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 2006 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 #pragma ident "%Z%%M% %I% %E% SMI" 35 36 #include <sys/param.h> 37 #include <sys/isa_defs.h> 38 #include <sys/types.h> 39 #include <sys/sysmacros.h> 40 #include <sys/cred.h> 41 #include <sys/systm.h> 42 #include <sys/errno.h> 43 #include <sys/pathname.h> 44 #include <sys/vnode.h> 45 #include <sys/vfs.h> 46 #include <sys/file.h> 47 #include <sys/uio.h> 48 #include <sys/debug.h> 49 #include <fs/fs_subr.h> 50 51 /* 52 * Common code for pathconf(), fpathconf() system calls 53 */ 54 static long 55 cpathconf(register vnode_t *vp, int cmd, struct cred *cr) 56 { 57 int error; 58 ulong_t val; 59 60 switch (cmd) { 61 case _PC_2_SYMLINKS: 62 if (error = VOP_PATHCONF(vp, _PC_SYMLINK_MAX, &val, cr)) 63 return ((long)set_errno(error)); 64 return ((long)(val > 0)); 65 66 case _PC_ALLOC_SIZE_MIN: 67 case _PC_REC_INCR_XFER_SIZE: 68 case _PC_REC_MAX_XFER_SIZE: 69 case _PC_REC_MIN_XFER_SIZE: 70 case _PC_REC_XFER_ALIGN: 71 return ((long)set_errno(EINVAL)); 72 73 case _PC_ASYNC_IO: 74 return (1l); 75 76 case _PC_PRIO_IO: 77 return ((long)set_errno(EINVAL)); 78 79 case _PC_SYNC_IO: 80 if (!(error = VOP_FSYNC(vp, FSYNC, cr))) 81 return (1l); 82 return ((long)set_errno(error)); 83 84 case _PC_XATTR_ENABLED: 85 return ((vp->v_vfsp->vfs_flag & VFS_XATTR) ? 1 : 0); 86 87 default: 88 if (error = VOP_PATHCONF(vp, cmd, &val, cr)) 89 return ((long)set_errno(error)); 90 return (val); 91 } 92 /* NOTREACHED */ 93 } 94 95 /* fpathconf/pathconf interfaces */ 96 97 long 98 fpathconf(int fdes, int name) 99 { 100 file_t *fp; 101 long retval; 102 103 if ((fp = getf(fdes)) == NULL) 104 return (set_errno(EBADF)); 105 retval = cpathconf(fp->f_vnode, name, fp->f_cred); 106 releasef(fdes); 107 return (retval); 108 } 109 110 long 111 pathconf(char *fname, int name) 112 { 113 vnode_t *vp; 114 long retval; 115 int error; 116 int estale_retry = 0; 117 118 lookup: 119 if (error = lookupname(fname, UIO_USERSPACE, FOLLOW, NULLVPP, &vp)) { 120 if ((error == ESTALE) && fs_need_estale_retry(estale_retry++)) 121 goto lookup; 122 return ((long)set_errno(error)); 123 } 124 125 retval = cpathconf(vp, name, CRED()); 126 VN_RELE(vp); 127 return (retval); 128 } 129