OpenSolaris_b135/lib/libzfs/common/libzfs_mount.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 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Routines to manage ZFS mounts. We separate all the nasty routines that have
* to deal with the OS. The following functions are the main entry points --
* they are used by mount and unmount and when changing a filesystem's
* mountpoint.
*
* zfs_is_mounted()
* zfs_mount()
* zfs_unmount()
* zfs_unmountall()
*
* This file also contains the functions used to manage sharing filesystems via
* NFS and iSCSI:
*
* zfs_is_shared()
* zfs_share()
* zfs_unshare()
*
* zfs_is_shared_nfs()
* zfs_is_shared_smb()
* zfs_is_shared_iscsi()
* zfs_share_proto()
* zfs_shareall();
* zfs_share_iscsi()
* zfs_unshare_nfs()
* zfs_unshare_smb()
* zfs_unshareall_nfs()
* zfs_unshareall_smb()
* zfs_unshareall()
* zfs_unshareall_bypath()
* zfs_unshare_iscsi()
*
* The following functions are available for pool consumers, and will
* mount/unmount and share/unshare all datasets within pool:
*
* zpool_enable_datasets()
* zpool_disable_datasets()
*/
#include <dirent.h>
#include <dlfcn.h>
#include <errno.h>
#include <libgen.h>
#include <libintl.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <zone.h>
#include <sys/mntent.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <libzfs.h>
#include "libzfs_impl.h"
#include <libshare.h>
#include <sys/systeminfo.h>
#define MAXISALEN 257 /* based on sysinfo(2) man page */
static int zfs_share_proto(zfs_handle_t *, zfs_share_proto_t *);
zfs_share_type_t zfs_is_shared_proto(zfs_handle_t *, char **,
zfs_share_proto_t);
static int (*iscsitgt_zfs_share)(const char *);
static int (*iscsitgt_zfs_unshare)(const char *);
static int (*iscsitgt_zfs_is_shared)(const char *);
static int (*iscsitgt_svc_online)();
/*
* The share protocols table must be in the same order as the zfs_share_prot_t
* enum in libzfs_impl.h
*/
typedef struct {
zfs_prop_t p_prop;
char *p_name;
int p_share_err;
int p_unshare_err;
} proto_table_t;
proto_table_t proto_table[PROTO_END] = {
{ZFS_PROP_SHARENFS, "nfs", EZFS_SHARENFSFAILED, EZFS_UNSHARENFSFAILED},
{ZFS_PROP_SHARESMB, "smb", EZFS_SHARESMBFAILED, EZFS_UNSHARESMBFAILED},
};
zfs_share_proto_t nfs_only[] = {
PROTO_NFS,
PROTO_END
};
zfs_share_proto_t smb_only[] = {
PROTO_SMB,
PROTO_END
};
zfs_share_proto_t share_all_proto[] = {
PROTO_NFS,
PROTO_SMB,
PROTO_END
};
#pragma init(zfs_iscsi_init)
static void
zfs_iscsi_init(void)
{
void *libiscsitgt;
if ((libiscsitgt = dlopen("/lib/libiscsitgt.so.1",
RTLD_LAZY | RTLD_GLOBAL)) == NULL ||
(iscsitgt_zfs_share = (int (*)(const char *))dlsym(libiscsitgt,
"iscsitgt_zfs_share")) == NULL ||
(iscsitgt_zfs_unshare = (int (*)(const char *))dlsym(libiscsitgt,
"iscsitgt_zfs_unshare")) == NULL ||
(iscsitgt_zfs_is_shared = (int (*)(const char *))dlsym(libiscsitgt,
"iscsitgt_zfs_is_shared")) == NULL ||
(iscsitgt_svc_online = (int (*)(const char *))dlsym(libiscsitgt,
"iscsitgt_svc_online")) == NULL) {
iscsitgt_zfs_share = NULL;
iscsitgt_zfs_unshare = NULL;
iscsitgt_zfs_is_shared = NULL;
iscsitgt_svc_online = NULL;
}
}
/*
* Search the sharetab for the given mountpoint and protocol, returning
* a zfs_share_type_t value.
*/
static zfs_share_type_t
is_shared(libzfs_handle_t *hdl, const char *mountpoint, zfs_share_proto_t proto)
{
char buf[MAXPATHLEN], *tab;
char *ptr;
if (hdl->libzfs_sharetab == NULL)
return (SHARED_NOT_SHARED);
(void) fseek(hdl->libzfs_sharetab, 0, SEEK_SET);
while (fgets(buf, sizeof (buf), hdl->libzfs_sharetab) != NULL) {
/* the mountpoint is the first entry on each line */
if ((tab = strchr(buf, '\t')) == NULL)
continue;
*tab = '\0';
if (strcmp(buf, mountpoint) == 0) {
/*
* the protocol field is the third field
* skip over second field
*/
ptr = ++tab;
if ((tab = strchr(ptr, '\t')) == NULL)
continue;
ptr = ++tab;
if ((tab = strchr(ptr, '\t')) == NULL)
continue;
*tab = '\0';
if (strcmp(ptr,
proto_table[proto].p_name) == 0) {
switch (proto) {
case PROTO_NFS:
return (SHARED_NFS);
case PROTO_SMB:
return (SHARED_SMB);
default:
return (0);
}
}
}
}
return (SHARED_NOT_SHARED);
}
/*
* Returns true if the specified directory is empty. If we can't open the
* directory at all, return true so that the mount can fail with a more
* informative error message.
*/
static boolean_t
dir_is_empty(const char *dirname)
{
DIR *dirp;
struct dirent64 *dp;
if ((dirp = opendir(dirname)) == NULL)
return (B_TRUE);
while ((dp = readdir64(dirp)) != NULL) {
if (strcmp(dp->d_name, ".") == 0 ||
strcmp(dp->d_name, "..") == 0)
continue;
(void) closedir(dirp);
return (B_FALSE);
}
(void) closedir(dirp);
return (B_TRUE);
}
/*
* Checks to see if the mount is active. If the filesystem is mounted, we fill
* in 'where' with the current mountpoint, and return 1. Otherwise, we return
* 0.
*/
boolean_t
is_mounted(libzfs_handle_t *zfs_hdl, const char *special, char **where)
{
struct mnttab entry;
if (libzfs_mnttab_find(zfs_hdl, special, &entry) != 0)
return (B_FALSE);
if (where != NULL)
*where = zfs_strdup(zfs_hdl, entry.mnt_mountp);
return (B_TRUE);
}
boolean_t
zfs_is_mounted(zfs_handle_t *zhp, char **where)
{
return (is_mounted(zhp->zfs_hdl, zfs_get_name(zhp), where));
}
/*
* Returns true if the given dataset is mountable, false otherwise. Returns the
* mountpoint in 'buf'.
*/
static boolean_t
zfs_is_mountable(zfs_handle_t *zhp, char *buf, size_t buflen,
zprop_source_t *source)
{
char sourceloc[ZFS_MAXNAMELEN];
zprop_source_t sourcetype;
if (!zfs_prop_valid_for_type(ZFS_PROP_MOUNTPOINT, zhp->zfs_type))
return (B_FALSE);
verify(zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, buf, buflen,
&sourcetype, sourceloc, sizeof (sourceloc), B_FALSE) == 0);
if (strcmp(buf, ZFS_MOUNTPOINT_NONE) == 0 ||
strcmp(buf, ZFS_MOUNTPOINT_LEGACY) == 0)
return (B_FALSE);
if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_OFF)
return (B_FALSE);
if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED) &&
getzoneid() == GLOBAL_ZONEID)
return (B_FALSE);
if (source)
*source = sourcetype;
return (B_TRUE);
}
/*
* Mount the given filesystem.
*/
int
zfs_mount(zfs_handle_t *zhp, const char *options, int flags)
{
struct stat buf;
char mountpoint[ZFS_MAXPROPLEN];
char mntopts[MNT_LINE_MAX];
libzfs_handle_t *hdl = zhp->zfs_hdl;
if (options == NULL)
mntopts[0] = '\0';
else
(void) strlcpy(mntopts, options, sizeof (mntopts));
if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL))
return (0);
/* Create the directory if it doesn't already exist */
if (lstat(mountpoint, &buf) != 0) {
if (mkdirp(mountpoint, 0755) != 0) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"failed to create mountpoint"));
return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
mountpoint));
}
}
/*
* Determine if the mountpoint is empty. If so, refuse to perform the
* mount. We don't perform this check if MS_OVERLAY is specified, which
* would defeat the point. We also avoid this check if 'remount' is
* specified.
*/
if ((flags & MS_OVERLAY) == 0 &&
strstr(mntopts, MNTOPT_REMOUNT) == NULL &&
!dir_is_empty(mountpoint)) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"directory is not empty"));
return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
dgettext(TEXT_DOMAIN, "cannot mount '%s'"), mountpoint));
}
/* perform the mount */
if (mount(zfs_get_name(zhp), mountpoint, MS_OPTIONSTR | flags,
MNTTYPE_ZFS, NULL, 0, mntopts, sizeof (mntopts)) != 0) {
/*
* Generic errors are nasty, but there are just way too many
* from mount(), and they're well-understood. We pick a few
* common ones to improve upon.
*/
if (errno == EBUSY) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"mountpoint or dataset is busy"));
} else if (errno == EPERM) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"Insufficient privileges"));
} else if (errno == ENOTSUP) {
char buf[256];
(void) snprintf(buf, sizeof (buf),
dgettext(TEXT_DOMAIN, "Mismatched versions: File "
"system is version %llu on-disk format, which is "
"incompatible with this software version %lld!"),
(u_longlong_t)zfs_prop_get_int(zhp,
ZFS_PROP_VERSION), ZPL_VERSION);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, buf));
} else {
zfs_error_aux(hdl, strerror(errno));
}
return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
zhp->zfs_name));
}
/* add the mounted entry into our cache */
libzfs_mnttab_add(hdl, zfs_get_name(zhp), mountpoint,
mntopts);
return (0);
}
/*
* Unmount a single filesystem.
*/
static int
unmount_one(libzfs_handle_t *hdl, const char *mountpoint, int flags)
{
if (umount2(mountpoint, flags) != 0) {
zfs_error_aux(hdl, strerror(errno));
return (zfs_error_fmt(hdl, EZFS_UMOUNTFAILED,
dgettext(TEXT_DOMAIN, "cannot unmount '%s'"),
mountpoint));
}
return (0);
}
/*
* Unmount the given filesystem.
*/
int
zfs_unmount(zfs_handle_t *zhp, const char *mountpoint, int flags)
{
libzfs_handle_t *hdl = zhp->zfs_hdl;
struct mnttab entry;
char *mntpt = NULL;
/* check to see if we need to unmount the filesystem */
if (mountpoint != NULL || ((zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) &&
libzfs_mnttab_find(hdl, zhp->zfs_name, &entry) == 0)) {
/*
* mountpoint may have come from a call to
* getmnt/getmntany if it isn't NULL. If it is NULL,
* we know it comes from libzfs_mnttab_find which can
* then get freed later. We strdup it to play it safe.
*/
if (mountpoint == NULL)
mntpt = zfs_strdup(hdl, entry.mnt_mountp);
else
mntpt = zfs_strdup(hdl, mountpoint);
/*
* Unshare and unmount the filesystem
*/
if (zfs_unshare_proto(zhp, mntpt, share_all_proto) != 0)
return (-1);
if (unmount_one(hdl, mntpt, flags) != 0) {
free(mntpt);
(void) zfs_shareall(zhp);
return (-1);
}
libzfs_mnttab_remove(hdl, zhp->zfs_name);
free(mntpt);
}
return (0);
}
/*
* Unmount this filesystem and any children inheriting the mountpoint property.
* To do this, just act like we're changing the mountpoint property, but don't
* remount the filesystems afterwards.
*/
int
zfs_unmountall(zfs_handle_t *zhp, int flags)
{
prop_changelist_t *clp;
int ret;
clp = changelist_gather(zhp, ZFS_PROP_MOUNTPOINT, 0, flags);
if (clp == NULL)
return (-1);
ret = changelist_prefix(clp);
changelist_free(clp);
return (ret);
}
boolean_t
zfs_is_shared(zfs_handle_t *zhp)
{
zfs_share_type_t rc = 0;
zfs_share_proto_t *curr_proto;
if (ZFS_IS_VOLUME(zhp))
return (zfs_is_shared_iscsi(zhp));
for (curr_proto = share_all_proto; *curr_proto != PROTO_END;
curr_proto++)
rc |= zfs_is_shared_proto(zhp, NULL, *curr_proto);
return (rc ? B_TRUE : B_FALSE);
}
int
zfs_share(zfs_handle_t *zhp)
{
if (ZFS_IS_VOLUME(zhp))
return (zfs_share_iscsi(zhp));
return (zfs_share_proto(zhp, share_all_proto));
}
int
zfs_unshare(zfs_handle_t *zhp)
{
if (ZFS_IS_VOLUME(zhp))
return (zfs_unshare_iscsi(zhp));
return (zfs_unshareall(zhp));
}
/*
* Check to see if the filesystem is currently shared.
*/
zfs_share_type_t
zfs_is_shared_proto(zfs_handle_t *zhp, char **where, zfs_share_proto_t proto)
{
char *mountpoint;
zfs_share_type_t rc;
if (!zfs_is_mounted(zhp, &mountpoint))
return (SHARED_NOT_SHARED);
if (rc = is_shared(zhp->zfs_hdl, mountpoint, proto)) {
if (where != NULL)
*where = mountpoint;
else
free(mountpoint);
return (rc);
} else {
free(mountpoint);
return (SHARED_NOT_SHARED);
}
}
boolean_t
zfs_is_shared_nfs(zfs_handle_t *zhp, char **where)
{
return (zfs_is_shared_proto(zhp, where,
PROTO_NFS) != SHARED_NOT_SHARED);
}
boolean_t
zfs_is_shared_smb(zfs_handle_t *zhp, char **where)
{
return (zfs_is_shared_proto(zhp, where,
PROTO_SMB) != SHARED_NOT_SHARED);
}
/*
* Make sure things will work if libshare isn't installed by using
* wrapper functions that check to see that the pointers to functions
* initialized in _zfs_init_libshare() are actually present.
*/
static sa_handle_t (*_sa_init)(int);
static void (*_sa_fini)(sa_handle_t);
static sa_share_t (*_sa_find_share)(sa_handle_t, char *);
static int (*_sa_enable_share)(sa_share_t, char *);
static int (*_sa_disable_share)(sa_share_t, char *);
static char *(*_sa_errorstr)(int);
static int (*_sa_parse_legacy_options)(sa_group_t, char *, char *);
static boolean_t (*_sa_needs_refresh)(sa_handle_t *);
static libzfs_handle_t *(*_sa_get_zfs_handle)(sa_handle_t);
static int (*_sa_zfs_process_share)(sa_handle_t, sa_group_t, sa_share_t,
char *, char *, zprop_source_t, char *, char *, char *);
static void (*_sa_update_sharetab_ts)(sa_handle_t);
/*
* _zfs_init_libshare()
*
* Find the libshare.so.1 entry points that we use here and save the
* values to be used later. This is triggered by the runtime loader.
* Make sure the correct ISA version is loaded.
*/
#pragma init(_zfs_init_libshare)
static void
_zfs_init_libshare(void)
{
void *libshare;
char path[MAXPATHLEN];
char isa[MAXISALEN];
#if defined(_LP64)
if (sysinfo(SI_ARCHITECTURE_64, isa, MAXISALEN) == -1)
isa[0] = '\0';
#else
isa[0] = '\0';
#endif
(void) snprintf(path, MAXPATHLEN,
"/usr/lib/%s/libshare.so.1", isa);
if ((libshare = dlopen(path, RTLD_LAZY | RTLD_GLOBAL)) != NULL) {
_sa_init = (sa_handle_t (*)(int))dlsym(libshare, "sa_init");
_sa_fini = (void (*)(sa_handle_t))dlsym(libshare, "sa_fini");
_sa_find_share = (sa_share_t (*)(sa_handle_t, char *))
dlsym(libshare, "sa_find_share");
_sa_enable_share = (int (*)(sa_share_t, char *))dlsym(libshare,
"sa_enable_share");
_sa_disable_share = (int (*)(sa_share_t, char *))dlsym(libshare,
"sa_disable_share");
_sa_errorstr = (char *(*)(int))dlsym(libshare, "sa_errorstr");
_sa_parse_legacy_options = (int (*)(sa_group_t, char *, char *))
dlsym(libshare, "sa_parse_legacy_options");
_sa_needs_refresh = (boolean_t (*)(sa_handle_t *))
dlsym(libshare, "sa_needs_refresh");
_sa_get_zfs_handle = (libzfs_handle_t *(*)(sa_handle_t))
dlsym(libshare, "sa_get_zfs_handle");
_sa_zfs_process_share = (int (*)(sa_handle_t, sa_group_t,
sa_share_t, char *, char *, zprop_source_t, char *,
char *, char *))dlsym(libshare, "sa_zfs_process_share");
_sa_update_sharetab_ts = (void (*)(sa_handle_t))
dlsym(libshare, "sa_update_sharetab_ts");
if (_sa_init == NULL || _sa_fini == NULL ||
_sa_find_share == NULL || _sa_enable_share == NULL ||
_sa_disable_share == NULL || _sa_errorstr == NULL ||
_sa_parse_legacy_options == NULL ||
_sa_needs_refresh == NULL || _sa_get_zfs_handle == NULL ||
_sa_zfs_process_share == NULL ||
_sa_update_sharetab_ts == NULL) {
_sa_init = NULL;
_sa_fini = NULL;
_sa_disable_share = NULL;
_sa_enable_share = NULL;
_sa_errorstr = NULL;
_sa_parse_legacy_options = NULL;
(void) dlclose(libshare);
_sa_needs_refresh = NULL;
_sa_get_zfs_handle = NULL;
_sa_zfs_process_share = NULL;
_sa_update_sharetab_ts = NULL;
}
}
}
/*
* zfs_init_libshare(zhandle, service)
*
* Initialize the libshare API if it hasn't already been initialized.
* In all cases it returns 0 if it succeeded and an error if not. The
* service value is which part(s) of the API to initialize and is a
* direct map to the libshare sa_init(service) interface.
*/
int
zfs_init_libshare(libzfs_handle_t *zhandle, int service)
{
int ret = SA_OK;
if (_sa_init == NULL)
ret = SA_CONFIG_ERR;
if (ret == SA_OK && zhandle->libzfs_shareflags & ZFSSHARE_MISS) {
/*
* We had a cache miss. Most likely it is a new ZFS
* dataset that was just created. We want to make sure
* so check timestamps to see if a different process
* has updated any of the configuration. If there was
* some non-ZFS change, we need to re-initialize the
* internal cache.
*/
zhandle->libzfs_shareflags &= ~ZFSSHARE_MISS;
if (_sa_needs_refresh != NULL &&
_sa_needs_refresh(zhandle->libzfs_sharehdl)) {
zfs_uninit_libshare(zhandle);
zhandle->libzfs_sharehdl = _sa_init(service);
}
}
if (ret == SA_OK && zhandle && zhandle->libzfs_sharehdl == NULL)
zhandle->libzfs_sharehdl = _sa_init(service);
if (ret == SA_OK && zhandle->libzfs_sharehdl == NULL)
ret = SA_NO_MEMORY;
return (ret);
}
/*
* zfs_uninit_libshare(zhandle)
*
* Uninitialize the libshare API if it hasn't already been
* uninitialized. It is OK to call multiple times.
*/
void
zfs_uninit_libshare(libzfs_handle_t *zhandle)
{
if (zhandle != NULL && zhandle->libzfs_sharehdl != NULL) {
if (_sa_fini != NULL)
_sa_fini(zhandle->libzfs_sharehdl);
zhandle->libzfs_sharehdl = NULL;
}
}
/*
* zfs_parse_options(options, proto)
*
* Call the legacy parse interface to get the protocol specific
* options using the NULL arg to indicate that this is a "parse" only.
*/
int
zfs_parse_options(char *options, zfs_share_proto_t proto)
{
if (_sa_parse_legacy_options != NULL) {
return (_sa_parse_legacy_options(NULL, options,
proto_table[proto].p_name));
}
return (SA_CONFIG_ERR);
}
/*
* zfs_sa_find_share(handle, path)
*
* wrapper around sa_find_share to find a share path in the
* configuration.
*/
static sa_share_t
zfs_sa_find_share(sa_handle_t handle, char *path)
{
if (_sa_find_share != NULL)
return (_sa_find_share(handle, path));
return (NULL);
}
/*
* zfs_sa_enable_share(share, proto)
*
* Wrapper for sa_enable_share which enables a share for a specified
* protocol.
*/
static int
zfs_sa_enable_share(sa_share_t share, char *proto)
{
if (_sa_enable_share != NULL)
return (_sa_enable_share(share, proto));
return (SA_CONFIG_ERR);
}
/*
* zfs_sa_disable_share(share, proto)
*
* Wrapper for sa_enable_share which disables a share for a specified
* protocol.
*/
static int
zfs_sa_disable_share(sa_share_t share, char *proto)
{
if (_sa_disable_share != NULL)
return (_sa_disable_share(share, proto));
return (SA_CONFIG_ERR);
}
/*
* Share the given filesystem according to the options in the specified
* protocol specific properties (sharenfs, sharesmb). We rely
* on "libshare" to the dirty work for us.
*/
static int
zfs_share_proto(zfs_handle_t *zhp, zfs_share_proto_t *proto)
{
char mountpoint[ZFS_MAXPROPLEN];
char shareopts[ZFS_MAXPROPLEN];
char sourcestr[ZFS_MAXPROPLEN];
libzfs_handle_t *hdl = zhp->zfs_hdl;
sa_share_t share;
zfs_share_proto_t *curr_proto;
zprop_source_t sourcetype;
int ret;
if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL))
return (0);
if ((ret = zfs_init_libshare(hdl, SA_INIT_SHARE_API)) != SA_OK) {
(void) zfs_error_fmt(hdl, EZFS_SHARENFSFAILED,
dgettext(TEXT_DOMAIN, "cannot share '%s': %s"),
zfs_get_name(zhp), _sa_errorstr != NULL ?
_sa_errorstr(ret) : "");
return (-1);
}
for (curr_proto = proto; *curr_proto != PROTO_END; curr_proto++) {
/*
* Return success if there are no share options.
*/
if (zfs_prop_get(zhp, proto_table[*curr_proto].p_prop,
shareopts, sizeof (shareopts), &sourcetype, sourcestr,
ZFS_MAXPROPLEN, B_FALSE) != 0 ||
strcmp(shareopts, "off") == 0)
continue;
/*
* If the 'zoned' property is set, then zfs_is_mountable()
* will have already bailed out if we are in the global zone.
* But local zones cannot be NFS servers, so we ignore it for
* local zones as well.
*/
if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED))
continue;
share = zfs_sa_find_share(hdl->libzfs_sharehdl, mountpoint);
if (share == NULL) {
/*
* This may be a new file system that was just
* created so isn't in the internal cache
* (second time through). Rather than
* reloading the entire configuration, we can
* assume ZFS has done the checking and it is
* safe to add this to the internal
* configuration.
*/
if (_sa_zfs_process_share(hdl->libzfs_sharehdl,
NULL, NULL, mountpoint,
proto_table[*curr_proto].p_name, sourcetype,
shareopts, sourcestr, zhp->zfs_name) != SA_OK) {
(void) zfs_error_fmt(hdl,
proto_table[*curr_proto].p_share_err,
dgettext(TEXT_DOMAIN, "cannot share '%s'"),
zfs_get_name(zhp));
return (-1);
}
hdl->libzfs_shareflags |= ZFSSHARE_MISS;
share = zfs_sa_find_share(hdl->libzfs_sharehdl,
mountpoint);
}
if (share != NULL) {
int err;
err = zfs_sa_enable_share(share,
proto_table[*curr_proto].p_name);
if (err != SA_OK) {
(void) zfs_error_fmt(hdl,
proto_table[*curr_proto].p_share_err,
dgettext(TEXT_DOMAIN, "cannot share '%s'"),
zfs_get_name(zhp));
return (-1);
}
} else {
(void) zfs_error_fmt(hdl,
proto_table[*curr_proto].p_share_err,
dgettext(TEXT_DOMAIN, "cannot share '%s'"),
zfs_get_name(zhp));
return (-1);
}
}
return (0);
}
int
zfs_share_nfs(zfs_handle_t *zhp)
{
return (zfs_share_proto(zhp, nfs_only));
}
int
zfs_share_smb(zfs_handle_t *zhp)
{
return (zfs_share_proto(zhp, smb_only));
}
int
zfs_shareall(zfs_handle_t *zhp)
{
return (zfs_share_proto(zhp, share_all_proto));
}
/*
* Unshare a filesystem by mountpoint.
*/
static int
unshare_one(libzfs_handle_t *hdl, const char *name, const char *mountpoint,
zfs_share_proto_t proto)
{
sa_share_t share;
int err;
char *mntpt;
/*
* Mountpoint could get trashed if libshare calls getmntany
* which it does during API initialization, so strdup the
* value.
*/
mntpt = zfs_strdup(hdl, mountpoint);
/* make sure libshare initialized */
if ((err = zfs_init_libshare(hdl, SA_INIT_SHARE_API)) != SA_OK) {
free(mntpt); /* don't need the copy anymore */
return (zfs_error_fmt(hdl, EZFS_SHARENFSFAILED,
dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
name, _sa_errorstr(err)));
}
share = zfs_sa_find_share(hdl->libzfs_sharehdl, mntpt);
free(mntpt); /* don't need the copy anymore */
if (share != NULL) {
err = zfs_sa_disable_share(share, proto_table[proto].p_name);
if (err != SA_OK) {
return (zfs_error_fmt(hdl, EZFS_UNSHARENFSFAILED,
dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
name, _sa_errorstr(err)));
}
} else {
return (zfs_error_fmt(hdl, EZFS_UNSHARENFSFAILED,
dgettext(TEXT_DOMAIN, "cannot unshare '%s': not found"),
name));
}
return (0);
}
/*
* Unshare the given filesystem.
*/
int
zfs_unshare_proto(zfs_handle_t *zhp, const char *mountpoint,
zfs_share_proto_t *proto)
{
libzfs_handle_t *hdl = zhp->zfs_hdl;
struct mnttab entry;
char *mntpt = NULL;
/* check to see if need to unmount the filesystem */
rewind(zhp->zfs_hdl->libzfs_mnttab);
if (mountpoint != NULL)
mountpoint = mntpt = zfs_strdup(hdl, mountpoint);
if (mountpoint != NULL || ((zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM) &&
libzfs_mnttab_find(hdl, zfs_get_name(zhp), &entry) == 0)) {
zfs_share_proto_t *curr_proto;
if (mountpoint == NULL)
mntpt = zfs_strdup(zhp->zfs_hdl, entry.mnt_mountp);
for (curr_proto = proto; *curr_proto != PROTO_END;
curr_proto++) {
if (is_shared(hdl, mntpt, *curr_proto) &&
unshare_one(hdl, zhp->zfs_name,
mntpt, *curr_proto) != 0) {
if (mntpt != NULL)
free(mntpt);
return (-1);
}
}
}
if (mntpt != NULL)
free(mntpt);
return (0);
}
int
zfs_unshare_nfs(zfs_handle_t *zhp, const char *mountpoint)
{
return (zfs_unshare_proto(zhp, mountpoint, nfs_only));
}
int
zfs_unshare_smb(zfs_handle_t *zhp, const char *mountpoint)
{
return (zfs_unshare_proto(zhp, mountpoint, smb_only));
}
/*
* Same as zfs_unmountall(), but for NFS and SMB unshares.
*/
int
zfs_unshareall_proto(zfs_handle_t *zhp, zfs_share_proto_t *proto)
{
prop_changelist_t *clp;
int ret;
clp = changelist_gather(zhp, ZFS_PROP_SHARENFS, 0, 0);
if (clp == NULL)
return (-1);
ret = changelist_unshare(clp, proto);
changelist_free(clp);
return (ret);
}
int
zfs_unshareall_nfs(zfs_handle_t *zhp)
{
return (zfs_unshareall_proto(zhp, nfs_only));
}
int
zfs_unshareall_smb(zfs_handle_t *zhp)
{
return (zfs_unshareall_proto(zhp, smb_only));
}
int
zfs_unshareall(zfs_handle_t *zhp)
{
return (zfs_unshareall_proto(zhp, share_all_proto));
}
int
zfs_unshareall_bypath(zfs_handle_t *zhp, const char *mountpoint)
{
return (zfs_unshare_proto(zhp, mountpoint, share_all_proto));
}
/*
* Remove the mountpoint associated with the current dataset, if necessary.
* We only remove the underlying directory if:
*
* - The mountpoint is not 'none' or 'legacy'
* - The mountpoint is non-empty
* - The mountpoint is the default or inherited
* - The 'zoned' property is set, or we're in a local zone
*
* Any other directories we leave alone.
*/
void
remove_mountpoint(zfs_handle_t *zhp)
{
char mountpoint[ZFS_MAXPROPLEN];
zprop_source_t source;
if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint),
&source))
return;
if (source == ZPROP_SRC_DEFAULT ||
source == ZPROP_SRC_INHERITED) {
/*
* Try to remove the directory, silently ignoring any errors.
* The filesystem may have since been removed or moved around,
* and this error isn't really useful to the administrator in
* any way.
*/
(void) rmdir(mountpoint);
}
}
boolean_t
zfs_is_shared_iscsi(zfs_handle_t *zhp)
{
/*
* If iscsi deamon isn't running then we aren't shared
*/
if (iscsitgt_svc_online && iscsitgt_svc_online() == 1)
return (B_FALSE);
else
return (iscsitgt_zfs_is_shared != NULL &&
iscsitgt_zfs_is_shared(zhp->zfs_name) != 0);
}
int
zfs_share_iscsi(zfs_handle_t *zhp)
{
char shareopts[ZFS_MAXPROPLEN];
const char *dataset = zhp->zfs_name;
libzfs_handle_t *hdl = zhp->zfs_hdl;
/*
* Return success if there are no share options.
*/
if (zfs_prop_get(zhp, ZFS_PROP_SHAREISCSI, shareopts,
sizeof (shareopts), NULL, NULL, 0, B_FALSE) != 0 ||
strcmp(shareopts, "off") == 0)
return (0);
if (iscsitgt_zfs_share == NULL || iscsitgt_zfs_share(dataset) != 0) {
int error = EZFS_SHAREISCSIFAILED;
/*
* If service isn't availabele and EPERM was
* returned then use special error.
*/
if (iscsitgt_svc_online && errno == EPERM &&
(iscsitgt_svc_online() != 0))
error = EZFS_ISCSISVCUNAVAIL;
return (zfs_error_fmt(hdl, error,
dgettext(TEXT_DOMAIN, "cannot share '%s'"), dataset));
}
return (0);
}
int
zfs_unshare_iscsi(zfs_handle_t *zhp)
{
const char *dataset = zfs_get_name(zhp);
libzfs_handle_t *hdl = zhp->zfs_hdl;
/*
* Return if the volume is not shared
*/
if (zfs_is_shared_iscsi(zhp) != SHARED_ISCSI)
return (0);
/*
* If this fails with ENODEV it indicates that zvol wasn't shared so
* we should return success in that case.
*/
if (iscsitgt_zfs_unshare == NULL ||
(iscsitgt_zfs_unshare(dataset) != 0 && errno != ENODEV)) {
if (errno == EPERM)
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"Insufficient privileges to unshare iscsi"));
return (zfs_error_fmt(hdl, EZFS_UNSHAREISCSIFAILED,
dgettext(TEXT_DOMAIN, "cannot unshare '%s'"), dataset));
}
return (0);
}
typedef struct mount_cbdata {
zfs_handle_t **cb_datasets;
int cb_used;
int cb_alloc;
} mount_cbdata_t;
static int
mount_cb(zfs_handle_t *zhp, void *data)
{
mount_cbdata_t *cbp = data;
if (!(zfs_get_type(zhp) & (ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME))) {
zfs_close(zhp);
return (0);
}
if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_NOAUTO) {
zfs_close(zhp);
return (0);
}
if (cbp->cb_alloc == cbp->cb_used) {
void *ptr;
if ((ptr = zfs_realloc(zhp->zfs_hdl,
cbp->cb_datasets, cbp->cb_alloc * sizeof (void *),
cbp->cb_alloc * 2 * sizeof (void *))) == NULL)
return (-1);
cbp->cb_datasets = ptr;
cbp->cb_alloc *= 2;
}
cbp->cb_datasets[cbp->cb_used++] = zhp;
return (zfs_iter_filesystems(zhp, mount_cb, cbp));
}
static int
dataset_cmp(const void *a, const void *b)
{
zfs_handle_t **za = (zfs_handle_t **)a;
zfs_handle_t **zb = (zfs_handle_t **)b;
char mounta[MAXPATHLEN];
char mountb[MAXPATHLEN];
boolean_t gota, gotb;
if ((gota = (zfs_get_type(*za) == ZFS_TYPE_FILESYSTEM)) != 0)
verify(zfs_prop_get(*za, ZFS_PROP_MOUNTPOINT, mounta,
sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
if ((gotb = (zfs_get_type(*zb) == ZFS_TYPE_FILESYSTEM)) != 0)
verify(zfs_prop_get(*zb, ZFS_PROP_MOUNTPOINT, mountb,
sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);
if (gota && gotb)
return (strcmp(mounta, mountb));
if (gota)
return (-1);
if (gotb)
return (1);
return (strcmp(zfs_get_name(a), zfs_get_name(b)));
}
/*
* Mount and share all datasets within the given pool. This assumes that no
* datasets within the pool are currently mounted. Because users can create
* complicated nested hierarchies of mountpoints, we first gather all the
* datasets and mountpoints within the pool, and sort them by mountpoint. Once
* we have the list of all filesystems, we iterate over them in order and mount
* and/or share each one.
*/
#pragma weak zpool_mount_datasets = zpool_enable_datasets
int
zpool_enable_datasets(zpool_handle_t *zhp, const char *mntopts, int flags)
{
mount_cbdata_t cb = { 0 };
libzfs_handle_t *hdl = zhp->zpool_hdl;
zfs_handle_t *zfsp;
int i, ret = -1;
int *good;
/*
* Gather all non-snap datasets within the pool.
*/
if ((cb.cb_datasets = zfs_alloc(hdl, 4 * sizeof (void *))) == NULL)
return (-1);
cb.cb_alloc = 4;
if ((zfsp = zfs_open(hdl, zhp->zpool_name, ZFS_TYPE_DATASET)) == NULL)
goto out;
cb.cb_datasets[0] = zfsp;
cb.cb_used = 1;
if (zfs_iter_filesystems(zfsp, mount_cb, &cb) != 0)
goto out;
/*
* Sort the datasets by mountpoint.
*/
qsort(cb.cb_datasets, cb.cb_used, sizeof (void *), dataset_cmp);
/*
* And mount all the datasets, keeping track of which ones
* succeeded or failed.
*/
if ((good = zfs_alloc(zhp->zpool_hdl,
cb.cb_used * sizeof (int))) == NULL)
goto out;
ret = 0;
for (i = 0; i < cb.cb_used; i++) {
if (zfs_mount(cb.cb_datasets[i], mntopts, flags) != 0)
ret = -1;
else
good[i] = 1;
}
/*
* Then share all the ones that need to be shared. This needs
* to be a separate pass in order to avoid excessive reloading
* of the configuration. Good should never be NULL since
* zfs_alloc is supposed to exit if memory isn't available.
*/
for (i = 0; i < cb.cb_used; i++) {
if (good[i] && zfs_share(cb.cb_datasets[i]) != 0)
ret = -1;
}
free(good);
out:
for (i = 0; i < cb.cb_used; i++)
zfs_close(cb.cb_datasets[i]);
free(cb.cb_datasets);
return (ret);
}
/*ARGSUSED1*/
static int
zvol_cb(zfs_handle_t *zhp, void *unused)
{
int error = 0;
if (zfs_get_type(zhp) == ZFS_TYPE_FILESYSTEM)
(void) zfs_iter_children(zhp, zvol_cb, NULL);
if (zfs_get_type(zhp) == ZFS_TYPE_VOLUME)
error = zfs_unshare_iscsi(zhp);
zfs_close(zhp);
return (error);
}
static int
mountpoint_compare(const void *a, const void *b)
{
const char *mounta = *((char **)a);
const char *mountb = *((char **)b);
return (strcmp(mountb, mounta));
}
/* alias for 2002/240 */
#pragma weak zpool_unmount_datasets = zpool_disable_datasets
/*
* Unshare and unmount all datasets within the given pool. We don't want to
* rely on traversing the DSL to discover the filesystems within the pool,
* because this may be expensive (if not all of them are mounted), and can fail
* arbitrarily (on I/O error, for example). Instead, we walk /etc/mnttab and
* gather all the filesystems that are currently mounted.
*/
int
zpool_disable_datasets(zpool_handle_t *zhp, boolean_t force)
{
int used, alloc;
struct mnttab entry;
size_t namelen;
char **mountpoints = NULL;
zfs_handle_t *zfp;
zfs_handle_t **datasets = NULL;
libzfs_handle_t *hdl = zhp->zpool_hdl;
int i;
int ret = -1;
int flags = (force ? MS_FORCE : 0);
/*
* First unshare all zvols.
*/
zfp = zfs_open(zhp->zpool_hdl, zhp->zpool_name,
ZFS_TYPE_FILESYSTEM);
if (zfp != NULL) {
(void) zfs_iter_children(zfp, zvol_cb, NULL);
zfs_close(zfp);
}
namelen = strlen(zhp->zpool_name);
rewind(hdl->libzfs_mnttab);
used = alloc = 0;
while (getmntent(hdl->libzfs_mnttab, &entry) == 0) {
/*
* Ignore non-ZFS entries.
*/
if (entry.mnt_fstype == NULL ||
strcmp(entry.mnt_fstype, MNTTYPE_ZFS) != 0)
continue;
/*
* Ignore filesystems not within this pool.
*/
if (entry.mnt_mountp == NULL ||
strncmp(entry.mnt_special, zhp->zpool_name, namelen) != 0 ||
(entry.mnt_special[namelen] != '/' &&
entry.mnt_special[namelen] != '\0'))
continue;
/*
* At this point we've found a filesystem within our pool. Add
* it to our growing list.
*/
if (used == alloc) {
if (alloc == 0) {
if ((mountpoints = zfs_alloc(hdl,
8 * sizeof (void *))) == NULL)
goto out;
if ((datasets = zfs_alloc(hdl,
8 * sizeof (void *))) == NULL)
goto out;
alloc = 8;
} else {
void *ptr;
if ((ptr = zfs_realloc(hdl, mountpoints,
alloc * sizeof (void *),
alloc * 2 * sizeof (void *))) == NULL)
goto out;
mountpoints = ptr;
if ((ptr = zfs_realloc(hdl, datasets,
alloc * sizeof (void *),
alloc * 2 * sizeof (void *))) == NULL)
goto out;
datasets = ptr;
alloc *= 2;
}
}
if ((mountpoints[used] = zfs_strdup(hdl,
entry.mnt_mountp)) == NULL)
goto out;
/*
* This is allowed to fail, in case there is some I/O error. It
* is only used to determine if we need to remove the underlying
* mountpoint, so failure is not fatal.
*/
datasets[used] = make_dataset_handle(hdl, entry.mnt_special);
used++;
}
/*
* At this point, we have the entire list of filesystems, so sort it by
* mountpoint.
*/
qsort(mountpoints, used, sizeof (char *), mountpoint_compare);
/*
* Walk through and first unshare everything.
*/
for (i = 0; i < used; i++) {
zfs_share_proto_t *curr_proto;
for (curr_proto = share_all_proto; *curr_proto != PROTO_END;
curr_proto++) {
if (is_shared(hdl, mountpoints[i], *curr_proto) &&
unshare_one(hdl, mountpoints[i],
mountpoints[i], *curr_proto) != 0)
goto out;
}
}
/*
* Now unmount everything, removing the underlying directories as
* appropriate.
*/
for (i = 0; i < used; i++) {
if (unmount_one(hdl, mountpoints[i], flags) != 0)
goto out;
}
for (i = 0; i < used; i++) {
if (datasets[i])
remove_mountpoint(datasets[i]);
}
ret = 0;
out:
for (i = 0; i < used; i++) {
if (datasets[i])
zfs_close(datasets[i]);
free(mountpoints[i]);
}
free(datasets);
free(mountpoints);
return (ret);
}