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libzfs_mount.c
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/*
* 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 2015 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014, 2021 by Delphix. All rights reserved.
* Copyright 2016 Igor Kozhukhov <[email protected]>
* Copyright 2017 RackTop Systems.
* Copyright (c) 2018 Datto Inc.
* Copyright 2018 OmniOS Community Edition (OmniOSce) Association.
*/
/*
* 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_mount_at()
* 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_share_proto()
* zfs_shareall();
* zfs_unshare_nfs()
* zfs_unshare_smb()
* zfs_unshareall_nfs()
* zfs_unshareall_smb()
* zfs_unshareall()
* zfs_unshareall_bypath()
*
* 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 <fcntl.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 <sys/vfs.h>
#include <sys/dsl_crypt.h>
#include <libzfs.h>
#include "libzfs_impl.h"
#include <thread_pool.h>
#include <libshare.h>
#include <sys/systeminfo.h>
#define MAXISALEN 257 /* based on sysinfo(2) man page */
static int mount_tp_nthr = 512; /* tpool threads for multi-threaded mounting */
static void zfs_mount_task(void *);
static zfs_share_type_t zfs_is_shared_proto(zfs_handle_t *, char **,
zfs_share_proto_t);
/*
* The share protocols table must be in the same order as the zfs_share_proto_t
* enum in libzfs_impl.h
*/
proto_table_t proto_table[PROTO_END] = {
{ZFS_PROP_SHARENFS, "nfs", EZFS_SHARENFSFAILED, EZFS_UNSHARENFSFAILED},
{ZFS_PROP_SHARESMB, "smb", EZFS_SHARESMBFAILED, EZFS_UNSHARESMBFAILED},
};
static zfs_share_proto_t nfs_only[] = {
PROTO_NFS,
PROTO_END
};
static zfs_share_proto_t smb_only[] = {
PROTO_SMB,
PROTO_END
};
static zfs_share_proto_t share_all_proto[] = {
PROTO_NFS,
PROTO_SMB,
PROTO_END
};
static boolean_t
dir_is_empty_stat(const char *dirname)
{
struct stat st;
/*
* We only want to return false if the given path is a non empty
* directory, all other errors are handled elsewhere.
*/
if (stat(dirname, &st) < 0 || !S_ISDIR(st.st_mode)) {
return (B_TRUE);
}
/*
* An empty directory will still have two entries in it, one
* entry for each of "." and "..".
*/
if (st.st_size > 2) {
return (B_FALSE);
}
return (B_TRUE);
}
static boolean_t
dir_is_empty_readdir(const char *dirname)
{
DIR *dirp;
struct dirent64 *dp;
int dirfd;
if ((dirfd = openat(AT_FDCWD, dirname,
O_RDONLY | O_NDELAY | O_LARGEFILE | O_CLOEXEC, 0)) < 0) {
return (B_TRUE);
}
if ((dirp = fdopendir(dirfd)) == NULL) {
(void) close(dirfd);
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);
}
/*
* 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)
{
struct statfs64 st;
/*
* If the statvfs call fails or the filesystem is not a ZFS
* filesystem, fall back to the slow path which uses readdir.
*/
if ((statfs64(dirname, &st) != 0) ||
(st.f_type != ZFS_SUPER_MAGIC)) {
return (dir_is_empty_readdir(dirname));
}
/*
* At this point, we know the provided path is on a ZFS
* filesystem, so we can use stat instead of readdir to
* determine if the directory is empty or not. We try to avoid
* using readdir because that requires opening "dirname"; this
* open file descriptor can potentially end up in a child
* process if there's a concurrent fork, thus preventing the
* zfs_mount() from otherwise succeeding (the open file
* descriptor inherited by the child process will cause the
* parent's mount to fail with EBUSY). The performance
* implications of replacing the open, read, and close with a
* single stat is nice; but is not the main motivation for the
* added complexity.
*/
return (dir_is_empty_stat(dirname));
}
/*
* 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));
}
/*
* Checks any higher order concerns about whether the given dataset is
* mountable, false otherwise. zfs_is_mountable_internal specifically assumes
* that the caller has verified the sanity of mounting the dataset at
* mountpoint to the extent the caller wants.
*/
static boolean_t
zfs_is_mountable_internal(zfs_handle_t *zhp, const char *mountpoint)
{
if (zfs_prop_get_int(zhp, ZFS_PROP_ZONED) &&
getzoneid() == GLOBAL_ZONEID)
return (B_FALSE);
return (B_TRUE);
}
/*
* Returns true if the given dataset is mountable, false otherwise. Returns the
* mountpoint in 'buf'.
*/
boolean_t
zfs_is_mountable(zfs_handle_t *zhp, char *buf, size_t buflen,
zprop_source_t *source, int flags)
{
char sourceloc[MAXNAMELEN];
zprop_source_t sourcetype;
if (!zfs_prop_valid_for_type(ZFS_PROP_MOUNTPOINT, zhp->zfs_type,
B_FALSE))
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_is_mountable_internal(zhp, buf))
return (B_FALSE);
if (zfs_prop_get_int(zhp, ZFS_PROP_REDACTED) && !(flags & MS_FORCE))
return (B_FALSE);
if (source)
*source = sourcetype;
return (B_TRUE);
}
/*
* The filesystem is mounted by invoking the system mount utility rather
* than by the system call mount(2). This ensures that the /etc/mtab
* file is correctly locked for the update. Performing our own locking
* and /etc/mtab update requires making an unsafe assumption about how
* the mount utility performs its locking. Unfortunately, this also means
* in the case of a mount failure we do not have the exact errno. We must
* make due with return value from the mount process.
*
* In the long term a shared library called libmount is under development
* which provides a common API to address the locking and errno issues.
* Once the standard mount utility has been updated to use this library
* we can add an autoconf check to conditionally use it.
*
* http://www.kernel.org/pub/linux/utils/util-linux/libmount-docs/index.html
*/
static int
zfs_add_option(zfs_handle_t *zhp, char *options, int len,
zfs_prop_t prop, char *on, char *off)
{
char *source;
uint64_t value;
/* Skip adding duplicate default options */
if ((strstr(options, on) != NULL) || (strstr(options, off) != NULL))
return (0);
/*
* zfs_prop_get_int() is not used to ensure our mount options
* are not influenced by the current /proc/self/mounts contents.
*/
value = getprop_uint64(zhp, prop, &source);
(void) strlcat(options, ",", len);
(void) strlcat(options, value ? on : off, len);
return (0);
}
static int
zfs_add_options(zfs_handle_t *zhp, char *options, int len)
{
int error = 0;
error = zfs_add_option(zhp, options, len,
ZFS_PROP_ATIME, MNTOPT_ATIME, MNTOPT_NOATIME);
/*
* don't add relatime/strictatime when atime=off, otherwise strictatime
* will force atime=on
*/
if (strstr(options, MNTOPT_NOATIME) == NULL) {
error = zfs_add_option(zhp, options, len,
ZFS_PROP_RELATIME, MNTOPT_RELATIME, MNTOPT_STRICTATIME);
}
error = error ? error : zfs_add_option(zhp, options, len,
ZFS_PROP_DEVICES, MNTOPT_DEVICES, MNTOPT_NODEVICES);
error = error ? error : zfs_add_option(zhp, options, len,
ZFS_PROP_EXEC, MNTOPT_EXEC, MNTOPT_NOEXEC);
error = error ? error : zfs_add_option(zhp, options, len,
ZFS_PROP_READONLY, MNTOPT_RO, MNTOPT_RW);
error = error ? error : zfs_add_option(zhp, options, len,
ZFS_PROP_SETUID, MNTOPT_SETUID, MNTOPT_NOSETUID);
error = error ? error : zfs_add_option(zhp, options, len,
ZFS_PROP_NBMAND, MNTOPT_NBMAND, MNTOPT_NONBMAND);
return (error);
}
int
zfs_mount(zfs_handle_t *zhp, const char *options, int flags)
{
char mountpoint[ZFS_MAXPROPLEN];
if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL,
flags))
return (0);
return (zfs_mount_at(zhp, options, flags, mountpoint));
}
/*
* Mount the given filesystem.
*/
int
zfs_mount_at(zfs_handle_t *zhp, const char *options, int flags,
const char *mountpoint)
{
struct stat buf;
char mntopts[MNT_LINE_MAX];
char overlay[ZFS_MAXPROPLEN];
char prop_encroot[MAXNAMELEN];
boolean_t is_encroot;
zfs_handle_t *encroot_hp = zhp;
libzfs_handle_t *hdl = zhp->zfs_hdl;
uint64_t keystatus;
int remount = 0, rc;
if (options == NULL) {
(void) strlcpy(mntopts, MNTOPT_DEFAULTS, sizeof (mntopts));
} else {
(void) strlcpy(mntopts, options, sizeof (mntopts));
}
if (strstr(mntopts, MNTOPT_REMOUNT) != NULL)
remount = 1;
/* Potentially duplicates some checks if invoked by zfs_mount(). */
if (!zfs_is_mountable_internal(zhp, mountpoint))
return (0);
/*
* If the pool is imported read-only then all mounts must be read-only
*/
if (zpool_get_prop_int(zhp->zpool_hdl, ZPOOL_PROP_READONLY, NULL))
(void) strlcat(mntopts, "," MNTOPT_RO, sizeof (mntopts));
/*
* Append default mount options which apply to the mount point.
* This is done because under Linux (unlike Solaris) multiple mount
* points may reference a single super block. This means that just
* given a super block there is no back reference to update the per
* mount point options.
*/
rc = zfs_add_options(zhp, mntopts, sizeof (mntopts));
if (rc) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"default options unavailable"));
return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
mountpoint));
}
/*
* If the filesystem is encrypted the key must be loaded in order to
* mount. If the key isn't loaded, the MS_CRYPT flag decides whether
* or not we attempt to load the keys. Note: we must call
* zfs_refresh_properties() here since some callers of this function
* (most notably zpool_enable_datasets()) may implicitly load our key
* by loading the parent's key first.
*/
if (zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION) != ZIO_CRYPT_OFF) {
zfs_refresh_properties(zhp);
keystatus = zfs_prop_get_int(zhp, ZFS_PROP_KEYSTATUS);
/*
* If the key is unavailable and MS_CRYPT is set give the
* user a chance to enter the key. Otherwise just fail
* immediately.
*/
if (keystatus == ZFS_KEYSTATUS_UNAVAILABLE) {
if (flags & MS_CRYPT) {
rc = zfs_crypto_get_encryption_root(zhp,
&is_encroot, prop_encroot);
if (rc) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"Failed to get encryption root for "
"'%s'."), zfs_get_name(zhp));
return (rc);
}
if (!is_encroot) {
encroot_hp = zfs_open(hdl, prop_encroot,
ZFS_TYPE_DATASET);
if (encroot_hp == NULL)
return (hdl->libzfs_error);
}
rc = zfs_crypto_load_key(encroot_hp,
B_FALSE, NULL);
if (!is_encroot)
zfs_close(encroot_hp);
if (rc)
return (rc);
} else {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"encryption key not loaded"));
return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
mountpoint));
}
}
}
/*
* Append zfsutil option so the mount helper allow the mount
*/
strlcat(mntopts, "," MNTOPT_ZFSUTIL, sizeof (mntopts));
/* 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: %s"),
strerror(errno));
return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
mountpoint));
}
}
/*
* Overlay mounts are enabled by default but may be disabled
* via the 'overlay' property. The -O flag remains for compatibility.
*/
if (!(flags & MS_OVERLAY)) {
if (zfs_prop_get(zhp, ZFS_PROP_OVERLAY, overlay,
sizeof (overlay), NULL, NULL, 0, B_FALSE) == 0) {
if (strcmp(overlay, "on") == 0) {
flags |= MS_OVERLAY;
}
}
}
/*
* Determine if the mountpoint is empty. If so, refuse to perform the
* mount. We don't perform this check if 'remount' is
* specified or if overlay option (-O) is given
*/
if ((flags & MS_OVERLAY) == 0 && !remount &&
!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 */
rc = do_mount(zhp, mountpoint, mntopts, flags);
if (rc) {
/*
* 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 (rc == EBUSY) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"mountpoint or dataset is busy"));
} else if (rc == EPERM) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"Insufficient privileges"));
} else if (rc == ENOTSUP) {
int spa_version;
VERIFY(zfs_spa_version(zhp, &spa_version) == 0);
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"Can't mount a version %llu "
"file system on a version %d pool. Pool must be"
" upgraded to mount this file system."),
(u_longlong_t)zfs_prop_get_int(zhp,
ZFS_PROP_VERSION), spa_version);
} else {
zfs_error_aux(hdl, "%s", strerror(rc));
}
return (zfs_error_fmt(hdl, EZFS_MOUNTFAILED,
dgettext(TEXT_DOMAIN, "cannot mount '%s'"),
zhp->zfs_name));
}
/* remove the mounted entry before re-adding on remount */
if (remount)
libzfs_mnttab_remove(hdl, 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(zfs_handle_t *zhp, const char *mountpoint, int flags)
{
int error;
error = do_unmount(zhp, mountpoint, flags);
if (error != 0) {
int libzfs_err;
switch (error) {
case EBUSY:
libzfs_err = EZFS_BUSY;
break;
case EIO:
libzfs_err = EZFS_IO;
break;
case ENOENT:
libzfs_err = EZFS_NOENT;
break;
case ENOMEM:
libzfs_err = EZFS_NOMEM;
break;
case EPERM:
libzfs_err = EZFS_PERM;
break;
default:
libzfs_err = EZFS_UMOUNTFAILED;
}
if (zhp) {
return (zfs_error_fmt(zhp->zfs_hdl, libzfs_err,
dgettext(TEXT_DOMAIN, "cannot unmount '%s'"),
mountpoint));
} else {
return (-1);
}
}
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;
boolean_t encroot, unmounted = B_FALSE;
/* 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) {
free(mntpt);
return (-1);
}
zfs_commit_all_shares();
if (unmount_one(zhp, mntpt, flags) != 0) {
free(mntpt);
(void) zfs_shareall(zhp);
zfs_commit_all_shares();
return (-1);
}
libzfs_mnttab_remove(hdl, zhp->zfs_name);
free(mntpt);
unmounted = B_TRUE;
}
/*
* If the MS_CRYPT flag is provided we must ensure we attempt to
* unload the dataset's key regardless of whether we did any work
* to unmount it. We only do this for encryption roots.
*/
if ((flags & MS_CRYPT) != 0 &&
zfs_prop_get_int(zhp, ZFS_PROP_ENCRYPTION) != ZIO_CRYPT_OFF) {
zfs_refresh_properties(zhp);
if (zfs_crypto_get_encryption_root(zhp, &encroot, NULL) != 0 &&
unmounted) {
(void) zfs_mount(zhp, NULL, 0);
return (-1);
}
if (encroot && zfs_prop_get_int(zhp, ZFS_PROP_KEYSTATUS) ==
ZFS_KEYSTATUS_AVAILABLE &&
zfs_crypto_unload_key(zhp) != 0) {
(void) zfs_mount(zhp, NULL, 0);
return (-1);
}
}
zpool_disable_volume_os(zhp->zfs_name);
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,
CL_GATHER_ITER_MOUNTED, 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 (B_FALSE);
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);
}
/*
* Unshare a filesystem by mountpoint.
*/
int
unshare_one(libzfs_handle_t *hdl, const char *name, const char *mountpoint,
zfs_share_proto_t proto)
{
int err;
err = sa_disable_share(mountpoint, proto_table[proto].p_name);
if (err != SA_OK) {
return (zfs_error_fmt(hdl, proto_table[proto].p_unshare_err,
dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
name, sa_errorstr(err)));
}
return (0);
}
/*
* Query libshare for the given mountpoint and protocol, returning
* a zfs_share_type_t value.
*/
zfs_share_type_t
is_shared(const char *mountpoint, zfs_share_proto_t proto)
{
if (sa_is_shared(mountpoint, proto_table[proto].p_name)) {
switch (proto) {
case PROTO_NFS:
return (SHARED_NFS);
case PROTO_SMB:
return (SHARED_SMB);
default:
return (SHARED_NOT_SHARED);
}
}
return (SHARED_NOT_SHARED);
}
/*
* Share the given filesystem according to the options in the specified
* protocol specific properties (sharenfs, sharesmb). We rely
* on "libshare" to do the dirty work for us.
*/
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];
zfs_share_proto_t *curr_proto;
zprop_source_t sourcetype;
int err = 0;
if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL, 0))
return (0);
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;
err = sa_enable_share(zfs_get_name(zhp), mountpoint, shareopts,
proto_table[*curr_proto].p_name);
if (err != SA_OK) {
return (zfs_error_fmt(zhp->zfs_hdl,
proto_table[*curr_proto].p_share_err,
dgettext(TEXT_DOMAIN, "cannot share '%s: %s'"),
zfs_get_name(zhp), sa_errorstr(err)));
}
}
return (0);
}
int
zfs_share(zfs_handle_t *zhp)
{
assert(!ZFS_IS_VOLUME(zhp));
return (zfs_share_proto(zhp, share_all_proto));
}
int
zfs_unshare(zfs_handle_t *zhp)
{
assert(!ZFS_IS_VOLUME(zhp));
return (zfs_unshareall(zhp));
}
/*
* Check to see if the filesystem is currently shared.
*/
static 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(mountpoint, proto))
!= SHARED_NOT_SHARED) {
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);
}
/*
* 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)
{
return (sa_validate_shareopts(options, proto_table[proto].p_name));
}
void
zfs_commit_proto(zfs_share_proto_t *proto)
{
zfs_share_proto_t *curr_proto;
for (curr_proto = proto; *curr_proto != PROTO_END; curr_proto++) {
sa_commit_shares(proto_table[*curr_proto].p_name);
}
}
void
zfs_commit_nfs_shares(void)
{
zfs_commit_proto(nfs_only);
}
void
zfs_commit_smb_shares(void)
{
zfs_commit_proto(smb_only);
}
void
zfs_commit_all_shares(void)
{
zfs_commit_proto(share_all_proto);
}
void
zfs_commit_shares(const char *proto)
{
if (proto == NULL)
zfs_commit_proto(share_all_proto);
else if (strcmp(proto, "nfs") == 0)
zfs_commit_proto(nfs_only);
else if (strcmp(proto, "smb") == 0)
zfs_commit_proto(smb_only);
}
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 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 */
if (mountpoint != NULL)
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(mntpt, *curr_proto)) {
if (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.
*/
static 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);