1 0 stevel /* 2 0 stevel * CDDL HEADER START 3 0 stevel * 4 0 stevel * The contents of this file are subject to the terms of the 5 4530 vv149972 * Common Development and Distribution License (the "License"). 6 4530 vv149972 * You may not use this file except in compliance with the License. 7 0 stevel * 8 0 stevel * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 0 stevel * or http://www.opensolaris.org/os/licensing. 10 0 stevel * See the License for the specific language governing permissions 11 0 stevel * and limitations under the License. 12 0 stevel * 13 0 stevel * When distributing Covered Code, include this CDDL HEADER in each 14 0 stevel * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 0 stevel * If applicable, add the following below this CDDL HEADER, with the 16 0 stevel * fields enclosed by brackets "[]" replaced with your own identifying 17 0 stevel * information: Portions Copyright [yyyy] [name of copyright owner] 18 0 stevel * 19 0 stevel * CDDL HEADER END 20 0 stevel */ 21 0 stevel /* 22 9668 Casper * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 0 stevel * Use is subject to license terms. 24 0 stevel */ 25 0 stevel 26 0 stevel /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 27 0 stevel /* All Rights Reserved */ 28 0 stevel 29 0 stevel /* 30 0 stevel * University Copyright- Copyright (c) 1982, 1986, 1988 31 0 stevel * The Regents of the University of California 32 0 stevel * All Rights Reserved 33 0 stevel * 34 0 stevel * University Acknowledgment- Portions of this document are derived from 35 0 stevel * software developed by the University of California, Berkeley, and its 36 0 stevel * contributors. 37 0 stevel */ 38 0 stevel 39 0 stevel #include <sys/types.h> 40 0 stevel #include <sys/param.h> 41 0 stevel #include <sys/systm.h> 42 0 stevel #include <sys/cpuvar.h> 43 0 stevel #include <sys/errno.h> 44 0 stevel #include <sys/cred.h> 45 0 stevel #include <sys/user.h> 46 0 stevel #include <sys/uio.h> 47 0 stevel #include <sys/vfs.h> 48 0 stevel #include <sys/vnode.h> 49 0 stevel #include <sys/pathname.h> 50 0 stevel #include <sys/proc.h> 51 0 stevel #include <sys/vtrace.h> 52 0 stevel #include <sys/sysmacros.h> 53 0 stevel #include <sys/debug.h> 54 0 stevel #include <sys/dirent.h> 55 0 stevel #include <c2/audit.h> 56 0 stevel #include <sys/zone.h> 57 0 stevel #include <sys/dnlc.h> 58 0 stevel #include <sys/fs/snode.h> 59 0 stevel 60 0 stevel /* Controls whether paths are stored with vnodes. */ 61 0 stevel int vfs_vnode_path = 1; 62 0 stevel 63 0 stevel int 64 0 stevel lookupname( 65 0 stevel char *fnamep, 66 0 stevel enum uio_seg seg, 67 0 stevel enum symfollow followlink, 68 0 stevel vnode_t **dirvpp, 69 0 stevel vnode_t **compvpp) 70 0 stevel { 71 9668 Casper return (lookupnameatcred(fnamep, seg, followlink, dirvpp, compvpp, NULL, 72 9668 Casper CRED())); 73 0 stevel } 74 0 stevel 75 0 stevel /* 76 0 stevel * Lookup the user file name, 77 0 stevel * Handle allocation and freeing of pathname buffer, return error. 78 0 stevel */ 79 0 stevel int 80 9668 Casper lookupnameatcred( 81 0 stevel char *fnamep, /* user pathname */ 82 0 stevel enum uio_seg seg, /* addr space that name is in */ 83 0 stevel enum symfollow followlink, /* follow sym links */ 84 0 stevel vnode_t **dirvpp, /* ret for ptr to parent dir vnode */ 85 0 stevel vnode_t **compvpp, /* ret for ptr to component vnode */ 86 9668 Casper vnode_t *startvp, /* start path search from vp */ 87 9668 Casper cred_t *cr) /* credential */ 88 0 stevel { 89 0 stevel char namebuf[TYPICALMAXPATHLEN]; 90 0 stevel struct pathname lookpn; 91 0 stevel int error; 92 0 stevel 93 0 stevel error = pn_get_buf(fnamep, seg, &lookpn, namebuf, sizeof (namebuf)); 94 0 stevel if (error == 0) { 95 0 stevel if (audit_active) 96 0 stevel audit_lookupname(); 97 9668 Casper error = lookuppnatcred(&lookpn, NULL, followlink, 98 9668 Casper dirvpp, compvpp, startvp, cr); 99 0 stevel } 100 0 stevel if (error == ENAMETOOLONG) { 101 0 stevel /* 102 0 stevel * This thread used a pathname > TYPICALMAXPATHLEN bytes long. 103 0 stevel */ 104 0 stevel if (error = pn_get(fnamep, seg, &lookpn)) 105 0 stevel return (error); 106 9668 Casper error = lookuppnatcred(&lookpn, NULL, followlink, 107 9668 Casper dirvpp, compvpp, startvp, cr); 108 0 stevel pn_free(&lookpn); 109 0 stevel } 110 0 stevel 111 0 stevel return (error); 112 0 stevel } 113 0 stevel 114 9668 Casper int 115 9668 Casper lookupnameat(char *fnamep, enum uio_seg seg, enum symfollow followlink, 116 9668 Casper vnode_t **dirvpp, vnode_t **compvpp, vnode_t *startvp) 117 9668 Casper { 118 9668 Casper return (lookupnameatcred(fnamep, seg, followlink, dirvpp, compvpp, 119 9668 Casper startvp, CRED())); 120 9668 Casper } 121 9668 Casper 122 0 stevel int 123 0 stevel lookuppn( 124 0 stevel struct pathname *pnp, 125 0 stevel struct pathname *rpnp, 126 0 stevel enum symfollow followlink, 127 0 stevel vnode_t **dirvpp, 128 0 stevel vnode_t **compvpp) 129 0 stevel { 130 9668 Casper return (lookuppnatcred(pnp, rpnp, followlink, dirvpp, compvpp, NULL, 131 9668 Casper CRED())); 132 0 stevel } 133 0 stevel 134 9668 Casper /* 135 9668 Casper * Lookup the user file name from a given vp, using a specific credential. 136 9668 Casper */ 137 0 stevel int 138 9668 Casper lookuppnatcred( 139 0 stevel struct pathname *pnp, /* pathname to lookup */ 140 0 stevel struct pathname *rpnp, /* if non-NULL, return resolved path */ 141 0 stevel enum symfollow followlink, /* (don't) follow sym links */ 142 0 stevel vnode_t **dirvpp, /* ptr for parent vnode */ 143 0 stevel vnode_t **compvpp, /* ptr for entry vnode */ 144 9668 Casper vnode_t *startvp, /* start search from this vp */ 145 9668 Casper cred_t *cr) /* user credential */ 146 0 stevel { 147 0 stevel vnode_t *vp; /* current directory vp */ 148 0 stevel vnode_t *rootvp; 149 0 stevel proc_t *p = curproc; 150 0 stevel 151 0 stevel if (pnp->pn_pathlen == 0) 152 0 stevel return (ENOENT); 153 0 stevel 154 0 stevel mutex_enter(&p->p_lock); /* for u_rdir and u_cdir */ 155 0 stevel if ((rootvp = PTOU(p)->u_rdir) == NULL) 156 0 stevel rootvp = rootdir; 157 0 stevel else if (rootvp != rootdir) /* no need to VN_HOLD rootdir */ 158 0 stevel VN_HOLD(rootvp); 159 0 stevel 160 0 stevel if (pnp->pn_path[0] == '/') { 161 0 stevel vp = rootvp; 162 0 stevel } else { 163 0 stevel vp = (startvp == NULL) ? PTOU(p)->u_cdir : startvp; 164 0 stevel } 165 0 stevel VN_HOLD(vp); 166 0 stevel mutex_exit(&p->p_lock); 167 0 stevel 168 0 stevel /* 169 0 stevel * Skip over leading slashes 170 0 stevel */ 171 0 stevel if (pnp->pn_path[0] == '/') { 172 0 stevel do { 173 0 stevel pnp->pn_path++; 174 0 stevel pnp->pn_pathlen--; 175 0 stevel } while (pnp->pn_path[0] == '/'); 176 0 stevel } 177 0 stevel 178 0 stevel return (lookuppnvp(pnp, rpnp, followlink, dirvpp, 179 9668 Casper compvpp, rootvp, vp, cr)); 180 9668 Casper } 181 9668 Casper 182 9668 Casper int 183 9668 Casper lookuppnat(struct pathname *pnp, struct pathname *rpnp, 184 9668 Casper enum symfollow followlink, vnode_t **dirvpp, vnode_t **compvpp, 185 9668 Casper vnode_t *startvp) 186 9668 Casper { 187 9668 Casper return (lookuppnatcred(pnp, rpnp, followlink, dirvpp, compvpp, startvp, 188 9668 Casper CRED())); 189 0 stevel } 190 0 stevel 191 0 stevel /* Private flag to do our getcwd() dirty work */ 192 0 stevel #define LOOKUP_CHECKREAD 0x10 193 0 stevel #define LOOKUP_MASK (~LOOKUP_CHECKREAD) 194 0 stevel 195 0 stevel /* 196 0 stevel * Starting at current directory, translate pathname pnp to end. 197 0 stevel * Leave pathname of final component in pnp, return the vnode 198 0 stevel * for the final component in *compvpp, and return the vnode 199 0 stevel * for the parent of the final component in dirvpp. 200 0 stevel * 201 0 stevel * This is the central routine in pathname translation and handles 202 0 stevel * multiple components in pathnames, separating them at /'s. It also 203 0 stevel * implements mounted file systems and processes symbolic links. 204 0 stevel * 205 0 stevel * vp is the vnode where the directory search should start. 206 0 stevel * 207 0 stevel * Reference counts: vp must be held prior to calling this function. rootvp 208 0 stevel * should only be held if rootvp != rootdir. 209 0 stevel */ 210 0 stevel int 211 0 stevel lookuppnvp( 212 0 stevel struct pathname *pnp, /* pathname to lookup */ 213 0 stevel struct pathname *rpnp, /* if non-NULL, return resolved path */ 214 0 stevel int flags, /* follow symlinks */ 215 0 stevel vnode_t **dirvpp, /* ptr for parent vnode */ 216 0 stevel vnode_t **compvpp, /* ptr for entry vnode */ 217 0 stevel vnode_t *rootvp, /* rootvp */ 218 0 stevel vnode_t *vp, /* directory to start search at */ 219 0 stevel cred_t *cr) /* user's credential */ 220 0 stevel { 221 0 stevel vnode_t *cvp; /* current component vp */ 222 0 stevel vnode_t *tvp; /* addressable temp ptr */ 223 0 stevel char component[MAXNAMELEN]; /* buffer for component (incl null) */ 224 0 stevel int error; 225 0 stevel int nlink; 226 0 stevel int lookup_flags; 227 5331 amw struct pathname presrvd; /* case preserved name */ 228 5331 amw struct pathname *pp = NULL; 229 0 stevel vnode_t *startvp; 230 0 stevel vnode_t *zonevp = curproc->p_zone->zone_rootvp; /* zone root */ 231 0 stevel int must_be_directory = 0; 232 11089 Vallish boolean_t retry_with_kcred; 233 0 stevel 234 0 stevel CPU_STATS_ADDQ(CPU, sys, namei, 1); 235 0 stevel nlink = 0; 236 0 stevel cvp = NULL; 237 0 stevel if (rpnp) 238 0 stevel rpnp->pn_pathlen = 0; 239 5331 amw 240 0 stevel lookup_flags = dirvpp ? LOOKUP_DIR : 0; 241 5331 amw if (flags & FIGNORECASE) { 242 5331 amw lookup_flags |= FIGNORECASE; 243 5331 amw pn_alloc(&presrvd); 244 5331 amw pp = &presrvd; 245 5331 amw } 246 5331 amw 247 0 stevel if (audit_active) 248 0 stevel audit_anchorpath(pnp, vp == rootvp); 249 0 stevel 250 0 stevel /* 251 0 stevel * Eliminate any trailing slashes in the pathname. 252 0 stevel * If there are any, we must follow all symlinks. 253 0 stevel * Also, we must guarantee that the last component is a directory. 254 0 stevel */ 255 0 stevel if (pn_fixslash(pnp)) { 256 0 stevel flags |= FOLLOW; 257 0 stevel must_be_directory = 1; 258 0 stevel } 259 0 stevel 260 0 stevel startvp = vp; 261 0 stevel next: 262 11089 Vallish retry_with_kcred = B_FALSE; 263 11089 Vallish 264 0 stevel /* 265 0 stevel * Make sure we have a directory. 266 0 stevel */ 267 0 stevel if (vp->v_type != VDIR) { 268 0 stevel error = ENOTDIR; 269 0 stevel goto bad; 270 0 stevel } 271 0 stevel 272 0 stevel if (rpnp && VN_CMP(vp, rootvp)) 273 0 stevel (void) pn_set(rpnp, "/"); 274 0 stevel 275 0 stevel /* 276 0 stevel * Process the next component of the pathname. 277 0 stevel */ 278 0 stevel if (error = pn_getcomponent(pnp, component)) { 279 0 stevel if (audit_active) 280 0 stevel audit_addcomponent(pnp); 281 0 stevel goto bad; 282 0 stevel } 283 0 stevel 284 0 stevel /* 285 0 stevel * Handle "..": two special cases. 286 0 stevel * 1. If we're at the root directory (e.g. after chroot or 287 0 stevel * zone_enter) then change ".." to "." so we can't get 288 0 stevel * out of this subtree. 289 0 stevel * 2. If this vnode is the root of a mounted file system, 290 0 stevel * then replace it with the vnode that was mounted on 291 0 stevel * so that we take the ".." in the other file system. 292 0 stevel */ 293 0 stevel if (component[0] == '.' && component[1] == '.' && component[2] == 0) { 294 0 stevel checkforroot: 295 0 stevel if (VN_CMP(vp, rootvp) || VN_CMP(vp, zonevp)) { 296 0 stevel component[1] = '\0'; 297 0 stevel } else if (vp->v_flag & VROOT) { 298 0 stevel vfs_t *vfsp; 299 0 stevel cvp = vp; 300 0 stevel 301 0 stevel /* 302 0 stevel * While we deal with the vfs pointer from the vnode 303 0 stevel * the filesystem could have been forcefully unmounted 304 0 stevel * and the vnode's v_vfsp could have been invalidated 305 0 stevel * by VFS_UNMOUNT. Hence, we cache v_vfsp and use it 306 0 stevel * with vfs_rlock_wait/vfs_unlock. 307 0 stevel * It is safe to use the v_vfsp even it is freed by 308 0 stevel * VFS_UNMOUNT because vfs_rlock_wait/vfs_unlock 309 0 stevel * do not dereference v_vfsp. It is just used as a 310 0 stevel * magic cookie. 311 0 stevel * One more corner case here is the memory getting 312 0 stevel * reused for another vfs structure. In this case 313 0 stevel * lookuppnvp's vfs_rlock_wait will succeed, domount's 314 0 stevel * vfs_lock will fail and domount will bail out with an 315 0 stevel * error (EBUSY). 316 0 stevel */ 317 0 stevel vfsp = cvp->v_vfsp; 318 0 stevel 319 0 stevel /* 320 0 stevel * This lock is used to synchronize 321 0 stevel * mounts/unmounts and lookups. 322 0 stevel * Threads doing mounts/unmounts hold the 323 0 stevel * writers version vfs_lock_wait(). 324 0 stevel */ 325 0 stevel 326 0 stevel vfs_rlock_wait(vfsp); 327 0 stevel 328 0 stevel /* 329 0 stevel * If this vnode is on a file system that 330 0 stevel * has been forcibly unmounted, 331 0 stevel * we can't proceed. Cancel this operation 332 0 stevel * and return EIO. 333 0 stevel * 334 0 stevel * vfs_vnodecovered is NULL if unmounted. 335 0 stevel * Currently, nfs uses VFS_UNMOUNTED to 336 0 stevel * check if it's a forced-umount. Keep the 337 0 stevel * same checking here as well even though it 338 0 stevel * may not be needed. 339 0 stevel */ 340 0 stevel if (((vp = cvp->v_vfsp->vfs_vnodecovered) == NULL) || 341 0 stevel (cvp->v_vfsp->vfs_flag & VFS_UNMOUNTED)) { 342 0 stevel vfs_unlock(vfsp); 343 0 stevel VN_RELE(cvp); 344 5331 amw if (pp) 345 5331 amw pn_free(pp); 346 0 stevel return (EIO); 347 0 stevel } 348 0 stevel VN_HOLD(vp); 349 0 stevel vfs_unlock(vfsp); 350 0 stevel VN_RELE(cvp); 351 0 stevel cvp = NULL; 352 4530 vv149972 /* 353 4530 vv149972 * Crossing mount points. For eg: We are doing 354 4530 vv149972 * a lookup of ".." for file systems root vnode 355 4530 vv149972 * mounted here, and VOP_LOOKUP() (with covered vnode) 356 4530 vv149972 * will be on underlying file systems mount point 357 4530 vv149972 * vnode. Set retry_with_kcred flag as we might end 358 4530 vv149972 * up doing VOP_LOOKUP() with kcred if required. 359 4530 vv149972 */ 360 4530 vv149972 retry_with_kcred = B_TRUE; 361 0 stevel goto checkforroot; 362 0 stevel } 363 0 stevel } 364 0 stevel 365 0 stevel /* 366 0 stevel * LOOKUP_CHECKREAD is a private flag used by vnodetopath() to indicate 367 0 stevel * that we need to have read permission on every directory in the entire 368 0 stevel * path. This is used to ensure that a forward-lookup of a cached value 369 0 stevel * has the same effect as a reverse-lookup when the cached value cannot 370 0 stevel * be found. 371 0 stevel */ 372 0 stevel if ((flags & LOOKUP_CHECKREAD) && 373 5331 amw (error = VOP_ACCESS(vp, VREAD, 0, cr, NULL)) != 0) 374 0 stevel goto bad; 375 0 stevel 376 0 stevel /* 377 0 stevel * Perform a lookup in the current directory. 378 0 stevel */ 379 0 stevel error = VOP_LOOKUP(vp, component, &tvp, pnp, lookup_flags, 380 5331 amw rootvp, cr, NULL, NULL, pp); 381 4530 vv149972 382 4530 vv149972 /* 383 4530 vv149972 * Retry with kcred - If crossing mount points & error is EACCES. 384 4530 vv149972 * 385 4530 vv149972 * If we are crossing mount points here and doing ".." lookup, 386 4530 vv149972 * VOP_LOOKUP() might fail if the underlying file systems 387 4530 vv149972 * mount point has no execute permission. In cases like these, 388 4530 vv149972 * we retry VOP_LOOKUP() by giving as much privilage as possible 389 4530 vv149972 * by passing kcred credentials. 390 4530 vv149972 * 391 4530 vv149972 * In case of hierarchical file systems, passing kcred still may 392 4530 vv149972 * or may not work. 393 4530 vv149972 * For eg: UFS FS --> Mount NFS FS --> Again mount UFS on some 394 4530 vv149972 * directory inside NFS FS. 395 4530 vv149972 */ 396 4530 vv149972 if ((error == EACCES) && retry_with_kcred) 397 4530 vv149972 error = VOP_LOOKUP(vp, component, &tvp, pnp, lookup_flags, 398 5331 amw rootvp, zone_kcred(), NULL, NULL, pp); 399 4530 vv149972 400 0 stevel cvp = tvp; 401 0 stevel if (error) { 402 0 stevel cvp = NULL; 403 0 stevel /* 404 0 stevel * On error, return hard error if 405 0 stevel * (a) we're not at the end of the pathname yet, or 406 0 stevel * (b) the caller didn't want the parent directory, or 407 0 stevel * (c) we failed for some reason other than a missing entry. 408 0 stevel */ 409 0 stevel if (pn_pathleft(pnp) || dirvpp == NULL || error != ENOENT) 410 0 stevel goto bad; 411 0 stevel if (audit_active) { /* directory access */ 412 0 stevel if (error = audit_savepath(pnp, vp, error, cr)) 413 0 stevel goto bad_noaudit; 414 0 stevel } 415 0 stevel pn_setlast(pnp); 416 0 stevel /* 417 0 stevel * We inform the caller that the desired entry must be 418 0 stevel * a directory by adding a '/' to the component name. 419 0 stevel */ 420 0 stevel if (must_be_directory && (error = pn_addslash(pnp)) != 0) 421 0 stevel goto bad; 422 0 stevel *dirvpp = vp; 423 0 stevel if (compvpp != NULL) 424 0 stevel *compvpp = NULL; 425 0 stevel if (rootvp != rootdir) 426 0 stevel VN_RELE(rootvp); 427 5331 amw if (pp) 428 5331 amw pn_free(pp); 429 0 stevel return (0); 430 0 stevel } 431 0 stevel 432 0 stevel /* 433 0 stevel * Traverse mount points. 434 0 stevel * XXX why don't we need to hold a read lock here (call vn_vfsrlock)? 435 0 stevel * What prevents a concurrent update to v_vfsmountedhere? 436 0 stevel * Possible answer: if mounting, we might not see the mount 437 0 stevel * if it is concurrently coming into existence, but that's 438 0 stevel * really not much different from the thread running a bit slower. 439 0 stevel * If unmounting, we may get into traverse() when we shouldn't, 440 0 stevel * but traverse() will catch this case for us. 441 0 stevel * (For this to work, fetching v_vfsmountedhere had better 442 0 stevel * be atomic!) 443 0 stevel */ 444 0 stevel if (vn_mountedvfs(cvp) != NULL) { 445 0 stevel tvp = cvp; 446 0 stevel if ((error = traverse(&tvp)) != 0) { 447 0 stevel /* 448 0 stevel * It is required to assign cvp here, because 449 0 stevel * traverse() will return a held vnode which 450 0 stevel * may different than the vnode that was passed 451 0 stevel * in (even in the error case). If traverse() 452 0 stevel * changes the vnode it releases the original, 453 0 stevel * and holds the new one. 454 0 stevel */ 455 0 stevel cvp = tvp; 456 0 stevel goto bad; 457 0 stevel } 458 0 stevel cvp = tvp; 459 0 stevel } 460 0 stevel 461 0 stevel /* 462 0 stevel * If we hit a symbolic link and there is more path to be 463 0 stevel * translated or this operation does not wish to apply 464 0 stevel * to a link, then place the contents of the link at the 465 0 stevel * front of the remaining pathname. 466 0 stevel */ 467 0 stevel if (cvp->v_type == VLNK && ((flags & FOLLOW) || pn_pathleft(pnp))) { 468 0 stevel struct pathname linkpath; 469 0 stevel if (audit_active) { 470 0 stevel if (error = audit_pathcomp(pnp, cvp, cr)) 471 0 stevel goto bad; 472 0 stevel } 473 0 stevel 474 0 stevel if (++nlink > MAXSYMLINKS) { 475 0 stevel error = ELOOP; 476 0 stevel goto bad; 477 0 stevel } 478 0 stevel pn_alloc(&linkpath); 479 0 stevel if (error = pn_getsymlink(cvp, &linkpath, cr)) { 480 0 stevel pn_free(&linkpath); 481 0 stevel goto bad; 482 0 stevel } 483 0 stevel 484 0 stevel if (audit_active) 485 0 stevel audit_symlink(pnp, &linkpath); 486 0 stevel 487 0 stevel if (pn_pathleft(&linkpath) == 0) 488 0 stevel (void) pn_set(&linkpath, "."); 489 0 stevel error = pn_insert(pnp, &linkpath, strlen(component)); 490 0 stevel pn_free(&linkpath); 491 0 stevel if (error) 492 0 stevel goto bad; 493 0 stevel VN_RELE(cvp); 494 0 stevel cvp = NULL; 495 0 stevel if (pnp->pn_pathlen == 0) { 496 0 stevel error = ENOENT; 497 0 stevel goto bad; 498 0 stevel } 499 0 stevel if (pnp->pn_path[0] == '/') { 500 0 stevel do { 501 0 stevel pnp->pn_path++; 502 0 stevel pnp->pn_pathlen--; 503 0 stevel } while (pnp->pn_path[0] == '/'); 504 0 stevel VN_RELE(vp); 505 0 stevel vp = rootvp; 506 0 stevel VN_HOLD(vp); 507 0 stevel } 508 0 stevel if (audit_active) 509 0 stevel audit_anchorpath(pnp, vp == rootvp); 510 0 stevel if (pn_fixslash(pnp)) { 511 0 stevel flags |= FOLLOW; 512 0 stevel must_be_directory = 1; 513 0 stevel } 514 0 stevel goto next; 515 0 stevel } 516 0 stevel 517 0 stevel /* 518 0 stevel * If rpnp is non-NULL, remember the resolved path name therein. 519 0 stevel * Do not include "." components. Collapse occurrences of 520 0 stevel * "previous/..", so long as "previous" is not itself "..". 521 0 stevel * Exhausting rpnp results in error ENAMETOOLONG. 522 0 stevel */ 523 0 stevel if (rpnp && strcmp(component, ".") != 0) { 524 0 stevel size_t len; 525 0 stevel 526 0 stevel if (strcmp(component, "..") == 0 && 527 0 stevel rpnp->pn_pathlen != 0 && 528 0 stevel !((rpnp->pn_pathlen > 2 && 529 0 stevel strncmp(rpnp->pn_path+rpnp->pn_pathlen-3, "/..", 3) == 0) || 530 0 stevel (rpnp->pn_pathlen == 2 && 531 0 stevel strncmp(rpnp->pn_path, "..", 2) == 0))) { 532 0 stevel while (rpnp->pn_pathlen && 533 0 stevel rpnp->pn_path[rpnp->pn_pathlen-1] != '/') 534 0 stevel rpnp->pn_pathlen--; 535 0 stevel if (rpnp->pn_pathlen > 1) 536 0 stevel rpnp->pn_pathlen--; 537 0 stevel rpnp->pn_path[rpnp->pn_pathlen] = '\0'; 538 0 stevel } else { 539 0 stevel if (rpnp->pn_pathlen != 0 && 540 0 stevel rpnp->pn_path[rpnp->pn_pathlen-1] != '/') 541 0 stevel rpnp->pn_path[rpnp->pn_pathlen++] = '/'; 542 5331 amw if (flags & FIGNORECASE) { 543 5331 amw /* 544 5331 amw * Return the case-preserved name 545 5331 amw * within the resolved path. 546 5331 amw */ 547 6492 timh error = copystr(pp->pn_buf, 548 5331 amw rpnp->pn_path + rpnp->pn_pathlen, 549 5331 amw rpnp->pn_bufsize - rpnp->pn_pathlen, &len); 550 5331 amw } else { 551 5331 amw error = copystr(component, 552 5331 amw rpnp->pn_path + rpnp->pn_pathlen, 553 5331 amw rpnp->pn_bufsize - rpnp->pn_pathlen, &len); 554 5331 amw } 555 0 stevel if (error) /* copystr() returns ENAMETOOLONG */ 556 0 stevel goto bad; 557 0 stevel rpnp->pn_pathlen += (len - 1); 558 0 stevel ASSERT(rpnp->pn_bufsize > rpnp->pn_pathlen); 559 0 stevel } 560 0 stevel } 561 0 stevel 562 0 stevel /* 563 0 stevel * If no more components, return last directory (if wanted) and 564 0 stevel * last component (if wanted). 565 0 stevel */ 566 0 stevel if (pn_pathleft(pnp) == 0) { 567 0 stevel /* 568 0 stevel * If there was a trailing slash in the pathname, 569 0 stevel * make sure the last component is a directory. 570 0 stevel */ 571 0 stevel if (must_be_directory && cvp->v_type != VDIR) { 572 0 stevel error = ENOTDIR; 573 0 stevel goto bad; 574 0 stevel } 575 0 stevel if (dirvpp != NULL) { 576 0 stevel /* 577 0 stevel * Check that we have the real parent and not 578 0 stevel * an alias of the last component. 579 0 stevel */ 580 0 stevel if (vn_compare(vp, cvp)) { 581 0 stevel if (audit_active) 582 0 stevel (void) audit_savepath(pnp, cvp, 583 4530 vv149972 EINVAL, cr); 584 0 stevel pn_setlast(pnp); 585 0 stevel VN_RELE(vp); 586 0 stevel VN_RELE(cvp); 587 0 stevel if (rootvp != rootdir) 588 0 stevel VN_RELE(rootvp); 589 5331 amw if (pp) 590 5331 amw pn_free(pp); 591 0 stevel return (EINVAL); 592 0 stevel } 593 0 stevel if (audit_active) { 594 0 stevel if (error = audit_pathcomp(pnp, vp, cr)) 595 0 stevel goto bad; 596 0 stevel } 597 0 stevel *dirvpp = vp; 598 0 stevel } else 599 0 stevel VN_RELE(vp); 600 0 stevel if (audit_active) 601 0 stevel (void) audit_savepath(pnp, cvp, 0, cr); 602 0 stevel if (pnp->pn_path == pnp->pn_buf) 603 0 stevel (void) pn_set(pnp, "."); 604 0 stevel else 605 0 stevel pn_setlast(pnp); 606 0 stevel if (rpnp) { 607 0 stevel if (VN_CMP(cvp, rootvp)) 608 0 stevel (void) pn_set(rpnp, "/"); 609 0 stevel else if (rpnp->pn_pathlen == 0) 610 0 stevel (void) pn_set(rpnp, "."); 611 0 stevel } 612 0 stevel 613 0 stevel if (compvpp != NULL) 614 0 stevel *compvpp = cvp; 615 0 stevel else 616 0 stevel VN_RELE(cvp); 617 0 stevel if (rootvp != rootdir) 618 0 stevel VN_RELE(rootvp); 619 5331 amw if (pp) 620 5331 amw pn_free(pp); 621 0 stevel return (0); 622 0 stevel } 623 0 stevel 624 0 stevel if (audit_active) { 625 0 stevel if (error = audit_pathcomp(pnp, cvp, cr)) 626 0 stevel goto bad; 627 0 stevel } 628 0 stevel 629 0 stevel /* 630 0 stevel * Skip over slashes from end of last component. 631 0 stevel */ 632 0 stevel while (pnp->pn_path[0] == '/') { 633 0 stevel pnp->pn_path++; 634 0 stevel pnp->pn_pathlen--; 635 0 stevel } 636 0 stevel 637 0 stevel /* 638 0 stevel * Searched through another level of directory: 639 0 stevel * release previous directory handle and save new (result 640 0 stevel * of lookup) as current directory. 641 0 stevel */ 642 0 stevel VN_RELE(vp); 643 0 stevel vp = cvp; 644 0 stevel cvp = NULL; 645 0 stevel goto next; 646 0 stevel 647 0 stevel bad: 648 0 stevel if (audit_active) /* reached end of path */ 649 0 stevel (void) audit_savepath(pnp, cvp, error, cr); 650 0 stevel bad_noaudit: 651 0 stevel /* 652 0 stevel * Error. Release vnodes and return. 653 0 stevel */ 654 0 stevel if (cvp) 655 0 stevel VN_RELE(cvp); 656 0 stevel /* 657 0 stevel * If the error was ESTALE and the current directory to look in 658 0 stevel * was the root for this lookup, the root for a mounted file 659 0 stevel * system, or the starting directory for lookups, then 660 0 stevel * return ENOENT instead of ESTALE. In this case, no recovery 661 0 stevel * is possible by the higher level. If ESTALE was returned for 662 0 stevel * some intermediate directory along the path, then recovery 663 0 stevel * is potentially possible and retrying from the higher level 664 0 stevel * will either correct the situation by purging stale cache 665 0 stevel * entries or eventually get back to the point where no recovery 666 0 stevel * is possible. 667 0 stevel */ 668 0 stevel if (error == ESTALE && 669 0 stevel (VN_CMP(vp, rootvp) || (vp->v_flag & VROOT) || vp == startvp)) 670 0 stevel error = ENOENT; 671 0 stevel VN_RELE(vp); 672 0 stevel if (rootvp != rootdir) 673 0 stevel VN_RELE(rootvp); 674 5331 amw if (pp) 675 5331 amw pn_free(pp); 676 0 stevel return (error); 677 0 stevel } 678 0 stevel 679 0 stevel /* 680 0 stevel * Traverse a mount point. Routine accepts a vnode pointer as a reference 681 0 stevel * parameter and performs the indirection, releasing the original vnode. 682 0 stevel */ 683 0 stevel int 684 0 stevel traverse(vnode_t **cvpp) 685 0 stevel { 686 0 stevel int error = 0; 687 0 stevel vnode_t *cvp; 688 0 stevel vnode_t *tvp; 689 0 stevel vfs_t *vfsp; 690 0 stevel 691 0 stevel cvp = *cvpp; 692 0 stevel 693 0 stevel /* 694 0 stevel * If this vnode is mounted on, then we transparently indirect 695 0 stevel * to the vnode which is the root of the mounted file system. 696 0 stevel * Before we do this we must check that an unmount is not in 697 0 stevel * progress on this vnode. 698 0 stevel */ 699 0 stevel 700 0 stevel for (;;) { 701 0 stevel /* 702 0 stevel * Try to read lock the vnode. If this fails because 703 0 stevel * the vnode is already write locked, then check to 704 0 stevel * see whether it is the current thread which locked 705 0 stevel * the vnode. If it is not, then read lock the vnode 706 0 stevel * by waiting to acquire the lock. 707 0 stevel * 708 0 stevel * The code path in domount() is an example of support 709 0 stevel * which needs to look up two pathnames and locks one 710 0 stevel * of them in between the two lookups. 711 0 stevel */ 712 0 stevel error = vn_vfsrlock(cvp); 713 0 stevel if (error) { 714 0 stevel if (!vn_vfswlock_held(cvp)) 715 0 stevel error = vn_vfsrlock_wait(cvp); 716 0 stevel if (error != 0) { 717 0 stevel /* 718 0 stevel * lookuppn() expects a held vnode to be 719 0 stevel * returned because it promptly calls 720 0 stevel * VN_RELE after the error return 721 0 stevel */ 722 0 stevel *cvpp = cvp; 723 0 stevel return (error); 724 0 stevel } 725 0 stevel } 726 0 stevel 727 0 stevel /* 728 0 stevel * Reached the end of the mount chain? 729 0 stevel */ 730 0 stevel vfsp = vn_mountedvfs(cvp); 731 0 stevel if (vfsp == NULL) { 732 0 stevel vn_vfsunlock(cvp); 733 0 stevel break; 734 0 stevel } 735 0 stevel 736 0 stevel /* 737 0 stevel * The read lock must be held across the call to VFS_ROOT() to 738 0 stevel * prevent a concurrent unmount from destroying the vfs. 739 0 stevel */ 740 0 stevel error = VFS_ROOT(vfsp, &tvp); 741 0 stevel vn_vfsunlock(cvp); 742 0 stevel 743 0 stevel if (error) 744 0 stevel break; 745 0 stevel 746 0 stevel VN_RELE(cvp); 747 0 stevel 748 0 stevel cvp = tvp; 749 0 stevel } 750 0 stevel 751 0 stevel *cvpp = cvp; 752 0 stevel return (error); 753 0 stevel } 754 0 stevel 755 0 stevel /* 756 0 stevel * Return the lowermost vnode if this is a mountpoint. 757 0 stevel */ 758 0 stevel static vnode_t * 759 0 stevel vn_under(vnode_t *vp) 760 0 stevel { 761 0 stevel vnode_t *uvp; 762 0 stevel vfs_t *vfsp; 763 0 stevel 764 0 stevel while (vp->v_flag & VROOT) { 765 0 stevel 766 0 stevel vfsp = vp->v_vfsp; 767 0 stevel vfs_rlock_wait(vfsp); 768 0 stevel if ((uvp = vfsp->vfs_vnodecovered) == NULL || 769 0 stevel (vfsp->vfs_flag & VFS_UNMOUNTED)) { 770 0 stevel vfs_unlock(vfsp); 771 0 stevel break; 772 0 stevel } 773 0 stevel VN_HOLD(uvp); 774 0 stevel vfs_unlock(vfsp); 775 0 stevel VN_RELE(vp); 776 0 stevel vp = uvp; 777 0 stevel } 778 0 stevel 779 0 stevel return (vp); 780 0 stevel } 781 0 stevel 782 0 stevel static int 783 0 stevel vnode_match(vnode_t *v1, vnode_t *v2, cred_t *cr) 784 0 stevel { 785 0 stevel vattr_t v1attr, v2attr; 786 0 stevel 787 0 stevel /* 788 0 stevel * If we have a device file, check to see if is a cloned open of the 789 0 stevel * same device. For self-cloning devices, the major numbers will match. 790 0 stevel * For devices cloned through the 'clone' driver, the minor number of 791 0 stevel * the source device will be the same as the major number of the cloned 792 0 stevel * device. 793 0 stevel */ 794 0 stevel if ((v1->v_type == VCHR || v1->v_type == VBLK) && 795 0 stevel v1->v_type == v2->v_type) { 796 0 stevel if ((spec_is_selfclone(v1) || spec_is_selfclone(v2)) && 797 0 stevel getmajor(v1->v_rdev) == getmajor(v2->v_rdev)) 798 0 stevel return (1); 799 0 stevel 800 0 stevel if (spec_is_clone(v1) && 801 0 stevel getmajor(v1->v_rdev) == getminor(v2->v_rdev)) 802 0 stevel return (1); 803 0 stevel 804 0 stevel if (spec_is_clone(v2) && 805 0 stevel getmajor(v2->v_rdev) == getminor(v1->v_rdev)) 806 0 stevel return (1); 807 0 stevel } 808 0 stevel 809 0 stevel v1attr.va_mask = v2attr.va_mask = AT_TYPE; 810 0 stevel 811 0 stevel /* 812 0 stevel * This check for symbolic links handles the pseudo-symlinks in procfs. 813 0 stevel * These particular links have v_type of VDIR, but the attributes have a 814 0 stevel * type of VLNK. We need to avoid these links because otherwise if we 815 0 stevel * are currently in '/proc/self/fd', then '/proc/self/cwd' will compare 816 0 stevel * as the same vnode. 817 0 stevel */ 818 5331 amw if (VOP_GETATTR(v1, &v1attr, 0, cr, NULL) != 0 || 819 5331 amw VOP_GETATTR(v2, &v2attr, 0, cr, NULL) != 0 || 820 0 stevel v1attr.va_type == VLNK || v2attr.va_type == VLNK) 821 0 stevel return (0); 822 0 stevel 823 0 stevel v1attr.va_mask = v2attr.va_mask = AT_TYPE | AT_FSID | AT_NODEID; 824 0 stevel 825 5331 amw if (VOP_GETATTR(v1, &v1attr, ATTR_REAL, cr, NULL) != 0 || 826 5331 amw VOP_GETATTR(v2, &v2attr, ATTR_REAL, cr, NULL) != 0) 827 0 stevel return (0); 828 0 stevel 829 0 stevel return (v1attr.va_fsid == v2attr.va_fsid && 830 0 stevel v1attr.va_nodeid == v2attr.va_nodeid); 831 0 stevel } 832 0 stevel 833 0 stevel 834 0 stevel /* 835 0 stevel * Find the entry in the directory corresponding to the target vnode. 836 0 stevel */ 837 0 stevel int 838 0 stevel dirfindvp(vnode_t *vrootp, vnode_t *dvp, vnode_t *tvp, cred_t *cr, char *dbuf, 839 0 stevel size_t dlen, dirent64_t **rdp) 840 0 stevel { 841 0 stevel size_t dbuflen; 842 0 stevel struct iovec iov; 843 0 stevel struct uio uio; 844 789 ahrens int error; 845 0 stevel int eof; 846 0 stevel vnode_t *cmpvp; 847 0 stevel struct dirent64 *dp; 848 0 stevel pathname_t pnp; 849 0 stevel 850 0 stevel ASSERT(dvp->v_type == VDIR); 851 0 stevel 852 0 stevel /* 853 0 stevel * This is necessary because of the strange semantics of VOP_LOOKUP(). 854 0 stevel */ 855 0 stevel bzero(&pnp, sizeof (pnp)); 856 0 stevel 857 0 stevel eof = 0; 858 0 stevel 859 0 stevel uio.uio_iov = &iov; 860 0 stevel uio.uio_iovcnt = 1; 861 0 stevel uio.uio_segflg = UIO_SYSSPACE; 862 0 stevel uio.uio_fmode = 0; 863 0 stevel uio.uio_extflg = UIO_COPY_CACHED; 864 0 stevel uio.uio_loffset = 0; 865 0 stevel 866 5331 amw if ((error = VOP_ACCESS(dvp, VREAD, 0, cr, NULL)) != 0) 867 789 ahrens return (error); 868 0 stevel 869 0 stevel while (!eof) { 870 0 stevel uio.uio_resid = dlen; 871 0 stevel iov.iov_base = dbuf; 872 0 stevel iov.iov_len = dlen; 873 0 stevel 874 0 stevel (void) VOP_RWLOCK(dvp, V_WRITELOCK_FALSE, NULL); 875 5331 amw error = VOP_READDIR(dvp, &uio, cr, &eof, NULL, 0); 876 0 stevel VOP_RWUNLOCK(dvp, V_WRITELOCK_FALSE, NULL); 877 0 stevel 878 0 stevel dbuflen = dlen - uio.uio_resid; 879 0 stevel 880 789 ahrens if (error || dbuflen == 0) 881 0 stevel break; 882 0 stevel 883 0 stevel dp = (dirent64_t *)dbuf; 884 0 stevel while ((intptr_t)dp < (intptr_t)dbuf + dbuflen) { 885 0 stevel /* 886 0 stevel * Ignore '.' and '..' entries 887 0 stevel */ 888 0 stevel if (strcmp(dp->d_name, ".") == 0 || 889 0 stevel strcmp(dp->d_name, "..") == 0) { 890 0 stevel dp = (dirent64_t *)((intptr_t)dp + 891 0 stevel dp->d_reclen); 892 0 stevel continue; 893 0 stevel } 894 0 stevel 895 789 ahrens error = VOP_LOOKUP(dvp, dp->d_name, &cmpvp, &pnp, 0, 896 5331 amw vrootp, cr, NULL, NULL, NULL); 897 0 stevel 898 0 stevel /* 899 0 stevel * We only want to bail out if there was an error other 900 0 stevel * than ENOENT. Otherwise, it could be that someone 901 0 stevel * just removed an entry since the readdir() call, and 902 0 stevel * the entry we want is further on in the directory. 903 0 stevel */ 904 789 ahrens if (error == 0) { 905 0 stevel if (vnode_match(tvp, cmpvp, cr)) { 906 0 stevel VN_RELE(cmpvp); 907 0 stevel *rdp = dp; 908 0 stevel return (0); 909 0 stevel } 910 0 stevel 911 0 stevel VN_RELE(cmpvp); 912 789 ahrens } else if (error != ENOENT) { 913 789 ahrens return (error); 914 0 stevel } 915 0 stevel 916 0 stevel dp = (dirent64_t *)((intptr_t)dp + dp->d_reclen); 917 0 stevel } 918 0 stevel } 919 0 stevel 920 0 stevel /* 921 0 stevel * Something strange has happened, this directory does not contain the 922 0 stevel * specified vnode. This should never happen in the normal case, since 923 789 ahrens * we ensured that dvp is the parent of vp. This is possible in some 924 789 ahrens * rare conditions (races and the special .zfs directory). 925 0 stevel */ 926 789 ahrens if (error == 0) { 927 5331 amw error = VOP_LOOKUP(dvp, ".zfs", &cmpvp, &pnp, 0, vrootp, cr, 928 5331 amw NULL, NULL, NULL); 929 789 ahrens if (error == 0) { 930 789 ahrens if (vnode_match(tvp, cmpvp, cr)) { 931 789 ahrens (void) strcpy(dp->d_name, ".zfs"); 932 789 ahrens dp->d_reclen = strlen(".zfs"); 933 789 ahrens dp->d_off = 2; 934 789 ahrens dp->d_ino = 1; 935 789 ahrens *rdp = dp; 936 789 ahrens } else { 937 789 ahrens error = ENOENT; 938 789 ahrens } 939 789 ahrens VN_RELE(cmpvp); 940 789 ahrens } 941 789 ahrens } 942 0 stevel 943 789 ahrens return (error); 944 0 stevel } 945 0 stevel 946 0 stevel /* 947 0 stevel * Given a global path (from rootdir), and a vnode that is the current root, 948 0 stevel * return the portion of the path that is beneath the current root or NULL on 949 0 stevel * failure. The path MUST be a resolved path (no '..' entries or symlinks), 950 0 stevel * otherwise this function will fail. 951 0 stevel */ 952 0 stevel static char * 953 0 stevel localpath(char *path, struct vnode *vrootp, cred_t *cr) 954 0 stevel { 955 0 stevel vnode_t *vp; 956 0 stevel vnode_t *cvp; 957 0 stevel char component[MAXNAMELEN]; 958 0 stevel char *ret = NULL; 959 0 stevel pathname_t pn; 960 0 stevel 961 0 stevel /* 962 0 stevel * We use vn_compare() instead of VN_CMP() in order to detect lofs 963 0 stevel * mounts and stacked vnodes. 964 0 stevel */ 965 0 stevel if (vn_compare(vrootp, rootdir)) 966 0 stevel return (path); 967 0 stevel 968 0 stevel if (pn_get(path, UIO_SYSSPACE, &pn) != 0) 969 0 stevel return (NULL); 970 0 stevel 971 0 stevel vp = rootdir; 972 0 stevel VN_HOLD(vp); 973 0 stevel 974 7795 Milan if (vn_ismntpt(vp) && traverse(&vp) != 0) { 975 7795 Milan VN_RELE(vp); 976 7795 Milan pn_free(&pn); 977 7795 Milan return (NULL); 978 7795 Milan } 979 7795 Milan 980 0 stevel while (pn_pathleft(&pn)) { 981 0 stevel pn_skipslash(&pn); 982 0 stevel 983 0 stevel if (pn_getcomponent(&pn, component) != 0) 984 0 stevel break; 985 0 stevel 986 5331 amw if (VOP_LOOKUP(vp, component, &cvp, &pn, 0, rootdir, cr, 987 5331 amw NULL, NULL, NULL) != 0) 988 0 stevel break; 989 0 stevel VN_RELE(vp); 990 0 stevel vp = cvp; 991 7795 Milan 992 7795 Milan if (vn_ismntpt(vp) && traverse(&vp) != 0) 993 7795 Milan break; 994 0 stevel 995 0 stevel if (vn_compare(vp, vrootp)) { 996 0 stevel ret = path + (pn.pn_path - pn.pn_buf); 997 0 stevel break; 998 0 stevel } 999 0 stevel } 1000 0 stevel 1001 0 stevel VN_RELE(vp); 1002 0 stevel pn_free(&pn); 1003 0 stevel 1004 0 stevel return (ret); 1005 0 stevel } 1006 0 stevel 1007 0 stevel /* 1008 0 stevel * Given a directory, return the full, resolved path. This looks up "..", 1009 0 stevel * searches for the given vnode in the parent, appends the component, etc. It 1010 0 stevel * is used to implement vnodetopath() and getcwd() when the cached path fails 1011 0 stevel * (or vfs_vnode_path is not set). 1012 0 stevel */ 1013 0 stevel static int 1014 10808 Milan dirtopath(vnode_t *vrootp, vnode_t *vp, char *buf, size_t buflen, int flags, 1015 10808 Milan cred_t *cr) 1016 0 stevel { 1017 0 stevel pathname_t pn, rpn, emptypn; 1018 0 stevel vnode_t *cmpvp, *pvp = NULL; 1019 0 stevel vnode_t *startvp = vp; 1020 10808 Milan int err = 0, vprivs; 1021 0 stevel size_t complen; 1022 0 stevel char *dbuf; 1023 0 stevel dirent64_t *dp; 1024 0 stevel char *bufloc; 1025 0 stevel size_t dlen = DIRENT64_RECLEN(MAXPATHLEN); 1026 0 stevel refstr_t *mntpt; 1027 0 stevel 1028 0 stevel /* Operation only allowed on directories */ 1029 0 stevel ASSERT(vp->v_type == VDIR); 1030 0 stevel 1031 0 stevel /* We must have at least enough space for "/" */ 1032 0 stevel if (buflen < 2) 1033 0 stevel return (ENAMETOOLONG); 1034 0 stevel 1035 0 stevel /* Start at end of string with terminating null */ 1036 0 stevel bufloc = &buf[buflen - 1]; 1037 0 stevel *bufloc = '\0'; 1038 0 stevel 1039 0 stevel pn_alloc(&pn); 1040 0 stevel pn_alloc(&rpn); 1041 0 stevel dbuf = kmem_alloc(dlen, KM_SLEEP); 1042 0 stevel bzero(&emptypn, sizeof (emptypn)); 1043 0 stevel 1044 0 stevel /* 1045 0 stevel * Begin with an additional reference on vp. This will be decremented 1046 0 stevel * during the loop. 1047 0 stevel */ 1048 0 stevel VN_HOLD(vp); 1049 0 stevel 1050 0 stevel for (;;) { 1051 0 stevel /* 1052 0 stevel * Return if we've reached the root. If the buffer is empty, 1053 0 stevel * return '/'. We explicitly don't use vn_compare(), since it 1054 0 stevel * compares the real vnodes. A lofs mount of '/' would produce 1055 0 stevel * incorrect results otherwise. 1056 0 stevel */ 1057 0 stevel if (VN_CMP(vrootp, vp)) { 1058 0 stevel if (*bufloc == '\0') 1059 0 stevel *--bufloc = '/'; 1060 0 stevel break; 1061 0 stevel } 1062 0 stevel 1063 0 stevel /* 1064 0 stevel * If we've reached the VFS root, something has gone wrong. We 1065 0 stevel * should have reached the root in the above check. The only 1066 0 stevel * explantation is that 'vp' is not contained withing the given 1067 0 stevel * root, in which case we return EPERM. 1068 0 stevel */ 1069 0 stevel if (VN_CMP(rootdir, vp)) { 1070 0 stevel err = EPERM; 1071 0 stevel goto out; 1072 0 stevel } 1073 0 stevel 1074 0 stevel /* 1075 0 stevel * Shortcut: see if this vnode is a mountpoint. If so, 1076 0 stevel * grab the path information from the vfs_t. 1077 0 stevel */ 1078 0 stevel if (vp->v_flag & VROOT) { 1079 0 stevel 1080 0 stevel mntpt = vfs_getmntpoint(vp->v_vfsp); 1081 0 stevel if ((err = pn_set(&pn, (char *)refstr_value(mntpt))) 1082 0 stevel == 0) { 1083 0 stevel refstr_rele(mntpt); 1084 0 stevel rpn.pn_path = rpn.pn_buf; 1085 0 stevel 1086 0 stevel /* 1087 8741 Milan * Ensure the mountpoint still exists. 1088 0 stevel */ 1089 0 stevel VN_HOLD(vrootp); 1090 0 stevel if (vrootp != rootdir) 1091 0 stevel VN_HOLD(vrootp); 1092 10808 Milan if (lookuppnvp(&pn, &rpn, flags, NULL, 1093 0 stevel &cmpvp, vrootp, vrootp, cr) == 0) { 1094 0 stevel 1095 0 stevel if (VN_CMP(vp, cmpvp)) { 1096 0 stevel VN_RELE(cmpvp); 1097 0 stevel 1098 0 stevel complen = strlen(rpn.pn_path); 1099 0 stevel bufloc -= complen; 1100 0 stevel if (bufloc < buf) { 1101 0 stevel err = ERANGE; 1102 0 stevel goto out; 1103 0 stevel } 1104 0 stevel bcopy(rpn.pn_path, bufloc, 1105 0 stevel complen); 1106 0 stevel break; 1107 0 stevel } else { 1108 0 stevel VN_RELE(cmpvp); 1109 0 stevel } 1110 0 stevel } 1111 0 stevel } else { 1112 0 stevel refstr_rele(mntpt); 1113 0 stevel } 1114 8741 Milan } 1115 8741 Milan 1116 8741 Milan /* 1117 8741 Milan * Shortcut: see if this vnode has correct v_path. If so, 1118 8741 Milan * we have the work done. 1119 8741 Milan */ 1120 8741 Milan mutex_enter(&vp->v_lock); 1121 8741 Milan if (vp->v_path != NULL) { 1122 8741 Milan 1123 8741 Milan if ((err = pn_set(&pn, vp->v_path)) == 0) { 1124 8741 Milan mutex_exit(&vp->v_lock); 1125 8741 Milan rpn.pn_path = rpn.pn_buf; 1126 8741 Milan 1127 8741 Milan /* 1128 8741 Milan * Ensure the v_path pointing to correct vnode 1129 8741 Milan */ 1130 8741 Milan VN_HOLD(vrootp); 1131 8741 Milan if (vrootp != rootdir) 1132 8741 Milan VN_HOLD(vrootp); 1133 10808 Milan if (lookuppnvp(&pn, &rpn, flags, NULL, 1134 8741 Milan &cmpvp, vrootp, vrootp, cr) == 0) { 1135 8741 Milan 1136 8741 Milan if (VN_CMP(vp, cmpvp)) { 1137 8741 Milan VN_RELE(cmpvp); 1138 8741 Milan 1139 8741 Milan complen = strlen(rpn.pn_path); 1140 8741 Milan bufloc -= complen; 1141 8741 Milan if (bufloc < buf) { 1142 8741 Milan err = ERANGE; 1143 8741 Milan goto out; 1144 8741 Milan } 1145 8741 Milan bcopy(rpn.pn_path, bufloc, 1146 8741 Milan complen); 1147 8741 Milan break; 1148 8741 Milan } else { 1149 8741 Milan VN_RELE(cmpvp); 1150 8741 Milan } 1151 8741 Milan } 1152 8741 Milan } else { 1153 8741 Milan mutex_exit(&vp->v_lock); 1154 8741 Milan } 1155 8741 Milan } else { 1156 8741 Milan mutex_exit(&vp->v_lock); 1157 0 stevel } 1158 0 stevel 1159 0 stevel /* 1160 0 stevel * Shortcuts failed, search for this vnode in its parent. If 1161 0 stevel * this is a mountpoint, then get the vnode underneath. 1162 0 stevel */ 1163 0 stevel if (vp->v_flag & VROOT) 1164 0 stevel vp = vn_under(vp); 1165 5331 amw if ((err = VOP_LOOKUP(vp, "..", &pvp, &emptypn, 0, vrootp, cr, 1166 5331 amw NULL, NULL, NULL)) != 0) 1167 0 stevel goto out; 1168 0 stevel 1169 0 stevel /* 1170 0 stevel * With extended attributes, it's possible for a directory to 1171 0 stevel * have a parent that is a regular file. Check for that here. 1172 0 stevel */ 1173 0 stevel if (pvp->v_type != VDIR) { 1174 0 stevel err = ENOTDIR; 1175 0 stevel goto out; 1176 0 stevel } 1177 0 stevel 1178 0 stevel /* 1179 0 stevel * If this is true, something strange has happened. This is 1180 0 stevel * only true if we are the root of a filesystem, which should 1181 0 stevel * have been caught by the check above. 1182 0 stevel */ 1183 0 stevel if (VN_CMP(pvp, vp)) { 1184 0 stevel err = ENOENT; 1185 10808 Milan goto out; 1186 10808 Milan } 1187 10808 Milan 1188 10808 Milan /* 1189 10808 Milan * Check if we have read and search privilege so, that 1190 10808 Milan * we can lookup the path in the directory 1191 10808 Milan */ 1192 10808 Milan vprivs = (flags & LOOKUP_CHECKREAD) ? VREAD | VEXEC : VEXEC; 1193 10808 Milan if ((err = VOP_ACCESS(pvp, vprivs, 0, cr, NULL)) != 0) { 1194 0 stevel goto out; 1195 0 stevel } 1196 0 stevel 1197 0 stevel /* 1198 8741 Milan * Try to obtain the path component from dnlc cache 1199 8741 Milan * before searching through the directory. 1200 8741 Milan */ 1201 8741 Milan if ((cmpvp = dnlc_reverse_lookup(vp, dbuf, dlen)) != NULL) { 1202 8741 Milan /* 1203 8741 Milan * If we got parent vnode as a result, 1204 8741 Milan * then the answered path is correct. 1205 8741 Milan */ 1206 8741 Milan if (VN_CMP(cmpvp, pvp)) { 1207 8741 Milan VN_RELE(cmpvp); 1208 8741 Milan complen = strlen(dbuf); 1209 8741 Milan bufloc -= complen; 1210 8741 Milan if (bufloc <= buf) { 1211 8741 Milan err = ENAMETOOLONG; 1212 8741 Milan goto out; 1213 8741 Milan } 1214 8741 Milan bcopy(dbuf, bufloc, complen); 1215 8741 Milan 1216 8741 Milan /* Prepend a slash to the current path */ 1217 8741 Milan *--bufloc = '/'; 1218 8741 Milan 1219 8741 Milan /* And continue with the next component */ 1220 8741 Milan VN_RELE(vp); 1221 8741 Milan vp = pvp; 1222 8741 Milan pvp = NULL; 1223 8741 Milan continue; 1224 8741 Milan } else { 1225 8741 Milan VN_RELE(cmpvp); 1226 8741 Milan } 1227 8741 Milan } 1228 8741 Milan 1229 8741 Milan /* 1230 0 stevel * Search the parent directory for the entry corresponding to 1231 0 stevel * this vnode. 1232 0 stevel */ 1233 0 stevel if ((err = dirfindvp(vrootp, pvp, vp, cr, dbuf, dlen, &dp)) 1234 0 stevel != 0) 1235 0 stevel goto out; 1236 0 stevel complen = strlen(dp->d_name); 1237 0 stevel bufloc -= complen; 1238 0 stevel if (bufloc <= buf) { 1239 0 stevel err = ENAMETOOLONG; 1240 0 stevel goto out; 1241 0 stevel } 1242 0 stevel bcopy(dp->d_name, bufloc, complen); 1243 0 stevel 1244 0 stevel /* Prepend a slash to the current path. */ 1245 0 stevel *--bufloc = '/'; 1246 0 stevel 1247 0 stevel /* And continue with the next component */ 1248 0 stevel VN_RELE(vp); 1249 0 stevel vp = pvp; 1250 0 stevel pvp = NULL; 1251 0 stevel } 1252 0 stevel 1253 0 stevel /* 1254 0 stevel * Place the path at the beginning of the buffer. 1255 0 stevel */ 1256 0 stevel if (bufloc != buf) 1257 0 stevel ovbcopy(bufloc, buf, buflen - (bufloc - buf)); 1258 0 stevel 1259 8741 Milan /* 1260 8741 Milan * We got here because of invalid v_path in startvp. 1261 8741 Milan * Now, we have all info to fix it. 1262 8741 Milan * Path must not include leading slash to let vn_renamepath 1263 8741 Milan * pre-attach chroot'd root directory path. Also, trailing '\0' 1264 8741 Milan * is not counted to length. 1265 8741 Milan */ 1266 8741 Milan vn_renamepath(vrootp, startvp, &buf[1], buflen - (bufloc - buf) - 2); 1267 8741 Milan 1268 0 stevel out: 1269 0 stevel /* 1270 0 stevel * If the error was ESTALE and the current directory to look in 1271 0 stevel * was the root for this lookup, the root for a mounted file 1272 0 stevel * system, or the starting directory for lookups, then 1273 0 stevel * return ENOENT instead of ESTALE. In this case, no recovery 1274 0 stevel * is possible by the higher level. If ESTALE was returned for 1275 0 stevel * some intermediate directory along the path, then recovery 1276 0 stevel * is potentially possible and retrying from the higher level 1277 0 stevel * will either correct the situation by purging stale cache 1278 0 stevel * entries or eventually get back to the point where no recovery 1279 0 stevel * is possible. 1280 0 stevel */ 1281 0 stevel if (err == ESTALE && 1282 0 stevel (VN_CMP(vp, vrootp) || (vp->v_flag & VROOT) || vp == startvp)) 1283 0 stevel err = ENOENT; 1284 0 stevel 1285 0 stevel kmem_free(dbuf, dlen); 1286 0 stevel VN_RELE(vp); 1287 0 stevel if (pvp) 1288 0 stevel VN_RELE(pvp); 1289 0 stevel pn_free(&pn); 1290 0 stevel pn_free(&rpn); 1291 0 stevel 1292 0 stevel return (err); 1293 0 stevel } 1294 0 stevel 1295 0 stevel /* 1296 8741 Milan * The additional flag, LOOKUP_CHECKREAD, is used to enforce artificial 1297 0 stevel * constraints in order to be standards compliant. For example, if we have 1298 0 stevel * the cached path of '/foo/bar', and '/foo' has permissions 100 (execute 1299 0 stevel * only), then we can legitimately look up the path to the current working 1300 0 stevel * directory without needing read permission. Existing standards tests, 1301 0 stevel * however, assume that we are determining the path by repeatedly looking up 1302 0 stevel * "..". We need to keep this behavior in order to maintain backwards 1303 0 stevel * compatibility. 1304 0 stevel */ 1305 0 stevel static int 1306 0 stevel vnodetopath_common(vnode_t *vrootp, vnode_t *vp, char *buf, size_t buflen, 1307 0 stevel cred_t *cr, int flags) 1308 0 stevel { 1309 0 stevel pathname_t pn, rpn; 1310 0 stevel int ret, len; 1311 0 stevel vnode_t *compvp, *pvp, *realvp; 1312 0 stevel proc_t *p = curproc; 1313 0 stevel char path[MAXNAMELEN]; 1314 0 stevel int doclose = 0; 1315 0 stevel 1316 0 stevel /* 1317 0 stevel * If vrootp is NULL, get the root for curproc. Callers with any other 1318 0 stevel * requirements should pass in a different vrootp. 1319 0 stevel */ 1320 0 stevel if (vrootp == NULL) { 1321 0 stevel mutex_enter(&p->p_lock); 1322 0 stevel if ((vrootp = PTOU(p)->u_rdir) == NULL) 1323 0 stevel vrootp = rootdir; 1324 0 stevel VN_HOLD(vrootp); 1325 0 stevel mutex_exit(&p->p_lock); 1326 0 stevel } else { 1327 0 stevel VN_HOLD(vrootp); 1328 0 stevel } 1329 0 stevel 1330 0 stevel /* 1331 0 stevel * This is to get around an annoying artifact of the /proc filesystem, 1332 0 stevel * which is the behavior of {cwd/root}. Trying to resolve this path 1333 0 stevel * will result in /proc/pid/cwd instead of whatever the real working 1334 0 stevel * directory is. We can't rely on VOP_REALVP(), since that will break 1335 0 stevel * lofs. The only difference between procfs and lofs is that opening 1336 0 stevel * the file will return the underling vnode in the case of procfs. 1337 0 stevel */ 1338 5331 amw if (vp->v_type == VDIR && VOP_REALVP(vp, &realvp, NULL) == 0 && 1339 0 stevel realvp != vp) { 1340 0 stevel VN_HOLD(vp); 1341 5331 amw if (VOP_OPEN(&vp, FREAD, cr, NULL) == 0) 1342 0 stevel doclose = 1; 1343 0 stevel else 1344 0 stevel VN_RELE(vp); 1345 0 stevel } 1346 0 stevel 1347 0 stevel pn_alloc(&pn); 1348 0 stevel 1349 0 stevel /* 1350 0 stevel * Check to see if we have a cached path in the vnode. 1351 0 stevel */ 1352 0 stevel mutex_enter(&vp->v_lock); 1353 254 eschrock if (vp->v_path != NULL) { 1354 254 eschrock (void) pn_set(&pn, vp->v_path); 1355 0 stevel mutex_exit(&vp->v_lock); 1356 0 stevel 1357 0 stevel pn_alloc(&rpn); 1358 0 stevel 1359 0 stevel /* We should only cache absolute paths */ 1360 0 stevel ASSERT(pn.pn_buf[0] == '/'); 1361 0 stevel 1362 0 stevel /* 1363 0 stevel * If we are in a zone or a chroot environment, then we have to 1364 0 stevel * take additional steps, since the path to the root might not 1365 0 stevel * be readable with the current credentials, even though the 1366 0 stevel * process can legitmately access the file. In this case, we 1367 0 stevel * do the following: 1368 0 stevel * 1369 0 stevel * lookuppnvp() with all privileges to get the resolved path. 1370 0 stevel * call localpath() to get the local portion of the path, and 1371 0 stevel * continue as normal. 1372 0 stevel * 1373 0 stevel * If the the conversion to a local path fails, then we continue 1374 0 stevel * as normal. This is a heuristic to make process object file 1375 0 stevel * paths available from within a zone. Because lofs doesn't 1376 0 stevel * support page operations, the vnode stored in the seg_t is 1377 0 stevel * actually the underlying real vnode, not the lofs node itself. 1378 0 stevel * Most of the time, the lofs path is the same as the underlying 1379 0 stevel * vnode (for example, /usr/lib/libc.so.1). 1380 0 stevel */ 1381 0 stevel if (vrootp != rootdir) { 1382 0 stevel char *local = NULL; 1383 0 stevel VN_HOLD(rootdir); 1384 0 stevel if (lookuppnvp(&pn, &rpn, FOLLOW, 1385 0 stevel NULL, &compvp, rootdir, rootdir, kcred) == 0) { 1386 0 stevel local = localpath(rpn.pn_path, vrootp, 1387 0 stevel kcred); 1388 0 stevel VN_RELE(compvp); 1389 0 stevel } 1390 0 stevel 1391 0 stevel /* 1392 8741 Milan * The original pn was changed through lookuppnvp(). 1393 8741 Milan * Set it to local for next validation attempt. 1394 0 stevel */ 1395 0 stevel if (local) { 1396 0 stevel (void) pn_set(&pn, local); 1397 0 stevel } else { 1398 8741 Milan goto notcached; 1399 0 stevel } 1400 0 stevel } 1401 0 stevel 1402 0 stevel /* 1403 0 stevel * We should have a local path at this point, so start the 1404 0 stevel * search from the root of the current process. 1405 0 stevel */ 1406 0 stevel VN_HOLD(vrootp); 1407 0 stevel if (vrootp != rootdir) 1408 0 stevel VN_HOLD(vrootp); 1409 0 stevel ret = lookuppnvp(&pn, &rpn, FOLLOW | flags, NULL, 1410 0 stevel &compvp, vrootp, vrootp, cr); 1411 0 stevel if (ret == 0) { 1412 0 stevel /* 1413 0 stevel * Check to see if the returned vnode is the same as 1414 0 stevel * the one we expect. If not, give up. 1415 0 stevel */ 1416 0 stevel if (!vn_compare(vp, compvp) && 1417 0 stevel !vnode_match(vp, compvp, cr)) { 1418 0 stevel VN_RELE(compvp); 1419 0 stevel goto notcached; 1420 0 stevel } 1421 0 stevel 1422 0 stevel VN_RELE(compvp); 1423 0 stevel 1424 0 stevel /* 1425 0 stevel * Return the result. 1426 0 stevel */ 1427 0 stevel if (buflen <= rpn.pn_pathlen) 1428 0 stevel goto notcached; 1429 0 stevel 1430 0 stevel bcopy(rpn.pn_path, buf, rpn.pn_pathlen + 1); 1431 0 stevel pn_free(&pn); 1432 0 stevel pn_free(&rpn); 1433 0 stevel VN_RELE(vrootp); 1434 0 stevel if (doclose) { 1435 5331 amw (void) VOP_CLOSE(vp, FREAD, 1, 0, cr, NULL); 1436 0 stevel VN_RELE(vp); 1437 0 stevel } 1438 0 stevel return (0); 1439 0 stevel } 1440 0 stevel 1441 0 stevel notcached: 1442 0 stevel pn_free(&rpn); 1443 0 stevel } else { 1444 0 stevel mutex_exit(&vp->v_lock); 1445 0 stevel } 1446 0 stevel 1447 0 stevel pn_free(&pn); 1448 0 stevel 1449 0 stevel if (vp->v_type != VDIR) { 1450 0 stevel /* 1451 0 stevel * If we don't have a directory, try to find it in the dnlc via 1452 0 stevel * reverse lookup. Once this is found, we can use the regular 1453 0 stevel * directory search to find the full path. 1454 0 stevel */ 1455 0 stevel if ((pvp = dnlc_reverse_lookup(vp, path, MAXNAMELEN)) != NULL) { 1456 10808 Milan /* 1457 10808 Milan * Check if we have read privilege so, that 1458 10808 Milan * we can lookup the path in the directory 1459 10808 Milan */ 1460 10808 Milan ret = 0; 1461 10808 Milan if ((flags & LOOKUP_CHECKREAD)) { 1462 10808 Milan ret = VOP_ACCESS(pvp, VREAD, 0, cr, NULL); 1463 10808 Milan } 1464 10808 Milan if (ret == 0) { 1465 10808 Milan ret = dirtopath(vrootp, pvp, buf, buflen, 1466 10808 Milan flags, cr); 1467 10808 Milan } 1468 0 stevel if (ret == 0) { 1469 0 stevel len = strlen(buf); 1470 0 stevel if (len + strlen(path) + 1 >= buflen) { 1471 0 stevel ret = ENAMETOOLONG; 1472 0 stevel } else { 1473 0 stevel if (buf[len - 1] != '/') 1474 0 stevel buf[len++] = '/'; 1475 0 stevel bcopy(path, buf + len, 1476 0 stevel strlen(path) + 1); 1477 0 stevel } 1478 0 stevel } 1479 0 stevel 1480 0 stevel VN_RELE(pvp); 1481 0 stevel } else 1482 0 stevel ret = ENOENT; 1483 0 stevel } else 1484 10808 Milan ret = dirtopath(vrootp, vp, buf, buflen, flags, cr); 1485 0 stevel 1486 0 stevel VN_RELE(vrootp); 1487 0 stevel if (doclose) { 1488 5331 amw (void) VOP_CLOSE(vp, FREAD, 1, 0, cr, NULL); 1489 0 stevel VN_RELE(vp); 1490 0 stevel } 1491 0 stevel 1492 0 stevel return (ret); 1493 0 stevel } 1494 0 stevel 1495 0 stevel int 1496 0 stevel vnodetopath(vnode_t *vrootp, vnode_t *vp, char *buf, size_t buflen, cred_t *cr) 1497 0 stevel { 1498 0 stevel return (vnodetopath_common(vrootp, vp, buf, buflen, cr, 0)); 1499 0 stevel } 1500 0 stevel 1501 0 stevel int 1502 0 stevel dogetcwd(char *buf, size_t buflen) 1503 0 stevel { 1504 0 stevel int ret; 1505 0 stevel vnode_t *vp; 1506 0 stevel vnode_t *compvp; 1507 0 stevel refstr_t *cwd, *oldcwd; 1508 0 stevel const char *value; 1509 0 stevel pathname_t rpnp, pnp; 1510 0 stevel proc_t *p = curproc; 1511 0 stevel 1512 0 stevel /* 1513 0 stevel * Check to see if there is a cached version of the cwd. If so, lookup 1514 0 stevel * the cached value and make sure it is the same vnode. 1515 0 stevel */ 1516 0 stevel mutex_enter(&p->p_lock); 1517 0 stevel if ((cwd = PTOU(p)->u_cwd) != NULL) 1518 0 stevel refstr_hold(cwd); 1519 0 stevel vp = PTOU(p)->u_cdir; 1520 0 stevel VN_HOLD(vp); 1521 0 stevel mutex_exit(&p->p_lock); 1522 0 stevel 1523 0 stevel /* 1524 0 stevel * Make sure we have permission to access the current directory. 1525 0 stevel */ 1526 5331 amw if ((ret = VOP_ACCESS(vp, VEXEC, 0, CRED(), NULL)) != 0) { 1527 0 stevel if (cwd != NULL) 1528 0 stevel refstr_rele(cwd); 1529 0 stevel VN_RELE(vp); 1530 0 stevel return (ret); 1531 0 stevel } 1532 0 stevel 1533 0 stevel if (cwd) { 1534 0 stevel value = refstr_value(cwd); 1535 0 stevel if ((ret = pn_get((char *)value, UIO_SYSSPACE, &pnp)) != 0) { 1536 0 stevel refstr_rele(cwd); 1537 0 stevel VN_RELE(vp); 1538 0 stevel return (ret); 1539 0 stevel } 1540 0 stevel 1541 0 stevel pn_alloc(&rpnp); 1542 0 stevel 1543 0 stevel if (lookuppn(&pnp, &rpnp, NO_FOLLOW, NULL, &compvp) == 0) { 1544 0 stevel 1545 0 stevel if (VN_CMP(vp, compvp) && 1546 0 stevel strcmp(value, rpnp.pn_path) == 0) { 1547 0 stevel VN_RELE(compvp); 1548 0 stevel VN_RELE(vp); 1549 0 stevel pn_free(&pnp); 1550 0 stevel pn_free(&rpnp); 1551 0 stevel if (strlen(value) + 1 > buflen) { 1552 0 stevel refstr_rele(cwd); 1553 0 stevel return (ENAMETOOLONG); 1554 0 stevel } 1555 0 stevel bcopy(value, buf, strlen(value) + 1); 1556 0 stevel refstr_rele(cwd); 1557 0 stevel return (0); 1558 0 stevel } 1559 0 stevel 1560 0 stevel VN_RELE(compvp); 1561 0 stevel } 1562 0 stevel 1563 0 stevel pn_free(&rpnp); 1564 0 stevel pn_free(&pnp); 1565 0 stevel 1566 0 stevel refstr_rele(cwd); 1567 0 stevel } 1568 0 stevel 1569 0 stevel ret = vnodetopath_common(NULL, vp, buf, buflen, CRED(), 1570 0 stevel LOOKUP_CHECKREAD); 1571 0 stevel 1572 0 stevel VN_RELE(vp); 1573 0 stevel 1574 0 stevel /* 1575 0 stevel * Store the new cwd and replace the existing cached copy. 1576 0 stevel */ 1577 0 stevel if (ret == 0) 1578 0 stevel cwd = refstr_alloc(buf); 1579 0 stevel else 1580 0 stevel cwd = NULL; 1581 0 stevel 1582 0 stevel mutex_enter(&p->p_lock); 1583 0 stevel oldcwd = PTOU(p)->u_cwd; 1584 0 stevel PTOU(p)->u_cwd = cwd; 1585 0 stevel mutex_exit(&p->p_lock); 1586 0 stevel 1587 0 stevel if (oldcwd) 1588 0 stevel refstr_rele(oldcwd); 1589 0 stevel 1590 0 stevel return (ret); 1591 0 stevel } 1592
Indexes created Sat Nov 28 01:19:25 UTC 2009
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