485172f537
This is the half of the changes required that work as-is with both in-tree ZFS and the new hotness, sysutils/openzfs. Highlights are less dependency on header pollution (from somewhere) and using 'mnttab' instead of 'extmnttab'. In the in-tree ZFS, the latter is a #define for the former, but in the port extmnttab is actually a distinct struct that's a super-set of mnttab. We really want mnttab here anyways, so just use it.
344 lines
8.4 KiB
C
344 lines
8.4 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2017 Kyle J. Kneitinger <kyle@kneit.in>
|
|
* Copyright (c) 2018 Kyle Evans <kevans@FreeBSD.org>
|
|
* Copyright (c) 2019 Wes Maag <wes@jwmaag.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 <sys/mntent.h>
|
|
|
|
#include "be.h"
|
|
#include "be_impl.h"
|
|
|
|
struct be_mountcheck_info {
|
|
const char *path;
|
|
char *name;
|
|
};
|
|
|
|
struct be_mount_info {
|
|
libbe_handle_t *lbh;
|
|
const char *be;
|
|
const char *mountpoint;
|
|
int mntflags;
|
|
int deepmount;
|
|
int depth;
|
|
};
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Called from be_mount, uses the given zfs_handle and attempts to
|
|
* mount it at the passed mountpoint. If the deepmount flag is set, continue
|
|
* calling the function for each child dataset.
|
|
*/
|
|
static int
|
|
be_mount_iter(zfs_handle_t *zfs_hdl, void *data)
|
|
{
|
|
int err;
|
|
char *mountpoint;
|
|
char tmp[BE_MAXPATHLEN], zfs_mnt[BE_MAXPATHLEN];
|
|
struct be_mount_info *info;
|
|
char opt;
|
|
|
|
info = (struct be_mount_info *)data;
|
|
|
|
if (zfs_is_mounted(zfs_hdl, &mountpoint)) {
|
|
free(mountpoint);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* canmount and mountpoint are both ignored for the BE dataset, because
|
|
* the rest of the system (kernel and loader) will effectively do the
|
|
* same.
|
|
*/
|
|
if (info->depth == 0) {
|
|
snprintf(tmp, BE_MAXPATHLEN, "%s", info->mountpoint);
|
|
} else {
|
|
if (zfs_prop_get_int(zfs_hdl, ZFS_PROP_CANMOUNT) ==
|
|
ZFS_CANMOUNT_OFF)
|
|
return (0);
|
|
|
|
if (zfs_prop_get(zfs_hdl, ZFS_PROP_MOUNTPOINT, zfs_mnt,
|
|
BE_MAXPATHLEN, NULL, NULL, 0, 1))
|
|
return (1);
|
|
|
|
/*
|
|
* We've encountered mountpoint=none at some intermediate
|
|
* dataset (e.g. zroot/var) that will have children that may
|
|
* need to be mounted. Skip mounting it, but iterate through
|
|
* the children.
|
|
*/
|
|
if (strcmp("none", zfs_mnt) == 0)
|
|
goto skipmount;
|
|
|
|
mountpoint = be_mountpoint_augmented(info->lbh, zfs_mnt);
|
|
snprintf(tmp, BE_MAXPATHLEN, "%s%s", info->mountpoint,
|
|
mountpoint);
|
|
}
|
|
|
|
opt = '\0';
|
|
if ((err = zmount(zfs_get_name(zfs_hdl), tmp, info->mntflags,
|
|
__DECONST(char *, MNTTYPE_ZFS), NULL, 0, &opt, 1)) != 0) {
|
|
switch (errno) {
|
|
case ENAMETOOLONG:
|
|
return (set_error(info->lbh, BE_ERR_PATHLEN));
|
|
case ELOOP:
|
|
case ENOENT:
|
|
case ENOTDIR:
|
|
return (set_error(info->lbh, BE_ERR_BADPATH));
|
|
case EPERM:
|
|
return (set_error(info->lbh, BE_ERR_PERMS));
|
|
case EBUSY:
|
|
return (set_error(info->lbh, BE_ERR_PATHBUSY));
|
|
default:
|
|
return (set_error(info->lbh, BE_ERR_UNKNOWN));
|
|
}
|
|
}
|
|
|
|
if (!info->deepmount)
|
|
return (0);
|
|
|
|
skipmount:
|
|
++info->depth;
|
|
err = zfs_iter_filesystems(zfs_hdl, be_mount_iter, info);
|
|
--info->depth;
|
|
return (err);
|
|
}
|
|
|
|
|
|
static int
|
|
be_umount_iter(zfs_handle_t *zfs_hdl, void *data)
|
|
{
|
|
|
|
int err;
|
|
char *mountpoint;
|
|
struct be_mount_info *info;
|
|
|
|
info = (struct be_mount_info *)data;
|
|
|
|
++info->depth;
|
|
if((err = zfs_iter_filesystems(zfs_hdl, be_umount_iter, info)) != 0) {
|
|
return (err);
|
|
}
|
|
--info->depth;
|
|
|
|
if (!zfs_is_mounted(zfs_hdl, &mountpoint)) {
|
|
return (0);
|
|
}
|
|
free(mountpoint);
|
|
|
|
if (zfs_unmount(zfs_hdl, NULL, info->mntflags) != 0) {
|
|
switch (errno) {
|
|
case ENAMETOOLONG:
|
|
return (set_error(info->lbh, BE_ERR_PATHLEN));
|
|
case ELOOP:
|
|
case ENOENT:
|
|
case ENOTDIR:
|
|
return (set_error(info->lbh, BE_ERR_BADPATH));
|
|
case EPERM:
|
|
return (set_error(info->lbh, BE_ERR_PERMS));
|
|
case EBUSY:
|
|
return (set_error(info->lbh, BE_ERR_PATHBUSY));
|
|
default:
|
|
return (set_error(info->lbh, BE_ERR_UNKNOWN));
|
|
}
|
|
}
|
|
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, mntdeep;
|
|
int err;
|
|
struct be_mount_info info;
|
|
zfs_handle_t *zhdl;
|
|
|
|
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));
|
|
|
|
mntdeep = (flags & BE_MNT_DEEP) ? 1 : 0;
|
|
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));
|
|
}
|
|
|
|
if ((zhdl = zfs_open(lbh->lzh, be, ZFS_TYPE_FILESYSTEM)) == NULL)
|
|
return (set_error(lbh, BE_ERR_ZFSOPEN));
|
|
|
|
info.lbh = lbh;
|
|
info.be = be;
|
|
info.mountpoint = (mountpoint == NULL) ? mnt_temp : mountpoint;
|
|
info.mntflags = mntflags;
|
|
info.deepmount = mntdeep;
|
|
info.depth = 0;
|
|
|
|
if((err = be_mount_iter(zhdl, &info) != 0)) {
|
|
zfs_close(zhdl);
|
|
return (err);
|
|
}
|
|
zfs_close(zhdl);
|
|
|
|
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;
|
|
char be[BE_MAXPATHLEN];
|
|
zfs_handle_t *root_hdl;
|
|
struct be_mount_info info;
|
|
|
|
if ((err = be_root_concat(lbh, bootenv, be)) != 0)
|
|
return (set_error(lbh, err));
|
|
|
|
if ((root_hdl = zfs_open(lbh->lzh, be, ZFS_TYPE_FILESYSTEM)) == NULL)
|
|
return (set_error(lbh, BE_ERR_ZFSOPEN));
|
|
|
|
info.lbh = lbh;
|
|
info.be = be;
|
|
info.mountpoint = NULL;
|
|
info.mntflags = (flags & BE_MNT_FORCE) ? MS_FORCE : 0;
|
|
info.depth = 0;
|
|
|
|
if ((err = be_umount_iter(root_hdl, &info)) != 0) {
|
|
zfs_close(root_hdl);
|
|
return (err);
|
|
}
|
|
|
|
zfs_close(root_hdl);
|
|
return (BE_ERR_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* This function will blow away the input buffer as needed if we're discovered
|
|
* to be looking at a root-mount. If the mountpoint is naturally beyond the
|
|
* root, however, the buffer may be left intact and a pointer to the section
|
|
* past altroot will be returned instead for the caller's perusal.
|
|
*/
|
|
char *
|
|
be_mountpoint_augmented(libbe_handle_t *lbh, char *mountpoint)
|
|
{
|
|
|
|
if (lbh->altroot_len == 0)
|
|
return (mountpoint);
|
|
if (mountpoint == NULL || *mountpoint == '\0')
|
|
return (mountpoint);
|
|
|
|
if (mountpoint[lbh->altroot_len] == '\0') {
|
|
*(mountpoint + 1) = '\0';
|
|
return (mountpoint);
|
|
} else
|
|
return (mountpoint + lbh->altroot_len);
|
|
}
|