autofs_vfsops.c

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    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: releng/10.4/sys/fs/autofs/autofs_vfsops.c 279742 2015-03-07 19:36:06Z trasz $");
   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/sx.h>
   43 #include <sys/taskqueue.h>
   44 #include <sys/vnode.h>
   45 
   46 #include <fs/autofs/autofs.h>
   47 
   48 static const char *autofs_opts[] = {
   49         "from", "master_options", "master_prefix", NULL
   50 };
   51 
   52 extern struct autofs_softc      *autofs_softc;
   53 
   54 static int
   55 autofs_mount(struct mount *mp)
   56 {
   57         struct autofs_mount *amp;
   58         char *from, *fspath, *options, *prefix;
   59         int error;
   60 
   61         if (vfs_filteropt(mp->mnt_optnew, autofs_opts))
   62                 return (EINVAL);
   63 
   64         if (mp->mnt_flag & MNT_UPDATE) {
   65                 autofs_flush(VFSTOAUTOFS(mp));
   66                 return (0);
   67         }
   68 
   69         if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL))
   70                 return (EINVAL);
   71 
   72         if (vfs_getopt(mp->mnt_optnew, "fspath", (void **)&fspath, NULL))
   73                 return (EINVAL);
   74 
   75         if (vfs_getopt(mp->mnt_optnew, "master_options", (void **)&options, NULL))
   76                 return (EINVAL);
   77 
   78         if (vfs_getopt(mp->mnt_optnew, "master_prefix", (void **)&prefix, NULL))
   79                 return (EINVAL);
   80 
   81         amp = malloc(sizeof(*amp), M_AUTOFS, M_WAITOK | M_ZERO);
   82         mp->mnt_data = amp;
   83         amp->am_mp = mp;
   84         strlcpy(amp->am_from, from, sizeof(amp->am_from));
   85         strlcpy(amp->am_mountpoint, fspath, sizeof(amp->am_mountpoint));
   86         strlcpy(amp->am_options, options, sizeof(amp->am_options));
   87         strlcpy(amp->am_prefix, prefix, sizeof(amp->am_prefix));
   88         sx_init(&amp->am_lock, "autofslk");
   89         amp->am_last_fileno = 1;
   90 
   91         vfs_getnewfsid(mp);
   92 
   93         MNT_ILOCK(mp);
   94         mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED;
   95         MNT_IUNLOCK(mp);
   96 
   97         AUTOFS_XLOCK(amp);
   98         error = autofs_node_new(NULL, amp, ".", -1, &amp->am_root);
   99         if (error != 0) {
  100                 AUTOFS_XUNLOCK(amp);
  101                 free(amp, M_AUTOFS);
  102                 return (error);
  103         }
  104         AUTOFS_XUNLOCK(amp);
  105 
  106         vfs_mountedfrom(mp, from);
  107 
  108         return (0);
  109 }
  110 
  111 static int
  112 autofs_unmount(struct mount *mp, int mntflags)
  113 {
  114         struct autofs_mount *amp;
  115         struct autofs_node *anp;
  116         struct autofs_request *ar;
  117         int error, flags;
  118         bool found;
  119 
  120         amp = VFSTOAUTOFS(mp);
  121 
  122         flags = 0;
  123         if (mntflags & MNT_FORCE)
  124                 flags |= FORCECLOSE;
  125         error = vflush(mp, 0, flags, curthread);
  126         if (error != 0) {
  127                 AUTOFS_WARN("vflush failed with error %d", error);
  128                 return (error);
  129         }
  130 
  131         /*
  132          * All vnodes are gone, and new one will not appear - so,
  133          * no new triggerings.  We can iterate over outstanding
  134          * autofs_requests and terminate them.
  135          */
  136         for (;;) {
  137                 found = false;
  138                 sx_xlock(&autofs_softc->sc_lock);
  139                 TAILQ_FOREACH(ar, &autofs_softc->sc_requests, ar_next) {
  140                         if (ar->ar_mount != amp)
  141                                 continue;
  142                         ar->ar_error = ENXIO;
  143                         ar->ar_done = true;
  144                         ar->ar_in_progress = false;
  145                         found = true;
  146                 }
  147                 sx_xunlock(&autofs_softc->sc_lock);
  148                 if (found == false)
  149                         break;
  150 
  151                 cv_broadcast(&autofs_softc->sc_cv);
  152                 pause("autofs_umount", 1);
  153         }
  154 
  155         AUTOFS_XLOCK(amp);
  156 
  157         /*
  158          * Not terribly efficient, but at least not recursive.
  159          */
  160         while (!TAILQ_EMPTY(&amp->am_root->an_children)) {
  161                 anp = TAILQ_FIRST(&amp->am_root->an_children);
  162                 while (!TAILQ_EMPTY(&anp->an_children))
  163                         anp = TAILQ_FIRST(&anp->an_children);
  164                 autofs_node_delete(anp);
  165         }
  166         autofs_node_delete(amp->am_root);
  167 
  168         mp->mnt_data = NULL;
  169         AUTOFS_XUNLOCK(amp);
  170 
  171         sx_destroy(&amp->am_lock);
  172 
  173         free(amp, M_AUTOFS);
  174 
  175         return (0);
  176 }
  177 
  178 static int
  179 autofs_root(struct mount *mp, int flags, struct vnode **vpp)
  180 {
  181         struct autofs_mount *amp;
  182         int error;
  183 
  184         amp = VFSTOAUTOFS(mp);
  185 
  186         error = autofs_node_vn(amp->am_root, mp, flags, vpp);
  187 
  188         return (error);
  189 }
  190 
  191 static int
  192 autofs_statfs(struct mount *mp, struct statfs *sbp)
  193 {
  194 
  195         sbp->f_bsize = 512;
  196         sbp->f_iosize = 0;
  197         sbp->f_blocks = 0;
  198         sbp->f_bfree = 0;
  199         sbp->f_bavail = 0;
  200         sbp->f_files = 0;
  201         sbp->f_ffree = 0;
  202 
  203         return (0);
  204 }
  205 
  206 static struct vfsops autofs_vfsops = {
  207         .vfs_fhtovp =           NULL, /* XXX */
  208         .vfs_mount =            autofs_mount,
  209         .vfs_unmount =          autofs_unmount,
  210         .vfs_root =             autofs_root,
  211         .vfs_statfs =           autofs_statfs,
  212         .vfs_init =             autofs_init,
  213         .vfs_uninit =           autofs_uninit,
  214 };
  215 
  216 VFS_SET(autofs_vfsops, autofs, VFCF_SYNTHETIC | VFCF_NETWORK);
  217 MODULE_VERSION(autofs, 1);

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

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sys/fs/autofs/autofs_vfsops.c