OpenSolaris_b135/cmd/zoneadm/zfs.c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* This file contains the functions used to support the ZFS integration
* with zones. This includes validation (e.g. zonecfg dataset), cloning,
* file system creation and destruction.
*/
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <locale.h>
#include <libintl.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <libgen.h>
#include <libzonecfg.h>
#include <sys/mnttab.h>
#include <libzfs.h>
#include <sys/mntent.h>
#include <values.h>
#include <strings.h>
#include <assert.h>
#include "zoneadm.h"
libzfs_handle_t *g_zfs;
typedef struct zfs_mount_data {
char *match_name;
zfs_handle_t *match_handle;
} zfs_mount_data_t;
typedef struct zfs_snapshot_data {
char *match_name; /* zonename@SUNWzone */
int len; /* strlen of match_name */
int max; /* highest digit appended to snap name */
int num; /* number of snapshots to rename */
int cntr; /* counter for renaming snapshots */
} zfs_snapshot_data_t;
typedef struct clone_data {
zfs_handle_t *clone_zhp; /* clone dataset to promote */
time_t origin_creation; /* snapshot creation time of clone */
const char *snapshot; /* snapshot of dataset being demoted */
} clone_data_t;
/*
* A ZFS file system iterator call-back function which is used to validate
* datasets imported into the zone.
*/
/* ARGSUSED */
static int
check_zvol(zfs_handle_t *zhp, void *unused)
{
int ret;
if (zfs_get_type(zhp) == ZFS_TYPE_VOLUME) {
/*
* TRANSLATION_NOTE
* zfs and dataset are literals that should not be translated.
*/
(void) fprintf(stderr, gettext("cannot verify zfs dataset %s: "
"volumes cannot be specified as a zone dataset resource\n"),
zfs_get_name(zhp));
ret = -1;
} else {
ret = zfs_iter_children(zhp, check_zvol, NULL);
}
zfs_close(zhp);
return (ret);
}
/*
* A ZFS file system iterator call-back function which returns the
* zfs_handle_t for a ZFS file system on the specified mount point.
*/
static int
match_mountpoint(zfs_handle_t *zhp, void *data)
{
int res;
zfs_mount_data_t *cbp;
char mp[ZFS_MAXPROPLEN];
if (zfs_get_type(zhp) != ZFS_TYPE_FILESYSTEM) {
zfs_close(zhp);
return (0);
}
/* First check if the dataset is mounted. */
if (zfs_prop_get(zhp, ZFS_PROP_MOUNTED, mp, sizeof (mp), NULL, NULL,
0, B_FALSE) != 0 || strcmp(mp, "no") == 0) {
zfs_close(zhp);
return (0);
}
/* Now check mount point. */
if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mp, sizeof (mp), NULL, NULL,
0, B_FALSE) != 0) {
zfs_close(zhp);
return (0);
}
cbp = (zfs_mount_data_t *)data;
if (strcmp(mp, "legacy") == 0) {
/* If legacy, must look in mnttab for mountpoint. */
FILE *fp;
struct mnttab entry;
const char *nm;
nm = zfs_get_name(zhp);
if ((fp = fopen(MNTTAB, "r")) == NULL) {
zfs_close(zhp);
return (0);
}
while (getmntent(fp, &entry) == 0) {
if (strcmp(nm, entry.mnt_special) == 0) {
if (strcmp(entry.mnt_mountp, cbp->match_name)
== 0) {
(void) fclose(fp);
cbp->match_handle = zhp;
return (1);
}
break;
}
}
(void) fclose(fp);
} else if (strcmp(mp, cbp->match_name) == 0) {
cbp->match_handle = zhp;
return (1);
}
/* Iterate over any nested datasets. */
res = zfs_iter_filesystems(zhp, match_mountpoint, data);
zfs_close(zhp);
return (res);
}
/*
* Get ZFS handle for the specified mount point.
*/
static zfs_handle_t *
mount2zhandle(char *mountpoint)
{
zfs_mount_data_t cb;
cb.match_name = mountpoint;
cb.match_handle = NULL;
(void) zfs_iter_root(g_zfs, match_mountpoint, &cb);
return (cb.match_handle);
}
/*
* Check if there is already a file system (zfs or any other type) mounted on
* path.
*/
static boolean_t
is_mountpnt(char *path)
{
FILE *fp;
struct mnttab entry;
if ((fp = fopen(MNTTAB, "r")) == NULL)
return (B_FALSE);
while (getmntent(fp, &entry) == 0) {
if (strcmp(path, entry.mnt_mountp) == 0) {
(void) fclose(fp);
return (B_TRUE);
}
}
(void) fclose(fp);
return (B_FALSE);
}
/*
* Run the brand's pre-snapshot hook before we take a ZFS snapshot of the zone.
*/
static int
pre_snapshot(char *presnapbuf)
{
int status;
/* No brand-specific handler */
if (presnapbuf[0] == '\0')
return (Z_OK);
/* Run the hook */
status = do_subproc(presnapbuf);
if ((status = subproc_status(gettext("brand-specific presnapshot"),
status, B_FALSE)) != ZONE_SUBPROC_OK)
return (Z_ERR);
return (Z_OK);
}
/*
* Run the brand's post-snapshot hook after we take a ZFS snapshot of the zone.
*/
static int
post_snapshot(char *postsnapbuf)
{
int status;
/* No brand-specific handler */
if (postsnapbuf[0] == '\0')
return (Z_OK);
/* Run the hook */
status = do_subproc(postsnapbuf);
if ((status = subproc_status(gettext("brand-specific postsnapshot"),
status, B_FALSE)) != ZONE_SUBPROC_OK)
return (Z_ERR);
return (Z_OK);
}
/*
* This is a ZFS snapshot iterator call-back function which returns the
* highest number of SUNWzone snapshots that have been taken.
*/
static int
get_snap_max(zfs_handle_t *zhp, void *data)
{
int res;
zfs_snapshot_data_t *cbp;
if (zfs_get_type(zhp) != ZFS_TYPE_SNAPSHOT) {
zfs_close(zhp);
return (0);
}
cbp = (zfs_snapshot_data_t *)data;
if (strncmp(zfs_get_name(zhp), cbp->match_name, cbp->len) == 0) {
char *nump;
int num;
cbp->num++;
nump = (char *)(zfs_get_name(zhp) + cbp->len);
num = atoi(nump);
if (num > cbp->max)
cbp->max = num;
}
res = zfs_iter_snapshots(zhp, get_snap_max, data);
zfs_close(zhp);
return (res);
}
/*
* Take a ZFS snapshot to be used for cloning the zone.
*/
static int
take_snapshot(zfs_handle_t *zhp, char *snapshot_name, int snap_size,
char *presnapbuf, char *postsnapbuf)
{
int res;
char template[ZFS_MAXNAMELEN];
zfs_snapshot_data_t cb;
/*
* First we need to figure out the next available name for the
* zone snapshot. Look through the list of zones snapshots for
* this file system to determine the maximum snapshot name.
*/
if (snprintf(template, sizeof (template), "%s@SUNWzone",
zfs_get_name(zhp)) >= sizeof (template))
return (Z_ERR);
cb.match_name = template;
cb.len = strlen(template);
cb.max = 0;
if (zfs_iter_snapshots(zhp, get_snap_max, &cb) != 0)
return (Z_ERR);
cb.max++;
if (snprintf(snapshot_name, snap_size, "%s@SUNWzone%d",
zfs_get_name(zhp), cb.max) >= snap_size)
return (Z_ERR);
if (pre_snapshot(presnapbuf) != Z_OK)
return (Z_ERR);
res = zfs_snapshot(g_zfs, snapshot_name, B_FALSE, NULL);
if (post_snapshot(postsnapbuf) != Z_OK)
return (Z_ERR);
if (res != 0)
return (Z_ERR);
return (Z_OK);
}
/*
* We are using an explicit snapshot from some earlier point in time so
* we need to validate it. Run the brand specific hook.
*/
static int
validate_snapshot(char *snapshot_name, char *snap_path, char *validsnapbuf)
{
int status;
char cmdbuf[MAXPATHLEN];
/* No brand-specific handler */
if (validsnapbuf[0] == '\0')
return (Z_OK);
/* pass args - snapshot_name & snap_path */
if (snprintf(cmdbuf, sizeof (cmdbuf), "%s %s %s", validsnapbuf,
snapshot_name, snap_path) >= sizeof (cmdbuf)) {
zerror("Command line too long");
return (Z_ERR);
}
/* Run the hook */
status = do_subproc(cmdbuf);
if ((status = subproc_status(gettext("brand-specific validatesnapshot"),
status, B_FALSE)) != ZONE_SUBPROC_OK)
return (Z_ERR);
return (Z_OK);
}
/*
* Remove the sw inventory file from inside this zonepath that we picked up out
* of the snapshot.
*/
static int
clean_out_clone()
{
int err;
zone_dochandle_t handle;
if ((handle = zonecfg_init_handle()) == NULL) {
zperror(cmd_to_str(CMD_CLONE), B_TRUE);
return (Z_ERR);
}
if ((err = zonecfg_get_handle(target_zone, handle)) != Z_OK) {
errno = err;
zperror(cmd_to_str(CMD_CLONE), B_TRUE);
zonecfg_fini_handle(handle);
return (Z_ERR);
}
zonecfg_rm_detached(handle, B_FALSE);
zonecfg_fini_handle(handle);
return (Z_OK);
}
/*
* Make a ZFS clone on zonepath from snapshot_name.
*/
static int
clone_snap(char *snapshot_name, char *zonepath)
{
int res = Z_OK;
int err;
zfs_handle_t *zhp;
zfs_handle_t *clone;
nvlist_t *props = NULL;
if ((zhp = zfs_open(g_zfs, snapshot_name, ZFS_TYPE_SNAPSHOT)) == NULL)
return (Z_NO_ENTRY);
(void) printf(gettext("Cloning snapshot %s\n"), snapshot_name);
if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0 ||
nvlist_add_string(props, zfs_prop_to_name(ZFS_PROP_SHARENFS),
"off") != 0) {
if (props != NULL)
nvlist_free(props);
(void) fprintf(stderr, gettext("could not create ZFS clone "
"%s: out of memory\n"), zonepath);
return (Z_ERR);
}
err = zfs_clone(zhp, zonepath, props);
zfs_close(zhp);
nvlist_free(props);
if (err != 0)
return (Z_ERR);
/* create the mountpoint if necessary */
if ((clone = zfs_open(g_zfs, zonepath, ZFS_TYPE_DATASET)) == NULL)
return (Z_ERR);
/*
* The clone has been created so we need to print a diagnostic
* message if one of the following steps fails for some reason.
*/
if (zfs_mount(clone, NULL, 0) != 0) {
(void) fprintf(stderr, gettext("could not mount ZFS clone "
"%s\n"), zfs_get_name(clone));
res = Z_ERR;
} else if (clean_out_clone() != Z_OK) {
(void) fprintf(stderr, gettext("could not remove the "
"software inventory from ZFS clone %s\n"),
zfs_get_name(clone));
res = Z_ERR;
}
zfs_close(clone);
return (res);
}
/*
* This function takes a zonepath and attempts to determine what the ZFS
* file system name (not mountpoint) should be for that path. We do not
* assume that zonepath is an existing directory or ZFS fs since we use
* this function as part of the process of creating a new ZFS fs or clone.
*
* The way this works is that we look at the parent directory of the zonepath
* to see if it is a ZFS fs. If it is, we get the name of that ZFS fs and
* append the last component of the zonepath to generate the ZFS name for the
* zonepath. This matches the algorithm that ZFS uses for automatically
* mounting a new fs after it is created.
*
* Although a ZFS fs can be mounted anywhere, we don't worry about handling
* all of the complexity that a user could possibly configure with arbitrary
* mounts since there is no way to generate a ZFS name from a random path in
* the file system. We only try to handle the automatic mounts that ZFS does
* for each file system. ZFS restricts this so that a new fs must be created
* in an existing parent ZFS fs. It then automatically mounts the new fs
* directly under the mountpoint for the parent fs using the last component
* of the name as the mountpoint directory.
*
* For example:
* Name Mountpoint
* space/eng/dev/test/zone1 /project1/eng/dev/test/zone1
*
* Return Z_OK if the path mapped to a ZFS file system name, otherwise return
* Z_ERR.
*/
static int
path2name(char *zonepath, char *zfs_name, int len)
{
int res;
char *bnm, *dnm, *dname, *bname;
zfs_handle_t *zhp;
struct stat stbuf;
/*
* We need two tmp strings to handle paths directly in / (e.g. /foo)
* since dirname will overwrite the first char after "/" in this case.
*/
if ((bnm = strdup(zonepath)) == NULL)
return (Z_ERR);
if ((dnm = strdup(zonepath)) == NULL) {
free(bnm);
return (Z_ERR);
}
bname = basename(bnm);
dname = dirname(dnm);
/*
* This is a quick test to save iterating over all of the zfs datasets
* on the system (which can be a lot). If the parent dir is not in a
* ZFS fs, then we're done.
*/
if (stat(dname, &stbuf) != 0 || !S_ISDIR(stbuf.st_mode) ||
strcmp(stbuf.st_fstype, MNTTYPE_ZFS) != 0) {
free(bnm);
free(dnm);
return (Z_ERR);
}
/* See if the parent directory is its own ZFS dataset. */
if ((zhp = mount2zhandle(dname)) == NULL) {
/*
* The parent is not a ZFS dataset so we can't automatically
* create a dataset on the given path.
*/
free(bnm);
free(dnm);
return (Z_ERR);
}
res = snprintf(zfs_name, len, "%s/%s", zfs_get_name(zhp), bname);
free(bnm);
free(dnm);
zfs_close(zhp);
if (res >= len)
return (Z_ERR);
return (Z_OK);
}
/*
* A ZFS file system iterator call-back function used to determine if the
* file system has dependents (snapshots & clones).
*/
/* ARGSUSED */
static int
has_dependent(zfs_handle_t *zhp, void *data)
{
zfs_close(zhp);
return (1);
}
/*
* Given a snapshot name, get the file system path where the snapshot lives.
* A snapshot name is of the form fs_name@snap_name. For example, snapshot
* pl/zones/z1@SUNWzone1 would have a path of
* /pl/zones/z1/.zfs/snapshot/SUNWzone1.
*/
static int
snap2path(char *snap_name, char *path, int len)
{
char *p;
zfs_handle_t *zhp;
char mp[ZFS_MAXPROPLEN];
if ((p = strrchr(snap_name, '@')) == NULL)
return (Z_ERR);
/* Get the file system name from the snap_name. */
*p = '\0';
zhp = zfs_open(g_zfs, snap_name, ZFS_TYPE_DATASET);
*p = '@';
if (zhp == NULL)
return (Z_ERR);
/* Get the file system mount point. */
if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, mp, sizeof (mp), NULL, NULL,
0, B_FALSE) != 0) {
zfs_close(zhp);
return (Z_ERR);
}
zfs_close(zhp);
p++;
if (snprintf(path, len, "%s/.zfs/snapshot/%s", mp, p) >= len)
return (Z_ERR);
return (Z_OK);
}
/*
* This callback function is used to iterate through a snapshot's dependencies
* to find a filesystem that is a direct clone of the snapshot being iterated.
*/
static int
get_direct_clone(zfs_handle_t *zhp, void *data)
{
clone_data_t *cd = data;
char origin[ZFS_MAXNAMELEN];
char ds_path[ZFS_MAXNAMELEN];
if (zfs_get_type(zhp) != ZFS_TYPE_FILESYSTEM) {
zfs_close(zhp);
return (0);
}
(void) strlcpy(ds_path, zfs_get_name(zhp), sizeof (ds_path));
/* Make sure this is a direct clone of the snapshot we're iterating. */
if (zfs_prop_get(zhp, ZFS_PROP_ORIGIN, origin, sizeof (origin), NULL,
NULL, 0, B_FALSE) != 0 || strcmp(origin, cd->snapshot) != 0) {
zfs_close(zhp);
return (0);
}
if (cd->clone_zhp != NULL)
zfs_close(cd->clone_zhp);
cd->clone_zhp = zhp;
return (1);
}
/*
* A ZFS file system iterator call-back function used to determine the clone
* to promote. This function finds the youngest (i.e. last one taken) snapshot
* that has a clone. If found, it returns a reference to that clone in the
* callback data.
*/
static int
find_clone(zfs_handle_t *zhp, void *data)
{
clone_data_t *cd = data;
time_t snap_creation;
int zret = 0;
/* If snapshot has no clones, skip it */
if (zfs_prop_get_int(zhp, ZFS_PROP_NUMCLONES) == 0) {
zfs_close(zhp);
return (0);
}
cd->snapshot = zfs_get_name(zhp);
/* Get the creation time of this snapshot */
snap_creation = (time_t)zfs_prop_get_int(zhp, ZFS_PROP_CREATION);
/*
* If this snapshot's creation time is greater than (i.e. younger than)
* the current youngest snapshot found, iterate this snapshot to
* get the right clone.
*/
if (snap_creation >= cd->origin_creation) {
/*
* Iterate the dependents of this snapshot to find a clone
* that's a direct dependent.
*/
if ((zret = zfs_iter_dependents(zhp, B_FALSE, get_direct_clone,
cd)) == -1) {
zfs_close(zhp);
return (1);
} else if (zret == 1) {
/*
* Found a clone, update the origin_creation time
* in the callback data.
*/
cd->origin_creation = snap_creation;
}
}
zfs_close(zhp);
return (0);
}
/*
* A ZFS file system iterator call-back function used to remove standalone
* snapshots.
*/
/* ARGSUSED */
static int
rm_snap(zfs_handle_t *zhp, void *data)
{
/* If snapshot has clones, something is wrong */
if (zfs_prop_get_int(zhp, ZFS_PROP_NUMCLONES) != 0) {
zfs_close(zhp);
return (1);
}
if (zfs_unmount(zhp, NULL, 0) == 0) {
(void) zfs_destroy(zhp, B_FALSE);
}
zfs_close(zhp);
return (0);
}
/*
* A ZFS snapshot iterator call-back function which renames snapshots.
*/
static int
rename_snap(zfs_handle_t *zhp, void *data)
{
int res;
zfs_snapshot_data_t *cbp;
char template[ZFS_MAXNAMELEN];
cbp = (zfs_snapshot_data_t *)data;
/*
* When renaming snapshots with the iterator, the iterator can see
* the same snapshot after we've renamed up in the namespace. To
* prevent this we check the count for the number of snapshots we have
* to rename and stop at that point.
*/
if (cbp->cntr >= cbp->num) {
zfs_close(zhp);
return (0);
}
if (zfs_get_type(zhp) != ZFS_TYPE_SNAPSHOT) {
zfs_close(zhp);
return (0);
}
/* Only rename the snapshots we automatically generate when we clone. */
if (strncmp(zfs_get_name(zhp), cbp->match_name, cbp->len) != 0) {
zfs_close(zhp);
return (0);
}
(void) snprintf(template, sizeof (template), "%s%d", cbp->match_name,
cbp->max++);
res = (zfs_rename(zhp, template, B_FALSE) != 0);
if (res != 0)
(void) fprintf(stderr, gettext("failed to rename snapshot %s "
"to %s: %s\n"), zfs_get_name(zhp), template,
libzfs_error_description(g_zfs));
cbp->cntr++;
zfs_close(zhp);
return (res);
}
/*
* Rename the source dataset's snapshots that are automatically generated when
* we clone a zone so that there won't be a name collision when we promote the
* cloned dataset. Once the snapshots have been renamed, then promote the
* clone.
*
* The snapshot rename process gets the highest number on the snapshot names
* (the format is zonename@SUNWzoneXX where XX are digits) on both the source
* and clone datasets, then renames the source dataset snapshots starting at
* the next number.
*/
static int
promote_clone(zfs_handle_t *src_zhp, zfs_handle_t *cln_zhp)
{
zfs_snapshot_data_t sd;
char nm[ZFS_MAXNAMELEN];
char template[ZFS_MAXNAMELEN];
(void) strlcpy(nm, zfs_get_name(cln_zhp), sizeof (nm));
/*
* Start by getting the clone's snapshot max which we use
* during the rename of the original dataset's snapshots.
*/
(void) snprintf(template, sizeof (template), "%s@SUNWzone", nm);
sd.match_name = template;
sd.len = strlen(template);
sd.max = 0;
if (zfs_iter_snapshots(cln_zhp, get_snap_max, &sd) != 0)
return (Z_ERR);
/*
* Now make sure the source's snapshot max is at least as high as
* the clone's snapshot max.
*/
(void) snprintf(template, sizeof (template), "%s@SUNWzone",
zfs_get_name(src_zhp));
sd.match_name = template;
sd.len = strlen(template);
sd.num = 0;
if (zfs_iter_snapshots(src_zhp, get_snap_max, &sd) != 0)
return (Z_ERR);
/*
* Now rename the source dataset's snapshots so there's no
* conflict when we promote the clone.
*/
sd.max++;
sd.cntr = 0;
if (zfs_iter_snapshots(src_zhp, rename_snap, &sd) != 0)
return (Z_ERR);
/* close and reopen the clone dataset to get the latest info */
zfs_close(cln_zhp);
if ((cln_zhp = zfs_open(g_zfs, nm, ZFS_TYPE_FILESYSTEM)) == NULL)
return (Z_ERR);
if (zfs_promote(cln_zhp) != 0) {
(void) fprintf(stderr, gettext("failed to promote %s: %s\n"),
nm, libzfs_error_description(g_zfs));
return (Z_ERR);
}
zfs_close(cln_zhp);
return (Z_OK);
}
/*
* Promote the youngest clone. That clone will then become the origin of all
* of the other clones that were hanging off of the source dataset.
*/
int
promote_all_clones(zfs_handle_t *zhp)
{
clone_data_t cd;
char nm[ZFS_MAXNAMELEN];
cd.clone_zhp = NULL;
cd.origin_creation = 0;
cd.snapshot = NULL;
if (zfs_iter_snapshots(zhp, find_clone, &cd) != 0) {
zfs_close(zhp);
return (Z_ERR);
}
/* Nothing to promote. */
if (cd.clone_zhp == NULL)
return (Z_OK);
/* Found the youngest clone to promote. Promote it. */
if (promote_clone(zhp, cd.clone_zhp) != 0) {
zfs_close(cd.clone_zhp);
zfs_close(zhp);
return (Z_ERR);
}
/* close and reopen the main dataset to get the latest info */
(void) strlcpy(nm, zfs_get_name(zhp), sizeof (nm));
zfs_close(zhp);
if ((zhp = zfs_open(g_zfs, nm, ZFS_TYPE_FILESYSTEM)) == NULL)
return (Z_ERR);
return (Z_OK);
}
/*
* Clone a pre-existing ZFS snapshot, either by making a direct ZFS clone, if
* possible, or by copying the data from the snapshot to the zonepath.
*/
int
clone_snapshot_zfs(char *snap_name, char *zonepath, char *validatesnap)
{
int err = Z_OK;
char clone_name[MAXPATHLEN];
char snap_path[MAXPATHLEN];
if (snap2path(snap_name, snap_path, sizeof (snap_path)) != Z_OK) {
(void) fprintf(stderr, gettext("unable to find path for %s.\n"),
snap_name);
return (Z_ERR);
}
if (validate_snapshot(snap_name, snap_path, validatesnap) != Z_OK)
return (Z_NO_ENTRY);
/*
* The zonepath cannot be ZFS cloned, try to copy the data from
* within the snapshot to the zonepath.
*/
if (path2name(zonepath, clone_name, sizeof (clone_name)) != Z_OK) {
if ((err = clone_copy(snap_path, zonepath)) == Z_OK)
if (clean_out_clone() != Z_OK)
(void) fprintf(stderr,
gettext("could not remove the "
"software inventory from %s\n"), zonepath);
return (err);
}
if ((err = clone_snap(snap_name, clone_name)) != Z_OK) {
if (err != Z_NO_ENTRY) {
/*
* Cloning the snapshot failed. Fall back to trying
* to install the zone by copying from the snapshot.
*/
if ((err = clone_copy(snap_path, zonepath)) == Z_OK)
if (clean_out_clone() != Z_OK)
(void) fprintf(stderr,
gettext("could not remove the "
"software inventory from %s\n"),
zonepath);
} else {
/*
* The snapshot is unusable for some reason so restore
* the zone state to configured since we were unable to
* actually do anything about getting the zone
* installed.
*/
int tmp;
if ((tmp = zone_set_state(target_zone,
ZONE_STATE_CONFIGURED)) != Z_OK) {
errno = tmp;
zperror2(target_zone,
gettext("could not set state"));
}
}
}
return (err);
}
/*
* Attempt to clone a source_zone to a target zonepath by using a ZFS clone.
*/
int
clone_zfs(char *source_zonepath, char *zonepath, char *presnapbuf,
char *postsnapbuf)
{
zfs_handle_t *zhp;
char clone_name[MAXPATHLEN];
char snap_name[MAXPATHLEN];
/*
* Try to get a zfs handle for the source_zonepath. If this fails
* the source_zonepath is not ZFS so return an error.
*/
if ((zhp = mount2zhandle(source_zonepath)) == NULL)
return (Z_ERR);
/*
* Check if there is a file system already mounted on zonepath. If so,
* we can't clone to the path so we should fall back to copying.
*/
if (is_mountpnt(zonepath)) {
zfs_close(zhp);
(void) fprintf(stderr,
gettext("A file system is already mounted on %s,\n"
"preventing use of a ZFS clone.\n"), zonepath);
return (Z_ERR);
}
/*
* Instead of using path2name to get the clone name from the zonepath,
* we could generate a name from the source zone ZFS name. However,
* this would mean we would create the clone under the ZFS fs of the
* source instead of what the zonepath says. For example,
*
* source_zonepath zonepath
* /pl/zones/dev/z1 /pl/zones/deploy/z2
*
* We don't want the clone to be under "dev", we want it under
* "deploy", so that we can leverage the normal attribute inheritance
* that ZFS provides in the fs hierarchy.
*/
if (path2name(zonepath, clone_name, sizeof (clone_name)) != Z_OK) {
zfs_close(zhp);
return (Z_ERR);
}
if (take_snapshot(zhp, snap_name, sizeof (snap_name), presnapbuf,
postsnapbuf) != Z_OK) {
zfs_close(zhp);
return (Z_ERR);
}
zfs_close(zhp);
if (clone_snap(snap_name, clone_name) != Z_OK) {
/* Clean up the snapshot we just took. */
if ((zhp = zfs_open(g_zfs, snap_name, ZFS_TYPE_SNAPSHOT))
!= NULL) {
if (zfs_unmount(zhp, NULL, 0) == 0)
(void) zfs_destroy(zhp, B_FALSE);
zfs_close(zhp);
}
return (Z_ERR);
}
(void) printf(gettext("Instead of copying, a ZFS clone has been "
"created for this zone.\n"));
return (Z_OK);
}
/*
* Attempt to create a ZFS file system for the specified zonepath.
* We either will successfully create a ZFS file system and get it mounted
* on the zonepath or we don't. The caller doesn't care since a regular
* directory is used for the zonepath if no ZFS file system is mounted there.
*/
void
create_zfs_zonepath(char *zonepath)
{
zfs_handle_t *zhp;
char zfs_name[MAXPATHLEN];
nvlist_t *props = NULL;
if (path2name(zonepath, zfs_name, sizeof (zfs_name)) != Z_OK)
return;
/* Check if the dataset already exists. */
if ((zhp = zfs_open(g_zfs, zfs_name, ZFS_TYPE_DATASET)) != NULL) {
zfs_close(zhp);
return;
}
if (nvlist_alloc(&props, NV_UNIQUE_NAME, 0) != 0 ||
nvlist_add_string(props, zfs_prop_to_name(ZFS_PROP_SHARENFS),
"off") != 0) {
if (props != NULL)
nvlist_free(props);
(void) fprintf(stderr, gettext("cannot create ZFS dataset %s: "
"out of memory\n"), zfs_name);
}
if (zfs_create(g_zfs, zfs_name, ZFS_TYPE_FILESYSTEM, props) != 0 ||
(zhp = zfs_open(g_zfs, zfs_name, ZFS_TYPE_DATASET)) == NULL) {
(void) fprintf(stderr, gettext("cannot create ZFS dataset %s: "
"%s\n"), zfs_name, libzfs_error_description(g_zfs));
nvlist_free(props);
return;
}
nvlist_free(props);
if (zfs_mount(zhp, NULL, 0) != 0) {
(void) fprintf(stderr, gettext("cannot mount ZFS dataset %s: "
"%s\n"), zfs_name, libzfs_error_description(g_zfs));
(void) zfs_destroy(zhp, B_FALSE);
} else {
if (chmod(zonepath, S_IRWXU) != 0) {
(void) fprintf(stderr, gettext("file system %s "
"successfully created, but chmod %o failed: %s\n"),
zfs_name, S_IRWXU, strerror(errno));
(void) destroy_zfs(zonepath);
} else {
(void) printf(gettext("A ZFS file system has been "
"created for this zone.\n"));
}
}
zfs_close(zhp);
}
/*
* If the zonepath is a ZFS file system, attempt to destroy it. We return Z_OK
* if we were able to zfs_destroy the zonepath, otherwise we return Z_ERR
* which means the caller should clean up the zonepath in the traditional
* way.
*/
int
destroy_zfs(char *zonepath)
{
zfs_handle_t *zhp;
boolean_t is_clone = B_FALSE;
char origin[ZFS_MAXPROPLEN];
if ((zhp = mount2zhandle(zonepath)) == NULL)
return (Z_ERR);
if (promote_all_clones(zhp) != 0)
return (Z_ERR);
/* Now cleanup any snapshots remaining. */
if (zfs_iter_snapshots(zhp, rm_snap, NULL) != 0) {
zfs_close(zhp);
return (Z_ERR);
}
/*
* We can't destroy the file system if it has still has dependents.
* There shouldn't be any at this point, but we'll double check.
*/
if (zfs_iter_dependents(zhp, B_TRUE, has_dependent, NULL) != 0) {
(void) fprintf(stderr, gettext("zfs destroy %s failed: the "
"dataset still has dependents\n"), zfs_get_name(zhp));
zfs_close(zhp);
return (Z_ERR);
}
/*
* This might be a clone. Try to get the snapshot so we can attempt
* to destroy that as well.
*/
if (zfs_prop_get(zhp, ZFS_PROP_ORIGIN, origin, sizeof (origin), NULL,
NULL, 0, B_FALSE) == 0)
is_clone = B_TRUE;
if (zfs_unmount(zhp, NULL, 0) != 0) {
(void) fprintf(stderr, gettext("zfs unmount %s failed: %s\n"),
zfs_get_name(zhp), libzfs_error_description(g_zfs));
zfs_close(zhp);
return (Z_ERR);
}
if (zfs_destroy(zhp, B_FALSE) != 0) {
/*
* If the destroy fails for some reason, try to remount
* the file system so that we can use "rm -rf" to clean up
* instead.
*/
(void) fprintf(stderr, gettext("zfs destroy %s failed: %s\n"),
zfs_get_name(zhp), libzfs_error_description(g_zfs));
(void) zfs_mount(zhp, NULL, 0);
zfs_close(zhp);
return (Z_ERR);
}
/*
* If the zone has ever been moved then the mountpoint dir will not be
* cleaned up by the zfs_destroy(). To handle this case try to clean
* it up now but don't worry if it fails, that will be normal.
*/
(void) rmdir(zonepath);
(void) printf(gettext("The ZFS file system for this zone has been "
"destroyed.\n"));
if (is_clone) {
zfs_handle_t *ohp;
/*
* Try to clean up the snapshot that the clone was taken from.
*/
if ((ohp = zfs_open(g_zfs, origin,
ZFS_TYPE_SNAPSHOT)) != NULL) {
if (zfs_iter_dependents(ohp, B_TRUE, has_dependent,
NULL) == 0 && zfs_unmount(ohp, NULL, 0) == 0)
(void) zfs_destroy(ohp, B_FALSE);
zfs_close(ohp);
}
}
zfs_close(zhp);
return (Z_OK);
}
/*
* Return true if the path is its own zfs file system. We determine this
* by stat-ing the path to see if it is zfs and stat-ing the parent to see
* if it is a different fs.
*/
boolean_t
is_zonepath_zfs(char *zonepath)
{
int res;
char *path;
char *parent;
struct statvfs64 buf1, buf2;
if (statvfs64(zonepath, &buf1) != 0)
return (B_FALSE);
if (strcmp(buf1.f_basetype, "zfs") != 0)
return (B_FALSE);
if ((path = strdup(zonepath)) == NULL)
return (B_FALSE);
parent = dirname(path);
res = statvfs64(parent, &buf2);
free(path);
if (res != 0)
return (B_FALSE);
if (buf1.f_fsid == buf2.f_fsid)
return (B_FALSE);
return (B_TRUE);
}
/*
* Implement the fast move of a ZFS file system by simply updating the
* mountpoint. Since it is file system already, we don't have the
* issue of cross-file system copying.
*/
int
move_zfs(char *zonepath, char *new_zonepath)
{
int ret = Z_ERR;
zfs_handle_t *zhp;
if ((zhp = mount2zhandle(zonepath)) == NULL)
return (Z_ERR);
if (zfs_prop_set(zhp, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT),
new_zonepath) == 0) {
/*
* Clean up the old mount point. We ignore any failure since
* the zone is already successfully mounted on the new path.
*/
(void) rmdir(zonepath);
ret = Z_OK;
}
zfs_close(zhp);
return (ret);
}
/*
* Validate that the given dataset exists on the system, and that neither it nor
* its children are zvols.
*
* Note that we don't do anything with the 'zoned' property here. All
* management is done in zoneadmd when the zone is actually rebooted. This
* allows us to automatically set the zoned property even when a zone is
* rebooted by the administrator.
*/
int
verify_datasets(zone_dochandle_t handle)
{
int return_code = Z_OK;
struct zone_dstab dstab;
zfs_handle_t *zhp;
char propbuf[ZFS_MAXPROPLEN];
char source[ZFS_MAXNAMELEN];
zprop_source_t srctype;
if (zonecfg_setdsent(handle) != Z_OK) {
/*
* TRANSLATION_NOTE
* zfs and dataset are literals that should not be translated.
*/
(void) fprintf(stderr, gettext("could not verify zfs datasets: "
"unable to enumerate datasets\n"));
return (Z_ERR);
}
while (zonecfg_getdsent(handle, &dstab) == Z_OK) {
if ((zhp = zfs_open(g_zfs, dstab.zone_dataset_name,
ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME)) == NULL) {
(void) fprintf(stderr, gettext("could not verify zfs "
"dataset %s: %s\n"), dstab.zone_dataset_name,
libzfs_error_description(g_zfs));
return_code = Z_ERR;
continue;
}
if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, propbuf,
sizeof (propbuf), &srctype, source,
sizeof (source), 0) == 0 &&
(srctype == ZPROP_SRC_INHERITED)) {
(void) fprintf(stderr, gettext("could not verify zfs "
"dataset %s: mountpoint cannot be inherited\n"),
dstab.zone_dataset_name);
return_code = Z_ERR;
zfs_close(zhp);
continue;
}
if (zfs_get_type(zhp) == ZFS_TYPE_VOLUME) {
(void) fprintf(stderr, gettext("cannot verify zfs "
"dataset %s: volumes cannot be specified as a "
"zone dataset resource\n"),
dstab.zone_dataset_name);
return_code = Z_ERR;
}
if (zfs_iter_children(zhp, check_zvol, NULL) != 0)
return_code = Z_ERR;
zfs_close(zhp);
}
(void) zonecfg_enddsent(handle);
return (return_code);
}
/*
* Verify that the ZFS dataset exists, and its mountpoint
* property is set to "legacy".
*/
int
verify_fs_zfs(struct zone_fstab *fstab)
{
zfs_handle_t *zhp;
char propbuf[ZFS_MAXPROPLEN];
if ((zhp = zfs_open(g_zfs, fstab->zone_fs_special,
ZFS_TYPE_DATASET)) == NULL) {
(void) fprintf(stderr, gettext("could not verify fs %s: "
"could not access zfs dataset '%s'\n"),
fstab->zone_fs_dir, fstab->zone_fs_special);
return (Z_ERR);
}
if (zfs_get_type(zhp) != ZFS_TYPE_FILESYSTEM) {
(void) fprintf(stderr, gettext("cannot verify fs %s: "
"'%s' is not a file system\n"),
fstab->zone_fs_dir, fstab->zone_fs_special);
zfs_close(zhp);
return (Z_ERR);
}
if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, propbuf, sizeof (propbuf),
NULL, NULL, 0, 0) != 0 || strcmp(propbuf, "legacy") != 0) {
(void) fprintf(stderr, gettext("could not verify fs %s: "
"zfs '%s' mountpoint is not \"legacy\"\n"),
fstab->zone_fs_dir, fstab->zone_fs_special);
zfs_close(zhp);
return (Z_ERR);
}
zfs_close(zhp);
return (Z_OK);
}
/*
* Destroy the specified mnttab structure that was created by mnttab_dup().
* NOTE: The structure's mnt_time field isn't freed.
*/
static void
mnttab_destroy(struct mnttab *tabp)
{
assert(tabp != NULL);
free(tabp->mnt_mountp);
free(tabp->mnt_special);
free(tabp->mnt_fstype);
free(tabp->mnt_mntopts);
free(tabp);
}
/*
* Duplicate the specified mnttab structure. The mnt_mountp and mnt_time
* fields aren't duplicated. This function returns a pointer to the new mnttab
* structure or NULL if an error occurred. If an error occurs, then this
* function sets errno to reflect the error. mnttab structures created by
* this function should be destroyed via mnttab_destroy().
*/
static struct mnttab *
mnttab_dup(const struct mnttab *srcp)
{
struct mnttab *retval;
assert(srcp != NULL);
retval = (struct mnttab *)calloc(1, sizeof (*retval));
if (retval == NULL) {
errno = ENOMEM;
return (NULL);
}
if (srcp->mnt_special != NULL) {
retval->mnt_special = strdup(srcp->mnt_special);
if (retval->mnt_special == NULL)
goto err;
}
if (srcp->mnt_fstype != NULL) {
retval->mnt_fstype = strdup(srcp->mnt_fstype);
if (retval->mnt_fstype == NULL)
goto err;
}
retval->mnt_mntopts = (char *)malloc(MAX_MNTOPT_STR * sizeof (char));
if (retval->mnt_mntopts == NULL)
goto err;
if (srcp->mnt_mntopts != NULL) {
if (strlcpy(retval->mnt_mntopts, srcp->mnt_mntopts,
MAX_MNTOPT_STR * sizeof (char)) >= MAX_MNTOPT_STR *
sizeof (char)) {
mnttab_destroy(retval);
errno = EOVERFLOW; /* similar to mount(2) behavior */
return (NULL);
}
} else {
retval->mnt_mntopts[0] = '\0';
}
return (retval);
err:
mnttab_destroy(retval);
errno = ENOMEM;
return (NULL);
}
/*
* Determine whether the specified ZFS dataset's mountpoint property is set
* to "legacy". If the specified dataset does not have a legacy mountpoint,
* then the string pointer to which the mountpoint argument points is assigned
* a dynamically-allocated string containing the dataset's mountpoint
* property. If the dataset's mountpoint property is "legacy" or a libzfs
* error occurs, then the string pointer to which the mountpoint argument
* points isn't modified.
*
* This function returns B_TRUE if it doesn't encounter any fatal errors.
* It returns B_FALSE if it encounters a fatal error and sets errno to the
* appropriate error code.
*/
static boolean_t
get_zfs_non_legacy_mountpoint(const char *dataset_name, char **mountpoint)
{
zfs_handle_t *zhp;
char propbuf[ZFS_MAXPROPLEN];
assert(dataset_name != NULL);
assert(mountpoint != NULL);
if ((zhp = zfs_open(g_zfs, dataset_name, ZFS_TYPE_DATASET)) == NULL) {
errno = EINVAL;
return (B_FALSE);
}
if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, propbuf, sizeof (propbuf),
NULL, NULL, 0, 0) != 0) {
zfs_close(zhp);
errno = EINVAL;
return (B_FALSE);
}
zfs_close(zhp);
if (strcmp(propbuf, "legacy") != 0) {
if ((*mountpoint = strdup(propbuf)) == NULL) {
errno = ENOMEM;
return (B_FALSE);
}
}
return (B_TRUE);
}
/*
* This zonecfg_find_mounts() callback records information about mounts of
* interest in a zonepath. It also tallies the number of zone
* root overlay mounts and the number of unexpected mounts found.
* This function outputs errors using zerror() if it finds unexpected
* mounts. cookiep should point to an initialized zone_mounts_t structure.
*
* This function returns zero on success and a nonzero value on failure.
*/
static int
zone_mounts_cb(const struct mnttab *mountp, void *cookiep)
{
zone_mounts_t *mounts;
const char *zone_mount_dir;
assert(mountp != NULL);
assert(cookiep != NULL);
mounts = (zone_mounts_t *)cookiep;
zone_mount_dir = mountp->mnt_mountp + mounts->zonepath_len;
if (strcmp(zone_mount_dir, "/root") == 0) {
/*
* Check for an overlay mount. If we already detected a /root
* mount, then the current mount must be an overlay mount.
*/
if (mounts->root_mnttab != NULL) {
mounts->num_root_overlay_mounts++;
return (0);
}
/*
* Store the root mount's mnttab information in the
* zone_mounts_t structure for future use.
*/
if ((mounts->root_mnttab = mnttab_dup(mountp)) == NULL) {
zperror(cmd_to_str(CMD_MOVE), B_FALSE);
return (-1);
}
/*
* Determine if the filesystem is a ZFS filesystem with a
* non-legacy mountpoint. If it is, then set the root
* filesystem's mnttab's mnt_mountp field to a non-NULL
* value, which will serve as a flag to indicate this special
* condition.
*/
if (strcmp(mountp->mnt_fstype, MNTTYPE_ZFS) == 0 &&
get_zfs_non_legacy_mountpoint(mountp->mnt_special,
&mounts->root_mnttab->mnt_mountp) != B_TRUE) {
zperror(cmd_to_str(CMD_MOVE), B_FALSE);
return (-1);
}
} else {
/*
* An unexpected mount was found. Notify the user.
*/
if (mounts->num_unexpected_mounts == 0)
zerror(gettext("These file systems are mounted on "
"subdirectories of %s.\n"), mounts->zonepath);
mounts->num_unexpected_mounts++;
(void) zfm_print(mountp, NULL);
}
return (0);
}
/*
* Initialize the specified zone_mounts_t structure for the given zonepath.
* If this function succeeds, it returns zero and the specified zone_mounts_t
* structure contains information about mounts in the specified zonepath.
* The function returns a nonzero value if it fails. The zone_mounts_t
* structure doesn't need be destroyed via zone_mounts_destroy() if this
* function fails.
*/
int
zone_mounts_init(zone_mounts_t *mounts, const char *zonepath)
{
assert(mounts != NULL);
assert(zonepath != NULL);
bzero(mounts, sizeof (*mounts));
if ((mounts->zonepath = strdup(zonepath)) == NULL) {
zerror(gettext("the process ran out of memory while checking "
"for mounts in zonepath %s."), zonepath);
return (-1);
}
mounts->zonepath_len = strlen(zonepath);
if (zonecfg_find_mounts((char *)zonepath, zone_mounts_cb, mounts) ==
-1) {
zerror(gettext("an error occurred while checking for mounts "
"in zonepath %s."), zonepath);
zone_mounts_destroy(mounts);
return (-1);
}
return (0);
}
/*
* Destroy the memory used by the specified zone_mounts_t structure's fields.
* This function doesn't free the memory occupied by the structure itself
* (i.e., it doesn't free the parameter).
*/
void
zone_mounts_destroy(zone_mounts_t *mounts)
{
assert(mounts != NULL);
free(mounts->zonepath);
if (mounts->root_mnttab != NULL)
mnttab_destroy(mounts->root_mnttab);
}
/*
* Mount a moving zone's root filesystem (if it had a root filesystem mount
* prior to the move) using the specified zonepath. mounts should refer to
* the zone_mounts_t structure describing the zone's mount information.
*
* This function returns zero if the mount succeeds and a nonzero value
* if it doesn't.
*/
int
zone_mount_rootfs(zone_mounts_t *mounts, const char *zonepath)
{
char zoneroot[MAXPATHLEN];
struct mnttab *mtab;
int flags;
assert(mounts != NULL);
assert(zonepath != NULL);
/*
* If there isn't a root filesystem, then don't do anything.
*/
mtab = mounts->root_mnttab;
if (mtab == NULL)
return (0);
/*
* Determine the root filesystem's new mountpoint.
*/
if (snprintf(zoneroot, sizeof (zoneroot), "%s/root", zonepath) >=
sizeof (zoneroot)) {
zerror(gettext("Zonepath %s is too long.\n"), zonepath);
return (-1);
}
/*
* If the root filesystem is a non-legacy ZFS filesystem (i.e., if it's
* mnt_mountp field is non-NULL), then make the filesystem's new
* mount point its mountpoint property and mount the filesystem.
*/
if (mtab->mnt_mountp != NULL) {
zfs_handle_t *zhp;
if ((zhp = zfs_open(g_zfs, mtab->mnt_special,
ZFS_TYPE_DATASET)) == NULL) {
zerror(gettext("could not get ZFS handle for the zone's"
" root filesystem"));
return (-1);
}
if (zfs_prop_set(zhp, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT),
zoneroot) != 0) {
zerror(gettext("could not modify zone's root "
"filesystem's mountpoint property"));
zfs_close(zhp);
return (-1);
}
if (zfs_mount(zhp, mtab->mnt_mntopts, 0) != 0) {
zerror(gettext("unable to mount zone root %s: %s"),
zoneroot, libzfs_error_description(g_zfs));
if (zfs_prop_set(zhp,
zfs_prop_to_name(ZFS_PROP_MOUNTPOINT),
mtab->mnt_mountp) != 0)
zerror(gettext("unable to restore zone's root "
"filesystem's mountpoint property"));
zfs_close(zhp);
return (-1);
}
zfs_close(zhp);
return (0);
}
/*
* The root filesystem is either a legacy-mounted ZFS filesystem or
* a non-ZFS filesystem. Use mount(2) to mount the root filesystem.
*/
if (mtab->mnt_mntopts != NULL)
flags = MS_OPTIONSTR;
else
flags = 0;
if (mount(mtab->mnt_special, zoneroot, flags, mtab->mnt_fstype, NULL, 0,
mtab->mnt_mntopts, MAX_MNTOPT_STR * sizeof (char)) != 0) {
flags = errno;
zerror(gettext("unable to mount zone root %s: %s"), zoneroot,
strerror(flags));
return (-1);
}
return (0);
}
/*
* Unmount a moving zone's root filesystem (if such a mount exists) using the
* specified zonepath. mounts should refer to the zone_mounts_t structure
* describing the zone's mount information. If force is B_TRUE, then if the
* unmount fails, then the function will try to forcibly unmount the zone's root
* filesystem.
*
* This function returns zero if the unmount (forced or otherwise) succeeds;
* otherwise, it returns a nonzero value.
*/
int
zone_unmount_rootfs(zone_mounts_t *mounts, const char *zonepath,
boolean_t force)
{
char zoneroot[MAXPATHLEN];
struct mnttab *mtab;
int err;
assert(mounts != NULL);
assert(zonepath != NULL);
/*
* If there isn't a root filesystem, then don't do anything.
*/
mtab = mounts->root_mnttab;
if (mtab == NULL)
return (0);
/*
* Determine the root filesystem's mountpoint.
*/
if (snprintf(zoneroot, sizeof (zoneroot), "%s/root", zonepath) >=
sizeof (zoneroot)) {
zerror(gettext("Zonepath %s is too long.\n"), zonepath);
return (-1);
}
/*
* If the root filesystem is a non-legacy ZFS fileystem, then unmount
* the filesystem via libzfs.
*/
if (mtab->mnt_mountp != NULL) {
zfs_handle_t *zhp;
if ((zhp = zfs_open(g_zfs, mtab->mnt_special,
ZFS_TYPE_DATASET)) == NULL) {
zerror(gettext("could not get ZFS handle for the zone's"
" root filesystem"));
return (-1);
}
if (zfs_unmount(zhp, zoneroot, 0) != 0) {
if (force && zfs_unmount(zhp, zoneroot, MS_FORCE) ==
0) {
zfs_close(zhp);
return (0);
}
zerror(gettext("unable to unmount zone root %s: %s"),
zoneroot, libzfs_error_description(g_zfs));
zfs_close(zhp);
return (-1);
}
zfs_close(zhp);
return (0);
}
/*
* Use umount(2) to unmount the root filesystem. If this fails, then
* forcibly unmount it if the force flag is set.
*/
if (umount(zoneroot) != 0) {
if (force && umount2(zoneroot, MS_FORCE) == 0)
return (0);
err = errno;
zerror(gettext("unable to unmount zone root %s: %s"), zoneroot,
strerror(err));
return (-1);
}
return (0);
}
int
init_zfs(void)
{
if ((g_zfs = libzfs_init()) == NULL) {
(void) fprintf(stderr, gettext("failed to initialize ZFS "
"library\n"));
return (Z_ERR);
}
return (Z_OK);
}