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  *
    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 
   51 static const char *autofs_opts[] = {
   52         "from", "master_options", "master_prefix", NULL
   53 };
   54 
   55 extern struct autofs_softc      *autofs_softc;
   56 
   57 static int
   58 autofs_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(&amp->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, &amp->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 
  114 static int
  115 autofs_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(&amp->am_root->an_children)) {
  164                 anp = RB_MIN(autofs_node_tree, &amp->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(&amp->am_lock);
  175 
  176         free(amp, M_AUTOFS);
  177 
  178         return (0);
  179 }
  180 
  181 static int
  182 autofs_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 
  194 static int
  195 autofs_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 
  209 static 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 
  219 VFS_SET(autofs_vfsops, autofs, VFCF_SYNTHETIC | VFCF_NETWORK);
  220 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