219 lines
5.4 KiB
C
219 lines
5.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2014 The FreeBSD Foundation
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*
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* This software was developed by Edward Tomasz Napierala under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/condvar.h>
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#include <sys/ioccom.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/sx.h>
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#include <sys/taskqueue.h>
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#include <sys/tree.h>
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#include <sys/vnode.h>
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#include <fs/autofs/autofs.h>
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static const char *autofs_opts[] = {
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"from", "master_options", "master_prefix", NULL
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};
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extern struct autofs_softc *autofs_softc;
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static int
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autofs_mount(struct mount *mp)
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{
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struct autofs_mount *amp;
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char *from, *fspath, *options, *prefix;
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int error;
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if (vfs_filteropt(mp->mnt_optnew, autofs_opts))
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return (EINVAL);
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if (mp->mnt_flag & MNT_UPDATE) {
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autofs_flush(VFSTOAUTOFS(mp));
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return (0);
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}
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if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL))
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return (EINVAL);
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if (vfs_getopt(mp->mnt_optnew, "fspath", (void **)&fspath, NULL))
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return (EINVAL);
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if (vfs_getopt(mp->mnt_optnew, "master_options", (void **)&options, NULL))
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return (EINVAL);
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if (vfs_getopt(mp->mnt_optnew, "master_prefix", (void **)&prefix, NULL))
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return (EINVAL);
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amp = malloc(sizeof(*amp), M_AUTOFS, M_WAITOK | M_ZERO);
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mp->mnt_data = amp;
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amp->am_mp = mp;
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strlcpy(amp->am_from, from, sizeof(amp->am_from));
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strlcpy(amp->am_mountpoint, fspath, sizeof(amp->am_mountpoint));
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strlcpy(amp->am_options, options, sizeof(amp->am_options));
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strlcpy(amp->am_prefix, prefix, sizeof(amp->am_prefix));
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sx_init(&->am_lock, "autofslk");
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amp->am_last_fileno = 1;
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vfs_getnewfsid(mp);
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MNT_ILOCK(mp);
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mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED;
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MNT_IUNLOCK(mp);
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AUTOFS_XLOCK(amp);
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error = autofs_node_new(NULL, amp, ".", -1, &->am_root);
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if (error != 0) {
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AUTOFS_XUNLOCK(amp);
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free(amp, M_AUTOFS);
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return (error);
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}
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AUTOFS_XUNLOCK(amp);
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vfs_mountedfrom(mp, from);
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return (0);
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}
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static int
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autofs_unmount(struct mount *mp, int mntflags)
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{
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struct autofs_mount *amp;
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struct autofs_node *anp;
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struct autofs_request *ar;
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int error, flags;
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bool found;
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amp = VFSTOAUTOFS(mp);
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flags = 0;
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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error = vflush(mp, 0, flags, curthread);
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if (error != 0) {
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AUTOFS_DEBUG("vflush failed with error %d", error);
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return (error);
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}
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/*
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* All vnodes are gone, and new one will not appear - so,
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* no new triggerings. We can iterate over outstanding
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* autofs_requests and terminate them.
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*/
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for (;;) {
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found = false;
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sx_xlock(&autofs_softc->sc_lock);
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TAILQ_FOREACH(ar, &autofs_softc->sc_requests, ar_next) {
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if (ar->ar_mount != amp)
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continue;
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ar->ar_error = ENXIO;
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ar->ar_done = true;
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ar->ar_in_progress = false;
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found = true;
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}
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sx_xunlock(&autofs_softc->sc_lock);
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if (found == false)
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break;
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cv_broadcast(&autofs_softc->sc_cv);
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pause("autofs_umount", 1);
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}
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AUTOFS_XLOCK(amp);
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/*
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* Not terribly efficient, but at least not recursive.
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*/
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while (!RB_EMPTY(&->am_root->an_children)) {
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anp = RB_MIN(autofs_node_tree, &->am_root->an_children);
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while (!RB_EMPTY(&anp->an_children))
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anp = RB_MIN(autofs_node_tree, &anp->an_children);
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autofs_node_delete(anp);
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}
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autofs_node_delete(amp->am_root);
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mp->mnt_data = NULL;
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AUTOFS_XUNLOCK(amp);
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sx_destroy(&->am_lock);
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free(amp, M_AUTOFS);
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return (0);
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}
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static int
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autofs_root(struct mount *mp, int flags, struct vnode **vpp)
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{
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struct autofs_mount *amp;
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int error;
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amp = VFSTOAUTOFS(mp);
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error = autofs_node_vn(amp->am_root, mp, flags, vpp);
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return (error);
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}
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static int
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autofs_statfs(struct mount *mp, struct statfs *sbp)
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{
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sbp->f_bsize = S_BLKSIZE;
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sbp->f_iosize = 0;
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sbp->f_blocks = 0;
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sbp->f_bfree = 0;
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sbp->f_bavail = 0;
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sbp->f_files = 0;
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sbp->f_ffree = 0;
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return (0);
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}
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static struct vfsops autofs_vfsops = {
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.vfs_fhtovp = NULL, /* XXX */
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.vfs_mount = autofs_mount,
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.vfs_unmount = autofs_unmount,
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.vfs_root = autofs_root,
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.vfs_statfs = autofs_statfs,
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.vfs_init = autofs_init,
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.vfs_uninit = autofs_uninit,
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};
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VFS_SET(autofs_vfsops, autofs, VFCF_SYNTHETIC | VFCF_NETWORK);
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MODULE_VERSION(autofs, 1);
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