/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2017 Kyle J. Kneitinger <kyle@kneit.in>
* Copyright (c) 2018 Kyle Evans <kevans@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "be.h"
#include "be_impl.h"
struct be_mountcheck_info {
const char *path;
char *name;
};
static int
be_mountcheck_cb(zfs_handle_t *zfs_hdl, void *data)
{
struct be_mountcheck_info *info;
char *mountpoint;
if (data == NULL)
return (1);
info = (struct be_mountcheck_info *)data;
if (!zfs_is_mounted(zfs_hdl, &mountpoint))
return (0);
if (strcmp(mountpoint, info->path) == 0) {
info->name = strdup(zfs_get_name(zfs_hdl));
free(mountpoint);
return (1);
}
free(mountpoint);
return (0);
}
/*
* usage
*/
int
be_mounted_at(libbe_handle_t *lbh, const char *path, nvlist_t *details)
{
char be[BE_MAXPATHLEN];
zfs_handle_t *root_hdl;
struct be_mountcheck_info info;
prop_data_t propinfo;
bzero(&be, BE_MAXPATHLEN);
if ((root_hdl = zfs_open(lbh->lzh, lbh->root,
ZFS_TYPE_FILESYSTEM)) == NULL)
return (BE_ERR_ZFSOPEN);
info.path = path;
info.name = NULL;
zfs_iter_filesystems(root_hdl, be_mountcheck_cb, &info);
zfs_close(root_hdl);
if (info.name != NULL) {
if (details != NULL) {
if ((root_hdl = zfs_open(lbh->lzh, lbh->root,
ZFS_TYPE_FILESYSTEM)) == NULL) {
free(info.name);
return (BE_ERR_ZFSOPEN);
}
propinfo.lbh = lbh;
propinfo.list = details;
propinfo.single_object = false;
prop_list_builder_cb(root_hdl, &propinfo);
zfs_close(root_hdl);
}
free(info.name);
return (0);
}
return (1);
}
/*
* usage
*/
int
be_mount(libbe_handle_t *lbh, char *bootenv, char *mountpoint, int flags,
char *result_loc)
{
char be[BE_MAXPATHLEN];
char mnt_temp[BE_MAXPATHLEN];
int mntflags;
int err;
if ((err = be_root_concat(lbh, bootenv, be)) != 0)
return (set_error(lbh, err));
if ((err = be_exists(lbh, bootenv)) != 0)
return (set_error(lbh, err));
if (is_mounted(lbh->lzh, be, NULL))
return (set_error(lbh, BE_ERR_MOUNTED));
mntflags = (flags & BE_MNT_FORCE) ? MNT_FORCE : 0;
/* Create mountpoint if it is not specified */
if (mountpoint == NULL) {
strlcpy(mnt_temp, "/tmp/be_mount.XXXX", sizeof(mnt_temp));
if (mkdtemp(mnt_temp) == NULL)
return (set_error(lbh, BE_ERR_IO));
}
char opt = '\0';
if ((err = zmount(be, (mountpoint == NULL) ? mnt_temp : mountpoint,
mntflags, __DECONST(char *, MNTTYPE_ZFS), NULL, 0, &opt, 1)) != 0) {
switch (errno) {
case ENAMETOOLONG:
return (set_error(lbh, BE_ERR_PATHLEN));
case ELOOP:
case ENOENT:
case ENOTDIR:
return (set_error(lbh, BE_ERR_BADPATH));
case EPERM:
return (set_error(lbh, BE_ERR_PERMS));
case EBUSY:
return (set_error(lbh, BE_ERR_PATHBUSY));
default:
return (set_error(lbh, BE_ERR_UNKNOWN));
}
}
if (result_loc != NULL)
strlcpy(result_loc, mountpoint == NULL ? mnt_temp : mountpoint,
BE_MAXPATHLEN);
return (BE_ERR_SUCCESS);
}
/*
* usage
*/
int
be_unmount(libbe_handle_t *lbh, char *bootenv, int flags)
{
int err, mntflags;
char be[BE_MAXPATHLEN];
struct statfs *mntbuf;
int mntsize;
char *mntpath;
if ((err = be_root_concat(lbh, bootenv, be)) != 0)
return (set_error(lbh, err));
if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) {
if (errno == EIO)
return (set_error(lbh, BE_ERR_IO));
return (set_error(lbh, BE_ERR_NOMOUNT));
}
mntpath = NULL;
for (int i = 0; i < mntsize; ++i) {
/* 0x000000de is the type number of zfs */
if (mntbuf[i].f_type != 0x000000de)
continue;
if (strcmp(mntbuf[i].f_mntfromname, be) == 0) {
mntpath = mntbuf[i].f_mntonname;
break;
}
}
if (mntpath == NULL)
return (set_error(lbh, BE_ERR_NOMOUNT));
mntflags = (flags & BE_MNT_FORCE) ? MNT_FORCE : 0;
if ((err = unmount(mntpath, mntflags)) != 0) {
switch (errno) {
case ENAMETOOLONG:
return (set_error(lbh, BE_ERR_PATHLEN));
case ELOOP:
case ENOENT:
case ENOTDIR:
return (set_error(lbh, BE_ERR_BADPATH));
case EPERM:
return (set_error(lbh, BE_ERR_PERMS));
case EBUSY:
return (set_error(lbh, BE_ERR_PATHBUSY));
default:
return (set_error(lbh, BE_ERR_UNKNOWN));
}
}
return (set_error(lbh, BE_ERR_SUCCESS));
}
