coda_vnops.c revision 1.114.4.1
1 /* $NetBSD: coda_vnops.c,v 1.114.4.1 2021/08/01 22:42:20 thorpej 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_vnops.c,v 1.1.1.1 1998/08/29 21:26:46 rvb Exp $ 32 */ 33 34 /* 35 * Mach Operating System 36 * Copyright (c) 1990 Carnegie-Mellon University 37 * Copyright (c) 1989 Carnegie-Mellon University 38 * All rights reserved. The CMU software License Agreement specifies 39 * the terms and conditions for use and redistribution. 40 */ 41 42 /* 43 * This code was written for the Coda file system at Carnegie Mellon 44 * University. Contributers include David Steere, James Kistler, and 45 * M. Satyanarayanan. 46 */ 47 48 #include <sys/cdefs.h> 49 __KERNEL_RCSID(0, "$NetBSD: coda_vnops.c,v 1.114.4.1 2021/08/01 22:42:20 thorpej Exp $"); 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/malloc.h> 54 #include <sys/errno.h> 55 #include <sys/acct.h> 56 #include <sys/file.h> 57 #include <sys/uio.h> 58 #include <sys/namei.h> 59 #include <sys/ioctl.h> 60 #include <sys/mount.h> 61 #include <sys/proc.h> 62 #include <sys/select.h> 63 #include <sys/vnode.h> 64 #include <sys/kauth.h> 65 #include <sys/dirent.h> 66 67 #include <miscfs/genfs/genfs.h> 68 #include <miscfs/specfs/specdev.h> 69 70 #include <coda/coda.h> 71 #include <coda/cnode.h> 72 #include <coda/coda_vnops.h> 73 #include <coda/coda_venus.h> 74 #include <coda/coda_opstats.h> 75 #include <coda/coda_subr.h> 76 #include <coda/coda_namecache.h> 77 #include <coda/coda_pioctl.h> 78 79 /* 80 * These flags select various performance enhancements. 81 */ 82 int coda_attr_cache = 1; /* Set to cache attributes in the kernel */ 83 int coda_symlink_cache = 1; /* Set to cache symbolic link information */ 84 int coda_access_cache = 1; /* Set to handle some access checks directly */ 85 86 /* structure to keep track of vfs calls */ 87 88 struct coda_op_stats coda_vnodeopstats[CODA_VNODEOPS_SIZE]; 89 90 #define MARK_ENTRY(op) (coda_vnodeopstats[op].entries++) 91 #define MARK_INT_SAT(op) (coda_vnodeopstats[op].sat_intrn++) 92 #define MARK_INT_FAIL(op) (coda_vnodeopstats[op].unsat_intrn++) 93 #define MARK_INT_GEN(op) (coda_vnodeopstats[op].gen_intrn++) 94 95 /* What we are delaying for in printf */ 96 static int coda_lockdebug = 0; 97 98 #define ENTRY if(coda_vnop_print_entry) myprintf(("Entered %s\n",__func__)) 99 100 /* Definition of the vnode operation vector */ 101 102 const struct vnodeopv_entry_desc coda_vnodeop_entries[] = { 103 { &vop_default_desc, coda_vop_error }, 104 { &vop_parsepath_desc, genfs_parsepath }, /* parsepath */ 105 { &vop_lookup_desc, coda_lookup }, /* lookup */ 106 { &vop_create_desc, coda_create }, /* create */ 107 { &vop_mknod_desc, coda_vop_error }, /* mknod */ 108 { &vop_open_desc, coda_open }, /* open */ 109 { &vop_close_desc, coda_close }, /* close */ 110 { &vop_access_desc, coda_access }, /* access */ 111 { &vop_accessx_desc, genfs_accessx }, /* access */ 112 { &vop_getattr_desc, coda_getattr }, /* getattr */ 113 { &vop_setattr_desc, coda_setattr }, /* setattr */ 114 { &vop_read_desc, coda_read }, /* read */ 115 { &vop_write_desc, coda_write }, /* write */ 116 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ 117 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ 118 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 119 { &vop_ioctl_desc, coda_ioctl }, /* ioctl */ 120 { &vop_mmap_desc, genfs_mmap }, /* mmap */ 121 { &vop_fsync_desc, coda_fsync }, /* fsync */ 122 { &vop_remove_desc, coda_remove }, /* remove */ 123 { &vop_link_desc, coda_link }, /* link */ 124 { &vop_rename_desc, coda_rename }, /* rename */ 125 { &vop_mkdir_desc, coda_mkdir }, /* mkdir */ 126 { &vop_rmdir_desc, coda_rmdir }, /* rmdir */ 127 { &vop_symlink_desc, coda_symlink }, /* symlink */ 128 { &vop_readdir_desc, coda_readdir }, /* readdir */ 129 { &vop_readlink_desc, coda_readlink }, /* readlink */ 130 { &vop_abortop_desc, coda_abortop }, /* abortop */ 131 { &vop_inactive_desc, coda_inactive }, /* inactive */ 132 { &vop_reclaim_desc, coda_reclaim }, /* reclaim */ 133 { &vop_lock_desc, coda_lock }, /* lock */ 134 { &vop_unlock_desc, coda_unlock }, /* unlock */ 135 { &vop_bmap_desc, coda_bmap }, /* bmap */ 136 { &vop_strategy_desc, coda_strategy }, /* strategy */ 137 { &vop_print_desc, coda_vop_error }, /* print */ 138 { &vop_islocked_desc, coda_islocked }, /* islocked */ 139 { &vop_pathconf_desc, coda_pathconf }, /* pathconf */ 140 { &vop_advlock_desc, coda_vop_nop }, /* advlock */ 141 { &vop_bwrite_desc, coda_vop_error }, /* bwrite */ 142 { &vop_seek_desc, genfs_seek }, /* seek */ 143 { &vop_poll_desc, genfs_poll }, /* poll */ 144 { &vop_getpages_desc, coda_getpages }, /* getpages */ 145 { &vop_putpages_desc, coda_putpages }, /* putpages */ 146 { NULL, NULL } 147 }; 148 149 static void coda_print_vattr(struct vattr *); 150 151 int (**coda_vnodeop_p)(void *); 152 const struct vnodeopv_desc coda_vnodeop_opv_desc = 153 { &coda_vnodeop_p, coda_vnodeop_entries }; 154 155 /* Definitions of NetBSD vnodeop interfaces */ 156 157 /* 158 * A generic error routine. Return EIO without looking at arguments. 159 */ 160 int 161 coda_vop_error(void *anon) { 162 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 163 164 if (codadebug) { 165 myprintf(("%s: Vnode operation %s called (error).\n", 166 __func__, (*desc)->vdesc_name)); 167 } 168 169 return EIO; 170 } 171 172 /* A generic do-nothing. */ 173 int 174 coda_vop_nop(void *anon) { 175 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; 176 177 if (codadebug) { 178 myprintf(("Vnode operation %s called, but unsupported\n", 179 (*desc)->vdesc_name)); 180 } 181 return (0); 182 } 183 184 int 185 coda_vnodeopstats_init(void) 186 { 187 int i; 188 189 for(i=0;i<CODA_VNODEOPS_SIZE;i++) { 190 coda_vnodeopstats[i].opcode = i; 191 coda_vnodeopstats[i].entries = 0; 192 coda_vnodeopstats[i].sat_intrn = 0; 193 coda_vnodeopstats[i].unsat_intrn = 0; 194 coda_vnodeopstats[i].gen_intrn = 0; 195 } 196 197 return 0; 198 } 199 200 /* 201 * XXX The entire relationship between VOP_OPEN and having a container 202 * file (via venus_open) needs to be reexamined. In particular, it's 203 * valid to open/mmap/close and then reference. Instead of doing 204 * VOP_OPEN when getpages needs a container, we should do the 205 * venus_open part, and record that the vnode has opened the container 206 * for getpages, and do the matching logical close on coda_inactive. 207 * Further, coda_rdwr needs a container file, and sometimes needs to 208 * do the equivalent of open (core dumps). 209 */ 210 /* 211 * coda_open calls Venus to return the device and inode of the 212 * container file, and then obtains a vnode for that file. The 213 * container vnode is stored in the coda vnode, and a reference is 214 * added for each open file. 215 */ 216 int 217 coda_open(void *v) 218 { 219 /* 220 * NetBSD can pass the O_EXCL flag in mode, even though the check 221 * has already happened. Venus defensively assumes that if open 222 * is passed the EXCL, it must be a bug. We strip the flag here. 223 */ 224 /* true args */ 225 struct vop_open_args *ap = v; 226 vnode_t *vp = ap->a_vp; 227 struct cnode *cp = VTOC(vp); 228 int flag = ap->a_mode & (~O_EXCL); 229 kauth_cred_t cred = ap->a_cred; 230 /* locals */ 231 int error; 232 dev_t dev; /* container file device, inode, vnode */ 233 ino_t inode; 234 vnode_t *container_vp; 235 236 MARK_ENTRY(CODA_OPEN_STATS); 237 238 KASSERT(VOP_ISLOCKED(vp)); 239 /* Check for open of control file. */ 240 if (IS_CTL_VP(vp)) { 241 /* if (WRITABLE(flag)) */ 242 if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) { 243 MARK_INT_FAIL(CODA_OPEN_STATS); 244 return(EACCES); 245 } 246 MARK_INT_SAT(CODA_OPEN_STATS); 247 return(0); 248 } 249 250 error = venus_open(vtomi(vp), &cp->c_fid, flag, cred, curlwp, &dev, &inode); 251 if (error) 252 return (error); 253 if (!error) { 254 CODADEBUG(CODA_OPEN, myprintf(( 255 "%s: dev 0x%llx inode %llu result %d\n", __func__, 256 (unsigned long long)dev, (unsigned long long)inode, error));) 257 } 258 259 /* 260 * Obtain locked and referenced container vnode from container 261 * device/inode. 262 */ 263 error = coda_grab_vnode(vp, dev, inode, &container_vp); 264 if (error) 265 return (error); 266 267 /* Save the vnode pointer for the container file. */ 268 if (cp->c_ovp == NULL) { 269 cp->c_ovp = container_vp; 270 } else { 271 if (cp->c_ovp != container_vp) 272 /* 273 * Perhaps venus returned a different container, or 274 * something else went wrong. 275 */ 276 panic("%s: cp->c_ovp != container_vp", __func__); 277 } 278 cp->c_ocount++; 279 280 /* Flush the attribute cache if writing the file. */ 281 if (flag & FWRITE) { 282 cp->c_owrite++; 283 cp->c_flags &= ~C_VATTR; 284 } 285 286 /* 287 * Save the <device, inode> pair for the container file to speed 288 * up subsequent reads while closed (mmap, program execution). 289 * This is perhaps safe because venus will invalidate the node 290 * before changing the container file mapping. 291 */ 292 cp->c_device = dev; 293 cp->c_inode = inode; 294 295 /* Open the container file. */ 296 error = VOP_OPEN(container_vp, flag, cred); 297 /* 298 * Drop the lock on the container, after we have done VOP_OPEN 299 * (which requires a locked vnode). 300 */ 301 VOP_UNLOCK(container_vp); 302 return(error); 303 } 304 305 /* 306 * Close the cache file used for I/O and notify Venus. 307 */ 308 int 309 coda_close(void *v) 310 { 311 /* true args */ 312 struct vop_close_args *ap = v; 313 vnode_t *vp = ap->a_vp; 314 struct cnode *cp = VTOC(vp); 315 int flag = ap->a_fflag; 316 kauth_cred_t cred = ap->a_cred; 317 /* locals */ 318 int error; 319 320 MARK_ENTRY(CODA_CLOSE_STATS); 321 322 /* Check for close of control file. */ 323 if (IS_CTL_VP(vp)) { 324 MARK_INT_SAT(CODA_CLOSE_STATS); 325 return(0); 326 } 327 328 /* 329 * XXX The IS_UNMOUNTING part of this is very suspect. 330 */ 331 if (IS_UNMOUNTING(cp)) { 332 if (cp->c_ovp) { 333 #ifdef CODA_VERBOSE 334 printf("%s: destroying container %d, ufs vp %p of vp %p/cp %p\n", 335 __func__, vrefcnt(vp), cp->c_ovp, vp, cp); 336 #endif 337 #ifdef hmm 338 vgone(cp->c_ovp); 339 #else 340 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 341 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 342 vput(cp->c_ovp); 343 #endif 344 } else { 345 #ifdef CODA_VERBOSE 346 printf("%s: NO container vp %p/cp %p\n", __func__, vp, cp); 347 #endif 348 } 349 return ENODEV; 350 } 351 352 /* Lock the container node, and VOP_CLOSE it. */ 353 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 354 VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ 355 /* 356 * Drop the lock we just obtained, and vrele the container vnode. 357 * Decrement reference counts, and clear container vnode pointer on 358 * last close. 359 */ 360 vput(cp->c_ovp); 361 if (flag & FWRITE) 362 --cp->c_owrite; 363 if (--cp->c_ocount == 0) 364 cp->c_ovp = NULL; 365 366 error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, curlwp); 367 368 CODADEBUG(CODA_CLOSE, myprintf(("%s: result %d\n", __func__, error)); ) 369 return(error); 370 } 371 372 int 373 coda_read(void *v) 374 { 375 struct vop_read_args *ap = v; 376 377 ENTRY; 378 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, 379 ap->a_ioflag, ap->a_cred, curlwp)); 380 } 381 382 int 383 coda_write(void *v) 384 { 385 struct vop_write_args *ap = v; 386 387 ENTRY; 388 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, 389 ap->a_ioflag, ap->a_cred, curlwp)); 390 } 391 392 int 393 coda_rdwr(vnode_t *vp, struct uio *uiop, enum uio_rw rw, int ioflag, 394 kauth_cred_t cred, struct lwp *l) 395 { 396 /* upcall decl */ 397 /* NOTE: container file operation!!! */ 398 /* locals */ 399 struct cnode *cp = VTOC(vp); 400 vnode_t *cfvp = cp->c_ovp; 401 struct proc *p = l->l_proc; 402 int opened_internally = 0; 403 int error = 0; 404 405 MARK_ENTRY(CODA_RDWR_STATS); 406 407 CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld)\n", rw, 408 uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, 409 (long long) uiop->uio_offset)); ) 410 411 /* Check for rdwr of control object. */ 412 if (IS_CTL_VP(vp)) { 413 MARK_INT_FAIL(CODA_RDWR_STATS); 414 return(EINVAL); 415 } 416 417 /* Redirect the request to UFS. */ 418 419 /* 420 * If file is not already open this must be a page 421 * {read,write} request. Iget the cache file's inode 422 * pointer if we still have its <device, inode> pair. 423 * Otherwise, we must do an internal open to derive the 424 * pair. 425 * XXX Integrate this into a coherent strategy for container 426 * file acquisition. 427 */ 428 if (cfvp == NULL) { 429 /* 430 * If we're dumping core, do the internal open. Otherwise 431 * venus won't have the correct size of the core when 432 * it's completely written. 433 */ 434 if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) { 435 #ifdef CODA_VERBOSE 436 printf("%s: grabbing container vnode, losing reference\n", 437 __func__); 438 #endif 439 /* Get locked and refed vnode. */ 440 error = coda_grab_vnode(vp, cp->c_device, cp->c_inode, &cfvp); 441 if (error) { 442 MARK_INT_FAIL(CODA_RDWR_STATS); 443 return(error); 444 } 445 /* 446 * Drop lock. 447 * XXX Where is reference released. 448 */ 449 VOP_UNLOCK(cfvp); 450 } 451 else { 452 #ifdef CODA_VERBOSE 453 printf("%s: internal VOP_OPEN\n", __func__); 454 #endif 455 opened_internally = 1; 456 MARK_INT_GEN(CODA_OPEN_STATS); 457 error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 458 #ifdef CODA_VERBOSE 459 printf("%s: Internally Opening %p\n", __func__, vp); 460 #endif 461 if (error) { 462 MARK_INT_FAIL(CODA_RDWR_STATS); 463 return(error); 464 } 465 cfvp = cp->c_ovp; 466 } 467 } 468 469 /* Have UFS handle the call. */ 470 CODADEBUG(CODA_RDWR, myprintf(("%s: fid = %s, refcnt = %d\n", __func__, 471 coda_f2s(&cp->c_fid), vrefcnt(CTOV(cp)))); ) 472 473 if (rw == UIO_READ) { 474 error = VOP_READ(cfvp, uiop, ioflag, cred); 475 } else { 476 error = VOP_WRITE(cfvp, uiop, ioflag, cred); 477 } 478 479 if (error) 480 MARK_INT_FAIL(CODA_RDWR_STATS); 481 else 482 MARK_INT_SAT(CODA_RDWR_STATS); 483 484 /* Do an internal close if necessary. */ 485 if (opened_internally) { 486 MARK_INT_GEN(CODA_CLOSE_STATS); 487 (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); 488 } 489 490 /* Invalidate cached attributes if writing. */ 491 if (rw == UIO_WRITE) 492 cp->c_flags &= ~C_VATTR; 493 return(error); 494 } 495 496 int 497 coda_ioctl(void *v) 498 { 499 /* true args */ 500 struct vop_ioctl_args *ap = v; 501 vnode_t *vp = ap->a_vp; 502 int com = ap->a_command; 503 void *data = ap->a_data; 504 int flag = ap->a_fflag; 505 kauth_cred_t cred = ap->a_cred; 506 /* locals */ 507 int error; 508 vnode_t *tvp; 509 struct PioctlData *iap = (struct PioctlData *)data; 510 namei_simple_flags_t sflags; 511 512 MARK_ENTRY(CODA_IOCTL_STATS); 513 514 CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));) 515 516 /* Don't check for operation on a dying object, for ctlvp it 517 shouldn't matter */ 518 519 /* Must be control object to succeed. */ 520 if (!IS_CTL_VP(vp)) { 521 MARK_INT_FAIL(CODA_IOCTL_STATS); 522 CODADEBUG(CODA_IOCTL, myprintf(("%s error: vp != ctlvp", __func__));) 523 return (EOPNOTSUPP); 524 } 525 /* Look up the pathname. */ 526 527 /* Should we use the name cache here? It would get it from 528 lookupname sooner or later anyway, right? */ 529 530 sflags = iap->follow ? NSM_FOLLOW_NOEMULROOT : NSM_NOFOLLOW_NOEMULROOT; 531 error = namei_simple_user(iap->path, sflags, &tvp); 532 533 if (error) { 534 MARK_INT_FAIL(CODA_IOCTL_STATS); 535 CODADEBUG(CODA_IOCTL, myprintf(("%s error: lookup returns %d\n", 536 __func__, error));) 537 return(error); 538 } 539 540 /* 541 * Make sure this is a coda style cnode, but it may be a 542 * different vfsp 543 */ 544 /* XXX: this totally violates the comment about vtagtype in vnode.h */ 545 if (tvp->v_tag != VT_CODA) { 546 vrele(tvp); 547 MARK_INT_FAIL(CODA_IOCTL_STATS); 548 CODADEBUG(CODA_IOCTL, myprintf(("%s error: %s not a coda object\n", 549 __func__, iap->path));) 550 return(EINVAL); 551 } 552 553 if (iap->vi.in_size > VC_MAXDATASIZE || iap->vi.out_size > VC_MAXDATASIZE) { 554 vrele(tvp); 555 return(EINVAL); 556 } 557 error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, 558 cred, curlwp); 559 560 if (error) 561 MARK_INT_FAIL(CODA_IOCTL_STATS); 562 else 563 CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); ) 564 565 vrele(tvp); 566 return(error); 567 } 568 569 /* 570 * To reduce the cost of a user-level venus;we cache attributes in 571 * the kernel. Each cnode has storage allocated for an attribute. If 572 * c_vattr is valid, return a reference to it. Otherwise, get the 573 * attributes from venus and store them in the cnode. There is some 574 * question if this method is a security leak. But I think that in 575 * order to make this call, the user must have done a lookup and 576 * opened the file, and therefore should already have access. 577 */ 578 int 579 coda_getattr(void *v) 580 { 581 /* true args */ 582 struct vop_getattr_args *ap = v; 583 vnode_t *vp = ap->a_vp; 584 struct cnode *cp = VTOC(vp); 585 struct vattr *vap = ap->a_vap; 586 kauth_cred_t cred = ap->a_cred; 587 /* locals */ 588 int error; 589 590 MARK_ENTRY(CODA_GETATTR_STATS); 591 592 /* Check for getattr of control object. */ 593 if (IS_CTL_VP(vp)) { 594 MARK_INT_FAIL(CODA_GETATTR_STATS); 595 return(ENOENT); 596 } 597 598 /* Check to see if the attributes have already been cached */ 599 if (VALID_VATTR(cp)) { 600 CODADEBUG(CODA_GETATTR, { myprintf(("%s: attr cache hit: %s\n", 601 __func__, coda_f2s(&cp->c_fid)));}) 602 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 603 coda_print_vattr(&cp->c_vattr); ) 604 605 *vap = cp->c_vattr; 606 MARK_INT_SAT(CODA_GETATTR_STATS); 607 return(0); 608 } 609 610 error = venus_getattr(vtomi(vp), &cp->c_fid, cred, curlwp, vap); 611 612 if (!error) { 613 CODADEBUG(CODA_GETATTR, myprintf(("%s miss %s: result %d\n", 614 __func__, coda_f2s(&cp->c_fid), error)); ) 615 616 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 617 coda_print_vattr(vap); ) 618 619 /* If not open for write, store attributes in cnode */ 620 if ((cp->c_owrite == 0) && (coda_attr_cache)) { 621 cp->c_vattr = *vap; 622 cp->c_flags |= C_VATTR; 623 } 624 625 } 626 return(error); 627 } 628 629 int 630 coda_setattr(void *v) 631 { 632 /* true args */ 633 struct vop_setattr_args *ap = v; 634 vnode_t *vp = ap->a_vp; 635 struct cnode *cp = VTOC(vp); 636 struct vattr *vap = ap->a_vap; 637 kauth_cred_t cred = ap->a_cred; 638 /* locals */ 639 int error; 640 641 MARK_ENTRY(CODA_SETATTR_STATS); 642 643 /* Check for setattr of control object. */ 644 if (IS_CTL_VP(vp)) { 645 MARK_INT_FAIL(CODA_SETATTR_STATS); 646 return(ENOENT); 647 } 648 649 if (codadebug & CODADBGMSK(CODA_SETATTR)) { 650 coda_print_vattr(vap); 651 } 652 error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, curlwp); 653 654 if (!error) 655 cp->c_flags &= ~C_VATTR; 656 657 CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); ) 658 return(error); 659 } 660 661 int 662 coda_access(void *v) 663 { 664 /* true args */ 665 struct vop_access_args *ap = v; 666 vnode_t *vp = ap->a_vp; 667 struct cnode *cp = VTOC(vp); 668 accmode_t accmode = ap->a_accmode; 669 kauth_cred_t cred = ap->a_cred; 670 /* locals */ 671 int error; 672 673 MARK_ENTRY(CODA_ACCESS_STATS); 674 675 KASSERT((accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | VAPPEND)) == 0); 676 /* Check for access of control object. Only read access is 677 allowed on it. */ 678 if (IS_CTL_VP(vp)) { 679 /* bogus hack - all will be marked as successes */ 680 MARK_INT_SAT(CODA_ACCESS_STATS); 681 return(((accmode & VREAD) && !(accmode & (VWRITE | VEXEC))) 682 ? 0 : EACCES); 683 } 684 685 /* 686 * if the file is a directory, and we are checking exec (eg lookup) 687 * access, and the file is in the namecache, then the user must have 688 * lookup access to it. 689 */ 690 if (coda_access_cache) { 691 if ((vp->v_type == VDIR) && (accmode & VEXEC)) { 692 if (coda_nc_lookup(cp, ".", 1, cred)) { 693 MARK_INT_SAT(CODA_ACCESS_STATS); 694 return(0); /* it was in the cache */ 695 } 696 } 697 } 698 699 error = venus_access(vtomi(vp), &cp->c_fid, accmode, cred, curlwp); 700 701 return(error); 702 } 703 704 /* 705 * CODA abort op, called after namei() when a CREATE/DELETE isn't actually 706 * done. If a buffer has been saved in anticipation of a coda_create or 707 * a coda_remove, delete it. 708 */ 709 /* ARGSUSED */ 710 int 711 coda_abortop(void *v) 712 { 713 /* true args */ 714 struct vop_abortop_args /* { 715 vnode_t *a_dvp; 716 struct componentname *a_cnp; 717 } */ *ap = v; 718 719 (void)ap; 720 /* upcall decl */ 721 /* locals */ 722 723 return (0); 724 } 725 726 int 727 coda_readlink(void *v) 728 { 729 /* true args */ 730 struct vop_readlink_args *ap = v; 731 vnode_t *vp = ap->a_vp; 732 struct cnode *cp = VTOC(vp); 733 struct uio *uiop = ap->a_uio; 734 kauth_cred_t cred = ap->a_cred; 735 /* locals */ 736 struct lwp *l = curlwp; 737 int error; 738 char *str; 739 int len; 740 741 MARK_ENTRY(CODA_READLINK_STATS); 742 743 /* Check for readlink of control object. */ 744 if (IS_CTL_VP(vp)) { 745 MARK_INT_FAIL(CODA_READLINK_STATS); 746 return(ENOENT); 747 } 748 749 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */ 750 uiop->uio_rw = UIO_READ; 751 error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop); 752 if (error) 753 MARK_INT_FAIL(CODA_READLINK_STATS); 754 else 755 MARK_INT_SAT(CODA_READLINK_STATS); 756 return(error); 757 } 758 759 error = venus_readlink(vtomi(vp), &cp->c_fid, cred, l, &str, &len); 760 761 if (!error) { 762 uiop->uio_rw = UIO_READ; 763 error = uiomove(str, len, uiop); 764 765 if (coda_symlink_cache) { 766 cp->c_symlink = str; 767 cp->c_symlen = len; 768 cp->c_flags |= C_SYMLINK; 769 } else 770 CODA_FREE(str, len); 771 } 772 773 CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));) 774 return(error); 775 } 776 777 int 778 coda_fsync(void *v) 779 { 780 /* true args */ 781 struct vop_fsync_args *ap = v; 782 vnode_t *vp = ap->a_vp; 783 struct cnode *cp = VTOC(vp); 784 kauth_cred_t cred = ap->a_cred; 785 /* locals */ 786 vnode_t *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 its 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 or unitialized cnode. */ 801 if (IS_CTL_VP(vp) || vp->v_type == VNON) { 802 MARK_INT_SAT(CODA_FSYNC_STATS); 803 return(0); 804 } 805 806 if (convp) 807 VOP_FSYNC(convp, cred, MNT_WAIT, 0, 0); 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, curlwp); 821 822 CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); ) 823 return(error); 824 } 825 826 /* 827 * vp is locked on entry, and we must unlock it. 828 * XXX This routine is suspect and probably needs rewriting. 829 */ 830 int 831 coda_inactive(void *v) 832 { 833 /* true args */ 834 struct vop_inactive_v2_args *ap = v; 835 vnode_t *vp = ap->a_vp; 836 struct cnode *cp = VTOC(vp); 837 kauth_cred_t cred __unused = NULL; 838 839 /* We don't need to send inactive to venus - DCS */ 840 MARK_ENTRY(CODA_INACTIVE_STATS); 841 842 if (IS_CTL_VP(vp)) { 843 MARK_INT_SAT(CODA_INACTIVE_STATS); 844 return 0; 845 } 846 847 CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n", 848 coda_f2s(&cp->c_fid), vp->v_mount));) 849 850 if (vp->v_mount->mnt_data == NULL) { 851 myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n", vp)); 852 panic("badness in coda_inactive"); 853 } 854 855 #ifdef CODA_VERBOSE 856 /* Sanity checks that perhaps should be panic. */ 857 if (vrefcnt(vp) > 1) 858 printf("%s: %p usecount %d\n", __func__, vp, vrefcnt(vp)); 859 if (cp->c_ovp != NULL) 860 printf("%s: %p ovp != NULL\n", __func__, vp); 861 #endif 862 /* XXX Do we need to VOP_CLOSE container vnodes? */ 863 if (!IS_UNMOUNTING(cp)) 864 *ap->a_recycle = true; 865 866 MARK_INT_SAT(CODA_INACTIVE_STATS); 867 return(0); 868 } 869 870 /* 871 * Coda does not use the normal namecache, but a private version. 872 * Consider how to use the standard facility instead. 873 */ 874 int 875 coda_lookup(void *v) 876 { 877 /* true args */ 878 struct vop_lookup_v2_args *ap = v; 879 /* (locked) vnode of dir in which to do lookup */ 880 vnode_t *dvp = ap->a_dvp; 881 struct cnode *dcp = VTOC(dvp); 882 /* output variable for result */ 883 vnode_t **vpp = ap->a_vpp; 884 /* name to lookup */ 885 struct componentname *cnp = ap->a_cnp; 886 kauth_cred_t cred = cnp->cn_cred; 887 struct lwp *l = curlwp; 888 /* locals */ 889 struct cnode *cp; 890 const char *nm = cnp->cn_nameptr; 891 int len = cnp->cn_namelen; 892 CodaFid VFid; 893 int vtype; 894 int error = 0; 895 896 MARK_ENTRY(CODA_LOOKUP_STATS); 897 898 CODADEBUG(CODA_LOOKUP, myprintf(("%s: %s in %s\n", __func__, 899 nm, coda_f2s(&dcp->c_fid)));) 900 901 /* 902 * XXX componentname flags in MODMASK are not handled at all 903 */ 904 905 /* 906 * The overall strategy is to switch on the lookup type and get a 907 * result vnode that is vref'd but not locked. 908 */ 909 910 /* Check for lookup of control object. */ 911 if (IS_CTL_NAME(dvp, nm, len)) { 912 *vpp = coda_ctlvp; 913 vref(*vpp); 914 MARK_INT_SAT(CODA_LOOKUP_STATS); 915 goto exit; 916 } 917 918 /* Avoid trying to hand venus an unreasonably long name. */ 919 if (len+1 > CODA_MAXNAMLEN) { 920 MARK_INT_FAIL(CODA_LOOKUP_STATS); 921 CODADEBUG(CODA_LOOKUP, myprintf(("%s: name too long:, %s (%s)\n", 922 __func__, coda_f2s(&dcp->c_fid), nm));) 923 *vpp = (vnode_t *)0; 924 error = EINVAL; 925 goto exit; 926 } 927 928 /* 929 * Try to resolve the lookup in the minicache. If that fails, ask 930 * venus to do the lookup. XXX The interaction between vnode 931 * locking and any locking that coda does is not clear. 932 */ 933 cp = coda_nc_lookup(dcp, nm, len, cred); 934 if (cp) { 935 *vpp = CTOV(cp); 936 vref(*vpp); 937 CODADEBUG(CODA_LOOKUP, 938 myprintf(("lookup result %d vpp %p\n",error,*vpp));) 939 } else { 940 /* The name wasn't cached, so ask Venus. */ 941 error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, l, &VFid, 942 &vtype); 943 944 if (error) { 945 MARK_INT_FAIL(CODA_LOOKUP_STATS); 946 CODADEBUG(CODA_LOOKUP, myprintf(("%s: lookup error on %s (%s)%d\n", 947 __func__, coda_f2s(&dcp->c_fid), nm, error));) 948 *vpp = (vnode_t *)0; 949 } else { 950 MARK_INT_SAT(CODA_LOOKUP_STATS); 951 CODADEBUG(CODA_LOOKUP, myprintf(("%s: %s type %o result %d\n", 952 __func__, coda_f2s(&VFid), vtype, error)); ) 953 954 cp = make_coda_node(&VFid, dvp->v_mount, vtype); 955 *vpp = CTOV(cp); 956 /* vpp is now vrefed. */ 957 958 /* 959 * Unless this vnode is marked CODA_NOCACHE, enter it into 960 * the coda name cache to avoid a future venus round-trip. 961 * XXX Interaction with componentname NOCACHE is unclear. 962 */ 963 if (!(vtype & CODA_NOCACHE)) 964 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 965 } 966 } 967 968 exit: 969 /* 970 * If we are creating, and this was the last name to be looked up, 971 * and the error was ENOENT, then make the leaf NULL and return 972 * success. 973 * XXX Check against new lookup rules. 974 */ 975 if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) 976 && (cnp->cn_flags & ISLASTCN) 977 && (error == ENOENT)) 978 { 979 error = EJUSTRETURN; 980 *ap->a_vpp = NULL; 981 } 982 983 return(error); 984 } 985 986 /*ARGSUSED*/ 987 int 988 coda_create(void *v) 989 { 990 /* true args */ 991 struct vop_create_v3_args *ap = v; 992 vnode_t *dvp = ap->a_dvp; 993 struct cnode *dcp = VTOC(dvp); 994 struct vattr *va = ap->a_vap; 995 int exclusive = 1; 996 int mode = ap->a_vap->va_mode; 997 vnode_t **vpp = ap->a_vpp; 998 struct componentname *cnp = ap->a_cnp; 999 kauth_cred_t cred = cnp->cn_cred; 1000 struct lwp *l = curlwp; 1001 /* locals */ 1002 int error; 1003 struct cnode *cp; 1004 const char *nm = cnp->cn_nameptr; 1005 int len = cnp->cn_namelen; 1006 CodaFid VFid; 1007 struct vattr attr; 1008 1009 MARK_ENTRY(CODA_CREATE_STATS); 1010 1011 /* All creates are exclusive XXX */ 1012 /* I'm assuming the 'mode' argument is the file mode bits XXX */ 1013 1014 /* Check for create of control object. */ 1015 if (IS_CTL_NAME(dvp, nm, len)) { 1016 *vpp = (vnode_t *)0; 1017 MARK_INT_FAIL(CODA_CREATE_STATS); 1018 return(EACCES); 1019 } 1020 1021 error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, l, &VFid, &attr); 1022 1023 if (!error) { 1024 1025 /* 1026 * XXX Violation of venus/kernel invariants is a difficult case, 1027 * but venus should not be able to cause a panic. 1028 */ 1029 /* If this is an exclusive create, panic if the file already exists. */ 1030 /* Venus should have detected the file and reported EEXIST. */ 1031 1032 if ((exclusive == 1) && 1033 (coda_find(&VFid) != NULL)) 1034 panic("cnode existed for newly created file!"); 1035 1036 cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); 1037 *vpp = CTOV(cp); 1038 1039 /* XXX vnodeops doesn't say this argument can be changed. */ 1040 /* Update va to reflect the new attributes. */ 1041 (*va) = attr; 1042 1043 /* Update the attribute cache and mark it as valid */ 1044 if (coda_attr_cache) { 1045 VTOC(*vpp)->c_vattr = attr; 1046 VTOC(*vpp)->c_flags |= C_VATTR; 1047 } 1048 1049 /* Invalidate parent's attr cache (modification time has changed). */ 1050 VTOC(dvp)->c_flags &= ~C_VATTR; 1051 1052 /* enter the new vnode in the Name Cache */ 1053 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1054 1055 CODADEBUG(CODA_CREATE, myprintf(("%s: %s, result %d\n", __func__, 1056 coda_f2s(&VFid), error)); ) 1057 } else { 1058 *vpp = (vnode_t *)0; 1059 CODADEBUG(CODA_CREATE, myprintf(("%s: create error %d\n", __func__, 1060 error));) 1061 } 1062 1063 if (!error) { 1064 #ifdef CODA_VERBOSE 1065 if ((cnp->cn_flags & LOCKLEAF) == 0) 1066 /* This should not happen; flags are for lookup only. */ 1067 printf("%s: LOCKLEAF not set!\n", __func__); 1068 #endif 1069 } 1070 1071 return(error); 1072 } 1073 1074 int 1075 coda_remove(void *v) 1076 { 1077 /* true args */ 1078 struct vop_remove_v2_args *ap = v; 1079 vnode_t *dvp = ap->a_dvp; 1080 struct cnode *cp = VTOC(dvp); 1081 vnode_t *vp = ap->a_vp; 1082 struct componentname *cnp = ap->a_cnp; 1083 kauth_cred_t cred = cnp->cn_cred; 1084 struct lwp *l = curlwp; 1085 /* locals */ 1086 int error; 1087 const char *nm = cnp->cn_nameptr; 1088 int len = cnp->cn_namelen; 1089 struct cnode *tp; 1090 1091 MARK_ENTRY(CODA_REMOVE_STATS); 1092 1093 CODADEBUG(CODA_REMOVE, myprintf(("%s: %s in %s\n", __func__, 1094 nm, coda_f2s(&cp->c_fid)));) 1095 1096 /* Remove the file's entry from the CODA Name Cache */ 1097 /* We're being conservative here, it might be that this person 1098 * doesn't really have sufficient access to delete the file 1099 * but we feel zapping the entry won't really hurt anyone -- dcs 1100 */ 1101 /* I'm gonna go out on a limb here. If a file and a hardlink to it 1102 * exist, and one is removed, the link count on the other will be 1103 * off by 1. We could either invalidate the attrs if cached, or 1104 * fix them. I'll try to fix them. DCS 11/8/94 1105 */ 1106 tp = coda_nc_lookup(VTOC(dvp), nm, len, cred); 1107 if (tp) { 1108 if (VALID_VATTR(tp)) { /* If attrs are cached */ 1109 if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */ 1110 tp->c_vattr.va_nlink--; 1111 } 1112 } 1113 1114 coda_nc_zapfile(VTOC(dvp), nm, len); 1115 /* No need to flush it if it doesn't exist! */ 1116 } 1117 /* Invalidate the parent's attr cache, the modification time has changed */ 1118 VTOC(dvp)->c_flags &= ~C_VATTR; 1119 1120 /* Check for remove of control object. */ 1121 if (IS_CTL_NAME(dvp, nm, len)) { 1122 MARK_INT_FAIL(CODA_REMOVE_STATS); 1123 return(ENOENT); 1124 } 1125 1126 error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, l); 1127 1128 CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); ) 1129 1130 /* 1131 * Unlock and release child (avoiding double if "."). 1132 */ 1133 if (dvp == vp) { 1134 vrele(vp); 1135 } else { 1136 vput(vp); 1137 } 1138 1139 return(error); 1140 } 1141 1142 /* 1143 * dvp is the directory where the link is to go, and is locked. 1144 * vp is the object to be linked to, and is unlocked. 1145 * At exit, we must unlock dvp, and vput dvp. 1146 */ 1147 int 1148 coda_link(void *v) 1149 { 1150 /* true args */ 1151 struct vop_link_v2_args *ap = v; 1152 vnode_t *vp = ap->a_vp; 1153 struct cnode *cp = VTOC(vp); 1154 vnode_t *dvp = ap->a_dvp; 1155 struct cnode *dcp = VTOC(dvp); 1156 struct componentname *cnp = ap->a_cnp; 1157 kauth_cred_t cred = cnp->cn_cred; 1158 struct lwp *l = curlwp; 1159 /* locals */ 1160 int error; 1161 const char *nm = cnp->cn_nameptr; 1162 int len = cnp->cn_namelen; 1163 1164 MARK_ENTRY(CODA_LINK_STATS); 1165 1166 if (codadebug & CODADBGMSK(CODA_LINK)) { 1167 1168 myprintf(("%s: vp fid: %s\n", __func__, coda_f2s(&cp->c_fid))); 1169 myprintf(("%s: dvp fid: %s)\n", __func__, coda_f2s(&dcp->c_fid))); 1170 1171 } 1172 if (codadebug & CODADBGMSK(CODA_LINK)) { 1173 myprintf(("%s: vp fid: %s\n", __func__, coda_f2s(&cp->c_fid))); 1174 myprintf(("%s: dvp fid: %s\n", __func__, coda_f2s(&dcp->c_fid))); 1175 1176 } 1177 1178 /* Check for link to/from control object. */ 1179 if (IS_CTL_NAME(dvp, nm, len) || IS_CTL_VP(vp)) { 1180 MARK_INT_FAIL(CODA_LINK_STATS); 1181 return(EACCES); 1182 } 1183 1184 /* If linking . to a name, error out earlier. */ 1185 if (vp == dvp) { 1186 #ifdef CODA_VERBOSE 1187 printf("%s coda_link vp==dvp\n", __func__); 1188 #endif 1189 error = EISDIR; 1190 goto exit; 1191 } 1192 1193 /* XXX Why does venus_link need the vnode to be locked?*/ 1194 if ((error = vn_lock(vp, LK_EXCLUSIVE)) != 0) { 1195 #ifdef CODA_VERBOSE 1196 printf("%s: couldn't lock vnode %p\n", __func__, vp); 1197 #endif 1198 error = EFAULT; /* XXX better value */ 1199 goto exit; 1200 } 1201 error = venus_link(vtomi(vp), &cp->c_fid, &dcp->c_fid, nm, len, cred, l); 1202 VOP_UNLOCK(vp); 1203 1204 /* Invalidate parent's attr cache (the modification time has changed). */ 1205 VTOC(dvp)->c_flags &= ~C_VATTR; 1206 /* Invalidate child's attr cache (XXX why). */ 1207 VTOC(vp)->c_flags &= ~C_VATTR; 1208 1209 CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); ) 1210 1211 exit: 1212 return(error); 1213 } 1214 1215 int 1216 coda_rename(void *v) 1217 { 1218 /* true args */ 1219 struct vop_rename_args *ap = v; 1220 vnode_t *odvp = ap->a_fdvp; 1221 struct cnode *odcp = VTOC(odvp); 1222 struct componentname *fcnp = ap->a_fcnp; 1223 vnode_t *ndvp = ap->a_tdvp; 1224 struct cnode *ndcp = VTOC(ndvp); 1225 struct componentname *tcnp = ap->a_tcnp; 1226 kauth_cred_t cred = fcnp->cn_cred; 1227 struct lwp *l = curlwp; 1228 /* true args */ 1229 int error; 1230 const char *fnm = fcnp->cn_nameptr; 1231 int flen = fcnp->cn_namelen; 1232 const char *tnm = tcnp->cn_nameptr; 1233 int tlen = tcnp->cn_namelen; 1234 1235 MARK_ENTRY(CODA_RENAME_STATS); 1236 1237 /* Hmmm. The vnodes are already looked up. Perhaps they are locked? 1238 This could be Bad. XXX */ 1239 #ifdef OLD_DIAGNOSTIC 1240 if ((fcnp->cn_cred != tcnp->cn_cred) 1241 || (fcnp->cn_lwp != tcnp->cn_lwp)) 1242 { 1243 panic("%s: component names don't agree", __func__); 1244 } 1245 #endif 1246 1247 /* Check for rename involving control object. */ 1248 if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { 1249 MARK_INT_FAIL(CODA_RENAME_STATS); 1250 return(EACCES); 1251 } 1252 1253 /* Problem with moving directories -- need to flush entry for .. */ 1254 if (odvp != ndvp) { 1255 struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred); 1256 if (ovcp) { 1257 vnode_t *ovp = CTOV(ovcp); 1258 if ((ovp) && 1259 (ovp->v_type == VDIR)) /* If it's a directory */ 1260 coda_nc_zapfile(VTOC(ovp),"..", 2); 1261 } 1262 } 1263 1264 /* Remove the entries for both source and target files */ 1265 coda_nc_zapfile(VTOC(odvp), fnm, flen); 1266 coda_nc_zapfile(VTOC(ndvp), tnm, tlen); 1267 1268 /* Invalidate the parent's attr cache, the modification time has changed */ 1269 VTOC(odvp)->c_flags &= ~C_VATTR; 1270 VTOC(ndvp)->c_flags &= ~C_VATTR; 1271 1272 if (flen+1 > CODA_MAXNAMLEN) { 1273 MARK_INT_FAIL(CODA_RENAME_STATS); 1274 error = EINVAL; 1275 goto exit; 1276 } 1277 1278 if (tlen+1 > CODA_MAXNAMLEN) { 1279 MARK_INT_FAIL(CODA_RENAME_STATS); 1280 error = EINVAL; 1281 goto exit; 1282 } 1283 1284 error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, l); 1285 1286 exit: 1287 CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));) 1288 /* XXX - do we need to call cache pureg on the moved vnode? */ 1289 cache_purge(ap->a_fvp); 1290 1291 /* It seems to be incumbent on us to drop locks on all four vnodes */ 1292 /* From-vnodes are not locked, only ref'd. To-vnodes are locked. */ 1293 1294 vrele(ap->a_fvp); 1295 vrele(odvp); 1296 1297 if (ap->a_tvp) { 1298 if (ap->a_tvp == ndvp) { 1299 vrele(ap->a_tvp); 1300 } else { 1301 vput(ap->a_tvp); 1302 } 1303 } 1304 1305 vput(ndvp); 1306 return(error); 1307 } 1308 1309 int 1310 coda_mkdir(void *v) 1311 { 1312 /* true args */ 1313 struct vop_mkdir_v3_args *ap = v; 1314 vnode_t *dvp = ap->a_dvp; 1315 struct cnode *dcp = VTOC(dvp); 1316 struct componentname *cnp = ap->a_cnp; 1317 struct vattr *va = ap->a_vap; 1318 vnode_t **vpp = ap->a_vpp; 1319 kauth_cred_t cred = cnp->cn_cred; 1320 struct lwp *l = curlwp; 1321 /* locals */ 1322 int error; 1323 const char *nm = cnp->cn_nameptr; 1324 int len = cnp->cn_namelen; 1325 struct cnode *cp; 1326 CodaFid VFid; 1327 struct vattr ova; 1328 1329 MARK_ENTRY(CODA_MKDIR_STATS); 1330 1331 /* Check for mkdir of target object. */ 1332 if (IS_CTL_NAME(dvp, nm, len)) { 1333 *vpp = (vnode_t *)0; 1334 MARK_INT_FAIL(CODA_MKDIR_STATS); 1335 return(EACCES); 1336 } 1337 1338 if (len+1 > CODA_MAXNAMLEN) { 1339 *vpp = (vnode_t *)0; 1340 MARK_INT_FAIL(CODA_MKDIR_STATS); 1341 return(EACCES); 1342 } 1343 1344 error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, l, &VFid, &ova); 1345 1346 if (!error) { 1347 if (coda_find(&VFid) != NULL) 1348 panic("cnode existed for newly created directory!"); 1349 1350 1351 cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); 1352 *vpp = CTOV(cp); 1353 1354 /* enter the new vnode in the Name Cache */ 1355 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); 1356 1357 /* as a side effect, enter "." and ".." for the directory */ 1358 coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp)); 1359 coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp)); 1360 1361 if (coda_attr_cache) { 1362 VTOC(*vpp)->c_vattr = ova; /* update the attr cache */ 1363 VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */ 1364 } 1365 1366 /* Invalidate the parent's attr cache, the modification time has changed */ 1367 VTOC(dvp)->c_flags &= ~C_VATTR; 1368 1369 CODADEBUG( CODA_MKDIR, myprintf(("%s: %s result %d\n", __func__, 1370 coda_f2s(&VFid), error)); ) 1371 } else { 1372 *vpp = (vnode_t *)0; 1373 CODADEBUG(CODA_MKDIR, myprintf(("%s error %d\n", __func__, error));) 1374 } 1375 1376 return(error); 1377 } 1378 1379 int 1380 coda_rmdir(void *v) 1381 { 1382 /* true args */ 1383 struct vop_rmdir_v2_args *ap = v; 1384 vnode_t *dvp = ap->a_dvp; 1385 struct cnode *dcp = VTOC(dvp); 1386 vnode_t *vp = ap->a_vp; 1387 struct componentname *cnp = ap->a_cnp; 1388 kauth_cred_t cred = cnp->cn_cred; 1389 struct lwp *l = curlwp; 1390 /* true args */ 1391 int error; 1392 const char *nm = cnp->cn_nameptr; 1393 int len = cnp->cn_namelen; 1394 struct cnode *cp; 1395 1396 MARK_ENTRY(CODA_RMDIR_STATS); 1397 1398 /* Check for rmdir of control object. */ 1399 if (IS_CTL_NAME(dvp, nm, len)) { 1400 MARK_INT_FAIL(CODA_RMDIR_STATS); 1401 return(ENOENT); 1402 } 1403 1404 /* Can't remove . in self. */ 1405 if (dvp == vp) { 1406 #ifdef CODA_VERBOSE 1407 printf("%s: dvp == vp\n", __func__); 1408 #endif 1409 error = EINVAL; 1410 goto exit; 1411 } 1412 1413 /* 1414 * The caller may not have adequate permissions, and the venus 1415 * operation may fail, but it doesn't hurt from a correctness 1416 * viewpoint to invalidate cache entries. 1417 * XXX Why isn't this done after the venus_rmdir call? 1418 */ 1419 /* Look up child in name cache (by name, from parent). */ 1420 cp = coda_nc_lookup(dcp, nm, len, cred); 1421 /* If found, remove all children of the child (., ..). */ 1422 if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); 1423 1424 /* Remove child's own entry. */ 1425 coda_nc_zapfile(dcp, nm, len); 1426 1427 /* Invalidate parent's attr cache (the modification time has changed). */ 1428 dcp->c_flags &= ~C_VATTR; 1429 1430 error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, l); 1431 1432 CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); ) 1433 1434 exit: 1435 /* unlock and release child */ 1436 if (dvp == vp) { 1437 vrele(vp); 1438 } else { 1439 vput(vp); 1440 } 1441 1442 return(error); 1443 } 1444 1445 int 1446 coda_symlink(void *v) 1447 { 1448 /* true args */ 1449 struct vop_symlink_v3_args *ap = v; 1450 vnode_t *dvp = ap->a_dvp; 1451 struct cnode *dcp = VTOC(dvp); 1452 /* a_vpp is used in place below */ 1453 struct componentname *cnp = ap->a_cnp; 1454 struct vattr *tva = ap->a_vap; 1455 char *path = ap->a_target; 1456 kauth_cred_t cred = cnp->cn_cred; 1457 struct lwp *l = curlwp; 1458 /* locals */ 1459 int error; 1460 u_long saved_cn_flags; 1461 const char *nm = cnp->cn_nameptr; 1462 int len = cnp->cn_namelen; 1463 int plen = strlen(path); 1464 1465 /* 1466 * Here's the strategy for the moment: perform the symlink, then 1467 * do a lookup to grab the resulting vnode. I know this requires 1468 * two communications with Venus for a new sybolic link, but 1469 * that's the way the ball bounces. I don't yet want to change 1470 * the way the Mach symlink works. When Mach support is 1471 * deprecated, we should change symlink so that the common case 1472 * returns the resultant vnode in a vpp argument. 1473 */ 1474 1475 MARK_ENTRY(CODA_SYMLINK_STATS); 1476 1477 /* Check for symlink of control object. */ 1478 if (IS_CTL_NAME(dvp, nm, len)) { 1479 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1480 error = EACCES; 1481 goto exit; 1482 } 1483 1484 if (plen+1 > CODA_MAXPATHLEN) { 1485 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1486 error = EINVAL; 1487 goto exit; 1488 } 1489 1490 if (len+1 > CODA_MAXNAMLEN) { 1491 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1492 error = EINVAL; 1493 goto exit; 1494 } 1495 1496 error = venus_symlink(vtomi(dvp), &dcp->c_fid, path, plen, nm, len, tva, cred, l); 1497 1498 /* Invalidate the parent's attr cache (modification time has changed). */ 1499 dcp->c_flags &= ~C_VATTR; 1500 1501 if (!error) { 1502 /* 1503 * VOP_SYMLINK is not defined to pay attention to cnp->cn_flags; 1504 * these are defined only for VOP_LOOKUP. We desire to reuse 1505 * cnp for a VOP_LOOKUP operation, and must be sure to not pass 1506 * stray flags passed to us. Such stray flags can occur because 1507 * sys_symlink makes a namei call and then reuses the 1508 * componentname structure. 1509 */ 1510 /* 1511 * XXX Arguably we should create our own componentname structure 1512 * and not reuse the one that was passed in. 1513 */ 1514 saved_cn_flags = cnp->cn_flags; 1515 cnp->cn_flags &= ~(MODMASK | OPMASK); 1516 cnp->cn_flags |= LOOKUP; 1517 error = VOP_LOOKUP(dvp, ap->a_vpp, cnp); 1518 cnp->cn_flags = saved_cn_flags; 1519 } 1520 1521 exit: 1522 CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); ) 1523 return(error); 1524 } 1525 1526 /* 1527 * Read directory entries. 1528 */ 1529 int 1530 coda_readdir(void *v) 1531 { 1532 /* true args */ 1533 struct vop_readdir_args *ap = v; 1534 vnode_t *vp = ap->a_vp; 1535 struct cnode *cp = VTOC(vp); 1536 struct uio *uiop = ap->a_uio; 1537 kauth_cred_t cred = ap->a_cred; 1538 int *eofflag = ap->a_eofflag; 1539 /* upcall decl */ 1540 /* locals */ 1541 size_t initial_resid = uiop->uio_resid; 1542 int error = 0; 1543 int opened_internally = 0; 1544 int ncookies; 1545 char *buf; 1546 struct vnode *cvp; 1547 struct dirent *dirp; 1548 1549 MARK_ENTRY(CODA_READDIR_STATS); 1550 1551 CODADEBUG(CODA_READDIR, myprintf(("%s: (%p, %lu, %lld)\n", __func__, 1552 uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, 1553 (long long) uiop->uio_offset)); ) 1554 1555 /* Check for readdir of control object. */ 1556 if (IS_CTL_VP(vp)) { 1557 MARK_INT_FAIL(CODA_READDIR_STATS); 1558 return ENOENT; 1559 } 1560 1561 /* If directory is not already open do an "internal open" on it. */ 1562 if (cp->c_ovp == NULL) { 1563 opened_internally = 1; 1564 MARK_INT_GEN(CODA_OPEN_STATS); 1565 error = VOP_OPEN(vp, FREAD, cred); 1566 #ifdef CODA_VERBOSE 1567 printf("%s: Internally Opening %p\n", __func__, vp); 1568 #endif 1569 if (error) 1570 return error; 1571 KASSERT(cp->c_ovp != NULL); 1572 } 1573 cvp = cp->c_ovp; 1574 1575 CODADEBUG(CODA_READDIR, myprintf(("%s: fid = %s, refcnt = %d\n", 1576 __func__, coda_f2s(&cp->c_fid), vrefcnt(cvp))); ) 1577 1578 if (ap->a_ncookies) { 1579 ncookies = ap->a_uio->uio_resid / _DIRENT_RECLEN(dirp, 1); 1580 *ap->a_ncookies = 0; 1581 *ap->a_cookies = malloc(ncookies * sizeof (off_t), 1582 M_TEMP, M_WAITOK); 1583 } 1584 buf = kmem_alloc(CODA_DIRBLKSIZ, KM_SLEEP); 1585 dirp = kmem_alloc(sizeof(*dirp), KM_SLEEP); 1586 vn_lock(cvp, LK_EXCLUSIVE | LK_RETRY); 1587 1588 while (error == 0) { 1589 size_t resid = 0; 1590 char *dp, *ep; 1591 1592 if (!ALIGNED_POINTER(uiop->uio_offset, uint32_t)) { 1593 error = EINVAL; 1594 break; 1595 } 1596 error = vn_rdwr(UIO_READ, cvp, buf, 1597 CODA_DIRBLKSIZ, uiop->uio_offset, 1598 UIO_SYSSPACE, IO_NODELOCKED, cred, &resid, curlwp); 1599 if (error || resid == CODA_DIRBLKSIZ) 1600 break; 1601 for (dp = buf, ep = dp + CODA_DIRBLKSIZ - resid; dp < ep; ) { 1602 off_t off; 1603 struct venus_dirent *vd = (struct venus_dirent *)dp; 1604 1605 if (!ALIGNED_POINTER(vd, uint32_t) || 1606 !ALIGNED_POINTER(vd->d_reclen, uint32_t) || 1607 vd->d_reclen == 0) { 1608 error = EINVAL; 1609 break; 1610 } 1611 if (dp + vd->d_reclen > ep) { 1612 error = ENAMETOOLONG; 1613 break; 1614 } 1615 if (vd->d_namlen == 0) { 1616 uiop->uio_offset += vd->d_reclen; 1617 dp += vd->d_reclen; 1618 continue; 1619 } 1620 1621 dirp->d_fileno = vd->d_fileno; 1622 dirp->d_type = vd->d_type; 1623 dirp->d_namlen = vd->d_namlen; 1624 dirp->d_reclen = _DIRENT_SIZE(dirp); 1625 strlcpy(dirp->d_name, vd->d_name, dirp->d_namlen + 1); 1626 1627 if (uiop->uio_resid < dirp->d_reclen) { 1628 error = ENAMETOOLONG; 1629 break; 1630 } 1631 1632 off = uiop->uio_offset; 1633 error = uiomove(dirp, dirp->d_reclen, uiop); 1634 uiop->uio_offset = off; 1635 if (error) 1636 break; 1637 1638 uiop->uio_offset += vd->d_reclen; 1639 dp += vd->d_reclen; 1640 if (ap->a_ncookies) 1641 (*ap->a_cookies)[(*ap->a_ncookies)++] = 1642 uiop->uio_offset; 1643 } 1644 } 1645 1646 VOP_UNLOCK(cvp); 1647 kmem_free(dirp, sizeof(*dirp)); 1648 kmem_free(buf, CODA_DIRBLKSIZ); 1649 if (eofflag && error == 0) 1650 *eofflag = 1; 1651 if (uiop->uio_resid < initial_resid && error == ENAMETOOLONG) 1652 error = 0; 1653 if (ap->a_ncookies && error) { 1654 free(*ap->a_cookies, M_TEMP); 1655 *ap->a_ncookies = 0; 1656 *ap->a_cookies = NULL; 1657 } 1658 if (error) 1659 MARK_INT_FAIL(CODA_READDIR_STATS); 1660 else 1661 MARK_INT_SAT(CODA_READDIR_STATS); 1662 1663 /* Do an "internal close" if necessary. */ 1664 if (opened_internally) { 1665 MARK_INT_GEN(CODA_CLOSE_STATS); 1666 (void)VOP_CLOSE(vp, FREAD, cred); 1667 } 1668 1669 return error; 1670 } 1671 1672 /* 1673 * Convert from file system blocks to device blocks 1674 */ 1675 int 1676 coda_bmap(void *v) 1677 { 1678 /* XXX on the global proc */ 1679 /* true args */ 1680 struct vop_bmap_args *ap = v; 1681 vnode_t *vp __unused = ap->a_vp; /* file's vnode */ 1682 daddr_t bn __unused = ap->a_bn; /* fs block number */ 1683 vnode_t **vpp = ap->a_vpp; /* RETURN vp of device */ 1684 daddr_t *bnp __unused = ap->a_bnp; /* RETURN device block number */ 1685 struct lwp *l __unused = curlwp; 1686 /* upcall decl */ 1687 /* locals */ 1688 1689 *vpp = (vnode_t *)0; 1690 myprintf(("coda_bmap called!\n")); 1691 return(EINVAL); 1692 } 1693 1694 /* 1695 * I don't think the following two things are used anywhere, so I've 1696 * commented them out 1697 * 1698 * struct buf *async_bufhead; 1699 * int async_daemon_count; 1700 */ 1701 int 1702 coda_strategy(void *v) 1703 { 1704 /* true args */ 1705 struct vop_strategy_args *ap = v; 1706 struct buf *bp __unused = ap->a_bp; 1707 struct lwp *l __unused = curlwp; 1708 /* upcall decl */ 1709 /* locals */ 1710 1711 myprintf(("coda_strategy called! ")); 1712 return(EINVAL); 1713 } 1714 1715 int 1716 coda_reclaim(void *v) 1717 { 1718 /* true args */ 1719 struct vop_reclaim_v2_args *ap = v; 1720 vnode_t *vp = ap->a_vp; 1721 struct cnode *cp = VTOC(vp); 1722 /* upcall decl */ 1723 /* locals */ 1724 1725 VOP_UNLOCK(vp); 1726 1727 /* 1728 * Forced unmount/flush will let vnodes with non zero use be destroyed! 1729 */ 1730 ENTRY; 1731 1732 if (IS_UNMOUNTING(cp)) { 1733 #ifdef DEBUG 1734 if (VTOC(vp)->c_ovp) { 1735 if (IS_UNMOUNTING(cp)) 1736 printf("%s: c_ovp not void: vp %p, cp %p\n", __func__, vp, cp); 1737 } 1738 #endif 1739 } else { 1740 #ifdef OLD_DIAGNOSTIC 1741 if (vrefcnt(vp) != 0) 1742 print("%s: pushing active %p\n", __func__, vp); 1743 if (VTOC(vp)->c_ovp) { 1744 panic("%s: c_ovp not void", __func__); 1745 } 1746 #endif 1747 } 1748 /* If an array has been allocated to hold the symlink, deallocate it */ 1749 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { 1750 if (cp->c_symlink == NULL) 1751 panic("%s: null symlink pointer in cnode", __func__); 1752 1753 CODA_FREE(cp->c_symlink, cp->c_symlen); 1754 cp->c_flags &= ~C_SYMLINK; 1755 cp->c_symlen = 0; 1756 } 1757 1758 mutex_enter(vp->v_interlock); 1759 mutex_enter(&cp->c_lock); 1760 SET_VTOC(vp) = NULL; 1761 mutex_exit(&cp->c_lock); 1762 mutex_exit(vp->v_interlock); 1763 mutex_destroy(&cp->c_lock); 1764 kmem_free(cp, sizeof(*cp)); 1765 1766 return (0); 1767 } 1768 1769 int 1770 coda_lock(void *v) 1771 { 1772 /* true args */ 1773 struct vop_lock_args *ap = v; 1774 vnode_t *vp = ap->a_vp; 1775 struct cnode *cp = VTOC(vp); 1776 /* upcall decl */ 1777 /* locals */ 1778 1779 ENTRY; 1780 1781 if (coda_lockdebug) { 1782 myprintf(("Attempting lock on %s\n", 1783 coda_f2s(&cp->c_fid))); 1784 } 1785 1786 return genfs_lock(v); 1787 } 1788 1789 int 1790 coda_unlock(void *v) 1791 { 1792 /* true args */ 1793 struct vop_unlock_args *ap = v; 1794 vnode_t *vp = ap->a_vp; 1795 struct cnode *cp = VTOC(vp); 1796 /* upcall decl */ 1797 /* locals */ 1798 1799 ENTRY; 1800 if (coda_lockdebug) { 1801 myprintf(("Attempting unlock on %s\n", 1802 coda_f2s(&cp->c_fid))); 1803 } 1804 1805 return genfs_unlock(v); 1806 } 1807 1808 int 1809 coda_islocked(void *v) 1810 { 1811 /* true args */ 1812 ENTRY; 1813 1814 return genfs_islocked(v); 1815 } 1816 1817 int 1818 coda_pathconf(void *v) 1819 { 1820 struct vop_pathconf_args *ap = v; 1821 1822 switch (ap->a_name) { 1823 default: 1824 return EINVAL; 1825 } 1826 /* NOTREACHED */ 1827 } 1828 1829 /* 1830 * Given a device and inode, obtain a locked vnode. One reference is 1831 * obtained and passed back to the caller. 1832 */ 1833 int 1834 coda_grab_vnode(vnode_t *uvp, dev_t dev, ino_t ino, vnode_t **vpp) 1835 { 1836 int error; 1837 struct mount *mp; 1838 1839 /* Obtain mount point structure from device. */ 1840 if (!(mp = devtomp(dev))) { 1841 myprintf(("%s: devtomp(0x%llx) returns NULL\n", __func__, 1842 (unsigned long long)dev)); 1843 return(ENXIO); 1844 } 1845 1846 /* 1847 * Obtain vnode from mount point and inode. 1848 */ 1849 error = VFS_VGET(mp, ino, LK_EXCLUSIVE, vpp); 1850 if (error) { 1851 myprintf(("%s: iget/vget(0x%llx, %llu) returns %p, err %d\n", __func__, 1852 (unsigned long long)dev, (unsigned long long)ino, *vpp, error)); 1853 return(ENOENT); 1854 } 1855 /* share the underlying vnode lock with the coda vnode */ 1856 vshareilock(*vpp, uvp); 1857 KASSERT(VOP_ISLOCKED(*vpp)); 1858 return(0); 1859 } 1860 1861 static void 1862 coda_print_vattr(struct vattr *attr) 1863 { 1864 const char *typestr; 1865 1866 switch (attr->va_type) { 1867 case VNON: 1868 typestr = "VNON"; 1869 break; 1870 case VREG: 1871 typestr = "VREG"; 1872 break; 1873 case VDIR: 1874 typestr = "VDIR"; 1875 break; 1876 case VBLK: 1877 typestr = "VBLK"; 1878 break; 1879 case VCHR: 1880 typestr = "VCHR"; 1881 break; 1882 case VLNK: 1883 typestr = "VLNK"; 1884 break; 1885 case VSOCK: 1886 typestr = "VSCK"; 1887 break; 1888 case VFIFO: 1889 typestr = "VFFO"; 1890 break; 1891 case VBAD: 1892 typestr = "VBAD"; 1893 break; 1894 default: 1895 typestr = "????"; 1896 break; 1897 } 1898 1899 1900 myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n", 1901 typestr, (int)attr->va_mode, (int)attr->va_uid, 1902 (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); 1903 1904 myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n", 1905 (int)attr->va_fileid, (int)attr->va_nlink, 1906 (int)attr->va_size, 1907 (int)attr->va_blocksize,(int)attr->va_bytes)); 1908 myprintf((" gen %ld flags %ld vaflags %d\n", 1909 attr->va_gen, attr->va_flags, attr->va_vaflags)); 1910 myprintf((" atime sec %d nsec %d\n", 1911 (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec)); 1912 myprintf((" mtime sec %d nsec %d\n", 1913 (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec)); 1914 myprintf((" ctime sec %d nsec %d\n", 1915 (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec)); 1916 } 1917 1918 /* 1919 * Return a vnode for the given fid. 1920 * If no cnode exists for this fid create one and put it 1921 * in a table hashed by coda_f2i(). If the cnode for 1922 * this fid is already in the table return it (ref count is 1923 * incremented by coda_find. The cnode will be flushed from the 1924 * table when coda_inactive calls coda_unsave. 1925 */ 1926 struct cnode * 1927 make_coda_node(CodaFid *fid, struct mount *fvsp, short type) 1928 { 1929 int error __diagused; 1930 struct vnode *vp; 1931 struct cnode *cp; 1932 1933 error = vcache_get(fvsp, fid, sizeof(CodaFid), &vp); 1934 KASSERT(error == 0); 1935 1936 mutex_enter(vp->v_interlock); 1937 cp = VTOC(vp); 1938 KASSERT(cp != NULL); 1939 mutex_enter(&cp->c_lock); 1940 mutex_exit(vp->v_interlock); 1941 1942 if (vp->v_type != type) { 1943 if (vp->v_type == VCHR || vp->v_type == VBLK) 1944 spec_node_destroy(vp); 1945 vp->v_type = type; 1946 if (type == VCHR || type == VBLK) 1947 spec_node_init(vp, NODEV); 1948 uvm_vnp_setsize(vp, 0); 1949 } 1950 mutex_exit(&cp->c_lock); 1951 1952 return cp; 1953 } 1954 1955 /* 1956 * coda_getpages may be called on a vnode which has not been opened, 1957 * e.g. to fault in pages to execute a program. In that case, we must 1958 * open the file to get the container. The vnode may or may not be 1959 * locked, and we must leave it in the same state. 1960 */ 1961 int 1962 coda_getpages(void *v) 1963 { 1964 struct vop_getpages_args /* { 1965 vnode_t *a_vp; 1966 voff_t a_offset; 1967 struct vm_page **a_m; 1968 int *a_count; 1969 int a_centeridx; 1970 vm_prot_t a_access_type; 1971 int a_advice; 1972 int a_flags; 1973 } */ *ap = v; 1974 vnode_t *vp = ap->a_vp, *cvp; 1975 struct cnode *cp = VTOC(vp); 1976 struct lwp *l = curlwp; 1977 kauth_cred_t cred = l->l_cred; 1978 int error, cerror; 1979 int waslocked; /* 1 if vnode lock was held on entry */ 1980 int didopen = 0; /* 1 if we opened container file */ 1981 krw_t op; 1982 1983 /* 1984 * Handle a case that uvm_fault doesn't quite use yet. 1985 * See layer_vnops.c. for inspiration. 1986 */ 1987 if (ap->a_flags & PGO_LOCKED) { 1988 return EBUSY; 1989 } 1990 1991 KASSERT(rw_lock_held(vp->v_uobj.vmobjlock)); 1992 1993 /* Check for control object. */ 1994 if (IS_CTL_VP(vp)) { 1995 #ifdef CODA_VERBOSE 1996 printf("%s: control object %p\n", __func__, vp); 1997 #endif 1998 return(EINVAL); 1999 } 2000 2001 /* 2002 * XXX It's really not ok to be releasing the lock we get, 2003 * because we could be overlapping with another call to 2004 * getpages and drop a lock they are relying on. We need to 2005 * figure out whether getpages ever is called holding the 2006 * lock, and if we should serialize getpages calls by some 2007 * mechanism. 2008 */ 2009 /* XXX VOP_ISLOCKED() may not be used for lock decisions. */ 2010 op = rw_lock_op(vp->v_uobj.vmobjlock); 2011 waslocked = VOP_ISLOCKED(vp); 2012 2013 /* Get container file if not already present. */ 2014 cvp = cp->c_ovp; 2015 if (cvp == NULL) { 2016 /* 2017 * VOP_OPEN requires a locked vnode. We must avoid 2018 * locking the vnode if it is already locked, and 2019 * leave it in the same state on exit. 2020 */ 2021 if (waslocked == 0) { 2022 rw_exit(vp->v_uobj.vmobjlock); 2023 cerror = vn_lock(vp, LK_EXCLUSIVE); 2024 if (cerror) { 2025 #ifdef CODA_VERBOSE 2026 printf("%s: can't lock vnode %p\n", 2027 __func__, vp); 2028 #endif 2029 return cerror; 2030 } 2031 #ifdef CODA_VERBOSE 2032 printf("%s: locked vnode %p\n", __func__, vp); 2033 #endif 2034 } 2035 2036 /* 2037 * Open file (causes upcall to venus). 2038 * XXX Perhaps we should not fully open the file, but 2039 * simply obtain a container file. 2040 */ 2041 /* XXX Is it ok to do this while holding the mutex? */ 2042 cerror = VOP_OPEN(vp, FREAD, cred); 2043 2044 if (cerror) { 2045 #ifdef CODA_VERBOSE 2046 printf("%s: cannot open vnode %p => %d\n", __func__, 2047 vp, cerror); 2048 #endif 2049 if (waslocked == 0) 2050 VOP_UNLOCK(vp); 2051 return cerror; 2052 } 2053 2054 #ifdef CODA_VERBOSE 2055 printf("%s: opened vnode %p\n", __func__, vp); 2056 #endif 2057 cvp = cp->c_ovp; 2058 didopen = 1; 2059 if (waslocked == 0) 2060 rw_enter(vp->v_uobj.vmobjlock, op); 2061 } 2062 KASSERT(cvp != NULL); 2063 2064 /* Munge the arg structure to refer to the container vnode. */ 2065 KASSERT(cvp->v_uobj.vmobjlock == vp->v_uobj.vmobjlock); 2066 ap->a_vp = cp->c_ovp; 2067 2068 /* Finally, call getpages on it. */ 2069 error = VCALL(ap->a_vp, VOFFSET(vop_getpages), ap); 2070 2071 /* If we opened the vnode, we must close it. */ 2072 if (didopen) { 2073 /* 2074 * VOP_CLOSE requires a locked vnode, but we are still 2075 * holding the lock (or riding a caller's lock). 2076 */ 2077 cerror = VOP_CLOSE(vp, FREAD, cred); 2078 #ifdef CODA_VERBOSE 2079 if (cerror != 0) 2080 /* XXX How should we handle this? */ 2081 printf("%s: closed vnode %p -> %d\n", __func__, 2082 vp, cerror); 2083 #endif 2084 2085 /* If we obtained a lock, drop it. */ 2086 if (waslocked == 0) 2087 VOP_UNLOCK(vp); 2088 } 2089 2090 return error; 2091 } 2092 2093 /* 2094 * The protocol requires v_interlock to be held by the caller. 2095 */ 2096 int 2097 coda_putpages(void *v) 2098 { 2099 struct vop_putpages_args /* { 2100 vnode_t *a_vp; 2101 voff_t a_offlo; 2102 voff_t a_offhi; 2103 int a_flags; 2104 } */ *ap = v; 2105 vnode_t *vp = ap->a_vp, *cvp; 2106 struct cnode *cp = VTOC(vp); 2107 int error; 2108 2109 KASSERT(rw_write_held(vp->v_uobj.vmobjlock)); 2110 2111 /* Check for control object. */ 2112 if (IS_CTL_VP(vp)) { 2113 rw_exit(vp->v_uobj.vmobjlock); 2114 #ifdef CODA_VERBOSE 2115 printf("%s: control object %p\n", __func__, vp); 2116 #endif 2117 return 0; 2118 } 2119 2120 /* 2121 * If container object is not present, then there are no pages 2122 * to put; just return without error. This happens all the 2123 * time, apparently during discard of a closed vnode (which 2124 * trivially can't have dirty pages). 2125 */ 2126 cvp = cp->c_ovp; 2127 if (cvp == NULL) { 2128 rw_exit(vp->v_uobj.vmobjlock); 2129 return 0; 2130 } 2131 2132 /* Munge the arg structure to refer to the container vnode. */ 2133 KASSERT(cvp->v_uobj.vmobjlock == vp->v_uobj.vmobjlock); 2134 ap->a_vp = cvp; 2135 2136 /* Finally, call putpages on it. */ 2137 error = VCALL(ap->a_vp, VOFFSET(vop_putpages), ap); 2138 2139 return error; 2140 } 2141
Indexes created Tue Oct 14 15:09:51 GMT 2025