autofs_vfsops.c

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

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FreeBSD/Linux Kernel Cross Reference sys/fs/autofs/autofs_vfsops.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/autofs/autofs_vfsops.c