1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

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22/*
23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
25 * Copyright (c) 2012 by Delphix. All rights reserved.
26 */
27
28#include <sys/zfs_context.h>
29#include <sys/spa.h>
30#include <sys/spa_impl.h>
31#include <sys/nvpair.h>
32#include <sys/uio.h>
33#include <sys/fs/zfs.h>
34#include <sys/vdev_impl.h>
35#include <sys/zfs_ioctl.h>
36#include <sys/utsname.h>
37#include <sys/sunddi.h>

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134
135out:
136 if (buf != NULL)
137 kmem_free(buf, fsize);
138
139 kobj_close_file(file);
140}
141
142static void
143spa_config_write(spa_config_dirent_t *dp, nvlist_t *nvl)
144{
145 size_t buflen;
146 char *buf;
147 vnode_t *vp;
148 int oflags = FWRITE | FTRUNC | FCREAT | FOFFMAX;
149 char *temp;
150
151 /*
152 * If the nvlist is empty (NULL), then remove the old cachefile.
153 */
154 if (nvl == NULL) {
155 (void) vn_remove(dp->scd_path, UIO_SYSSPACE, RMFILE);
156 return;
157 }
158
159 /*
160 * Pack the configuration into a buffer.
161 */
162 VERIFY(nvlist_size(nvl, &buflen, NV_ENCODE_XDR) == 0);
163
164 buf = kmem_alloc(buflen, KM_SLEEP);

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169
170 /*
171 * Write the configuration to disk. We need to do the traditional
172 * 'write to temporary file, sync, move over original' to make sure we
173 * always have a consistent view of the data.
174 */
175 (void) snprintf(temp, MAXPATHLEN, "%s.tmp", dp->scd_path);
176
177 if (vn_open(temp, UIO_SYSSPACE, oflags, 0644, &vp, CRCREAT, 0) == 0) {
178 if (vn_rdwr(UIO_WRITE, vp, buf, buflen, 0, UIO_SYSSPACE,
179 0, RLIM64_INFINITY, kcred, NULL) == 0 &&
180 VOP_FSYNC(vp, FSYNC, kcred, NULL) == 0) {
181 (void) vn_rename(temp, dp->scd_path, UIO_SYSSPACE);
182 }
183 (void) VOP_CLOSE(vp, oflags, 1, 0, kcred, NULL);
184 }
185
186 (void) vn_remove(temp, UIO_SYSSPACE, RMFILE);
187
188 kmem_free(buf, buflen);
189 kmem_free(temp, MAXPATHLEN);
190}
191
192/*
193 * Synchronize pool configuration to disk. This must be called with the
194 * namespace lock held.
195 */
196void
197spa_config_sync(spa_t *target, boolean_t removing, boolean_t postsysevent)
198{
199 spa_config_dirent_t *dp, *tdp;
200 nvlist_t *nvl;
201
202 ASSERT(MUTEX_HELD(&spa_namespace_lock));
203
204 if (rootdir == NULL || !(spa_mode_global & FWRITE))
205 return;
206
207 /*
208 * Iterate over all cachefiles for the pool, past or present. When the
209 * cachefile is changed, the new one is pushed onto this list, allowing
210 * us to update previous cachefiles that no longer contain this pool.
211 */
212 for (dp = list_head(&target->spa_config_list); dp != NULL;
213 dp = list_next(&target->spa_config_list, dp)) {
214 spa_t *spa = NULL;
215 if (dp->scd_path == NULL)
216 continue;
217
218 /*
219 * Iterate over all pools, adding any matching pools to 'nvl'.

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244 VERIFY(nvlist_alloc(&nvl, NV_UNIQUE_NAME,
245 KM_SLEEP) == 0);
246
247 VERIFY(nvlist_add_nvlist(nvl, spa->spa_name,
248 spa->spa_config) == 0);
249 mutex_exit(&spa->spa_props_lock);
250 }
251
252 spa_config_write(dp, nvl);
253 nvlist_free(nvl);
254 }
255
256 /*
257 * Remove any config entries older than the current one.
258 */
259 dp = list_head(&target->spa_config_list);
260 while ((tdp = list_next(&target->spa_config_list, dp)) != NULL) {
261 list_remove(&target->spa_config_list, tdp);
262 if (tdp->scd_path != NULL)
263 spa_strfree(tdp->scd_path);

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