ) 1683 1684 /* Check for readdir of control object. */ 1685 if (IS_CTL_VP(vp)) { 1686 MARK_INT_FAIL(CODA_READDIR_STATS); 1687 return(ENOENT); 1688 } 1689 1690 { 1691 /* Redirect the request to UFS. */ 1692 1693 /* If directory is not already open do an "internal open" on it. */ 1694 int opened_internally = 0; 1695 if (cp->c_ovp == NULL) { 1696 opened_internally = 1; 1697 MARK_INT_GEN(CODA_OPEN_STATS); 1698 error = VOP_OPEN(vp, FREAD, cred, p); 1699 #ifdef CODA_VERBOSE 1700 printf("coda_readdir: Internally Opening %p\n", vp); 1701 #endif 1702 if (error) return(error); 1703 } 1704 1705 /* Have UFS handle the call. */ 1706 CODADEBUG(CODA_READDIR, myprintf(( 1707 "indirect readdir: fid = %s, refcnt = %d\n", 1708 coda_f2s(&cp->c_fid), vp->v_usecount)); ) 1709 error = VOP_READDIR(cp->c_ovp, uiop, cred, eofflag, cookies, 1710 ncookies); 1711 if (error) 1712 MARK_INT_FAIL(CODA_READDIR_STATS); 1713 else 1714 MARK_INT_SAT(CODA_READDIR_STATS); 1715 1716 /* Do an "internal close" if necessary. */ 1717 if (opened_internally) { 1718 MARK_INT_GEN(CODA_CLOSE_STATS); 1719 (void)VOP_CLOSE(vp, FREAD, cred, p); 1720 } 1721 } 1722 1723 return(error); 1724 } 1725 1726 /* 1727 * Convert from file system blocks to device blocks 1728 */ 1729 int 1730 coda_bmap(v) 1731 void *v; 1732 { 1733 /* XXX on the global proc */ 1734 /* true args */ 1735 struct vop_bmap_args *ap = v; 1736 struct vnode *vp __attribute__((unused)) = ap->a_vp; /* file's vnode */ 1737 daddr_t bn __attribute__((unused)) = ap->a_bn; /* fs block number */ 1738 struct vnode **vpp = ap->a_vpp; /* RETURN vp of device */ 1739 daddr_t *bnp __attribute__((unused)) = ap->a_bnp; /* RETURN device block number */ 1740 struct proc *p __attribute__((unused)) = curproc; 1741 /* upcall decl */ 1742 /* locals */ 1743 1744 *vpp = (struct vnode *)0; 1745 myprintf(("coda_bmap called!\n")); 1746 return(EINVAL); 1747 } 1748 1749 /* 1750 * I don't think the following two things are used anywhere, so I've 1751 * commented them out 1752 * 1753 * struct buf *async_bufhead; 1754 * int async_daemon_count; 1755 */ 1756 int 1757 coda_strategy(v) 1758 void *v; 1759 { 1760 /* true args */ 1761 struct vop_strategy_args *ap = v; 1762 struct buf *bp __attribute__((unused)) = ap->a_bp; 1763 struct proc *p __attribute__((unused)) = curproc; 1764 /* upcall decl */ 1765 /* locals */ 1766 1767 myprintf(("coda_strategy called! ")); 1768 return(EINVAL); 1769 } 1770 1771 int 1772 coda_reclaim(v) 1773 void *v; 1774 { 1775 /* true args */ 1776 struct vop_reclaim_args *ap = v; 1777 struct vnode *vp = ap->a_vp; 1778 struct cnode *cp = VTOC(vp); 1779 /* upcall decl */ 1780 /* locals */ 1781 1782 /* 1783 * Forced unmount/flush will let vnodes with non zero use be destroyed! 1784 */ 1785 ENTRY; 1786 1787 if (IS_UNMOUNTING(cp)) { 1788 #ifdef DEBUG 1789 if (VTOC(vp)->c_ovp) { 1790 if (IS_UNMOUNTING(cp)) 1791 printf("coda_reclaim: c_ovp not void: vp %p, cp %p\n", vp, cp); 1792 } 1793 #endif 1794 } else { 1795 #ifdef OLD_DIAGNOSTIC 1796 if (vp->v_usecount != 0) 1797 print("coda_reclaim: pushing active %p\n", vp); 1798 if (VTOC(vp)->c_ovp) { 1799 panic("coda_reclaim: c_ovp not void"); 1800 } 1801 #endif 1802 } 1803 cache_purge(vp); 1804 coda_free(VTOC(vp)); 1805 SET_VTOC(vp) = NULL; 1806 return (0); 1807 } 1808 1809 int 1810 coda_lock(v) 1811 void *v; 1812 { 1813 /* true args */ 1814 struct vop_lock_args *ap = v; 1815 struct vnode *vp = ap->a_vp; 1816 struct cnode *cp = VTOC(vp); 1817 /* upcall decl */ 1818 /* locals */ 1819 1820 ENTRY; 1821 1822 if (coda_lockdebug) { 1823 myprintf(("Attempting lock on %s\n", 1824 coda_f2s(&cp->c_fid))); 1825 } 1826 1827 return (lockmgr(&vp->v_lock, ap->a_flags, &vp->v_interlock)); 1828 } 1829 1830 int 1831 coda_unlock(v) 1832 void *v; 1833 { 1834 /* true args */ 1835 struct vop_unlock_args *ap = v; 1836 struct vnode *vp = ap->a_vp; 1837 struct cnode *cp = VTOC(vp); 1838 /* upcall decl */ 1839 /* locals */ 1840 1841 ENTRY; 1842 if (coda_lockdebug) { 1843 myprintf(("Attempting unlock on %s\n", 1844 coda_f2s(&cp->c_fid))); 1845 } 1846 1847 return (lockmgr(&vp->v_lock, ap->a_flags | LK_RELEASE, &vp->v_interlock)); 1848 } 1849 1850 int 1851 coda_islocked(v) 1852 void *v; 1853 { 1854 /* true args */ 1855 struct vop_islocked_args *ap = v; 1856 ENTRY; 1857 1858 return (lockstatus(&ap->a_vp->v_lock)); 1859 } 1860 1861 /* How one looks up a vnode given a device/inode pair: */ 1862 int 1863 coda_grab_vnode(dev_t dev, ino_t ino, struct vnode **vpp) 1864 { 1865 /* This is like VFS_VGET() or igetinode()! */ 1866 int error; 1867 struct mount *mp; 1868 1869 if (!(mp = devtomp(dev))) { 1870 myprintf(("coda_grab_vnode: devtomp(%d) returns NULL\n", dev)); 1871 return(ENXIO); 1872 } 1873 1874 /* XXX - ensure that nonzero-return means failure */ 1875 error = VFS_VGET(mp,ino,vpp); 1876 if (error) { 1877 myprintf(("coda_grab_vnode: iget/vget(%d, %d) returns %p, err %d\n", 1878 dev, ino, *vpp, error)); 1879 return(ENOENT); 1880 } 1881 return(0); 1882 } 1883 1884 void 1885 print_vattr( attr ) 1886 struct vattr *attr; 1887 { 1888 char *typestr; 1889 1890 switch (attr->va_type) { 1891 case VNON: 1892 typestr = "VNON"; 1893 break; 1894 case VREG: 1895 typestr = "VREG"; 1896 break; 1897 case VDIR: 1898 typestr = "VDIR"; 1899 break; 1900 case VBLK: 1901 typestr = "VBLK"; 1902 break; 1903 case VCHR: 1904 typestr = "VCHR"; 1905 break; 1906 case VLNK: 1907 typestr = "VLNK"; 1908 break; 1909 case VSOCK: 1910 typestr = "VSCK"; 1911 break; 1912 case VFIFO: 1913 typestr = "VFFO"; 1914 break; 1915 case VBAD: 1916 typestr = "VBAD"; 1917 break; 1918 default: 1919 typestr = "????"; 1920 break; 1921 } 1922 1923 1924 myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n", 1925 typestr, (int)attr->va_mode, (int)attr->va_uid, 1926 (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); 1927 1928 myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n", 1929 (int)attr->va_fileid, (int)attr->va_nlink, 1930 (int)attr->va_size, 1931 (int)attr->va_blocksize,(int)attr->va_bytes)); 1932 myprintf((" gen %ld flags %ld vaflags %d\n", 1933 attr->va_gen, attr->va_flags, attr->va_vaflags)); 1934 myprintf((" atime sec %d nsec %d\n", 1935 (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec)); 1936 myprintf((" mtime sec %d nsec %d\n", 1937 (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec)); 1938 myprintf((" ctime sec %d nsec %d\n", 1939 (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec)); 1940 } 1941 1942 /* How to print a ucred */ 1943 void 1944 print_cred(cred) 1945 struct ucred *cred; 1946 { 1947 1948 int i; 1949 1950 myprintf(("ref %d\tuid %d\n",cred->cr_ref,cred->cr_uid)); 1951 1952 for (i=0; i < cred->cr_ngroups; i++) 1953 myprintf(("\tgroup %d: (%d)\n",i,cred->cr_groups[i])); 1954 myprintf(("\n")); 1955 1956 } 1957 1958 /* 1959 * Return a vnode for the given fid. 1960 * If no cnode exists for this fid create one and put it 1961 * in a table hashed by coda_f2i(). If the cnode for 1962 * this fid is already in the table return it (ref count is 1963 * incremented by coda_find. The cnode will be flushed from the 1964 * table when coda_inactive calls coda_unsave. 1965 */ 1966 struct cnode * 1967 make_coda_node(fid, vfsp, type) 1968 CodaFid *fid; struct mount *vfsp; short type; 1969 { 1970 struct cnode *cp; 1971 int err; 1972 1973 if ((cp = coda_find(fid)) == NULL) { 1974 struct vnode *vp; 1975 1976 cp = coda_alloc(); 1977 cp->c_fid = *fid; 1978 1979 err = getnewvnode(VT_CODA, vfsp, coda_vnodeop_p, &vp); 1980 if (err) { 1981 panic("coda: getnewvnode returned error %d", err); 1982 } 1983 vp->v_data = cp; 1984 vp->v_type = type; 1985 cp->c_vnode = vp; 1986 coda_save(cp); 1987 1988 } else { 1989 vref(CTOV(cp)); 1990 } 1991 1992 return cp; 1993 } 1994 1995 int 1996 coda_getpages(v) 1997 void *v; 1998 { 1999 struct vop_getpages_args /* { 2000 struct vnode *a_vp; 2001 voff_t a_offset; 2002 struct vm_page **a_m; 2003 int *a_count; 2004 int a_centeridx; 2005 vm_prot_t a_access_type; 2006 int a_advice; 2007 int a_flags; 2008 } */ *ap = v; 2009 struct vnode *vp = ap->a_vp; 2010 struct cnode *cp = VTOC(vp); 2011 struct proc *p = curproc; 2012 struct ucred *cred = p->p_ucred; 2013 int error; 2014 2015 /* Check for control object. */ 2016 if (IS_CTL_VP(vp)) { 2017 return(EINVAL); 2018 } 2019 2020 error = VOP_OPEN(vp, FREAD, cred, p); 2021 if (error) { 2022 return error; 2023 } 2024 ap->a_vp = cp->c_ovp; 2025 error = VOCALL(ap->a_vp->v_op, VOFFSET(vop_getpages), ap); 2026 (void) VOP_CLOSE(vp, FREAD, cred, p); 2027 return error; 2028 } 2029 2030 int 2031 coda_putpages(v) 2032 void *v; 2033 { 2034 struct vop_putpages_args /* { 2035 struct vnode *a_vp; 2036 voff_t a_offlo; 2037 voff_t a_offhi; 2038 int a_flags; 2039 } */ *ap = v; 2040 struct vnode *vp = ap->a_vp; 2041 2042 simple_unlock(&vp->v_interlock); 2043 2044 /* Check for control object. */ 2045 if (IS_CTL_VP(vp)) { 2046 return(EINVAL); 2047 } 2048 2049 /* 2050 * XXX 2051 * we'd like to do something useful here for msync(), 2052 * but that turns out to be hard. 2053 */ 2054 2055 return 0; 2056 } 2057
Indexes created Sun Oct 19 02:09:48 GMT 2025