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 /* 22*7a142be9SCasper H.S. Dik * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 237c478bd9Sstevel@tonic-gate * Use is subject to license terms. 247c478bd9Sstevel@tonic-gate */ 257c478bd9Sstevel@tonic-gate 267c478bd9Sstevel@tonic-gate /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 277c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 287c478bd9Sstevel@tonic-gate 297c478bd9Sstevel@tonic-gate /* 307c478bd9Sstevel@tonic-gate * University Copyright- Copyright (c) 1982, 1986, 1988 317c478bd9Sstevel@tonic-gate * The Regents of the University of California 327c478bd9Sstevel@tonic-gate * All Rights Reserved 337c478bd9Sstevel@tonic-gate * 347c478bd9Sstevel@tonic-gate * University Acknowledgment- Portions of this document are derived from 357c478bd9Sstevel@tonic-gate * software developed by the University of California, Berkeley, and its 367c478bd9Sstevel@tonic-gate * contributors. 377c478bd9Sstevel@tonic-gate */ 387c478bd9Sstevel@tonic-gate 397c478bd9Sstevel@tonic-gate #include <sys/types.h> 407c478bd9Sstevel@tonic-gate #include <sys/param.h> 417c478bd9Sstevel@tonic-gate #include <sys/systm.h> 427c478bd9Sstevel@tonic-gate #include <sys/cpuvar.h> 437c478bd9Sstevel@tonic-gate #include <sys/errno.h> 447c478bd9Sstevel@tonic-gate #include <sys/cred.h> 457c478bd9Sstevel@tonic-gate #include <sys/user.h> 467c478bd9Sstevel@tonic-gate #include <sys/uio.h> 477c478bd9Sstevel@tonic-gate #include <sys/vfs.h> 487c478bd9Sstevel@tonic-gate #include <sys/vnode.h> 497c478bd9Sstevel@tonic-gate #include <sys/pathname.h> 507c478bd9Sstevel@tonic-gate #include <sys/proc.h> 517c478bd9Sstevel@tonic-gate #include <sys/vtrace.h> 527c478bd9Sstevel@tonic-gate #include <sys/sysmacros.h> 537c478bd9Sstevel@tonic-gate #include <sys/debug.h> 547c478bd9Sstevel@tonic-gate #include <sys/dirent.h> 557c478bd9Sstevel@tonic-gate #include <c2/audit.h> 567c478bd9Sstevel@tonic-gate #include <sys/zone.h> 577c478bd9Sstevel@tonic-gate #include <sys/dnlc.h> 587c478bd9Sstevel@tonic-gate #include <sys/fs/snode.h> 597c478bd9Sstevel@tonic-gate 607c478bd9Sstevel@tonic-gate /* Controls whether paths are stored with vnodes. */ 617c478bd9Sstevel@tonic-gate int vfs_vnode_path = 1; 627c478bd9Sstevel@tonic-gate 637c478bd9Sstevel@tonic-gate int 647c478bd9Sstevel@tonic-gate lookupname( 657c478bd9Sstevel@tonic-gate char *fnamep, 667c478bd9Sstevel@tonic-gate enum uio_seg seg, 677c478bd9Sstevel@tonic-gate enum symfollow followlink, 687c478bd9Sstevel@tonic-gate vnode_t **dirvpp, 697c478bd9Sstevel@tonic-gate vnode_t **compvpp) 707c478bd9Sstevel@tonic-gate { 71*7a142be9SCasper H.S. Dik return (lookupnameatcred(fnamep, seg, followlink, dirvpp, compvpp, NULL, 72*7a142be9SCasper H.S. Dik CRED())); 737c478bd9Sstevel@tonic-gate } 747c478bd9Sstevel@tonic-gate 757c478bd9Sstevel@tonic-gate /* 767c478bd9Sstevel@tonic-gate * Lookup the user file name, 777c478bd9Sstevel@tonic-gate * Handle allocation and freeing of pathname buffer, return error. 787c478bd9Sstevel@tonic-gate */ 797c478bd9Sstevel@tonic-gate int 80*7a142be9SCasper H.S. Dik lookupnameatcred( 817c478bd9Sstevel@tonic-gate char *fnamep, /* user pathname */ 827c478bd9Sstevel@tonic-gate enum uio_seg seg, /* addr space that name is in */ 837c478bd9Sstevel@tonic-gate enum symfollow followlink, /* follow sym links */ 847c478bd9Sstevel@tonic-gate vnode_t **dirvpp, /* ret for ptr to parent dir vnode */ 857c478bd9Sstevel@tonic-gate vnode_t **compvpp, /* ret for ptr to component vnode */ 86*7a142be9SCasper H.S. Dik vnode_t *startvp, /* start path search from vp */ 87*7a142be9SCasper H.S. Dik cred_t *cr) /* credential */ 887c478bd9Sstevel@tonic-gate { 897c478bd9Sstevel@tonic-gate char namebuf[TYPICALMAXPATHLEN]; 907c478bd9Sstevel@tonic-gate struct pathname lookpn; 917c478bd9Sstevel@tonic-gate int error; 927c478bd9Sstevel@tonic-gate 937c478bd9Sstevel@tonic-gate error = pn_get_buf(fnamep, seg, &lookpn, namebuf, sizeof (namebuf)); 947c478bd9Sstevel@tonic-gate if (error == 0) { 957c478bd9Sstevel@tonic-gate if (audit_active) 967c478bd9Sstevel@tonic-gate audit_lookupname(); 97*7a142be9SCasper H.S. Dik error = lookuppnatcred(&lookpn, NULL, followlink, 98*7a142be9SCasper H.S. Dik dirvpp, compvpp, startvp, cr); 997c478bd9Sstevel@tonic-gate } 1007c478bd9Sstevel@tonic-gate if (error == ENAMETOOLONG) { 1017c478bd9Sstevel@tonic-gate /* 1027c478bd9Sstevel@tonic-gate * This thread used a pathname > TYPICALMAXPATHLEN bytes long. 1037c478bd9Sstevel@tonic-gate */ 1047c478bd9Sstevel@tonic-gate if (error = pn_get(fnamep, seg, &lookpn)) 1057c478bd9Sstevel@tonic-gate return (error); 106*7a142be9SCasper H.S. Dik error = lookuppnatcred(&lookpn, NULL, followlink, 107*7a142be9SCasper H.S. Dik dirvpp, compvpp, startvp, cr); 1087c478bd9Sstevel@tonic-gate pn_free(&lookpn); 1097c478bd9Sstevel@tonic-gate } 1107c478bd9Sstevel@tonic-gate 1117c478bd9Sstevel@tonic-gate return (error); 1127c478bd9Sstevel@tonic-gate } 1137c478bd9Sstevel@tonic-gate 114*7a142be9SCasper H.S. Dik int 115*7a142be9SCasper H.S. Dik lookupnameat(char *fnamep, enum uio_seg seg, enum symfollow followlink, 116*7a142be9SCasper H.S. Dik vnode_t **dirvpp, vnode_t **compvpp, vnode_t *startvp) 117*7a142be9SCasper H.S. Dik { 118*7a142be9SCasper H.S. Dik return (lookupnameatcred(fnamep, seg, followlink, dirvpp, compvpp, 119*7a142be9SCasper H.S. Dik startvp, CRED())); 120*7a142be9SCasper H.S. Dik } 121*7a142be9SCasper H.S. Dik 1227c478bd9Sstevel@tonic-gate int 1237c478bd9Sstevel@tonic-gate lookuppn( 1247c478bd9Sstevel@tonic-gate struct pathname *pnp, 1257c478bd9Sstevel@tonic-gate struct pathname *rpnp, 1267c478bd9Sstevel@tonic-gate enum symfollow followlink, 1277c478bd9Sstevel@tonic-gate vnode_t **dirvpp, 1287c478bd9Sstevel@tonic-gate vnode_t **compvpp) 1297c478bd9Sstevel@tonic-gate { 130*7a142be9SCasper H.S. Dik return (lookuppnatcred(pnp, rpnp, followlink, dirvpp, compvpp, NULL, 131*7a142be9SCasper H.S. Dik CRED())); 1327c478bd9Sstevel@tonic-gate } 1337c478bd9Sstevel@tonic-gate 134*7a142be9SCasper H.S. Dik /* 135*7a142be9SCasper H.S. Dik * Lookup the user file name from a given vp, using a specific credential. 136*7a142be9SCasper H.S. Dik */ 1377c478bd9Sstevel@tonic-gate int 138*7a142be9SCasper H.S. Dik lookuppnatcred( 1397c478bd9Sstevel@tonic-gate struct pathname *pnp, /* pathname to lookup */ 1407c478bd9Sstevel@tonic-gate struct pathname *rpnp, /* if non-NULL, return resolved path */ 1417c478bd9Sstevel@tonic-gate enum symfollow followlink, /* (don't) follow sym links */ 1427c478bd9Sstevel@tonic-gate vnode_t **dirvpp, /* ptr for parent vnode */ 1437c478bd9Sstevel@tonic-gate vnode_t **compvpp, /* ptr for entry vnode */ 144*7a142be9SCasper H.S. Dik vnode_t *startvp, /* start search from this vp */ 145*7a142be9SCasper H.S. Dik cred_t *cr) /* user credential */ 1467c478bd9Sstevel@tonic-gate { 1477c478bd9Sstevel@tonic-gate vnode_t *vp; /* current directory vp */ 1487c478bd9Sstevel@tonic-gate vnode_t *rootvp; 1497c478bd9Sstevel@tonic-gate proc_t *p = curproc; 1507c478bd9Sstevel@tonic-gate 1517c478bd9Sstevel@tonic-gate if (pnp->pn_pathlen == 0) 1527c478bd9Sstevel@tonic-gate return (ENOENT); 1537c478bd9Sstevel@tonic-gate 1547c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); /* for u_rdir and u_cdir */ 1557c478bd9Sstevel@tonic-gate if ((rootvp = PTOU(p)->u_rdir) == NULL) 1567c478bd9Sstevel@tonic-gate rootvp = rootdir; 1577c478bd9Sstevel@tonic-gate else if (rootvp != rootdir) /* no need to VN_HOLD rootdir */ 1587c478bd9Sstevel@tonic-gate VN_HOLD(rootvp); 1597c478bd9Sstevel@tonic-gate 1607c478bd9Sstevel@tonic-gate if (pnp->pn_path[0] == '/') { 1617c478bd9Sstevel@tonic-gate vp = rootvp; 1627c478bd9Sstevel@tonic-gate } else { 1637c478bd9Sstevel@tonic-gate vp = (startvp == NULL) ? PTOU(p)->u_cdir : startvp; 1647c478bd9Sstevel@tonic-gate } 1657c478bd9Sstevel@tonic-gate VN_HOLD(vp); 1667c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 1677c478bd9Sstevel@tonic-gate 1687c478bd9Sstevel@tonic-gate /* 1697c478bd9Sstevel@tonic-gate * Skip over leading slashes 1707c478bd9Sstevel@tonic-gate */ 1717c478bd9Sstevel@tonic-gate if (pnp->pn_path[0] == '/') { 1727c478bd9Sstevel@tonic-gate do { 1737c478bd9Sstevel@tonic-gate pnp->pn_path++; 1747c478bd9Sstevel@tonic-gate pnp->pn_pathlen--; 1757c478bd9Sstevel@tonic-gate } while (pnp->pn_path[0] == '/'); 1767c478bd9Sstevel@tonic-gate } 1777c478bd9Sstevel@tonic-gate 1787c478bd9Sstevel@tonic-gate return (lookuppnvp(pnp, rpnp, followlink, dirvpp, 179*7a142be9SCasper H.S. Dik compvpp, rootvp, vp, cr)); 180*7a142be9SCasper H.S. Dik } 181*7a142be9SCasper H.S. Dik 182*7a142be9SCasper H.S. Dik int 183*7a142be9SCasper H.S. Dik lookuppnat(struct pathname *pnp, struct pathname *rpnp, 184*7a142be9SCasper H.S. Dik enum symfollow followlink, vnode_t **dirvpp, vnode_t **compvpp, 185*7a142be9SCasper H.S. Dik vnode_t *startvp) 186*7a142be9SCasper H.S. Dik { 187*7a142be9SCasper H.S. Dik return (lookuppnatcred(pnp, rpnp, followlink, dirvpp, compvpp, startvp, 188*7a142be9SCasper H.S. Dik CRED())); 1897c478bd9Sstevel@tonic-gate } 1907c478bd9Sstevel@tonic-gate 1917c478bd9Sstevel@tonic-gate /* Private flag to do our getcwd() dirty work */ 1927c478bd9Sstevel@tonic-gate #define LOOKUP_CHECKREAD 0x10 1937c478bd9Sstevel@tonic-gate #define LOOKUP_MASK (~LOOKUP_CHECKREAD) 1947c478bd9Sstevel@tonic-gate 1957c478bd9Sstevel@tonic-gate /* 1967c478bd9Sstevel@tonic-gate * Starting at current directory, translate pathname pnp to end. 1977c478bd9Sstevel@tonic-gate * Leave pathname of final component in pnp, return the vnode 1987c478bd9Sstevel@tonic-gate * for the final component in *compvpp, and return the vnode 1997c478bd9Sstevel@tonic-gate * for the parent of the final component in dirvpp. 2007c478bd9Sstevel@tonic-gate * 2017c478bd9Sstevel@tonic-gate * This is the central routine in pathname translation and handles 2027c478bd9Sstevel@tonic-gate * multiple components in pathnames, separating them at /'s. It also 2037c478bd9Sstevel@tonic-gate * implements mounted file systems and processes symbolic links. 2047c478bd9Sstevel@tonic-gate * 2057c478bd9Sstevel@tonic-gate * vp is the vnode where the directory search should start. 2067c478bd9Sstevel@tonic-gate * 2077c478bd9Sstevel@tonic-gate * Reference counts: vp must be held prior to calling this function. rootvp 2087c478bd9Sstevel@tonic-gate * should only be held if rootvp != rootdir. 2097c478bd9Sstevel@tonic-gate */ 2107c478bd9Sstevel@tonic-gate int 2117c478bd9Sstevel@tonic-gate lookuppnvp( 2127c478bd9Sstevel@tonic-gate struct pathname *pnp, /* pathname to lookup */ 2137c478bd9Sstevel@tonic-gate struct pathname *rpnp, /* if non-NULL, return resolved path */ 2147c478bd9Sstevel@tonic-gate int flags, /* follow symlinks */ 2157c478bd9Sstevel@tonic-gate vnode_t **dirvpp, /* ptr for parent vnode */ 2167c478bd9Sstevel@tonic-gate vnode_t **compvpp, /* ptr for entry vnode */ 2177c478bd9Sstevel@tonic-gate vnode_t *rootvp, /* rootvp */ 2187c478bd9Sstevel@tonic-gate vnode_t *vp, /* directory to start search at */ 2197c478bd9Sstevel@tonic-gate cred_t *cr) /* user's credential */ 2207c478bd9Sstevel@tonic-gate { 2217c478bd9Sstevel@tonic-gate vnode_t *cvp; /* current component vp */ 2227c478bd9Sstevel@tonic-gate vnode_t *tvp; /* addressable temp ptr */ 2237c478bd9Sstevel@tonic-gate char component[MAXNAMELEN]; /* buffer for component (incl null) */ 2247c478bd9Sstevel@tonic-gate int error; 2257c478bd9Sstevel@tonic-gate int nlink; 2267c478bd9Sstevel@tonic-gate int lookup_flags; 227da6c28aaSamw struct pathname presrvd; /* case preserved name */ 228da6c28aaSamw struct pathname *pp = NULL; 2297c478bd9Sstevel@tonic-gate vnode_t *startvp; 2307c478bd9Sstevel@tonic-gate vnode_t *zonevp = curproc->p_zone->zone_rootvp; /* zone root */ 2317c478bd9Sstevel@tonic-gate int must_be_directory = 0; 2322e538c1cSvv boolean_t retry_with_kcred = B_FALSE; 2337c478bd9Sstevel@tonic-gate 2347c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(CPU, sys, namei, 1); 2357c478bd9Sstevel@tonic-gate nlink = 0; 2367c478bd9Sstevel@tonic-gate cvp = NULL; 2377c478bd9Sstevel@tonic-gate if (rpnp) 2387c478bd9Sstevel@tonic-gate rpnp->pn_pathlen = 0; 239da6c28aaSamw 2407c478bd9Sstevel@tonic-gate lookup_flags = dirvpp ? LOOKUP_DIR : 0; 241da6c28aaSamw if (flags & FIGNORECASE) { 242da6c28aaSamw lookup_flags |= FIGNORECASE; 243da6c28aaSamw pn_alloc(&presrvd); 244da6c28aaSamw pp = &presrvd; 245da6c28aaSamw } 246da6c28aaSamw 2477c478bd9Sstevel@tonic-gate if (audit_active) 2487c478bd9Sstevel@tonic-gate audit_anchorpath(pnp, vp == rootvp); 2497c478bd9Sstevel@tonic-gate 2507c478bd9Sstevel@tonic-gate /* 2517c478bd9Sstevel@tonic-gate * Eliminate any trailing slashes in the pathname. 2527c478bd9Sstevel@tonic-gate * If there are any, we must follow all symlinks. 2537c478bd9Sstevel@tonic-gate * Also, we must guarantee that the last component is a directory. 2547c478bd9Sstevel@tonic-gate */ 2557c478bd9Sstevel@tonic-gate if (pn_fixslash(pnp)) { 2567c478bd9Sstevel@tonic-gate flags |= FOLLOW; 2577c478bd9Sstevel@tonic-gate must_be_directory = 1; 2587c478bd9Sstevel@tonic-gate } 2597c478bd9Sstevel@tonic-gate 2607c478bd9Sstevel@tonic-gate startvp = vp; 2617c478bd9Sstevel@tonic-gate next: 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 if (audit_active) 2787c478bd9Sstevel@tonic-gate audit_addcomponent(pnp); 2797c478bd9Sstevel@tonic-gate goto bad; 2807c478bd9Sstevel@tonic-gate } 2817c478bd9Sstevel@tonic-gate 2827c478bd9Sstevel@tonic-gate /* 2837c478bd9Sstevel@tonic-gate * Handle "..": two special cases. 2847c478bd9Sstevel@tonic-gate * 1. If we're at the root directory (e.g. after chroot or 2857c478bd9Sstevel@tonic-gate * zone_enter) then change ".." to "." so we can't get 2867c478bd9Sstevel@tonic-gate * out of this subtree. 2877c478bd9Sstevel@tonic-gate * 2. If this vnode is the root of a mounted file system, 2887c478bd9Sstevel@tonic-gate * then replace it with the vnode that was mounted on 2897c478bd9Sstevel@tonic-gate * so that we take the ".." in the other file system. 2907c478bd9Sstevel@tonic-gate */ 2917c478bd9Sstevel@tonic-gate if (component[0] == '.' && component[1] == '.' && component[2] == 0) { 2927c478bd9Sstevel@tonic-gate checkforroot: 2937c478bd9Sstevel@tonic-gate if (VN_CMP(vp, rootvp) || VN_CMP(vp, zonevp)) { 2947c478bd9Sstevel@tonic-gate component[1] = '\0'; 2957c478bd9Sstevel@tonic-gate } else if (vp->v_flag & VROOT) { 2967c478bd9Sstevel@tonic-gate vfs_t *vfsp; 2977c478bd9Sstevel@tonic-gate cvp = vp; 2987c478bd9Sstevel@tonic-gate 2997c478bd9Sstevel@tonic-gate /* 3007c478bd9Sstevel@tonic-gate * While we deal with the vfs pointer from the vnode 3017c478bd9Sstevel@tonic-gate * the filesystem could have been forcefully unmounted 3027c478bd9Sstevel@tonic-gate * and the vnode's v_vfsp could have been invalidated 3037c478bd9Sstevel@tonic-gate * by VFS_UNMOUNT. Hence, we cache v_vfsp and use it 3047c478bd9Sstevel@tonic-gate * with vfs_rlock_wait/vfs_unlock. 3057c478bd9Sstevel@tonic-gate * It is safe to use the v_vfsp even it is freed by 3067c478bd9Sstevel@tonic-gate * VFS_UNMOUNT because vfs_rlock_wait/vfs_unlock 3077c478bd9Sstevel@tonic-gate * do not dereference v_vfsp. It is just used as a 3087c478bd9Sstevel@tonic-gate * magic cookie. 3097c478bd9Sstevel@tonic-gate * One more corner case here is the memory getting 3107c478bd9Sstevel@tonic-gate * reused for another vfs structure. In this case 3117c478bd9Sstevel@tonic-gate * lookuppnvp's vfs_rlock_wait will succeed, domount's 3127c478bd9Sstevel@tonic-gate * vfs_lock will fail and domount will bail out with an 3137c478bd9Sstevel@tonic-gate * error (EBUSY). 3147c478bd9Sstevel@tonic-gate */ 3157c478bd9Sstevel@tonic-gate vfsp = cvp->v_vfsp; 3167c478bd9Sstevel@tonic-gate 3177c478bd9Sstevel@tonic-gate /* 3187c478bd9Sstevel@tonic-gate * This lock is used to synchronize 3197c478bd9Sstevel@tonic-gate * mounts/unmounts and lookups. 3207c478bd9Sstevel@tonic-gate * Threads doing mounts/unmounts hold the 3217c478bd9Sstevel@tonic-gate * writers version vfs_lock_wait(). 3227c478bd9Sstevel@tonic-gate */ 3237c478bd9Sstevel@tonic-gate 3247c478bd9Sstevel@tonic-gate vfs_rlock_wait(vfsp); 3257c478bd9Sstevel@tonic-gate 3267c478bd9Sstevel@tonic-gate /* 3277c478bd9Sstevel@tonic-gate * If this vnode is on a file system that 3287c478bd9Sstevel@tonic-gate * has been forcibly unmounted, 3297c478bd9Sstevel@tonic-gate * we can't proceed. Cancel this operation 3307c478bd9Sstevel@tonic-gate * and return EIO. 3317c478bd9Sstevel@tonic-gate * 3327c478bd9Sstevel@tonic-gate * vfs_vnodecovered is NULL if unmounted. 3337c478bd9Sstevel@tonic-gate * Currently, nfs uses VFS_UNMOUNTED to 3347c478bd9Sstevel@tonic-gate * check if it's a forced-umount. Keep the 3357c478bd9Sstevel@tonic-gate * same checking here as well even though it 3367c478bd9Sstevel@tonic-gate * may not be needed. 3377c478bd9Sstevel@tonic-gate */ 3387c478bd9Sstevel@tonic-gate if (((vp = cvp->v_vfsp->vfs_vnodecovered) == NULL) || 3397c478bd9Sstevel@tonic-gate (cvp->v_vfsp->vfs_flag & VFS_UNMOUNTED)) { 3407c478bd9Sstevel@tonic-gate vfs_unlock(vfsp); 3417c478bd9Sstevel@tonic-gate VN_RELE(cvp); 342da6c28aaSamw if (pp) 343da6c28aaSamw pn_free(pp); 3447c478bd9Sstevel@tonic-gate return (EIO); 3457c478bd9Sstevel@tonic-gate } 3467c478bd9Sstevel@tonic-gate VN_HOLD(vp); 3477c478bd9Sstevel@tonic-gate vfs_unlock(vfsp); 3487c478bd9Sstevel@tonic-gate VN_RELE(cvp); 3497c478bd9Sstevel@tonic-gate cvp = NULL; 3502e538c1cSvv /* 3512e538c1cSvv * Crossing mount points. For eg: We are doing 3522e538c1cSvv * a lookup of ".." for file systems root vnode 3532e538c1cSvv * mounted here, and VOP_LOOKUP() (with covered vnode) 3542e538c1cSvv * will be on underlying file systems mount point 3552e538c1cSvv * vnode. Set retry_with_kcred flag as we might end 3562e538c1cSvv * up doing VOP_LOOKUP() with kcred if required. 3572e538c1cSvv */ 3582e538c1cSvv retry_with_kcred = B_TRUE; 3597c478bd9Sstevel@tonic-gate goto checkforroot; 3607c478bd9Sstevel@tonic-gate } 3617c478bd9Sstevel@tonic-gate } 3627c478bd9Sstevel@tonic-gate 3637c478bd9Sstevel@tonic-gate /* 3647c478bd9Sstevel@tonic-gate * LOOKUP_CHECKREAD is a private flag used by vnodetopath() to indicate 3657c478bd9Sstevel@tonic-gate * that we need to have read permission on every directory in the entire 3667c478bd9Sstevel@tonic-gate * path. This is used to ensure that a forward-lookup of a cached value 3677c478bd9Sstevel@tonic-gate * has the same effect as a reverse-lookup when the cached value cannot 3687c478bd9Sstevel@tonic-gate * be found. 3697c478bd9Sstevel@tonic-gate */ 3707c478bd9Sstevel@tonic-gate if ((flags & LOOKUP_CHECKREAD) && 371da6c28aaSamw (error = VOP_ACCESS(vp, VREAD, 0, cr, NULL)) != 0) 3727c478bd9Sstevel@tonic-gate goto bad; 3737c478bd9Sstevel@tonic-gate 3747c478bd9Sstevel@tonic-gate /* 3757c478bd9Sstevel@tonic-gate * Perform a lookup in the current directory. 3767c478bd9Sstevel@tonic-gate */ 3777c478bd9Sstevel@tonic-gate error = VOP_LOOKUP(vp, component, &tvp, pnp, lookup_flags, 378da6c28aaSamw rootvp, cr, NULL, NULL, pp); 3792e538c1cSvv 3802e538c1cSvv /* 3812e538c1cSvv * Retry with kcred - If crossing mount points & error is EACCES. 3822e538c1cSvv * 3832e538c1cSvv * If we are crossing mount points here and doing ".." lookup, 3842e538c1cSvv * VOP_LOOKUP() might fail if the underlying file systems 3852e538c1cSvv * mount point has no execute permission. In cases like these, 3862e538c1cSvv * we retry VOP_LOOKUP() by giving as much privilage as possible 3872e538c1cSvv * by passing kcred credentials. 3882e538c1cSvv * 3892e538c1cSvv * In case of hierarchical file systems, passing kcred still may 3902e538c1cSvv * or may not work. 3912e538c1cSvv * For eg: UFS FS --> Mount NFS FS --> Again mount UFS on some 3922e538c1cSvv * directory inside NFS FS. 3932e538c1cSvv */ 3942e538c1cSvv if ((error == EACCES) && retry_with_kcred) 3952e538c1cSvv error = VOP_LOOKUP(vp, component, &tvp, pnp, lookup_flags, 396da6c28aaSamw rootvp, zone_kcred(), NULL, NULL, pp); 3972e538c1cSvv 3987c478bd9Sstevel@tonic-gate cvp = tvp; 3997c478bd9Sstevel@tonic-gate if (error) { 4007c478bd9Sstevel@tonic-gate cvp = NULL; 4017c478bd9Sstevel@tonic-gate /* 4027c478bd9Sstevel@tonic-gate * On error, return hard error if 4037c478bd9Sstevel@tonic-gate * (a) we're not at the end of the pathname yet, or 4047c478bd9Sstevel@tonic-gate * (b) the caller didn't want the parent directory, or 4057c478bd9Sstevel@tonic-gate * (c) we failed for some reason other than a missing entry. 4067c478bd9Sstevel@tonic-gate */ 4077c478bd9Sstevel@tonic-gate if (pn_pathleft(pnp) || dirvpp == NULL || error != ENOENT) 4087c478bd9Sstevel@tonic-gate goto bad; 4097c478bd9Sstevel@tonic-gate if (audit_active) { /* directory access */ 4107c478bd9Sstevel@tonic-gate if (error = audit_savepath(pnp, vp, error, cr)) 4117c478bd9Sstevel@tonic-gate goto bad_noaudit; 4127c478bd9Sstevel@tonic-gate } 4137c478bd9Sstevel@tonic-gate pn_setlast(pnp); 4147c478bd9Sstevel@tonic-gate /* 4157c478bd9Sstevel@tonic-gate * We inform the caller that the desired entry must be 4167c478bd9Sstevel@tonic-gate * a directory by adding a '/' to the component name. 4177c478bd9Sstevel@tonic-gate */ 4187c478bd9Sstevel@tonic-gate if (must_be_directory && (error = pn_addslash(pnp)) != 0) 4197c478bd9Sstevel@tonic-gate goto bad; 4207c478bd9Sstevel@tonic-gate *dirvpp = vp; 4217c478bd9Sstevel@tonic-gate if (compvpp != NULL) 4227c478bd9Sstevel@tonic-gate *compvpp = NULL; 4237c478bd9Sstevel@tonic-gate if (rootvp != rootdir) 4247c478bd9Sstevel@tonic-gate VN_RELE(rootvp); 425da6c28aaSamw if (pp) 426da6c28aaSamw pn_free(pp); 4277c478bd9Sstevel@tonic-gate return (0); 4287c478bd9Sstevel@tonic-gate } 4297c478bd9Sstevel@tonic-gate 4307c478bd9Sstevel@tonic-gate /* 4317c478bd9Sstevel@tonic-gate * Traverse mount points. 4327c478bd9Sstevel@tonic-gate * XXX why don't we need to hold a read lock here (call vn_vfsrlock)? 4337c478bd9Sstevel@tonic-gate * What prevents a concurrent update to v_vfsmountedhere? 4347c478bd9Sstevel@tonic-gate * Possible answer: if mounting, we might not see the mount 4357c478bd9Sstevel@tonic-gate * if it is concurrently coming into existence, but that's 4367c478bd9Sstevel@tonic-gate * really not much different from the thread running a bit slower. 4377c478bd9Sstevel@tonic-gate * If unmounting, we may get into traverse() when we shouldn't, 4387c478bd9Sstevel@tonic-gate * but traverse() will catch this case for us. 4397c478bd9Sstevel@tonic-gate * (For this to work, fetching v_vfsmountedhere had better 4407c478bd9Sstevel@tonic-gate * be atomic!) 4417c478bd9Sstevel@tonic-gate */ 4427c478bd9Sstevel@tonic-gate if (vn_mountedvfs(cvp) != NULL) { 4437c478bd9Sstevel@tonic-gate tvp = cvp; 4447c478bd9Sstevel@tonic-gate if ((error = traverse(&tvp)) != 0) { 4457c478bd9Sstevel@tonic-gate /* 4467c478bd9Sstevel@tonic-gate * It is required to assign cvp here, because 4477c478bd9Sstevel@tonic-gate * traverse() will return a held vnode which 4487c478bd9Sstevel@tonic-gate * may different than the vnode that was passed 4497c478bd9Sstevel@tonic-gate * in (even in the error case). If traverse() 4507c478bd9Sstevel@tonic-gate * changes the vnode it releases the original, 4517c478bd9Sstevel@tonic-gate * and holds the new one. 4527c478bd9Sstevel@tonic-gate */ 4537c478bd9Sstevel@tonic-gate cvp = tvp; 4547c478bd9Sstevel@tonic-gate goto bad; 4557c478bd9Sstevel@tonic-gate } 4567c478bd9Sstevel@tonic-gate cvp = tvp; 4577c478bd9Sstevel@tonic-gate } 4587c478bd9Sstevel@tonic-gate 4597c478bd9Sstevel@tonic-gate /* 4607c478bd9Sstevel@tonic-gate * If we hit a symbolic link and there is more path to be 4617c478bd9Sstevel@tonic-gate * translated or this operation does not wish to apply 4627c478bd9Sstevel@tonic-gate * to a link, then place the contents of the link at the 4637c478bd9Sstevel@tonic-gate * front of the remaining pathname. 4647c478bd9Sstevel@tonic-gate */ 4657c478bd9Sstevel@tonic-gate if (cvp->v_type == VLNK && ((flags & FOLLOW) || pn_pathleft(pnp))) { 4667c478bd9Sstevel@tonic-gate struct pathname linkpath; 4677c478bd9Sstevel@tonic-gate if (audit_active) { 4687c478bd9Sstevel@tonic-gate if (error = audit_pathcomp(pnp, cvp, cr)) 4697c478bd9Sstevel@tonic-gate goto bad; 4707c478bd9Sstevel@tonic-gate } 4717c478bd9Sstevel@tonic-gate 4727c478bd9Sstevel@tonic-gate if (++nlink > MAXSYMLINKS) { 4737c478bd9Sstevel@tonic-gate error = ELOOP; 4747c478bd9Sstevel@tonic-gate goto bad; 4757c478bd9Sstevel@tonic-gate } 4767c478bd9Sstevel@tonic-gate pn_alloc(&linkpath); 4777c478bd9Sstevel@tonic-gate if (error = pn_getsymlink(cvp, &linkpath, cr)) { 4787c478bd9Sstevel@tonic-gate pn_free(&linkpath); 4797c478bd9Sstevel@tonic-gate goto bad; 4807c478bd9Sstevel@tonic-gate } 4817c478bd9Sstevel@tonic-gate 4827c478bd9Sstevel@tonic-gate if (audit_active) 4837c478bd9Sstevel@tonic-gate audit_symlink(pnp, &linkpath); 4847c478bd9Sstevel@tonic-gate 4857c478bd9Sstevel@tonic-gate if (pn_pathleft(&linkpath) == 0) 4867c478bd9Sstevel@tonic-gate (void) pn_set(&linkpath, "."); 4877c478bd9Sstevel@tonic-gate error = pn_insert(pnp, &linkpath, strlen(component)); 4887c478bd9Sstevel@tonic-gate pn_free(&linkpath); 4897c478bd9Sstevel@tonic-gate if (error) 4907c478bd9Sstevel@tonic-gate goto bad; 4917c478bd9Sstevel@tonic-gate VN_RELE(cvp); 4927c478bd9Sstevel@tonic-gate cvp = NULL; 4937c478bd9Sstevel@tonic-gate if (pnp->pn_pathlen == 0) { 4947c478bd9Sstevel@tonic-gate error = ENOENT; 4957c478bd9Sstevel@tonic-gate goto bad; 4967c478bd9Sstevel@tonic-gate } 4977c478bd9Sstevel@tonic-gate if (pnp->pn_path[0] == '/') { 4987c478bd9Sstevel@tonic-gate do { 4997c478bd9Sstevel@tonic-gate pnp->pn_path++; 5007c478bd9Sstevel@tonic-gate pnp->pn_pathlen--; 5017c478bd9Sstevel@tonic-gate } while (pnp->pn_path[0] == '/'); 5027c478bd9Sstevel@tonic-gate VN_RELE(vp); 5037c478bd9Sstevel@tonic-gate vp = rootvp; 5047c478bd9Sstevel@tonic-gate VN_HOLD(vp); 5057c478bd9Sstevel@tonic-gate } 5067c478bd9Sstevel@tonic-gate if (audit_active) 5077c478bd9Sstevel@tonic-gate audit_anchorpath(pnp, vp == rootvp); 5087c478bd9Sstevel@tonic-gate if (pn_fixslash(pnp)) { 5097c478bd9Sstevel@tonic-gate flags |= FOLLOW; 5107c478bd9Sstevel@tonic-gate must_be_directory = 1; 5117c478bd9Sstevel@tonic-gate } 5127c478bd9Sstevel@tonic-gate goto next; 5137c478bd9Sstevel@tonic-gate } 5147c478bd9Sstevel@tonic-gate 5157c478bd9Sstevel@tonic-gate /* 5167c478bd9Sstevel@tonic-gate * If rpnp is non-NULL, remember the resolved path name therein. 5177c478bd9Sstevel@tonic-gate * Do not include "." components. Collapse occurrences of 5187c478bd9Sstevel@tonic-gate * "previous/..", so long as "previous" is not itself "..". 5197c478bd9Sstevel@tonic-gate * Exhausting rpnp results in error ENAMETOOLONG. 5207c478bd9Sstevel@tonic-gate */ 5217c478bd9Sstevel@tonic-gate if (rpnp && strcmp(component, ".") != 0) { 5227c478bd9Sstevel@tonic-gate size_t len; 5237c478bd9Sstevel@tonic-gate 5247c478bd9Sstevel@tonic-gate if (strcmp(component, "..") == 0 && 5257c478bd9Sstevel@tonic-gate rpnp->pn_pathlen != 0 && 5267c478bd9Sstevel@tonic-gate !((rpnp->pn_pathlen > 2 && 5277c478bd9Sstevel@tonic-gate strncmp(rpnp->pn_path+rpnp->pn_pathlen-3, "/..", 3) == 0) || 5287c478bd9Sstevel@tonic-gate (rpnp->pn_pathlen == 2 && 5297c478bd9Sstevel@tonic-gate strncmp(rpnp->pn_path, "..", 2) == 0))) { 5307c478bd9Sstevel@tonic-gate while (rpnp->pn_pathlen && 5317c478bd9Sstevel@tonic-gate rpnp->pn_path[rpnp->pn_pathlen-1] != '/') 5327c478bd9Sstevel@tonic-gate rpnp->pn_pathlen--; 5337c478bd9Sstevel@tonic-gate if (rpnp->pn_pathlen > 1) 5347c478bd9Sstevel@tonic-gate rpnp->pn_pathlen--; 5357c478bd9Sstevel@tonic-gate rpnp->pn_path[rpnp->pn_pathlen] = '\0'; 5367c478bd9Sstevel@tonic-gate } else { 5377c478bd9Sstevel@tonic-gate if (rpnp->pn_pathlen != 0 && 5387c478bd9Sstevel@tonic-gate rpnp->pn_path[rpnp->pn_pathlen-1] != '/') 5397c478bd9Sstevel@tonic-gate rpnp->pn_path[rpnp->pn_pathlen++] = '/'; 540da6c28aaSamw if (flags & FIGNORECASE) { 541da6c28aaSamw /* 542da6c28aaSamw * Return the case-preserved name 543da6c28aaSamw * within the resolved path. 544da6c28aaSamw */ 545ab04eb8eStimh error = copystr(pp->pn_buf, 546da6c28aaSamw rpnp->pn_path + rpnp->pn_pathlen, 547da6c28aaSamw rpnp->pn_bufsize - rpnp->pn_pathlen, &len); 548da6c28aaSamw } else { 549da6c28aaSamw error = copystr(component, 550da6c28aaSamw rpnp->pn_path + rpnp->pn_pathlen, 551da6c28aaSamw rpnp->pn_bufsize - rpnp->pn_pathlen, &len); 552da6c28aaSamw } 5537c478bd9Sstevel@tonic-gate if (error) /* copystr() returns ENAMETOOLONG */ 5547c478bd9Sstevel@tonic-gate goto bad; 5557c478bd9Sstevel@tonic-gate rpnp->pn_pathlen += (len - 1); 5567c478bd9Sstevel@tonic-gate ASSERT(rpnp->pn_bufsize > rpnp->pn_pathlen); 5577c478bd9Sstevel@tonic-gate } 5587c478bd9Sstevel@tonic-gate } 5597c478bd9Sstevel@tonic-gate 5607c478bd9Sstevel@tonic-gate /* 5617c478bd9Sstevel@tonic-gate * If no more components, return last directory (if wanted) and 5627c478bd9Sstevel@tonic-gate * last component (if wanted). 5637c478bd9Sstevel@tonic-gate */ 5647c478bd9Sstevel@tonic-gate if (pn_pathleft(pnp) == 0) { 5657c478bd9Sstevel@tonic-gate /* 5667c478bd9Sstevel@tonic-gate * If there was a trailing slash in the pathname, 5677c478bd9Sstevel@tonic-gate * make sure the last component is a directory. 5687c478bd9Sstevel@tonic-gate */ 5697c478bd9Sstevel@tonic-gate if (must_be_directory && cvp->v_type != VDIR) { 5707c478bd9Sstevel@tonic-gate error = ENOTDIR; 5717c478bd9Sstevel@tonic-gate goto bad; 5727c478bd9Sstevel@tonic-gate } 5737c478bd9Sstevel@tonic-gate if (dirvpp != NULL) { 5747c478bd9Sstevel@tonic-gate /* 5757c478bd9Sstevel@tonic-gate * Check that we have the real parent and not 5767c478bd9Sstevel@tonic-gate * an alias of the last component. 5777c478bd9Sstevel@tonic-gate */ 5787c478bd9Sstevel@tonic-gate if (vn_compare(vp, cvp)) { 5797c478bd9Sstevel@tonic-gate if (audit_active) 5807c478bd9Sstevel@tonic-gate (void) audit_savepath(pnp, cvp, 5812e538c1cSvv EINVAL, cr); 5827c478bd9Sstevel@tonic-gate pn_setlast(pnp); 5837c478bd9Sstevel@tonic-gate VN_RELE(vp); 5847c478bd9Sstevel@tonic-gate VN_RELE(cvp); 5857c478bd9Sstevel@tonic-gate if (rootvp != rootdir) 5867c478bd9Sstevel@tonic-gate VN_RELE(rootvp); 587da6c28aaSamw if (pp) 588da6c28aaSamw pn_free(pp); 5897c478bd9Sstevel@tonic-gate return (EINVAL); 5907c478bd9Sstevel@tonic-gate } 5917c478bd9Sstevel@tonic-gate if (audit_active) { 5927c478bd9Sstevel@tonic-gate if (error = audit_pathcomp(pnp, vp, cr)) 5937c478bd9Sstevel@tonic-gate goto bad; 5947c478bd9Sstevel@tonic-gate } 5957c478bd9Sstevel@tonic-gate *dirvpp = vp; 5967c478bd9Sstevel@tonic-gate } else 5977c478bd9Sstevel@tonic-gate VN_RELE(vp); 5987c478bd9Sstevel@tonic-gate if (audit_active) 5997c478bd9Sstevel@tonic-gate (void) audit_savepath(pnp, cvp, 0, cr); 6007c478bd9Sstevel@tonic-gate if (pnp->pn_path == pnp->pn_buf) 6017c478bd9Sstevel@tonic-gate (void) pn_set(pnp, "."); 6027c478bd9Sstevel@tonic-gate else 6037c478bd9Sstevel@tonic-gate pn_setlast(pnp); 6047c478bd9Sstevel@tonic-gate if (rpnp) { 6057c478bd9Sstevel@tonic-gate if (VN_CMP(cvp, rootvp)) 6067c478bd9Sstevel@tonic-gate (void) pn_set(rpnp, "/"); 6077c478bd9Sstevel@tonic-gate else if (rpnp->pn_pathlen == 0) 6087c478bd9Sstevel@tonic-gate (void) pn_set(rpnp, "."); 6097c478bd9Sstevel@tonic-gate } 6107c478bd9Sstevel@tonic-gate 6117c478bd9Sstevel@tonic-gate if (compvpp != NULL) 6127c478bd9Sstevel@tonic-gate *compvpp = cvp; 6137c478bd9Sstevel@tonic-gate else 6147c478bd9Sstevel@tonic-gate VN_RELE(cvp); 6157c478bd9Sstevel@tonic-gate if (rootvp != rootdir) 6167c478bd9Sstevel@tonic-gate VN_RELE(rootvp); 617da6c28aaSamw if (pp) 618da6c28aaSamw pn_free(pp); 6197c478bd9Sstevel@tonic-gate return (0); 6207c478bd9Sstevel@tonic-gate } 6217c478bd9Sstevel@tonic-gate 6227c478bd9Sstevel@tonic-gate if (audit_active) { 6237c478bd9Sstevel@tonic-gate if (error = audit_pathcomp(pnp, cvp, cr)) 6247c478bd9Sstevel@tonic-gate goto bad; 6257c478bd9Sstevel@tonic-gate } 6267c478bd9Sstevel@tonic-gate 6277c478bd9Sstevel@tonic-gate /* 6287c478bd9Sstevel@tonic-gate * Skip over slashes from end of last component. 6297c478bd9Sstevel@tonic-gate */ 6307c478bd9Sstevel@tonic-gate while (pnp->pn_path[0] == '/') { 6317c478bd9Sstevel@tonic-gate pnp->pn_path++; 6327c478bd9Sstevel@tonic-gate pnp->pn_pathlen--; 6337c478bd9Sstevel@tonic-gate } 6347c478bd9Sstevel@tonic-gate 6357c478bd9Sstevel@tonic-gate /* 6367c478bd9Sstevel@tonic-gate * Searched through another level of directory: 6377c478bd9Sstevel@tonic-gate * release previous directory handle and save new (result 6387c478bd9Sstevel@tonic-gate * of lookup) as current directory. 6397c478bd9Sstevel@tonic-gate */ 6407c478bd9Sstevel@tonic-gate VN_RELE(vp); 6417c478bd9Sstevel@tonic-gate vp = cvp; 6427c478bd9Sstevel@tonic-gate cvp = NULL; 6437c478bd9Sstevel@tonic-gate goto next; 6447c478bd9Sstevel@tonic-gate 6457c478bd9Sstevel@tonic-gate bad: 6467c478bd9Sstevel@tonic-gate if (audit_active) /* reached end of path */ 6477c478bd9Sstevel@tonic-gate (void) audit_savepath(pnp, cvp, error, cr); 6487c478bd9Sstevel@tonic-gate bad_noaudit: 6497c478bd9Sstevel@tonic-gate /* 6507c478bd9Sstevel@tonic-gate * Error. Release vnodes and return. 6517c478bd9Sstevel@tonic-gate */ 6527c478bd9Sstevel@tonic-gate if (cvp) 6537c478bd9Sstevel@tonic-gate VN_RELE(cvp); 6547c478bd9Sstevel@tonic-gate /* 6557c478bd9Sstevel@tonic-gate * If the error was ESTALE and the current directory to look in 6567c478bd9Sstevel@tonic-gate * was the root for this lookup, the root for a mounted file 6577c478bd9Sstevel@tonic-gate * system, or the starting directory for lookups, then 6587c478bd9Sstevel@tonic-gate * return ENOENT instead of ESTALE. In this case, no recovery 6597c478bd9Sstevel@tonic-gate * is possible by the higher level. If ESTALE was returned for 6607c478bd9Sstevel@tonic-gate * some intermediate directory along the path, then recovery 6617c478bd9Sstevel@tonic-gate * is potentially possible and retrying from the higher level 6627c478bd9Sstevel@tonic-gate * will either correct the situation by purging stale cache 6637c478bd9Sstevel@tonic-gate * entries or eventually get back to the point where no recovery 6647c478bd9Sstevel@tonic-gate * is possible. 6657c478bd9Sstevel@tonic-gate */ 6667c478bd9Sstevel@tonic-gate if (error == ESTALE && 6677c478bd9Sstevel@tonic-gate (VN_CMP(vp, rootvp) || (vp->v_flag & VROOT) || vp == startvp)) 6687c478bd9Sstevel@tonic-gate error = ENOENT; 6697c478bd9Sstevel@tonic-gate VN_RELE(vp); 6707c478bd9Sstevel@tonic-gate if (rootvp != rootdir) 6717c478bd9Sstevel@tonic-gate VN_RELE(rootvp); 672da6c28aaSamw if (pp) 673da6c28aaSamw pn_free(pp); 6747c478bd9Sstevel@tonic-gate return (error); 6757c478bd9Sstevel@tonic-gate } 6767c478bd9Sstevel@tonic-gate 6777c478bd9Sstevel@tonic-gate /* 6787c478bd9Sstevel@tonic-gate * Traverse a mount point. Routine accepts a vnode pointer as a reference 6797c478bd9Sstevel@tonic-gate * parameter and performs the indirection, releasing the original vnode. 6807c478bd9Sstevel@tonic-gate */ 6817c478bd9Sstevel@tonic-gate int 6827c478bd9Sstevel@tonic-gate traverse(vnode_t **cvpp) 6837c478bd9Sstevel@tonic-gate { 6847c478bd9Sstevel@tonic-gate int error = 0; 6857c478bd9Sstevel@tonic-gate vnode_t *cvp; 6867c478bd9Sstevel@tonic-gate vnode_t *tvp; 6877c478bd9Sstevel@tonic-gate vfs_t *vfsp; 6887c478bd9Sstevel@tonic-gate 6897c478bd9Sstevel@tonic-gate cvp = *cvpp; 6907c478bd9Sstevel@tonic-gate 6917c478bd9Sstevel@tonic-gate /* 6927c478bd9Sstevel@tonic-gate * If this vnode is mounted on, then we transparently indirect 6937c478bd9Sstevel@tonic-gate * to the vnode which is the root of the mounted file system. 6947c478bd9Sstevel@tonic-gate * Before we do this we must check that an unmount is not in 6957c478bd9Sstevel@tonic-gate * progress on this vnode. 6967c478bd9Sstevel@tonic-gate */ 6977c478bd9Sstevel@tonic-gate 6987c478bd9Sstevel@tonic-gate for (;;) { 6997c478bd9Sstevel@tonic-gate /* 7007c478bd9Sstevel@tonic-gate * Try to read lock the vnode. If this fails because 7017c478bd9Sstevel@tonic-gate * the vnode is already write locked, then check to 7027c478bd9Sstevel@tonic-gate * see whether it is the current thread which locked 7037c478bd9Sstevel@tonic-gate * the vnode. If it is not, then read lock the vnode 7047c478bd9Sstevel@tonic-gate * by waiting to acquire the lock. 7057c478bd9Sstevel@tonic-gate * 7067c478bd9Sstevel@tonic-gate * The code path in domount() is an example of support 7077c478bd9Sstevel@tonic-gate * which needs to look up two pathnames and locks one 7087c478bd9Sstevel@tonic-gate * of them in between the two lookups. 7097c478bd9Sstevel@tonic-gate */ 7107c478bd9Sstevel@tonic-gate error = vn_vfsrlock(cvp); 7117c478bd9Sstevel@tonic-gate if (error) { 7127c478bd9Sstevel@tonic-gate if (!vn_vfswlock_held(cvp)) 7137c478bd9Sstevel@tonic-gate error = vn_vfsrlock_wait(cvp); 7147c478bd9Sstevel@tonic-gate if (error != 0) { 7157c478bd9Sstevel@tonic-gate /* 7167c478bd9Sstevel@tonic-gate * lookuppn() expects a held vnode to be 7177c478bd9Sstevel@tonic-gate * returned because it promptly calls 7187c478bd9Sstevel@tonic-gate * VN_RELE after the error return 7197c478bd9Sstevel@tonic-gate */ 7207c478bd9Sstevel@tonic-gate *cvpp = cvp; 7217c478bd9Sstevel@tonic-gate return (error); 7227c478bd9Sstevel@tonic-gate } 7237c478bd9Sstevel@tonic-gate } 7247c478bd9Sstevel@tonic-gate 7257c478bd9Sstevel@tonic-gate /* 7267c478bd9Sstevel@tonic-gate * Reached the end of the mount chain? 7277c478bd9Sstevel@tonic-gate */ 7287c478bd9Sstevel@tonic-gate vfsp = vn_mountedvfs(cvp); 7297c478bd9Sstevel@tonic-gate if (vfsp == NULL) { 7307c478bd9Sstevel@tonic-gate vn_vfsunlock(cvp); 7317c478bd9Sstevel@tonic-gate break; 7327c478bd9Sstevel@tonic-gate } 7337c478bd9Sstevel@tonic-gate 7347c478bd9Sstevel@tonic-gate /* 7357c478bd9Sstevel@tonic-gate * The read lock must be held across the call to VFS_ROOT() to 7367c478bd9Sstevel@tonic-gate * prevent a concurrent unmount from destroying the vfs. 7377c478bd9Sstevel@tonic-gate */ 7387c478bd9Sstevel@tonic-gate error = VFS_ROOT(vfsp, &tvp); 7397c478bd9Sstevel@tonic-gate vn_vfsunlock(cvp); 7407c478bd9Sstevel@tonic-gate 7417c478bd9Sstevel@tonic-gate if (error) 7427c478bd9Sstevel@tonic-gate break; 7437c478bd9Sstevel@tonic-gate 7447c478bd9Sstevel@tonic-gate VN_RELE(cvp); 7457c478bd9Sstevel@tonic-gate 7467c478bd9Sstevel@tonic-gate cvp = tvp; 7477c478bd9Sstevel@tonic-gate } 7487c478bd9Sstevel@tonic-gate 7497c478bd9Sstevel@tonic-gate *cvpp = cvp; 7507c478bd9Sstevel@tonic-gate return (error); 7517c478bd9Sstevel@tonic-gate } 7527c478bd9Sstevel@tonic-gate 7537c478bd9Sstevel@tonic-gate /* 7547c478bd9Sstevel@tonic-gate * Return the lowermost vnode if this is a mountpoint. 7557c478bd9Sstevel@tonic-gate */ 7567c478bd9Sstevel@tonic-gate static vnode_t * 7577c478bd9Sstevel@tonic-gate vn_under(vnode_t *vp) 7587c478bd9Sstevel@tonic-gate { 7597c478bd9Sstevel@tonic-gate vnode_t *uvp; 7607c478bd9Sstevel@tonic-gate vfs_t *vfsp; 7617c478bd9Sstevel@tonic-gate 7627c478bd9Sstevel@tonic-gate while (vp->v_flag & VROOT) { 7637c478bd9Sstevel@tonic-gate 7647c478bd9Sstevel@tonic-gate vfsp = vp->v_vfsp; 7657c478bd9Sstevel@tonic-gate vfs_rlock_wait(vfsp); 7667c478bd9Sstevel@tonic-gate if ((uvp = vfsp->vfs_vnodecovered) == NULL || 7677c478bd9Sstevel@tonic-gate (vfsp->vfs_flag & VFS_UNMOUNTED)) { 7687c478bd9Sstevel@tonic-gate vfs_unlock(vfsp); 7697c478bd9Sstevel@tonic-gate break; 7707c478bd9Sstevel@tonic-gate } 7717c478bd9Sstevel@tonic-gate VN_HOLD(uvp); 7727c478bd9Sstevel@tonic-gate vfs_unlock(vfsp); 7737c478bd9Sstevel@tonic-gate VN_RELE(vp); 7747c478bd9Sstevel@tonic-gate vp = uvp; 7757c478bd9Sstevel@tonic-gate } 7767c478bd9Sstevel@tonic-gate 7777c478bd9Sstevel@tonic-gate return (vp); 7787c478bd9Sstevel@tonic-gate } 7797c478bd9Sstevel@tonic-gate 7807c478bd9Sstevel@tonic-gate static int 7817c478bd9Sstevel@tonic-gate vnode_match(vnode_t *v1, vnode_t *v2, cred_t *cr) 7827c478bd9Sstevel@tonic-gate { 7837c478bd9Sstevel@tonic-gate vattr_t v1attr, v2attr; 7847c478bd9Sstevel@tonic-gate 7857c478bd9Sstevel@tonic-gate /* 7867c478bd9Sstevel@tonic-gate * If we have a device file, check to see if is a cloned open of the 7877c478bd9Sstevel@tonic-gate * same device. For self-cloning devices, the major numbers will match. 7887c478bd9Sstevel@tonic-gate * For devices cloned through the 'clone' driver, the minor number of 7897c478bd9Sstevel@tonic-gate * the source device will be the same as the major number of the cloned 7907c478bd9Sstevel@tonic-gate * device. 7917c478bd9Sstevel@tonic-gate */ 7927c478bd9Sstevel@tonic-gate if ((v1->v_type == VCHR || v1->v_type == VBLK) && 7937c478bd9Sstevel@tonic-gate v1->v_type == v2->v_type) { 7947c478bd9Sstevel@tonic-gate if ((spec_is_selfclone(v1) || spec_is_selfclone(v2)) && 7957c478bd9Sstevel@tonic-gate getmajor(v1->v_rdev) == getmajor(v2->v_rdev)) 7967c478bd9Sstevel@tonic-gate return (1); 7977c478bd9Sstevel@tonic-gate 7987c478bd9Sstevel@tonic-gate if (spec_is_clone(v1) && 7997c478bd9Sstevel@tonic-gate getmajor(v1->v_rdev) == getminor(v2->v_rdev)) 8007c478bd9Sstevel@tonic-gate return (1); 8017c478bd9Sstevel@tonic-gate 8027c478bd9Sstevel@tonic-gate if (spec_is_clone(v2) && 8037c478bd9Sstevel@tonic-gate getmajor(v2->v_rdev) == getminor(v1->v_rdev)) 8047c478bd9Sstevel@tonic-gate return (1); 8057c478bd9Sstevel@tonic-gate } 8067c478bd9Sstevel@tonic-gate 8077c478bd9Sstevel@tonic-gate v1attr.va_mask = v2attr.va_mask = AT_TYPE; 8087c478bd9Sstevel@tonic-gate 8097c478bd9Sstevel@tonic-gate /* 8107c478bd9Sstevel@tonic-gate * This check for symbolic links handles the pseudo-symlinks in procfs. 8117c478bd9Sstevel@tonic-gate * These particular links have v_type of VDIR, but the attributes have a 8127c478bd9Sstevel@tonic-gate * type of VLNK. We need to avoid these links because otherwise if we 8137c478bd9Sstevel@tonic-gate * are currently in '/proc/self/fd', then '/proc/self/cwd' will compare 8147c478bd9Sstevel@tonic-gate * as the same vnode. 8157c478bd9Sstevel@tonic-gate */ 816da6c28aaSamw if (VOP_GETATTR(v1, &v1attr, 0, cr, NULL) != 0 || 817da6c28aaSamw VOP_GETATTR(v2, &v2attr, 0, cr, NULL) != 0 || 8187c478bd9Sstevel@tonic-gate v1attr.va_type == VLNK || v2attr.va_type == VLNK) 8197c478bd9Sstevel@tonic-gate return (0); 8207c478bd9Sstevel@tonic-gate 8217c478bd9Sstevel@tonic-gate v1attr.va_mask = v2attr.va_mask = AT_TYPE | AT_FSID | AT_NODEID; 8227c478bd9Sstevel@tonic-gate 823da6c28aaSamw if (VOP_GETATTR(v1, &v1attr, ATTR_REAL, cr, NULL) != 0 || 824da6c28aaSamw VOP_GETATTR(v2, &v2attr, ATTR_REAL, cr, NULL) != 0) 8257c478bd9Sstevel@tonic-gate return (0); 8267c478bd9Sstevel@tonic-gate 8277c478bd9Sstevel@tonic-gate return (v1attr.va_fsid == v2attr.va_fsid && 8287c478bd9Sstevel@tonic-gate v1attr.va_nodeid == v2attr.va_nodeid); 8297c478bd9Sstevel@tonic-gate } 8307c478bd9Sstevel@tonic-gate 8317c478bd9Sstevel@tonic-gate 8327c478bd9Sstevel@tonic-gate /* 8337c478bd9Sstevel@tonic-gate * Find the entry in the directory corresponding to the target vnode. 8347c478bd9Sstevel@tonic-gate */ 8357c478bd9Sstevel@tonic-gate int 8367c478bd9Sstevel@tonic-gate dirfindvp(vnode_t *vrootp, vnode_t *dvp, vnode_t *tvp, cred_t *cr, char *dbuf, 8377c478bd9Sstevel@tonic-gate size_t dlen, dirent64_t **rdp) 8387c478bd9Sstevel@tonic-gate { 8397c478bd9Sstevel@tonic-gate size_t dbuflen; 8407c478bd9Sstevel@tonic-gate struct iovec iov; 8417c478bd9Sstevel@tonic-gate struct uio uio; 842fa9e4066Sahrens int error; 8437c478bd9Sstevel@tonic-gate int eof; 8447c478bd9Sstevel@tonic-gate vnode_t *cmpvp; 8457c478bd9Sstevel@tonic-gate struct dirent64 *dp; 8467c478bd9Sstevel@tonic-gate pathname_t pnp; 8477c478bd9Sstevel@tonic-gate 8487c478bd9Sstevel@tonic-gate ASSERT(dvp->v_type == VDIR); 8497c478bd9Sstevel@tonic-gate 8507c478bd9Sstevel@tonic-gate /* 8517c478bd9Sstevel@tonic-gate * This is necessary because of the strange semantics of VOP_LOOKUP(). 8527c478bd9Sstevel@tonic-gate */ 8537c478bd9Sstevel@tonic-gate bzero(&pnp, sizeof (pnp)); 8547c478bd9Sstevel@tonic-gate 8557c478bd9Sstevel@tonic-gate eof = 0; 8567c478bd9Sstevel@tonic-gate 8577c478bd9Sstevel@tonic-gate uio.uio_iov = &iov; 8587c478bd9Sstevel@tonic-gate uio.uio_iovcnt = 1; 8597c478bd9Sstevel@tonic-gate uio.uio_segflg = UIO_SYSSPACE; 8607c478bd9Sstevel@tonic-gate uio.uio_fmode = 0; 8617c478bd9Sstevel@tonic-gate uio.uio_extflg = UIO_COPY_CACHED; 8627c478bd9Sstevel@tonic-gate uio.uio_loffset = 0; 8637c478bd9Sstevel@tonic-gate 864da6c28aaSamw if ((error = VOP_ACCESS(dvp, VREAD, 0, cr, NULL)) != 0) 865fa9e4066Sahrens return (error); 8667c478bd9Sstevel@tonic-gate 8677c478bd9Sstevel@tonic-gate while (!eof) { 8687c478bd9Sstevel@tonic-gate uio.uio_resid = dlen; 8697c478bd9Sstevel@tonic-gate iov.iov_base = dbuf; 8707c478bd9Sstevel@tonic-gate iov.iov_len = dlen; 8717c478bd9Sstevel@tonic-gate 8727c478bd9Sstevel@tonic-gate (void) VOP_RWLOCK(dvp, V_WRITELOCK_FALSE, NULL); 873da6c28aaSamw error = VOP_READDIR(dvp, &uio, cr, &eof, NULL, 0); 8747c478bd9Sstevel@tonic-gate VOP_RWUNLOCK(dvp, V_WRITELOCK_FALSE, NULL); 8757c478bd9Sstevel@tonic-gate 8767c478bd9Sstevel@tonic-gate dbuflen = dlen - uio.uio_resid; 8777c478bd9Sstevel@tonic-gate 878fa9e4066Sahrens if (error || dbuflen == 0) 8797c478bd9Sstevel@tonic-gate break; 8807c478bd9Sstevel@tonic-gate 8817c478bd9Sstevel@tonic-gate dp = (dirent64_t *)dbuf; 8827c478bd9Sstevel@tonic-gate while ((intptr_t)dp < (intptr_t)dbuf + dbuflen) { 8837c478bd9Sstevel@tonic-gate /* 8847c478bd9Sstevel@tonic-gate * Ignore '.' and '..' entries 8857c478bd9Sstevel@tonic-gate */ 8867c478bd9Sstevel@tonic-gate if (strcmp(dp->d_name, ".") == 0 || 8877c478bd9Sstevel@tonic-gate strcmp(dp->d_name, "..") == 0) { 8887c478bd9Sstevel@tonic-gate dp = (dirent64_t *)((intptr_t)dp + 8897c478bd9Sstevel@tonic-gate dp->d_reclen); 8907c478bd9Sstevel@tonic-gate continue; 8917c478bd9Sstevel@tonic-gate } 8927c478bd9Sstevel@tonic-gate 893fa9e4066Sahrens error = VOP_LOOKUP(dvp, dp->d_name, &cmpvp, &pnp, 0, 894da6c28aaSamw vrootp, cr, NULL, NULL, NULL); 8957c478bd9Sstevel@tonic-gate 8967c478bd9Sstevel@tonic-gate /* 8977c478bd9Sstevel@tonic-gate * We only want to bail out if there was an error other 8987c478bd9Sstevel@tonic-gate * than ENOENT. Otherwise, it could be that someone 8997c478bd9Sstevel@tonic-gate * just removed an entry since the readdir() call, and 9007c478bd9Sstevel@tonic-gate * the entry we want is further on in the directory. 9017c478bd9Sstevel@tonic-gate */ 902fa9e4066Sahrens if (error == 0) { 9037c478bd9Sstevel@tonic-gate if (vnode_match(tvp, cmpvp, cr)) { 9047c478bd9Sstevel@tonic-gate VN_RELE(cmpvp); 9057c478bd9Sstevel@tonic-gate *rdp = dp; 9067c478bd9Sstevel@tonic-gate return (0); 9077c478bd9Sstevel@tonic-gate } 9087c478bd9Sstevel@tonic-gate 9097c478bd9Sstevel@tonic-gate VN_RELE(cmpvp); 910fa9e4066Sahrens } else if (error != ENOENT) { 911fa9e4066Sahrens return (error); 9127c478bd9Sstevel@tonic-gate } 9137c478bd9Sstevel@tonic-gate 9147c478bd9Sstevel@tonic-gate dp = (dirent64_t *)((intptr_t)dp + dp->d_reclen); 9157c478bd9Sstevel@tonic-gate } 9167c478bd9Sstevel@tonic-gate } 9177c478bd9Sstevel@tonic-gate 9187c478bd9Sstevel@tonic-gate /* 9197c478bd9Sstevel@tonic-gate * Something strange has happened, this directory does not contain the 9207c478bd9Sstevel@tonic-gate * specified vnode. This should never happen in the normal case, since 921fa9e4066Sahrens * we ensured that dvp is the parent of vp. This is possible in some 922fa9e4066Sahrens * rare conditions (races and the special .zfs directory). 9237c478bd9Sstevel@tonic-gate */ 924fa9e4066Sahrens if (error == 0) { 925da6c28aaSamw error = VOP_LOOKUP(dvp, ".zfs", &cmpvp, &pnp, 0, vrootp, cr, 926da6c28aaSamw NULL, NULL, NULL); 927fa9e4066Sahrens if (error == 0) { 928fa9e4066Sahrens if (vnode_match(tvp, cmpvp, cr)) { 929fa9e4066Sahrens (void) strcpy(dp->d_name, ".zfs"); 930fa9e4066Sahrens dp->d_reclen = strlen(".zfs"); 931fa9e4066Sahrens dp->d_off = 2; 932fa9e4066Sahrens dp->d_ino = 1; 933fa9e4066Sahrens *rdp = dp; 934fa9e4066Sahrens } else { 935fa9e4066Sahrens error = ENOENT; 936fa9e4066Sahrens } 937fa9e4066Sahrens VN_RELE(cmpvp); 938fa9e4066Sahrens } 939fa9e4066Sahrens } 9407c478bd9Sstevel@tonic-gate 941fa9e4066Sahrens return (error); 9427c478bd9Sstevel@tonic-gate } 9437c478bd9Sstevel@tonic-gate 9447c478bd9Sstevel@tonic-gate /* 9457c478bd9Sstevel@tonic-gate * Given a global path (from rootdir), and a vnode that is the current root, 9467c478bd9Sstevel@tonic-gate * return the portion of the path that is beneath the current root or NULL on 9477c478bd9Sstevel@tonic-gate * failure. The path MUST be a resolved path (no '..' entries or symlinks), 9487c478bd9Sstevel@tonic-gate * otherwise this function will fail. 9497c478bd9Sstevel@tonic-gate */ 9507c478bd9Sstevel@tonic-gate static char * 9517c478bd9Sstevel@tonic-gate localpath(char *path, struct vnode *vrootp, cred_t *cr) 9527c478bd9Sstevel@tonic-gate { 9537c478bd9Sstevel@tonic-gate vnode_t *vp; 9547c478bd9Sstevel@tonic-gate vnode_t *cvp; 9557c478bd9Sstevel@tonic-gate char component[MAXNAMELEN]; 9567c478bd9Sstevel@tonic-gate char *ret = NULL; 9577c478bd9Sstevel@tonic-gate pathname_t pn; 9587c478bd9Sstevel@tonic-gate 9597c478bd9Sstevel@tonic-gate /* 9607c478bd9Sstevel@tonic-gate * We use vn_compare() instead of VN_CMP() in order to detect lofs 9617c478bd9Sstevel@tonic-gate * mounts and stacked vnodes. 9627c478bd9Sstevel@tonic-gate */ 9637c478bd9Sstevel@tonic-gate if (vn_compare(vrootp, rootdir)) 9647c478bd9Sstevel@tonic-gate return (path); 9657c478bd9Sstevel@tonic-gate 9667c478bd9Sstevel@tonic-gate if (pn_get(path, UIO_SYSSPACE, &pn) != 0) 9677c478bd9Sstevel@tonic-gate return (NULL); 9687c478bd9Sstevel@tonic-gate 9697c478bd9Sstevel@tonic-gate vp = rootdir; 9707c478bd9Sstevel@tonic-gate VN_HOLD(vp); 9717c478bd9Sstevel@tonic-gate 9725fd6860bSMilan Cermak if (vn_ismntpt(vp) && traverse(&vp) != 0) { 9735fd6860bSMilan Cermak VN_RELE(vp); 9745fd6860bSMilan Cermak pn_free(&pn); 9755fd6860bSMilan Cermak return (NULL); 9765fd6860bSMilan Cermak } 9775fd6860bSMilan Cermak 9787c478bd9Sstevel@tonic-gate while (pn_pathleft(&pn)) { 9797c478bd9Sstevel@tonic-gate pn_skipslash(&pn); 9807c478bd9Sstevel@tonic-gate 9817c478bd9Sstevel@tonic-gate if (pn_getcomponent(&pn, component) != 0) 9827c478bd9Sstevel@tonic-gate break; 9837c478bd9Sstevel@tonic-gate 984da6c28aaSamw if (VOP_LOOKUP(vp, component, &cvp, &pn, 0, rootdir, cr, 985da6c28aaSamw NULL, NULL, NULL) != 0) 9867c478bd9Sstevel@tonic-gate break; 9877c478bd9Sstevel@tonic-gate VN_RELE(vp); 9887c478bd9Sstevel@tonic-gate vp = cvp; 9897c478bd9Sstevel@tonic-gate 9905fd6860bSMilan Cermak if (vn_ismntpt(vp) && traverse(&vp) != 0) 9915fd6860bSMilan Cermak break; 9925fd6860bSMilan Cermak 9937c478bd9Sstevel@tonic-gate if (vn_compare(vp, vrootp)) { 9947c478bd9Sstevel@tonic-gate ret = path + (pn.pn_path - pn.pn_buf); 9957c478bd9Sstevel@tonic-gate break; 9967c478bd9Sstevel@tonic-gate } 9977c478bd9Sstevel@tonic-gate } 9987c478bd9Sstevel@tonic-gate 9997c478bd9Sstevel@tonic-gate VN_RELE(vp); 10007c478bd9Sstevel@tonic-gate pn_free(&pn); 10017c478bd9Sstevel@tonic-gate 10027c478bd9Sstevel@tonic-gate return (ret); 10037c478bd9Sstevel@tonic-gate } 10047c478bd9Sstevel@tonic-gate 10057c478bd9Sstevel@tonic-gate /* 10067c478bd9Sstevel@tonic-gate * Given a directory, return the full, resolved path. This looks up "..", 10077c478bd9Sstevel@tonic-gate * searches for the given vnode in the parent, appends the component, etc. It 10087c478bd9Sstevel@tonic-gate * is used to implement vnodetopath() and getcwd() when the cached path fails 10097c478bd9Sstevel@tonic-gate * (or vfs_vnode_path is not set). 10107c478bd9Sstevel@tonic-gate */ 10117c478bd9Sstevel@tonic-gate static int 10127c478bd9Sstevel@tonic-gate dirtopath(vnode_t *vrootp, vnode_t *vp, char *buf, size_t buflen, cred_t *cr) 10137c478bd9Sstevel@tonic-gate { 10147c478bd9Sstevel@tonic-gate pathname_t pn, rpn, emptypn; 10157c478bd9Sstevel@tonic-gate vnode_t *cmpvp, *pvp = NULL; 10167c478bd9Sstevel@tonic-gate vnode_t *startvp = vp; 10177c478bd9Sstevel@tonic-gate int err = 0; 10187c478bd9Sstevel@tonic-gate size_t complen; 10197c478bd9Sstevel@tonic-gate char *dbuf; 10207c478bd9Sstevel@tonic-gate dirent64_t *dp; 10217c478bd9Sstevel@tonic-gate char *bufloc; 10227c478bd9Sstevel@tonic-gate size_t dlen = DIRENT64_RECLEN(MAXPATHLEN); 10237c478bd9Sstevel@tonic-gate refstr_t *mntpt; 10247c478bd9Sstevel@tonic-gate 10257c478bd9Sstevel@tonic-gate /* Operation only allowed on directories */ 10267c478bd9Sstevel@tonic-gate ASSERT(vp->v_type == VDIR); 10277c478bd9Sstevel@tonic-gate 10287c478bd9Sstevel@tonic-gate /* We must have at least enough space for "/" */ 10297c478bd9Sstevel@tonic-gate if (buflen < 2) 10307c478bd9Sstevel@tonic-gate return (ENAMETOOLONG); 10317c478bd9Sstevel@tonic-gate 10327c478bd9Sstevel@tonic-gate /* Start at end of string with terminating null */ 10337c478bd9Sstevel@tonic-gate bufloc = &buf[buflen - 1]; 10347c478bd9Sstevel@tonic-gate *bufloc = '\0'; 10357c478bd9Sstevel@tonic-gate 10367c478bd9Sstevel@tonic-gate pn_alloc(&pn); 10377c478bd9Sstevel@tonic-gate pn_alloc(&rpn); 10387c478bd9Sstevel@tonic-gate dbuf = kmem_alloc(dlen, KM_SLEEP); 10397c478bd9Sstevel@tonic-gate bzero(&emptypn, sizeof (emptypn)); 10407c478bd9Sstevel@tonic-gate 10417c478bd9Sstevel@tonic-gate /* 10427c478bd9Sstevel@tonic-gate * Begin with an additional reference on vp. This will be decremented 10437c478bd9Sstevel@tonic-gate * during the loop. 10447c478bd9Sstevel@tonic-gate */ 10457c478bd9Sstevel@tonic-gate VN_HOLD(vp); 10467c478bd9Sstevel@tonic-gate 10477c478bd9Sstevel@tonic-gate for (;;) { 10487c478bd9Sstevel@tonic-gate /* 10497c478bd9Sstevel@tonic-gate * Return if we've reached the root. If the buffer is empty, 10507c478bd9Sstevel@tonic-gate * return '/'. We explicitly don't use vn_compare(), since it 10517c478bd9Sstevel@tonic-gate * compares the real vnodes. A lofs mount of '/' would produce 10527c478bd9Sstevel@tonic-gate * incorrect results otherwise. 10537c478bd9Sstevel@tonic-gate */ 10547c478bd9Sstevel@tonic-gate if (VN_CMP(vrootp, vp)) { 10557c478bd9Sstevel@tonic-gate if (*bufloc == '\0') 10567c478bd9Sstevel@tonic-gate *--bufloc = '/'; 10577c478bd9Sstevel@tonic-gate break; 10587c478bd9Sstevel@tonic-gate } 10597c478bd9Sstevel@tonic-gate 10607c478bd9Sstevel@tonic-gate /* 10617c478bd9Sstevel@tonic-gate * If we've reached the VFS root, something has gone wrong. We 10627c478bd9Sstevel@tonic-gate * should have reached the root in the above check. The only 10637c478bd9Sstevel@tonic-gate * explantation is that 'vp' is not contained withing the given 10647c478bd9Sstevel@tonic-gate * root, in which case we return EPERM. 10657c478bd9Sstevel@tonic-gate */ 10667c478bd9Sstevel@tonic-gate if (VN_CMP(rootdir, vp)) { 10677c478bd9Sstevel@tonic-gate err = EPERM; 10687c478bd9Sstevel@tonic-gate goto out; 10697c478bd9Sstevel@tonic-gate } 10707c478bd9Sstevel@tonic-gate 10717c478bd9Sstevel@tonic-gate /* 10727c478bd9Sstevel@tonic-gate * Shortcut: see if this vnode is a mountpoint. If so, 10737c478bd9Sstevel@tonic-gate * grab the path information from the vfs_t. 10747c478bd9Sstevel@tonic-gate */ 10757c478bd9Sstevel@tonic-gate if (vp->v_flag & VROOT) { 10767c478bd9Sstevel@tonic-gate 10777c478bd9Sstevel@tonic-gate mntpt = vfs_getmntpoint(vp->v_vfsp); 10787c478bd9Sstevel@tonic-gate if ((err = pn_set(&pn, (char *)refstr_value(mntpt))) 10797c478bd9Sstevel@tonic-gate == 0) { 10807c478bd9Sstevel@tonic-gate refstr_rele(mntpt); 10817c478bd9Sstevel@tonic-gate rpn.pn_path = rpn.pn_buf; 10827c478bd9Sstevel@tonic-gate 10837c478bd9Sstevel@tonic-gate /* 1084207983b5SMilan Cermak * Ensure the mountpoint still exists. 10857c478bd9Sstevel@tonic-gate */ 10867c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 10877c478bd9Sstevel@tonic-gate if (vrootp != rootdir) 10887c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 10897c478bd9Sstevel@tonic-gate if (lookuppnvp(&pn, &rpn, 0, NULL, 10907c478bd9Sstevel@tonic-gate &cmpvp, vrootp, vrootp, cr) == 0) { 10917c478bd9Sstevel@tonic-gate 10927c478bd9Sstevel@tonic-gate if (VN_CMP(vp, cmpvp)) { 10937c478bd9Sstevel@tonic-gate VN_RELE(cmpvp); 10947c478bd9Sstevel@tonic-gate 10957c478bd9Sstevel@tonic-gate complen = strlen(rpn.pn_path); 10967c478bd9Sstevel@tonic-gate bufloc -= complen; 10977c478bd9Sstevel@tonic-gate if (bufloc < buf) { 10987c478bd9Sstevel@tonic-gate err = ERANGE; 10997c478bd9Sstevel@tonic-gate goto out; 11007c478bd9Sstevel@tonic-gate } 11017c478bd9Sstevel@tonic-gate bcopy(rpn.pn_path, bufloc, 11027c478bd9Sstevel@tonic-gate complen); 11037c478bd9Sstevel@tonic-gate break; 11047c478bd9Sstevel@tonic-gate } else { 11057c478bd9Sstevel@tonic-gate VN_RELE(cmpvp); 11067c478bd9Sstevel@tonic-gate } 11077c478bd9Sstevel@tonic-gate } 11087c478bd9Sstevel@tonic-gate } else { 11097c478bd9Sstevel@tonic-gate refstr_rele(mntpt); 11107c478bd9Sstevel@tonic-gate } 11117c478bd9Sstevel@tonic-gate } 11127c478bd9Sstevel@tonic-gate 1113207983b5SMilan Cermak /* 1114207983b5SMilan Cermak * Shortcut: see if this vnode has correct v_path. If so, 1115207983b5SMilan Cermak * we have the work done. 1116207983b5SMilan Cermak */ 1117207983b5SMilan Cermak mutex_enter(&vp->v_lock); 1118207983b5SMilan Cermak if (vp->v_path != NULL) { 1119207983b5SMilan Cermak 1120207983b5SMilan Cermak if ((err = pn_set(&pn, vp->v_path)) == 0) { 1121207983b5SMilan Cermak mutex_exit(&vp->v_lock); 1122207983b5SMilan Cermak rpn.pn_path = rpn.pn_buf; 1123207983b5SMilan Cermak 1124207983b5SMilan Cermak /* 1125207983b5SMilan Cermak * Ensure the v_path pointing to correct vnode 1126207983b5SMilan Cermak */ 1127207983b5SMilan Cermak VN_HOLD(vrootp); 1128207983b5SMilan Cermak if (vrootp != rootdir) 1129207983b5SMilan Cermak VN_HOLD(vrootp); 1130207983b5SMilan Cermak if (lookuppnvp(&pn, &rpn, 0, NULL, 1131207983b5SMilan Cermak &cmpvp, vrootp, vrootp, cr) == 0) { 1132207983b5SMilan Cermak 1133207983b5SMilan Cermak if (VN_CMP(vp, cmpvp)) { 1134207983b5SMilan Cermak VN_RELE(cmpvp); 1135207983b5SMilan Cermak 1136207983b5SMilan Cermak complen = strlen(rpn.pn_path); 1137207983b5SMilan Cermak bufloc -= complen; 1138207983b5SMilan Cermak if (bufloc < buf) { 1139207983b5SMilan Cermak err = ERANGE; 1140207983b5SMilan Cermak goto out; 1141207983b5SMilan Cermak } 1142207983b5SMilan Cermak bcopy(rpn.pn_path, bufloc, 1143207983b5SMilan Cermak complen); 1144207983b5SMilan Cermak break; 1145207983b5SMilan Cermak } else { 1146207983b5SMilan Cermak VN_RELE(cmpvp); 1147207983b5SMilan Cermak } 1148207983b5SMilan Cermak } 1149207983b5SMilan Cermak } else { 1150207983b5SMilan Cermak mutex_exit(&vp->v_lock); 1151207983b5SMilan Cermak } 1152207983b5SMilan Cermak } else { 1153207983b5SMilan Cermak mutex_exit(&vp->v_lock); 1154207983b5SMilan Cermak } 1155207983b5SMilan Cermak 11567c478bd9Sstevel@tonic-gate /* 11577c478bd9Sstevel@tonic-gate * Shortcuts failed, search for this vnode in its parent. If 11587c478bd9Sstevel@tonic-gate * this is a mountpoint, then get the vnode underneath. 11597c478bd9Sstevel@tonic-gate */ 11607c478bd9Sstevel@tonic-gate if (vp->v_flag & VROOT) 11617c478bd9Sstevel@tonic-gate vp = vn_under(vp); 1162da6c28aaSamw if ((err = VOP_LOOKUP(vp, "..", &pvp, &emptypn, 0, vrootp, cr, 1163da6c28aaSamw NULL, NULL, NULL)) != 0) 11647c478bd9Sstevel@tonic-gate goto out; 11657c478bd9Sstevel@tonic-gate 11667c478bd9Sstevel@tonic-gate /* 11677c478bd9Sstevel@tonic-gate * With extended attributes, it's possible for a directory to 11687c478bd9Sstevel@tonic-gate * have a parent that is a regular file. Check for that here. 11697c478bd9Sstevel@tonic-gate */ 11707c478bd9Sstevel@tonic-gate if (pvp->v_type != VDIR) { 11717c478bd9Sstevel@tonic-gate err = ENOTDIR; 11727c478bd9Sstevel@tonic-gate goto out; 11737c478bd9Sstevel@tonic-gate } 11747c478bd9Sstevel@tonic-gate 11757c478bd9Sstevel@tonic-gate /* 11767c478bd9Sstevel@tonic-gate * If this is true, something strange has happened. This is 11777c478bd9Sstevel@tonic-gate * only true if we are the root of a filesystem, which should 11787c478bd9Sstevel@tonic-gate * have been caught by the check above. 11797c478bd9Sstevel@tonic-gate */ 11807c478bd9Sstevel@tonic-gate if (VN_CMP(pvp, vp)) { 11817c478bd9Sstevel@tonic-gate err = ENOENT; 11827c478bd9Sstevel@tonic-gate goto out; 11837c478bd9Sstevel@tonic-gate } 11847c478bd9Sstevel@tonic-gate 1185207983b5SMilan Cermak /* 1186207983b5SMilan Cermak * Try to obtain the path component from dnlc cache 1187207983b5SMilan Cermak * before searching through the directory. 1188207983b5SMilan Cermak */ 1189207983b5SMilan Cermak if ((cmpvp = dnlc_reverse_lookup(vp, dbuf, dlen)) != NULL) { 1190207983b5SMilan Cermak /* 1191207983b5SMilan Cermak * If we got parent vnode as a result, 1192207983b5SMilan Cermak * then the answered path is correct. 1193207983b5SMilan Cermak */ 1194207983b5SMilan Cermak if (VN_CMP(cmpvp, pvp)) { 1195207983b5SMilan Cermak VN_RELE(cmpvp); 1196207983b5SMilan Cermak complen = strlen(dbuf); 1197207983b5SMilan Cermak bufloc -= complen; 1198207983b5SMilan Cermak if (bufloc <= buf) { 1199207983b5SMilan Cermak err = ENAMETOOLONG; 1200207983b5SMilan Cermak goto out; 1201207983b5SMilan Cermak } 1202207983b5SMilan Cermak bcopy(dbuf, bufloc, complen); 1203207983b5SMilan Cermak 1204207983b5SMilan Cermak /* Prepend a slash to the current path */ 1205207983b5SMilan Cermak *--bufloc = '/'; 1206207983b5SMilan Cermak 1207207983b5SMilan Cermak /* And continue with the next component */ 1208207983b5SMilan Cermak VN_RELE(vp); 1209207983b5SMilan Cermak vp = pvp; 1210207983b5SMilan Cermak pvp = NULL; 1211207983b5SMilan Cermak continue; 1212207983b5SMilan Cermak } else { 1213207983b5SMilan Cermak VN_RELE(cmpvp); 1214207983b5SMilan Cermak } 1215207983b5SMilan Cermak } 1216207983b5SMilan Cermak 12177c478bd9Sstevel@tonic-gate /* 12187c478bd9Sstevel@tonic-gate * Search the parent directory for the entry corresponding to 12197c478bd9Sstevel@tonic-gate * this vnode. 12207c478bd9Sstevel@tonic-gate */ 12217c478bd9Sstevel@tonic-gate if ((err = dirfindvp(vrootp, pvp, vp, cr, dbuf, dlen, &dp)) 12227c478bd9Sstevel@tonic-gate != 0) 12237c478bd9Sstevel@tonic-gate goto out; 12247c478bd9Sstevel@tonic-gate complen = strlen(dp->d_name); 12257c478bd9Sstevel@tonic-gate bufloc -= complen; 12267c478bd9Sstevel@tonic-gate if (bufloc <= buf) { 12277c478bd9Sstevel@tonic-gate err = ENAMETOOLONG; 12287c478bd9Sstevel@tonic-gate goto out; 12297c478bd9Sstevel@tonic-gate } 12307c478bd9Sstevel@tonic-gate bcopy(dp->d_name, bufloc, complen); 12317c478bd9Sstevel@tonic-gate 12327c478bd9Sstevel@tonic-gate /* Prepend a slash to the current path. */ 12337c478bd9Sstevel@tonic-gate *--bufloc = '/'; 12347c478bd9Sstevel@tonic-gate 12357c478bd9Sstevel@tonic-gate /* And continue with the next component */ 12367c478bd9Sstevel@tonic-gate VN_RELE(vp); 12377c478bd9Sstevel@tonic-gate vp = pvp; 12387c478bd9Sstevel@tonic-gate pvp = NULL; 12397c478bd9Sstevel@tonic-gate } 12407c478bd9Sstevel@tonic-gate 12417c478bd9Sstevel@tonic-gate /* 12427c478bd9Sstevel@tonic-gate * Place the path at the beginning of the buffer. 12437c478bd9Sstevel@tonic-gate */ 12447c478bd9Sstevel@tonic-gate if (bufloc != buf) 12457c478bd9Sstevel@tonic-gate ovbcopy(bufloc, buf, buflen - (bufloc - buf)); 12467c478bd9Sstevel@tonic-gate 1247207983b5SMilan Cermak /* 1248207983b5SMilan Cermak * We got here because of invalid v_path in startvp. 1249207983b5SMilan Cermak * Now, we have all info to fix it. 1250207983b5SMilan Cermak * Path must not include leading slash to let vn_renamepath 1251207983b5SMilan Cermak * pre-attach chroot'd root directory path. Also, trailing '\0' 1252207983b5SMilan Cermak * is not counted to length. 1253207983b5SMilan Cermak */ 1254207983b5SMilan Cermak vn_renamepath(vrootp, startvp, &buf[1], buflen - (bufloc - buf) - 2); 1255207983b5SMilan Cermak 12567c478bd9Sstevel@tonic-gate out: 12577c478bd9Sstevel@tonic-gate /* 12587c478bd9Sstevel@tonic-gate * If the error was ESTALE and the current directory to look in 12597c478bd9Sstevel@tonic-gate * was the root for this lookup, the root for a mounted file 12607c478bd9Sstevel@tonic-gate * system, or the starting directory for lookups, then 12617c478bd9Sstevel@tonic-gate * return ENOENT instead of ESTALE. In this case, no recovery 12627c478bd9Sstevel@tonic-gate * is possible by the higher level. If ESTALE was returned for 12637c478bd9Sstevel@tonic-gate * some intermediate directory along the path, then recovery 12647c478bd9Sstevel@tonic-gate * is potentially possible and retrying from the higher level 12657c478bd9Sstevel@tonic-gate * will either correct the situation by purging stale cache 12667c478bd9Sstevel@tonic-gate * entries or eventually get back to the point where no recovery 12677c478bd9Sstevel@tonic-gate * is possible. 12687c478bd9Sstevel@tonic-gate */ 12697c478bd9Sstevel@tonic-gate if (err == ESTALE && 12707c478bd9Sstevel@tonic-gate (VN_CMP(vp, vrootp) || (vp->v_flag & VROOT) || vp == startvp)) 12717c478bd9Sstevel@tonic-gate err = ENOENT; 12727c478bd9Sstevel@tonic-gate 12737c478bd9Sstevel@tonic-gate kmem_free(dbuf, dlen); 12747c478bd9Sstevel@tonic-gate VN_RELE(vp); 12757c478bd9Sstevel@tonic-gate if (pvp) 12767c478bd9Sstevel@tonic-gate VN_RELE(pvp); 12777c478bd9Sstevel@tonic-gate pn_free(&pn); 12787c478bd9Sstevel@tonic-gate pn_free(&rpn); 12797c478bd9Sstevel@tonic-gate 12807c478bd9Sstevel@tonic-gate return (err); 12817c478bd9Sstevel@tonic-gate } 12827c478bd9Sstevel@tonic-gate 12837c478bd9Sstevel@tonic-gate /* 1284207983b5SMilan Cermak * The additional flag, LOOKUP_CHECKREAD, is used to enforce artificial 12857c478bd9Sstevel@tonic-gate * constraints in order to be standards compliant. For example, if we have 12867c478bd9Sstevel@tonic-gate * the cached path of '/foo/bar', and '/foo' has permissions 100 (execute 12877c478bd9Sstevel@tonic-gate * only), then we can legitimately look up the path to the current working 12887c478bd9Sstevel@tonic-gate * directory without needing read permission. Existing standards tests, 12897c478bd9Sstevel@tonic-gate * however, assume that we are determining the path by repeatedly looking up 12907c478bd9Sstevel@tonic-gate * "..". We need to keep this behavior in order to maintain backwards 12917c478bd9Sstevel@tonic-gate * compatibility. 12927c478bd9Sstevel@tonic-gate */ 12937c478bd9Sstevel@tonic-gate static int 12947c478bd9Sstevel@tonic-gate vnodetopath_common(vnode_t *vrootp, vnode_t *vp, char *buf, size_t buflen, 12957c478bd9Sstevel@tonic-gate cred_t *cr, int flags) 12967c478bd9Sstevel@tonic-gate { 12977c478bd9Sstevel@tonic-gate pathname_t pn, rpn; 12987c478bd9Sstevel@tonic-gate int ret, len; 12997c478bd9Sstevel@tonic-gate vnode_t *compvp, *pvp, *realvp; 13007c478bd9Sstevel@tonic-gate proc_t *p = curproc; 13017c478bd9Sstevel@tonic-gate char path[MAXNAMELEN]; 13027c478bd9Sstevel@tonic-gate int doclose = 0; 13037c478bd9Sstevel@tonic-gate 13047c478bd9Sstevel@tonic-gate /* 13057c478bd9Sstevel@tonic-gate * If vrootp is NULL, get the root for curproc. Callers with any other 13067c478bd9Sstevel@tonic-gate * requirements should pass in a different vrootp. 13077c478bd9Sstevel@tonic-gate */ 13087c478bd9Sstevel@tonic-gate if (vrootp == NULL) { 13097c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 13107c478bd9Sstevel@tonic-gate if ((vrootp = PTOU(p)->u_rdir) == NULL) 13117c478bd9Sstevel@tonic-gate vrootp = rootdir; 13127c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 13137c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 13147c478bd9Sstevel@tonic-gate } else { 13157c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 13167c478bd9Sstevel@tonic-gate } 13177c478bd9Sstevel@tonic-gate 13187c478bd9Sstevel@tonic-gate /* 13197c478bd9Sstevel@tonic-gate * This is to get around an annoying artifact of the /proc filesystem, 13207c478bd9Sstevel@tonic-gate * which is the behavior of {cwd/root}. Trying to resolve this path 13217c478bd9Sstevel@tonic-gate * will result in /proc/pid/cwd instead of whatever the real working 13227c478bd9Sstevel@tonic-gate * directory is. We can't rely on VOP_REALVP(), since that will break 13237c478bd9Sstevel@tonic-gate * lofs. The only difference between procfs and lofs is that opening 13247c478bd9Sstevel@tonic-gate * the file will return the underling vnode in the case of procfs. 13257c478bd9Sstevel@tonic-gate */ 1326da6c28aaSamw if (vp->v_type == VDIR && VOP_REALVP(vp, &realvp, NULL) == 0 && 13277c478bd9Sstevel@tonic-gate realvp != vp) { 13287c478bd9Sstevel@tonic-gate VN_HOLD(vp); 1329da6c28aaSamw if (VOP_OPEN(&vp, FREAD, cr, NULL) == 0) 13307c478bd9Sstevel@tonic-gate doclose = 1; 13317c478bd9Sstevel@tonic-gate else 13327c478bd9Sstevel@tonic-gate VN_RELE(vp); 13337c478bd9Sstevel@tonic-gate } 13347c478bd9Sstevel@tonic-gate 13357c478bd9Sstevel@tonic-gate pn_alloc(&pn); 13367c478bd9Sstevel@tonic-gate 13377c478bd9Sstevel@tonic-gate /* 13387c478bd9Sstevel@tonic-gate * Check to see if we have a cached path in the vnode. 13397c478bd9Sstevel@tonic-gate */ 13407c478bd9Sstevel@tonic-gate mutex_enter(&vp->v_lock); 1341ca2c3138Seschrock if (vp->v_path != NULL) { 1342ca2c3138Seschrock (void) pn_set(&pn, vp->v_path); 13437c478bd9Sstevel@tonic-gate mutex_exit(&vp->v_lock); 13447c478bd9Sstevel@tonic-gate 13457c478bd9Sstevel@tonic-gate pn_alloc(&rpn); 13467c478bd9Sstevel@tonic-gate 13477c478bd9Sstevel@tonic-gate /* We should only cache absolute paths */ 13487c478bd9Sstevel@tonic-gate ASSERT(pn.pn_buf[0] == '/'); 13497c478bd9Sstevel@tonic-gate 13507c478bd9Sstevel@tonic-gate /* 13517c478bd9Sstevel@tonic-gate * If we are in a zone or a chroot environment, then we have to 13527c478bd9Sstevel@tonic-gate * take additional steps, since the path to the root might not 13537c478bd9Sstevel@tonic-gate * be readable with the current credentials, even though the 13547c478bd9Sstevel@tonic-gate * process can legitmately access the file. In this case, we 13557c478bd9Sstevel@tonic-gate * do the following: 13567c478bd9Sstevel@tonic-gate * 13577c478bd9Sstevel@tonic-gate * lookuppnvp() with all privileges to get the resolved path. 13587c478bd9Sstevel@tonic-gate * call localpath() to get the local portion of the path, and 13597c478bd9Sstevel@tonic-gate * continue as normal. 13607c478bd9Sstevel@tonic-gate * 13617c478bd9Sstevel@tonic-gate * If the the conversion to a local path fails, then we continue 13627c478bd9Sstevel@tonic-gate * as normal. This is a heuristic to make process object file 13637c478bd9Sstevel@tonic-gate * paths available from within a zone. Because lofs doesn't 13647c478bd9Sstevel@tonic-gate * support page operations, the vnode stored in the seg_t is 13657c478bd9Sstevel@tonic-gate * actually the underlying real vnode, not the lofs node itself. 13667c478bd9Sstevel@tonic-gate * Most of the time, the lofs path is the same as the underlying 13677c478bd9Sstevel@tonic-gate * vnode (for example, /usr/lib/libc.so.1). 13687c478bd9Sstevel@tonic-gate */ 13697c478bd9Sstevel@tonic-gate if (vrootp != rootdir) { 13707c478bd9Sstevel@tonic-gate char *local = NULL; 13717c478bd9Sstevel@tonic-gate VN_HOLD(rootdir); 13727c478bd9Sstevel@tonic-gate if (lookuppnvp(&pn, &rpn, FOLLOW, 13737c478bd9Sstevel@tonic-gate NULL, &compvp, rootdir, rootdir, kcred) == 0) { 13747c478bd9Sstevel@tonic-gate local = localpath(rpn.pn_path, vrootp, 13757c478bd9Sstevel@tonic-gate kcred); 13767c478bd9Sstevel@tonic-gate VN_RELE(compvp); 13777c478bd9Sstevel@tonic-gate } 13787c478bd9Sstevel@tonic-gate 13797c478bd9Sstevel@tonic-gate /* 1380207983b5SMilan Cermak * The original pn was changed through lookuppnvp(). 1381207983b5SMilan Cermak * Set it to local for next validation attempt. 13827c478bd9Sstevel@tonic-gate */ 13837c478bd9Sstevel@tonic-gate if (local) { 13847c478bd9Sstevel@tonic-gate (void) pn_set(&pn, local); 13857c478bd9Sstevel@tonic-gate } else { 1386207983b5SMilan Cermak goto notcached; 13877c478bd9Sstevel@tonic-gate } 13887c478bd9Sstevel@tonic-gate } 13897c478bd9Sstevel@tonic-gate 13907c478bd9Sstevel@tonic-gate /* 13917c478bd9Sstevel@tonic-gate * We should have a local path at this point, so start the 13927c478bd9Sstevel@tonic-gate * search from the root of the current process. 13937c478bd9Sstevel@tonic-gate */ 13947c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 13957c478bd9Sstevel@tonic-gate if (vrootp != rootdir) 13967c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 13977c478bd9Sstevel@tonic-gate ret = lookuppnvp(&pn, &rpn, FOLLOW | flags, NULL, 13987c478bd9Sstevel@tonic-gate &compvp, vrootp, vrootp, cr); 13997c478bd9Sstevel@tonic-gate if (ret == 0) { 14007c478bd9Sstevel@tonic-gate /* 14017c478bd9Sstevel@tonic-gate * Check to see if the returned vnode is the same as 14027c478bd9Sstevel@tonic-gate * the one we expect. If not, give up. 14037c478bd9Sstevel@tonic-gate */ 14047c478bd9Sstevel@tonic-gate if (!vn_compare(vp, compvp) && 14057c478bd9Sstevel@tonic-gate !vnode_match(vp, compvp, cr)) { 14067c478bd9Sstevel@tonic-gate VN_RELE(compvp); 14077c478bd9Sstevel@tonic-gate goto notcached; 14087c478bd9Sstevel@tonic-gate } 14097c478bd9Sstevel@tonic-gate 14107c478bd9Sstevel@tonic-gate VN_RELE(compvp); 14117c478bd9Sstevel@tonic-gate 14127c478bd9Sstevel@tonic-gate /* 14137c478bd9Sstevel@tonic-gate * Return the result. 14147c478bd9Sstevel@tonic-gate */ 14157c478bd9Sstevel@tonic-gate if (buflen <= rpn.pn_pathlen) 14167c478bd9Sstevel@tonic-gate goto notcached; 14177c478bd9Sstevel@tonic-gate 14187c478bd9Sstevel@tonic-gate bcopy(rpn.pn_path, buf, rpn.pn_pathlen + 1); 14197c478bd9Sstevel@tonic-gate pn_free(&pn); 14207c478bd9Sstevel@tonic-gate pn_free(&rpn); 14217c478bd9Sstevel@tonic-gate VN_RELE(vrootp); 14227c478bd9Sstevel@tonic-gate if (doclose) { 1423da6c28aaSamw (void) VOP_CLOSE(vp, FREAD, 1, 0, cr, NULL); 14247c478bd9Sstevel@tonic-gate VN_RELE(vp); 14257c478bd9Sstevel@tonic-gate } 14267c478bd9Sstevel@tonic-gate return (0); 14277c478bd9Sstevel@tonic-gate } 14287c478bd9Sstevel@tonic-gate 14297c478bd9Sstevel@tonic-gate notcached: 14307c478bd9Sstevel@tonic-gate pn_free(&rpn); 14317c478bd9Sstevel@tonic-gate } else { 14327c478bd9Sstevel@tonic-gate mutex_exit(&vp->v_lock); 14337c478bd9Sstevel@tonic-gate } 14347c478bd9Sstevel@tonic-gate 14357c478bd9Sstevel@tonic-gate pn_free(&pn); 14367c478bd9Sstevel@tonic-gate 14377c478bd9Sstevel@tonic-gate if (vp->v_type != VDIR) { 14387c478bd9Sstevel@tonic-gate /* 14397c478bd9Sstevel@tonic-gate * If we don't have a directory, try to find it in the dnlc via 14407c478bd9Sstevel@tonic-gate * reverse lookup. Once this is found, we can use the regular 14417c478bd9Sstevel@tonic-gate * directory search to find the full path. 14427c478bd9Sstevel@tonic-gate */ 14437c478bd9Sstevel@tonic-gate if ((pvp = dnlc_reverse_lookup(vp, path, MAXNAMELEN)) != NULL) { 14447c478bd9Sstevel@tonic-gate ret = dirtopath(vrootp, pvp, buf, buflen, cr); 14457c478bd9Sstevel@tonic-gate if (ret == 0) { 14467c478bd9Sstevel@tonic-gate len = strlen(buf); 14477c478bd9Sstevel@tonic-gate if (len + strlen(path) + 1 >= buflen) { 14487c478bd9Sstevel@tonic-gate ret = ENAMETOOLONG; 14497c478bd9Sstevel@tonic-gate } else { 14507c478bd9Sstevel@tonic-gate if (buf[len - 1] != '/') 14517c478bd9Sstevel@tonic-gate buf[len++] = '/'; 14527c478bd9Sstevel@tonic-gate bcopy(path, buf + len, 14537c478bd9Sstevel@tonic-gate strlen(path) + 1); 14547c478bd9Sstevel@tonic-gate } 14557c478bd9Sstevel@tonic-gate } 14567c478bd9Sstevel@tonic-gate 14577c478bd9Sstevel@tonic-gate VN_RELE(pvp); 14587c478bd9Sstevel@tonic-gate } else 14597c478bd9Sstevel@tonic-gate ret = ENOENT; 14607c478bd9Sstevel@tonic-gate } else 14617c478bd9Sstevel@tonic-gate ret = dirtopath(vrootp, vp, buf, buflen, cr); 14627c478bd9Sstevel@tonic-gate 14637c478bd9Sstevel@tonic-gate VN_RELE(vrootp); 14647c478bd9Sstevel@tonic-gate if (doclose) { 1465da6c28aaSamw (void) VOP_CLOSE(vp, FREAD, 1, 0, cr, NULL); 14667c478bd9Sstevel@tonic-gate VN_RELE(vp); 14677c478bd9Sstevel@tonic-gate } 14687c478bd9Sstevel@tonic-gate 14697c478bd9Sstevel@tonic-gate return (ret); 14707c478bd9Sstevel@tonic-gate } 14717c478bd9Sstevel@tonic-gate 14727c478bd9Sstevel@tonic-gate int 14737c478bd9Sstevel@tonic-gate vnodetopath(vnode_t *vrootp, vnode_t *vp, char *buf, size_t buflen, cred_t *cr) 14747c478bd9Sstevel@tonic-gate { 14757c478bd9Sstevel@tonic-gate return (vnodetopath_common(vrootp, vp, buf, buflen, cr, 0)); 14767c478bd9Sstevel@tonic-gate } 14777c478bd9Sstevel@tonic-gate 14787c478bd9Sstevel@tonic-gate int 14797c478bd9Sstevel@tonic-gate dogetcwd(char *buf, size_t buflen) 14807c478bd9Sstevel@tonic-gate { 14817c478bd9Sstevel@tonic-gate int ret; 14827c478bd9Sstevel@tonic-gate vnode_t *vp; 14837c478bd9Sstevel@tonic-gate vnode_t *compvp; 14847c478bd9Sstevel@tonic-gate refstr_t *cwd, *oldcwd; 14857c478bd9Sstevel@tonic-gate const char *value; 14867c478bd9Sstevel@tonic-gate pathname_t rpnp, pnp; 14877c478bd9Sstevel@tonic-gate proc_t *p = curproc; 14887c478bd9Sstevel@tonic-gate 14897c478bd9Sstevel@tonic-gate /* 14907c478bd9Sstevel@tonic-gate * Check to see if there is a cached version of the cwd. If so, lookup 14917c478bd9Sstevel@tonic-gate * the cached value and make sure it is the same vnode. 14927c478bd9Sstevel@tonic-gate */ 14937c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 14947c478bd9Sstevel@tonic-gate if ((cwd = PTOU(p)->u_cwd) != NULL) 14957c478bd9Sstevel@tonic-gate refstr_hold(cwd); 14967c478bd9Sstevel@tonic-gate vp = PTOU(p)->u_cdir; 14977c478bd9Sstevel@tonic-gate VN_HOLD(vp); 14987c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 14997c478bd9Sstevel@tonic-gate 15007c478bd9Sstevel@tonic-gate /* 15017c478bd9Sstevel@tonic-gate * Make sure we have permission to access the current directory. 15027c478bd9Sstevel@tonic-gate */ 1503da6c28aaSamw if ((ret = VOP_ACCESS(vp, VEXEC, 0, CRED(), NULL)) != 0) { 15047c478bd9Sstevel@tonic-gate if (cwd != NULL) 15057c478bd9Sstevel@tonic-gate refstr_rele(cwd); 15067c478bd9Sstevel@tonic-gate VN_RELE(vp); 15077c478bd9Sstevel@tonic-gate return (ret); 15087c478bd9Sstevel@tonic-gate } 15097c478bd9Sstevel@tonic-gate 15107c478bd9Sstevel@tonic-gate if (cwd) { 15117c478bd9Sstevel@tonic-gate value = refstr_value(cwd); 15127c478bd9Sstevel@tonic-gate if ((ret = pn_get((char *)value, UIO_SYSSPACE, &pnp)) != 0) { 15137c478bd9Sstevel@tonic-gate refstr_rele(cwd); 15147c478bd9Sstevel@tonic-gate VN_RELE(vp); 15157c478bd9Sstevel@tonic-gate return (ret); 15167c478bd9Sstevel@tonic-gate } 15177c478bd9Sstevel@tonic-gate 15187c478bd9Sstevel@tonic-gate pn_alloc(&rpnp); 15197c478bd9Sstevel@tonic-gate 15207c478bd9Sstevel@tonic-gate if (lookuppn(&pnp, &rpnp, NO_FOLLOW, NULL, &compvp) == 0) { 15217c478bd9Sstevel@tonic-gate 15227c478bd9Sstevel@tonic-gate if (VN_CMP(vp, compvp) && 15237c478bd9Sstevel@tonic-gate strcmp(value, rpnp.pn_path) == 0) { 15247c478bd9Sstevel@tonic-gate VN_RELE(compvp); 15257c478bd9Sstevel@tonic-gate VN_RELE(vp); 15267c478bd9Sstevel@tonic-gate pn_free(&pnp); 15277c478bd9Sstevel@tonic-gate pn_free(&rpnp); 15287c478bd9Sstevel@tonic-gate if (strlen(value) + 1 > buflen) { 15297c478bd9Sstevel@tonic-gate refstr_rele(cwd); 15307c478bd9Sstevel@tonic-gate return (ENAMETOOLONG); 15317c478bd9Sstevel@tonic-gate } 15327c478bd9Sstevel@tonic-gate bcopy(value, buf, strlen(value) + 1); 15337c478bd9Sstevel@tonic-gate refstr_rele(cwd); 15347c478bd9Sstevel@tonic-gate return (0); 15357c478bd9Sstevel@tonic-gate } 15367c478bd9Sstevel@tonic-gate 15377c478bd9Sstevel@tonic-gate VN_RELE(compvp); 15387c478bd9Sstevel@tonic-gate } 15397c478bd9Sstevel@tonic-gate 15407c478bd9Sstevel@tonic-gate pn_free(&rpnp); 15417c478bd9Sstevel@tonic-gate pn_free(&pnp); 15427c478bd9Sstevel@tonic-gate 15437c478bd9Sstevel@tonic-gate refstr_rele(cwd); 15447c478bd9Sstevel@tonic-gate } 15457c478bd9Sstevel@tonic-gate 15467c478bd9Sstevel@tonic-gate ret = vnodetopath_common(NULL, vp, buf, buflen, CRED(), 15477c478bd9Sstevel@tonic-gate LOOKUP_CHECKREAD); 15487c478bd9Sstevel@tonic-gate 15497c478bd9Sstevel@tonic-gate VN_RELE(vp); 15507c478bd9Sstevel@tonic-gate 15517c478bd9Sstevel@tonic-gate /* 15527c478bd9Sstevel@tonic-gate * Store the new cwd and replace the existing cached copy. 15537c478bd9Sstevel@tonic-gate */ 15547c478bd9Sstevel@tonic-gate if (ret == 0) 15557c478bd9Sstevel@tonic-gate cwd = refstr_alloc(buf); 15567c478bd9Sstevel@tonic-gate else 15577c478bd9Sstevel@tonic-gate cwd = NULL; 15587c478bd9Sstevel@tonic-gate 15597c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 15607c478bd9Sstevel@tonic-gate oldcwd = PTOU(p)->u_cwd; 15617c478bd9Sstevel@tonic-gate PTOU(p)->u_cwd = cwd; 15627c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 15637c478bd9Sstevel@tonic-gate 15647c478bd9Sstevel@tonic-gate if (oldcwd) 15657c478bd9Sstevel@tonic-gate refstr_rele(oldcwd); 15667c478bd9Sstevel@tonic-gate 15677c478bd9Sstevel@tonic-gate return (ret); 15687c478bd9Sstevel@tonic-gate } 1569