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-rw-r--r--cddl/contrib/opensolaris/lib/libzfs/common/libzfs_mount.c1734
1 files changed, 0 insertions, 1734 deletions
diff --git a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_mount.c b/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_mount.c
deleted file mode 100644
index 9d4948cc7173..000000000000
--- a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_mount.c
+++ /dev/null
@@ -1,1734 +0,0 @@
-/*
- * 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, 2016 by Delphix. All rights reserved.
- * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
- * Copyright 2017 Joyent, Inc.
- * Copyright 2017 RackTop Systems.
- * 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_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/statvfs.h>
-
-#include <libzfs.h>
-
-#include "libzfs_impl.h"
-#include <thread_pool.h>
-
-#include <libshare.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 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);
-
-/*
- * The share protocols table must be in the same order as the zfs_share_proto_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
-};
-
-/*
- * 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) {
-#ifdef illumos
- /*
- * 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);
- }
- }
-#else
- if (proto == PROTO_NFS)
- return (SHARED_NFS);
-#endif
- }
- }
-
- return (SHARED_NOT_SHARED);
-}
-
-#ifdef illumos
-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 statvfs64 st;
-
- /*
- * If the statvfs call fails or the filesystem is not a ZFS
- * filesystem, fall back to the slow path which uses readdir.
- */
- if ((statvfs64(dirname, &st) != 0) ||
- (strcmp(st.f_basetype, "zfs") != 0)) {
- 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));
-}
-#endif
-
-/*
- * 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));
-}
-
-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'.
- */
-static boolean_t
-zfs_is_mountable(zfs_handle_t *zhp, char *buf, size_t buflen,
- zprop_source_t *source)
-{
- char sourceloc[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_is_mountable_internal(zhp, buf))
- 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)
-{
- char mountpoint[ZFS_MAXPROPLEN];
-
- if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL))
- return (0);
-
- return (zfs_mount_at(zhp, options, flags, mountpoint));
-}
-
-int
-zfs_mount_at(zfs_handle_t *zhp, const char *options, int flags,
- const char *mountpoint)
-{
- struct stat buf;
- 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 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))
- flags |= MS_RDONLY;
-
- if (!zfs_is_mountable_internal(zhp, mountpoint))
- return (B_FALSE);
-
- /* 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));
- }
- }
-
-#ifdef illumos /* FreeBSD: overlay mounts are not checked. */
- /*
- * 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));
- }
-#endif
-
- /* perform the mount */
- if (zmount(zfs_get_name(zhp), mountpoint, 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];
- int spa_version;
-
- VERIFY(zfs_spa_version(zhp, &spa_version) == 0);
- (void) snprintf(buf, sizeof (buf),
- dgettext(TEXT_DOMAIN, "Can't mount a version %lld "
- "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);
- 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 (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);
-}
-
-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.
- */
-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))
- != 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);
-}
-
-/*
- * 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.
- */
-
-#ifdef illumos
-static sa_handle_t (*_sa_init)(int);
-static sa_handle_t (*_sa_init_arg)(int, void *);
-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);
-#endif
-
-/*
- * _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)
-{
-#ifdef illumos
- 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_init_arg = (sa_handle_t (*)(int, void *))dlsym(libshare,
- "sa_init_arg");
- _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_init_arg == 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_init_arg = 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;
- }
- }
-#endif
-}
-
-/*
- * 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.
- */
-static int
-zfs_init_libshare_impl(libzfs_handle_t *zhandle, int service, void *arg)
-{
-#ifdef illumos
- /*
- * libshare is either not installed or we're in a branded zone. The
- * rest of the wrapper functions around the libshare calls already
- * handle NULL function pointers, but we don't want the callers of
- * zfs_init_libshare() to fail prematurely if libshare is not available.
- */
- if (_sa_init == NULL)
- return (SA_OK);
-
- /*
- * Attempt to refresh libshare. This is necessary if there was a cache
- * miss for a new ZFS dataset that was just created, or if state of the
- * sharetab file has changed since libshare was last initialized. 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.
- */
- if (_sa_needs_refresh != NULL &&
- _sa_needs_refresh(zhandle->libzfs_sharehdl)) {
- zfs_uninit_libshare(zhandle);
- zhandle->libzfs_sharehdl = _sa_init_arg(service, arg);
- }
-
- if (zhandle && zhandle->libzfs_sharehdl == NULL)
- zhandle->libzfs_sharehdl = _sa_init_arg(service, arg);
-
- if (zhandle->libzfs_sharehdl == NULL)
- return (SA_NO_MEMORY);
-#endif
-
- return (SA_OK);
-}
-int
-zfs_init_libshare(libzfs_handle_t *zhandle, int service)
-{
- return (zfs_init_libshare_impl(zhandle, service, NULL));
-}
-
-int
-zfs_init_libshare_arg(libzfs_handle_t *zhandle, int service, void *arg)
-{
- return (zfs_init_libshare_impl(zhandle, service, arg));
-}
-
-
-/*
- * 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) {
-#ifdef illumos
- if (_sa_fini != NULL)
- _sa_fini(zhandle->libzfs_sharehdl);
-#endif
- 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)
-{
-#ifdef illumos
- if (_sa_parse_legacy_options != NULL) {
- return (_sa_parse_legacy_options(NULL, options,
- proto_table[proto].p_name));
- }
- return (SA_CONFIG_ERR);
-#else
- return (SA_OK);
-#endif
-}
-
-#ifdef illumos
-/*
- * 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);
-}
-#endif /* illumos */
-
-/*
- * 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;
- zfs_share_proto_t *curr_proto;
- zprop_source_t sourcetype;
- int error, ret;
-
- if (!zfs_is_mountable(zhp, mountpoint, sizeof (mountpoint), NULL))
- 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;
-#ifdef illumos
- ret = zfs_init_libshare_arg(hdl, SA_INIT_ONE_SHARE_FROM_HANDLE,
- zhp);
- if (ret != 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);
- }
-#endif
-
- /*
- * 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;
-
-#ifdef illumos
- 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);
- }
- 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
-#else
- if (*curr_proto != PROTO_NFS) {
- fprintf(stderr, "Unsupported share protocol: %d.\n",
- *curr_proto);
- continue;
- }
-
- if (strcmp(shareopts, "on") == 0)
- error = fsshare(ZFS_EXPORTS_PATH, mountpoint, "");
- else
- error = fsshare(ZFS_EXPORTS_PATH, mountpoint, shareopts);
- if (error != 0)
-#endif
- {
- (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)
-{
-#ifdef illumos
- 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, initialize everything because we
- * don't know what other unsharing may happen later. Functions up the
- * stack are allowed to initialize instead a subset of shares at the
- * time the set is known.
- */
- if ((err = zfs_init_libshare_arg(hdl, SA_INIT_ONE_SHARE_FROM_NAME,
- (void *)name)) != SA_OK) {
- free(mntpt); /* don't need the copy anymore */
- return (zfs_error_fmt(hdl, proto_table[proto].p_unshare_err,
- 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,
- proto_table[proto].p_unshare_err,
- dgettext(TEXT_DOMAIN, "cannot unshare '%s': %s"),
- name, _sa_errorstr(err)));
- }
- } else {
- return (zfs_error_fmt(hdl, proto_table[proto].p_unshare_err,
- dgettext(TEXT_DOMAIN, "cannot unshare '%s': not found"),
- name));
- }
-#else
- char buf[MAXPATHLEN];
- FILE *fp;
- int err;
-
- if (proto != PROTO_NFS) {
- fprintf(stderr, "No SMB support in FreeBSD yet.\n");
- return (EOPNOTSUPP);
- }
-
- err = fsunshare(ZFS_EXPORTS_PATH, mountpoint);
- if (err != 0) {
- zfs_error_aux(hdl, "%s", strerror(err));
- return (zfs_error_fmt(hdl, EZFS_UNSHARENFSFAILED,
- dgettext(TEXT_DOMAIN,
- "cannot unshare '%s'"), name));
- }
-#endif
- 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);
- }
-}
-
-/*
- * Add the given zfs handle to the cb_handles array, dynamically reallocating
- * the array if it is out of space
- */
-void
-libzfs_add_handle(get_all_cb_t *cbp, zfs_handle_t *zhp)
-{
- if (cbp->cb_alloc == cbp->cb_used) {
- size_t newsz;
- zfs_handle_t **newhandles;
-
- newsz = cbp->cb_alloc != 0 ? cbp->cb_alloc * 2 : 64;
- newhandles = zfs_realloc(zhp->zfs_hdl,
- cbp->cb_handles, cbp->cb_alloc * sizeof (zfs_handle_t *),
- newsz * sizeof (zfs_handle_t *));
- cbp->cb_handles = newhandles;
- cbp->cb_alloc = newsz;
- }
- cbp->cb_handles[cbp->cb_used++] = zhp;
-}
-
-/*
- * Recursive helper function used during file system enumeration
- */
-static int
-zfs_iter_cb(zfs_handle_t *zhp, void *data)
-{
- get_all_cb_t *cbp = data;
-
- if (!(zfs_get_type(zhp) & ZFS_TYPE_FILESYSTEM)) {
- zfs_close(zhp);
- return (0);
- }
-
- if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_NOAUTO) {
- zfs_close(zhp);
- return (0);
- }
-
- /*
- * If this filesystem is inconsistent and has a receive resume
- * token, we can not mount it.
- */
- if (zfs_prop_get_int(zhp, ZFS_PROP_INCONSISTENT) &&
- zfs_prop_get(zhp, ZFS_PROP_RECEIVE_RESUME_TOKEN,
- NULL, 0, NULL, NULL, 0, B_TRUE) == 0) {
- zfs_close(zhp);
- return (0);
- }
-
- libzfs_add_handle(cbp, zhp);
- if (zfs_iter_filesystems(zhp, zfs_iter_cb, cbp) != 0) {
- zfs_close(zhp);
- return (-1);
- }
- return (0);
-}
-
-/*
- * Sort comparator that compares two mountpoint paths. We sort these paths so
- * that subdirectories immediately follow their parents. This means that we
- * effectively treat the '/' character as the lowest value non-nul char.
- * Since filesystems from non-global zones can have the same mountpoint
- * as other filesystems, the comparator sorts global zone filesystems to
- * the top of the list. This means that the global zone will traverse the
- * filesystem list in the correct order and can stop when it sees the
- * first zoned filesystem. In a non-global zone, only the delegated
- * filesystems are seen.
- *
- * An example sorted list using this comparator would look like:
- *
- * /foo
- * /foo/bar
- * /foo/bar/baz
- * /foo/baz
- * /foo.bar
- * /foo (NGZ1)
- * /foo (NGZ2)
- *
- * The mount code depend on this ordering to deterministically iterate
- * over filesystems in order to spawn parallel mount tasks.
- */
-static int
-mountpoint_cmp(const void *arga, const void *argb)
-{
- zfs_handle_t *const *zap = arga;
- zfs_handle_t *za = *zap;
- zfs_handle_t *const *zbp = argb;
- zfs_handle_t *zb = *zbp;
- char mounta[MAXPATHLEN];
- char mountb[MAXPATHLEN];
- const char *a = mounta;
- const char *b = mountb;
- boolean_t gota, gotb;
- uint64_t zoneda, zonedb;
-
- zoneda = zfs_prop_get_int(za, ZFS_PROP_ZONED);
- zonedb = zfs_prop_get_int(zb, ZFS_PROP_ZONED);
- if (zoneda && !zonedb)
- return (1);
- if (!zoneda && zonedb)
- return (-1);
- gota = (zfs_get_type(za) == ZFS_TYPE_FILESYSTEM);
- if (gota)
- verify(zfs_prop_get(za, ZFS_PROP_MOUNTPOINT, mounta,
- sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0);
- gotb = (zfs_get_type(zb) == ZFS_TYPE_FILESYSTEM);
- if (gotb)
- verify(zfs_prop_get(zb, ZFS_PROP_MOUNTPOINT, mountb,
- sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0);
-
- if (gota && gotb) {
- while (*a != '\0' && (*a == *b)) {
- a++;
- b++;
- }
- if (*a == *b)
- return (0);
- if (*a == '\0')
- return (-1);
- if (*b == '\0')
- return (1);
- if (*a == '/')
- return (-1);
- if (*b == '/')
- return (1);
- return (*a < *b ? -1 : *a > *b);
- }
-
- if (gota)
- return (-1);
- if (gotb)
- return (1);
-
- /*
- * If neither filesystem has a mountpoint, revert to sorting by
- * datset name.
- */
- return (strcmp(zfs_get_name(za), zfs_get_name(zb)));
-}
-
-/*
- * Return true if path2 is a child of path1 or path2 equals path1 or
- * path1 is "/" (path2 is always a child of "/").
- */
-static boolean_t
-libzfs_path_contains(const char *path1, const char *path2)
-{
- return (strcmp(path1, path2) == 0 || strcmp(path1, "/") == 0 ||
- (strstr(path2, path1) == path2 && path2[strlen(path1)] == '/'));
-}
-
-
-static int
-non_descendant_idx(zfs_handle_t **handles, size_t num_handles, int idx)
-{
- char parent[ZFS_MAXPROPLEN];
- char child[ZFS_MAXPROPLEN];
- int i;
-
- verify(zfs_prop_get(handles[idx], ZFS_PROP_MOUNTPOINT, parent,
- sizeof (parent), NULL, NULL, 0, B_FALSE) == 0);
-
- for (i = idx + 1; i < num_handles; i++) {
- verify(zfs_prop_get(handles[i], ZFS_PROP_MOUNTPOINT, child,
- sizeof (child), NULL, NULL, 0, B_FALSE) == 0);
- if (!libzfs_path_contains(parent, child))
- break;
- }
- return (i);
-}
-
-typedef struct mnt_param {
- libzfs_handle_t *mnt_hdl;
- tpool_t *mnt_tp;
- zfs_handle_t **mnt_zhps; /* filesystems to mount */
- size_t mnt_num_handles;
- int mnt_idx; /* Index of selected entry to mount */
- zfs_iter_f mnt_func;
- void *mnt_data;
-} mnt_param_t;
-
-/*
- * Allocate and populate the parameter struct for mount function, and
- * schedule mounting of the entry selected by idx.
- */
-static void
-zfs_dispatch_mount(libzfs_handle_t *hdl, zfs_handle_t **handles,
- size_t num_handles, int idx, zfs_iter_f func, void *data, tpool_t *tp)
-{
- mnt_param_t *mnt_param = zfs_alloc(hdl, sizeof (mnt_param_t));
-
- mnt_param->mnt_hdl = hdl;
- mnt_param->mnt_tp = tp;
- mnt_param->mnt_zhps = handles;
- mnt_param->mnt_num_handles = num_handles;
- mnt_param->mnt_idx = idx;
- mnt_param->mnt_func = func;
- mnt_param->mnt_data = data;
-
- (void) tpool_dispatch(tp, zfs_mount_task, (void*)mnt_param);
-}
-
-/*
- * This is the structure used to keep state of mounting or sharing operations
- * during a call to zpool_enable_datasets().
- */
-typedef struct mount_state {
- /*
- * ms_mntstatus is set to -1 if any mount fails. While multiple threads
- * could update this variable concurrently, no synchronization is
- * needed as it's only ever set to -1.
- */
- int ms_mntstatus;
- int ms_mntflags;
- const char *ms_mntopts;
-} mount_state_t;
-
-static int
-zfs_mount_one(zfs_handle_t *zhp, void *arg)
-{
- mount_state_t *ms = arg;
- int ret = 0;
-
- if (zfs_mount(zhp, ms->ms_mntopts, ms->ms_mntflags) != 0)
- ret = ms->ms_mntstatus = -1;
- return (ret);
-}
-
-static int
-zfs_share_one(zfs_handle_t *zhp, void *arg)
-{
- mount_state_t *ms = arg;
- int ret = 0;
-
- if (zfs_share(zhp) != 0)
- ret = ms->ms_mntstatus = -1;
- return (ret);
-}
-
-/*
- * Thread pool function to mount one file system. On completion, it finds and
- * schedules its children to be mounted. This depends on the sorting done in
- * zfs_foreach_mountpoint(). Note that the degenerate case (chain of entries
- * each descending from the previous) will have no parallelism since we always
- * have to wait for the parent to finish mounting before we can schedule
- * its children.
- */
-static void
-zfs_mount_task(void *arg)
-{
- mnt_param_t *mp = arg;
- int idx = mp->mnt_idx;
- zfs_handle_t **handles = mp->mnt_zhps;
- size_t num_handles = mp->mnt_num_handles;
- char mountpoint[ZFS_MAXPROPLEN];
-
- verify(zfs_prop_get(handles[idx], ZFS_PROP_MOUNTPOINT, mountpoint,
- sizeof (mountpoint), NULL, NULL, 0, B_FALSE) == 0);
-
- if (mp->mnt_func(handles[idx], mp->mnt_data) != 0)
- return;
-
- /*
- * We dispatch tasks to mount filesystems with mountpoints underneath
- * this one. We do this by dispatching the next filesystem with a
- * descendant mountpoint of the one we just mounted, then skip all of
- * its descendants, dispatch the next descendant mountpoint, and so on.
- * The non_descendant_idx() function skips over filesystems that are
- * descendants of the filesystem we just dispatched.
- */
- for (int i = idx + 1; i < num_handles;
- i = non_descendant_idx(handles, num_handles, i)) {
- char child[ZFS_MAXPROPLEN];
- verify(zfs_prop_get(handles[i], ZFS_PROP_MOUNTPOINT,
- child, sizeof (child), NULL, NULL, 0, B_FALSE) == 0);
-
- if (!libzfs_path_contains(mountpoint, child))
- break; /* not a descendant, return */
- zfs_dispatch_mount(mp->mnt_hdl, handles, num_handles, i,
- mp->mnt_func, mp->mnt_data, mp->mnt_tp);
- }
- free(mp);
-}
-
-/*
- * Issue the func callback for each ZFS handle contained in the handles
- * array. This function is used to mount all datasets, and so this function
- * guarantees that filesystems for parent mountpoints are called before their
- * children. As such, before issuing any callbacks, we first sort the array
- * of handles by mountpoint.
- *
- * Callbacks are issued in one of two ways:
- *
- * 1. Sequentially: If the parallel argument is B_FALSE or the ZFS_SERIAL_MOUNT
- * environment variable is set, then we issue callbacks sequentially.
- *
- * 2. In parallel: If the parallel argument is B_TRUE and the ZFS_SERIAL_MOUNT
- * environment variable is not set, then we use a tpool to dispatch threads
- * to mount filesystems in parallel. This function dispatches tasks to mount
- * the filesystems at the top-level mountpoints, and these tasks in turn
- * are responsible for recursively mounting filesystems in their children
- * mountpoints.
- */
-void
-zfs_foreach_mountpoint(libzfs_handle_t *hdl, zfs_handle_t **handles,
- size_t num_handles, zfs_iter_f func, void *data, boolean_t parallel)
-{
- zoneid_t zoneid = getzoneid();
-
- /*
- * The ZFS_SERIAL_MOUNT environment variable is an undocumented
- * variable that can be used as a convenience to do a/b comparison
- * of serial vs. parallel mounting.
- */
- boolean_t serial_mount = !parallel ||
- (getenv("ZFS_SERIAL_MOUNT") != NULL);
-
- /*
- * Sort the datasets by mountpoint. See mountpoint_cmp for details
- * of how these are sorted.
- */
- qsort(handles, num_handles, sizeof (zfs_handle_t *), mountpoint_cmp);
-
- if (serial_mount) {
- for (int i = 0; i < num_handles; i++) {
- func(handles[i], data);
- }
- return;
- }
-
- /*
- * Issue the callback function for each dataset using a parallel
- * algorithm that uses a thread pool to manage threads.
- */
- tpool_t *tp = tpool_create(1, mount_tp_nthr, 0, NULL);
-
- /*
- * There may be multiple "top level" mountpoints outside of the pool's
- * root mountpoint, e.g.: /foo /bar. Dispatch a mount task for each of
- * these.
- */
- for (int i = 0; i < num_handles;
- i = non_descendant_idx(handles, num_handles, i)) {
- /*
- * Since the mountpoints have been sorted so that the zoned
- * filesystems are at the end, a zoned filesystem seen from
- * the global zone means that we're done.
- */
- if (zoneid == GLOBAL_ZONEID &&
- zfs_prop_get_int(handles[i], ZFS_PROP_ZONED))
- break;
- zfs_dispatch_mount(hdl, handles, num_handles, i, func, data,
- tp);
- }
-
- tpool_wait(tp); /* wait for all scheduled mounts to complete */
- tpool_destroy(tp);
-}
-
-/*
- * Mount and share all datasets within the given pool. This assumes that no
- * datasets within the pool are currently mounted.
- */
-#pragma weak zpool_mount_datasets = zpool_enable_datasets
-int
-zpool_enable_datasets(zpool_handle_t *zhp, const char *mntopts, int flags)
-{
- get_all_cb_t cb = { 0 };
- mount_state_t ms = { 0 };
- zfs_handle_t *zfsp;
- int ret = 0;
-
- if ((zfsp = zfs_open(zhp->zpool_hdl, zhp->zpool_name,
- ZFS_TYPE_DATASET)) == NULL)
- goto out;
-
- /*
- * Gather all non-snapshot datasets within the pool. Start by adding
- * the root filesystem for this pool to the list, and then iterate
- * over all child filesystems.
- */
- libzfs_add_handle(&cb, zfsp);
- if (zfs_iter_filesystems(zfsp, zfs_iter_cb, &cb) != 0)
- goto out;
-
- /*
- * Mount all filesystems
- */
- ms.ms_mntopts = mntopts;
- ms.ms_mntflags = flags;
- zfs_foreach_mountpoint(zhp->zpool_hdl, cb.cb_handles, cb.cb_used,
- zfs_mount_one, &ms, B_TRUE);
- if (ms.ms_mntstatus != 0)
- ret = ms.ms_mntstatus;
-
- /*
- * Share all filesystems that need to be shared. This needs to be
- * a separate pass because libshare is not mt-safe, and so we need
- * to share serially.
- */
- ms.ms_mntstatus = 0;
- zfs_foreach_mountpoint(zhp->zpool_hdl, cb.cb_handles, cb.cb_used,
- zfs_share_one, &ms, B_FALSE);
- if (ms.ms_mntstatus != 0)
- ret = ms.ms_mntstatus;
-
-out:
- for (int i = 0; i < cb.cb_used; i++)
- zfs_close(cb.cb_handles[i]);
- free(cb.cb_handles);
-
- return (ret);
-}
-
-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 **datasets = NULL;
- libzfs_handle_t *hdl = zhp->zpool_hdl;
- int i;
- int ret = -1;
- int flags = (force ? MS_FORCE : 0);
-#ifdef illumos
- sa_init_selective_arg_t sharearg;
-#endif
-
- 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.
- */
-#ifdef illumos
- sharearg.zhandle_arr = datasets;
- sharearg.zhandle_len = used;
- ret = zfs_init_libshare_arg(hdl, SA_INIT_SHARE_API_SELECTIVE,
- &sharearg);
- if (ret != 0)
- goto out;
-#endif
- 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);
-}