diff options
Diffstat (limited to 'cddl/contrib/opensolaris/lib/libzfs/common/libzfs_changelist.c')
| -rw-r--r-- | cddl/contrib/opensolaris/lib/libzfs/common/libzfs_changelist.c | 736 |
1 files changed, 0 insertions, 736 deletions
diff --git a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_changelist.c b/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_changelist.c deleted file mode 100644 index 7bbb68328f29b..0000000000000 --- a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_changelist.c +++ /dev/null @@ -1,736 +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 2010 Sun Microsystems, Inc. All rights reserved. - * Use is subject to license terms. - * - * Portions Copyright 2007 Ramprakash Jelari - * Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>. - * All rights reserved. - * Copyright (c) 2014, 2016 by Delphix. All rights reserved. - * Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com> - */ - -#include <libintl.h> -#include <libuutil.h> -#include <stddef.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <zone.h> - -#include <libzfs.h> - -#include "libzfs_impl.h" - -/* - * Structure to keep track of dataset state. Before changing the 'sharenfs' or - * 'mountpoint' property, we record whether the filesystem was previously - * mounted/shared. This prior state dictates whether we remount/reshare the - * dataset after the property has been changed. - * - * The interface consists of the following sequence of functions: - * - * changelist_gather() - * changelist_prefix() - * < change property > - * changelist_postfix() - * changelist_free() - * - * Other interfaces: - * - * changelist_remove() - remove a node from a gathered list - * changelist_rename() - renames all datasets appropriately when doing a rename - * changelist_unshare() - unshares all the nodes in a given changelist - * changelist_haszonedchild() - check if there is any child exported to - * a local zone - */ -typedef struct prop_changenode { - zfs_handle_t *cn_handle; - int cn_shared; - int cn_mounted; - int cn_zoned; - boolean_t cn_needpost; /* is postfix() needed? */ - uu_list_node_t cn_listnode; -} prop_changenode_t; - -struct prop_changelist { - zfs_prop_t cl_prop; - zfs_prop_t cl_realprop; - zfs_prop_t cl_shareprop; /* used with sharenfs/sharesmb */ - uu_list_pool_t *cl_pool; - uu_list_t *cl_list; - boolean_t cl_waslegacy; - boolean_t cl_allchildren; - boolean_t cl_alldependents; - int cl_mflags; /* Mount flags */ - int cl_gflags; /* Gather request flags */ - boolean_t cl_haszonedchild; - boolean_t cl_sorted; -}; - -/* - * If the property is 'mountpoint', go through and unmount filesystems as - * necessary. We don't do the same for 'sharenfs', because we can just re-share - * with different options without interrupting service. We do handle 'sharesmb' - * since there may be old resource names that need to be removed. - */ -int -changelist_prefix(prop_changelist_t *clp) -{ - prop_changenode_t *cn; - int ret = 0; - - if (clp->cl_prop != ZFS_PROP_MOUNTPOINT && - clp->cl_prop != ZFS_PROP_SHARESMB) - return (0); - - for (cn = uu_list_first(clp->cl_list); cn != NULL; - cn = uu_list_next(clp->cl_list, cn)) { - - /* if a previous loop failed, set the remaining to false */ - if (ret == -1) { - cn->cn_needpost = B_FALSE; - continue; - } - - /* - * If we are in the global zone, but this dataset is exported - * to a local zone, do nothing. - */ - if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned) - continue; - - if (!ZFS_IS_VOLUME(cn->cn_handle)) { - /* - * Do the property specific processing. - */ - switch (clp->cl_prop) { - case ZFS_PROP_MOUNTPOINT: - if (clp->cl_gflags & CL_GATHER_DONT_UNMOUNT) - break; - if (zfs_unmount(cn->cn_handle, NULL, - clp->cl_mflags) != 0) { - ret = -1; - cn->cn_needpost = B_FALSE; - } - break; - case ZFS_PROP_SHARESMB: - (void) zfs_unshare_smb(cn->cn_handle, NULL); - break; - - default: - break; - } - } - } - - if (ret == -1) - (void) changelist_postfix(clp); - - return (ret); -} - -/* - * If the property is 'mountpoint' or 'sharenfs', go through and remount and/or - * reshare the filesystems as necessary. In changelist_gather() we recorded - * whether the filesystem was previously shared or mounted. The action we take - * depends on the previous state, and whether the value was previously 'legacy'. - * For non-legacy properties, we only remount/reshare the filesystem if it was - * previously mounted/shared. Otherwise, we always remount/reshare the - * filesystem. - */ -int -changelist_postfix(prop_changelist_t *clp) -{ - prop_changenode_t *cn; - char shareopts[ZFS_MAXPROPLEN]; - int errors = 0; - libzfs_handle_t *hdl; -#ifdef illumos - size_t num_datasets = 0, i; - zfs_handle_t **zhandle_arr; - sa_init_selective_arg_t sharearg; -#endif - - /* - * If we're changing the mountpoint, attempt to destroy the underlying - * mountpoint. All other datasets will have inherited from this dataset - * (in which case their mountpoints exist in the filesystem in the new - * location), or have explicit mountpoints set (in which case they won't - * be in the changelist). - */ - if ((cn = uu_list_last(clp->cl_list)) == NULL) - return (0); - - if (clp->cl_prop == ZFS_PROP_MOUNTPOINT && - !(clp->cl_gflags & CL_GATHER_DONT_UNMOUNT)) { - remove_mountpoint(cn->cn_handle); - } - - /* - * It is possible that the changelist_prefix() used libshare - * to unshare some entries. Since libshare caches data, an - * attempt to reshare during postfix can fail unless libshare - * is uninitialized here so that it will reinitialize later. - */ - if (cn->cn_handle != NULL) { - hdl = cn->cn_handle->zfs_hdl; - assert(hdl != NULL); - zfs_uninit_libshare(hdl); - -#ifdef illumos - /* - * For efficiencies sake, we initialize libshare for only a few - * shares (the ones affected here). Future initializations in - * this process should just use the cached initialization. - */ - for (cn = uu_list_last(clp->cl_list); cn != NULL; - cn = uu_list_prev(clp->cl_list, cn)) { - num_datasets++; - } - - zhandle_arr = zfs_alloc(hdl, - num_datasets * sizeof (zfs_handle_t *)); - for (i = 0, cn = uu_list_last(clp->cl_list); cn != NULL; - cn = uu_list_prev(clp->cl_list, cn)) { - zhandle_arr[i++] = cn->cn_handle; - zfs_refresh_properties(cn->cn_handle); - } - assert(i == num_datasets); - sharearg.zhandle_arr = zhandle_arr; - sharearg.zhandle_len = num_datasets; - errors = zfs_init_libshare_arg(hdl, SA_INIT_SHARE_API_SELECTIVE, - &sharearg); - free(zhandle_arr); -#endif - } - /* - * We walk the datasets in reverse, because we want to mount any parent - * datasets before mounting the children. We walk all datasets even if - * there are errors. - */ - for (cn = uu_list_last(clp->cl_list); cn != NULL; - cn = uu_list_prev(clp->cl_list, cn)) { - - boolean_t sharenfs; - boolean_t sharesmb; - boolean_t mounted; - - /* - * If we are in the global zone, but this dataset is exported - * to a local zone, do nothing. - */ - if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned) - continue; - - /* Only do post-processing if it's required */ - if (!cn->cn_needpost) - continue; - cn->cn_needpost = B_FALSE; - -#ifndef illumos - zfs_refresh_properties(cn->cn_handle); -#endif - - if (ZFS_IS_VOLUME(cn->cn_handle)) - continue; - - /* - * Remount if previously mounted or mountpoint was legacy, - * or sharenfs or sharesmb property is set. - */ - sharenfs = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARENFS, - shareopts, sizeof (shareopts), NULL, NULL, 0, - B_FALSE) == 0) && (strcmp(shareopts, "off") != 0)); - - sharesmb = ((zfs_prop_get(cn->cn_handle, ZFS_PROP_SHARESMB, - shareopts, sizeof (shareopts), NULL, NULL, 0, - B_FALSE) == 0) && (strcmp(shareopts, "off") != 0)); - - mounted = (clp->cl_gflags & CL_GATHER_DONT_UNMOUNT) || - zfs_is_mounted(cn->cn_handle, NULL); - - if (!mounted && (cn->cn_mounted || - ((sharenfs || sharesmb || clp->cl_waslegacy) && - (zfs_prop_get_int(cn->cn_handle, - ZFS_PROP_CANMOUNT) == ZFS_CANMOUNT_ON)))) { - - if (zfs_mount(cn->cn_handle, NULL, 0) != 0) - errors++; - else - mounted = TRUE; - } - - /* - * If the file system is mounted we always re-share even - * if the filesystem is currently shared, so that we can - * adopt any new options. - */ - if (sharenfs && mounted) - errors += zfs_share_nfs(cn->cn_handle); - else if (cn->cn_shared || clp->cl_waslegacy) - errors += zfs_unshare_nfs(cn->cn_handle, NULL); - if (sharesmb && mounted) - errors += zfs_share_smb(cn->cn_handle); - else if (cn->cn_shared || clp->cl_waslegacy) - errors += zfs_unshare_smb(cn->cn_handle, NULL); - } - - return (errors ? -1 : 0); -} - -/* - * Is this "dataset" a child of "parent"? - */ -boolean_t -isa_child_of(const char *dataset, const char *parent) -{ - int len; - - len = strlen(parent); - - if (strncmp(dataset, parent, len) == 0 && - (dataset[len] == '@' || dataset[len] == '/' || - dataset[len] == '\0')) - return (B_TRUE); - else - return (B_FALSE); - -} - -/* - * If we rename a filesystem, child filesystem handles are no longer valid - * since we identify each dataset by its name in the ZFS namespace. As a - * result, we have to go through and fix up all the names appropriately. We - * could do this automatically if libzfs kept track of all open handles, but - * this is a lot less work. - */ -void -changelist_rename(prop_changelist_t *clp, const char *src, const char *dst) -{ - prop_changenode_t *cn; - char newname[ZFS_MAX_DATASET_NAME_LEN]; - - for (cn = uu_list_first(clp->cl_list); cn != NULL; - cn = uu_list_next(clp->cl_list, cn)) { - /* - * Do not rename a clone that's not in the source hierarchy. - */ - if (!isa_child_of(cn->cn_handle->zfs_name, src)) - continue; - - /* - * Destroy the previous mountpoint if needed. - */ - remove_mountpoint(cn->cn_handle); - - (void) strlcpy(newname, dst, sizeof (newname)); - (void) strcat(newname, cn->cn_handle->zfs_name + strlen(src)); - - (void) strlcpy(cn->cn_handle->zfs_name, newname, - sizeof (cn->cn_handle->zfs_name)); - } -} - -/* - * Given a gathered changelist for the 'sharenfs' or 'sharesmb' property, - * unshare all the datasets in the list. - */ -int -changelist_unshare(prop_changelist_t *clp, zfs_share_proto_t *proto) -{ - prop_changenode_t *cn; - int ret = 0; - - if (clp->cl_prop != ZFS_PROP_SHARENFS && - clp->cl_prop != ZFS_PROP_SHARESMB) - return (0); - - for (cn = uu_list_first(clp->cl_list); cn != NULL; - cn = uu_list_next(clp->cl_list, cn)) { - if (zfs_unshare_proto(cn->cn_handle, NULL, proto) != 0) - ret = -1; - } - - return (ret); -} - -/* - * Check if there is any child exported to a local zone in a given changelist. - * This information has already been recorded while gathering the changelist - * via changelist_gather(). - */ -int -changelist_haszonedchild(prop_changelist_t *clp) -{ - return (clp->cl_haszonedchild); -} - -/* - * Remove a node from a gathered list. - */ -void -changelist_remove(prop_changelist_t *clp, const char *name) -{ - prop_changenode_t *cn; - - for (cn = uu_list_first(clp->cl_list); cn != NULL; - cn = uu_list_next(clp->cl_list, cn)) { - - if (strcmp(cn->cn_handle->zfs_name, name) == 0) { - uu_list_remove(clp->cl_list, cn); - zfs_close(cn->cn_handle); - free(cn); - return; - } - } -} - -/* - * Release any memory associated with a changelist. - */ -void -changelist_free(prop_changelist_t *clp) -{ - prop_changenode_t *cn; - void *cookie; - - if (clp->cl_list) { - cookie = NULL; - while ((cn = uu_list_teardown(clp->cl_list, &cookie)) != NULL) { - zfs_close(cn->cn_handle); - free(cn); - } - - uu_list_destroy(clp->cl_list); - } - if (clp->cl_pool) - uu_list_pool_destroy(clp->cl_pool); - - free(clp); -} - -static int -change_one(zfs_handle_t *zhp, void *data) -{ - prop_changelist_t *clp = data; - char property[ZFS_MAXPROPLEN]; - char where[64]; - prop_changenode_t *cn; - zprop_source_t sourcetype; - zprop_source_t share_sourcetype; - - /* - * We only want to unmount/unshare those filesystems that may inherit - * from the target filesystem. If we find any filesystem with a - * locally set mountpoint, we ignore any children since changing the - * property will not affect them. If this is a rename, we iterate - * over all children regardless, since we need them unmounted in - * order to do the rename. Also, if this is a volume and we're doing - * a rename, then always add it to the changelist. - */ - - if (!(ZFS_IS_VOLUME(zhp) && clp->cl_realprop == ZFS_PROP_NAME) && - zfs_prop_get(zhp, clp->cl_prop, property, - sizeof (property), &sourcetype, where, sizeof (where), - B_FALSE) != 0) { - zfs_close(zhp); - return (0); - } - - /* - * If we are "watching" sharenfs or sharesmb - * then check out the companion property which is tracked - * in cl_shareprop - */ - if (clp->cl_shareprop != ZPROP_INVAL && - zfs_prop_get(zhp, clp->cl_shareprop, property, - sizeof (property), &share_sourcetype, where, sizeof (where), - B_FALSE) != 0) { - zfs_close(zhp); - return (0); - } - - if (clp->cl_alldependents || clp->cl_allchildren || - sourcetype == ZPROP_SRC_DEFAULT || - sourcetype == ZPROP_SRC_INHERITED || - (clp->cl_shareprop != ZPROP_INVAL && - (share_sourcetype == ZPROP_SRC_DEFAULT || - share_sourcetype == ZPROP_SRC_INHERITED))) { - if ((cn = zfs_alloc(zfs_get_handle(zhp), - sizeof (prop_changenode_t))) == NULL) { - zfs_close(zhp); - return (-1); - } - - cn->cn_handle = zhp; - cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) || - zfs_is_mounted(zhp, NULL); - cn->cn_shared = zfs_is_shared(zhp); - cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED); - cn->cn_needpost = B_TRUE; - - /* Indicate if any child is exported to a local zone. */ - if (getzoneid() == GLOBAL_ZONEID && cn->cn_zoned) - clp->cl_haszonedchild = B_TRUE; - - uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool); - - if (clp->cl_sorted) { - uu_list_index_t idx; - - (void) uu_list_find(clp->cl_list, cn, NULL, - &idx); - uu_list_insert(clp->cl_list, cn, idx); - } else { - /* - * Add this child to beginning of the list. Children - * below this one in the hierarchy will get added above - * this one in the list. This produces a list in - * reverse dataset name order. - * This is necessary when the original mountpoint - * is legacy or none. - */ - verify(uu_list_insert_before(clp->cl_list, - uu_list_first(clp->cl_list), cn) == 0); - } - - if (!clp->cl_alldependents) - return (zfs_iter_children(zhp, change_one, data)); - } else { - zfs_close(zhp); - } - - return (0); -} - -/*ARGSUSED*/ -static int -compare_mountpoints(const void *a, const void *b, void *unused) -{ - const prop_changenode_t *ca = a; - const prop_changenode_t *cb = b; - - char mounta[MAXPATHLEN]; - char mountb[MAXPATHLEN]; - - boolean_t hasmounta, hasmountb; - - /* - * When unsharing or unmounting filesystems, we need to do it in - * mountpoint order. This allows the user to have a mountpoint - * hierarchy that is different from the dataset hierarchy, and still - * allow it to be changed. However, if either dataset doesn't have a - * mountpoint (because it is a volume or a snapshot), we place it at the - * end of the list, because it doesn't affect our change at all. - */ - hasmounta = (zfs_prop_get(ca->cn_handle, ZFS_PROP_MOUNTPOINT, mounta, - sizeof (mounta), NULL, NULL, 0, B_FALSE) == 0); - hasmountb = (zfs_prop_get(cb->cn_handle, ZFS_PROP_MOUNTPOINT, mountb, - sizeof (mountb), NULL, NULL, 0, B_FALSE) == 0); - - if (!hasmounta && hasmountb) - return (-1); - else if (hasmounta && !hasmountb) - return (1); - else if (!hasmounta && !hasmountb) - return (0); - else - return (strcmp(mountb, mounta)); -} - -/* - * Given a ZFS handle and a property, construct a complete list of datasets - * that need to be modified as part of this process. For anything but the - * 'mountpoint' and 'sharenfs' properties, this just returns an empty list. - * Otherwise, we iterate over all children and look for any datasets that - * inherit the property. For each such dataset, we add it to the list and - * mark whether it was shared beforehand. - */ -prop_changelist_t * -changelist_gather(zfs_handle_t *zhp, zfs_prop_t prop, int gather_flags, - int mnt_flags) -{ - prop_changelist_t *clp; - prop_changenode_t *cn; - zfs_handle_t *temp; - char property[ZFS_MAXPROPLEN]; - uu_compare_fn_t *compare = NULL; - boolean_t legacy = B_FALSE; - - if ((clp = zfs_alloc(zhp->zfs_hdl, sizeof (prop_changelist_t))) == NULL) - return (NULL); - - /* - * For mountpoint-related tasks, we want to sort everything by - * mountpoint, so that we mount and unmount them in the appropriate - * order, regardless of their position in the hierarchy. - */ - if (prop == ZFS_PROP_NAME || prop == ZFS_PROP_ZONED || - prop == ZFS_PROP_MOUNTPOINT || prop == ZFS_PROP_SHARENFS || - prop == ZFS_PROP_SHARESMB) { - - if (zfs_prop_get(zhp, ZFS_PROP_MOUNTPOINT, - property, sizeof (property), - NULL, NULL, 0, B_FALSE) == 0 && - (strcmp(property, "legacy") == 0 || - strcmp(property, "none") == 0)) { - - legacy = B_TRUE; - } - if (!legacy) { - compare = compare_mountpoints; - clp->cl_sorted = B_TRUE; - } - } - - clp->cl_pool = uu_list_pool_create("changelist_pool", - sizeof (prop_changenode_t), - offsetof(prop_changenode_t, cn_listnode), - compare, 0); - if (clp->cl_pool == NULL) { - assert(uu_error() == UU_ERROR_NO_MEMORY); - (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error"); - changelist_free(clp); - return (NULL); - } - - clp->cl_list = uu_list_create(clp->cl_pool, NULL, - clp->cl_sorted ? UU_LIST_SORTED : 0); - clp->cl_gflags = gather_flags; - clp->cl_mflags = mnt_flags; - - if (clp->cl_list == NULL) { - assert(uu_error() == UU_ERROR_NO_MEMORY); - (void) zfs_error(zhp->zfs_hdl, EZFS_NOMEM, "internal error"); - changelist_free(clp); - return (NULL); - } - - /* - * If this is a rename or the 'zoned' property, we pretend we're - * changing the mountpoint and flag it so we can catch all children in - * change_one(). - * - * Flag cl_alldependents to catch all children plus the dependents - * (clones) that are not in the hierarchy. - */ - if (prop == ZFS_PROP_NAME) { - clp->cl_prop = ZFS_PROP_MOUNTPOINT; - clp->cl_alldependents = B_TRUE; - } else if (prop == ZFS_PROP_ZONED) { - clp->cl_prop = ZFS_PROP_MOUNTPOINT; - clp->cl_allchildren = B_TRUE; - } else if (prop == ZFS_PROP_CANMOUNT) { - clp->cl_prop = ZFS_PROP_MOUNTPOINT; - } else if (prop == ZFS_PROP_VOLSIZE) { - clp->cl_prop = ZFS_PROP_MOUNTPOINT; - } else { - clp->cl_prop = prop; - } - clp->cl_realprop = prop; - - if (clp->cl_prop != ZFS_PROP_MOUNTPOINT && - clp->cl_prop != ZFS_PROP_SHARENFS && - clp->cl_prop != ZFS_PROP_SHARESMB) - return (clp); - - /* - * If watching SHARENFS or SHARESMB then - * also watch its companion property. - */ - if (clp->cl_prop == ZFS_PROP_SHARENFS) - clp->cl_shareprop = ZFS_PROP_SHARESMB; - else if (clp->cl_prop == ZFS_PROP_SHARESMB) - clp->cl_shareprop = ZFS_PROP_SHARENFS; - - if (clp->cl_alldependents) { - if (zfs_iter_dependents(zhp, B_TRUE, change_one, clp) != 0) { - changelist_free(clp); - return (NULL); - } - } else if (zfs_iter_children(zhp, change_one, clp) != 0) { - changelist_free(clp); - return (NULL); - } - - /* - * We have to re-open ourselves because we auto-close all the handles - * and can't tell the difference. - */ - if ((temp = zfs_open(zhp->zfs_hdl, zfs_get_name(zhp), - ZFS_TYPE_DATASET)) == NULL) { - changelist_free(clp); - return (NULL); - } - - /* - * Always add ourself to the list. We add ourselves to the end so that - * we're the last to be unmounted. - */ - if ((cn = zfs_alloc(zhp->zfs_hdl, - sizeof (prop_changenode_t))) == NULL) { - zfs_close(temp); - changelist_free(clp); - return (NULL); - } - - cn->cn_handle = temp; - cn->cn_mounted = (clp->cl_gflags & CL_GATHER_MOUNT_ALWAYS) || - zfs_is_mounted(temp, NULL); - cn->cn_shared = zfs_is_shared(temp); - cn->cn_zoned = zfs_prop_get_int(zhp, ZFS_PROP_ZONED); - cn->cn_needpost = B_TRUE; - - uu_list_node_init(cn, &cn->cn_listnode, clp->cl_pool); - if (clp->cl_sorted) { - uu_list_index_t idx; - (void) uu_list_find(clp->cl_list, cn, NULL, &idx); - uu_list_insert(clp->cl_list, cn, idx); - } else { - /* - * Add the target dataset to the end of the list. - * The list is not really unsorted. The list will be - * in reverse dataset name order. This is necessary - * when the original mountpoint is legacy or none. - */ - verify(uu_list_insert_after(clp->cl_list, - uu_list_last(clp->cl_list), cn) == 0); - } - - /* - * If the mountpoint property was previously 'legacy', or 'none', - * record it as the behavior of changelist_postfix() will be different. - */ - if ((clp->cl_prop == ZFS_PROP_MOUNTPOINT) && legacy) { - /* - * do not automatically mount ex-legacy datasets if - * we specifically set canmount to noauto - */ - if (zfs_prop_get_int(zhp, ZFS_PROP_CANMOUNT) != - ZFS_CANMOUNT_NOAUTO) - clp->cl_waslegacy = B_TRUE; - } - - return (clp); -} |