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sys/fs/coda/coda_vnops.c
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1 /*- 2 * Coda: an Experimental Distributed File System 3 * Release 3.1 4 * 5 * Copyright (c) 1987-1998 Carnegie Mellon University 6 * All Rights Reserved 7 * 8 * Permission to use, copy, modify and distribute this software and its 9 * documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation, and 13 * that credit is given to Carnegie Mellon University in all documents 14 * and publicity pertaining to direct or indirect use of this code or its 15 * derivatives. 16 * 17 * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS, 18 * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS 19 * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON 20 * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER 21 * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF 22 * ANY DERIVATIVE WORK. 23 * 24 * Carnegie Mellon encourages users of this software to return any 25 * improvements or extensions that they make, and to grant Carnegie 26 * Mellon the rights to redistribute these changes without encumbrance. 27 * 28 * @(#) src/sys/coda/coda_vnops.c,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $ 29 */ 30 /* 31 * Mach Operating System 32 * Copyright (c) 1990 Carnegie-Mellon University 33 * Copyright (c) 1989 Carnegie-Mellon University 34 * All rights reserved. The CMU software License Agreement specifies 35 * the terms and conditions for use and redistribution. 36 */ 37 38 /* 39 * This code was written for the Coda filesystem at Carnegie Mellon 40 * University. Contributers include David Steere, James Kistler, and 41 * M. Satyanarayanan. 42 */ 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD: releng/8.4/sys/fs/coda/coda_vnops.c 215860 2010-11-26 11:37:35Z kib $"); 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/acct.h> 50 #include <sys/errno.h> 51 #include <sys/fcntl.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/malloc.h> 55 #include <sys/file.h> /* Must come after sys/malloc.h */ 56 #include <sys/mount.h> 57 #include <sys/mutex.h> 58 #include <sys/namei.h> 59 #include <sys/proc.h> 60 #include <sys/uio.h> 61 #include <sys/unistd.h> 62 63 #include <vm/vm.h> 64 #include <vm/vm_object.h> 65 #include <vm/vm_extern.h> 66 67 #include <fs/coda/coda.h> 68 #include <fs/coda/cnode.h> 69 #include <fs/coda/coda_vnops.h> 70 #include <fs/coda/coda_venus.h> 71 #include <fs/coda/coda_opstats.h> 72 #include <fs/coda/coda_subr.h> 73 #include <fs/coda/coda_pioctl.h> 74 75 /* 76 * These flags select various performance enhancements. 77 */ 78 static int coda_attr_cache = 1; /* Set to cache attributes. */ 79 static int coda_symlink_cache = 1; /* Set to cache symbolic links. */ 80 static int coda_access_cache = 1; /* Set to cache some access checks. */ 81 82 /* 83 * Structure to keep track of vfs calls. 84 */ 85 static struct coda_op_stats coda_vnodeopstats[CODA_VNODEOPS_SIZE]; 86 87 #define MARK_ENTRY(op) (coda_vnodeopstats[op].entries++) 88 #define MARK_INT_SAT(op) (coda_vnodeopstats[op].sat_intrn++) 89 #define MARK_INT_FAIL(op) (coda_vnodeopstats[op].unsat_intrn++) 90 #define MARK_INT_GEN(op) (coda_vnodeopstats[op].gen_intrn++) 91 92 /* 93 * What we are delaying for in printf. 94 */ 95 int coda_printf_delay = 0; /* In microseconds */ 96 int coda_vnop_print_entry = 0; 97 static int coda_lockdebug = 0; 98 99 /* 100 * Some FreeBSD details: 101 * 102 * codadev_modevent is called at boot time or module load time. 103 */ 104 #define ENTRY do { \ 105 if (coda_vnop_print_entry) \ 106 myprintf(("Entered %s\n", __func__)); \ 107 } while (0) 108 109 /* 110 * Definition of the vnode operation vector. 111 */ 112 struct vop_vector coda_vnodeops = { 113 .vop_default = &default_vnodeops, 114 .vop_cachedlookup = coda_lookup, /* uncached lookup */ 115 .vop_lookup = vfs_cache_lookup, /* namecache lookup */ 116 .vop_create = coda_create, /* create */ 117 .vop_open = coda_open, /* open */ 118 .vop_close = coda_close, /* close */ 119 .vop_access = coda_access, /* access */ 120 .vop_getattr = coda_getattr, /* getattr */ 121 .vop_setattr = coda_setattr, /* setattr */ 122 .vop_read = coda_read, /* read */ 123 .vop_write = coda_write, /* write */ 124 .vop_ioctl = coda_ioctl, /* ioctl */ 125 .vop_fsync = coda_fsync, /* fsync */ 126 .vop_remove = coda_remove, /* remove */ 127 .vop_link = coda_link, /* link */ 128 .vop_rename = coda_rename, /* rename */ 129 .vop_mkdir = coda_mkdir, /* mkdir */ 130 .vop_rmdir = coda_rmdir, /* rmdir */ 131 .vop_symlink = coda_symlink, /* symlink */ 132 .vop_readdir = coda_readdir, /* readdir */ 133 .vop_readlink = coda_readlink, /* readlink */ 134 .vop_inactive = coda_inactive, /* inactive */ 135 .vop_reclaim = coda_reclaim, /* reclaim */ 136 .vop_lock1 = coda_lock, /* lock */ 137 .vop_unlock = coda_unlock, /* unlock */ 138 .vop_bmap = VOP_EOPNOTSUPP, /* bmap */ 139 .vop_print = VOP_NULL, /* print */ 140 .vop_islocked = coda_islocked, /* islocked */ 141 .vop_pathconf = coda_pathconf, /* pathconf */ 142 .vop_poll = vop_stdpoll, 143 .vop_getpages = vop_stdgetpages, /* pager intf.*/ 144 .vop_putpages = vop_stdputpages, /* pager intf.*/ 145 .vop_getwritemount = vop_stdgetwritemount, 146 #if 0 147 /* missing */ 148 .vop_cachedlookup = ufs_lookup, 149 .vop_whiteout = ufs_whiteout, 150 #endif 151 152 }; 153 154 static void coda_print_vattr(struct vattr *attr); 155 156 int 157 coda_vnodeopstats_init(void) 158 { 159 int i; 160 161 for(i=0; i<CODA_VNODEOPS_SIZE; i++) { 162 coda_vnodeopstats[i].opcode = i; 163 coda_vnodeopstats[i].entries = 0; 164 coda_vnodeopstats[i].sat_intrn = 0; 165 coda_vnodeopstats[i].unsat_intrn = 0; 166 coda_vnodeopstats[i].gen_intrn = 0; 167 } 168 return (0); 169 } 170 171 /* 172 * coda_open calls Venus which returns an open file descriptor the cache file 173 * holding the data. We get the vnode while we are still in the context of 174 * the venus process in coda_psdev.c. This vnode is then passed back to the 175 * caller and opened. 176 */ 177 int 178 coda_open(struct vop_open_args *ap) 179 { 180 181 /* 182 * FreeBSD can pass the O_EXCL flag in mode, even though the check 183 * has already happened. Venus defensively assumes that if open is 184 * passed the EXCL, it must be a bug. We strip the flag here. 185 */ 186 /* true args */ 187 struct vnode **vpp = &(ap->a_vp); 188 struct cnode *cp = VTOC(*vpp); 189 int flag = ap->a_mode & (~O_EXCL); 190 struct ucred *cred = ap->a_cred; 191 struct thread *td = ap->a_td; 192 /* locals */ 193 int error; 194 struct vnode *vp; 195 196 MARK_ENTRY(CODA_OPEN_STATS); 197 198 /* 199 * Check for open of control file. 200 */ 201 if (IS_CTL_VP(*vpp)) { 202 /* XXX */ 203 /* if (WRITEABLE(flag)) */ 204 if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) { 205 MARK_INT_FAIL(CODA_OPEN_STATS); 206 return (EACCES); 207 } 208 MARK_INT_SAT(CODA_OPEN_STATS); 209 return (0); 210 } 211 error = venus_open(vtomi((*vpp)), &cp->c_fid, flag, cred, 212 td->td_proc, &vp); 213 if (error) 214 return (error); 215 CODADEBUG(CODA_OPEN, myprintf(("open: vp %p result %d\n", vp, 216 error));); 217 218 /* 219 * Save the vnode pointer for the cache file. 220 */ 221 if (cp->c_ovp == NULL) { 222 cp->c_ovp = vp; 223 } else { 224 if (cp->c_ovp != vp) 225 panic("coda_open: cp->c_ovp != ITOV(ip)"); 226 } 227 cp->c_ocount++; 228 229 /* 230 * Flush the attribute cached if writing the file. 231 */ 232 if (flag & FWRITE) { 233 cp->c_owrite++; 234 cp->c_flags &= ~C_VATTR; 235 } 236 237 /* 238 * Open the cache file. 239 */ 240 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 241 error = VOP_OPEN(vp, flag, cred, td, NULL); 242 if (error) { 243 VOP_UNLOCK(vp, 0); 244 printf("coda_open: VOP_OPEN on container failed %d\n", error); 245 return (error); 246 } 247 (*vpp)->v_object = vp->v_object; 248 VOP_UNLOCK(vp, 0); 249 return (0); 250 } 251 252 /* 253 * Close the cache file used for I/O and notify Venus. 254 */ 255 int 256 coda_close(struct vop_close_args *ap) 257 { 258 /* true args */ 259 struct vnode *vp = ap->a_vp; 260 struct cnode *cp = VTOC(vp); 261 int flag = ap->a_fflag; 262 struct ucred *cred = ap->a_cred; 263 struct thread *td = ap->a_td; 264 /* locals */ 265 int error; 266 267 MARK_ENTRY(CODA_CLOSE_STATS); 268 269 /* 270 * Check for close of control file. 271 */ 272 if (IS_CTL_VP(vp)) { 273 MARK_INT_SAT(CODA_CLOSE_STATS); 274 return (0); 275 } 276 if (cp->c_ovp) { 277 vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); 278 /* Do errors matter here? */ 279 VOP_CLOSE(cp->c_ovp, flag, cred, td); 280 vput(cp->c_ovp); 281 } 282 #ifdef CODA_VERBOSE 283 else 284 printf("coda_close: NO container vp %p/cp %p\n", vp, cp); 285 #endif 286 if (--cp->c_ocount == 0) 287 cp->c_ovp = NULL; 288 289 /* 290 * File was opened for write. 291 */ 292 if (flag & FWRITE) 293 --cp->c_owrite; 294 if (!IS_UNMOUNTING(cp)) 295 error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, 296 td->td_proc); 297 else 298 error = ENODEV; 299 CODADEBUG(CODA_CLOSE, myprintf(("close: result %d\n",error));); 300 return (error); 301 } 302 303 int 304 coda_read(struct vop_read_args *ap) 305 { 306 307 ENTRY; 308 return (coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, ap->a_ioflag, 309 ap->a_cred, ap->a_uio->uio_td)); 310 } 311 312 int 313 coda_write(struct vop_write_args *ap) 314 { 315 316 ENTRY; 317 return (coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, ap->a_ioflag, 318 ap->a_cred, ap->a_uio->uio_td)); 319 } 320 321 int 322 coda_rdwr(struct vnode *vp, struct uio *uiop, enum uio_rw rw, int ioflag, 323 struct ucred *cred, struct thread *td) 324 { 325 /* upcall decl */ 326 /* NOTE: container file operation!!! */ 327 /* locals */ 328 struct cnode *cp = VTOC(vp); 329 struct vnode *cfvp = cp->c_ovp; 330 int opened_internally = 0; 331 int error = 0; 332 333 MARK_ENTRY(CODA_RDWR_STATS); 334 CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %zd, %lld, %d)\n", 335 rw, (void *)uiop->uio_iov->iov_base, uiop->uio_resid, 336 (long long)uiop->uio_offset, uiop->uio_segflg));); 337 338 /* 339 * Check for rdwr of control object. 340 */ 341 if (IS_CTL_VP(vp)) { 342 MARK_INT_FAIL(CODA_RDWR_STATS); 343 return (EINVAL); 344 } 345 346 /* 347 * If file is not already open this must be a page {read,write} 348 * request and we should open it internally. 349 */ 350 if (cfvp == NULL) { 351 opened_internally = 1; 352 MARK_INT_GEN(CODA_OPEN_STATS); 353 error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), cred, 354 td, NULL); 355 #ifdef CODA_VERBOSE 356 printf("coda_rdwr: Internally Opening %p\n", vp); 357 #endif 358 if (error) { 359 printf("coda_rdwr: VOP_OPEN on container failed " 360 "%d\n", error); 361 return (error); 362 } 363 cfvp = cp->c_ovp; 364 } 365 366 /* 367 * Have UFS handle the call. 368 */ 369 CODADEBUG(CODA_RDWR, myprintf(("indirect rdwr: fid = %s, refcnt = " 370 "%d\n", coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount));); 371 vn_lock(cfvp, LK_EXCLUSIVE | LK_RETRY); 372 if (rw == UIO_READ) { 373 error = VOP_READ(cfvp, uiop, ioflag, cred); 374 } else { 375 error = VOP_WRITE(cfvp, uiop, ioflag, cred); 376 /* 377 * ufs_write updates the vnode_pager_setsize for the 378 * vnode/object. 379 * 380 * XXX: Since we now share vm objects between layers, this is 381 * probably unnecessary. 382 */ 383 { 384 struct vattr attr; 385 if (VOP_GETATTR(cfvp, &attr, cred) == 0) 386 vnode_pager_setsize(vp, attr.va_size); 387 } 388 } 389 VOP_UNLOCK(cfvp, 0); 390 if (error) 391 MARK_INT_FAIL(CODA_RDWR_STATS); 392 else 393 MARK_INT_SAT(CODA_RDWR_STATS); 394 395 /* 396 * Do an internal close if necessary. 397 */ 398 if (opened_internally) { 399 MARK_INT_GEN(CODA_CLOSE_STATS); 400 (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred, 401 td); 402 } 403 404 /* 405 * Invalidate cached attributes if writing. 406 */ 407 if (rw == UIO_WRITE) 408 cp->c_flags &= ~C_VATTR; 409 return (error); 410 } 411 412 int 413 coda_ioctl(struct vop_ioctl_args *ap) 414 { 415 /* true args */ 416 struct vnode *vp = ap->a_vp; 417 int com = ap->a_command; 418 caddr_t data = ap->a_data; 419 int flag = ap->a_fflag; 420 struct ucred *cred = ap->a_cred; 421 struct thread *td = ap->a_td; 422 /* locals */ 423 int error; 424 struct vnode *tvp; 425 struct nameidata ndp; 426 struct PioctlData *iap = (struct PioctlData *)data; 427 428 MARK_ENTRY(CODA_IOCTL_STATS); 429 CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));); 430 431 /* 432 * Don't check for operation on a dying object, for ctlvp it 433 * shouldn't matter. 434 * 435 * Must be control object to succeed. 436 */ 437 if (!IS_CTL_VP(vp)) { 438 MARK_INT_FAIL(CODA_IOCTL_STATS); 439 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: vp != " 440 "ctlvp"));); 441 return (EOPNOTSUPP); 442 } 443 444 /* 445 * Look up the pathname. 446 * 447 * Should we use the name cache here? It would get it from lookupname 448 * sooner or later anyway, right? 449 */ 450 NDINIT(&ndp, LOOKUP, (iap->follow ? FOLLOW : NOFOLLOW), 451 UIO_USERSPACE, iap->path, td); 452 error = namei(&ndp); 453 tvp = ndp.ni_vp; 454 if (error) { 455 MARK_INT_FAIL(CODA_IOCTL_STATS); 456 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: lookup " 457 "returns %d\n", error));); 458 return (error); 459 } 460 461 /* 462 * Make sure this is a coda style cnode, but it may be a different 463 * vfsp. 464 */ 465 if (tvp->v_op != &coda_vnodeops) { 466 vrele(tvp); 467 NDFREE(&ndp, NDF_ONLY_PNBUF); 468 MARK_INT_FAIL(CODA_IOCTL_STATS); 469 CODADEBUG(CODA_IOCTL, 470 myprintf(("coda_ioctl error: %s not a coda object\n", 471 iap->path));); 472 return (EINVAL); 473 } 474 if (iap->vi.in_size > VC_MAXDATASIZE) { 475 NDFREE(&ndp, 0); 476 return (EINVAL); 477 } 478 error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, 479 data, cred, td->td_proc); 480 if (error) 481 MARK_INT_FAIL(CODA_IOCTL_STATS); 482 else 483 CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", 484 error));); 485 vrele(tvp); 486 NDFREE(&ndp, NDF_ONLY_PNBUF); 487 return (error); 488 } 489 490 /* 491 * To reduce the cost of a user-level venus;we cache attributes in the 492 * kernel. Each cnode has storage allocated for an attribute. If c_vattr is 493 * valid, return a reference to it. Otherwise, get the attributes from venus 494 * and store them in the cnode. There is some question if this method is a 495 * security leak. But I think that in order to make this call, the user must 496 * have done a lookup and opened the file, and therefore should already have 497 * access. 498 */ 499 int 500 coda_getattr(struct vop_getattr_args *ap) 501 { 502 /* true args */ 503 struct vnode *vp = ap->a_vp; 504 struct cnode *cp = VTOC(vp); 505 struct vattr *vap = ap->a_vap; 506 struct ucred *cred = ap->a_cred; 507 /* locals */ 508 struct vnode *convp; 509 int error, size; 510 511 MARK_ENTRY(CODA_GETATTR_STATS); 512 if (IS_UNMOUNTING(cp)) 513 return (ENODEV); 514 515 /* 516 * Check for getattr of control object. 517 */ 518 if (IS_CTL_VP(vp)) { 519 MARK_INT_FAIL(CODA_GETATTR_STATS); 520 return (ENOENT); 521 } 522 523 /* 524 * Check to see if the attributes have already been cached. 525 */ 526 if (VALID_VATTR(cp)) { 527 CODADEBUG(CODA_GETATTR, myprintf(("attr cache hit: %s\n", 528 coda_f2s(&cp->c_fid)));); 529 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 530 coda_print_vattr(&cp->c_vattr);); 531 *vap = cp->c_vattr; 532 MARK_INT_SAT(CODA_GETATTR_STATS); 533 return (0); 534 } 535 error = venus_getattr(vtomi(vp), &cp->c_fid, cred, vap); 536 if (!error) { 537 CODADEBUG(CODA_GETATTR, myprintf(("getattr miss %s: result " 538 "%d\n", coda_f2s(&cp->c_fid), error));); 539 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) 540 coda_print_vattr(vap);); 541 542 /* 543 * XXX: Since we now share vm objects between layers, this is 544 * probably unnecessary. 545 */ 546 size = vap->va_size; 547 convp = cp->c_ovp; 548 if (convp != NULL) 549 vnode_pager_setsize(convp, size); 550 551 /* 552 * If not open for write, store attributes in cnode. 553 */ 554 if ((cp->c_owrite == 0) && (coda_attr_cache)) { 555 cp->c_vattr = *vap; 556 cp->c_flags |= C_VATTR; 557 } 558 } 559 return (error); 560 } 561 562 int 563 coda_setattr(struct vop_setattr_args *ap) 564 { 565 /* true args */ 566 struct vnode *vp = ap->a_vp; 567 struct cnode *cp = VTOC(vp); 568 struct vattr *vap = ap->a_vap; 569 struct ucred *cred = ap->a_cred; 570 /* locals */ 571 struct vnode *convp; 572 int error, size; 573 574 MARK_ENTRY(CODA_SETATTR_STATS); 575 576 /* 577 * Check for setattr of control object. 578 */ 579 if (IS_CTL_VP(vp)) { 580 MARK_INT_FAIL(CODA_SETATTR_STATS); 581 return (ENOENT); 582 } 583 if (codadebug & CODADBGMSK(CODA_SETATTR)) 584 coda_print_vattr(vap); 585 error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred); 586 if (!error) 587 cp->c_flags &= ~(C_VATTR | C_ACCCACHE); 588 589 /* 590 * XXX: Since we now share vm objects between layers, this is 591 * probably unnecessary. 592 * 593 * XXX: Shouldn't we only be doing this "set" if C_VATTR remains 594 * valid after venus_setattr()? 595 */ 596 size = vap->va_size; 597 convp = cp->c_ovp; 598 if (size != VNOVAL && convp != NULL) 599 vnode_pager_setsize(convp, size); 600 CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error));); 601 return (error); 602 } 603 604 int 605 coda_access(struct vop_access_args *ap) 606 { 607 /* true args */ 608 struct vnode *vp = ap->a_vp; 609 struct cnode *cp = VTOC(vp); 610 accmode_t accmode = ap->a_accmode; 611 struct ucred *cred = ap->a_cred; 612 struct thread *td = ap->a_td; 613 /* locals */ 614 int error; 615 616 MARK_ENTRY(CODA_ACCESS_STATS); 617 618 /* 619 * Check for access of control object. Only read access is allowed 620 * on it. 621 */ 622 if (IS_CTL_VP(vp)) { 623 /* 624 * Bogus hack - all will be marked as successes. 625 */ 626 MARK_INT_SAT(CODA_ACCESS_STATS); 627 return (((accmode & VREAD) && !(accmode & (VWRITE | VEXEC))) 628 ? 0 : EACCES); 629 } 630 631 /* 632 * We maintain a one-entry LRU positive access cache with each cnode. 633 * In principle we could also track negative results, and for more 634 * than one uid, but we don't yet. Venus is responsible for 635 * invalidating this cache as required. 636 */ 637 if (coda_access_cache && VALID_ACCCACHE(cp) && 638 (cred->cr_uid == cp->c_cached_uid) && 639 (accmode & cp->c_cached_mode) == accmode) { 640 MARK_INT_SAT(CODA_ACCESS_STATS); 641 return (0); 642 } 643 error = venus_access(vtomi(vp), &cp->c_fid, accmode, cred, td->td_proc); 644 if (error == 0 && coda_access_cache) { 645 /*- 646 * When we have a new successful request, we consider three 647 * cases: 648 * 649 * - No initialized access cache, in which case cache the 650 * result. 651 * - Cached result for a different user, in which case we 652 * replace the entry. 653 * - Cached result for the same user, in which case we add 654 * any newly granted rights to the cached mode. 655 * 656 * XXXRW: If we ever move to something more interesting than 657 * uid-based token lookup, we'll need to change this. 658 */ 659 cp->c_flags |= C_ACCCACHE; 660 if (cp->c_cached_uid != cred->cr_uid) { 661 cp->c_cached_mode = accmode; 662 cp->c_cached_uid = cred->cr_uid; 663 } else 664 cp->c_cached_mode |= accmode; 665 } 666 return (error); 667 } 668 669 int 670 coda_readlink(struct vop_readlink_args *ap) 671 { 672 /* true args */ 673 struct vnode *vp = ap->a_vp; 674 struct cnode *cp = VTOC(vp); 675 struct uio *uiop = ap->a_uio; 676 struct ucred *cred = ap->a_cred; 677 struct thread *td = ap->a_uio->uio_td; 678 /* locals */ 679 int error; 680 char *str; 681 int len; 682 683 MARK_ENTRY(CODA_READLINK_STATS); 684 685 /* 686 * Check for readlink of control object. 687 */ 688 if (IS_CTL_VP(vp)) { 689 MARK_INT_FAIL(CODA_READLINK_STATS); 690 return (ENOENT); 691 } 692 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { 693 /* 694 * Symlink was cached. 695 */ 696 uiop->uio_rw = UIO_READ; 697 error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop); 698 if (error) 699 MARK_INT_FAIL(CODA_READLINK_STATS); 700 else 701 MARK_INT_SAT(CODA_READLINK_STATS); 702 return (error); 703 } 704 error = venus_readlink(vtomi(vp), &cp->c_fid, cred, td != NULL ? 705 td->td_proc : NULL, &str, &len); 706 if (!error) { 707 uiop->uio_rw = UIO_READ; 708 error = uiomove(str, len, uiop); 709 if (coda_symlink_cache) { 710 cp->c_symlink = str; 711 cp->c_symlen = len; 712 cp->c_flags |= C_SYMLINK; 713 } else 714 CODA_FREE(str, len); 715 } 716 CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n", 717 error));); 718 return (error); 719 } 720 721 int 722 coda_fsync(struct vop_fsync_args *ap) 723 { 724 /* true args */ 725 struct vnode *vp = ap->a_vp; 726 struct cnode *cp = VTOC(vp); 727 struct thread *td = ap->a_td; 728 /* locals */ 729 struct vnode *convp = cp->c_ovp; 730 int error; 731 732 MARK_ENTRY(CODA_FSYNC_STATS); 733 734 /* 735 * Check for fsync on an unmounting object. 736 * 737 * XXX: Is this comment true on FreeBSD? It seems likely, since 738 * unmounting is fairly non-atomic. 739 * 740 * The NetBSD kernel, in it's infinite wisdom, can try to fsync after 741 * an unmount has been initiated. This is a Bad Thing, which we have 742 * to avoid. Not a legitimate failure for stats. 743 */ 744 if (IS_UNMOUNTING(cp)) 745 return (ENODEV); 746 747 /* 748 * Check for fsync of control object. 749 */ 750 if (IS_CTL_VP(vp)) { 751 MARK_INT_SAT(CODA_FSYNC_STATS); 752 return (0); 753 } 754 if (convp != NULL) { 755 vn_lock(convp, LK_EXCLUSIVE | LK_RETRY); 756 VOP_FSYNC(convp, MNT_WAIT, td); 757 VOP_UNLOCK(convp, 0); 758 } 759 760 /* 761 * We see fsyncs with usecount == 1 then usecount == 0. For now we 762 * ignore them. 763 */ 764 #if 0 765 VI_LOCK(vp); 766 if (!vp->v_usecount) { 767 printf("coda_fsync on vnode %p with %d usecount. " 768 "c_flags = %x (%x)\n", vp, vp->v_usecount, cp->c_flags, 769 cp->c_flags&C_PURGING); 770 } 771 VI_UNLOCK(vp); 772 #endif 773 774 /* 775 * We can expect fsync on any vnode at all if venus is purging it. 776 * Venus can't very well answer the fsync request, now can it? 777 * Hopefully, it won't have to, because hopefully, venus preserves 778 * the (possibly untrue) invariant that it never purges an open 779 * vnode. Hopefully. 780 */ 781 if (cp->c_flags & C_PURGING) 782 return (0); 783 784 /* XXX: needs research */ 785 return (0); 786 error = venus_fsync(vtomi(vp), &cp->c_fid, td->td_proc); 787 CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n", error));); 788 return (error); 789 } 790 791 int 792 coda_inactive(struct vop_inactive_args *ap) 793 { 794 /* 795 * XXX - at the moment, inactive doesn't look at cred, and doesn't 796 * have a proc pointer. Oops. 797 */ 798 /* true args */ 799 struct vnode *vp = ap->a_vp; 800 struct cnode *cp = VTOC(vp); 801 struct ucred *cred __attribute__((unused)) = NULL; 802 struct thread *td __attribute__((unused)) = curthread; 803 /* upcall decl */ 804 /* locals */ 805 806 /* 807 * We don't need to send inactive to venus - DCS. 808 */ 809 MARK_ENTRY(CODA_INACTIVE_STATS); 810 CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n", 811 coda_f2s(&cp->c_fid), vp->v_mount));); 812 vp->v_object = NULL; 813 814 /* 815 * If an array has been allocated to hold the symlink, deallocate it. 816 */ 817 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { 818 if (cp->c_symlink == NULL) 819 panic("coda_inactive: null symlink pointer in cnode"); 820 CODA_FREE(cp->c_symlink, cp->c_symlen); 821 cp->c_flags &= ~C_SYMLINK; 822 cp->c_symlen = 0; 823 } 824 825 /* 826 * Remove it from the table so it can't be found. 827 */ 828 coda_unsave(cp); 829 if ((struct coda_mntinfo *)(vp->v_mount->mnt_data) == NULL) { 830 myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p " 831 "wasn't dying\n", vp)); 832 panic("badness in coda_inactive\n"); 833 } 834 if (IS_UNMOUNTING(cp)) { 835 #ifdef DEBUG 836 printf("coda_inactive: IS_UNMOUNTING use %d: vp %p, cp %p\n", 837 vrefcnt(vp), vp, cp); 838 if (cp->c_ovp != NULL) 839 printf("coda_inactive: cp->ovp != NULL use %d: vp " 840 "%p, cp %p\n", vrefcnt(vp), vp, cp); 841 #endif 842 } else 843 vgone(vp); 844 MARK_INT_SAT(CODA_INACTIVE_STATS); 845 return (0); 846 } 847 848 /* 849 * Remote filesystem operations having to do with directory manipulation. 850 */ 851 852 /* 853 * In FreeBSD, lookup returns the vnode locked. 854 */ 855 int 856 coda_lookup(struct vop_cachedlookup_args *ap) 857 { 858 /* true args */ 859 struct vnode *dvp = ap->a_dvp; 860 struct cnode *dcp = VTOC(dvp); 861 struct vnode **vpp = ap->a_vpp; 862 /* 863 * It looks as though ap->a_cnp->ni_cnd->cn_nameptr holds the rest of 864 * the string to xlate, and that we must try to get at least 865 * ap->a_cnp->ni_cnd->cn_namelen of those characters to macth. I 866 * could be wrong. 867 */ 868 struct componentname *cnp = ap->a_cnp; 869 struct ucred *cred = cnp->cn_cred; 870 struct thread *td = cnp->cn_thread; 871 /* locals */ 872 struct cnode *cp; 873 const char *nm = cnp->cn_nameptr; 874 int len = cnp->cn_namelen; 875 struct CodaFid VFid; 876 int vtype; 877 int error = 0; 878 879 MARK_ENTRY(CODA_LOOKUP_STATS); 880 CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s in %s\n", nm, 881 coda_f2s(&dcp->c_fid)));); 882 883 /* 884 * Check for lookup of control object. 885 */ 886 if (IS_CTL_NAME(dvp, nm, len)) { 887 *vpp = coda_ctlvp; 888 vref(*vpp); 889 MARK_INT_SAT(CODA_LOOKUP_STATS); 890 goto exit; 891 } 892 if (len+1 > CODA_MAXNAMLEN) { 893 MARK_INT_FAIL(CODA_LOOKUP_STATS); 894 CODADEBUG(CODA_LOOKUP, myprintf(("name too long: lookup, " 895 "%s (%s)\n", coda_f2s(&dcp->c_fid), nm));); 896 *vpp = NULL; 897 error = EINVAL; 898 goto exit; 899 } 900 901 error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, 902 td->td_proc, &VFid, &vtype); 903 if (error) { 904 MARK_INT_FAIL(CODA_LOOKUP_STATS); 905 CODADEBUG(CODA_LOOKUP, myprintf(("lookup error on %s " 906 "(%s)%d\n", coda_f2s(&dcp->c_fid), nm, error));); 907 *vpp = NULL; 908 } else { 909 MARK_INT_SAT(CODA_LOOKUP_STATS); 910 CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s type %o " 911 "result %d\n", coda_f2s(&VFid), vtype, error));); 912 cp = make_coda_node(&VFid, dvp->v_mount, vtype); 913 *vpp = CTOV(cp); 914 915 /* 916 * Enter the new vnode in the namecache only if the top bit 917 * isn't set. 918 * 919 * And don't enter a new vnode for an invalid one! 920 */ 921 if (!(vtype & CODA_NOCACHE) && (cnp->cn_flags & MAKEENTRY)) 922 cache_enter(dvp, *vpp, cnp); 923 } 924 exit: 925 /* 926 * If we are creating, and this was the last name to be looked up, 927 * and the error was ENOENT, then there really shouldn't be an error 928 * and we can make the leaf NULL and return success. Since this is 929 * supposed to work under Mach as well as FreeBSD, we're leaving this 930 * fn wrapped. We also must tell lookup/namei that we need to save 931 * the last component of the name. (Create will have to free the 932 * name buffer later...lucky us...). 933 */ 934 if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) 935 && (cnp->cn_flags & ISLASTCN) && (error == ENOENT)) { 936 error = EJUSTRETURN; 937 cnp->cn_flags |= SAVENAME; 938 *ap->a_vpp = NULL; 939 } 940 941 /* 942 * If we are removing, and we are at the last element, and we found 943 * it, then we need to keep the name around so that the removal will 944 * go ahead as planned. Unfortunately, this will probably also lock 945 * the to-be-removed vnode, which may or may not be a good idea. 946 * I'll have to look at the bits of coda_remove to make sure. We'll 947 * only save the name if we did in fact find the name, otherwise 948 * coda_remove won't have a chance to free the pathname. 949 */ 950 if ((cnp->cn_nameiop == DELETE) && (cnp->cn_flags & ISLASTCN) 951 && !error) 952 cnp->cn_flags |= SAVENAME; 953 954 /* 955 * If the lookup went well, we need to (potentially?) unlock the 956 * parent, and lock the child. We are only responsible for checking 957 * to see if the parent is supposed to be unlocked before we return. 958 * We must always lock the child (provided there is one, and (the 959 * parent isn't locked or it isn't the same as the parent.) Simple, 960 * huh? We can never leave the parent locked unless we are ISLASTCN. 961 */ 962 if (!error || (error == EJUSTRETURN)) { 963 if (cnp->cn_flags & ISDOTDOT) { 964 VOP_UNLOCK(dvp, 0); 965 /* 966 * The parent is unlocked. As long as there is a 967 * child, lock it without bothering to check anything 968 * else. 969 */ 970 if (*ap->a_vpp) 971 vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY); 972 vn_lock(dvp, LK_RETRY|LK_EXCLUSIVE); 973 } else { 974 /* 975 * The parent is locked, and may be the same as the 976 * child. If different, go ahead and lock it. 977 */ 978 if (*ap->a_vpp && (*ap->a_vpp != dvp)) 979 vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY); 980 } 981 } else { 982 /* 983 * If the lookup failed, we need to ensure that the leaf is 984 * NULL. 985 * 986 * Don't change any locking? 987 */ 988 *ap->a_vpp = NULL; 989 } 990 return (error); 991 } 992 993 /*ARGSUSED*/ 994 int 995 coda_create(struct vop_create_args *ap) 996 { 997 /* true args */ 998 struct vnode *dvp = ap->a_dvp; 999 struct cnode *dcp = VTOC(dvp); 1000 struct vattr *va = ap->a_vap; 1001 int exclusive = 1; 1002 int mode = ap->a_vap->va_mode; 1003 struct vnode **vpp = ap->a_vpp; 1004 struct componentname *cnp = ap->a_cnp; 1005 struct ucred *cred = cnp->cn_cred; 1006 struct thread *td = cnp->cn_thread; 1007 /* locals */ 1008 int error; 1009 struct cnode *cp; 1010 const char *nm = cnp->cn_nameptr; 1011 int len = cnp->cn_namelen; 1012 struct CodaFid VFid; 1013 struct vattr attr; 1014 1015 MARK_ENTRY(CODA_CREATE_STATS); 1016 1017 /* 1018 * All creates are exclusive XXX. 1019 * 1020 * I'm assuming the 'mode' argument is the file mode bits XXX. 1021 * 1022 * Check for create of control object. 1023 */ 1024 if (IS_CTL_NAME(dvp, nm, len)) { 1025 *vpp = (struct vnode *)0; 1026 MARK_INT_FAIL(CODA_CREATE_STATS); 1027 return (EACCES); 1028 } 1029 error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, 1030 mode, va, cred, td->td_proc, &VFid, &attr); 1031 if (!error) { 1032 /* 1033 * If this is an exclusive create, panic if the file already 1034 * exists. 1035 * 1036 * Venus should have detected the file and reported EEXIST. 1037 */ 1038 if ((exclusive == 1) && (coda_find(&VFid) != NULL)) 1039 panic("cnode existed for newly created file!"); 1040 cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); 1041 *vpp = CTOV(cp); 1042 1043 /* 1044 * Update va to reflect the new attributes. 1045 */ 1046 (*va) = attr; 1047 1048 /* 1049 * Update the attribute cache and mark it as valid. 1050 */ 1051 if (coda_attr_cache) { 1052 VTOC(*vpp)->c_vattr = attr; 1053 VTOC(*vpp)->c_flags |= C_VATTR; 1054 } 1055 1056 /* 1057 * Invalidate the parent's attr cache, the modification time 1058 * has changed. 1059 */ 1060 VTOC(dvp)->c_flags &= ~C_VATTR; 1061 cache_enter(dvp, *vpp, cnp); 1062 CODADEBUG(CODA_CREATE, myprintf(("create: %s, result %d\n", 1063 coda_f2s(&VFid), error));); 1064 } else { 1065 *vpp = (struct vnode *)0; 1066 CODADEBUG(CODA_CREATE, myprintf(("create error %d\n", 1067 error));); 1068 } 1069 if (!error) { 1070 if (cnp->cn_flags & MAKEENTRY) 1071 cache_enter(dvp, *vpp, cnp); 1072 if (cnp->cn_flags & LOCKLEAF) 1073 vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY); 1074 } else if (error == ENOENT) { 1075 /* 1076 * XXXRW: We only enter a negative entry if ENOENT is 1077 * returned, not other errors. But will Venus invalidate dvp 1078 * properly in all cases when new files appear via the 1079 * network rather than a local operation? 1080 */ 1081 if (cnp->cn_flags & MAKEENTRY) 1082 cache_enter(dvp, NULL, cnp); 1083 } 1084 return (error); 1085 } 1086 1087 int 1088 coda_remove(struct vop_remove_args *ap) 1089 { 1090 /* true args */ 1091 struct vnode *vp = ap->a_vp; 1092 struct vnode *dvp = ap->a_dvp; 1093 struct cnode *cp = VTOC(dvp); 1094 struct componentname *cnp = ap->a_cnp; 1095 struct ucred *cred = cnp->cn_cred; 1096 struct thread *td = cnp->cn_thread; 1097 /* locals */ 1098 int error; 1099 const char *nm = cnp->cn_nameptr; 1100 int len = cnp->cn_namelen; 1101 #if 0 1102 struct cnode *tp; 1103 #endif 1104 1105 MARK_ENTRY(CODA_REMOVE_STATS); 1106 CODADEBUG(CODA_REMOVE, myprintf(("remove: %s in %s\n", nm, 1107 coda_f2s(&cp->c_fid)));); 1108 1109 /* 1110 * Check for remove of control object. 1111 */ 1112 if (IS_CTL_NAME(dvp, nm, len)) { 1113 MARK_INT_FAIL(CODA_REMOVE_STATS); 1114 return (ENOENT); 1115 } 1116 1117 /* 1118 * Invalidate the parent's attr cache, the modification time has 1119 * changed. We don't yet know if the last reference to the file is 1120 * being removed, but we do know the reference count on the child has 1121 * changed, so invalidate its attr cache also. 1122 */ 1123 VTOC(dvp)->c_flags &= ~C_VATTR; 1124 VTOC(vp)->c_flags &= ~(C_VATTR | C_ACCCACHE); 1125 error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, 1126 td->td_proc); 1127 cache_purge(vp); 1128 CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error));); 1129 return (error); 1130 } 1131 1132 int 1133 coda_link(struct vop_link_args *ap) 1134 { 1135 /* true args */ 1136 struct vnode *vp = ap->a_vp; 1137 struct cnode *cp = VTOC(vp); 1138 struct vnode *tdvp = ap->a_tdvp; 1139 struct cnode *tdcp = VTOC(tdvp); 1140 struct componentname *cnp = ap->a_cnp; 1141 struct ucred *cred = cnp->cn_cred; 1142 struct thread *td = cnp->cn_thread; 1143 /* locals */ 1144 int error; 1145 const char *nm = cnp->cn_nameptr; 1146 int len = cnp->cn_namelen; 1147 1148 MARK_ENTRY(CODA_LINK_STATS); 1149 1150 if (codadebug & CODADBGMSK(CODA_LINK)) { 1151 myprintf(("nb_link: vp fid: %s\n", coda_f2s(&cp->c_fid))); 1152 myprintf(("nb_link: tdvp fid: %s)\n", 1153 coda_f2s(&tdcp->c_fid))); 1154 } 1155 if (codadebug & CODADBGMSK(CODA_LINK)) { 1156 myprintf(("link: vp fid: %s\n", coda_f2s(&cp->c_fid))); 1157 myprintf(("link: tdvp fid: %s\n", coda_f2s(&tdcp->c_fid))); 1158 } 1159 1160 /* 1161 * Check for link to/from control object. 1162 */ 1163 if (IS_CTL_NAME(tdvp, nm, len) || IS_CTL_VP(vp)) { 1164 MARK_INT_FAIL(CODA_LINK_STATS); 1165 return (EACCES); 1166 } 1167 error = venus_link(vtomi(vp), &cp->c_fid, &tdcp->c_fid, nm, len, 1168 cred, td->td_proc); 1169 1170 /* 1171 * Invalidate the parent's attr cache, the modification time has 1172 * changed. 1173 */ 1174 VTOC(tdvp)->c_flags &= ~C_VATTR; 1175 VTOC(vp)->c_flags &= ~C_VATTR; 1176 CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error));); 1177 return (error); 1178 } 1179 1180 int 1181 coda_rename(struct vop_rename_args *ap) 1182 { 1183 /* true args */ 1184 struct vnode *fvp = ap->a_fvp; 1185 struct vnode *tvp = ap->a_tvp; 1186 struct vnode *odvp = ap->a_fdvp; 1187 struct cnode *odcp = VTOC(odvp); 1188 struct componentname *fcnp = ap->a_fcnp; 1189 struct vnode *ndvp = ap->a_tdvp; 1190 struct cnode *ndcp = VTOC(ndvp); 1191 struct componentname *tcnp = ap->a_tcnp; 1192 struct ucred *cred = fcnp->cn_cred; 1193 struct thread *td = fcnp->cn_thread; 1194 /* true args */ 1195 int error; 1196 const char *fnm = fcnp->cn_nameptr; 1197 int flen = fcnp->cn_namelen; 1198 const char *tnm = tcnp->cn_nameptr; 1199 int tlen = tcnp->cn_namelen; 1200 1201 MARK_ENTRY(CODA_RENAME_STATS); 1202 1203 /* 1204 * Check for rename involving control object. 1205 */ 1206 if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { 1207 MARK_INT_FAIL(CODA_RENAME_STATS); 1208 return (EACCES); 1209 } 1210 1211 /* 1212 * Remove the entries for both source and target directories, which 1213 * should catch references to the children. Perhaps we could purge 1214 * less? 1215 */ 1216 cache_purge(odvp); 1217 cache_purge(ndvp); 1218 1219 /* 1220 * Invalidate parent directories as modification times have changed. 1221 * Invalidate access cache on renamed file as rights may have 1222 * changed. 1223 */ 1224 VTOC(odvp)->c_flags &= ~C_VATTR; 1225 VTOC(ndvp)->c_flags &= ~C_VATTR; 1226 VTOC(fvp)->c_flags &= ~C_ACCCACHE; 1227 if (flen+1 > CODA_MAXNAMLEN) { 1228 MARK_INT_FAIL(CODA_RENAME_STATS); 1229 error = EINVAL; 1230 goto exit; 1231 } 1232 if (tlen+1 > CODA_MAXNAMLEN) { 1233 MARK_INT_FAIL(CODA_RENAME_STATS); 1234 error = EINVAL; 1235 goto exit; 1236 } 1237 error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, 1238 flen, tnm, tlen, cred, td->td_proc); 1239 exit: 1240 CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));); 1241 1242 /* 1243 * Update namecache to reflect that the names of various objects may 1244 * have changed (or gone away entirely). 1245 */ 1246 cache_purge(fvp); 1247 cache_purge(tvp); 1248 1249 /* 1250 * Release parents first, then children. 1251 */ 1252 vrele(odvp); 1253 if (tvp) { 1254 if (tvp == ndvp) 1255 vrele(ndvp); 1256 else 1257 vput(ndvp); 1258 vput(tvp); 1259 } else 1260 vput(ndvp); 1261 vrele(fvp); 1262 return (error); 1263 } 1264 1265 int 1266 coda_mkdir(struct vop_mkdir_args *ap) 1267 { 1268 /* true args */ 1269 struct vnode *dvp = ap->a_dvp; 1270 struct cnode *dcp = VTOC(dvp); 1271 struct componentname *cnp = ap->a_cnp; 1272 struct vattr *va = ap->a_vap; 1273 struct vnode **vpp = ap->a_vpp; 1274 struct ucred *cred = cnp->cn_cred; 1275 struct thread *td = cnp->cn_thread; 1276 /* locals */ 1277 int error; 1278 const char *nm = cnp->cn_nameptr; 1279 int len = cnp->cn_namelen; 1280 struct cnode *cp; 1281 struct CodaFid VFid; 1282 struct vattr ova; 1283 1284 MARK_ENTRY(CODA_MKDIR_STATS); 1285 1286 /* 1287 * Check for mkdir of target object. 1288 */ 1289 if (IS_CTL_NAME(dvp, nm, len)) { 1290 *vpp = (struct vnode *)0; 1291 MARK_INT_FAIL(CODA_MKDIR_STATS); 1292 return (EACCES); 1293 } 1294 if (len+1 > CODA_MAXNAMLEN) { 1295 *vpp = (struct vnode *)0; 1296 MARK_INT_FAIL(CODA_MKDIR_STATS); 1297 return (EACCES); 1298 } 1299 error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, 1300 td->td_proc, &VFid, &ova); 1301 if (!error) { 1302 if (coda_find(&VFid) != NULL) 1303 panic("cnode existed for newly created directory!"); 1304 cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); 1305 *vpp = CTOV(cp); 1306 1307 /* 1308 * Enter the new vnode in the Name Cache. 1309 */ 1310 if (cnp->cn_flags & MAKEENTRY) 1311 cache_enter(dvp, *vpp, cnp); 1312 1313 /* 1314 * Update the attr cache and mark as valid. 1315 */ 1316 if (coda_attr_cache) { 1317 VTOC(*vpp)->c_vattr = ova; 1318 VTOC(*vpp)->c_flags |= C_VATTR; 1319 } 1320 1321 /* 1322 * Invalidate the parent's attr cache, the modification time 1323 * has changed. 1324 */ 1325 VTOC(dvp)->c_flags &= ~C_VATTR; 1326 vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY); 1327 CODADEBUG( CODA_MKDIR, myprintf(("mkdir: %s result %d\n", 1328 coda_f2s(&VFid), error));); 1329 } else { 1330 *vpp = NULL; 1331 CODADEBUG(CODA_MKDIR, myprintf(("mkdir error %d\n",error));); 1332 } 1333 return (error); 1334 } 1335 1336 int 1337 coda_rmdir(struct vop_rmdir_args *ap) 1338 { 1339 /* true args */ 1340 struct vnode *vp = ap->a_vp; 1341 struct vnode *dvp = ap->a_dvp; 1342 struct cnode *dcp = VTOC(dvp); 1343 struct componentname *cnp = ap->a_cnp; 1344 struct ucred *cred = cnp->cn_cred; 1345 struct thread *td = cnp->cn_thread; 1346 /* true args */ 1347 int error; 1348 const char *nm = cnp->cn_nameptr; 1349 int len = cnp->cn_namelen; 1350 #if 0 1351 struct cnode *cp; 1352 #endif 1353 1354 MARK_ENTRY(CODA_RMDIR_STATS); 1355 1356 /* 1357 * Check for rmdir of control object. 1358 */ 1359 if (IS_CTL_NAME(dvp, nm, len)) { 1360 MARK_INT_FAIL(CODA_RMDIR_STATS); 1361 return (ENOENT); 1362 } 1363 1364 /* 1365 * Possibly somewhat conservative purging, perhaps we just need to 1366 * purge vp? 1367 */ 1368 cache_purge(dvp); 1369 cache_purge(vp); 1370 1371 /* 1372 * Invalidate the parent's attr cache, the modification time has 1373 * changed. 1374 */ 1375 dcp->c_flags &= ~C_VATTR; 1376 error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, 1377 td->td_proc); 1378 CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error));); 1379 return (error); 1380 } 1381 1382 int 1383 coda_symlink(struct vop_symlink_args *ap) 1384 { 1385 /* true args */ 1386 struct vnode *tdvp = ap->a_dvp; 1387 struct cnode *tdcp = VTOC(tdvp); 1388 struct componentname *cnp = ap->a_cnp; 1389 struct vattr *tva = ap->a_vap; 1390 char *path = ap->a_target; 1391 struct ucred *cred = cnp->cn_cred; 1392 struct thread *td = cnp->cn_thread; 1393 struct vnode **vpp = ap->a_vpp; 1394 /* locals */ 1395 int error; 1396 1397 /*- 1398 * XXX I'm assuming the following things about coda_symlink's 1399 * arguments: 1400 * t(foo) is the new name/parent/etc being created. 1401 * lname is the contents of the new symlink. 1402 */ 1403 char *nm = cnp->cn_nameptr; 1404 int len = cnp->cn_namelen; 1405 int plen = strlen(path); 1406 1407 /* 1408 * Here's the strategy for the moment: perform the symlink, then do a 1409 * lookup to grab the resulting vnode. I know this requires two 1410 * communications with Venus for a new sybolic link, but that's the 1411 * way the ball bounces. I don't yet want to change the way the Mach 1412 * symlink works. When Mach support is deprecated, we should change 1413 * symlink so that the common case returns the resultant vnode in a 1414 * vpp argument. 1415 */ 1416 MARK_ENTRY(CODA_SYMLINK_STATS); 1417 1418 /* 1419 * Check for symlink of control object. 1420 */ 1421 if (IS_CTL_NAME(tdvp, nm, len)) { 1422 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1423 return (EACCES); 1424 } 1425 if (plen+1 > CODA_MAXPATHLEN) { 1426 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1427 return (EINVAL); 1428 } 1429 if (len+1 > CODA_MAXNAMLEN) { 1430 MARK_INT_FAIL(CODA_SYMLINK_STATS); 1431 error = EINVAL; 1432 goto exit; 1433 } 1434 error = venus_symlink(vtomi(tdvp), &tdcp->c_fid, path, plen, nm, len, 1435 tva, cred, td->td_proc); 1436 1437 /* 1438 * Invalidate the parent's attr cache, the modification time has 1439 * changed. 1440 */ 1441 tdcp->c_flags &= ~C_VATTR; 1442 if (error == 0) 1443 error = VOP_LOOKUP(tdvp, vpp, cnp); 1444 exit: 1445 CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error));); 1446 return (error); 1447 } 1448 1449 /* 1450 * Read directory entries. 1451 * 1452 * XXX: This forwards the operator straight to the cache vnode using 1453 * VOP_READDIR(), rather than calling venus_readdir(). Why? 1454 */ 1455 int 1456 coda_readdir(struct vop_readdir_args *ap) 1457 { 1458 /* true args */ 1459 struct vnode *vp = ap->a_vp; 1460 struct cnode *cp = VTOC(vp); 1461 struct uio *uiop = ap->a_uio; 1462 struct ucred *cred = ap->a_cred; 1463 int *eofflag = ap->a_eofflag; 1464 u_long **cookies = ap->a_cookies; 1465 int *ncookies = ap->a_ncookies; 1466 struct thread *td = ap->a_uio->uio_td; 1467 /* upcall decl */ 1468 /* locals */ 1469 int error = 0; 1470 int opened_internally = 0; 1471 1472 MARK_ENTRY(CODA_READDIR_STATS); 1473 CODADEBUG(CODA_READDIR, myprintf(("coda_readdir(%p, %zd, %lld, %d)\n", 1474 (void *)uiop->uio_iov->iov_base, uiop->uio_resid, 1475 (long long)uiop->uio_offset, uiop->uio_segflg));); 1476 1477 /* 1478 * Check for readdir of control object. 1479 */ 1480 if (IS_CTL_VP(vp)) { 1481 MARK_INT_FAIL(CODA_READDIR_STATS); 1482 return (ENOENT); 1483 } 1484 1485 /* 1486 * If directory is not already open do an "internal open" on it. 1487 * 1488 * XXX: Why would this happen? For files, there's memory mapping, 1489 * execution, and other kernel access paths such as ktrace. For 1490 * directories, it is less clear. 1491 */ 1492 if (cp->c_ovp == NULL) { 1493 opened_internally = 1; 1494 MARK_INT_GEN(CODA_OPEN_STATS); 1495 error = VOP_OPEN(vp, FREAD, cred, td, NULL); 1496 printf("coda_readdir: Internally Opening %p\n", vp); 1497 if (error) { 1498 printf("coda_readdir: VOP_OPEN on container failed " 1499 "%d\n", error); 1500 return (error); 1501 } 1502 } 1503 1504 /* 1505 * Have UFS handle the call. 1506 */ 1507 CODADEBUG(CODA_READDIR, myprintf(("indirect readdir: fid = %s, " 1508 "refcnt = %d\n", coda_f2s(&cp->c_fid), vp->v_usecount));); 1509 vn_lock(cp->c_ovp, LK_SHARED | LK_RETRY); 1510 error = VOP_READDIR(cp->c_ovp, uiop, cred, eofflag, ncookies, 1511 cookies); 1512 VOP_UNLOCK(cp->c_ovp, 0); 1513 if (error) 1514 MARK_INT_FAIL(CODA_READDIR_STATS); 1515 else 1516 MARK_INT_SAT(CODA_READDIR_STATS); 1517 1518 /* 1519 * Do an "internal close" if necessary. 1520 */ 1521 if (opened_internally) { 1522 MARK_INT_GEN(CODA_CLOSE_STATS); 1523 (void)VOP_CLOSE(vp, FREAD, cred, td); 1524 } 1525 return (error); 1526 } 1527 1528 int 1529 coda_reclaim(struct vop_reclaim_args *ap) 1530 { 1531 /* true args */ 1532 struct vnode *vp = ap->a_vp; 1533 struct cnode *cp = VTOC(vp); 1534 /* upcall decl */ 1535 /* locals */ 1536 1537 /* 1538 * Forced unmount/flush will let vnodes with non-zero use be 1539 * destroyed! 1540 */ 1541 ENTRY; 1542 1543 if (IS_UNMOUNTING(cp)) { 1544 #ifdef DEBUG 1545 if (VTOC(vp)->c_ovp) { 1546 if (IS_UNMOUNTING(cp)) 1547 printf("coda_reclaim: c_ovp not void: vp " 1548 "%p, cp %p\n", vp, cp); 1549 } 1550 #endif 1551 } 1552 cache_purge(vp); 1553 coda_free(VTOC(vp)); 1554 vp->v_data = NULL; 1555 vp->v_object = NULL; 1556 return (0); 1557 } 1558 1559 int 1560 coda_lock(struct vop_lock1_args *ap) 1561 { 1562 /* true args */ 1563 struct vnode *vp = ap->a_vp; 1564 struct cnode *cp = VTOC(vp); 1565 /* upcall decl */ 1566 /* locals */ 1567 1568 ENTRY; 1569 if ((ap->a_flags & LK_INTERLOCK) == 0) { 1570 VI_LOCK(vp); 1571 ap->a_flags |= LK_INTERLOCK; 1572 } 1573 if (coda_lockdebug) 1574 myprintf(("Attempting lock on %s\n", coda_f2s(&cp->c_fid))); 1575 return (vop_stdlock(ap)); 1576 } 1577 1578 int 1579 coda_unlock(struct vop_unlock_args *ap) 1580 { 1581 /* true args */ 1582 struct vnode *vp = ap->a_vp; 1583 struct cnode *cp = VTOC(vp); 1584 /* upcall decl */ 1585 /* locals */ 1586 1587 ENTRY; 1588 if (coda_lockdebug) 1589 myprintf(("Attempting unlock on %s\n", 1590 coda_f2s(&cp->c_fid))); 1591 return (vop_stdunlock(ap)); 1592 } 1593 1594 int 1595 coda_islocked(struct vop_islocked_args *ap) 1596 { 1597 /* true args */ 1598 1599 ENTRY; 1600 return (vop_stdislocked(ap)); 1601 } 1602 1603 static void 1604 coda_print_vattr(struct vattr *attr) 1605 { 1606 char *typestr; 1607 1608 switch (attr->va_type) { 1609 case VNON: 1610 typestr = "VNON"; 1611 break; 1612 1613 case VREG: 1614 typestr = "VREG"; 1615 break; 1616 1617 case VDIR: 1618 typestr = "VDIR"; 1619 break; 1620 1621 case VBLK: 1622 typestr = "VBLK"; 1623 break; 1624 1625 case VCHR: 1626 typestr = "VCHR"; 1627 break; 1628 1629 case VLNK: 1630 typestr = "VLNK"; 1631 break; 1632 1633 case VSOCK: 1634 typestr = "VSCK"; 1635 break; 1636 1637 case VFIFO: 1638 typestr = "VFFO"; 1639 break; 1640 1641 case VBAD: 1642 typestr = "VBAD"; 1643 break; 1644 1645 default: 1646 typestr = "????"; 1647 break; 1648 } 1649 myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n", 1650 typestr, (int)attr->va_mode, (int)attr->va_uid, 1651 (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); 1652 myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n", 1653 (int)attr->va_fileid, (int)attr->va_nlink, (int)attr->va_size, 1654 (int)attr->va_blocksize,(int)attr->va_bytes)); 1655 myprintf((" gen %ld flags %ld vaflags %d\n", attr->va_gen, 1656 attr->va_flags, attr->va_vaflags)); 1657 myprintf((" atime sec %d nsec %d\n", (int)attr->va_atime.tv_sec, 1658 (int)attr->va_atime.tv_nsec)); 1659 myprintf((" mtime sec %d nsec %d\n", (int)attr->va_mtime.tv_sec, 1660 (int)attr->va_mtime.tv_nsec)); 1661 myprintf((" ctime sec %d nsec %d\n", (int)attr->va_ctime.tv_sec, 1662 (int)attr->va_ctime.tv_nsec)); 1663 } 1664 1665 /* 1666 * How to print a ucred. 1667 */ 1668 void 1669 coda_print_cred(struct ucred *cred) 1670 { 1671 int i; 1672 1673 myprintf(("ref %d\tuid %d\n",cred->cr_ref,cred->cr_uid)); 1674 for (i=0; i < cred->cr_ngroups; i++) 1675 myprintf(("\tgroup %d: (%d)\n",i,cred->cr_groups[i])); 1676 myprintf(("\n")); 1677 } 1678 1679 /* 1680 * Return a vnode for the given fid. If no cnode exists for this fid create 1681 * one and put it in a table hashed by coda_f2i(). If the cnode for this fid 1682 * is already in the table return it (ref count is incremented by coda_find. 1683 * The cnode will be flushed from the table when coda_inactive calls 1684 * coda_unsave. 1685 */ 1686 struct cnode * 1687 make_coda_node(struct CodaFid *fid, struct mount *vfsp, short type) 1688 { 1689 struct cnode *cp; 1690 struct vnode *vp; 1691 int err; 1692 1693 /* 1694 * XXXRW: This really needs a moderate amount of reworking. We need 1695 * to properly tolerate failures of getnewvnode() and insmntque(), 1696 * and callers need to be able to accept an error back from 1697 * make_coda_node. There may also be more general issues in how we 1698 * handle forced unmount. Finally, if/when Coda loses its dependency 1699 * on Giant, the ordering of this needs rethinking. 1700 */ 1701 cp = coda_find(fid); 1702 if (cp != NULL) { 1703 vref(CTOV(cp)); 1704 return (cp); 1705 } 1706 cp = coda_alloc(); 1707 cp->c_fid = *fid; 1708 err = getnewvnode("coda", vfsp, &coda_vnodeops, &vp); 1709 if (err) 1710 panic("coda: getnewvnode returned error %d\n", err); 1711 vp->v_data = cp; 1712 vp->v_type = type; 1713 cp->c_vnode = vp; 1714 coda_save(cp); 1715 err = insmntque(vp, vfsp); 1716 if (err != 0) 1717 printf("coda: insmntque failed: error %d", err); 1718 return (cp); 1719 } 1720 1721 int 1722 coda_pathconf(struct vop_pathconf_args *ap) 1723 { 1724 1725 switch (ap->a_name) { 1726 case _PC_NAME_MAX: 1727 *ap->a_retval = CODA_MAXNAMLEN; 1728 return (0); 1729 1730 case _PC_PATH_MAX: 1731 *ap->a_retval = CODA_MAXPATHLEN; 1732 return (0); 1733 1734 default: 1735 return (vop_stdpathconf(ap)); 1736 } 1737 }
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