6966ac055c
I sent out an e-mail on 2020/01/21 with a plan to do this to Kyle, Rob, and Wes; all parties have responded in the affirmative that it's OK to drop it from these files.
340 lines
8.3 KiB
C
340 lines
8.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2017 Kyle J. Kneitinger <kyle@kneit.in>
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* Copyright (c) 2018 Kyle Evans <kevans@FreeBSD.org>
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* Copyright (c) 2019 Wes Maag <wes@jwmaag.org>
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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 REGENTS 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 REGENTS 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/mntent.h>
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#include "be.h"
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#include "be_impl.h"
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struct be_mountcheck_info {
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const char *path;
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char *name;
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};
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struct be_mount_info {
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libbe_handle_t *lbh;
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const char *be;
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const char *mountpoint;
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int mntflags;
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int deepmount;
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int depth;
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};
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static int
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be_mountcheck_cb(zfs_handle_t *zfs_hdl, void *data)
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{
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struct be_mountcheck_info *info;
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char *mountpoint;
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if (data == NULL)
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return (1);
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info = (struct be_mountcheck_info *)data;
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if (!zfs_is_mounted(zfs_hdl, &mountpoint))
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return (0);
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if (strcmp(mountpoint, info->path) == 0) {
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info->name = strdup(zfs_get_name(zfs_hdl));
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free(mountpoint);
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return (1);
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}
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free(mountpoint);
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return (0);
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}
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/*
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* Called from be_mount, uses the given zfs_handle and attempts to
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* mount it at the passed mountpoint. If the deepmount flag is set, continue
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* calling the function for each child dataset.
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*/
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static int
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be_mount_iter(zfs_handle_t *zfs_hdl, void *data)
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{
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int err;
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char *mountpoint;
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char tmp[BE_MAXPATHLEN], zfs_mnt[BE_MAXPATHLEN];
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struct be_mount_info *info;
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info = (struct be_mount_info *)data;
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if (zfs_is_mounted(zfs_hdl, &mountpoint)) {
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free(mountpoint);
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return (0);
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}
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/*
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* canmount and mountpoint are both ignored for the BE dataset, because
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* the rest of the system (kernel and loader) will effectively do the
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* same.
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*/
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if (info->depth == 0) {
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snprintf(tmp, BE_MAXPATHLEN, "%s", info->mountpoint);
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} else {
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if (zfs_prop_get_int(zfs_hdl, ZFS_PROP_CANMOUNT) ==
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ZFS_CANMOUNT_OFF)
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return (0);
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if (zfs_prop_get(zfs_hdl, ZFS_PROP_MOUNTPOINT, zfs_mnt,
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BE_MAXPATHLEN, NULL, NULL, 0, 1))
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return (1);
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/*
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* We've encountered mountpoint=none at some intermediate
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* dataset (e.g. zroot/var) that will have children that may
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* need to be mounted. Skip mounting it, but iterate through
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* the children.
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*/
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if (strcmp("none", zfs_mnt) == 0)
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goto skipmount;
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mountpoint = be_mountpoint_augmented(info->lbh, zfs_mnt);
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snprintf(tmp, BE_MAXPATHLEN, "%s%s", info->mountpoint,
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mountpoint);
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}
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if ((err = zfs_mount_at(zfs_hdl, NULL, info->mntflags, tmp)) != 0) {
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switch (errno) {
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case ENAMETOOLONG:
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return (set_error(info->lbh, BE_ERR_PATHLEN));
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case ELOOP:
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case ENOENT:
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case ENOTDIR:
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return (set_error(info->lbh, BE_ERR_BADPATH));
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case EPERM:
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return (set_error(info->lbh, BE_ERR_PERMS));
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case EBUSY:
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return (set_error(info->lbh, BE_ERR_PATHBUSY));
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default:
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return (set_error(info->lbh, BE_ERR_UNKNOWN));
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}
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}
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if (!info->deepmount)
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return (0);
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skipmount:
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++info->depth;
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err = zfs_iter_filesystems(zfs_hdl, be_mount_iter, info);
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--info->depth;
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return (err);
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}
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static int
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be_umount_iter(zfs_handle_t *zfs_hdl, void *data)
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{
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int err;
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char *mountpoint;
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struct be_mount_info *info;
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info = (struct be_mount_info *)data;
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++info->depth;
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if((err = zfs_iter_filesystems(zfs_hdl, be_umount_iter, info)) != 0) {
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return (err);
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}
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--info->depth;
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if (!zfs_is_mounted(zfs_hdl, &mountpoint)) {
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return (0);
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}
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free(mountpoint);
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if (zfs_unmount(zfs_hdl, NULL, info->mntflags) != 0) {
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switch (errno) {
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case ENAMETOOLONG:
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return (set_error(info->lbh, BE_ERR_PATHLEN));
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case ELOOP:
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case ENOENT:
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case ENOTDIR:
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return (set_error(info->lbh, BE_ERR_BADPATH));
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case EPERM:
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return (set_error(info->lbh, BE_ERR_PERMS));
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case EBUSY:
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return (set_error(info->lbh, BE_ERR_PATHBUSY));
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default:
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return (set_error(info->lbh, BE_ERR_UNKNOWN));
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}
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}
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return (0);
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}
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/*
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* usage
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*/
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int
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be_mounted_at(libbe_handle_t *lbh, const char *path, nvlist_t *details)
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{
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char be[BE_MAXPATHLEN];
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zfs_handle_t *root_hdl;
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struct be_mountcheck_info info;
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prop_data_t propinfo;
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bzero(&be, BE_MAXPATHLEN);
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if ((root_hdl = zfs_open(lbh->lzh, lbh->root,
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ZFS_TYPE_FILESYSTEM)) == NULL)
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return (BE_ERR_ZFSOPEN);
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info.path = path;
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info.name = NULL;
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zfs_iter_filesystems(root_hdl, be_mountcheck_cb, &info);
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zfs_close(root_hdl);
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if (info.name != NULL) {
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if (details != NULL) {
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if ((root_hdl = zfs_open(lbh->lzh, lbh->root,
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ZFS_TYPE_FILESYSTEM)) == NULL) {
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free(info.name);
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return (BE_ERR_ZFSOPEN);
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}
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propinfo.lbh = lbh;
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propinfo.list = details;
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propinfo.single_object = false;
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prop_list_builder_cb(root_hdl, &propinfo);
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zfs_close(root_hdl);
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}
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free(info.name);
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return (0);
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}
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return (1);
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}
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/*
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* usage
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*/
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int
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be_mount(libbe_handle_t *lbh, char *bootenv, char *mountpoint, int flags,
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char *result_loc)
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{
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char be[BE_MAXPATHLEN];
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char mnt_temp[BE_MAXPATHLEN];
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int mntflags, mntdeep;
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int err;
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struct be_mount_info info;
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zfs_handle_t *zhdl;
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if ((err = be_root_concat(lbh, bootenv, be)) != 0)
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return (set_error(lbh, err));
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if ((err = be_exists(lbh, bootenv)) != 0)
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return (set_error(lbh, err));
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if (is_mounted(lbh->lzh, be, NULL))
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return (set_error(lbh, BE_ERR_MOUNTED));
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mntdeep = (flags & BE_MNT_DEEP) ? 1 : 0;
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mntflags = (flags & BE_MNT_FORCE) ? MNT_FORCE : 0;
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/* Create mountpoint if it is not specified */
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if (mountpoint == NULL) {
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strlcpy(mnt_temp, "/tmp/be_mount.XXXX", sizeof(mnt_temp));
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if (mkdtemp(mnt_temp) == NULL)
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return (set_error(lbh, BE_ERR_IO));
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}
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if ((zhdl = zfs_open(lbh->lzh, be, ZFS_TYPE_FILESYSTEM)) == NULL)
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return (set_error(lbh, BE_ERR_ZFSOPEN));
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info.lbh = lbh;
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info.be = be;
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info.mountpoint = (mountpoint == NULL) ? mnt_temp : mountpoint;
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info.mntflags = mntflags;
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info.deepmount = mntdeep;
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info.depth = 0;
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if((err = be_mount_iter(zhdl, &info) != 0)) {
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zfs_close(zhdl);
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return (err);
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}
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zfs_close(zhdl);
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if (result_loc != NULL)
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strlcpy(result_loc, mountpoint == NULL ? mnt_temp : mountpoint,
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BE_MAXPATHLEN);
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return (BE_ERR_SUCCESS);
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}
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/*
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* usage
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*/
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int
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be_unmount(libbe_handle_t *lbh, char *bootenv, int flags)
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{
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int err;
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char be[BE_MAXPATHLEN];
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zfs_handle_t *root_hdl;
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struct be_mount_info info;
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if ((err = be_root_concat(lbh, bootenv, be)) != 0)
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return (set_error(lbh, err));
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if ((root_hdl = zfs_open(lbh->lzh, be, ZFS_TYPE_FILESYSTEM)) == NULL)
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return (set_error(lbh, BE_ERR_ZFSOPEN));
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info.lbh = lbh;
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info.be = be;
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info.mountpoint = NULL;
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info.mntflags = (flags & BE_MNT_FORCE) ? MS_FORCE : 0;
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info.depth = 0;
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if ((err = be_umount_iter(root_hdl, &info)) != 0) {
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zfs_close(root_hdl);
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return (err);
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}
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zfs_close(root_hdl);
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return (BE_ERR_SUCCESS);
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}
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/*
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* This function will blow away the input buffer as needed if we're discovered
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* to be looking at a root-mount. If the mountpoint is naturally beyond the
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* root, however, the buffer may be left intact and a pointer to the section
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* past altroot will be returned instead for the caller's perusal.
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*/
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char *
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be_mountpoint_augmented(libbe_handle_t *lbh, char *mountpoint)
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{
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if (lbh->altroot_len == 0)
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return (mountpoint);
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if (mountpoint == NULL || *mountpoint == '\0')
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return (mountpoint);
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if (mountpoint[lbh->altroot_len] == '\0') {
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*(mountpoint + 1) = '\0';
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return (mountpoint);
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} else
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return (mountpoint + lbh->altroot_len);
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}
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