1 /* $NetBSD: vfs.c,v 1.10 2026/03/01 13:52:29 yamt Exp $ */ 2 3 /*- 4 * Copyright (c) 2006-2007 Pawel Jakub Dawidek <pjd (at) FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #ifdef __FreeBSD__ 31 __FBSDID("$FreeBSD: head/sys/cddl/compat/opensolaris/kern/opensolaris_lookup.c 314194 2017-02-24 07:53:56Z avg $"); 32 #endif 33 34 #include <sys/param.h> 35 #include <sys/kernel.h> 36 #include <sys/systm.h> 37 #include <sys/mount.h> 38 #include <sys/cred.h> 39 #include <sys/vfs.h> 40 #include <sys/pathname.h> 41 #include <lib/libkern/libkern.h> 42 43 int 44 lookupname(char *dirname, enum uio_seg seg, enum symfollow follow, 45 vnode_t **dirvpp, vnode_t **compvpp) 46 { 47 int error; 48 49 KASSERT(seg == UIO_SYSSPACE); 50 KASSERT(dirvpp == NULL); 51 52 *compvpp = NULL; 53 error = namei_simple_kernel(dirname, 54 follow == FOLLOW ? NSM_FOLLOW_NOEMULROOT : NSM_NOFOLLOW_NOEMULROOT, 55 compvpp); 56 57 KASSERT(error == 0 || *compvpp == NULL); 58 59 return error; 60 } 61 62 void 63 vfs_setmntopt(vfs_t *vfsp, const char *name, const char *arg, 64 int flags) 65 { 66 67 if (strcmp("ro", name) == 0) 68 vfsp->mnt_flag |= MNT_RDONLY; 69 70 if (strcmp("rw", name) == 0) 71 vfsp->mnt_flag &= ~MNT_RDONLY; 72 73 if (strcmp("nodevices", name) == 0) 74 vfsp->mnt_flag |= MNT_NODEV; 75 76 if (strcmp("noatime", name) == 0) 77 vfsp->mnt_flag |= MNT_NOATIME; 78 79 if (strcmp("atime", name) == 0) 80 vfsp->mnt_flag &= ~MNT_NOATIME; 81 82 if (strcmp("nosuid", name) == 0) 83 vfsp->mnt_flag |= MNT_NOSUID; 84 85 if (strcmp("suid", name) == 0) 86 vfsp->mnt_flag &= ~MNT_NOSUID; 87 88 if (strcmp("noexec", name) == 0) 89 vfsp->mnt_flag |= MNT_NOEXEC; 90 91 if (strcmp("exec", name) == 0) 92 vfsp->mnt_flag &= ~MNT_NOEXEC; 93 94 vfsp->mnt_flag |= MNT_LOCAL; 95 } 96 97 void 98 vfs_clearmntopt(vfs_t *vfsp, const char *name) 99 { 100 101 if (strcmp("ro", name) == 0) 102 vfsp->mnt_flag |= MNT_RDONLY; 103 104 if (strcmp("rw", name) == 0) 105 vfsp->mnt_flag &= ~MNT_RDONLY; 106 107 if (strcmp("nodevices", name) == 0) 108 vfsp->mnt_flag &= ~MNT_NODEV; 109 110 if (strcmp("noatime", name) == 0) 111 vfsp->mnt_flag &= ~MNT_NOATIME; 112 113 if (strcmp("atime", name) == 0) 114 vfsp->mnt_flag |= MNT_NOATIME; 115 116 if (strcmp("nosuid", name) == 0) 117 vfsp->mnt_flag &= ~MNT_NOSUID; 118 119 if (strcmp("suid", name) == 0) 120 vfsp->mnt_flag |= MNT_NOSUID; 121 122 if (strcmp("noexec", name) == 0) 123 vfsp->mnt_flag &= ~MNT_NOEXEC; 124 125 if (strcmp("exec", name) == 0) 126 vfsp->mnt_flag |= MNT_NOEXEC; 127 } 128 129 int 130 vfs_optionisset(const vfs_t *vfsp, const char *name, char **argp) 131 { 132 /* 133 * this api expects tri-state semantics for zfs. 134 * 135 * eg. 136 * - "ro" 137 * - "rw" 138 * - "unspecified" (ie. leave it to the corresponding zfs property) 139 * 140 * unfortunately, NetBSD system call interface (ie. MNT_xxx flags) 141 * doesn't have a way for users to leave it unspecified. 142 * (eg. as we don't have MNT_READWRITE, the lack of MNT_RDONLY 143 * automatically implies read-write.) 144 * this function treats a lack of mount option as "unspecified" to 145 * allow users to leave it to be controlled by the corresponding 146 * zfs property. 147 * unfortunately, it means that there is no way for users to override 148 * eg. "readonly" zfs property with a mount option. it's a bit shame, 149 * but better than having no way to leave it to the properties. someday 150 * we may want to introduce MNT_READWRITE... 151 */ 152 153 if (strcmp("ro", name) == 0) 154 return (vfsp->mnt_flag & MNT_RDONLY) != 0; 155 156 if (strcmp("nodevices", name) == 0) 157 return (vfsp->mnt_flag & MNT_NODEV) != 0; 158 159 if (strcmp("noatime", name) == 0) 160 return (vfsp->mnt_flag & MNT_NOATIME) != 0; 161 162 if (strcmp("nosuid", name) == 0) 163 return (vfsp->mnt_flag & MNT_NOSUID) != 0; 164 165 if (strcmp("noexec", name) == 0) 166 return (vfsp->mnt_flag & MNT_NOEXEC) != 0; 167 168 return 0; 169 } 170
Indexes created Wed Oct 07 00:25:59 UTC 2026