1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2014 The FreeBSD Foundation 5 * 6 * This software was developed by Edward Tomasz Napierala under sponsorship 7 * from the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 */ 31 32#include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35#include <sys/param.h> 36#include <sys/systm.h> 37#include <sys/conf.h> 38#include <sys/condvar.h> 39#include <sys/ioccom.h> 40#include <sys/kernel.h> 41#include <sys/module.h> 42#include <sys/mount.h> 43#include <sys/stat.h> 44#include <sys/sx.h> 45#include <sys/taskqueue.h> 46#include <sys/tree.h> 47#include <sys/vnode.h> 48 49#include <fs/autofs/autofs.h> 50 51static const char *autofs_opts[] = { 52 "from", "master_options", "master_prefix", NULL 53}; 54 55extern struct autofs_softc *autofs_softc; 56 57static int 58autofs_mount(struct mount *mp) 59{ 60 struct autofs_mount *amp; 61 char *from, *fspath, *options, *prefix; 62 int error; 63 64 if (vfs_filteropt(mp->mnt_optnew, autofs_opts)) 65 return (EINVAL); 66 67 if (mp->mnt_flag & MNT_UPDATE) { 68 autofs_flush(VFSTOAUTOFS(mp)); 69 return (0); 70 } 71 72 if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL)) 73 return (EINVAL); 74 75 if (vfs_getopt(mp->mnt_optnew, "fspath", (void **)&fspath, NULL)) 76 return (EINVAL); 77 78 if (vfs_getopt(mp->mnt_optnew, "master_options", (void **)&options, NULL)) 79 return (EINVAL); 80 81 if (vfs_getopt(mp->mnt_optnew, "master_prefix", (void **)&prefix, NULL)) 82 return (EINVAL); 83 84 amp = malloc(sizeof(*amp), M_AUTOFS, M_WAITOK | M_ZERO); 85 mp->mnt_data = amp; 86 amp->am_mp = mp; 87 strlcpy(amp->am_from, from, sizeof(amp->am_from)); 88 strlcpy(amp->am_mountpoint, fspath, sizeof(amp->am_mountpoint)); 89 strlcpy(amp->am_options, options, sizeof(amp->am_options)); 90 strlcpy(amp->am_prefix, prefix, sizeof(amp->am_prefix)); 91 sx_init(&->am_lock, "autofslk"); 92 amp->am_last_fileno = 1; 93 94 vfs_getnewfsid(mp); 95 96 MNT_ILOCK(mp); 97 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED; 98 MNT_IUNLOCK(mp); 99 100 AUTOFS_XLOCK(amp); 101 error = autofs_node_new(NULL, amp, ".", -1, &->am_root); 102 if (error != 0) { 103 AUTOFS_XUNLOCK(amp); 104 free(amp, M_AUTOFS); 105 return (error); 106 } 107 AUTOFS_XUNLOCK(amp); 108 109 vfs_mountedfrom(mp, from); 110 111 return (0); 112} 113 114static int 115autofs_unmount(struct mount *mp, int mntflags) 116{ 117 struct autofs_mount *amp; 118 struct autofs_node *anp; 119 struct autofs_request *ar; 120 int error, flags; 121 bool found; 122 123 amp = VFSTOAUTOFS(mp); 124 125 flags = 0; 126 if (mntflags & MNT_FORCE) 127 flags |= FORCECLOSE; 128 error = vflush(mp, 0, flags, curthread); 129 if (error != 0) { 130 AUTOFS_DEBUG("vflush failed with error %d", error); 131 return (error); 132 } 133 134 /* 135 * All vnodes are gone, and new one will not appear - so, 136 * no new triggerings. We can iterate over outstanding 137 * autofs_requests and terminate them. 138 */ 139 for (;;) { 140 found = false; 141 sx_xlock(&autofs_softc->sc_lock); 142 TAILQ_FOREACH(ar, &autofs_softc->sc_requests, ar_next) { 143 if (ar->ar_mount != amp) 144 continue; 145 ar->ar_error = ENXIO; 146 ar->ar_done = true; 147 ar->ar_in_progress = false; 148 found = true; 149 } 150 sx_xunlock(&autofs_softc->sc_lock); 151 if (found == false) 152 break; 153 154 cv_broadcast(&autofs_softc->sc_cv); 155 pause("autofs_umount", 1); 156 } 157 158 AUTOFS_XLOCK(amp); 159 160 /* 161 * Not terribly efficient, but at least not recursive. 162 */ 163 while (!RB_EMPTY(&->am_root->an_children)) { 164 anp = RB_MIN(autofs_node_tree, &->am_root->an_children); 165 while (!RB_EMPTY(&anp->an_children)) 166 anp = RB_MIN(autofs_node_tree, &anp->an_children); 167 autofs_node_delete(anp); 168 } 169 autofs_node_delete(amp->am_root); 170 171 mp->mnt_data = NULL; 172 AUTOFS_XUNLOCK(amp); 173 174 sx_destroy(&->am_lock); 175 176 free(amp, M_AUTOFS); 177 178 return (0); 179} 180 181static int 182autofs_root(struct mount *mp, int flags, struct vnode **vpp) 183{ 184 struct autofs_mount *amp; 185 int error; 186 187 amp = VFSTOAUTOFS(mp); 188 189 error = autofs_node_vn(amp->am_root, mp, flags, vpp); 190 191 return (error); 192} 193 194static int 195autofs_statfs(struct mount *mp, struct statfs *sbp) 196{ 197 198 sbp->f_bsize = S_BLKSIZE; 199 sbp->f_iosize = 0; 200 sbp->f_blocks = 0; 201 sbp->f_bfree = 0; 202 sbp->f_bavail = 0; 203 sbp->f_files = 0; 204 sbp->f_ffree = 0; 205 206 return (0); 207} 208 209static struct vfsops autofs_vfsops = { 210 .vfs_fhtovp = NULL, /* XXX */ 211 .vfs_mount = autofs_mount, 212 .vfs_unmount = autofs_unmount, 213 .vfs_root = autofs_root, 214 .vfs_statfs = autofs_statfs, 215 .vfs_init = autofs_init, 216 .vfs_uninit = autofs_uninit, 217}; 218 219VFS_SET(autofs_vfsops, autofs, VFCF_SYNTHETIC | VFCF_NETWORK); 220MODULE_VERSION(autofs, 1); 221