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 /* 222e538c1cSvv * Copyright 2007 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 407c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 417c478bd9Sstevel@tonic-gate 427c478bd9Sstevel@tonic-gate #include <sys/types.h> 437c478bd9Sstevel@tonic-gate #include <sys/param.h> 447c478bd9Sstevel@tonic-gate #include <sys/systm.h> 457c478bd9Sstevel@tonic-gate #include <sys/cpuvar.h> 467c478bd9Sstevel@tonic-gate #include <sys/errno.h> 477c478bd9Sstevel@tonic-gate #include <sys/cred.h> 487c478bd9Sstevel@tonic-gate #include <sys/user.h> 497c478bd9Sstevel@tonic-gate #include <sys/uio.h> 507c478bd9Sstevel@tonic-gate #include <sys/vfs.h> 517c478bd9Sstevel@tonic-gate #include <sys/vnode.h> 527c478bd9Sstevel@tonic-gate #include <sys/pathname.h> 537c478bd9Sstevel@tonic-gate #include <sys/proc.h> 547c478bd9Sstevel@tonic-gate #include <sys/vtrace.h> 557c478bd9Sstevel@tonic-gate #include <sys/sysmacros.h> 567c478bd9Sstevel@tonic-gate #include <sys/debug.h> 577c478bd9Sstevel@tonic-gate #include <sys/dirent.h> 587c478bd9Sstevel@tonic-gate #include <c2/audit.h> 597c478bd9Sstevel@tonic-gate #include <sys/zone.h> 607c478bd9Sstevel@tonic-gate #include <sys/dnlc.h> 617c478bd9Sstevel@tonic-gate #include <sys/fs/snode.h> 627c478bd9Sstevel@tonic-gate 637c478bd9Sstevel@tonic-gate /* Controls whether paths are stored with vnodes. */ 647c478bd9Sstevel@tonic-gate int vfs_vnode_path = 1; 657c478bd9Sstevel@tonic-gate 667c478bd9Sstevel@tonic-gate int 677c478bd9Sstevel@tonic-gate lookupname( 687c478bd9Sstevel@tonic-gate char *fnamep, 697c478bd9Sstevel@tonic-gate enum uio_seg seg, 707c478bd9Sstevel@tonic-gate enum symfollow followlink, 717c478bd9Sstevel@tonic-gate vnode_t **dirvpp, 727c478bd9Sstevel@tonic-gate vnode_t **compvpp) 737c478bd9Sstevel@tonic-gate { 747c478bd9Sstevel@tonic-gate return (lookupnameat(fnamep, seg, followlink, dirvpp, compvpp, NULL)); 757c478bd9Sstevel@tonic-gate } 767c478bd9Sstevel@tonic-gate 777c478bd9Sstevel@tonic-gate 787c478bd9Sstevel@tonic-gate /* 797c478bd9Sstevel@tonic-gate * Lookup the user file name, 807c478bd9Sstevel@tonic-gate * Handle allocation and freeing of pathname buffer, return error. 817c478bd9Sstevel@tonic-gate */ 827c478bd9Sstevel@tonic-gate int 837c478bd9Sstevel@tonic-gate lookupnameat( 847c478bd9Sstevel@tonic-gate char *fnamep, /* user pathname */ 857c478bd9Sstevel@tonic-gate enum uio_seg seg, /* addr space that name is in */ 867c478bd9Sstevel@tonic-gate enum symfollow followlink, /* follow sym links */ 877c478bd9Sstevel@tonic-gate vnode_t **dirvpp, /* ret for ptr to parent dir vnode */ 887c478bd9Sstevel@tonic-gate vnode_t **compvpp, /* ret for ptr to component vnode */ 897c478bd9Sstevel@tonic-gate vnode_t *startvp) /* start path search from vp */ 907c478bd9Sstevel@tonic-gate { 917c478bd9Sstevel@tonic-gate char namebuf[TYPICALMAXPATHLEN]; 927c478bd9Sstevel@tonic-gate struct pathname lookpn; 937c478bd9Sstevel@tonic-gate int error; 947c478bd9Sstevel@tonic-gate 957c478bd9Sstevel@tonic-gate error = pn_get_buf(fnamep, seg, &lookpn, namebuf, sizeof (namebuf)); 967c478bd9Sstevel@tonic-gate if (error == 0) { 977c478bd9Sstevel@tonic-gate #ifdef C2_AUDIT 987c478bd9Sstevel@tonic-gate if (audit_active) 997c478bd9Sstevel@tonic-gate audit_lookupname(); 1007c478bd9Sstevel@tonic-gate #endif 1017c478bd9Sstevel@tonic-gate error = lookuppnat(&lookpn, NULL, followlink, 1027c478bd9Sstevel@tonic-gate dirvpp, compvpp, startvp); 1037c478bd9Sstevel@tonic-gate } 1047c478bd9Sstevel@tonic-gate if (error == ENAMETOOLONG) { 1057c478bd9Sstevel@tonic-gate /* 1067c478bd9Sstevel@tonic-gate * This thread used a pathname > TYPICALMAXPATHLEN bytes long. 1077c478bd9Sstevel@tonic-gate */ 1087c478bd9Sstevel@tonic-gate if (error = pn_get(fnamep, seg, &lookpn)) 1097c478bd9Sstevel@tonic-gate return (error); 1107c478bd9Sstevel@tonic-gate error = lookuppnat(&lookpn, NULL, followlink, 1117c478bd9Sstevel@tonic-gate dirvpp, compvpp, startvp); 1127c478bd9Sstevel@tonic-gate pn_free(&lookpn); 1137c478bd9Sstevel@tonic-gate } 1147c478bd9Sstevel@tonic-gate 1157c478bd9Sstevel@tonic-gate return (error); 1167c478bd9Sstevel@tonic-gate } 1177c478bd9Sstevel@tonic-gate 1187c478bd9Sstevel@tonic-gate /* 1197c478bd9Sstevel@tonic-gate * Lookup the user file name from a given vp, 1207c478bd9Sstevel@tonic-gate */ 1217c478bd9Sstevel@tonic-gate int 1227c478bd9Sstevel@tonic-gate lookuppn( 1237c478bd9Sstevel@tonic-gate struct pathname *pnp, 1247c478bd9Sstevel@tonic-gate struct pathname *rpnp, 1257c478bd9Sstevel@tonic-gate enum symfollow followlink, 1267c478bd9Sstevel@tonic-gate vnode_t **dirvpp, 1277c478bd9Sstevel@tonic-gate vnode_t **compvpp) 1287c478bd9Sstevel@tonic-gate { 1297c478bd9Sstevel@tonic-gate return (lookuppnat(pnp, rpnp, followlink, dirvpp, compvpp, NULL)); 1307c478bd9Sstevel@tonic-gate } 1317c478bd9Sstevel@tonic-gate 1327c478bd9Sstevel@tonic-gate int 1337c478bd9Sstevel@tonic-gate lookuppnat( 1347c478bd9Sstevel@tonic-gate struct pathname *pnp, /* pathname to lookup */ 1357c478bd9Sstevel@tonic-gate struct pathname *rpnp, /* if non-NULL, return resolved path */ 1367c478bd9Sstevel@tonic-gate enum symfollow followlink, /* (don't) follow sym links */ 1377c478bd9Sstevel@tonic-gate vnode_t **dirvpp, /* ptr for parent vnode */ 1387c478bd9Sstevel@tonic-gate vnode_t **compvpp, /* ptr for entry vnode */ 1397c478bd9Sstevel@tonic-gate vnode_t *startvp) /* start search from this vp */ 1407c478bd9Sstevel@tonic-gate { 1417c478bd9Sstevel@tonic-gate vnode_t *vp; /* current directory vp */ 1427c478bd9Sstevel@tonic-gate vnode_t *rootvp; 1437c478bd9Sstevel@tonic-gate proc_t *p = curproc; 1447c478bd9Sstevel@tonic-gate 1457c478bd9Sstevel@tonic-gate if (pnp->pn_pathlen == 0) 1467c478bd9Sstevel@tonic-gate return (ENOENT); 1477c478bd9Sstevel@tonic-gate 1487c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); /* for u_rdir and u_cdir */ 1497c478bd9Sstevel@tonic-gate if ((rootvp = PTOU(p)->u_rdir) == NULL) 1507c478bd9Sstevel@tonic-gate rootvp = rootdir; 1517c478bd9Sstevel@tonic-gate else if (rootvp != rootdir) /* no need to VN_HOLD rootdir */ 1527c478bd9Sstevel@tonic-gate VN_HOLD(rootvp); 1537c478bd9Sstevel@tonic-gate 1547c478bd9Sstevel@tonic-gate if (pnp->pn_path[0] == '/') { 1557c478bd9Sstevel@tonic-gate vp = rootvp; 1567c478bd9Sstevel@tonic-gate } else { 1577c478bd9Sstevel@tonic-gate vp = (startvp == NULL) ? PTOU(p)->u_cdir : startvp; 1587c478bd9Sstevel@tonic-gate } 1597c478bd9Sstevel@tonic-gate VN_HOLD(vp); 1607c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 1617c478bd9Sstevel@tonic-gate 1627c478bd9Sstevel@tonic-gate /* 1637c478bd9Sstevel@tonic-gate * Skip over leading slashes 1647c478bd9Sstevel@tonic-gate */ 1657c478bd9Sstevel@tonic-gate if (pnp->pn_path[0] == '/') { 1667c478bd9Sstevel@tonic-gate do { 1677c478bd9Sstevel@tonic-gate pnp->pn_path++; 1687c478bd9Sstevel@tonic-gate pnp->pn_pathlen--; 1697c478bd9Sstevel@tonic-gate } while (pnp->pn_path[0] == '/'); 1707c478bd9Sstevel@tonic-gate } 1717c478bd9Sstevel@tonic-gate 1727c478bd9Sstevel@tonic-gate return (lookuppnvp(pnp, rpnp, followlink, dirvpp, 1737c478bd9Sstevel@tonic-gate compvpp, rootvp, vp, CRED())); 1747c478bd9Sstevel@tonic-gate } 1757c478bd9Sstevel@tonic-gate 1767c478bd9Sstevel@tonic-gate /* Private flag to do our getcwd() dirty work */ 1777c478bd9Sstevel@tonic-gate #define LOOKUP_CHECKREAD 0x10 1787c478bd9Sstevel@tonic-gate #define LOOKUP_MASK (~LOOKUP_CHECKREAD) 1797c478bd9Sstevel@tonic-gate 1807c478bd9Sstevel@tonic-gate /* 1817c478bd9Sstevel@tonic-gate * Starting at current directory, translate pathname pnp to end. 1827c478bd9Sstevel@tonic-gate * Leave pathname of final component in pnp, return the vnode 1837c478bd9Sstevel@tonic-gate * for the final component in *compvpp, and return the vnode 1847c478bd9Sstevel@tonic-gate * for the parent of the final component in dirvpp. 1857c478bd9Sstevel@tonic-gate * 1867c478bd9Sstevel@tonic-gate * This is the central routine in pathname translation and handles 1877c478bd9Sstevel@tonic-gate * multiple components in pathnames, separating them at /'s. It also 1887c478bd9Sstevel@tonic-gate * implements mounted file systems and processes symbolic links. 1897c478bd9Sstevel@tonic-gate * 1907c478bd9Sstevel@tonic-gate * vp is the vnode where the directory search should start. 1917c478bd9Sstevel@tonic-gate * 1927c478bd9Sstevel@tonic-gate * Reference counts: vp must be held prior to calling this function. rootvp 1937c478bd9Sstevel@tonic-gate * should only be held if rootvp != rootdir. 1947c478bd9Sstevel@tonic-gate */ 1957c478bd9Sstevel@tonic-gate int 1967c478bd9Sstevel@tonic-gate lookuppnvp( 1977c478bd9Sstevel@tonic-gate struct pathname *pnp, /* pathname to lookup */ 1987c478bd9Sstevel@tonic-gate struct pathname *rpnp, /* if non-NULL, return resolved path */ 1997c478bd9Sstevel@tonic-gate int flags, /* follow symlinks */ 2007c478bd9Sstevel@tonic-gate vnode_t **dirvpp, /* ptr for parent vnode */ 2017c478bd9Sstevel@tonic-gate vnode_t **compvpp, /* ptr for entry vnode */ 2027c478bd9Sstevel@tonic-gate vnode_t *rootvp, /* rootvp */ 2037c478bd9Sstevel@tonic-gate vnode_t *vp, /* directory to start search at */ 2047c478bd9Sstevel@tonic-gate cred_t *cr) /* user's credential */ 2057c478bd9Sstevel@tonic-gate { 2067c478bd9Sstevel@tonic-gate vnode_t *cvp; /* current component vp */ 2077c478bd9Sstevel@tonic-gate vnode_t *tvp; /* addressable temp ptr */ 2087c478bd9Sstevel@tonic-gate char component[MAXNAMELEN]; /* buffer for component (incl null) */ 2097c478bd9Sstevel@tonic-gate int error; 2107c478bd9Sstevel@tonic-gate int nlink; 2117c478bd9Sstevel@tonic-gate int lookup_flags; 212*da6c28aaSamw struct pathname presrvd; /* case preserved name */ 213*da6c28aaSamw struct pathname *pp = NULL; 2147c478bd9Sstevel@tonic-gate vnode_t *startvp; 2157c478bd9Sstevel@tonic-gate vnode_t *zonevp = curproc->p_zone->zone_rootvp; /* zone root */ 2167c478bd9Sstevel@tonic-gate int must_be_directory = 0; 2172e538c1cSvv boolean_t retry_with_kcred = B_FALSE; 2187c478bd9Sstevel@tonic-gate 2197c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(CPU, sys, namei, 1); 2207c478bd9Sstevel@tonic-gate nlink = 0; 2217c478bd9Sstevel@tonic-gate cvp = NULL; 2227c478bd9Sstevel@tonic-gate if (rpnp) 2237c478bd9Sstevel@tonic-gate rpnp->pn_pathlen = 0; 224*da6c28aaSamw 2257c478bd9Sstevel@tonic-gate lookup_flags = dirvpp ? LOOKUP_DIR : 0; 226*da6c28aaSamw if (flags & FIGNORECASE) { 227*da6c28aaSamw lookup_flags |= FIGNORECASE; 228*da6c28aaSamw pn_alloc(&presrvd); 229*da6c28aaSamw pp = &presrvd; 230*da6c28aaSamw } 231*da6c28aaSamw 2327c478bd9Sstevel@tonic-gate #ifdef C2_AUDIT 2337c478bd9Sstevel@tonic-gate if (audit_active) 2347c478bd9Sstevel@tonic-gate audit_anchorpath(pnp, vp == rootvp); 2357c478bd9Sstevel@tonic-gate #endif 2367c478bd9Sstevel@tonic-gate 2377c478bd9Sstevel@tonic-gate /* 2387c478bd9Sstevel@tonic-gate * Eliminate any trailing slashes in the pathname. 2397c478bd9Sstevel@tonic-gate * If there are any, we must follow all symlinks. 2407c478bd9Sstevel@tonic-gate * Also, we must guarantee that the last component is a directory. 2417c478bd9Sstevel@tonic-gate */ 2427c478bd9Sstevel@tonic-gate if (pn_fixslash(pnp)) { 2437c478bd9Sstevel@tonic-gate flags |= FOLLOW; 2447c478bd9Sstevel@tonic-gate must_be_directory = 1; 2457c478bd9Sstevel@tonic-gate } 2467c478bd9Sstevel@tonic-gate 2477c478bd9Sstevel@tonic-gate startvp = vp; 2487c478bd9Sstevel@tonic-gate next: 2497c478bd9Sstevel@tonic-gate /* 2507c478bd9Sstevel@tonic-gate * Make sure we have a directory. 2517c478bd9Sstevel@tonic-gate */ 2527c478bd9Sstevel@tonic-gate if (vp->v_type != VDIR) { 2537c478bd9Sstevel@tonic-gate error = ENOTDIR; 2547c478bd9Sstevel@tonic-gate goto bad; 2557c478bd9Sstevel@tonic-gate } 2567c478bd9Sstevel@tonic-gate 2577c478bd9Sstevel@tonic-gate if (rpnp && VN_CMP(vp, rootvp)) 2587c478bd9Sstevel@tonic-gate (void) pn_set(rpnp, "/"); 2597c478bd9Sstevel@tonic-gate 2607c478bd9Sstevel@tonic-gate /* 2617c478bd9Sstevel@tonic-gate * Process the next component of the pathname. 2627c478bd9Sstevel@tonic-gate */ 2637c478bd9Sstevel@tonic-gate if (error = pn_getcomponent(pnp, component)) { 2647c478bd9Sstevel@tonic-gate #ifdef C2_AUDIT 2657c478bd9Sstevel@tonic-gate if (audit_active) 2667c478bd9Sstevel@tonic-gate audit_addcomponent(pnp); 2677c478bd9Sstevel@tonic-gate #endif 2687c478bd9Sstevel@tonic-gate goto bad; 2697c478bd9Sstevel@tonic-gate } 2707c478bd9Sstevel@tonic-gate 2717c478bd9Sstevel@tonic-gate /* 2727c478bd9Sstevel@tonic-gate * Handle "..": two special cases. 2737c478bd9Sstevel@tonic-gate * 1. If we're at the root directory (e.g. after chroot or 2747c478bd9Sstevel@tonic-gate * zone_enter) then change ".." to "." so we can't get 2757c478bd9Sstevel@tonic-gate * out of this subtree. 2767c478bd9Sstevel@tonic-gate * 2. If this vnode is the root of a mounted file system, 2777c478bd9Sstevel@tonic-gate * then replace it with the vnode that was mounted on 2787c478bd9Sstevel@tonic-gate * so that we take the ".." in the other file system. 2797c478bd9Sstevel@tonic-gate */ 2807c478bd9Sstevel@tonic-gate if (component[0] == '.' && component[1] == '.' && component[2] == 0) { 2817c478bd9Sstevel@tonic-gate checkforroot: 2827c478bd9Sstevel@tonic-gate if (VN_CMP(vp, rootvp) || VN_CMP(vp, zonevp)) { 2837c478bd9Sstevel@tonic-gate component[1] = '\0'; 2847c478bd9Sstevel@tonic-gate } else if (vp->v_flag & VROOT) { 2857c478bd9Sstevel@tonic-gate vfs_t *vfsp; 2867c478bd9Sstevel@tonic-gate cvp = vp; 2877c478bd9Sstevel@tonic-gate 2887c478bd9Sstevel@tonic-gate /* 2897c478bd9Sstevel@tonic-gate * While we deal with the vfs pointer from the vnode 2907c478bd9Sstevel@tonic-gate * the filesystem could have been forcefully unmounted 2917c478bd9Sstevel@tonic-gate * and the vnode's v_vfsp could have been invalidated 2927c478bd9Sstevel@tonic-gate * by VFS_UNMOUNT. Hence, we cache v_vfsp and use it 2937c478bd9Sstevel@tonic-gate * with vfs_rlock_wait/vfs_unlock. 2947c478bd9Sstevel@tonic-gate * It is safe to use the v_vfsp even it is freed by 2957c478bd9Sstevel@tonic-gate * VFS_UNMOUNT because vfs_rlock_wait/vfs_unlock 2967c478bd9Sstevel@tonic-gate * do not dereference v_vfsp. It is just used as a 2977c478bd9Sstevel@tonic-gate * magic cookie. 2987c478bd9Sstevel@tonic-gate * One more corner case here is the memory getting 2997c478bd9Sstevel@tonic-gate * reused for another vfs structure. In this case 3007c478bd9Sstevel@tonic-gate * lookuppnvp's vfs_rlock_wait will succeed, domount's 3017c478bd9Sstevel@tonic-gate * vfs_lock will fail and domount will bail out with an 3027c478bd9Sstevel@tonic-gate * error (EBUSY). 3037c478bd9Sstevel@tonic-gate */ 3047c478bd9Sstevel@tonic-gate vfsp = cvp->v_vfsp; 3057c478bd9Sstevel@tonic-gate 3067c478bd9Sstevel@tonic-gate /* 3077c478bd9Sstevel@tonic-gate * This lock is used to synchronize 3087c478bd9Sstevel@tonic-gate * mounts/unmounts and lookups. 3097c478bd9Sstevel@tonic-gate * Threads doing mounts/unmounts hold the 3107c478bd9Sstevel@tonic-gate * writers version vfs_lock_wait(). 3117c478bd9Sstevel@tonic-gate */ 3127c478bd9Sstevel@tonic-gate 3137c478bd9Sstevel@tonic-gate vfs_rlock_wait(vfsp); 3147c478bd9Sstevel@tonic-gate 3157c478bd9Sstevel@tonic-gate /* 3167c478bd9Sstevel@tonic-gate * If this vnode is on a file system that 3177c478bd9Sstevel@tonic-gate * has been forcibly unmounted, 3187c478bd9Sstevel@tonic-gate * we can't proceed. Cancel this operation 3197c478bd9Sstevel@tonic-gate * and return EIO. 3207c478bd9Sstevel@tonic-gate * 3217c478bd9Sstevel@tonic-gate * vfs_vnodecovered is NULL if unmounted. 3227c478bd9Sstevel@tonic-gate * Currently, nfs uses VFS_UNMOUNTED to 3237c478bd9Sstevel@tonic-gate * check if it's a forced-umount. Keep the 3247c478bd9Sstevel@tonic-gate * same checking here as well even though it 3257c478bd9Sstevel@tonic-gate * may not be needed. 3267c478bd9Sstevel@tonic-gate */ 3277c478bd9Sstevel@tonic-gate if (((vp = cvp->v_vfsp->vfs_vnodecovered) == NULL) || 3287c478bd9Sstevel@tonic-gate (cvp->v_vfsp->vfs_flag & VFS_UNMOUNTED)) { 3297c478bd9Sstevel@tonic-gate vfs_unlock(vfsp); 3307c478bd9Sstevel@tonic-gate VN_RELE(cvp); 331*da6c28aaSamw if (pp) 332*da6c28aaSamw pn_free(pp); 3337c478bd9Sstevel@tonic-gate return (EIO); 3347c478bd9Sstevel@tonic-gate } 3357c478bd9Sstevel@tonic-gate VN_HOLD(vp); 3367c478bd9Sstevel@tonic-gate vfs_unlock(vfsp); 3377c478bd9Sstevel@tonic-gate VN_RELE(cvp); 3387c478bd9Sstevel@tonic-gate cvp = NULL; 3392e538c1cSvv /* 3402e538c1cSvv * Crossing mount points. For eg: We are doing 3412e538c1cSvv * a lookup of ".." for file systems root vnode 3422e538c1cSvv * mounted here, and VOP_LOOKUP() (with covered vnode) 3432e538c1cSvv * will be on underlying file systems mount point 3442e538c1cSvv * vnode. Set retry_with_kcred flag as we might end 3452e538c1cSvv * up doing VOP_LOOKUP() with kcred if required. 3462e538c1cSvv */ 3472e538c1cSvv retry_with_kcred = B_TRUE; 3487c478bd9Sstevel@tonic-gate goto checkforroot; 3497c478bd9Sstevel@tonic-gate } 3507c478bd9Sstevel@tonic-gate } 3517c478bd9Sstevel@tonic-gate 3527c478bd9Sstevel@tonic-gate /* 3537c478bd9Sstevel@tonic-gate * LOOKUP_CHECKREAD is a private flag used by vnodetopath() to indicate 3547c478bd9Sstevel@tonic-gate * that we need to have read permission on every directory in the entire 3557c478bd9Sstevel@tonic-gate * path. This is used to ensure that a forward-lookup of a cached value 3567c478bd9Sstevel@tonic-gate * has the same effect as a reverse-lookup when the cached value cannot 3577c478bd9Sstevel@tonic-gate * be found. 3587c478bd9Sstevel@tonic-gate */ 3597c478bd9Sstevel@tonic-gate if ((flags & LOOKUP_CHECKREAD) && 360*da6c28aaSamw (error = VOP_ACCESS(vp, VREAD, 0, cr, NULL)) != 0) 3617c478bd9Sstevel@tonic-gate goto bad; 3627c478bd9Sstevel@tonic-gate 3637c478bd9Sstevel@tonic-gate /* 3647c478bd9Sstevel@tonic-gate * Perform a lookup in the current directory. 3657c478bd9Sstevel@tonic-gate */ 3667c478bd9Sstevel@tonic-gate error = VOP_LOOKUP(vp, component, &tvp, pnp, lookup_flags, 367*da6c28aaSamw rootvp, cr, NULL, NULL, pp); 3682e538c1cSvv 3692e538c1cSvv /* 3702e538c1cSvv * Retry with kcred - If crossing mount points & error is EACCES. 3712e538c1cSvv * 3722e538c1cSvv * If we are crossing mount points here and doing ".." lookup, 3732e538c1cSvv * VOP_LOOKUP() might fail if the underlying file systems 3742e538c1cSvv * mount point has no execute permission. In cases like these, 3752e538c1cSvv * we retry VOP_LOOKUP() by giving as much privilage as possible 3762e538c1cSvv * by passing kcred credentials. 3772e538c1cSvv * 3782e538c1cSvv * In case of hierarchical file systems, passing kcred still may 3792e538c1cSvv * or may not work. 3802e538c1cSvv * For eg: UFS FS --> Mount NFS FS --> Again mount UFS on some 3812e538c1cSvv * directory inside NFS FS. 3822e538c1cSvv */ 3832e538c1cSvv if ((error == EACCES) && retry_with_kcred) 3842e538c1cSvv error = VOP_LOOKUP(vp, component, &tvp, pnp, lookup_flags, 385*da6c28aaSamw rootvp, zone_kcred(), NULL, NULL, pp); 3862e538c1cSvv 3877c478bd9Sstevel@tonic-gate cvp = tvp; 3887c478bd9Sstevel@tonic-gate if (error) { 3897c478bd9Sstevel@tonic-gate cvp = NULL; 3907c478bd9Sstevel@tonic-gate /* 3917c478bd9Sstevel@tonic-gate * On error, return hard error if 3927c478bd9Sstevel@tonic-gate * (a) we're not at the end of the pathname yet, or 3937c478bd9Sstevel@tonic-gate * (b) the caller didn't want the parent directory, or 3947c478bd9Sstevel@tonic-gate * (c) we failed for some reason other than a missing entry. 3957c478bd9Sstevel@tonic-gate */ 3967c478bd9Sstevel@tonic-gate if (pn_pathleft(pnp) || dirvpp == NULL || error != ENOENT) 3977c478bd9Sstevel@tonic-gate goto bad; 3987c478bd9Sstevel@tonic-gate #ifdef C2_AUDIT 3997c478bd9Sstevel@tonic-gate if (audit_active) { /* directory access */ 4007c478bd9Sstevel@tonic-gate if (error = audit_savepath(pnp, vp, error, cr)) 4017c478bd9Sstevel@tonic-gate goto bad_noaudit; 4027c478bd9Sstevel@tonic-gate } 4037c478bd9Sstevel@tonic-gate #endif 4047c478bd9Sstevel@tonic-gate pn_setlast(pnp); 4057c478bd9Sstevel@tonic-gate /* 4067c478bd9Sstevel@tonic-gate * We inform the caller that the desired entry must be 4077c478bd9Sstevel@tonic-gate * a directory by adding a '/' to the component name. 4087c478bd9Sstevel@tonic-gate */ 4097c478bd9Sstevel@tonic-gate if (must_be_directory && (error = pn_addslash(pnp)) != 0) 4107c478bd9Sstevel@tonic-gate goto bad; 4117c478bd9Sstevel@tonic-gate *dirvpp = vp; 4127c478bd9Sstevel@tonic-gate if (compvpp != NULL) 4137c478bd9Sstevel@tonic-gate *compvpp = NULL; 4147c478bd9Sstevel@tonic-gate if (rootvp != rootdir) 4157c478bd9Sstevel@tonic-gate VN_RELE(rootvp); 416*da6c28aaSamw if (pp) 417*da6c28aaSamw pn_free(pp); 4187c478bd9Sstevel@tonic-gate return (0); 4197c478bd9Sstevel@tonic-gate } 4207c478bd9Sstevel@tonic-gate 4217c478bd9Sstevel@tonic-gate /* 4227c478bd9Sstevel@tonic-gate * Traverse mount points. 4237c478bd9Sstevel@tonic-gate * XXX why don't we need to hold a read lock here (call vn_vfsrlock)? 4247c478bd9Sstevel@tonic-gate * What prevents a concurrent update to v_vfsmountedhere? 4257c478bd9Sstevel@tonic-gate * Possible answer: if mounting, we might not see the mount 4267c478bd9Sstevel@tonic-gate * if it is concurrently coming into existence, but that's 4277c478bd9Sstevel@tonic-gate * really not much different from the thread running a bit slower. 4287c478bd9Sstevel@tonic-gate * If unmounting, we may get into traverse() when we shouldn't, 4297c478bd9Sstevel@tonic-gate * but traverse() will catch this case for us. 4307c478bd9Sstevel@tonic-gate * (For this to work, fetching v_vfsmountedhere had better 4317c478bd9Sstevel@tonic-gate * be atomic!) 4327c478bd9Sstevel@tonic-gate */ 4337c478bd9Sstevel@tonic-gate if (vn_mountedvfs(cvp) != NULL) { 4347c478bd9Sstevel@tonic-gate tvp = cvp; 4357c478bd9Sstevel@tonic-gate if ((error = traverse(&tvp)) != 0) { 4367c478bd9Sstevel@tonic-gate /* 4377c478bd9Sstevel@tonic-gate * It is required to assign cvp here, because 4387c478bd9Sstevel@tonic-gate * traverse() will return a held vnode which 4397c478bd9Sstevel@tonic-gate * may different than the vnode that was passed 4407c478bd9Sstevel@tonic-gate * in (even in the error case). If traverse() 4417c478bd9Sstevel@tonic-gate * changes the vnode it releases the original, 4427c478bd9Sstevel@tonic-gate * and holds the new one. 4437c478bd9Sstevel@tonic-gate */ 4447c478bd9Sstevel@tonic-gate cvp = tvp; 4457c478bd9Sstevel@tonic-gate goto bad; 4467c478bd9Sstevel@tonic-gate } 4477c478bd9Sstevel@tonic-gate cvp = tvp; 4487c478bd9Sstevel@tonic-gate } 4497c478bd9Sstevel@tonic-gate 4507c478bd9Sstevel@tonic-gate /* 4517c478bd9Sstevel@tonic-gate * If we hit a symbolic link and there is more path to be 4527c478bd9Sstevel@tonic-gate * translated or this operation does not wish to apply 4537c478bd9Sstevel@tonic-gate * to a link, then place the contents of the link at the 4547c478bd9Sstevel@tonic-gate * front of the remaining pathname. 4557c478bd9Sstevel@tonic-gate */ 4567c478bd9Sstevel@tonic-gate if (cvp->v_type == VLNK && ((flags & FOLLOW) || pn_pathleft(pnp))) { 4577c478bd9Sstevel@tonic-gate struct pathname linkpath; 4587c478bd9Sstevel@tonic-gate #ifdef C2_AUDIT 4597c478bd9Sstevel@tonic-gate if (audit_active) { 4607c478bd9Sstevel@tonic-gate if (error = audit_pathcomp(pnp, cvp, cr)) 4617c478bd9Sstevel@tonic-gate goto bad; 4627c478bd9Sstevel@tonic-gate } 4637c478bd9Sstevel@tonic-gate #endif 4647c478bd9Sstevel@tonic-gate 4657c478bd9Sstevel@tonic-gate if (++nlink > MAXSYMLINKS) { 4667c478bd9Sstevel@tonic-gate error = ELOOP; 4677c478bd9Sstevel@tonic-gate goto bad; 4687c478bd9Sstevel@tonic-gate } 4697c478bd9Sstevel@tonic-gate pn_alloc(&linkpath); 4707c478bd9Sstevel@tonic-gate if (error = pn_getsymlink(cvp, &linkpath, cr)) { 4717c478bd9Sstevel@tonic-gate pn_free(&linkpath); 4727c478bd9Sstevel@tonic-gate goto bad; 4737c478bd9Sstevel@tonic-gate } 4747c478bd9Sstevel@tonic-gate 4757c478bd9Sstevel@tonic-gate #ifdef C2_AUDIT 4767c478bd9Sstevel@tonic-gate if (audit_active) 4777c478bd9Sstevel@tonic-gate audit_symlink(pnp, &linkpath); 4787c478bd9Sstevel@tonic-gate #endif /* C2_AUDIT */ 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 } 5017c478bd9Sstevel@tonic-gate #ifdef C2_AUDIT 5027c478bd9Sstevel@tonic-gate if (audit_active) 5037c478bd9Sstevel@tonic-gate audit_anchorpath(pnp, vp == rootvp); 5047c478bd9Sstevel@tonic-gate #endif 5057c478bd9Sstevel@tonic-gate if (pn_fixslash(pnp)) { 5067c478bd9Sstevel@tonic-gate flags |= FOLLOW; 5077c478bd9Sstevel@tonic-gate must_be_directory = 1; 5087c478bd9Sstevel@tonic-gate } 5097c478bd9Sstevel@tonic-gate goto next; 5107c478bd9Sstevel@tonic-gate } 5117c478bd9Sstevel@tonic-gate 5127c478bd9Sstevel@tonic-gate /* 5137c478bd9Sstevel@tonic-gate * If rpnp is non-NULL, remember the resolved path name therein. 5147c478bd9Sstevel@tonic-gate * Do not include "." components. Collapse occurrences of 5157c478bd9Sstevel@tonic-gate * "previous/..", so long as "previous" is not itself "..". 5167c478bd9Sstevel@tonic-gate * Exhausting rpnp results in error ENAMETOOLONG. 5177c478bd9Sstevel@tonic-gate */ 5187c478bd9Sstevel@tonic-gate if (rpnp && strcmp(component, ".") != 0) { 5197c478bd9Sstevel@tonic-gate size_t len; 5207c478bd9Sstevel@tonic-gate 5217c478bd9Sstevel@tonic-gate if (strcmp(component, "..") == 0 && 5227c478bd9Sstevel@tonic-gate rpnp->pn_pathlen != 0 && 5237c478bd9Sstevel@tonic-gate !((rpnp->pn_pathlen > 2 && 5247c478bd9Sstevel@tonic-gate strncmp(rpnp->pn_path+rpnp->pn_pathlen-3, "/..", 3) == 0) || 5257c478bd9Sstevel@tonic-gate (rpnp->pn_pathlen == 2 && 5267c478bd9Sstevel@tonic-gate strncmp(rpnp->pn_path, "..", 2) == 0))) { 5277c478bd9Sstevel@tonic-gate while (rpnp->pn_pathlen && 5287c478bd9Sstevel@tonic-gate rpnp->pn_path[rpnp->pn_pathlen-1] != '/') 5297c478bd9Sstevel@tonic-gate rpnp->pn_pathlen--; 5307c478bd9Sstevel@tonic-gate if (rpnp->pn_pathlen > 1) 5317c478bd9Sstevel@tonic-gate rpnp->pn_pathlen--; 5327c478bd9Sstevel@tonic-gate rpnp->pn_path[rpnp->pn_pathlen] = '\0'; 5337c478bd9Sstevel@tonic-gate } else { 5347c478bd9Sstevel@tonic-gate if (rpnp->pn_pathlen != 0 && 5357c478bd9Sstevel@tonic-gate rpnp->pn_path[rpnp->pn_pathlen-1] != '/') 5367c478bd9Sstevel@tonic-gate rpnp->pn_path[rpnp->pn_pathlen++] = '/'; 537*da6c28aaSamw if (flags & FIGNORECASE) { 538*da6c28aaSamw /* 539*da6c28aaSamw * Return the case-preserved name 540*da6c28aaSamw * within the resolved path. 541*da6c28aaSamw */ 542*da6c28aaSamw error = copystr(pp->pn_path, 543*da6c28aaSamw rpnp->pn_path + rpnp->pn_pathlen, 544*da6c28aaSamw rpnp->pn_bufsize - rpnp->pn_pathlen, &len); 545*da6c28aaSamw } else { 546*da6c28aaSamw error = copystr(component, 547*da6c28aaSamw rpnp->pn_path + rpnp->pn_pathlen, 548*da6c28aaSamw rpnp->pn_bufsize - rpnp->pn_pathlen, &len); 549*da6c28aaSamw } 5507c478bd9Sstevel@tonic-gate if (error) /* copystr() returns ENAMETOOLONG */ 5517c478bd9Sstevel@tonic-gate goto bad; 5527c478bd9Sstevel@tonic-gate rpnp->pn_pathlen += (len - 1); 5537c478bd9Sstevel@tonic-gate ASSERT(rpnp->pn_bufsize > rpnp->pn_pathlen); 5547c478bd9Sstevel@tonic-gate } 5557c478bd9Sstevel@tonic-gate } 5567c478bd9Sstevel@tonic-gate 5577c478bd9Sstevel@tonic-gate /* 5587c478bd9Sstevel@tonic-gate * If no more components, return last directory (if wanted) and 5597c478bd9Sstevel@tonic-gate * last component (if wanted). 5607c478bd9Sstevel@tonic-gate */ 5617c478bd9Sstevel@tonic-gate if (pn_pathleft(pnp) == 0) { 5627c478bd9Sstevel@tonic-gate /* 5637c478bd9Sstevel@tonic-gate * If there was a trailing slash in the pathname, 5647c478bd9Sstevel@tonic-gate * make sure the last component is a directory. 5657c478bd9Sstevel@tonic-gate */ 5667c478bd9Sstevel@tonic-gate if (must_be_directory && cvp->v_type != VDIR) { 5677c478bd9Sstevel@tonic-gate error = ENOTDIR; 5687c478bd9Sstevel@tonic-gate goto bad; 5697c478bd9Sstevel@tonic-gate } 5707c478bd9Sstevel@tonic-gate if (dirvpp != NULL) { 5717c478bd9Sstevel@tonic-gate /* 5727c478bd9Sstevel@tonic-gate * Check that we have the real parent and not 5737c478bd9Sstevel@tonic-gate * an alias of the last component. 5747c478bd9Sstevel@tonic-gate */ 5757c478bd9Sstevel@tonic-gate if (vn_compare(vp, cvp)) { 5767c478bd9Sstevel@tonic-gate #ifdef C2_AUDIT 5777c478bd9Sstevel@tonic-gate if (audit_active) 5787c478bd9Sstevel@tonic-gate (void) audit_savepath(pnp, cvp, 5792e538c1cSvv EINVAL, cr); 5807c478bd9Sstevel@tonic-gate #endif 5817c478bd9Sstevel@tonic-gate pn_setlast(pnp); 5827c478bd9Sstevel@tonic-gate VN_RELE(vp); 5837c478bd9Sstevel@tonic-gate VN_RELE(cvp); 5847c478bd9Sstevel@tonic-gate if (rootvp != rootdir) 5857c478bd9Sstevel@tonic-gate VN_RELE(rootvp); 586*da6c28aaSamw if (pp) 587*da6c28aaSamw pn_free(pp); 5887c478bd9Sstevel@tonic-gate return (EINVAL); 5897c478bd9Sstevel@tonic-gate } 5907c478bd9Sstevel@tonic-gate #ifdef C2_AUDIT 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 #endif 5967c478bd9Sstevel@tonic-gate *dirvpp = vp; 5977c478bd9Sstevel@tonic-gate } else 5987c478bd9Sstevel@tonic-gate VN_RELE(vp); 5997c478bd9Sstevel@tonic-gate #ifdef C2_AUDIT 6007c478bd9Sstevel@tonic-gate if (audit_active) 6017c478bd9Sstevel@tonic-gate (void) audit_savepath(pnp, cvp, 0, cr); 6027c478bd9Sstevel@tonic-gate #endif 6037c478bd9Sstevel@tonic-gate if (pnp->pn_path == pnp->pn_buf) 6047c478bd9Sstevel@tonic-gate (void) pn_set(pnp, "."); 6057c478bd9Sstevel@tonic-gate else 6067c478bd9Sstevel@tonic-gate pn_setlast(pnp); 6077c478bd9Sstevel@tonic-gate if (rpnp) { 6087c478bd9Sstevel@tonic-gate if (VN_CMP(cvp, rootvp)) 6097c478bd9Sstevel@tonic-gate (void) pn_set(rpnp, "/"); 6107c478bd9Sstevel@tonic-gate else if (rpnp->pn_pathlen == 0) 6117c478bd9Sstevel@tonic-gate (void) pn_set(rpnp, "."); 6127c478bd9Sstevel@tonic-gate } 6137c478bd9Sstevel@tonic-gate 6147c478bd9Sstevel@tonic-gate if (compvpp != NULL) 6157c478bd9Sstevel@tonic-gate *compvpp = cvp; 6167c478bd9Sstevel@tonic-gate else 6177c478bd9Sstevel@tonic-gate VN_RELE(cvp); 6187c478bd9Sstevel@tonic-gate if (rootvp != rootdir) 6197c478bd9Sstevel@tonic-gate VN_RELE(rootvp); 620*da6c28aaSamw if (pp) 621*da6c28aaSamw pn_free(pp); 6227c478bd9Sstevel@tonic-gate return (0); 6237c478bd9Sstevel@tonic-gate } 6247c478bd9Sstevel@tonic-gate 6257c478bd9Sstevel@tonic-gate #ifdef C2_AUDIT 6267c478bd9Sstevel@tonic-gate if (audit_active) { 6277c478bd9Sstevel@tonic-gate if (error = audit_pathcomp(pnp, cvp, cr)) 6287c478bd9Sstevel@tonic-gate goto bad; 6297c478bd9Sstevel@tonic-gate } 6307c478bd9Sstevel@tonic-gate #endif 6317c478bd9Sstevel@tonic-gate 6327c478bd9Sstevel@tonic-gate /* 6337c478bd9Sstevel@tonic-gate * Skip over slashes from end of last component. 6347c478bd9Sstevel@tonic-gate */ 6357c478bd9Sstevel@tonic-gate while (pnp->pn_path[0] == '/') { 6367c478bd9Sstevel@tonic-gate pnp->pn_path++; 6377c478bd9Sstevel@tonic-gate pnp->pn_pathlen--; 6387c478bd9Sstevel@tonic-gate } 6397c478bd9Sstevel@tonic-gate 6407c478bd9Sstevel@tonic-gate /* 6417c478bd9Sstevel@tonic-gate * Searched through another level of directory: 6427c478bd9Sstevel@tonic-gate * release previous directory handle and save new (result 6437c478bd9Sstevel@tonic-gate * of lookup) as current directory. 6447c478bd9Sstevel@tonic-gate */ 6457c478bd9Sstevel@tonic-gate VN_RELE(vp); 6467c478bd9Sstevel@tonic-gate vp = cvp; 6477c478bd9Sstevel@tonic-gate cvp = NULL; 6487c478bd9Sstevel@tonic-gate goto next; 6497c478bd9Sstevel@tonic-gate 6507c478bd9Sstevel@tonic-gate bad: 6517c478bd9Sstevel@tonic-gate #ifdef C2_AUDIT 6527c478bd9Sstevel@tonic-gate if (audit_active) /* reached end of path */ 6537c478bd9Sstevel@tonic-gate (void) audit_savepath(pnp, cvp, error, cr); 6547c478bd9Sstevel@tonic-gate bad_noaudit: 6557c478bd9Sstevel@tonic-gate #endif 6567c478bd9Sstevel@tonic-gate /* 6577c478bd9Sstevel@tonic-gate * Error. Release vnodes and return. 6587c478bd9Sstevel@tonic-gate */ 6597c478bd9Sstevel@tonic-gate if (cvp) 6607c478bd9Sstevel@tonic-gate VN_RELE(cvp); 6617c478bd9Sstevel@tonic-gate /* 6627c478bd9Sstevel@tonic-gate * If the error was ESTALE and the current directory to look in 6637c478bd9Sstevel@tonic-gate * was the root for this lookup, the root for a mounted file 6647c478bd9Sstevel@tonic-gate * system, or the starting directory for lookups, then 6657c478bd9Sstevel@tonic-gate * return ENOENT instead of ESTALE. In this case, no recovery 6667c478bd9Sstevel@tonic-gate * is possible by the higher level. If ESTALE was returned for 6677c478bd9Sstevel@tonic-gate * some intermediate directory along the path, then recovery 6687c478bd9Sstevel@tonic-gate * is potentially possible and retrying from the higher level 6697c478bd9Sstevel@tonic-gate * will either correct the situation by purging stale cache 6707c478bd9Sstevel@tonic-gate * entries or eventually get back to the point where no recovery 6717c478bd9Sstevel@tonic-gate * is possible. 6727c478bd9Sstevel@tonic-gate */ 6737c478bd9Sstevel@tonic-gate if (error == ESTALE && 6747c478bd9Sstevel@tonic-gate (VN_CMP(vp, rootvp) || (vp->v_flag & VROOT) || vp == startvp)) 6757c478bd9Sstevel@tonic-gate error = ENOENT; 6767c478bd9Sstevel@tonic-gate VN_RELE(vp); 6777c478bd9Sstevel@tonic-gate if (rootvp != rootdir) 6787c478bd9Sstevel@tonic-gate VN_RELE(rootvp); 679*da6c28aaSamw if (pp) 680*da6c28aaSamw pn_free(pp); 6817c478bd9Sstevel@tonic-gate return (error); 6827c478bd9Sstevel@tonic-gate } 6837c478bd9Sstevel@tonic-gate 6847c478bd9Sstevel@tonic-gate /* 6857c478bd9Sstevel@tonic-gate * Traverse a mount point. Routine accepts a vnode pointer as a reference 6867c478bd9Sstevel@tonic-gate * parameter and performs the indirection, releasing the original vnode. 6877c478bd9Sstevel@tonic-gate */ 6887c478bd9Sstevel@tonic-gate int 6897c478bd9Sstevel@tonic-gate traverse(vnode_t **cvpp) 6907c478bd9Sstevel@tonic-gate { 6917c478bd9Sstevel@tonic-gate int error = 0; 6927c478bd9Sstevel@tonic-gate vnode_t *cvp; 6937c478bd9Sstevel@tonic-gate vnode_t *tvp; 6947c478bd9Sstevel@tonic-gate vfs_t *vfsp; 6957c478bd9Sstevel@tonic-gate 6967c478bd9Sstevel@tonic-gate cvp = *cvpp; 6977c478bd9Sstevel@tonic-gate 6987c478bd9Sstevel@tonic-gate /* 6997c478bd9Sstevel@tonic-gate * If this vnode is mounted on, then we transparently indirect 7007c478bd9Sstevel@tonic-gate * to the vnode which is the root of the mounted file system. 7017c478bd9Sstevel@tonic-gate * Before we do this we must check that an unmount is not in 7027c478bd9Sstevel@tonic-gate * progress on this vnode. 7037c478bd9Sstevel@tonic-gate */ 7047c478bd9Sstevel@tonic-gate 7057c478bd9Sstevel@tonic-gate for (;;) { 7067c478bd9Sstevel@tonic-gate /* 7077c478bd9Sstevel@tonic-gate * Try to read lock the vnode. If this fails because 7087c478bd9Sstevel@tonic-gate * the vnode is already write locked, then check to 7097c478bd9Sstevel@tonic-gate * see whether it is the current thread which locked 7107c478bd9Sstevel@tonic-gate * the vnode. If it is not, then read lock the vnode 7117c478bd9Sstevel@tonic-gate * by waiting to acquire the lock. 7127c478bd9Sstevel@tonic-gate * 7137c478bd9Sstevel@tonic-gate * The code path in domount() is an example of support 7147c478bd9Sstevel@tonic-gate * which needs to look up two pathnames and locks one 7157c478bd9Sstevel@tonic-gate * of them in between the two lookups. 7167c478bd9Sstevel@tonic-gate */ 7177c478bd9Sstevel@tonic-gate error = vn_vfsrlock(cvp); 7187c478bd9Sstevel@tonic-gate if (error) { 7197c478bd9Sstevel@tonic-gate if (!vn_vfswlock_held(cvp)) 7207c478bd9Sstevel@tonic-gate error = vn_vfsrlock_wait(cvp); 7217c478bd9Sstevel@tonic-gate if (error != 0) { 7227c478bd9Sstevel@tonic-gate /* 7237c478bd9Sstevel@tonic-gate * lookuppn() expects a held vnode to be 7247c478bd9Sstevel@tonic-gate * returned because it promptly calls 7257c478bd9Sstevel@tonic-gate * VN_RELE after the error return 7267c478bd9Sstevel@tonic-gate */ 7277c478bd9Sstevel@tonic-gate *cvpp = cvp; 7287c478bd9Sstevel@tonic-gate return (error); 7297c478bd9Sstevel@tonic-gate } 7307c478bd9Sstevel@tonic-gate } 7317c478bd9Sstevel@tonic-gate 7327c478bd9Sstevel@tonic-gate /* 7337c478bd9Sstevel@tonic-gate * Reached the end of the mount chain? 7347c478bd9Sstevel@tonic-gate */ 7357c478bd9Sstevel@tonic-gate vfsp = vn_mountedvfs(cvp); 7367c478bd9Sstevel@tonic-gate if (vfsp == NULL) { 7377c478bd9Sstevel@tonic-gate vn_vfsunlock(cvp); 7387c478bd9Sstevel@tonic-gate break; 7397c478bd9Sstevel@tonic-gate } 7407c478bd9Sstevel@tonic-gate 7417c478bd9Sstevel@tonic-gate /* 7427c478bd9Sstevel@tonic-gate * The read lock must be held across the call to VFS_ROOT() to 7437c478bd9Sstevel@tonic-gate * prevent a concurrent unmount from destroying the vfs. 7447c478bd9Sstevel@tonic-gate */ 7457c478bd9Sstevel@tonic-gate error = VFS_ROOT(vfsp, &tvp); 7467c478bd9Sstevel@tonic-gate vn_vfsunlock(cvp); 7477c478bd9Sstevel@tonic-gate 7487c478bd9Sstevel@tonic-gate if (error) 7497c478bd9Sstevel@tonic-gate break; 7507c478bd9Sstevel@tonic-gate 7517c478bd9Sstevel@tonic-gate VN_RELE(cvp); 7527c478bd9Sstevel@tonic-gate 7537c478bd9Sstevel@tonic-gate cvp = tvp; 7547c478bd9Sstevel@tonic-gate } 7557c478bd9Sstevel@tonic-gate 7567c478bd9Sstevel@tonic-gate *cvpp = cvp; 7577c478bd9Sstevel@tonic-gate return (error); 7587c478bd9Sstevel@tonic-gate } 7597c478bd9Sstevel@tonic-gate 7607c478bd9Sstevel@tonic-gate /* 7617c478bd9Sstevel@tonic-gate * Return the lowermost vnode if this is a mountpoint. 7627c478bd9Sstevel@tonic-gate */ 7637c478bd9Sstevel@tonic-gate static vnode_t * 7647c478bd9Sstevel@tonic-gate vn_under(vnode_t *vp) 7657c478bd9Sstevel@tonic-gate { 7667c478bd9Sstevel@tonic-gate vnode_t *uvp; 7677c478bd9Sstevel@tonic-gate vfs_t *vfsp; 7687c478bd9Sstevel@tonic-gate 7697c478bd9Sstevel@tonic-gate while (vp->v_flag & VROOT) { 7707c478bd9Sstevel@tonic-gate 7717c478bd9Sstevel@tonic-gate vfsp = vp->v_vfsp; 7727c478bd9Sstevel@tonic-gate vfs_rlock_wait(vfsp); 7737c478bd9Sstevel@tonic-gate if ((uvp = vfsp->vfs_vnodecovered) == NULL || 7747c478bd9Sstevel@tonic-gate (vfsp->vfs_flag & VFS_UNMOUNTED)) { 7757c478bd9Sstevel@tonic-gate vfs_unlock(vfsp); 7767c478bd9Sstevel@tonic-gate break; 7777c478bd9Sstevel@tonic-gate } 7787c478bd9Sstevel@tonic-gate VN_HOLD(uvp); 7797c478bd9Sstevel@tonic-gate vfs_unlock(vfsp); 7807c478bd9Sstevel@tonic-gate VN_RELE(vp); 7817c478bd9Sstevel@tonic-gate vp = uvp; 7827c478bd9Sstevel@tonic-gate } 7837c478bd9Sstevel@tonic-gate 7847c478bd9Sstevel@tonic-gate return (vp); 7857c478bd9Sstevel@tonic-gate } 7867c478bd9Sstevel@tonic-gate 7877c478bd9Sstevel@tonic-gate static int 7887c478bd9Sstevel@tonic-gate vnode_match(vnode_t *v1, vnode_t *v2, cred_t *cr) 7897c478bd9Sstevel@tonic-gate { 7907c478bd9Sstevel@tonic-gate vattr_t v1attr, v2attr; 7917c478bd9Sstevel@tonic-gate 7927c478bd9Sstevel@tonic-gate /* 7937c478bd9Sstevel@tonic-gate * If we have a device file, check to see if is a cloned open of the 7947c478bd9Sstevel@tonic-gate * same device. For self-cloning devices, the major numbers will match. 7957c478bd9Sstevel@tonic-gate * For devices cloned through the 'clone' driver, the minor number of 7967c478bd9Sstevel@tonic-gate * the source device will be the same as the major number of the cloned 7977c478bd9Sstevel@tonic-gate * device. 7987c478bd9Sstevel@tonic-gate */ 7997c478bd9Sstevel@tonic-gate if ((v1->v_type == VCHR || v1->v_type == VBLK) && 8007c478bd9Sstevel@tonic-gate v1->v_type == v2->v_type) { 8017c478bd9Sstevel@tonic-gate if ((spec_is_selfclone(v1) || spec_is_selfclone(v2)) && 8027c478bd9Sstevel@tonic-gate getmajor(v1->v_rdev) == getmajor(v2->v_rdev)) 8037c478bd9Sstevel@tonic-gate return (1); 8047c478bd9Sstevel@tonic-gate 8057c478bd9Sstevel@tonic-gate if (spec_is_clone(v1) && 8067c478bd9Sstevel@tonic-gate getmajor(v1->v_rdev) == getminor(v2->v_rdev)) 8077c478bd9Sstevel@tonic-gate return (1); 8087c478bd9Sstevel@tonic-gate 8097c478bd9Sstevel@tonic-gate if (spec_is_clone(v2) && 8107c478bd9Sstevel@tonic-gate getmajor(v2->v_rdev) == getminor(v1->v_rdev)) 8117c478bd9Sstevel@tonic-gate return (1); 8127c478bd9Sstevel@tonic-gate } 8137c478bd9Sstevel@tonic-gate 8147c478bd9Sstevel@tonic-gate v1attr.va_mask = v2attr.va_mask = AT_TYPE; 8157c478bd9Sstevel@tonic-gate 8167c478bd9Sstevel@tonic-gate /* 8177c478bd9Sstevel@tonic-gate * This check for symbolic links handles the pseudo-symlinks in procfs. 8187c478bd9Sstevel@tonic-gate * These particular links have v_type of VDIR, but the attributes have a 8197c478bd9Sstevel@tonic-gate * type of VLNK. We need to avoid these links because otherwise if we 8207c478bd9Sstevel@tonic-gate * are currently in '/proc/self/fd', then '/proc/self/cwd' will compare 8217c478bd9Sstevel@tonic-gate * as the same vnode. 8227c478bd9Sstevel@tonic-gate */ 823*da6c28aaSamw if (VOP_GETATTR(v1, &v1attr, 0, cr, NULL) != 0 || 824*da6c28aaSamw VOP_GETATTR(v2, &v2attr, 0, cr, NULL) != 0 || 8257c478bd9Sstevel@tonic-gate v1attr.va_type == VLNK || v2attr.va_type == VLNK) 8267c478bd9Sstevel@tonic-gate return (0); 8277c478bd9Sstevel@tonic-gate 8287c478bd9Sstevel@tonic-gate v1attr.va_mask = v2attr.va_mask = AT_TYPE | AT_FSID | AT_NODEID; 8297c478bd9Sstevel@tonic-gate 830*da6c28aaSamw if (VOP_GETATTR(v1, &v1attr, ATTR_REAL, cr, NULL) != 0 || 831*da6c28aaSamw VOP_GETATTR(v2, &v2attr, ATTR_REAL, cr, NULL) != 0) 8327c478bd9Sstevel@tonic-gate return (0); 8337c478bd9Sstevel@tonic-gate 8347c478bd9Sstevel@tonic-gate return (v1attr.va_fsid == v2attr.va_fsid && 8357c478bd9Sstevel@tonic-gate v1attr.va_nodeid == v2attr.va_nodeid); 8367c478bd9Sstevel@tonic-gate } 8377c478bd9Sstevel@tonic-gate 8387c478bd9Sstevel@tonic-gate 8397c478bd9Sstevel@tonic-gate /* 8407c478bd9Sstevel@tonic-gate * Find the entry in the directory corresponding to the target vnode. 8417c478bd9Sstevel@tonic-gate */ 8427c478bd9Sstevel@tonic-gate int 8437c478bd9Sstevel@tonic-gate dirfindvp(vnode_t *vrootp, vnode_t *dvp, vnode_t *tvp, cred_t *cr, char *dbuf, 8447c478bd9Sstevel@tonic-gate size_t dlen, dirent64_t **rdp) 8457c478bd9Sstevel@tonic-gate { 8467c478bd9Sstevel@tonic-gate size_t dbuflen; 8477c478bd9Sstevel@tonic-gate struct iovec iov; 8487c478bd9Sstevel@tonic-gate struct uio uio; 849fa9e4066Sahrens int error; 8507c478bd9Sstevel@tonic-gate int eof; 8517c478bd9Sstevel@tonic-gate vnode_t *cmpvp; 8527c478bd9Sstevel@tonic-gate struct dirent64 *dp; 8537c478bd9Sstevel@tonic-gate pathname_t pnp; 8547c478bd9Sstevel@tonic-gate 8557c478bd9Sstevel@tonic-gate ASSERT(dvp->v_type == VDIR); 8567c478bd9Sstevel@tonic-gate 8577c478bd9Sstevel@tonic-gate /* 8587c478bd9Sstevel@tonic-gate * This is necessary because of the strange semantics of VOP_LOOKUP(). 8597c478bd9Sstevel@tonic-gate */ 8607c478bd9Sstevel@tonic-gate bzero(&pnp, sizeof (pnp)); 8617c478bd9Sstevel@tonic-gate 8627c478bd9Sstevel@tonic-gate eof = 0; 8637c478bd9Sstevel@tonic-gate 8647c478bd9Sstevel@tonic-gate uio.uio_iov = &iov; 8657c478bd9Sstevel@tonic-gate uio.uio_iovcnt = 1; 8667c478bd9Sstevel@tonic-gate uio.uio_segflg = UIO_SYSSPACE; 8677c478bd9Sstevel@tonic-gate uio.uio_fmode = 0; 8687c478bd9Sstevel@tonic-gate uio.uio_extflg = UIO_COPY_CACHED; 8697c478bd9Sstevel@tonic-gate uio.uio_loffset = 0; 8707c478bd9Sstevel@tonic-gate 871*da6c28aaSamw if ((error = VOP_ACCESS(dvp, VREAD, 0, cr, NULL)) != 0) 872fa9e4066Sahrens return (error); 8737c478bd9Sstevel@tonic-gate 8747c478bd9Sstevel@tonic-gate while (!eof) { 8757c478bd9Sstevel@tonic-gate uio.uio_resid = dlen; 8767c478bd9Sstevel@tonic-gate iov.iov_base = dbuf; 8777c478bd9Sstevel@tonic-gate iov.iov_len = dlen; 8787c478bd9Sstevel@tonic-gate 8797c478bd9Sstevel@tonic-gate (void) VOP_RWLOCK(dvp, V_WRITELOCK_FALSE, NULL); 880*da6c28aaSamw error = VOP_READDIR(dvp, &uio, cr, &eof, NULL, 0); 8817c478bd9Sstevel@tonic-gate VOP_RWUNLOCK(dvp, V_WRITELOCK_FALSE, NULL); 8827c478bd9Sstevel@tonic-gate 8837c478bd9Sstevel@tonic-gate dbuflen = dlen - uio.uio_resid; 8847c478bd9Sstevel@tonic-gate 885fa9e4066Sahrens if (error || dbuflen == 0) 8867c478bd9Sstevel@tonic-gate break; 8877c478bd9Sstevel@tonic-gate 8887c478bd9Sstevel@tonic-gate dp = (dirent64_t *)dbuf; 8897c478bd9Sstevel@tonic-gate while ((intptr_t)dp < (intptr_t)dbuf + dbuflen) { 8907c478bd9Sstevel@tonic-gate /* 8917c478bd9Sstevel@tonic-gate * Ignore '.' and '..' entries 8927c478bd9Sstevel@tonic-gate */ 8937c478bd9Sstevel@tonic-gate if (strcmp(dp->d_name, ".") == 0 || 8947c478bd9Sstevel@tonic-gate strcmp(dp->d_name, "..") == 0) { 8957c478bd9Sstevel@tonic-gate dp = (dirent64_t *)((intptr_t)dp + 8967c478bd9Sstevel@tonic-gate dp->d_reclen); 8977c478bd9Sstevel@tonic-gate continue; 8987c478bd9Sstevel@tonic-gate } 8997c478bd9Sstevel@tonic-gate 900fa9e4066Sahrens error = VOP_LOOKUP(dvp, dp->d_name, &cmpvp, &pnp, 0, 901*da6c28aaSamw vrootp, cr, NULL, NULL, NULL); 9027c478bd9Sstevel@tonic-gate 9037c478bd9Sstevel@tonic-gate /* 9047c478bd9Sstevel@tonic-gate * We only want to bail out if there was an error other 9057c478bd9Sstevel@tonic-gate * than ENOENT. Otherwise, it could be that someone 9067c478bd9Sstevel@tonic-gate * just removed an entry since the readdir() call, and 9077c478bd9Sstevel@tonic-gate * the entry we want is further on in the directory. 9087c478bd9Sstevel@tonic-gate */ 909fa9e4066Sahrens if (error == 0) { 9107c478bd9Sstevel@tonic-gate if (vnode_match(tvp, cmpvp, cr)) { 9117c478bd9Sstevel@tonic-gate VN_RELE(cmpvp); 9127c478bd9Sstevel@tonic-gate *rdp = dp; 9137c478bd9Sstevel@tonic-gate return (0); 9147c478bd9Sstevel@tonic-gate } 9157c478bd9Sstevel@tonic-gate 9167c478bd9Sstevel@tonic-gate VN_RELE(cmpvp); 917fa9e4066Sahrens } else if (error != ENOENT) { 918fa9e4066Sahrens return (error); 9197c478bd9Sstevel@tonic-gate } 9207c478bd9Sstevel@tonic-gate 9217c478bd9Sstevel@tonic-gate dp = (dirent64_t *)((intptr_t)dp + dp->d_reclen); 9227c478bd9Sstevel@tonic-gate } 9237c478bd9Sstevel@tonic-gate } 9247c478bd9Sstevel@tonic-gate 9257c478bd9Sstevel@tonic-gate /* 9267c478bd9Sstevel@tonic-gate * Something strange has happened, this directory does not contain the 9277c478bd9Sstevel@tonic-gate * specified vnode. This should never happen in the normal case, since 928fa9e4066Sahrens * we ensured that dvp is the parent of vp. This is possible in some 929fa9e4066Sahrens * rare conditions (races and the special .zfs directory). 9307c478bd9Sstevel@tonic-gate */ 931fa9e4066Sahrens if (error == 0) { 932*da6c28aaSamw error = VOP_LOOKUP(dvp, ".zfs", &cmpvp, &pnp, 0, vrootp, cr, 933*da6c28aaSamw NULL, NULL, NULL); 934fa9e4066Sahrens if (error == 0) { 935fa9e4066Sahrens if (vnode_match(tvp, cmpvp, cr)) { 936fa9e4066Sahrens (void) strcpy(dp->d_name, ".zfs"); 937fa9e4066Sahrens dp->d_reclen = strlen(".zfs"); 938fa9e4066Sahrens dp->d_off = 2; 939fa9e4066Sahrens dp->d_ino = 1; 940fa9e4066Sahrens *rdp = dp; 941fa9e4066Sahrens } else { 942fa9e4066Sahrens error = ENOENT; 943fa9e4066Sahrens } 944fa9e4066Sahrens VN_RELE(cmpvp); 945fa9e4066Sahrens } 946fa9e4066Sahrens } 9477c478bd9Sstevel@tonic-gate 948fa9e4066Sahrens return (error); 9497c478bd9Sstevel@tonic-gate } 9507c478bd9Sstevel@tonic-gate 9517c478bd9Sstevel@tonic-gate /* 9527c478bd9Sstevel@tonic-gate * Given a global path (from rootdir), and a vnode that is the current root, 9537c478bd9Sstevel@tonic-gate * return the portion of the path that is beneath the current root or NULL on 9547c478bd9Sstevel@tonic-gate * failure. The path MUST be a resolved path (no '..' entries or symlinks), 9557c478bd9Sstevel@tonic-gate * otherwise this function will fail. 9567c478bd9Sstevel@tonic-gate */ 9577c478bd9Sstevel@tonic-gate static char * 9587c478bd9Sstevel@tonic-gate localpath(char *path, struct vnode *vrootp, cred_t *cr) 9597c478bd9Sstevel@tonic-gate { 9607c478bd9Sstevel@tonic-gate vnode_t *vp; 9617c478bd9Sstevel@tonic-gate vnode_t *cvp; 9627c478bd9Sstevel@tonic-gate char component[MAXNAMELEN]; 9637c478bd9Sstevel@tonic-gate char *ret = NULL; 9647c478bd9Sstevel@tonic-gate pathname_t pn; 9657c478bd9Sstevel@tonic-gate 9667c478bd9Sstevel@tonic-gate /* 9677c478bd9Sstevel@tonic-gate * We use vn_compare() instead of VN_CMP() in order to detect lofs 9687c478bd9Sstevel@tonic-gate * mounts and stacked vnodes. 9697c478bd9Sstevel@tonic-gate */ 9707c478bd9Sstevel@tonic-gate if (vn_compare(vrootp, rootdir)) 9717c478bd9Sstevel@tonic-gate return (path); 9727c478bd9Sstevel@tonic-gate 9737c478bd9Sstevel@tonic-gate if (pn_get(path, UIO_SYSSPACE, &pn) != 0) 9747c478bd9Sstevel@tonic-gate return (NULL); 9757c478bd9Sstevel@tonic-gate 9767c478bd9Sstevel@tonic-gate vp = rootdir; 9777c478bd9Sstevel@tonic-gate VN_HOLD(vp); 9787c478bd9Sstevel@tonic-gate 9797c478bd9Sstevel@tonic-gate while (pn_pathleft(&pn)) { 9807c478bd9Sstevel@tonic-gate pn_skipslash(&pn); 9817c478bd9Sstevel@tonic-gate 9827c478bd9Sstevel@tonic-gate if (pn_getcomponent(&pn, component) != 0) 9837c478bd9Sstevel@tonic-gate break; 9847c478bd9Sstevel@tonic-gate 9857c478bd9Sstevel@tonic-gate if (vn_ismntpt(vp) && traverse(&vp) != 0) 9867c478bd9Sstevel@tonic-gate break; 9877c478bd9Sstevel@tonic-gate 988*da6c28aaSamw if (VOP_LOOKUP(vp, component, &cvp, &pn, 0, rootdir, cr, 989*da6c28aaSamw NULL, NULL, NULL) != 0) 9907c478bd9Sstevel@tonic-gate break; 9917c478bd9Sstevel@tonic-gate 9927c478bd9Sstevel@tonic-gate VN_RELE(vp); 9937c478bd9Sstevel@tonic-gate vp = cvp; 9947c478bd9Sstevel@tonic-gate 9957c478bd9Sstevel@tonic-gate if (vn_compare(vp, vrootp)) { 9967c478bd9Sstevel@tonic-gate ret = path + (pn.pn_path - pn.pn_buf); 9977c478bd9Sstevel@tonic-gate break; 9987c478bd9Sstevel@tonic-gate } 9997c478bd9Sstevel@tonic-gate } 10007c478bd9Sstevel@tonic-gate 10017c478bd9Sstevel@tonic-gate VN_RELE(vp); 10027c478bd9Sstevel@tonic-gate pn_free(&pn); 10037c478bd9Sstevel@tonic-gate 10047c478bd9Sstevel@tonic-gate return (ret); 10057c478bd9Sstevel@tonic-gate } 10067c478bd9Sstevel@tonic-gate 10077c478bd9Sstevel@tonic-gate /* 10087c478bd9Sstevel@tonic-gate * Given a directory, return the full, resolved path. This looks up "..", 10097c478bd9Sstevel@tonic-gate * searches for the given vnode in the parent, appends the component, etc. It 10107c478bd9Sstevel@tonic-gate * is used to implement vnodetopath() and getcwd() when the cached path fails 10117c478bd9Sstevel@tonic-gate * (or vfs_vnode_path is not set). 10127c478bd9Sstevel@tonic-gate */ 10137c478bd9Sstevel@tonic-gate static int 10147c478bd9Sstevel@tonic-gate dirtopath(vnode_t *vrootp, vnode_t *vp, char *buf, size_t buflen, cred_t *cr) 10157c478bd9Sstevel@tonic-gate { 10167c478bd9Sstevel@tonic-gate pathname_t pn, rpn, emptypn; 10177c478bd9Sstevel@tonic-gate vnode_t *cmpvp, *pvp = NULL; 10187c478bd9Sstevel@tonic-gate vnode_t *startvp = vp; 10197c478bd9Sstevel@tonic-gate int err = 0; 10207c478bd9Sstevel@tonic-gate size_t complen; 10217c478bd9Sstevel@tonic-gate char *dbuf; 10227c478bd9Sstevel@tonic-gate dirent64_t *dp; 10237c478bd9Sstevel@tonic-gate char *bufloc; 10247c478bd9Sstevel@tonic-gate size_t dlen = DIRENT64_RECLEN(MAXPATHLEN); 10257c478bd9Sstevel@tonic-gate refstr_t *mntpt; 10267c478bd9Sstevel@tonic-gate 10277c478bd9Sstevel@tonic-gate /* Operation only allowed on directories */ 10287c478bd9Sstevel@tonic-gate ASSERT(vp->v_type == VDIR); 10297c478bd9Sstevel@tonic-gate 10307c478bd9Sstevel@tonic-gate /* We must have at least enough space for "/" */ 10317c478bd9Sstevel@tonic-gate if (buflen < 2) 10327c478bd9Sstevel@tonic-gate return (ENAMETOOLONG); 10337c478bd9Sstevel@tonic-gate 10347c478bd9Sstevel@tonic-gate /* Start at end of string with terminating null */ 10357c478bd9Sstevel@tonic-gate bufloc = &buf[buflen - 1]; 10367c478bd9Sstevel@tonic-gate *bufloc = '\0'; 10377c478bd9Sstevel@tonic-gate 10387c478bd9Sstevel@tonic-gate pn_alloc(&pn); 10397c478bd9Sstevel@tonic-gate pn_alloc(&rpn); 10407c478bd9Sstevel@tonic-gate dbuf = kmem_alloc(dlen, KM_SLEEP); 10417c478bd9Sstevel@tonic-gate bzero(&emptypn, sizeof (emptypn)); 10427c478bd9Sstevel@tonic-gate 10437c478bd9Sstevel@tonic-gate /* 10447c478bd9Sstevel@tonic-gate * Begin with an additional reference on vp. This will be decremented 10457c478bd9Sstevel@tonic-gate * during the loop. 10467c478bd9Sstevel@tonic-gate */ 10477c478bd9Sstevel@tonic-gate VN_HOLD(vp); 10487c478bd9Sstevel@tonic-gate 10497c478bd9Sstevel@tonic-gate for (;;) { 10507c478bd9Sstevel@tonic-gate /* 10517c478bd9Sstevel@tonic-gate * Return if we've reached the root. If the buffer is empty, 10527c478bd9Sstevel@tonic-gate * return '/'. We explicitly don't use vn_compare(), since it 10537c478bd9Sstevel@tonic-gate * compares the real vnodes. A lofs mount of '/' would produce 10547c478bd9Sstevel@tonic-gate * incorrect results otherwise. 10557c478bd9Sstevel@tonic-gate */ 10567c478bd9Sstevel@tonic-gate if (VN_CMP(vrootp, vp)) { 10577c478bd9Sstevel@tonic-gate if (*bufloc == '\0') 10587c478bd9Sstevel@tonic-gate *--bufloc = '/'; 10597c478bd9Sstevel@tonic-gate break; 10607c478bd9Sstevel@tonic-gate } 10617c478bd9Sstevel@tonic-gate 10627c478bd9Sstevel@tonic-gate /* 10637c478bd9Sstevel@tonic-gate * If we've reached the VFS root, something has gone wrong. We 10647c478bd9Sstevel@tonic-gate * should have reached the root in the above check. The only 10657c478bd9Sstevel@tonic-gate * explantation is that 'vp' is not contained withing the given 10667c478bd9Sstevel@tonic-gate * root, in which case we return EPERM. 10677c478bd9Sstevel@tonic-gate */ 10687c478bd9Sstevel@tonic-gate if (VN_CMP(rootdir, vp)) { 10697c478bd9Sstevel@tonic-gate err = EPERM; 10707c478bd9Sstevel@tonic-gate goto out; 10717c478bd9Sstevel@tonic-gate } 10727c478bd9Sstevel@tonic-gate 10737c478bd9Sstevel@tonic-gate /* 10747c478bd9Sstevel@tonic-gate * Shortcut: see if this vnode is a mountpoint. If so, 10757c478bd9Sstevel@tonic-gate * grab the path information from the vfs_t. 10767c478bd9Sstevel@tonic-gate */ 10777c478bd9Sstevel@tonic-gate if (vp->v_flag & VROOT) { 10787c478bd9Sstevel@tonic-gate 10797c478bd9Sstevel@tonic-gate mntpt = vfs_getmntpoint(vp->v_vfsp); 10807c478bd9Sstevel@tonic-gate if ((err = pn_set(&pn, (char *)refstr_value(mntpt))) 10817c478bd9Sstevel@tonic-gate == 0) { 10827c478bd9Sstevel@tonic-gate refstr_rele(mntpt); 10837c478bd9Sstevel@tonic-gate rpn.pn_path = rpn.pn_buf; 10847c478bd9Sstevel@tonic-gate 10857c478bd9Sstevel@tonic-gate /* 10867c478bd9Sstevel@tonic-gate * Ensure the mointpoint still exists. 10877c478bd9Sstevel@tonic-gate */ 10887c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 10897c478bd9Sstevel@tonic-gate if (vrootp != rootdir) 10907c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 10917c478bd9Sstevel@tonic-gate if (lookuppnvp(&pn, &rpn, 0, NULL, 10927c478bd9Sstevel@tonic-gate &cmpvp, vrootp, vrootp, cr) == 0) { 10937c478bd9Sstevel@tonic-gate 10947c478bd9Sstevel@tonic-gate if (VN_CMP(vp, cmpvp)) { 10957c478bd9Sstevel@tonic-gate VN_RELE(cmpvp); 10967c478bd9Sstevel@tonic-gate 10977c478bd9Sstevel@tonic-gate complen = strlen(rpn.pn_path); 10987c478bd9Sstevel@tonic-gate bufloc -= complen; 10997c478bd9Sstevel@tonic-gate if (bufloc < buf) { 11007c478bd9Sstevel@tonic-gate err = ERANGE; 11017c478bd9Sstevel@tonic-gate goto out; 11027c478bd9Sstevel@tonic-gate } 11037c478bd9Sstevel@tonic-gate bcopy(rpn.pn_path, bufloc, 11047c478bd9Sstevel@tonic-gate complen); 11057c478bd9Sstevel@tonic-gate break; 11067c478bd9Sstevel@tonic-gate } else { 11077c478bd9Sstevel@tonic-gate VN_RELE(cmpvp); 11087c478bd9Sstevel@tonic-gate } 11097c478bd9Sstevel@tonic-gate } 11107c478bd9Sstevel@tonic-gate } else { 11117c478bd9Sstevel@tonic-gate refstr_rele(mntpt); 11127c478bd9Sstevel@tonic-gate } 11137c478bd9Sstevel@tonic-gate } 11147c478bd9Sstevel@tonic-gate 11157c478bd9Sstevel@tonic-gate /* 11167c478bd9Sstevel@tonic-gate * Shortcuts failed, search for this vnode in its parent. If 11177c478bd9Sstevel@tonic-gate * this is a mountpoint, then get the vnode underneath. 11187c478bd9Sstevel@tonic-gate */ 11197c478bd9Sstevel@tonic-gate if (vp->v_flag & VROOT) 11207c478bd9Sstevel@tonic-gate vp = vn_under(vp); 1121*da6c28aaSamw if ((err = VOP_LOOKUP(vp, "..", &pvp, &emptypn, 0, vrootp, cr, 1122*da6c28aaSamw NULL, NULL, NULL)) != 0) 11237c478bd9Sstevel@tonic-gate goto out; 11247c478bd9Sstevel@tonic-gate 11257c478bd9Sstevel@tonic-gate /* 11267c478bd9Sstevel@tonic-gate * With extended attributes, it's possible for a directory to 11277c478bd9Sstevel@tonic-gate * have a parent that is a regular file. Check for that here. 11287c478bd9Sstevel@tonic-gate */ 11297c478bd9Sstevel@tonic-gate if (pvp->v_type != VDIR) { 11307c478bd9Sstevel@tonic-gate err = ENOTDIR; 11317c478bd9Sstevel@tonic-gate goto out; 11327c478bd9Sstevel@tonic-gate } 11337c478bd9Sstevel@tonic-gate 11347c478bd9Sstevel@tonic-gate /* 11357c478bd9Sstevel@tonic-gate * If this is true, something strange has happened. This is 11367c478bd9Sstevel@tonic-gate * only true if we are the root of a filesystem, which should 11377c478bd9Sstevel@tonic-gate * have been caught by the check above. 11387c478bd9Sstevel@tonic-gate */ 11397c478bd9Sstevel@tonic-gate if (VN_CMP(pvp, vp)) { 11407c478bd9Sstevel@tonic-gate err = ENOENT; 11417c478bd9Sstevel@tonic-gate goto out; 11427c478bd9Sstevel@tonic-gate } 11437c478bd9Sstevel@tonic-gate 11447c478bd9Sstevel@tonic-gate /* 11457c478bd9Sstevel@tonic-gate * Search the parent directory for the entry corresponding to 11467c478bd9Sstevel@tonic-gate * this vnode. 11477c478bd9Sstevel@tonic-gate */ 11487c478bd9Sstevel@tonic-gate if ((err = dirfindvp(vrootp, pvp, vp, cr, dbuf, dlen, &dp)) 11497c478bd9Sstevel@tonic-gate != 0) 11507c478bd9Sstevel@tonic-gate goto out; 11517c478bd9Sstevel@tonic-gate complen = strlen(dp->d_name); 11527c478bd9Sstevel@tonic-gate bufloc -= complen; 11537c478bd9Sstevel@tonic-gate if (bufloc <= buf) { 11547c478bd9Sstevel@tonic-gate err = ENAMETOOLONG; 11557c478bd9Sstevel@tonic-gate goto out; 11567c478bd9Sstevel@tonic-gate } 11577c478bd9Sstevel@tonic-gate bcopy(dp->d_name, bufloc, complen); 11587c478bd9Sstevel@tonic-gate 11597c478bd9Sstevel@tonic-gate /* Prepend a slash to the current path. */ 11607c478bd9Sstevel@tonic-gate *--bufloc = '/'; 11617c478bd9Sstevel@tonic-gate 11627c478bd9Sstevel@tonic-gate /* And continue with the next component */ 11637c478bd9Sstevel@tonic-gate VN_RELE(vp); 11647c478bd9Sstevel@tonic-gate vp = pvp; 11657c478bd9Sstevel@tonic-gate pvp = NULL; 11667c478bd9Sstevel@tonic-gate } 11677c478bd9Sstevel@tonic-gate 11687c478bd9Sstevel@tonic-gate /* 11697c478bd9Sstevel@tonic-gate * Place the path at the beginning of the buffer. 11707c478bd9Sstevel@tonic-gate */ 11717c478bd9Sstevel@tonic-gate if (bufloc != buf) 11727c478bd9Sstevel@tonic-gate ovbcopy(bufloc, buf, buflen - (bufloc - buf)); 11737c478bd9Sstevel@tonic-gate 11747c478bd9Sstevel@tonic-gate out: 11757c478bd9Sstevel@tonic-gate /* 11767c478bd9Sstevel@tonic-gate * If the error was ESTALE and the current directory to look in 11777c478bd9Sstevel@tonic-gate * was the root for this lookup, the root for a mounted file 11787c478bd9Sstevel@tonic-gate * system, or the starting directory for lookups, then 11797c478bd9Sstevel@tonic-gate * return ENOENT instead of ESTALE. In this case, no recovery 11807c478bd9Sstevel@tonic-gate * is possible by the higher level. If ESTALE was returned for 11817c478bd9Sstevel@tonic-gate * some intermediate directory along the path, then recovery 11827c478bd9Sstevel@tonic-gate * is potentially possible and retrying from the higher level 11837c478bd9Sstevel@tonic-gate * will either correct the situation by purging stale cache 11847c478bd9Sstevel@tonic-gate * entries or eventually get back to the point where no recovery 11857c478bd9Sstevel@tonic-gate * is possible. 11867c478bd9Sstevel@tonic-gate */ 11877c478bd9Sstevel@tonic-gate if (err == ESTALE && 11887c478bd9Sstevel@tonic-gate (VN_CMP(vp, vrootp) || (vp->v_flag & VROOT) || vp == startvp)) 11897c478bd9Sstevel@tonic-gate err = ENOENT; 11907c478bd9Sstevel@tonic-gate 11917c478bd9Sstevel@tonic-gate kmem_free(dbuf, dlen); 11927c478bd9Sstevel@tonic-gate VN_RELE(vp); 11937c478bd9Sstevel@tonic-gate if (pvp) 11947c478bd9Sstevel@tonic-gate VN_RELE(pvp); 11957c478bd9Sstevel@tonic-gate pn_free(&pn); 11967c478bd9Sstevel@tonic-gate pn_free(&rpn); 11977c478bd9Sstevel@tonic-gate 11987c478bd9Sstevel@tonic-gate return (err); 11997c478bd9Sstevel@tonic-gate } 12007c478bd9Sstevel@tonic-gate 12017c478bd9Sstevel@tonic-gate /* 12027c478bd9Sstevel@tonic-gate * The additional flag, LOOKUP_CHECKREAD, is ued to enforce artificial 12037c478bd9Sstevel@tonic-gate * constraints in order to be standards compliant. For example, if we have 12047c478bd9Sstevel@tonic-gate * the cached path of '/foo/bar', and '/foo' has permissions 100 (execute 12057c478bd9Sstevel@tonic-gate * only), then we can legitimately look up the path to the current working 12067c478bd9Sstevel@tonic-gate * directory without needing read permission. Existing standards tests, 12077c478bd9Sstevel@tonic-gate * however, assume that we are determining the path by repeatedly looking up 12087c478bd9Sstevel@tonic-gate * "..". We need to keep this behavior in order to maintain backwards 12097c478bd9Sstevel@tonic-gate * compatibility. 12107c478bd9Sstevel@tonic-gate */ 12117c478bd9Sstevel@tonic-gate static int 12127c478bd9Sstevel@tonic-gate vnodetopath_common(vnode_t *vrootp, vnode_t *vp, char *buf, size_t buflen, 12137c478bd9Sstevel@tonic-gate cred_t *cr, int flags) 12147c478bd9Sstevel@tonic-gate { 12157c478bd9Sstevel@tonic-gate pathname_t pn, rpn; 12167c478bd9Sstevel@tonic-gate int ret, len; 12177c478bd9Sstevel@tonic-gate vnode_t *compvp, *pvp, *realvp; 12187c478bd9Sstevel@tonic-gate proc_t *p = curproc; 12197c478bd9Sstevel@tonic-gate char path[MAXNAMELEN]; 12207c478bd9Sstevel@tonic-gate int doclose = 0; 12217c478bd9Sstevel@tonic-gate 12227c478bd9Sstevel@tonic-gate /* 12237c478bd9Sstevel@tonic-gate * If vrootp is NULL, get the root for curproc. Callers with any other 12247c478bd9Sstevel@tonic-gate * requirements should pass in a different vrootp. 12257c478bd9Sstevel@tonic-gate */ 12267c478bd9Sstevel@tonic-gate if (vrootp == NULL) { 12277c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 12287c478bd9Sstevel@tonic-gate if ((vrootp = PTOU(p)->u_rdir) == NULL) 12297c478bd9Sstevel@tonic-gate vrootp = rootdir; 12307c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 12317c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 12327c478bd9Sstevel@tonic-gate } else { 12337c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 12347c478bd9Sstevel@tonic-gate } 12357c478bd9Sstevel@tonic-gate 12367c478bd9Sstevel@tonic-gate /* 12377c478bd9Sstevel@tonic-gate * This is to get around an annoying artifact of the /proc filesystem, 12387c478bd9Sstevel@tonic-gate * which is the behavior of {cwd/root}. Trying to resolve this path 12397c478bd9Sstevel@tonic-gate * will result in /proc/pid/cwd instead of whatever the real working 12407c478bd9Sstevel@tonic-gate * directory is. We can't rely on VOP_REALVP(), since that will break 12417c478bd9Sstevel@tonic-gate * lofs. The only difference between procfs and lofs is that opening 12427c478bd9Sstevel@tonic-gate * the file will return the underling vnode in the case of procfs. 12437c478bd9Sstevel@tonic-gate */ 1244*da6c28aaSamw if (vp->v_type == VDIR && VOP_REALVP(vp, &realvp, NULL) == 0 && 12457c478bd9Sstevel@tonic-gate realvp != vp) { 12467c478bd9Sstevel@tonic-gate VN_HOLD(vp); 1247*da6c28aaSamw if (VOP_OPEN(&vp, FREAD, cr, NULL) == 0) 12487c478bd9Sstevel@tonic-gate doclose = 1; 12497c478bd9Sstevel@tonic-gate else 12507c478bd9Sstevel@tonic-gate VN_RELE(vp); 12517c478bd9Sstevel@tonic-gate } 12527c478bd9Sstevel@tonic-gate 12537c478bd9Sstevel@tonic-gate pn_alloc(&pn); 12547c478bd9Sstevel@tonic-gate 12557c478bd9Sstevel@tonic-gate /* 12567c478bd9Sstevel@tonic-gate * Check to see if we have a cached path in the vnode. 12577c478bd9Sstevel@tonic-gate */ 12587c478bd9Sstevel@tonic-gate mutex_enter(&vp->v_lock); 1259ca2c3138Seschrock if (vp->v_path != NULL) { 1260ca2c3138Seschrock (void) pn_set(&pn, vp->v_path); 12617c478bd9Sstevel@tonic-gate mutex_exit(&vp->v_lock); 12627c478bd9Sstevel@tonic-gate 12637c478bd9Sstevel@tonic-gate pn_alloc(&rpn); 12647c478bd9Sstevel@tonic-gate 12657c478bd9Sstevel@tonic-gate /* We should only cache absolute paths */ 12667c478bd9Sstevel@tonic-gate ASSERT(pn.pn_buf[0] == '/'); 12677c478bd9Sstevel@tonic-gate 12687c478bd9Sstevel@tonic-gate /* 12697c478bd9Sstevel@tonic-gate * If we are in a zone or a chroot environment, then we have to 12707c478bd9Sstevel@tonic-gate * take additional steps, since the path to the root might not 12717c478bd9Sstevel@tonic-gate * be readable with the current credentials, even though the 12727c478bd9Sstevel@tonic-gate * process can legitmately access the file. In this case, we 12737c478bd9Sstevel@tonic-gate * do the following: 12747c478bd9Sstevel@tonic-gate * 12757c478bd9Sstevel@tonic-gate * lookuppnvp() with all privileges to get the resolved path. 12767c478bd9Sstevel@tonic-gate * call localpath() to get the local portion of the path, and 12777c478bd9Sstevel@tonic-gate * continue as normal. 12787c478bd9Sstevel@tonic-gate * 12797c478bd9Sstevel@tonic-gate * If the the conversion to a local path fails, then we continue 12807c478bd9Sstevel@tonic-gate * as normal. This is a heuristic to make process object file 12817c478bd9Sstevel@tonic-gate * paths available from within a zone. Because lofs doesn't 12827c478bd9Sstevel@tonic-gate * support page operations, the vnode stored in the seg_t is 12837c478bd9Sstevel@tonic-gate * actually the underlying real vnode, not the lofs node itself. 12847c478bd9Sstevel@tonic-gate * Most of the time, the lofs path is the same as the underlying 12857c478bd9Sstevel@tonic-gate * vnode (for example, /usr/lib/libc.so.1). 12867c478bd9Sstevel@tonic-gate */ 12877c478bd9Sstevel@tonic-gate if (vrootp != rootdir) { 12887c478bd9Sstevel@tonic-gate char *local = NULL; 12897c478bd9Sstevel@tonic-gate VN_HOLD(rootdir); 12907c478bd9Sstevel@tonic-gate if (lookuppnvp(&pn, &rpn, FOLLOW, 12917c478bd9Sstevel@tonic-gate NULL, &compvp, rootdir, rootdir, kcred) == 0) { 12927c478bd9Sstevel@tonic-gate local = localpath(rpn.pn_path, vrootp, 12937c478bd9Sstevel@tonic-gate kcred); 12947c478bd9Sstevel@tonic-gate VN_RELE(compvp); 12957c478bd9Sstevel@tonic-gate } 12967c478bd9Sstevel@tonic-gate 12977c478bd9Sstevel@tonic-gate /* 12987c478bd9Sstevel@tonic-gate * The original pn was changed through lookuppnvp(), so 12997c478bd9Sstevel@tonic-gate * reset it. 13007c478bd9Sstevel@tonic-gate */ 13017c478bd9Sstevel@tonic-gate if (local) { 13027c478bd9Sstevel@tonic-gate (void) pn_set(&pn, local); 13037c478bd9Sstevel@tonic-gate } else { 13047c478bd9Sstevel@tonic-gate mutex_enter(&vp->v_lock); 1305ca2c3138Seschrock if (vp->v_path != NULL) { 1306ca2c3138Seschrock (void) pn_set(&pn, vp->v_path); 13077c478bd9Sstevel@tonic-gate mutex_exit(&vp->v_lock); 13087c478bd9Sstevel@tonic-gate } else { 13097c478bd9Sstevel@tonic-gate mutex_exit(&vp->v_lock); 13107c478bd9Sstevel@tonic-gate goto notcached; 13117c478bd9Sstevel@tonic-gate } 13127c478bd9Sstevel@tonic-gate } 13137c478bd9Sstevel@tonic-gate } 13147c478bd9Sstevel@tonic-gate 13157c478bd9Sstevel@tonic-gate /* 13167c478bd9Sstevel@tonic-gate * We should have a local path at this point, so start the 13177c478bd9Sstevel@tonic-gate * search from the root of the current process. 13187c478bd9Sstevel@tonic-gate */ 13197c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 13207c478bd9Sstevel@tonic-gate if (vrootp != rootdir) 13217c478bd9Sstevel@tonic-gate VN_HOLD(vrootp); 13227c478bd9Sstevel@tonic-gate ret = lookuppnvp(&pn, &rpn, FOLLOW | flags, NULL, 13237c478bd9Sstevel@tonic-gate &compvp, vrootp, vrootp, cr); 13247c478bd9Sstevel@tonic-gate if (ret == 0) { 13257c478bd9Sstevel@tonic-gate /* 13267c478bd9Sstevel@tonic-gate * Check to see if the returned vnode is the same as 13277c478bd9Sstevel@tonic-gate * the one we expect. If not, give up. 13287c478bd9Sstevel@tonic-gate */ 13297c478bd9Sstevel@tonic-gate if (!vn_compare(vp, compvp) && 13307c478bd9Sstevel@tonic-gate !vnode_match(vp, compvp, cr)) { 13317c478bd9Sstevel@tonic-gate VN_RELE(compvp); 13327c478bd9Sstevel@tonic-gate goto notcached; 13337c478bd9Sstevel@tonic-gate } 13347c478bd9Sstevel@tonic-gate 13357c478bd9Sstevel@tonic-gate VN_RELE(compvp); 13367c478bd9Sstevel@tonic-gate 13377c478bd9Sstevel@tonic-gate /* 13387c478bd9Sstevel@tonic-gate * Return the result. 13397c478bd9Sstevel@tonic-gate */ 13407c478bd9Sstevel@tonic-gate if (buflen <= rpn.pn_pathlen) 13417c478bd9Sstevel@tonic-gate goto notcached; 13427c478bd9Sstevel@tonic-gate 13437c478bd9Sstevel@tonic-gate bcopy(rpn.pn_path, buf, rpn.pn_pathlen + 1); 13447c478bd9Sstevel@tonic-gate pn_free(&pn); 13457c478bd9Sstevel@tonic-gate pn_free(&rpn); 13467c478bd9Sstevel@tonic-gate VN_RELE(vrootp); 13477c478bd9Sstevel@tonic-gate if (doclose) { 1348*da6c28aaSamw (void) VOP_CLOSE(vp, FREAD, 1, 0, cr, NULL); 13497c478bd9Sstevel@tonic-gate VN_RELE(vp); 13507c478bd9Sstevel@tonic-gate } 13517c478bd9Sstevel@tonic-gate return (0); 13527c478bd9Sstevel@tonic-gate } 13537c478bd9Sstevel@tonic-gate 13547c478bd9Sstevel@tonic-gate notcached: 13557c478bd9Sstevel@tonic-gate pn_free(&rpn); 13567c478bd9Sstevel@tonic-gate } else { 13577c478bd9Sstevel@tonic-gate mutex_exit(&vp->v_lock); 13587c478bd9Sstevel@tonic-gate } 13597c478bd9Sstevel@tonic-gate 13607c478bd9Sstevel@tonic-gate pn_free(&pn); 13617c478bd9Sstevel@tonic-gate 13627c478bd9Sstevel@tonic-gate if (vp->v_type != VDIR) { 13637c478bd9Sstevel@tonic-gate /* 13647c478bd9Sstevel@tonic-gate * If we don't have a directory, try to find it in the dnlc via 13657c478bd9Sstevel@tonic-gate * reverse lookup. Once this is found, we can use the regular 13667c478bd9Sstevel@tonic-gate * directory search to find the full path. 13677c478bd9Sstevel@tonic-gate */ 13687c478bd9Sstevel@tonic-gate if ((pvp = dnlc_reverse_lookup(vp, path, MAXNAMELEN)) != NULL) { 13697c478bd9Sstevel@tonic-gate ret = dirtopath(vrootp, pvp, buf, buflen, cr); 13707c478bd9Sstevel@tonic-gate if (ret == 0) { 13717c478bd9Sstevel@tonic-gate len = strlen(buf); 13727c478bd9Sstevel@tonic-gate if (len + strlen(path) + 1 >= buflen) { 13737c478bd9Sstevel@tonic-gate ret = ENAMETOOLONG; 13747c478bd9Sstevel@tonic-gate } else { 13757c478bd9Sstevel@tonic-gate if (buf[len - 1] != '/') 13767c478bd9Sstevel@tonic-gate buf[len++] = '/'; 13777c478bd9Sstevel@tonic-gate bcopy(path, buf + len, 13787c478bd9Sstevel@tonic-gate strlen(path) + 1); 13797c478bd9Sstevel@tonic-gate } 13807c478bd9Sstevel@tonic-gate } 13817c478bd9Sstevel@tonic-gate 13827c478bd9Sstevel@tonic-gate VN_RELE(pvp); 13837c478bd9Sstevel@tonic-gate } else 13847c478bd9Sstevel@tonic-gate ret = ENOENT; 13857c478bd9Sstevel@tonic-gate } else 13867c478bd9Sstevel@tonic-gate ret = dirtopath(vrootp, vp, buf, buflen, cr); 13877c478bd9Sstevel@tonic-gate 13887c478bd9Sstevel@tonic-gate VN_RELE(vrootp); 13897c478bd9Sstevel@tonic-gate if (doclose) { 1390*da6c28aaSamw (void) VOP_CLOSE(vp, FREAD, 1, 0, cr, NULL); 13917c478bd9Sstevel@tonic-gate VN_RELE(vp); 13927c478bd9Sstevel@tonic-gate } 13937c478bd9Sstevel@tonic-gate 13947c478bd9Sstevel@tonic-gate return (ret); 13957c478bd9Sstevel@tonic-gate } 13967c478bd9Sstevel@tonic-gate 13977c478bd9Sstevel@tonic-gate int 13987c478bd9Sstevel@tonic-gate vnodetopath(vnode_t *vrootp, vnode_t *vp, char *buf, size_t buflen, cred_t *cr) 13997c478bd9Sstevel@tonic-gate { 14007c478bd9Sstevel@tonic-gate return (vnodetopath_common(vrootp, vp, buf, buflen, cr, 0)); 14017c478bd9Sstevel@tonic-gate } 14027c478bd9Sstevel@tonic-gate 14037c478bd9Sstevel@tonic-gate int 14047c478bd9Sstevel@tonic-gate dogetcwd(char *buf, size_t buflen) 14057c478bd9Sstevel@tonic-gate { 14067c478bd9Sstevel@tonic-gate int ret; 14077c478bd9Sstevel@tonic-gate vnode_t *vp; 14087c478bd9Sstevel@tonic-gate vnode_t *compvp; 14097c478bd9Sstevel@tonic-gate refstr_t *cwd, *oldcwd; 14107c478bd9Sstevel@tonic-gate const char *value; 14117c478bd9Sstevel@tonic-gate pathname_t rpnp, pnp; 14127c478bd9Sstevel@tonic-gate proc_t *p = curproc; 14137c478bd9Sstevel@tonic-gate 14147c478bd9Sstevel@tonic-gate /* 14157c478bd9Sstevel@tonic-gate * Check to see if there is a cached version of the cwd. If so, lookup 14167c478bd9Sstevel@tonic-gate * the cached value and make sure it is the same vnode. 14177c478bd9Sstevel@tonic-gate */ 14187c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 14197c478bd9Sstevel@tonic-gate if ((cwd = PTOU(p)->u_cwd) != NULL) 14207c478bd9Sstevel@tonic-gate refstr_hold(cwd); 14217c478bd9Sstevel@tonic-gate vp = PTOU(p)->u_cdir; 14227c478bd9Sstevel@tonic-gate VN_HOLD(vp); 14237c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 14247c478bd9Sstevel@tonic-gate 14257c478bd9Sstevel@tonic-gate /* 14267c478bd9Sstevel@tonic-gate * Make sure we have permission to access the current directory. 14277c478bd9Sstevel@tonic-gate */ 1428*da6c28aaSamw if ((ret = VOP_ACCESS(vp, VEXEC, 0, CRED(), NULL)) != 0) { 14297c478bd9Sstevel@tonic-gate if (cwd != NULL) 14307c478bd9Sstevel@tonic-gate refstr_rele(cwd); 14317c478bd9Sstevel@tonic-gate VN_RELE(vp); 14327c478bd9Sstevel@tonic-gate return (ret); 14337c478bd9Sstevel@tonic-gate } 14347c478bd9Sstevel@tonic-gate 14357c478bd9Sstevel@tonic-gate if (cwd) { 14367c478bd9Sstevel@tonic-gate value = refstr_value(cwd); 14377c478bd9Sstevel@tonic-gate if ((ret = pn_get((char *)value, UIO_SYSSPACE, &pnp)) != 0) { 14387c478bd9Sstevel@tonic-gate refstr_rele(cwd); 14397c478bd9Sstevel@tonic-gate VN_RELE(vp); 14407c478bd9Sstevel@tonic-gate return (ret); 14417c478bd9Sstevel@tonic-gate } 14427c478bd9Sstevel@tonic-gate 14437c478bd9Sstevel@tonic-gate pn_alloc(&rpnp); 14447c478bd9Sstevel@tonic-gate 14457c478bd9Sstevel@tonic-gate if (lookuppn(&pnp, &rpnp, NO_FOLLOW, NULL, &compvp) == 0) { 14467c478bd9Sstevel@tonic-gate 14477c478bd9Sstevel@tonic-gate if (VN_CMP(vp, compvp) && 14487c478bd9Sstevel@tonic-gate strcmp(value, rpnp.pn_path) == 0) { 14497c478bd9Sstevel@tonic-gate VN_RELE(compvp); 14507c478bd9Sstevel@tonic-gate VN_RELE(vp); 14517c478bd9Sstevel@tonic-gate pn_free(&pnp); 14527c478bd9Sstevel@tonic-gate pn_free(&rpnp); 14537c478bd9Sstevel@tonic-gate if (strlen(value) + 1 > buflen) { 14547c478bd9Sstevel@tonic-gate refstr_rele(cwd); 14557c478bd9Sstevel@tonic-gate return (ENAMETOOLONG); 14567c478bd9Sstevel@tonic-gate } 14577c478bd9Sstevel@tonic-gate bcopy(value, buf, strlen(value) + 1); 14587c478bd9Sstevel@tonic-gate refstr_rele(cwd); 14597c478bd9Sstevel@tonic-gate return (0); 14607c478bd9Sstevel@tonic-gate } 14617c478bd9Sstevel@tonic-gate 14627c478bd9Sstevel@tonic-gate VN_RELE(compvp); 14637c478bd9Sstevel@tonic-gate } 14647c478bd9Sstevel@tonic-gate 14657c478bd9Sstevel@tonic-gate pn_free(&rpnp); 14667c478bd9Sstevel@tonic-gate pn_free(&pnp); 14677c478bd9Sstevel@tonic-gate 14687c478bd9Sstevel@tonic-gate refstr_rele(cwd); 14697c478bd9Sstevel@tonic-gate } 14707c478bd9Sstevel@tonic-gate 14717c478bd9Sstevel@tonic-gate ret = vnodetopath_common(NULL, vp, buf, buflen, CRED(), 14727c478bd9Sstevel@tonic-gate LOOKUP_CHECKREAD); 14737c478bd9Sstevel@tonic-gate 14747c478bd9Sstevel@tonic-gate VN_RELE(vp); 14757c478bd9Sstevel@tonic-gate 14767c478bd9Sstevel@tonic-gate /* 14777c478bd9Sstevel@tonic-gate * Store the new cwd and replace the existing cached copy. 14787c478bd9Sstevel@tonic-gate */ 14797c478bd9Sstevel@tonic-gate if (ret == 0) 14807c478bd9Sstevel@tonic-gate cwd = refstr_alloc(buf); 14817c478bd9Sstevel@tonic-gate else 14827c478bd9Sstevel@tonic-gate cwd = NULL; 14837c478bd9Sstevel@tonic-gate 14847c478bd9Sstevel@tonic-gate mutex_enter(&p->p_lock); 14857c478bd9Sstevel@tonic-gate oldcwd = PTOU(p)->u_cwd; 14867c478bd9Sstevel@tonic-gate PTOU(p)->u_cwd = cwd; 14877c478bd9Sstevel@tonic-gate mutex_exit(&p->p_lock); 14887c478bd9Sstevel@tonic-gate 14897c478bd9Sstevel@tonic-gate if (oldcwd) 14907c478bd9Sstevel@tonic-gate refstr_rele(oldcwd); 14917c478bd9Sstevel@tonic-gate 14927c478bd9Sstevel@tonic-gate return (ret); 14937c478bd9Sstevel@tonic-gate } 1494