17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 52e538c1cSvv * Common Development and Distribution License (the "License"). 62e538c1cSvv * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 217c478bd9Sstevel@tonic-gate /* 222f5706a1SWilliam.Johnston * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved. 237c478bd9Sstevel@tonic-gate */ 247c478bd9Sstevel@tonic-gate 257c478bd9Sstevel@tonic-gate /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 267c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 277c478bd9Sstevel@tonic-gate 287c478bd9Sstevel@tonic-gate /* 297c478bd9Sstevel@tonic-gate * University Copyright- Copyright (c) 1982, 1986, 1988 307c478bd9Sstevel@tonic-gate * The Regents of the University of California 317c478bd9Sstevel@tonic-gate * All Rights Reserved 327c478bd9Sstevel@tonic-gate * 337c478bd9Sstevel@tonic-gate * University Acknowledgment- Portions of this document are derived from 347c478bd9Sstevel@tonic-gate * software developed by the University of California, Berkeley, and its 357c478bd9Sstevel@tonic-gate * contributors. 367c478bd9Sstevel@tonic-gate */ 377c478bd9Sstevel@tonic-gate 387c478bd9Sstevel@tonic-gate #include <sys/types.h> 397c478bd9Sstevel@tonic-gate #include <sys/param.h> 407c478bd9Sstevel@tonic-gate #include <sys/systm.h> 417c478bd9Sstevel@tonic-gate #include <sys/cpuvar.h> 427c478bd9Sstevel@tonic-gate #include <sys/errno.h> 437c478bd9Sstevel@tonic-gate #include <sys/cred.h> 447c478bd9Sstevel@tonic-gate #include <sys/user.h> 457c478bd9Sstevel@tonic-gate #include <sys/uio.h> 467c478bd9Sstevel@tonic-gate #include <sys/vfs.h> 477c478bd9Sstevel@tonic-gate #include <sys/vnode.h> 487c478bd9Sstevel@tonic-gate #include <sys/pathname.h> 497c478bd9Sstevel@tonic-gate #include <sys/proc.h> 507c478bd9Sstevel@tonic-gate #include <sys/vtrace.h> 517c478bd9Sstevel@tonic-gate #include <sys/sysmacros.h> 527c478bd9Sstevel@tonic-gate #include <sys/debug.h> 537c478bd9Sstevel@tonic-gate #include <sys/dirent.h> 547c478bd9Sstevel@tonic-gate #include <c2/audit.h> 557c478bd9Sstevel@tonic-gate #include <sys/zone.h> 567c478bd9Sstevel@tonic-gate #include <sys/dnlc.h> 577c478bd9Sstevel@tonic-gate #include <sys/fs/snode.h> 587c478bd9Sstevel@tonic-gate 597c478bd9Sstevel@tonic-gate /* Controls whether paths are stored with vnodes. */ 607c478bd9Sstevel@tonic-gate int vfs_vnode_path = 1; 617c478bd9Sstevel@tonic-gate 627c478bd9Sstevel@tonic-gate int 637c478bd9Sstevel@tonic-gate lookupname( 647c478bd9Sstevel@tonic-gate char *fnamep, 657c478bd9Sstevel@tonic-gate enum uio_seg seg, 667c478bd9Sstevel@tonic-gate enum symfollow followlink, 677c478bd9Sstevel@tonic-gate vnode_t **dirvpp, 687c478bd9Sstevel@tonic-gate vnode_t **compvpp) 697c478bd9Sstevel@tonic-gate { 707a142be9SCasper H.S. Dik return (lookupnameatcred(fnamep, seg, followlink, dirvpp, compvpp, NULL, 717a142be9SCasper H.S. Dik CRED())); 727c478bd9Sstevel@tonic-gate } 737c478bd9Sstevel@tonic-gate 747c478bd9Sstevel@tonic-gate /* 757c478bd9Sstevel@tonic-gate * Lookup the user file name, 767c478bd9Sstevel@tonic-gate * Handle allocation and freeing of pathname buffer, return error. 777c478bd9Sstevel@tonic-gate */ 787c478bd9Sstevel@tonic-gate int 797a142be9SCasper H.S. Dik lookupnameatcred( 807c478bd9Sstevel@tonic-gate char *fnamep, /* user pathname */ 817c478bd9Sstevel@tonic-gate enum uio_seg seg, /* addr space that name is in */ 827c478bd9Sstevel@tonic-gate enum symfollow followlink, /* follow sym links */ 837c478bd9Sstevel@tonic-gate vnode_t **dirvpp, /* ret for ptr to parent dir vnode */ 847c478bd9Sstevel@tonic-gate vnode_t **compvpp, /* ret for ptr to component vnode */ 857a142be9SCasper H.S. Dik vnode_t *startvp, /* start path search from vp */ 867a142be9SCasper H.S. Dik cred_t *cr) /* credential */ 877c478bd9Sstevel@tonic-gate { 887c478bd9Sstevel@tonic-gate char namebuf[TYPICALMAXPATHLEN]; 897c478bd9Sstevel@tonic-gate struct pathname lookpn; 907c478bd9Sstevel@tonic-gate int error; 917c478bd9Sstevel@tonic-gate 927c478bd9Sstevel@tonic-gate error = pn_get_buf(fnamep, seg, &lookpn, namebuf, sizeof (namebuf)); 937c478bd9Sstevel@tonic-gate if (error == 0) { 947a142be9SCasper H.S. Dik error = lookuppnatcred(&lookpn, NULL, followlink, 957a142be9SCasper H.S. Dik dirvpp, compvpp, startvp, cr); 967c478bd9Sstevel@tonic-gate } 977c478bd9Sstevel@tonic-gate if (error == ENAMETOOLONG) { 987c478bd9Sstevel@tonic-gate /* 997c478bd9Sstevel@tonic-gate * This thread used a pathname > TYPICALMAXPATHLEN bytes long. 1007c478bd9Sstevel@tonic-gate */ 1017c478bd9Sstevel@tonic-gate if (error = pn_get(fnamep, seg, &lookpn)) 1027c478bd9Sstevel@tonic-gate return (error); 1037a142be9SCasper H.S. Dik error = lookuppnatcred(&lookpn, NULL, followlink, 1047a142be9SCasper H.S. Dik dirvpp, compvpp, startvp, cr); 1057c478bd9Sstevel@tonic-gate pn_free(&lookpn); 1067c478bd9Sstevel@tonic-gate } 1077c478bd9Sstevel@tonic-gate 1087c478bd9Sstevel@tonic-gate return (error); 1097c478bd9Sstevel@tonic-gate } 1107c478bd9Sstevel@tonic-gate 1117a142be9SCasper H.S. Dik int 1127a142be9SCasper H.S. Dik lookupnameat(char *fnamep, enum uio_seg seg, enum symfollow followlink, 1137a142be9SCasper H.S. Dik vnode_t **dirvpp, vnode_t **compvpp, vnode_t *startvp) 1147a142be9SCasper H.S. Dik { 1157a142be9SCasper H.S. Dik return (lookupnameatcred(fnamep, seg, followlink, dirvpp, compvpp, 1167a142be9SCasper H.S. Dik startvp, CRED())); 1177a142be9SCasper H.S. Dik } 1187a142be9SCasper H.S. Dik 1197c478bd9Sstevel@tonic-gate int 1207c478bd9Sstevel@tonic-gate lookuppn( 1217c478bd9Sstevel@tonic-gate struct pathname *pnp, 1227c478bd9Sstevel@tonic-gate struct pathname *rpnp, 1237c478bd9Sstevel@tonic-gate enum symfollow followlink, 1247c478bd9Sstevel@tonic-gate vnode_t **dirvpp, 1257c478bd9Sstevel@tonic-gate vnode_t **compvpp) 1267c478bd9Sstevel@tonic-gate { 1277a142be9SCasper H.S. Dik return (lookuppnatcred(pnp, rpnp, followlink, dirvpp, compvpp, NULL, 1287a142be9SCasper H.S. Dik CRED())); 1297c478bd9Sstevel@tonic-gate } 1307c478bd9Sstevel@tonic-gate 1317a142be9SCasper H.S. Dik /* 1327a142be9SCasper H.S. Dik * Lookup the user file name from a given vp, using a specific credential. 1337a142be9SCasper H.S. Dik */ 1347c478bd9Sstevel@tonic-gate int 1357a142be9SCasper H.S. Dik lookuppnatcred( 1367c478bd9Sstevel@tonic-gate struct pathname *pnp, /* pathname to lookup */ 1377c478bd9Sstevel@tonic-gate struct pathname *rpnp, /* if non-NULL, return resolved path */ 1387c478bd9Sstevel@tonic-gate enum symfollow followlink, /* (don't) follow sym links */ 1397c478bd9Sstevel@tonic-gate vnode_t **dirvpp, /* ptr for parent vnode */ 1407c478bd9Sstevel@tonic-gate vnode_t **compvpp, /* ptr for entry vnode */ 1417a142be9SCasper H.S. Dik vnode_t *startvp, /* start search from this vp */ 1427a142be9SCasper H.S. Dik cred_t *cr) /* user credential */ 1437c478bd9Sstevel@tonic-gate { 1447c478bd9Sstevel@tonic-gate vnode_t *vp; /* current directory vp */ 1457c478bd9Sstevel@tonic-gate vnode_t *rootvp; 1467c478bd9Sstevel@tonic-gate proc_t *p = curproc; 1477c478bd9Sstevel@tonic-gate 1487c478bd9Sstevel@tonic-gate if (pnp->pn_pathlen == 0) 1497c478bd9Sstevel@tonic-gate return (ENOENT); 1507c478bd9Sstevel@tonic-gate 1517c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); /* for u_rdir and u_cdir */ 1527c478bd9Sstevel@tonic-gate if ((rootvp = PTOU(p)->u_rdir) == NULL) 1537c478bd9Sstevel@tonic-gate rootvp = rootdir; 1547c478bd9Sstevel@tonic-gate else if (rootvp != rootdir) /* no need to VN_HOLD rootdir */ 1557c478bd9Sstevel@tonic-gate VN_HOLD(rootvp); 1567c478bd9Sstevel@tonic-gate 1577c478bd9Sstevel@tonic-gate if (pnp->pn_path[0] == '/') { 1587c478bd9Sstevel@tonic-gate vp = rootvp; 1597c478bd9Sstevel@tonic-gate } else { 1607c478bd9Sstevel@tonic-gate vp = (startvp == NULL) ? PTOU(p)->u_cdir : startvp; 1617c478bd9Sstevel@tonic-gate } 1627c478bd9Sstevel@tonic-gate VN_HOLD(vp); 1637c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 1647c478bd9Sstevel@tonic-gate 1657c478bd9Sstevel@tonic-gate /* 1667c478bd9Sstevel@tonic-gate * Skip over leading slashes 1677c478bd9Sstevel@tonic-gate */ 1687c478bd9Sstevel@tonic-gate if (pnp->pn_path[0] == '/') { 1697c478bd9Sstevel@tonic-gate do { 1707c478bd9Sstevel@tonic-gate pnp->pn_path++; 1717c478bd9Sstevel@tonic-gate pnp->pn_pathlen--; 1727c478bd9Sstevel@tonic-gate } while (pnp->pn_path[0] == '/'); 1737c478bd9Sstevel@tonic-gate } 1747c478bd9Sstevel@tonic-gate 1757c478bd9Sstevel@tonic-gate return (lookuppnvp(pnp, rpnp, followlink, dirvpp, 1767a142be9SCasper H.S. Dik compvpp, rootvp, vp, cr)); 1777a142be9SCasper H.S. Dik } 1787a142be9SCasper H.S. Dik 1797a142be9SCasper H.S. Dik int 1807a142be9SCasper H.S. Dik lookuppnat(struct pathname *pnp, struct pathname *rpnp, 1817a142be9SCasper H.S. Dik enum symfollow followlink, vnode_t **dirvpp, vnode_t **compvpp, 1827a142be9SCasper H.S. Dik vnode_t *startvp) 1837a142be9SCasper H.S. Dik { 1847a142be9SCasper H.S. Dik return (lookuppnatcred(pnp, rpnp, followlink, dirvpp, compvpp, startvp, 1857a142be9SCasper H.S. Dik CRED())); 1867c478bd9Sstevel@tonic-gate } 1877c478bd9Sstevel@tonic-gate 1887c478bd9Sstevel@tonic-gate /* Private flag to do our getcwd() dirty work */ 1897c478bd9Sstevel@tonic-gate #define LOOKUP_CHECKREAD 0x10 1907c478bd9Sstevel@tonic-gate #define LOOKUP_MASK (~LOOKUP_CHECKREAD) 1917c478bd9Sstevel@tonic-gate 1927c478bd9Sstevel@tonic-gate /* 1937c478bd9Sstevel@tonic-gate * Starting at current directory, translate pathname pnp to end. 1947c478bd9Sstevel@tonic-gate * Leave pathname of final component in pnp, return the vnode 1957c478bd9Sstevel@tonic-gate * for the final component in *compvpp, and return the vnode 1967c478bd9Sstevel@tonic-gate * for the parent of the final component in dirvpp. 1977c478bd9Sstevel@tonic-gate * 1987c478bd9Sstevel@tonic-gate * This is the central routine in pathname translation and handles 1997c478bd9Sstevel@tonic-gate * multiple components in pathnames, separating them at /'s. It also 2007c478bd9Sstevel@tonic-gate * implements mounted file systems and processes symbolic links. 2017c478bd9Sstevel@tonic-gate * 2027c478bd9Sstevel@tonic-gate * vp is the vnode where the directory search should start. 2037c478bd9Sstevel@tonic-gate * 2047c478bd9Sstevel@tonic-gate * Reference counts: vp must be held prior to calling this function. rootvp 2057c478bd9Sstevel@tonic-gate * should only be held if rootvp != rootdir. 2067c478bd9Sstevel@tonic-gate */ 2077c478bd9Sstevel@tonic-gate int 2087c478bd9Sstevel@tonic-gate lookuppnvp( 2097c478bd9Sstevel@tonic-gate struct pathname *pnp, /* pathname to lookup */ 2107c478bd9Sstevel@tonic-gate struct pathname *rpnp, /* if non-NULL, return resolved path */ 2117c478bd9Sstevel@tonic-gate int flags, /* follow symlinks */ 2127c478bd9Sstevel@tonic-gate vnode_t **dirvpp, /* ptr for parent vnode */ 2137c478bd9Sstevel@tonic-gate vnode_t **compvpp, /* ptr for entry vnode */ 2147c478bd9Sstevel@tonic-gate vnode_t *rootvp, /* rootvp */ 2157c478bd9Sstevel@tonic-gate vnode_t *vp, /* directory to start search at */ 2167c478bd9Sstevel@tonic-gate cred_t *cr) /* user's credential */ 2177c478bd9Sstevel@tonic-gate { 2187c478bd9Sstevel@tonic-gate vnode_t *cvp; /* current component vp */ 2197c478bd9Sstevel@tonic-gate vnode_t *tvp; /* addressable temp ptr */ 2207c478bd9Sstevel@tonic-gate char component[MAXNAMELEN]; /* buffer for component (incl null) */ 2217c478bd9Sstevel@tonic-gate int error; 2227c478bd9Sstevel@tonic-gate int nlink; 2237c478bd9Sstevel@tonic-gate int lookup_flags; 224da6c28aaSamw struct pathname presrvd; /* case preserved name */ 225da6c28aaSamw struct pathname *pp = NULL; 2267c478bd9Sstevel@tonic-gate vnode_t *startvp; 2277c478bd9Sstevel@tonic-gate vnode_t *zonevp = curproc->p_zone->zone_rootvp; /* zone root */ 2287c478bd9Sstevel@tonic-gate int must_be_directory = 0; 22953ebc32aSVallish Vaidyeshwara boolean_t retry_with_kcred; 230005d3febSMarek Pospisil uint32_t auditing = AU_AUDITING(); 2317c478bd9Sstevel@tonic-gate 2327c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(CPU, sys, namei, 1); 2337c478bd9Sstevel@tonic-gate nlink = 0; 2347c478bd9Sstevel@tonic-gate cvp = NULL; 2357c478bd9Sstevel@tonic-gate if (rpnp) 2367c478bd9Sstevel@tonic-gate rpnp->pn_pathlen = 0; 237da6c28aaSamw 2387c478bd9Sstevel@tonic-gate lookup_flags = dirvpp ? LOOKUP_DIR : 0; 239da6c28aaSamw if (flags & FIGNORECASE) { 240da6c28aaSamw lookup_flags |= FIGNORECASE; 241da6c28aaSamw pn_alloc(&presrvd); 242da6c28aaSamw pp = &presrvd; 243da6c28aaSamw } 244da6c28aaSamw 245005d3febSMarek Pospisil if (auditing) 2467c478bd9Sstevel@tonic-gate audit_anchorpath(pnp, vp == rootvp); 2477c478bd9Sstevel@tonic-gate 2487c478bd9Sstevel@tonic-gate /* 2497c478bd9Sstevel@tonic-gate * Eliminate any trailing slashes in the pathname. 2507c478bd9Sstevel@tonic-gate * If there are any, we must follow all symlinks. 2517c478bd9Sstevel@tonic-gate * Also, we must guarantee that the last component is a directory. 2527c478bd9Sstevel@tonic-gate */ 2537c478bd9Sstevel@tonic-gate if (pn_fixslash(pnp)) { 2547c478bd9Sstevel@tonic-gate flags |= FOLLOW; 2557c478bd9Sstevel@tonic-gate must_be_directory = 1; 2567c478bd9Sstevel@tonic-gate } 2577c478bd9Sstevel@tonic-gate 2587c478bd9Sstevel@tonic-gate startvp = vp; 2597c478bd9Sstevel@tonic-gate next: 26053ebc32aSVallish Vaidyeshwara retry_with_kcred = B_FALSE; 26153ebc32aSVallish Vaidyeshwara 2627c478bd9Sstevel@tonic-gate /* 2637c478bd9Sstevel@tonic-gate * Make sure we have a directory. 2647c478bd9Sstevel@tonic-gate */ 2657c478bd9Sstevel@tonic-gate if (vp->v_type != VDIR) { 2667c478bd9Sstevel@tonic-gate error = ENOTDIR; 2677c478bd9Sstevel@tonic-gate goto bad; 2687c478bd9Sstevel@tonic-gate } 2697c478bd9Sstevel@tonic-gate 2707c478bd9Sstevel@tonic-gate if (rpnp && VN_CMP(vp, rootvp)) 2717c478bd9Sstevel@tonic-gate (void) pn_set(rpnp, "/"); 2727c478bd9Sstevel@tonic-gate 2737c478bd9Sstevel@tonic-gate /* 2747c478bd9Sstevel@tonic-gate * Process the next component of the pathname. 2757c478bd9Sstevel@tonic-gate */ 2767c478bd9Sstevel@tonic-gate if (error = pn_getcomponent(pnp, component)) { 2777c478bd9Sstevel@tonic-gate goto bad; 2787c478bd9Sstevel@tonic-gate } 2797c478bd9Sstevel@tonic-gate 2807c478bd9Sstevel@tonic-gate /* 2817c478bd9Sstevel@tonic-gate * Handle "..": two special cases. 2827c478bd9Sstevel@tonic-gate * 1. If we're at the root directory (e.g. after chroot or 2837c478bd9Sstevel@tonic-gate * zone_enter) then change ".." to "." so we can't get 2847c478bd9Sstevel@tonic-gate * out of this subtree. 2857c478bd9Sstevel@tonic-gate * 2. If this vnode is the root of a mounted file system, 2867c478bd9Sstevel@tonic-gate * then replace it with the vnode that was mounted on 2877c478bd9Sstevel@tonic-gate * so that we take the ".." in the other file system. 2887c478bd9Sstevel@tonic-gate */ 2897c478bd9Sstevel@tonic-gate if (component[0] == '.' && component[1] == '.' && component[2] == 0) { 2907c478bd9Sstevel@tonic-gate checkforroot: 2917c478bd9Sstevel@tonic-gate if (VN_CMP(vp, rootvp) || VN_CMP(vp, zonevp)) { 2927c478bd9Sstevel@tonic-gate component[1] = '\0'; 2937c478bd9Sstevel@tonic-gate } else if (vp->v_flag & VROOT) { 2947c478bd9Sstevel@tonic-gate vfs_t *vfsp; 2957c478bd9Sstevel@tonic-gate cvp = vp; 2967c478bd9Sstevel@tonic-gate 2977c478bd9Sstevel@tonic-gate /* 2987c478bd9Sstevel@tonic-gate * While we deal with the vfs pointer from the vnode 2997c478bd9Sstevel@tonic-gate * the filesystem could have been forcefully unmounted 3007c478bd9Sstevel@tonic-gate * and the vnode's v_vfsp could have been invalidated 3017c478bd9Sstevel@tonic-gate * by VFS_UNMOUNT. Hence, we cache v_vfsp and use it 3027c478bd9Sstevel@tonic-gate * with vfs_rlock_wait/vfs_unlock. 3037c478bd9Sstevel@tonic-gate * It is safe to use the v_vfsp even it is freed by 3047c478bd9Sstevel@tonic-gate * VFS_UNMOUNT because vfs_rlock_wait/vfs_unlock 3057c478bd9Sstevel@tonic-gate * do not dereference v_vfsp. It is just used as a 3067c478bd9Sstevel@tonic-gate * magic cookie. 3077c478bd9Sstevel@tonic-gate * One more corner case here is the memory getting 3087c478bd9Sstevel@tonic-gate * reused for another vfs structure. In this case 3097c478bd9Sstevel@tonic-gate * lookuppnvp's vfs_rlock_wait will succeed, domount's 3107c478bd9Sstevel@tonic-gate * vfs_lock will fail and domount will bail out with an 3117c478bd9Sstevel@tonic-gate * error (EBUSY). 3127c478bd9Sstevel@tonic-gate */ 3137c478bd9Sstevel@tonic-gate vfsp = cvp->v_vfsp; 3147c478bd9Sstevel@tonic-gate 3157c478bd9Sstevel@tonic-gate /* 3167c478bd9Sstevel@tonic-gate * This lock is used to synchronize 3177c478bd9Sstevel@tonic-gate * mounts/unmounts and lookups. 3187c478bd9Sstevel@tonic-gate * Threads doing mounts/unmounts hold the 3197c478bd9Sstevel@tonic-gate * writers version vfs_lock_wait(). 3207c478bd9Sstevel@tonic-gate */ 3217c478bd9Sstevel@tonic-gate 3227c478bd9Sstevel@tonic-gate vfs_rlock_wait(vfsp); 3237c478bd9Sstevel@tonic-gate 3247c478bd9Sstevel@tonic-gate /* 3257c478bd9Sstevel@tonic-gate * If this vnode is on a file system that 3267c478bd9Sstevel@tonic-gate * has been forcibly unmounted, 3277c478bd9Sstevel@tonic-gate * we can't proceed. Cancel this operation 3287c478bd9Sstevel@tonic-gate * and return EIO. 3297c478bd9Sstevel@tonic-gate * 3307c478bd9Sstevel@tonic-gate * vfs_vnodecovered is NULL if unmounted. 3317c478bd9Sstevel@tonic-gate * Currently, nfs uses VFS_UNMOUNTED to 3327c478bd9Sstevel@tonic-gate * check if it's a forced-umount. Keep the 3337c478bd9Sstevel@tonic-gate * same checking here as well even though it 3347c478bd9Sstevel@tonic-gate * may not be needed. 3357c478bd9Sstevel@tonic-gate */ 3367c478bd9Sstevel@tonic-gate if (((vp = cvp->v_vfsp->vfs_vnodecovered) == NULL) || 3377c478bd9Sstevel@tonic-gate (cvp->v_vfsp->vfs_flag & VFS_UNMOUNTED)) { 3387c478bd9Sstevel@tonic-gate vfs_unlock(vfsp); 3397c478bd9Sstevel@tonic-gate VN_RELE(cvp); 340da6c28aaSamw if (pp) 341da6c28aaSamw pn_free(pp); 3427c478bd9Sstevel@tonic-gate return (EIO); 3437c478bd9Sstevel@tonic-gate } 3447c478bd9Sstevel@tonic-gate VN_HOLD(vp); 3457c478bd9Sstevel@tonic-gate vfs_unlock(vfsp); 3467c478bd9Sstevel@tonic-gate VN_RELE(cvp); 3477c478bd9Sstevel@tonic-gate cvp = NULL; 3482e538c1cSvv /* 3492e538c1cSvv * Crossing mount points. For eg: We are doing 3502e538c1cSvv * a lookup of ".." for file systems root vnode 3512e538c1cSvv * mounted here, and VOP_LOOKUP() (with covered vnode) 3522e538c1cSvv * will be on underlying file systems mount point 3532e538c1cSvv * vnode. Set retry_with_kcred flag as we might end 3542e538c1cSvv * up doing VOP_LOOKUP() with kcred if required. 3552e538c1cSvv */ 3562e538c1cSvv retry_with_kcred = B_TRUE; 3577c478bd9Sstevel@tonic-gate goto checkforroot; 3587c478bd9Sstevel@tonic-gate } 3597c478bd9Sstevel@tonic-gate } 3607c478bd9Sstevel@tonic-gate 3617c478bd9Sstevel@tonic-gate /* 3627c478bd9Sstevel@tonic-gate * LOOKUP_CHECKREAD is a private flag used by vnodetopath() to indicate 3637c478bd9Sstevel@tonic-gate * that we need to have read permission on every directory in the entire 3647c478bd9Sstevel@tonic-gate * path. This is used to ensure that a forward-lookup of a cached value 3657c478bd9Sstevel@tonic-gate * has the same effect as a reverse-lookup when the cached value cannot 3667c478bd9Sstevel@tonic-gate * be found. 3677c478bd9Sstevel@tonic-gate */ 3687c478bd9Sstevel@tonic-gate if ((flags & LOOKUP_CHECKREAD) && 369da6c28aaSamw (error = VOP_ACCESS(vp, VREAD, 0, cr, NULL)) != 0) 3707c478bd9Sstevel@tonic-gate goto bad; 3717c478bd9Sstevel@tonic-gate 3727c478bd9Sstevel@tonic-gate /* 3737c478bd9Sstevel@tonic-gate * Perform a lookup in the current directory. 3747c478bd9Sstevel@tonic-gate */ 3757c478bd9Sstevel@tonic-gate error = VOP_LOOKUP(vp, component, &tvp, pnp, lookup_flags, 376da6c28aaSamw rootvp, cr, NULL, NULL, pp); 3772e538c1cSvv 3782e538c1cSvv /* 3792e538c1cSvv * Retry with kcred - If crossing mount points & error is EACCES. 3802e538c1cSvv * 3812e538c1cSvv * If we are crossing mount points here and doing ".." lookup, 3822e538c1cSvv * VOP_LOOKUP() might fail if the underlying file systems 3832e538c1cSvv * mount point has no execute permission. In cases like these, 3842e538c1cSvv * we retry VOP_LOOKUP() by giving as much privilage as possible 3852e538c1cSvv * by passing kcred credentials. 3862e538c1cSvv * 3872e538c1cSvv * In case of hierarchical file systems, passing kcred still may 3882e538c1cSvv * or may not work. 3892e538c1cSvv * For eg: UFS FS --> Mount NFS FS --> Again mount UFS on some 3902e538c1cSvv * directory inside NFS FS. 3912e538c1cSvv */ 3922e538c1cSvv if ((error == EACCES) && retry_with_kcred) 3932e538c1cSvv error = VOP_LOOKUP(vp, component, &tvp, pnp, lookup_flags, 394da6c28aaSamw rootvp, zone_kcred(), NULL, NULL, pp); 3952e538c1cSvv 3967c478bd9Sstevel@tonic-gate cvp = tvp; 3977c478bd9Sstevel@tonic-gate if (error) { 3987c478bd9Sstevel@tonic-gate cvp = NULL; 3997c478bd9Sstevel@tonic-gate /* 4007c478bd9Sstevel@tonic-gate * On error, return hard error if 4017c478bd9Sstevel@tonic-gate * (a) we're not at the end of the pathname yet, or 4027c478bd9Sstevel@tonic-gate * (b) the caller didn't want the parent directory, or 4037c478bd9Sstevel@tonic-gate * (c) we failed for some reason other than a missing entry. 4047c478bd9Sstevel@tonic-gate */ 4057c478bd9Sstevel@tonic-gate if (pn_pathleft(pnp) || dirvpp == NULL || error != ENOENT) 4067c478bd9Sstevel@tonic-gate goto bad; 407005d3febSMarek Pospisil if (auditing) { /* directory access */ 408*4a0fa546SMarek Pospisil if (error = audit_savepath(pnp, vp, vp, error, cr)) 4097c478bd9Sstevel@tonic-gate goto bad_noaudit; 4107c478bd9Sstevel@tonic-gate } 411*4a0fa546SMarek Pospisil 4127c478bd9Sstevel@tonic-gate pn_setlast(pnp); 4137c478bd9Sstevel@tonic-gate /* 4147c478bd9Sstevel@tonic-gate * We inform the caller that the desired entry must be 4157c478bd9Sstevel@tonic-gate * a directory by adding a '/' to the component name. 4167c478bd9Sstevel@tonic-gate */ 4177c478bd9Sstevel@tonic-gate if (must_be_directory && (error = pn_addslash(pnp)) != 0) 4187c478bd9Sstevel@tonic-gate goto bad; 4197c478bd9Sstevel@tonic-gate *dirvpp = vp; 4207c478bd9Sstevel@tonic-gate if (compvpp != NULL) 4217c478bd9Sstevel@tonic-gate *compvpp = NULL; 4227c478bd9Sstevel@tonic-gate if (rootvp != rootdir) 4237c478bd9Sstevel@tonic-gate VN_RELE(rootvp); 424da6c28aaSamw if (pp) 425da6c28aaSamw pn_free(pp); 4267c478bd9Sstevel@tonic-gate return (0); 4277c478bd9Sstevel@tonic-gate } 4287c478bd9Sstevel@tonic-gate 4297c478bd9Sstevel@tonic-gate /* 4307c478bd9Sstevel@tonic-gate * Traverse mount points. 4317c478bd9Sstevel@tonic-gate * XXX why don't we need to hold a read lock here (call vn_vfsrlock)? 4327c478bd9Sstevel@tonic-gate * What prevents a concurrent update to v_vfsmountedhere? 4337c478bd9Sstevel@tonic-gate * Possible answer: if mounting, we might not see the mount 4347c478bd9Sstevel@tonic-gate * if it is concurrently coming into existence, but that's 4357c478bd9Sstevel@tonic-gate * really not much different from the thread running a bit slower. 4367c478bd9Sstevel@tonic-gate * If unmounting, we may get into traverse() when we shouldn't, 4377c478bd9Sstevel@tonic-gate * but traverse() will catch this case for us. 4387c478bd9Sstevel@tonic-gate * (For this to work, fetching v_vfsmountedhere had better 4397c478bd9Sstevel@tonic-gate * be atomic!) 4407c478bd9Sstevel@tonic-gate */ 4417c478bd9Sstevel@tonic-gate if (vn_mountedvfs(cvp) != NULL) { 4427c478bd9Sstevel@tonic-gate tvp = cvp; 4437c478bd9Sstevel@tonic-gate if ((error = traverse(&tvp)) != 0) { 4447c478bd9Sstevel@tonic-gate /* 4457c478bd9Sstevel@tonic-gate * It is required to assign cvp here, because 4467c478bd9Sstevel@tonic-gate * traverse() will return a held vnode which 4477c478bd9Sstevel@tonic-gate * may different than the vnode that was passed 4487c478bd9Sstevel@tonic-gate * in (even in the error case). If traverse() 4497c478bd9Sstevel@tonic-gate * changes the vnode it releases the original, 4507c478bd9Sstevel@tonic-gate * and holds the new one. 4517c478bd9Sstevel@tonic-gate */ 4527c478bd9Sstevel@tonic-gate cvp = tvp; 4537c478bd9Sstevel@tonic-gate goto bad; 4547c478bd9Sstevel@tonic-gate } 4557c478bd9Sstevel@tonic-gate cvp = tvp; 4567c478bd9Sstevel@tonic-gate } 4577c478bd9Sstevel@tonic-gate 4587c478bd9Sstevel@tonic-gate /* 4597c478bd9Sstevel@tonic-gate * If we hit a symbolic link and there is more path to be 4607c478bd9Sstevel@tonic-gate * translated or this operation does not wish to apply 4617c478bd9Sstevel@tonic-gate * to a link, then place the contents of the link at the 4627c478bd9Sstevel@tonic-gate * front of the remaining pathname. 4637c478bd9Sstevel@tonic-gate */ 4647c478bd9Sstevel@tonic-gate if (cvp->v_type == VLNK && ((flags & FOLLOW) || pn_pathleft(pnp))) { 4657c478bd9Sstevel@tonic-gate struct pathname linkpath; 4667c478bd9Sstevel@tonic-gate 4677c478bd9Sstevel@tonic-gate if (++nlink > MAXSYMLINKS) { 4687c478bd9Sstevel@tonic-gate error = ELOOP; 4697c478bd9Sstevel@tonic-gate goto bad; 4707c478bd9Sstevel@tonic-gate } 4717c478bd9Sstevel@tonic-gate pn_alloc(&linkpath); 4727c478bd9Sstevel@tonic-gate if (error = pn_getsymlink(cvp, &linkpath, cr)) { 4737c478bd9Sstevel@tonic-gate pn_free(&linkpath); 4747c478bd9Sstevel@tonic-gate goto bad; 4757c478bd9Sstevel@tonic-gate } 4767c478bd9Sstevel@tonic-gate 477005d3febSMarek Pospisil if (auditing) 4787c478bd9Sstevel@tonic-gate audit_symlink(pnp, &linkpath); 4797c478bd9Sstevel@tonic-gate 4807c478bd9Sstevel@tonic-gate if (pn_pathleft(&linkpath) == 0) 4817c478bd9Sstevel@tonic-gate (void) pn_set(&linkpath, "."); 4827c478bd9Sstevel@tonic-gate error = pn_insert(pnp, &linkpath, strlen(component)); 4837c478bd9Sstevel@tonic-gate pn_free(&linkpath); 4847c478bd9Sstevel@tonic-gate if (error) 4857c478bd9Sstevel@tonic-gate goto bad; 4867c478bd9Sstevel@tonic-gate VN_RELE(cvp); 4877c478bd9Sstevel@tonic-gate cvp = NULL; 4887c478bd9Sstevel@tonic-gate if (pnp->pn_pathlen == 0) { 4897c478bd9Sstevel@tonic-gate error = ENOENT; 4907c478bd9Sstevel@tonic-gate goto bad; 4917c478bd9Sstevel@tonic-gate } 4927c478bd9Sstevel@tonic-gate if (pnp->pn_path[0] == '/') { 4937c478bd9Sstevel@tonic-gate do { 4947c478bd9Sstevel@tonic-gate pnp->pn_path++; 4957c478bd9Sstevel@tonic-gate pnp->pn_pathlen--; 4967c478bd9Sstevel@tonic-gate } while (pnp->pn_path[0] == '/'); 4977c478bd9Sstevel@tonic-gate VN_RELE(vp); 4987c478bd9Sstevel@tonic-gate vp = rootvp; 4997c478bd9Sstevel@tonic-gate VN_HOLD(vp); 5007c478bd9Sstevel@tonic-gate } 501005d3febSMarek Pospisil if (auditing) 5027c478bd9Sstevel@tonic-gate audit_anchorpath(pnp, vp == rootvp); 5037c478bd9Sstevel@tonic-gate if (pn_fixslash(pnp)) { 5047c478bd9Sstevel@tonic-gate flags |= FOLLOW; 5057c478bd9Sstevel@tonic-gate must_be_directory = 1; 5067c478bd9Sstevel@tonic-gate } 5077c478bd9Sstevel@tonic-gate goto next; 5087c478bd9Sstevel@tonic-gate } 5097c478bd9Sstevel@tonic-gate 5107c478bd9Sstevel@tonic-gate /* 5117c478bd9Sstevel@tonic-gate * If rpnp is non-NULL, remember the resolved path name therein. 5127c478bd9Sstevel@tonic-gate * Do not include "." components. Collapse occurrences of 5137c478bd9Sstevel@tonic-gate * "previous/..", so long as "previous" is not itself "..". 5147c478bd9Sstevel@tonic-gate * Exhausting rpnp results in error ENAMETOOLONG. 5157c478bd9Sstevel@tonic-gate */ 5167c478bd9Sstevel@tonic-gate if (rpnp && strcmp(component, ".") != 0) { 5177c478bd9Sstevel@tonic-gate size_t len; 5187c478bd9Sstevel@tonic-gate 5197c478bd9Sstevel@tonic-gate if (strcmp(component, "..") == 0 && 5207c478bd9Sstevel@tonic-gate rpnp->pn_pathlen != 0 && 5217c478bd9Sstevel@tonic-gate !((rpnp->pn_pathlen > 2 && 5227c478bd9Sstevel@tonic-gate strncmp(rpnp->pn_path+rpnp->pn_pathlen-3, "/..", 3) == 0) || 5237c478bd9Sstevel@tonic-gate (rpnp->pn_pathlen == 2 && 5247c478bd9Sstevel@tonic-gate strncmp(rpnp->pn_path, "..", 2) == 0))) { 5257c478bd9Sstevel@tonic-gate while (rpnp->pn_pathlen && 5267c478bd9Sstevel@tonic-gate rpnp->pn_path[rpnp->pn_pathlen-1] != '/') 5277c478bd9Sstevel@tonic-gate rpnp->pn_pathlen--; 5287c478bd9Sstevel@tonic-gate if (rpnp->pn_pathlen > 1) 5297c478bd9Sstevel@tonic-gate rpnp->pn_pathlen--; 5307c478bd9Sstevel@tonic-gate rpnp->pn_path[rpnp->pn_pathlen] = '\0'; 5317c478bd9Sstevel@tonic-gate } else { 5327c478bd9Sstevel@tonic-gate if (rpnp->pn_pathlen != 0 && 5337c478bd9Sstevel@tonic-gate rpnp->pn_path[rpnp->pn_pathlen-1] != '/') 5347c478bd9Sstevel@tonic-gate rpnp->pn_path[rpnp->pn_pathlen++] = '/'; 535da6c28aaSamw if (flags & FIGNORECASE) { 536da6c28aaSamw /* 537da6c28aaSamw * Return the case-preserved name 538da6c28aaSamw * within the resolved path. 539da6c28aaSamw */ 540ab04eb8eStimh error = copystr(pp->pn_buf, 541da6c28aaSamw rpnp->pn_path + rpnp->pn_pathlen, 542da6c28aaSamw rpnp->pn_bufsize - rpnp->pn_pathlen, &len); 543da6c28aaSamw } else { 544da6c28aaSamw error = copystr(component, 545da6c28aaSamw rpnp->pn_path + rpnp->pn_pathlen, 546da6c28aaSamw rpnp->pn_bufsize - rpnp->pn_pathlen, &len); 547da6c28aaSamw } 5487c478bd9Sstevel@tonic-gate if (error) /* copystr() returns ENAMETOOLONG */ 5497c478bd9Sstevel@tonic-gate goto bad; 5507c478bd9Sstevel@tonic-gate rpnp->pn_pathlen += (len - 1); 5517c478bd9Sstevel@tonic-gate ASSERT(rpnp->pn_bufsize > rpnp->pn_pathlen); 5527c478bd9Sstevel@tonic-gate } 5537c478bd9Sstevel@tonic-gate } 5547c478bd9Sstevel@tonic-gate 5557c478bd9Sstevel@tonic-gate /* 5567c478bd9Sstevel@tonic-gate * If no more components, return last directory (if wanted) and 5577c478bd9Sstevel@tonic-gate * last component (if wanted). 5587c478bd9Sstevel@tonic-gate */ 5597c478bd9Sstevel@tonic-gate if (pn_pathleft(pnp) == 0) { 5607c478bd9Sstevel@tonic-gate /* 5617c478bd9Sstevel@tonic-gate * If there was a trailing slash in the pathname, 5627c478bd9Sstevel@tonic-gate * make sure the last component is a directory. 5637c478bd9Sstevel@tonic-gate */ 5647c478bd9Sstevel@tonic-gate if (must_be_directory && cvp->v_type != VDIR) { 5657c478bd9Sstevel@tonic-gate error = ENOTDIR; 5667c478bd9Sstevel@tonic-gate goto bad; 5677c478bd9Sstevel@tonic-gate } 5687c478bd9Sstevel@tonic-gate if (dirvpp != NULL) { 5697c478bd9Sstevel@tonic-gate /* 5707c478bd9Sstevel@tonic-gate * Check that we have the real parent and not 5717c478bd9Sstevel@tonic-gate * an alias of the last component. 5727c478bd9Sstevel@tonic-gate */ 5737c478bd9Sstevel@tonic-gate if (vn_compare(vp, cvp)) { 574005d3febSMarek Pospisil if (auditing) 575*4a0fa546SMarek Pospisil (void) audit_savepath(pnp, cvp, vp, 5762e538c1cSvv EINVAL, cr); 5777c478bd9Sstevel@tonic-gate pn_setlast(pnp); 5787c478bd9Sstevel@tonic-gate VN_RELE(vp); 5797c478bd9Sstevel@tonic-gate VN_RELE(cvp); 5807c478bd9Sstevel@tonic-gate if (rootvp != rootdir) 5817c478bd9Sstevel@tonic-gate VN_RELE(rootvp); 582da6c28aaSamw if (pp) 583da6c28aaSamw pn_free(pp); 5847c478bd9Sstevel@tonic-gate return (EINVAL); 5857c478bd9Sstevel@tonic-gate } 5867c478bd9Sstevel@tonic-gate *dirvpp = vp; 5877c478bd9Sstevel@tonic-gate } else 5887c478bd9Sstevel@tonic-gate VN_RELE(vp); 589005d3febSMarek Pospisil if (auditing) 590*4a0fa546SMarek Pospisil (void) audit_savepath(pnp, cvp, vp, 0, cr); 5917c478bd9Sstevel@tonic-gate if (pnp->pn_path == pnp->pn_buf) 5927c478bd9Sstevel@tonic-gate (void) pn_set(pnp, "."); 5937c478bd9Sstevel@tonic-gate else 5947c478bd9Sstevel@tonic-gate pn_setlast(pnp); 5957c478bd9Sstevel@tonic-gate if (rpnp) { 5967c478bd9Sstevel@tonic-gate if (VN_CMP(cvp, rootvp)) 5977c478bd9Sstevel@tonic-gate (void) pn_set(rpnp, "/"); 5987c478bd9Sstevel@tonic-gate else if (rpnp->pn_pathlen == 0) 5997c478bd9Sstevel@tonic-gate (void) pn_set(rpnp, "."); 6007c478bd9Sstevel@tonic-gate } 6017c478bd9Sstevel@tonic-gate 6027c478bd9Sstevel@tonic-gate if (compvpp != NULL) 6037c478bd9Sstevel@tonic-gate *compvpp = cvp; 6047c478bd9Sstevel@tonic-gate else 6057c478bd9Sstevel@tonic-gate VN_RELE(cvp); 6067c478bd9Sstevel@tonic-gate if (rootvp != rootdir) 6077c478bd9Sstevel@tonic-gate VN_RELE(rootvp); 608da6c28aaSamw if (pp) 609da6c28aaSamw pn_free(pp); 6107c478bd9Sstevel@tonic-gate return (0); 6117c478bd9Sstevel@tonic-gate } 6127c478bd9Sstevel@tonic-gate 6137c478bd9Sstevel@tonic-gate /* 6147c478bd9Sstevel@tonic-gate * Skip over slashes from end of last component. 6157c478bd9Sstevel@tonic-gate */ 6167c478bd9Sstevel@tonic-gate while (pnp->pn_path[0] == '/') { 6177c478bd9Sstevel@tonic-gate pnp->pn_path++; 6187c478bd9Sstevel@tonic-gate pnp->pn_pathlen--; 6197c478bd9Sstevel@tonic-gate } 6207c478bd9Sstevel@tonic-gate 6217c478bd9Sstevel@tonic-gate /* 6227c478bd9Sstevel@tonic-gate * Searched through another level of directory: 6237c478bd9Sstevel@tonic-gate * release previous directory handle and save new (result 6247c478bd9Sstevel@tonic-gate * of lookup) as current directory. 6257c478bd9Sstevel@tonic-gate */ 6267c478bd9Sstevel@tonic-gate VN_RELE(vp); 6277c478bd9Sstevel@tonic-gate vp = cvp; 6287c478bd9Sstevel@tonic-gate cvp = NULL; 6297c478bd9Sstevel@tonic-gate goto next; 6307c478bd9Sstevel@tonic-gate 6317c478bd9Sstevel@tonic-gate bad: 632005d3febSMarek Pospisil if (auditing) /* reached end of path */ 633*4a0fa546SMarek Pospisil (void) audit_savepath(pnp, cvp, vp, error, cr); 6347c478bd9Sstevel@tonic-gate bad_noaudit: 6357c478bd9Sstevel@tonic-gate /* 6367c478bd9Sstevel@tonic-gate * Error. Release vnodes and return. 6377c478bd9Sstevel@tonic-gate */ 6387c478bd9Sstevel@tonic-gate if (cvp) 6397c478bd9Sstevel@tonic-gate VN_RELE(cvp); 6407c478bd9Sstevel@tonic-gate /* 6417c478bd9Sstevel@tonic-gate * If the error was ESTALE and the current directory to look in 6427c478bd9Sstevel@tonic-gate * was the root for this lookup, the root for a mounted file 6437c478bd9Sstevel@tonic-gate * system, or the starting directory for lookups, then 6447c478bd9Sstevel@tonic-gate * return ENOENT instead of ESTALE. In this case, no recovery 6457c478bd9Sstevel@tonic-gate * is possible by the higher level. If ESTALE was returned for 6467c478bd9Sstevel@tonic-gate * some intermediate directory along the path, then recovery 6477c478bd9Sstevel@tonic-gate * is potentially possible and retrying from the higher level 6487c478bd9Sstevel@tonic-gate * will either correct the situation by purging stale cache 6497c478bd9Sstevel@tonic-gate * entries or eventually get back to the point where no recovery 6507c478bd9Sstevel@tonic-gate * is possible. 6517c478bd9Sstevel@tonic-gate */ 6527c478bd9Sstevel@tonic-gate if (error == ESTALE && 6537c478bd9Sstevel@tonic-gate (VN_CMP(vp, rootvp) || (vp->v_flag & VROOT) || vp == startvp)) 6547c478bd9Sstevel@tonic-gate error = ENOENT; 6557c478bd9Sstevel@tonic-gate VN_RELE(vp); 6567c478bd9Sstevel@tonic-gate if (rootvp != rootdir) 6577c478bd9Sstevel@tonic-gate VN_RELE(rootvp); 658da6c28aaSamw if (pp) 659da6c28aaSamw pn_free(pp); 6607c478bd9Sstevel@tonic-gate return (error); 6617c478bd9Sstevel@tonic-gate } 6627c478bd9Sstevel@tonic-gate 6637c478bd9Sstevel@tonic-gate /* 6647c478bd9Sstevel@tonic-gate * Traverse a mount point. Routine accepts a vnode pointer as a reference 6657c478bd9Sstevel@tonic-gate * parameter and performs the indirection, releasing the original vnode. 6667c478bd9Sstevel@tonic-gate */ 6677c478bd9Sstevel@tonic-gate int 6687c478bd9Sstevel@tonic-gate traverse(vnode_t **cvpp) 6697c478bd9Sstevel@tonic-gate { 6707c478bd9Sstevel@tonic-gate int error = 0; 6717c478bd9Sstevel@tonic-gate vnode_t *cvp; 6727c478bd9Sstevel@tonic-gate vnode_t *tvp; 6737c478bd9Sstevel@tonic-gate vfs_t *vfsp; 6747c478bd9Sstevel@tonic-gate 6757c478bd9Sstevel@tonic-gate cvp = *cvpp; 6767c478bd9Sstevel@tonic-gate 6777c478bd9Sstevel@tonic-gate /* 6787c478bd9Sstevel@tonic-gate * If this vnode is mounted on, then we transparently indirect 6797c478bd9Sstevel@tonic-gate * to the vnode which is the root of the mounted file system. 6807c478bd9Sstevel@tonic-gate * Before we do this we must check that an unmount is not in 6817c478bd9Sstevel@tonic-gate * progress on this vnode. 6827c478bd9Sstevel@tonic-gate */ 6837c478bd9Sstevel@tonic-gate 6847c478bd9Sstevel@tonic-gate for (;;) { 6857c478bd9Sstevel@tonic-gate /* 6867c478bd9Sstevel@tonic-gate * Try to read lock the vnode. If this fails because 6877c478bd9Sstevel@tonic-gate * the vnode is already write locked, then check to 6887c478bd9Sstevel@tonic-gate * see whether it is the current thread which locked 6897c478bd9Sstevel@tonic-gate * the vnode. If it is not, then read lock the vnode 6907c478bd9Sstevel@tonic-gate * by waiting to acquire the lock. 6917c478bd9Sstevel@tonic-gate * 6927c478bd9Sstevel@tonic-gate * The code path in domount() is an example of support 6937c478bd9Sstevel@tonic-gate * which needs to look up two pathnames and locks one 6947c478bd9Sstevel@tonic-gate * of them in between the two lookups. 6957c478bd9Sstevel@tonic-gate */ 6967c478bd9Sstevel@tonic-gate error = vn_vfsrlock(cvp); 6977c478bd9Sstevel@tonic-gate if (error) { 6987c478bd9Sstevel@tonic-gate if (!vn_vfswlock_held(cvp)) 6997c478bd9Sstevel@tonic-gate error = vn_vfsrlock_wait(cvp); 7007c478bd9Sstevel@tonic-gate if (error != 0) { 7017c478bd9Sstevel@tonic-gate /* 7027c478bd9Sstevel@tonic-gate * lookuppn() expects a held vnode to be 7037c478bd9Sstevel@tonic-gate * returned because it promptly calls 7047c478bd9Sstevel@tonic-gate * VN_RELE after the error return 7057c478bd9Sstevel@tonic-gate */ 7067c478bd9Sstevel@tonic-gate *cvpp = cvp; 7077c478bd9Sstevel@tonic-gate return (error); 7087c478bd9Sstevel@tonic-gate } 7097c478bd9Sstevel@tonic-gate } 7107c478bd9Sstevel@tonic-gate 7117c478bd9Sstevel@tonic-gate /* 7127c478bd9Sstevel@tonic-gate * Reached the end of the mount chain? 7137c478bd9Sstevel@tonic-gate */ 7147c478bd9Sstevel@tonic-gate vfsp = vn_mountedvfs(cvp); 7157c478bd9Sstevel@tonic-gate if (vfsp == NULL) { 7167c478bd9Sstevel@tonic-gate vn_vfsunlock(cvp); 7177c478bd9Sstevel@tonic-gate break; 7187c478bd9Sstevel@tonic-gate } 7197c478bd9Sstevel@tonic-gate 7207c478bd9Sstevel@tonic-gate /* 7217c478bd9Sstevel@tonic-gate * The read lock must be held across the call to VFS_ROOT() to 7227c478bd9Sstevel@tonic-gate * prevent a concurrent unmount from destroying the vfs. 7237c478bd9Sstevel@tonic-gate */ 7247c478bd9Sstevel@tonic-gate error = VFS_ROOT(vfsp, &tvp); 7257c478bd9Sstevel@tonic-gate vn_vfsunlock(cvp); 7267c478bd9Sstevel@tonic-gate 7277c478bd9Sstevel@tonic-gate if (error) 7287c478bd9Sstevel@tonic-gate break; 7297c478bd9Sstevel@tonic-gate 7307c478bd9Sstevel@tonic-gate VN_RELE(cvp); 7317c478bd9Sstevel@tonic-gate 7327c478bd9Sstevel@tonic-gate cvp = tvp; 7337c478bd9Sstevel@tonic-gate } 7347c478bd9Sstevel@tonic-gate 7357c478bd9Sstevel@tonic-gate *cvpp = cvp; 7367c478bd9Sstevel@tonic-gate return (error); 7377c478bd9Sstevel@tonic-gate } 7387c478bd9Sstevel@tonic-gate 7397c478bd9Sstevel@tonic-gate /* 7407c478bd9Sstevel@tonic-gate * Return the lowermost vnode if this is a mountpoint. 7417c478bd9Sstevel@tonic-gate */ 7427c478bd9Sstevel@tonic-gate static vnode_t * 7437c478bd9Sstevel@tonic-gate vn_under(vnode_t *vp) 7447c478bd9Sstevel@tonic-gate { 7457c478bd9Sstevel@tonic-gate vnode_t *uvp; 7467c478bd9Sstevel@tonic-gate vfs_t *vfsp; 7477c478bd9Sstevel@tonic-gate 7487c478bd9Sstevel@tonic-gate while (vp->v_flag & VROOT) { 7497c478bd9Sstevel@tonic-gate 7507c478bd9Sstevel@tonic-gate vfsp = vp->v_vfsp; 7517c478bd9Sstevel@tonic-gate vfs_rlock_wait(vfsp); 7527c478bd9Sstevel@tonic-gate if ((uvp = vfsp->vfs_vnodecovered) == NULL || 7537c478bd9Sstevel@tonic-gate (vfsp->vfs_flag & VFS_UNMOUNTED)) { 7547c478bd9Sstevel@tonic-gate vfs_unlock(vfsp); 7557c478bd9Sstevel@tonic-gate break; 7567c478bd9Sstevel@tonic-gate } 7577c478bd9Sstevel@tonic-gate VN_HOLD(uvp); 7587c478bd9Sstevel@tonic-gate vfs_unlock(vfsp); 7597c478bd9Sstevel@tonic-gate VN_RELE(vp); 7607c478bd9Sstevel@tonic-gate vp = uvp; 7617c478bd9Sstevel@tonic-gate } 7627c478bd9Sstevel@tonic-gate 7637c478bd9Sstevel@tonic-gate return (vp); 7647c478bd9Sstevel@tonic-gate } 7657c478bd9Sstevel@tonic-gate 7667c478bd9Sstevel@tonic-gate static int 7677c478bd9Sstevel@tonic-gate vnode_match(vnode_t *v1, vnode_t *v2, cred_t *cr) 7687c478bd9Sstevel@tonic-gate { 7697c478bd9Sstevel@tonic-gate vattr_t v1attr, v2attr; 7707c478bd9Sstevel@tonic-gate 7717c478bd9Sstevel@tonic-gate /* 7727c478bd9Sstevel@tonic-gate * If we have a device file, check to see if is a cloned open of the 7737c478bd9Sstevel@tonic-gate * same device. For self-cloning devices, the major numbers will match. 7747c478bd9Sstevel@tonic-gate * For devices cloned through the 'clone' driver, the minor number of 7757c478bd9Sstevel@tonic-gate * the source device will be the same as the major number of the cloned 7767c478bd9Sstevel@tonic-gate * device. 7777c478bd9Sstevel@tonic-gate */ 7787c478bd9Sstevel@tonic-gate if ((v1->v_type == VCHR || v1->v_type == VBLK) && 7797c478bd9Sstevel@tonic-gate v1->v_type == v2->v_type) { 7807c478bd9Sstevel@tonic-gate if ((spec_is_selfclone(v1) || spec_is_selfclone(v2)) && 7817c478bd9Sstevel@tonic-gate getmajor(v1->v_rdev) == getmajor(v2->v_rdev)) 7827c478bd9Sstevel@tonic-gate return (1); 7837c478bd9Sstevel@tonic-gate 7847c478bd9Sstevel@tonic-gate if (spec_is_clone(v1) && 7857c478bd9Sstevel@tonic-gate getmajor(v1->v_rdev) == getminor(v2->v_rdev)) 7867c478bd9Sstevel@tonic-gate return (1); 7877c478bd9Sstevel@tonic-gate 7887c478bd9Sstevel@tonic-gate if (spec_is_clone(v2) && 7897c478bd9Sstevel@tonic-gate getmajor(v2->v_rdev) == getminor(v1->v_rdev)) 7907c478bd9Sstevel@tonic-gate return (1); 7917c478bd9Sstevel@tonic-gate } 7927c478bd9Sstevel@tonic-gate 7937c478bd9Sstevel@tonic-gate v1attr.va_mask = v2attr.va_mask = AT_TYPE; 7947c478bd9Sstevel@tonic-gate 7957c478bd9Sstevel@tonic-gate /* 7967c478bd9Sstevel@tonic-gate * This check for symbolic links handles the pseudo-symlinks in procfs. 7977c478bd9Sstevel@tonic-gate * These particular links have v_type of VDIR, but the attributes have a 7987c478bd9Sstevel@tonic-gate * type of VLNK. We need to avoid these links because otherwise if we 7997c478bd9Sstevel@tonic-gate * are currently in '/proc/self/fd', then '/proc/self/cwd' will compare 8007c478bd9Sstevel@tonic-gate * as the same vnode. 8017c478bd9Sstevel@tonic-gate */ 802da6c28aaSamw if (VOP_GETATTR(v1, &v1attr, 0, cr, NULL) != 0 || 803da6c28aaSamw VOP_GETATTR(v2, &v2attr, 0, cr, NULL) != 0 || 8047c478bd9Sstevel@tonic-gate v1attr.va_type == VLNK || v2attr.va_type == VLNK) 8057c478bd9Sstevel@tonic-gate return (0); 8067c478bd9Sstevel@tonic-gate 8077c478bd9Sstevel@tonic-gate v1attr.va_mask = v2attr.va_mask = AT_TYPE | AT_FSID | AT_NODEID; 8087c478bd9Sstevel@tonic-gate 809da6c28aaSamw if (VOP_GETATTR(v1, &v1attr, ATTR_REAL, cr, NULL) != 0 || 810da6c28aaSamw VOP_GETATTR(v2, &v2attr, ATTR_REAL, cr, NULL) != 0) 8117c478bd9Sstevel@tonic-gate return (0); 8127c478bd9Sstevel@tonic-gate 8137c478bd9Sstevel@tonic-gate return (v1attr.va_fsid == v2attr.va_fsid && 8147c478bd9Sstevel@tonic-gate v1attr.va_nodeid == v2attr.va_nodeid); 8157c478bd9Sstevel@tonic-gate } 8167c478bd9Sstevel@tonic-gate 8177c478bd9Sstevel@tonic-gate 8187c478bd9Sstevel@tonic-gate /* 8197c478bd9Sstevel@tonic-gate * Find the entry in the directory corresponding to the target vnode. 8207c478bd9Sstevel@tonic-gate */ 8217c478bd9Sstevel@tonic-gate int 8227c478bd9Sstevel@tonic-gate dirfindvp(vnode_t *vrootp, vnode_t *dvp, vnode_t *tvp, cred_t *cr, char *dbuf, 8237c478bd9Sstevel@tonic-gate size_t dlen, dirent64_t **rdp) 8247c478bd9Sstevel@tonic-gate { 8257c478bd9Sstevel@tonic-gate size_t dbuflen; 8267c478bd9Sstevel@tonic-gate struct iovec iov; 8277c478bd9Sstevel@tonic-gate struct uio uio; 828fa9e4066Sahrens int error; 8297c478bd9Sstevel@tonic-gate int eof; 8307c478bd9Sstevel@tonic-gate vnode_t *cmpvp; 8317c478bd9Sstevel@tonic-gate struct dirent64 *dp; 8327c478bd9Sstevel@tonic-gate pathname_t pnp; 8337c478bd9Sstevel@tonic-gate 8347c478bd9Sstevel@tonic-gate ASSERT(dvp->v_type == VDIR); 8357c478bd9Sstevel@tonic-gate 8367c478bd9Sstevel@tonic-gate /* 8377c478bd9Sstevel@tonic-gate * This is necessary because of the strange semantics of VOP_LOOKUP(). 8387c478bd9Sstevel@tonic-gate */ 8397c478bd9Sstevel@tonic-gate bzero(&pnp, sizeof (pnp)); 8407c478bd9Sstevel@tonic-gate 8417c478bd9Sstevel@tonic-gate eof = 0; 8427c478bd9Sstevel@tonic-gate 8437c478bd9Sstevel@tonic-gate uio.uio_iov = &iov; 8447c478bd9Sstevel@tonic-gate uio.uio_iovcnt = 1; 8457c478bd9Sstevel@tonic-gate uio.uio_segflg = UIO_SYSSPACE; 8467c478bd9Sstevel@tonic-gate uio.uio_fmode = 0; 8477c478bd9Sstevel@tonic-gate uio.uio_extflg = UIO_COPY_CACHED; 8487c478bd9Sstevel@tonic-gate uio.uio_loffset = 0; 8497c478bd9Sstevel@tonic-gate 850da6c28aaSamw if ((error = VOP_ACCESS(dvp, VREAD, 0, cr, NULL)) != 0) 851fa9e4066Sahrens return (error); 8527c478bd9Sstevel@tonic-gate 8537c478bd9Sstevel@tonic-gate while (!eof) { 8547c478bd9Sstevel@tonic-gate uio.uio_resid = dlen; 8557c478bd9Sstevel@tonic-gate iov.iov_base = dbuf; 8567c478bd9Sstevel@tonic-gate iov.iov_len = dlen; 8577c478bd9Sstevel@tonic-gate 8587c478bd9Sstevel@tonic-gate (void) VOP_RWLOCK(dvp, V_WRITELOCK_FALSE, NULL); 859da6c28aaSamw error = VOP_READDIR(dvp, &uio, cr, &eof, NULL, 0); 8607c478bd9Sstevel@tonic-gate VOP_RWUNLOCK(dvp, V_WRITELOCK_FALSE, NULL); 8617c478bd9Sstevel@tonic-gate 8627c478bd9Sstevel@tonic-gate dbuflen = dlen - uio.uio_resid; 8637c478bd9Sstevel@tonic-gate 864fa9e4066Sahrens if (error || dbuflen == 0) 8657c478bd9Sstevel@tonic-gate break; 8667c478bd9Sstevel@tonic-gate 8677c478bd9Sstevel@tonic-gate dp = (dirent64_t *)dbuf; 8687c478bd9Sstevel@tonic-gate while ((intptr_t)dp < (intptr_t)dbuf + dbuflen) { 8697c478bd9Sstevel@tonic-gate /* 8707c478bd9Sstevel@tonic-gate * Ignore '.' and '..' entries 8717c478bd9Sstevel@tonic-gate */ 8727c478bd9Sstevel@tonic-gate if (strcmp(dp->d_name, ".") == 0 || 8737c478bd9Sstevel@tonic-gate strcmp(dp->d_name, "..") == 0) { 8747c478bd9Sstevel@tonic-gate dp = (dirent64_t *)((intptr_t)dp + 8757c478bd9Sstevel@tonic-gate dp->d_reclen); 8767c478bd9Sstevel@tonic-gate continue; 8777c478bd9Sstevel@tonic-gate } 8787c478bd9Sstevel@tonic-gate 879fa9e4066Sahrens error = VOP_LOOKUP(dvp, dp->d_name, &cmpvp, &pnp, 0, 880da6c28aaSamw vrootp, cr, NULL, NULL, NULL); 8817c478bd9Sstevel@tonic-gate 8827c478bd9Sstevel@tonic-gate /* 8837c478bd9Sstevel@tonic-gate * We only want to bail out if there was an error other 8847c478bd9Sstevel@tonic-gate * than ENOENT. Otherwise, it could be that someone 8857c478bd9Sstevel@tonic-gate * just removed an entry since the readdir() call, and 8867c478bd9Sstevel@tonic-gate * the entry we want is further on in the directory. 8877c478bd9Sstevel@tonic-gate */ 888fa9e4066Sahrens if (error == 0) { 8897c478bd9Sstevel@tonic-gate if (vnode_match(tvp, cmpvp, cr)) { 8907c478bd9Sstevel@tonic-gate VN_RELE(cmpvp); 8917c478bd9Sstevel@tonic-gate *rdp = dp; 8927c478bd9Sstevel@tonic-gate return (0); 8937c478bd9Sstevel@tonic-gate } 8947c478bd9Sstevel@tonic-gate 8957c478bd9Sstevel@tonic-gate VN_RELE(cmpvp); 896fa9e4066Sahrens } else if (error != ENOENT) { 897fa9e4066Sahrens return (error); 8987c478bd9Sstevel@tonic-gate } 8997c478bd9Sstevel@tonic-gate 9007c478bd9Sstevel@tonic-gate dp = (dirent64_t *)((intptr_t)dp + dp->d_reclen); 9017c478bd9Sstevel@tonic-gate } 9027c478bd9Sstevel@tonic-gate } 9037c478bd9Sstevel@tonic-gate 9047c478bd9Sstevel@tonic-gate /* 9057c478bd9Sstevel@tonic-gate * Something strange has happened, this directory does not contain the 9067c478bd9Sstevel@tonic-gate * specified vnode. This should never happen in the normal case, since 907fa9e4066Sahrens * we ensured that dvp is the parent of vp. This is possible in some 908fa9e4066Sahrens * rare conditions (races and the special .zfs directory). 9097c478bd9Sstevel@tonic-gate */ 910fa9e4066Sahrens if (error == 0) { 911da6c28aaSamw error = VOP_LOOKUP(dvp, ".zfs", &cmpvp, &pnp, 0, vrootp, cr, 912da6c28aaSamw NULL, NULL, NULL); 913fa9e4066Sahrens if (error == 0) { 914fa9e4066Sahrens if (vnode_match(tvp, cmpvp, cr)) { 915fa9e4066Sahrens (void) strcpy(dp->d_name, ".zfs"); 916fa9e4066Sahrens dp->d_reclen = strlen(".zfs"); 917fa9e4066Sahrens dp->d_off = 2; 918fa9e4066Sahrens dp->d_ino = 1; 919fa9e4066Sahrens *rdp = dp; 920fa9e4066Sahrens } else { 921fa9e4066Sahrens error = ENOENT; 922fa9e4066Sahrens } 923fa9e4066Sahrens VN_RELE(cmpvp); 924fa9e4066Sahrens } 925fa9e4066Sahrens } 9267c478bd9Sstevel@tonic-gate 927fa9e4066Sahrens return (error); 9287c478bd9Sstevel@tonic-gate } 9297c478bd9Sstevel@tonic-gate 9307c478bd9Sstevel@tonic-gate /* 9317c478bd9Sstevel@tonic-gate * Given a global path (from rootdir), and a vnode that is the current root, 9327c478bd9Sstevel@tonic-gate * return the portion of the path that is beneath the current root or NULL on 9337c478bd9Sstevel@tonic-gate * failure. The path MUST be a resolved path (no '..' entries or symlinks), 9347c478bd9Sstevel@tonic-gate * otherwise this function will fail. 9357c478bd9Sstevel@tonic-gate */ 9367c478bd9Sstevel@tonic-gate static char * 9377c478bd9Sstevel@tonic-gate localpath(char *path, struct vnode *vrootp, cred_t *cr) 9387c478bd9Sstevel@tonic-gate { 9397c478bd9Sstevel@tonic-gate vnode_t *vp; 9407c478bd9Sstevel@tonic-gate vnode_t *cvp; 9417c478bd9Sstevel@tonic-gate char component[MAXNAMELEN]; 9427c478bd9Sstevel@tonic-gate char *ret = NULL; 9437c478bd9Sstevel@tonic-gate pathname_t pn; 9447c478bd9Sstevel@tonic-gate 9457c478bd9Sstevel@tonic-gate /* 9467c478bd9Sstevel@tonic-gate * We use vn_compare() instead of VN_CMP() in order to detect lofs 9477c478bd9Sstevel@tonic-gate * mounts and stacked vnodes. 9487c478bd9Sstevel@tonic-gate */ 9497c478bd9Sstevel@tonic-gate if (vn_compare(vrootp, rootdir)) 9507c478bd9Sstevel@tonic-gate return (path); 9517c478bd9Sstevel@tonic-gate 9527c478bd9Sstevel@tonic-gate if (pn_get(path, UIO_SYSSPACE, &pn) != 0) 9537c478bd9Sstevel@tonic-gate return (NULL); 9547c478bd9Sstevel@tonic-gate 9557c478bd9Sstevel@tonic-gate vp = rootdir; 9567c478bd9Sstevel@tonic-gate VN_HOLD(vp); 9577c478bd9Sstevel@tonic-gate 9585fd6860bSMilan Cermak if (vn_ismntpt(vp) && traverse(&vp) != 0) { 9595fd6860bSMilan Cermak VN_RELE(vp); 9605fd6860bSMilan Cermak pn_free(&pn); 9615fd6860bSMilan Cermak return (NULL); 9625fd6860bSMilan Cermak } 9635fd6860bSMilan Cermak 9647c478bd9Sstevel@tonic-gate while (pn_pathleft(&pn)) { 9657c478bd9Sstevel@tonic-gate pn_skipslash(&pn); 9667c478bd9Sstevel@tonic-gate 9677c478bd9Sstevel@tonic-gate if (pn_getcomponent(&pn, component) != 0) 9687c478bd9Sstevel@tonic-gate break; 9697c478bd9Sstevel@tonic-gate 970da6c28aaSamw if (VOP_LOOKUP(vp, component, &cvp, &pn, 0, rootdir, cr, 971da6c28aaSamw NULL, NULL, NULL) != 0) 9727c478bd9Sstevel@tonic-gate break; 9737c478bd9Sstevel@tonic-gate VN_RELE(vp); 9747c478bd9Sstevel@tonic-gate vp = cvp; 9757c478bd9Sstevel@tonic-gate 9765fd6860bSMilan Cermak if (vn_ismntpt(vp) && traverse(&vp) != 0) 9775fd6860bSMilan Cermak break; 9785fd6860bSMilan Cermak 9797c478bd9Sstevel@tonic-gate if (vn_compare(vp, vrootp)) { 9807c478bd9Sstevel@tonic-gate ret = path + (pn.pn_path - pn.pn_buf); 9817c478bd9Sstevel@tonic-gate break; 9827c478bd9Sstevel@tonic-gate } 9837c478bd9Sstevel@tonic-gate } 9847c478bd9Sstevel@tonic-gate 9857c478bd9Sstevel@tonic-gate VN_RELE(vp); 9867c478bd9Sstevel@tonic-gate pn_free(&pn); 9877c478bd9Sstevel@tonic-gate 9887c478bd9Sstevel@tonic-gate return (ret); 9897c478bd9Sstevel@tonic-gate } 9907c478bd9Sstevel@tonic-gate 9917c478bd9Sstevel@tonic-gate /* 9927c478bd9Sstevel@tonic-gate * Given a directory, return the full, resolved path. This looks up "..", 9937c478bd9Sstevel@tonic-gate * searches for the given vnode in the parent, appends the component, etc. It 9942f5706a1SWilliam.Johnston * is used to implement vnodetopath() and getcwd() when the cached path fails. 9957c478bd9Sstevel@tonic-gate */ 9967c478bd9Sstevel@tonic-gate static int 9977b2df5ebSMilan Cermak dirtopath(vnode_t *vrootp, vnode_t *vp, char *buf, size_t buflen, int flags, 9987b2df5ebSMilan Cermak cred_t *cr) 9997c478bd9Sstevel@tonic-gate { 10007c478bd9Sstevel@tonic-gate pathname_t pn, rpn, emptypn; 10017c478bd9Sstevel@tonic-gate vnode_t *cmpvp, *pvp = NULL; 10027c478bd9Sstevel@tonic-gate vnode_t *startvp = vp; 10037b2df5ebSMilan Cermak int err = 0, vprivs; 10047c478bd9Sstevel@tonic-gate size_t complen; 10057c478bd9Sstevel@tonic-gate char *dbuf; 10067c478bd9Sstevel@tonic-gate dirent64_t *dp; 10077c478bd9Sstevel@tonic-gate char *bufloc; 10087c478bd9Sstevel@tonic-gate size_t dlen = DIRENT64_RECLEN(MAXPATHLEN); 10097c478bd9Sstevel@tonic-gate refstr_t *mntpt; 10107c478bd9Sstevel@tonic-gate 10117c478bd9Sstevel@tonic-gate /* Operation only allowed on directories */ 10127c478bd9Sstevel@tonic-gate ASSERT(vp->v_type == VDIR); 10137c478bd9Sstevel@tonic-gate 10147c478bd9Sstevel@tonic-gate /* We must have at least enough space for "/" */ 10157c478bd9Sstevel@tonic-gate if (buflen < 2) 10167c478bd9Sstevel@tonic-gate return (ENAMETOOLONG); 10177c478bd9Sstevel@tonic-gate 10187c478bd9Sstevel@tonic-gate /* Start at end of string with terminating null */ 10197c478bd9Sstevel@tonic-gate bufloc = &buf[buflen - 1]; 10207c478bd9Sstevel@tonic-gate *bufloc = '\0'; 10217c478bd9Sstevel@tonic-gate 10227c478bd9Sstevel@tonic-gate pn_alloc(&pn); 10237c478bd9Sstevel@tonic-gate pn_alloc(&rpn); 10247c478bd9Sstevel@tonic-gate dbuf = kmem_alloc(dlen, KM_SLEEP); 10257c478bd9Sstevel@tonic-gate bzero(&emptypn, sizeof (emptypn)); 10267c478bd9Sstevel@tonic-gate 10277c478bd9Sstevel@tonic-gate /* 10287c478bd9Sstevel@tonic-gate * Begin with an additional reference on vp. This will be decremented 10297c478bd9Sstevel@tonic-gate * during the loop. 10307c478bd9Sstevel@tonic-gate */ 10317c478bd9Sstevel@tonic-gate VN_HOLD(vp); 10327c478bd9Sstevel@tonic-gate 10337c478bd9Sstevel@tonic-gate for (;;) { 10347c478bd9Sstevel@tonic-gate /* 10357c478bd9Sstevel@tonic-gate * Return if we've reached the root. If the buffer is empty, 10367c478bd9Sstevel@tonic-gate * return '/'. We explicitly don't use vn_compare(), since it 10377c478bd9Sstevel@tonic-gate * compares the real vnodes. A lofs mount of '/' would produce 10387c478bd9Sstevel@tonic-gate * incorrect results otherwise. 10397c478bd9Sstevel@tonic-gate */ 10407c478bd9Sstevel@tonic-gate if (VN_CMP(vrootp, vp)) { 10417c478bd9Sstevel@tonic-gate if (*bufloc == '\0') 10427c478bd9Sstevel@tonic-gate *--bufloc = '/'; 10437c478bd9Sstevel@tonic-gate break; 10447c478bd9Sstevel@tonic-gate } 10457c478bd9Sstevel@tonic-gate 10467c478bd9Sstevel@tonic-gate /* 10477c478bd9Sstevel@tonic-gate * If we've reached the VFS root, something has gone wrong. We 10487c478bd9Sstevel@tonic-gate * should have reached the root in the above check. The only 10497c478bd9Sstevel@tonic-gate * explantation is that 'vp' is not contained withing the given 10507c478bd9Sstevel@tonic-gate * root, in which case we return EPERM. 10517c478bd9Sstevel@tonic-gate */ 10527c478bd9Sstevel@tonic-gate if (VN_CMP(rootdir, vp)) { 10537c478bd9Sstevel@tonic-gate err = EPERM; 10547c478bd9Sstevel@tonic-gate goto out; 10557c478bd9Sstevel@tonic-gate } 10567c478bd9Sstevel@tonic-gate 10577c478bd9Sstevel@tonic-gate /* 10587c478bd9Sstevel@tonic-gate * Shortcut: see if this vnode is a mountpoint. If so, 10597c478bd9Sstevel@tonic-gate * grab the path information from the vfs_t. 10607c478bd9Sstevel@tonic-gate */ 10617c478bd9Sstevel@tonic-gate if (vp->v_flag & VROOT) { 10627c478bd9Sstevel@tonic-gate 10637c478bd9Sstevel@tonic-gate mntpt = vfs_getmntpoint(vp->v_vfsp); 10647c478bd9Sstevel@tonic-gate if ((err = pn_set(&pn, (char *)refstr_value(mntpt))) 10657c478bd9Sstevel@tonic-gate == 0) { 10667c478bd9Sstevel@tonic-gate refstr_rele(mntpt); 10677c478bd9Sstevel@tonic-gate rpn.pn_path = rpn.pn_buf; 10687c478bd9Sstevel@tonic-gate 10697c478bd9Sstevel@tonic-gate /* 1070207983b5SMilan Cermak * Ensure the mountpoint still exists. 10717c478bd9Sstevel@tonic-gate */ 10727c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 10737c478bd9Sstevel@tonic-gate if (vrootp != rootdir) 10747c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 10757b2df5ebSMilan Cermak if (lookuppnvp(&pn, &rpn, flags, NULL, 10767c478bd9Sstevel@tonic-gate &cmpvp, vrootp, vrootp, cr) == 0) { 10777c478bd9Sstevel@tonic-gate 10787c478bd9Sstevel@tonic-gate if (VN_CMP(vp, cmpvp)) { 10797c478bd9Sstevel@tonic-gate VN_RELE(cmpvp); 10807c478bd9Sstevel@tonic-gate 10817c478bd9Sstevel@tonic-gate complen = strlen(rpn.pn_path); 10827c478bd9Sstevel@tonic-gate bufloc -= complen; 10837c478bd9Sstevel@tonic-gate if (bufloc < buf) { 10847c478bd9Sstevel@tonic-gate err = ERANGE; 10857c478bd9Sstevel@tonic-gate goto out; 10867c478bd9Sstevel@tonic-gate } 10877c478bd9Sstevel@tonic-gate bcopy(rpn.pn_path, bufloc, 10887c478bd9Sstevel@tonic-gate complen); 10897c478bd9Sstevel@tonic-gate break; 10907c478bd9Sstevel@tonic-gate } else { 10917c478bd9Sstevel@tonic-gate VN_RELE(cmpvp); 10927c478bd9Sstevel@tonic-gate } 10937c478bd9Sstevel@tonic-gate } 10947c478bd9Sstevel@tonic-gate } else { 10957c478bd9Sstevel@tonic-gate refstr_rele(mntpt); 10967c478bd9Sstevel@tonic-gate } 10977c478bd9Sstevel@tonic-gate } 10987c478bd9Sstevel@tonic-gate 1099207983b5SMilan Cermak /* 1100207983b5SMilan Cermak * Shortcut: see if this vnode has correct v_path. If so, 1101207983b5SMilan Cermak * we have the work done. 1102207983b5SMilan Cermak */ 1103207983b5SMilan Cermak mutex_enter(&vp->v_lock); 1104207983b5SMilan Cermak if (vp->v_path != NULL) { 1105207983b5SMilan Cermak 1106207983b5SMilan Cermak if ((err = pn_set(&pn, vp->v_path)) == 0) { 1107207983b5SMilan Cermak mutex_exit(&vp->v_lock); 1108207983b5SMilan Cermak rpn.pn_path = rpn.pn_buf; 1109207983b5SMilan Cermak 1110207983b5SMilan Cermak /* 1111207983b5SMilan Cermak * Ensure the v_path pointing to correct vnode 1112207983b5SMilan Cermak */ 1113207983b5SMilan Cermak VN_HOLD(vrootp); 1114207983b5SMilan Cermak if (vrootp != rootdir) 1115207983b5SMilan Cermak VN_HOLD(vrootp); 11167b2df5ebSMilan Cermak if (lookuppnvp(&pn, &rpn, flags, NULL, 1117207983b5SMilan Cermak &cmpvp, vrootp, vrootp, cr) == 0) { 1118207983b5SMilan Cermak 1119207983b5SMilan Cermak if (VN_CMP(vp, cmpvp)) { 1120207983b5SMilan Cermak VN_RELE(cmpvp); 1121207983b5SMilan Cermak 1122207983b5SMilan Cermak complen = strlen(rpn.pn_path); 1123207983b5SMilan Cermak bufloc -= complen; 1124207983b5SMilan Cermak if (bufloc < buf) { 1125207983b5SMilan Cermak err = ERANGE; 1126207983b5SMilan Cermak goto out; 1127207983b5SMilan Cermak } 1128207983b5SMilan Cermak bcopy(rpn.pn_path, bufloc, 1129207983b5SMilan Cermak complen); 1130207983b5SMilan Cermak break; 1131207983b5SMilan Cermak } else { 1132207983b5SMilan Cermak VN_RELE(cmpvp); 1133207983b5SMilan Cermak } 1134207983b5SMilan Cermak } 1135207983b5SMilan Cermak } else { 1136207983b5SMilan Cermak mutex_exit(&vp->v_lock); 1137207983b5SMilan Cermak } 1138207983b5SMilan Cermak } else { 1139207983b5SMilan Cermak mutex_exit(&vp->v_lock); 1140207983b5SMilan Cermak } 1141207983b5SMilan Cermak 11427c478bd9Sstevel@tonic-gate /* 11437c478bd9Sstevel@tonic-gate * Shortcuts failed, search for this vnode in its parent. If 11447c478bd9Sstevel@tonic-gate * this is a mountpoint, then get the vnode underneath. 11457c478bd9Sstevel@tonic-gate */ 11467c478bd9Sstevel@tonic-gate if (vp->v_flag & VROOT) 11477c478bd9Sstevel@tonic-gate vp = vn_under(vp); 1148da6c28aaSamw if ((err = VOP_LOOKUP(vp, "..", &pvp, &emptypn, 0, vrootp, cr, 1149da6c28aaSamw NULL, NULL, NULL)) != 0) 11507c478bd9Sstevel@tonic-gate goto out; 11517c478bd9Sstevel@tonic-gate 11527c478bd9Sstevel@tonic-gate /* 11537c478bd9Sstevel@tonic-gate * With extended attributes, it's possible for a directory to 11547c478bd9Sstevel@tonic-gate * have a parent that is a regular file. Check for that here. 11557c478bd9Sstevel@tonic-gate */ 11567c478bd9Sstevel@tonic-gate if (pvp->v_type != VDIR) { 11577c478bd9Sstevel@tonic-gate err = ENOTDIR; 11587c478bd9Sstevel@tonic-gate goto out; 11597c478bd9Sstevel@tonic-gate } 11607c478bd9Sstevel@tonic-gate 11617c478bd9Sstevel@tonic-gate /* 11627c478bd9Sstevel@tonic-gate * If this is true, something strange has happened. This is 11637c478bd9Sstevel@tonic-gate * only true if we are the root of a filesystem, which should 11647c478bd9Sstevel@tonic-gate * have been caught by the check above. 11657c478bd9Sstevel@tonic-gate */ 11667c478bd9Sstevel@tonic-gate if (VN_CMP(pvp, vp)) { 11677c478bd9Sstevel@tonic-gate err = ENOENT; 11687c478bd9Sstevel@tonic-gate goto out; 11697c478bd9Sstevel@tonic-gate } 11707c478bd9Sstevel@tonic-gate 11717b2df5ebSMilan Cermak /* 11727b2df5ebSMilan Cermak * Check if we have read and search privilege so, that 11737b2df5ebSMilan Cermak * we can lookup the path in the directory 11747b2df5ebSMilan Cermak */ 11757b2df5ebSMilan Cermak vprivs = (flags & LOOKUP_CHECKREAD) ? VREAD | VEXEC : VEXEC; 11767b2df5ebSMilan Cermak if ((err = VOP_ACCESS(pvp, vprivs, 0, cr, NULL)) != 0) { 11777b2df5ebSMilan Cermak goto out; 11787b2df5ebSMilan Cermak } 11797b2df5ebSMilan Cermak 1180207983b5SMilan Cermak /* 1181207983b5SMilan Cermak * Try to obtain the path component from dnlc cache 1182207983b5SMilan Cermak * before searching through the directory. 1183207983b5SMilan Cermak */ 1184207983b5SMilan Cermak if ((cmpvp = dnlc_reverse_lookup(vp, dbuf, dlen)) != NULL) { 1185207983b5SMilan Cermak /* 1186207983b5SMilan Cermak * If we got parent vnode as a result, 1187207983b5SMilan Cermak * then the answered path is correct. 1188207983b5SMilan Cermak */ 1189207983b5SMilan Cermak if (VN_CMP(cmpvp, pvp)) { 1190207983b5SMilan Cermak VN_RELE(cmpvp); 1191207983b5SMilan Cermak complen = strlen(dbuf); 1192207983b5SMilan Cermak bufloc -= complen; 1193207983b5SMilan Cermak if (bufloc <= buf) { 1194207983b5SMilan Cermak err = ENAMETOOLONG; 1195207983b5SMilan Cermak goto out; 1196207983b5SMilan Cermak } 1197207983b5SMilan Cermak bcopy(dbuf, bufloc, complen); 1198207983b5SMilan Cermak 1199207983b5SMilan Cermak /* Prepend a slash to the current path */ 1200207983b5SMilan Cermak *--bufloc = '/'; 1201207983b5SMilan Cermak 1202207983b5SMilan Cermak /* And continue with the next component */ 1203207983b5SMilan Cermak VN_RELE(vp); 1204207983b5SMilan Cermak vp = pvp; 1205207983b5SMilan Cermak pvp = NULL; 1206207983b5SMilan Cermak continue; 1207207983b5SMilan Cermak } else { 1208207983b5SMilan Cermak VN_RELE(cmpvp); 1209207983b5SMilan Cermak } 1210207983b5SMilan Cermak } 1211207983b5SMilan Cermak 12127c478bd9Sstevel@tonic-gate /* 12137c478bd9Sstevel@tonic-gate * Search the parent directory for the entry corresponding to 12147c478bd9Sstevel@tonic-gate * this vnode. 12157c478bd9Sstevel@tonic-gate */ 12167c478bd9Sstevel@tonic-gate if ((err = dirfindvp(vrootp, pvp, vp, cr, dbuf, dlen, &dp)) 12177c478bd9Sstevel@tonic-gate != 0) 12187c478bd9Sstevel@tonic-gate goto out; 12197c478bd9Sstevel@tonic-gate complen = strlen(dp->d_name); 12207c478bd9Sstevel@tonic-gate bufloc -= complen; 12217c478bd9Sstevel@tonic-gate if (bufloc <= buf) { 12227c478bd9Sstevel@tonic-gate err = ENAMETOOLONG; 12237c478bd9Sstevel@tonic-gate goto out; 12247c478bd9Sstevel@tonic-gate } 12257c478bd9Sstevel@tonic-gate bcopy(dp->d_name, bufloc, complen); 12267c478bd9Sstevel@tonic-gate 12277c478bd9Sstevel@tonic-gate /* Prepend a slash to the current path. */ 12287c478bd9Sstevel@tonic-gate *--bufloc = '/'; 12297c478bd9Sstevel@tonic-gate 12307c478bd9Sstevel@tonic-gate /* And continue with the next component */ 12317c478bd9Sstevel@tonic-gate VN_RELE(vp); 12327c478bd9Sstevel@tonic-gate vp = pvp; 12337c478bd9Sstevel@tonic-gate pvp = NULL; 12347c478bd9Sstevel@tonic-gate } 12357c478bd9Sstevel@tonic-gate 12367c478bd9Sstevel@tonic-gate /* 12377c478bd9Sstevel@tonic-gate * Place the path at the beginning of the buffer. 12387c478bd9Sstevel@tonic-gate */ 12397c478bd9Sstevel@tonic-gate if (bufloc != buf) 12407c478bd9Sstevel@tonic-gate ovbcopy(bufloc, buf, buflen - (bufloc - buf)); 12417c478bd9Sstevel@tonic-gate 12427c478bd9Sstevel@tonic-gate out: 12437c478bd9Sstevel@tonic-gate /* 12447c478bd9Sstevel@tonic-gate * If the error was ESTALE and the current directory to look in 12457c478bd9Sstevel@tonic-gate * was the root for this lookup, the root for a mounted file 12467c478bd9Sstevel@tonic-gate * system, or the starting directory for lookups, then 12477c478bd9Sstevel@tonic-gate * return ENOENT instead of ESTALE. In this case, no recovery 12487c478bd9Sstevel@tonic-gate * is possible by the higher level. If ESTALE was returned for 12497c478bd9Sstevel@tonic-gate * some intermediate directory along the path, then recovery 12507c478bd9Sstevel@tonic-gate * is potentially possible and retrying from the higher level 12517c478bd9Sstevel@tonic-gate * will either correct the situation by purging stale cache 12527c478bd9Sstevel@tonic-gate * entries or eventually get back to the point where no recovery 12537c478bd9Sstevel@tonic-gate * is possible. 12547c478bd9Sstevel@tonic-gate */ 12557c478bd9Sstevel@tonic-gate if (err == ESTALE && 12567c478bd9Sstevel@tonic-gate (VN_CMP(vp, vrootp) || (vp->v_flag & VROOT) || vp == startvp)) 12577c478bd9Sstevel@tonic-gate err = ENOENT; 12587c478bd9Sstevel@tonic-gate 12597c478bd9Sstevel@tonic-gate kmem_free(dbuf, dlen); 12607c478bd9Sstevel@tonic-gate VN_RELE(vp); 12617c478bd9Sstevel@tonic-gate if (pvp) 12627c478bd9Sstevel@tonic-gate VN_RELE(pvp); 12637c478bd9Sstevel@tonic-gate pn_free(&pn); 12647c478bd9Sstevel@tonic-gate pn_free(&rpn); 12657c478bd9Sstevel@tonic-gate 12667c478bd9Sstevel@tonic-gate return (err); 12677c478bd9Sstevel@tonic-gate } 12687c478bd9Sstevel@tonic-gate 12697c478bd9Sstevel@tonic-gate /* 1270207983b5SMilan Cermak * The additional flag, LOOKUP_CHECKREAD, is used to enforce artificial 12717c478bd9Sstevel@tonic-gate * constraints in order to be standards compliant. For example, if we have 12727c478bd9Sstevel@tonic-gate * the cached path of '/foo/bar', and '/foo' has permissions 100 (execute 12737c478bd9Sstevel@tonic-gate * only), then we can legitimately look up the path to the current working 12747c478bd9Sstevel@tonic-gate * directory without needing read permission. Existing standards tests, 12757c478bd9Sstevel@tonic-gate * however, assume that we are determining the path by repeatedly looking up 12767c478bd9Sstevel@tonic-gate * "..". We need to keep this behavior in order to maintain backwards 12777c478bd9Sstevel@tonic-gate * compatibility. 12787c478bd9Sstevel@tonic-gate */ 12797c478bd9Sstevel@tonic-gate static int 12807c478bd9Sstevel@tonic-gate vnodetopath_common(vnode_t *vrootp, vnode_t *vp, char *buf, size_t buflen, 12817c478bd9Sstevel@tonic-gate cred_t *cr, int flags) 12827c478bd9Sstevel@tonic-gate { 12837c478bd9Sstevel@tonic-gate pathname_t pn, rpn; 12847c478bd9Sstevel@tonic-gate int ret, len; 12857c478bd9Sstevel@tonic-gate vnode_t *compvp, *pvp, *realvp; 12867c478bd9Sstevel@tonic-gate proc_t *p = curproc; 12877c478bd9Sstevel@tonic-gate char path[MAXNAMELEN]; 12887c478bd9Sstevel@tonic-gate int doclose = 0; 12897c478bd9Sstevel@tonic-gate 12907c478bd9Sstevel@tonic-gate /* 12917c478bd9Sstevel@tonic-gate * If vrootp is NULL, get the root for curproc. Callers with any other 12927c478bd9Sstevel@tonic-gate * requirements should pass in a different vrootp. 12937c478bd9Sstevel@tonic-gate */ 12947c478bd9Sstevel@tonic-gate if (vrootp == NULL) { 12957c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 12967c478bd9Sstevel@tonic-gate if ((vrootp = PTOU(p)->u_rdir) == NULL) 12977c478bd9Sstevel@tonic-gate vrootp = rootdir; 12987c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 12997c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 13007c478bd9Sstevel@tonic-gate } else { 13017c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 13027c478bd9Sstevel@tonic-gate } 13037c478bd9Sstevel@tonic-gate 13047c478bd9Sstevel@tonic-gate /* 13057c478bd9Sstevel@tonic-gate * This is to get around an annoying artifact of the /proc filesystem, 13067c478bd9Sstevel@tonic-gate * which is the behavior of {cwd/root}. Trying to resolve this path 13077c478bd9Sstevel@tonic-gate * will result in /proc/pid/cwd instead of whatever the real working 13087c478bd9Sstevel@tonic-gate * directory is. We can't rely on VOP_REALVP(), since that will break 13097c478bd9Sstevel@tonic-gate * lofs. The only difference between procfs and lofs is that opening 13107c478bd9Sstevel@tonic-gate * the file will return the underling vnode in the case of procfs. 13117c478bd9Sstevel@tonic-gate */ 1312da6c28aaSamw if (vp->v_type == VDIR && VOP_REALVP(vp, &realvp, NULL) == 0 && 13137c478bd9Sstevel@tonic-gate realvp != vp) { 13147c478bd9Sstevel@tonic-gate VN_HOLD(vp); 1315da6c28aaSamw if (VOP_OPEN(&vp, FREAD, cr, NULL) == 0) 13167c478bd9Sstevel@tonic-gate doclose = 1; 13177c478bd9Sstevel@tonic-gate else 13187c478bd9Sstevel@tonic-gate VN_RELE(vp); 13197c478bd9Sstevel@tonic-gate } 13207c478bd9Sstevel@tonic-gate 13217c478bd9Sstevel@tonic-gate pn_alloc(&pn); 13227c478bd9Sstevel@tonic-gate 13237c478bd9Sstevel@tonic-gate /* 13247c478bd9Sstevel@tonic-gate * Check to see if we have a cached path in the vnode. 13257c478bd9Sstevel@tonic-gate */ 13267c478bd9Sstevel@tonic-gate mutex_enter(&vp->v_lock); 1327ca2c3138Seschrock if (vp->v_path != NULL) { 1328ca2c3138Seschrock (void) pn_set(&pn, vp->v_path); 13297c478bd9Sstevel@tonic-gate mutex_exit(&vp->v_lock); 13307c478bd9Sstevel@tonic-gate 13317c478bd9Sstevel@tonic-gate pn_alloc(&rpn); 13327c478bd9Sstevel@tonic-gate 13337c478bd9Sstevel@tonic-gate /* We should only cache absolute paths */ 13347c478bd9Sstevel@tonic-gate ASSERT(pn.pn_buf[0] == '/'); 13357c478bd9Sstevel@tonic-gate 13367c478bd9Sstevel@tonic-gate /* 13377c478bd9Sstevel@tonic-gate * If we are in a zone or a chroot environment, then we have to 13387c478bd9Sstevel@tonic-gate * take additional steps, since the path to the root might not 13397c478bd9Sstevel@tonic-gate * be readable with the current credentials, even though the 13407c478bd9Sstevel@tonic-gate * process can legitmately access the file. In this case, we 13417c478bd9Sstevel@tonic-gate * do the following: 13427c478bd9Sstevel@tonic-gate * 13437c478bd9Sstevel@tonic-gate * lookuppnvp() with all privileges to get the resolved path. 13447c478bd9Sstevel@tonic-gate * call localpath() to get the local portion of the path, and 13457c478bd9Sstevel@tonic-gate * continue as normal. 13467c478bd9Sstevel@tonic-gate * 13477c478bd9Sstevel@tonic-gate * If the the conversion to a local path fails, then we continue 13487c478bd9Sstevel@tonic-gate * as normal. This is a heuristic to make process object file 13497c478bd9Sstevel@tonic-gate * paths available from within a zone. Because lofs doesn't 13507c478bd9Sstevel@tonic-gate * support page operations, the vnode stored in the seg_t is 13517c478bd9Sstevel@tonic-gate * actually the underlying real vnode, not the lofs node itself. 13527c478bd9Sstevel@tonic-gate * Most of the time, the lofs path is the same as the underlying 13537c478bd9Sstevel@tonic-gate * vnode (for example, /usr/lib/libc.so.1). 13547c478bd9Sstevel@tonic-gate */ 13557c478bd9Sstevel@tonic-gate if (vrootp != rootdir) { 13567c478bd9Sstevel@tonic-gate char *local = NULL; 13577c478bd9Sstevel@tonic-gate VN_HOLD(rootdir); 13587c478bd9Sstevel@tonic-gate if (lookuppnvp(&pn, &rpn, FOLLOW, 13597c478bd9Sstevel@tonic-gate NULL, &compvp, rootdir, rootdir, kcred) == 0) { 13607c478bd9Sstevel@tonic-gate local = localpath(rpn.pn_path, vrootp, 13617c478bd9Sstevel@tonic-gate kcred); 13627c478bd9Sstevel@tonic-gate VN_RELE(compvp); 13637c478bd9Sstevel@tonic-gate } 13647c478bd9Sstevel@tonic-gate 13657c478bd9Sstevel@tonic-gate /* 1366207983b5SMilan Cermak * The original pn was changed through lookuppnvp(). 1367207983b5SMilan Cermak * Set it to local for next validation attempt. 13687c478bd9Sstevel@tonic-gate */ 13697c478bd9Sstevel@tonic-gate if (local) { 13707c478bd9Sstevel@tonic-gate (void) pn_set(&pn, local); 13717c478bd9Sstevel@tonic-gate } else { 1372207983b5SMilan Cermak goto notcached; 13737c478bd9Sstevel@tonic-gate } 13747c478bd9Sstevel@tonic-gate } 13757c478bd9Sstevel@tonic-gate 13767c478bd9Sstevel@tonic-gate /* 13777c478bd9Sstevel@tonic-gate * We should have a local path at this point, so start the 13787c478bd9Sstevel@tonic-gate * search from the root of the current process. 13797c478bd9Sstevel@tonic-gate */ 13807c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 13817c478bd9Sstevel@tonic-gate if (vrootp != rootdir) 13827c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 13837c478bd9Sstevel@tonic-gate ret = lookuppnvp(&pn, &rpn, FOLLOW | flags, NULL, 13847c478bd9Sstevel@tonic-gate &compvp, vrootp, vrootp, cr); 13857c478bd9Sstevel@tonic-gate if (ret == 0) { 13867c478bd9Sstevel@tonic-gate /* 13877c478bd9Sstevel@tonic-gate * Check to see if the returned vnode is the same as 13887c478bd9Sstevel@tonic-gate * the one we expect. If not, give up. 13897c478bd9Sstevel@tonic-gate */ 13907c478bd9Sstevel@tonic-gate if (!vn_compare(vp, compvp) && 13917c478bd9Sstevel@tonic-gate !vnode_match(vp, compvp, cr)) { 13927c478bd9Sstevel@tonic-gate VN_RELE(compvp); 13937c478bd9Sstevel@tonic-gate goto notcached; 13947c478bd9Sstevel@tonic-gate } 13957c478bd9Sstevel@tonic-gate 13967c478bd9Sstevel@tonic-gate VN_RELE(compvp); 13977c478bd9Sstevel@tonic-gate 13987c478bd9Sstevel@tonic-gate /* 13997c478bd9Sstevel@tonic-gate * Return the result. 14007c478bd9Sstevel@tonic-gate */ 14017c478bd9Sstevel@tonic-gate if (buflen <= rpn.pn_pathlen) 14027c478bd9Sstevel@tonic-gate goto notcached; 14037c478bd9Sstevel@tonic-gate 14047c478bd9Sstevel@tonic-gate bcopy(rpn.pn_path, buf, rpn.pn_pathlen + 1); 14057c478bd9Sstevel@tonic-gate pn_free(&pn); 14067c478bd9Sstevel@tonic-gate pn_free(&rpn); 14077c478bd9Sstevel@tonic-gate VN_RELE(vrootp); 14087c478bd9Sstevel@tonic-gate if (doclose) { 1409da6c28aaSamw (void) VOP_CLOSE(vp, FREAD, 1, 0, cr, NULL); 14107c478bd9Sstevel@tonic-gate VN_RELE(vp); 14117c478bd9Sstevel@tonic-gate } 14127c478bd9Sstevel@tonic-gate return (0); 14137c478bd9Sstevel@tonic-gate } 14147c478bd9Sstevel@tonic-gate 14157c478bd9Sstevel@tonic-gate notcached: 14167c478bd9Sstevel@tonic-gate pn_free(&rpn); 14177c478bd9Sstevel@tonic-gate } else { 14187c478bd9Sstevel@tonic-gate mutex_exit(&vp->v_lock); 14197c478bd9Sstevel@tonic-gate } 14207c478bd9Sstevel@tonic-gate 14217c478bd9Sstevel@tonic-gate pn_free(&pn); 14227c478bd9Sstevel@tonic-gate 14237c478bd9Sstevel@tonic-gate if (vp->v_type != VDIR) { 14247c478bd9Sstevel@tonic-gate /* 14257c478bd9Sstevel@tonic-gate * If we don't have a directory, try to find it in the dnlc via 14267c478bd9Sstevel@tonic-gate * reverse lookup. Once this is found, we can use the regular 14277c478bd9Sstevel@tonic-gate * directory search to find the full path. 14287c478bd9Sstevel@tonic-gate */ 14297c478bd9Sstevel@tonic-gate if ((pvp = dnlc_reverse_lookup(vp, path, MAXNAMELEN)) != NULL) { 14307b2df5ebSMilan Cermak /* 14317b2df5ebSMilan Cermak * Check if we have read privilege so, that 14327b2df5ebSMilan Cermak * we can lookup the path in the directory 14337b2df5ebSMilan Cermak */ 14347b2df5ebSMilan Cermak ret = 0; 14357b2df5ebSMilan Cermak if ((flags & LOOKUP_CHECKREAD)) { 14367b2df5ebSMilan Cermak ret = VOP_ACCESS(pvp, VREAD, 0, cr, NULL); 14377b2df5ebSMilan Cermak } 14387b2df5ebSMilan Cermak if (ret == 0) { 14397b2df5ebSMilan Cermak ret = dirtopath(vrootp, pvp, buf, buflen, 14407b2df5ebSMilan Cermak flags, cr); 14417b2df5ebSMilan Cermak } 14427c478bd9Sstevel@tonic-gate if (ret == 0) { 14437c478bd9Sstevel@tonic-gate len = strlen(buf); 14447c478bd9Sstevel@tonic-gate if (len + strlen(path) + 1 >= buflen) { 14457c478bd9Sstevel@tonic-gate ret = ENAMETOOLONG; 14467c478bd9Sstevel@tonic-gate } else { 14477c478bd9Sstevel@tonic-gate if (buf[len - 1] != '/') 14487c478bd9Sstevel@tonic-gate buf[len++] = '/'; 14497c478bd9Sstevel@tonic-gate bcopy(path, buf + len, 14507c478bd9Sstevel@tonic-gate strlen(path) + 1); 14517c478bd9Sstevel@tonic-gate } 14527c478bd9Sstevel@tonic-gate } 14537c478bd9Sstevel@tonic-gate 14547c478bd9Sstevel@tonic-gate VN_RELE(pvp); 14557c478bd9Sstevel@tonic-gate } else 14567c478bd9Sstevel@tonic-gate ret = ENOENT; 14577c478bd9Sstevel@tonic-gate } else 14587b2df5ebSMilan Cermak ret = dirtopath(vrootp, vp, buf, buflen, flags, cr); 14597c478bd9Sstevel@tonic-gate 14607c478bd9Sstevel@tonic-gate VN_RELE(vrootp); 14617c478bd9Sstevel@tonic-gate if (doclose) { 1462da6c28aaSamw (void) VOP_CLOSE(vp, FREAD, 1, 0, cr, NULL); 14637c478bd9Sstevel@tonic-gate VN_RELE(vp); 14647c478bd9Sstevel@tonic-gate } 14657c478bd9Sstevel@tonic-gate 14667c478bd9Sstevel@tonic-gate return (ret); 14677c478bd9Sstevel@tonic-gate } 14687c478bd9Sstevel@tonic-gate 14697c478bd9Sstevel@tonic-gate int 14707c478bd9Sstevel@tonic-gate vnodetopath(vnode_t *vrootp, vnode_t *vp, char *buf, size_t buflen, cred_t *cr) 14717c478bd9Sstevel@tonic-gate { 14727c478bd9Sstevel@tonic-gate return (vnodetopath_common(vrootp, vp, buf, buflen, cr, 0)); 14737c478bd9Sstevel@tonic-gate } 14747c478bd9Sstevel@tonic-gate 14757c478bd9Sstevel@tonic-gate int 14767c478bd9Sstevel@tonic-gate dogetcwd(char *buf, size_t buflen) 14777c478bd9Sstevel@tonic-gate { 14787c478bd9Sstevel@tonic-gate int ret; 14797c478bd9Sstevel@tonic-gate vnode_t *vp; 14807c478bd9Sstevel@tonic-gate vnode_t *compvp; 14817c478bd9Sstevel@tonic-gate refstr_t *cwd, *oldcwd; 14827c478bd9Sstevel@tonic-gate const char *value; 14837c478bd9Sstevel@tonic-gate pathname_t rpnp, pnp; 14847c478bd9Sstevel@tonic-gate proc_t *p = curproc; 14857c478bd9Sstevel@tonic-gate 14867c478bd9Sstevel@tonic-gate /* 14877c478bd9Sstevel@tonic-gate * Check to see if there is a cached version of the cwd. If so, lookup 14887c478bd9Sstevel@tonic-gate * the cached value and make sure it is the same vnode. 14897c478bd9Sstevel@tonic-gate */ 14907c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 14917c478bd9Sstevel@tonic-gate if ((cwd = PTOU(p)->u_cwd) != NULL) 14927c478bd9Sstevel@tonic-gate refstr_hold(cwd); 14937c478bd9Sstevel@tonic-gate vp = PTOU(p)->u_cdir; 14947c478bd9Sstevel@tonic-gate VN_HOLD(vp); 14957c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 14967c478bd9Sstevel@tonic-gate 14977c478bd9Sstevel@tonic-gate /* 14987c478bd9Sstevel@tonic-gate * Make sure we have permission to access the current directory. 14997c478bd9Sstevel@tonic-gate */ 1500da6c28aaSamw if ((ret = VOP_ACCESS(vp, VEXEC, 0, CRED(), NULL)) != 0) { 15017c478bd9Sstevel@tonic-gate if (cwd != NULL) 15027c478bd9Sstevel@tonic-gate refstr_rele(cwd); 15037c478bd9Sstevel@tonic-gate VN_RELE(vp); 15047c478bd9Sstevel@tonic-gate return (ret); 15057c478bd9Sstevel@tonic-gate } 15067c478bd9Sstevel@tonic-gate 15077c478bd9Sstevel@tonic-gate if (cwd) { 15087c478bd9Sstevel@tonic-gate value = refstr_value(cwd); 15097c478bd9Sstevel@tonic-gate if ((ret = pn_get((char *)value, UIO_SYSSPACE, &pnp)) != 0) { 15107c478bd9Sstevel@tonic-gate refstr_rele(cwd); 15117c478bd9Sstevel@tonic-gate VN_RELE(vp); 15127c478bd9Sstevel@tonic-gate return (ret); 15137c478bd9Sstevel@tonic-gate } 15147c478bd9Sstevel@tonic-gate 15157c478bd9Sstevel@tonic-gate pn_alloc(&rpnp); 15167c478bd9Sstevel@tonic-gate 15177c478bd9Sstevel@tonic-gate if (lookuppn(&pnp, &rpnp, NO_FOLLOW, NULL, &compvp) == 0) { 15187c478bd9Sstevel@tonic-gate 15197c478bd9Sstevel@tonic-gate if (VN_CMP(vp, compvp) && 15207c478bd9Sstevel@tonic-gate strcmp(value, rpnp.pn_path) == 0) { 15217c478bd9Sstevel@tonic-gate VN_RELE(compvp); 15227c478bd9Sstevel@tonic-gate VN_RELE(vp); 15237c478bd9Sstevel@tonic-gate pn_free(&pnp); 15247c478bd9Sstevel@tonic-gate pn_free(&rpnp); 15257c478bd9Sstevel@tonic-gate if (strlen(value) + 1 > buflen) { 15267c478bd9Sstevel@tonic-gate refstr_rele(cwd); 15277c478bd9Sstevel@tonic-gate return (ENAMETOOLONG); 15287c478bd9Sstevel@tonic-gate } 15297c478bd9Sstevel@tonic-gate bcopy(value, buf, strlen(value) + 1); 15307c478bd9Sstevel@tonic-gate refstr_rele(cwd); 15317c478bd9Sstevel@tonic-gate return (0); 15327c478bd9Sstevel@tonic-gate } 15337c478bd9Sstevel@tonic-gate 15347c478bd9Sstevel@tonic-gate VN_RELE(compvp); 15357c478bd9Sstevel@tonic-gate } 15367c478bd9Sstevel@tonic-gate 15377c478bd9Sstevel@tonic-gate pn_free(&rpnp); 15387c478bd9Sstevel@tonic-gate pn_free(&pnp); 15397c478bd9Sstevel@tonic-gate 15407c478bd9Sstevel@tonic-gate refstr_rele(cwd); 15417c478bd9Sstevel@tonic-gate } 15427c478bd9Sstevel@tonic-gate 15437c478bd9Sstevel@tonic-gate ret = vnodetopath_common(NULL, vp, buf, buflen, CRED(), 15447c478bd9Sstevel@tonic-gate LOOKUP_CHECKREAD); 15457c478bd9Sstevel@tonic-gate 15467c478bd9Sstevel@tonic-gate VN_RELE(vp); 15477c478bd9Sstevel@tonic-gate 15487c478bd9Sstevel@tonic-gate /* 15497c478bd9Sstevel@tonic-gate * Store the new cwd and replace the existing cached copy. 15507c478bd9Sstevel@tonic-gate */ 15517c478bd9Sstevel@tonic-gate if (ret == 0) 15527c478bd9Sstevel@tonic-gate cwd = refstr_alloc(buf); 15537c478bd9Sstevel@tonic-gate else 15547c478bd9Sstevel@tonic-gate cwd = NULL; 15557c478bd9Sstevel@tonic-gate 15567c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 15577c478bd9Sstevel@tonic-gate oldcwd = PTOU(p)->u_cwd; 15587c478bd9Sstevel@tonic-gate PTOU(p)->u_cwd = cwd; 15597c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 15607c478bd9Sstevel@tonic-gate 15617c478bd9Sstevel@tonic-gate if (oldcwd) 15627c478bd9Sstevel@tonic-gate refstr_rele(oldcwd); 15637c478bd9Sstevel@tonic-gate 15647c478bd9Sstevel@tonic-gate return (ret); 15657c478bd9Sstevel@tonic-gate } 1566