1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 27 /* All Rights Reserved */ 28 29 /* 30 * Portions of this source code were derived from Berkeley 4.3 BSD 31 * under license from the Regents of the University of California. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/isa_defs.h> 36 #include <sys/types.h> 37 #include <sys/sysmacros.h> 38 #include <sys/systm.h> 39 #include <sys/errno.h> 40 #include <sys/pathname.h> 41 #include <sys/vfs.h> 42 #include <sys/vnode.h> 43 #include <sys/proc.h> 44 #include <sys/uio.h> 45 #include <sys/debug.h> 46 #include <c2/audit.h> 47 #include <fs/fs_subr.h> 48 49 /* 50 * Create a symbolic link. Similar to link or rename except target 51 * name is passed as string argument, not converted to vnode reference. 52 */ 53 int 54 symlink(char *target, char *linkname) 55 { 56 vnode_t *dvp; 57 struct vattr vattr; 58 struct pathname lpn; 59 char *tbuf; 60 size_t tlen; 61 int error; 62 int estale_retry = 0; 63 64 top: 65 if (error = pn_get(linkname, UIO_USERSPACE, &lpn)) 66 return (set_errno(error)); 67 if (error = lookuppn(&lpn, NULL, NO_FOLLOW, &dvp, NULLVPP)) { 68 pn_free(&lpn); 69 if ((error == ESTALE) && fs_need_estale_retry(estale_retry++)) 70 goto top; 71 return (set_errno(error)); 72 } 73 if (vn_is_readonly(dvp)) 74 error = EROFS; 75 else if (pn_fixslash(&lpn)) 76 error = ENOTDIR; 77 else { 78 tbuf = kmem_alloc(MAXPATHLEN, KM_SLEEP); 79 if ((error = copyinstr(target, tbuf, MAXPATHLEN, &tlen)) == 0) { 80 vattr.va_type = VLNK; 81 vattr.va_mode = 0777; 82 vattr.va_mask = AT_TYPE|AT_MODE; 83 error = VOP_SYMLINK(dvp, lpn.pn_path, &vattr, 84 tbuf, CRED(), NULL, 0); 85 if (AU_AUDITING()) 86 audit_symlink_create(dvp, lpn.pn_path, 87 tbuf, error); 88 } 89 kmem_free(tbuf, MAXPATHLEN); 90 } 91 pn_free(&lpn); 92 VN_RELE(dvp); 93 if (error) { 94 if ((error == ESTALE) && fs_need_estale_retry(estale_retry++)) 95 goto top; 96 return (set_errno(error)); 97 } 98 return (0); 99 } 100