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