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34dc7c2f BB |
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 | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
9ae529ec | 21 | |
34dc7c2f | 22 | /* |
428870ff | 23 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
4a0ee12a | 24 | * Copyright (c) 2012, 2016 by Delphix. All rights reserved. |
34dc7c2f BB |
25 | */ |
26 | ||
34dc7c2f BB |
27 | /* |
28 | * Virtual Device Labels | |
29 | * --------------------- | |
30 | * | |
31 | * The vdev label serves several distinct purposes: | |
32 | * | |
33 | * 1. Uniquely identify this device as part of a ZFS pool and confirm its | |
34 | * identity within the pool. | |
35 | * | |
0dc2f70c | 36 | * 2. Verify that all the devices given in a configuration are present |
34dc7c2f BB |
37 | * within the pool. |
38 | * | |
0dc2f70c | 39 | * 3. Determine the uberblock for the pool. |
34dc7c2f | 40 | * |
0dc2f70c | 41 | * 4. In case of an import operation, determine the configuration of the |
34dc7c2f BB |
42 | * toplevel vdev of which it is a part. |
43 | * | |
0dc2f70c | 44 | * 5. If an import operation cannot find all the devices in the pool, |
34dc7c2f BB |
45 | * provide enough information to the administrator to determine which |
46 | * devices are missing. | |
47 | * | |
48 | * It is important to note that while the kernel is responsible for writing the | |
49 | * label, it only consumes the information in the first three cases. The | |
50 | * latter information is only consumed in userland when determining the | |
51 | * configuration to import a pool. | |
52 | * | |
53 | * | |
54 | * Label Organization | |
55 | * ------------------ | |
56 | * | |
57 | * Before describing the contents of the label, it's important to understand how | |
58 | * the labels are written and updated with respect to the uberblock. | |
59 | * | |
60 | * When the pool configuration is altered, either because it was newly created | |
61 | * or a device was added, we want to update all the labels such that we can deal | |
62 | * with fatal failure at any point. To this end, each disk has two labels which | |
63 | * are updated before and after the uberblock is synced. Assuming we have | |
64 | * labels and an uberblock with the following transaction groups: | |
65 | * | |
66 | * L1 UB L2 | |
67 | * +------+ +------+ +------+ | |
68 | * | | | | | | | |
69 | * | t10 | | t10 | | t10 | | |
70 | * | | | | | | | |
71 | * +------+ +------+ +------+ | |
72 | * | |
73 | * In this stable state, the labels and the uberblock were all updated within | |
74 | * the same transaction group (10). Each label is mirrored and checksummed, so | |
75 | * that we can detect when we fail partway through writing the label. | |
76 | * | |
77 | * In order to identify which labels are valid, the labels are written in the | |
78 | * following manner: | |
79 | * | |
0dc2f70c MA |
80 | * 1. For each vdev, update 'L1' to the new label |
81 | * 2. Update the uberblock | |
82 | * 3. For each vdev, update 'L2' to the new label | |
34dc7c2f BB |
83 | * |
84 | * Given arbitrary failure, we can determine the correct label to use based on | |
85 | * the transaction group. If we fail after updating L1 but before updating the | |
86 | * UB, we will notice that L1's transaction group is greater than the uberblock, | |
87 | * so L2 must be valid. If we fail after writing the uberblock but before | |
88 | * writing L2, we will notice that L2's transaction group is less than L1, and | |
89 | * therefore L1 is valid. | |
90 | * | |
91 | * Another added complexity is that not every label is updated when the config | |
92 | * is synced. If we add a single device, we do not want to have to re-write | |
93 | * every label for every device in the pool. This means that both L1 and L2 may | |
94 | * be older than the pool uberblock, because the necessary information is stored | |
95 | * on another vdev. | |
96 | * | |
97 | * | |
98 | * On-disk Format | |
99 | * -------------- | |
100 | * | |
101 | * The vdev label consists of two distinct parts, and is wrapped within the | |
102 | * vdev_label_t structure. The label includes 8k of padding to permit legacy | |
103 | * VTOC disk labels, but is otherwise ignored. | |
104 | * | |
105 | * The first half of the label is a packed nvlist which contains pool wide | |
106 | * properties, per-vdev properties, and configuration information. It is | |
107 | * described in more detail below. | |
108 | * | |
109 | * The latter half of the label consists of a redundant array of uberblocks. | |
110 | * These uberblocks are updated whenever a transaction group is committed, | |
111 | * or when the configuration is updated. When a pool is loaded, we scan each | |
112 | * vdev for the 'best' uberblock. | |
113 | * | |
114 | * | |
115 | * Configuration Information | |
116 | * ------------------------- | |
117 | * | |
118 | * The nvlist describing the pool and vdev contains the following elements: | |
119 | * | |
0dc2f70c MA |
120 | * version ZFS on-disk version |
121 | * name Pool name | |
122 | * state Pool state | |
123 | * txg Transaction group in which this label was written | |
124 | * pool_guid Unique identifier for this pool | |
125 | * vdev_tree An nvlist describing vdev tree. | |
9ae529ec CS |
126 | * features_for_read |
127 | * An nvlist of the features necessary for reading the MOS. | |
34dc7c2f BB |
128 | * |
129 | * Each leaf device label also contains the following: | |
130 | * | |
0dc2f70c MA |
131 | * top_guid Unique ID for top-level vdev in which this is contained |
132 | * guid Unique ID for the leaf vdev | |
34dc7c2f BB |
133 | * |
134 | * The 'vs' configuration follows the format described in 'spa_config.c'. | |
135 | */ | |
136 | ||
137 | #include <sys/zfs_context.h> | |
138 | #include <sys/spa.h> | |
139 | #include <sys/spa_impl.h> | |
140 | #include <sys/dmu.h> | |
141 | #include <sys/zap.h> | |
142 | #include <sys/vdev.h> | |
143 | #include <sys/vdev_impl.h> | |
144 | #include <sys/uberblock_impl.h> | |
145 | #include <sys/metaslab.h> | |
a1d477c2 | 146 | #include <sys/metaslab_impl.h> |
34dc7c2f | 147 | #include <sys/zio.h> |
428870ff | 148 | #include <sys/dsl_scan.h> |
a6255b7f | 149 | #include <sys/abd.h> |
34dc7c2f BB |
150 | #include <sys/fs/zfs.h> |
151 | ||
152 | /* | |
153 | * Basic routines to read and write from a vdev label. | |
154 | * Used throughout the rest of this file. | |
155 | */ | |
156 | uint64_t | |
157 | vdev_label_offset(uint64_t psize, int l, uint64_t offset) | |
158 | { | |
159 | ASSERT(offset < sizeof (vdev_label_t)); | |
160 | ASSERT(P2PHASE_TYPED(psize, sizeof (vdev_label_t), uint64_t) == 0); | |
161 | ||
162 | return (offset + l * sizeof (vdev_label_t) + (l < VDEV_LABELS / 2 ? | |
163 | 0 : psize - VDEV_LABELS * sizeof (vdev_label_t))); | |
164 | } | |
165 | ||
b128c09f BB |
166 | /* |
167 | * Returns back the vdev label associated with the passed in offset. | |
168 | */ | |
169 | int | |
170 | vdev_label_number(uint64_t psize, uint64_t offset) | |
171 | { | |
172 | int l; | |
173 | ||
174 | if (offset >= psize - VDEV_LABEL_END_SIZE) { | |
175 | offset -= psize - VDEV_LABEL_END_SIZE; | |
176 | offset += (VDEV_LABELS / 2) * sizeof (vdev_label_t); | |
177 | } | |
178 | l = offset / sizeof (vdev_label_t); | |
179 | return (l < VDEV_LABELS ? l : -1); | |
180 | } | |
181 | ||
34dc7c2f | 182 | static void |
a6255b7f | 183 | vdev_label_read(zio_t *zio, vdev_t *vd, int l, abd_t *buf, uint64_t offset, |
e9aa730c | 184 | uint64_t size, zio_done_func_t *done, void *private, int flags) |
34dc7c2f | 185 | { |
0091d66f OF |
186 | ASSERT( |
187 | spa_config_held(zio->io_spa, SCL_STATE, RW_READER) == SCL_STATE || | |
188 | spa_config_held(zio->io_spa, SCL_STATE, RW_WRITER) == SCL_STATE); | |
b128c09f | 189 | ASSERT(flags & ZIO_FLAG_CONFIG_WRITER); |
34dc7c2f BB |
190 | |
191 | zio_nowait(zio_read_phys(zio, vd, | |
192 | vdev_label_offset(vd->vdev_psize, l, offset), | |
193 | size, buf, ZIO_CHECKSUM_LABEL, done, private, | |
b128c09f | 194 | ZIO_PRIORITY_SYNC_READ, flags, B_TRUE)); |
34dc7c2f BB |
195 | } |
196 | ||
379ca9cf | 197 | void |
a6255b7f | 198 | vdev_label_write(zio_t *zio, vdev_t *vd, int l, abd_t *buf, uint64_t offset, |
e9aa730c | 199 | uint64_t size, zio_done_func_t *done, void *private, int flags) |
34dc7c2f | 200 | { |
0091d66f OF |
201 | ASSERT( |
202 | spa_config_held(zio->io_spa, SCL_STATE, RW_READER) == SCL_STATE || | |
203 | spa_config_held(zio->io_spa, SCL_STATE, RW_WRITER) == SCL_STATE); | |
b128c09f | 204 | ASSERT(flags & ZIO_FLAG_CONFIG_WRITER); |
34dc7c2f BB |
205 | |
206 | zio_nowait(zio_write_phys(zio, vd, | |
207 | vdev_label_offset(vd->vdev_psize, l, offset), | |
208 | size, buf, ZIO_CHECKSUM_LABEL, done, private, | |
209 | ZIO_PRIORITY_SYNC_WRITE, flags, B_TRUE)); | |
210 | } | |
211 | ||
193a37cb TH |
212 | /* |
213 | * Generate the nvlist representing this vdev's stats | |
214 | */ | |
215 | void | |
216 | vdev_config_generate_stats(vdev_t *vd, nvlist_t *nv) | |
217 | { | |
218 | nvlist_t *nvx; | |
219 | vdev_stat_t *vs; | |
220 | vdev_stat_ex_t *vsx; | |
221 | ||
222 | vs = kmem_alloc(sizeof (*vs), KM_SLEEP); | |
223 | vsx = kmem_alloc(sizeof (*vsx), KM_SLEEP); | |
224 | ||
225 | vdev_get_stats_ex(vd, vs, vsx); | |
226 | fnvlist_add_uint64_array(nv, ZPOOL_CONFIG_VDEV_STATS, | |
227 | (uint64_t *)vs, sizeof (*vs) / sizeof (uint64_t)); | |
228 | ||
229 | kmem_free(vs, sizeof (*vs)); | |
230 | ||
231 | /* | |
232 | * Add extended stats into a special extended stats nvlist. This keeps | |
233 | * all the extended stats nicely grouped together. The extended stats | |
234 | * nvlist is then added to the main nvlist. | |
235 | */ | |
236 | nvx = fnvlist_alloc(); | |
237 | ||
238 | /* ZIOs in flight to disk */ | |
239 | fnvlist_add_uint64(nvx, ZPOOL_CONFIG_VDEV_SYNC_R_ACTIVE_QUEUE, | |
240 | vsx->vsx_active_queue[ZIO_PRIORITY_SYNC_READ]); | |
241 | ||
242 | fnvlist_add_uint64(nvx, ZPOOL_CONFIG_VDEV_SYNC_W_ACTIVE_QUEUE, | |
243 | vsx->vsx_active_queue[ZIO_PRIORITY_SYNC_WRITE]); | |
244 | ||
245 | fnvlist_add_uint64(nvx, ZPOOL_CONFIG_VDEV_ASYNC_R_ACTIVE_QUEUE, | |
246 | vsx->vsx_active_queue[ZIO_PRIORITY_ASYNC_READ]); | |
247 | ||
248 | fnvlist_add_uint64(nvx, ZPOOL_CONFIG_VDEV_ASYNC_W_ACTIVE_QUEUE, | |
249 | vsx->vsx_active_queue[ZIO_PRIORITY_ASYNC_WRITE]); | |
250 | ||
251 | fnvlist_add_uint64(nvx, ZPOOL_CONFIG_VDEV_SCRUB_ACTIVE_QUEUE, | |
252 | vsx->vsx_active_queue[ZIO_PRIORITY_SCRUB]); | |
253 | ||
254 | /* ZIOs pending */ | |
255 | fnvlist_add_uint64(nvx, ZPOOL_CONFIG_VDEV_SYNC_R_PEND_QUEUE, | |
256 | vsx->vsx_pend_queue[ZIO_PRIORITY_SYNC_READ]); | |
257 | ||
258 | fnvlist_add_uint64(nvx, ZPOOL_CONFIG_VDEV_SYNC_W_PEND_QUEUE, | |
259 | vsx->vsx_pend_queue[ZIO_PRIORITY_SYNC_WRITE]); | |
260 | ||
261 | fnvlist_add_uint64(nvx, ZPOOL_CONFIG_VDEV_ASYNC_R_PEND_QUEUE, | |
262 | vsx->vsx_pend_queue[ZIO_PRIORITY_ASYNC_READ]); | |
263 | ||
264 | fnvlist_add_uint64(nvx, ZPOOL_CONFIG_VDEV_ASYNC_W_PEND_QUEUE, | |
265 | vsx->vsx_pend_queue[ZIO_PRIORITY_ASYNC_WRITE]); | |
266 | ||
267 | fnvlist_add_uint64(nvx, ZPOOL_CONFIG_VDEV_SCRUB_PEND_QUEUE, | |
268 | vsx->vsx_pend_queue[ZIO_PRIORITY_SCRUB]); | |
269 | ||
270 | /* Histograms */ | |
271 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_TOT_R_LAT_HISTO, | |
272 | vsx->vsx_total_histo[ZIO_TYPE_READ], | |
273 | ARRAY_SIZE(vsx->vsx_total_histo[ZIO_TYPE_READ])); | |
274 | ||
275 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_TOT_W_LAT_HISTO, | |
276 | vsx->vsx_total_histo[ZIO_TYPE_WRITE], | |
277 | ARRAY_SIZE(vsx->vsx_total_histo[ZIO_TYPE_WRITE])); | |
278 | ||
279 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_DISK_R_LAT_HISTO, | |
280 | vsx->vsx_disk_histo[ZIO_TYPE_READ], | |
281 | ARRAY_SIZE(vsx->vsx_disk_histo[ZIO_TYPE_READ])); | |
282 | ||
283 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_DISK_W_LAT_HISTO, | |
284 | vsx->vsx_disk_histo[ZIO_TYPE_WRITE], | |
285 | ARRAY_SIZE(vsx->vsx_disk_histo[ZIO_TYPE_WRITE])); | |
286 | ||
287 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_SYNC_R_LAT_HISTO, | |
288 | vsx->vsx_queue_histo[ZIO_PRIORITY_SYNC_READ], | |
289 | ARRAY_SIZE(vsx->vsx_queue_histo[ZIO_PRIORITY_SYNC_READ])); | |
290 | ||
291 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_SYNC_W_LAT_HISTO, | |
292 | vsx->vsx_queue_histo[ZIO_PRIORITY_SYNC_WRITE], | |
293 | ARRAY_SIZE(vsx->vsx_queue_histo[ZIO_PRIORITY_SYNC_WRITE])); | |
294 | ||
295 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_ASYNC_R_LAT_HISTO, | |
296 | vsx->vsx_queue_histo[ZIO_PRIORITY_ASYNC_READ], | |
297 | ARRAY_SIZE(vsx->vsx_queue_histo[ZIO_PRIORITY_ASYNC_READ])); | |
298 | ||
299 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_ASYNC_W_LAT_HISTO, | |
300 | vsx->vsx_queue_histo[ZIO_PRIORITY_ASYNC_WRITE], | |
301 | ARRAY_SIZE(vsx->vsx_queue_histo[ZIO_PRIORITY_ASYNC_WRITE])); | |
302 | ||
303 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_SCRUB_LAT_HISTO, | |
304 | vsx->vsx_queue_histo[ZIO_PRIORITY_SCRUB], | |
305 | ARRAY_SIZE(vsx->vsx_queue_histo[ZIO_PRIORITY_SCRUB])); | |
306 | ||
7e945072 TH |
307 | /* Request sizes */ |
308 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_SYNC_IND_R_HISTO, | |
309 | vsx->vsx_ind_histo[ZIO_PRIORITY_SYNC_READ], | |
310 | ARRAY_SIZE(vsx->vsx_ind_histo[ZIO_PRIORITY_SYNC_READ])); | |
311 | ||
312 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_SYNC_IND_W_HISTO, | |
313 | vsx->vsx_ind_histo[ZIO_PRIORITY_SYNC_WRITE], | |
314 | ARRAY_SIZE(vsx->vsx_ind_histo[ZIO_PRIORITY_SYNC_WRITE])); | |
315 | ||
316 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_ASYNC_IND_R_HISTO, | |
317 | vsx->vsx_ind_histo[ZIO_PRIORITY_ASYNC_READ], | |
318 | ARRAY_SIZE(vsx->vsx_ind_histo[ZIO_PRIORITY_ASYNC_READ])); | |
319 | ||
320 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_ASYNC_IND_W_HISTO, | |
321 | vsx->vsx_ind_histo[ZIO_PRIORITY_ASYNC_WRITE], | |
322 | ARRAY_SIZE(vsx->vsx_ind_histo[ZIO_PRIORITY_ASYNC_WRITE])); | |
323 | ||
324 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_IND_SCRUB_HISTO, | |
325 | vsx->vsx_ind_histo[ZIO_PRIORITY_SCRUB], | |
326 | ARRAY_SIZE(vsx->vsx_ind_histo[ZIO_PRIORITY_SCRUB])); | |
327 | ||
328 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_SYNC_AGG_R_HISTO, | |
329 | vsx->vsx_agg_histo[ZIO_PRIORITY_SYNC_READ], | |
330 | ARRAY_SIZE(vsx->vsx_agg_histo[ZIO_PRIORITY_SYNC_READ])); | |
331 | ||
332 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_SYNC_AGG_W_HISTO, | |
333 | vsx->vsx_agg_histo[ZIO_PRIORITY_SYNC_WRITE], | |
334 | ARRAY_SIZE(vsx->vsx_agg_histo[ZIO_PRIORITY_SYNC_WRITE])); | |
335 | ||
336 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_ASYNC_AGG_R_HISTO, | |
337 | vsx->vsx_agg_histo[ZIO_PRIORITY_ASYNC_READ], | |
338 | ARRAY_SIZE(vsx->vsx_agg_histo[ZIO_PRIORITY_ASYNC_READ])); | |
339 | ||
340 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_ASYNC_AGG_W_HISTO, | |
341 | vsx->vsx_agg_histo[ZIO_PRIORITY_ASYNC_WRITE], | |
342 | ARRAY_SIZE(vsx->vsx_agg_histo[ZIO_PRIORITY_ASYNC_WRITE])); | |
343 | ||
344 | fnvlist_add_uint64_array(nvx, ZPOOL_CONFIG_VDEV_AGG_SCRUB_HISTO, | |
345 | vsx->vsx_agg_histo[ZIO_PRIORITY_SCRUB], | |
346 | ARRAY_SIZE(vsx->vsx_agg_histo[ZIO_PRIORITY_SCRUB])); | |
347 | ||
193a37cb TH |
348 | /* Add extended stats nvlist to main nvlist */ |
349 | fnvlist_add_nvlist(nv, ZPOOL_CONFIG_VDEV_STATS_EX, nvx); | |
350 | ||
6a796725 | 351 | fnvlist_free(nvx); |
193a37cb TH |
352 | kmem_free(vsx, sizeof (*vsx)); |
353 | } | |
354 | ||
34dc7c2f BB |
355 | /* |
356 | * Generate the nvlist representing this vdev's config. | |
357 | */ | |
358 | nvlist_t * | |
359 | vdev_config_generate(spa_t *spa, vdev_t *vd, boolean_t getstats, | |
428870ff | 360 | vdev_config_flag_t flags) |
34dc7c2f BB |
361 | { |
362 | nvlist_t *nv = NULL; | |
a1d477c2 MA |
363 | vdev_indirect_config_t *vic = &vd->vdev_indirect_config; |
364 | ||
79c76d5b | 365 | nv = fnvlist_alloc(); |
34dc7c2f | 366 | |
5d1f7fb6 | 367 | fnvlist_add_string(nv, ZPOOL_CONFIG_TYPE, vd->vdev_ops->vdev_op_type); |
428870ff | 368 | if (!(flags & (VDEV_CONFIG_SPARE | VDEV_CONFIG_L2CACHE))) |
5d1f7fb6 GW |
369 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_ID, vd->vdev_id); |
370 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_GUID, vd->vdev_guid); | |
34dc7c2f BB |
371 | |
372 | if (vd->vdev_path != NULL) | |
5d1f7fb6 | 373 | fnvlist_add_string(nv, ZPOOL_CONFIG_PATH, vd->vdev_path); |
34dc7c2f BB |
374 | |
375 | if (vd->vdev_devid != NULL) | |
5d1f7fb6 | 376 | fnvlist_add_string(nv, ZPOOL_CONFIG_DEVID, vd->vdev_devid); |
34dc7c2f BB |
377 | |
378 | if (vd->vdev_physpath != NULL) | |
5d1f7fb6 GW |
379 | fnvlist_add_string(nv, ZPOOL_CONFIG_PHYS_PATH, |
380 | vd->vdev_physpath); | |
34dc7c2f | 381 | |
1bbd8770 TH |
382 | if (vd->vdev_enc_sysfs_path != NULL) |
383 | fnvlist_add_string(nv, ZPOOL_CONFIG_VDEV_ENC_SYSFS_PATH, | |
384 | vd->vdev_enc_sysfs_path); | |
385 | ||
9babb374 | 386 | if (vd->vdev_fru != NULL) |
5d1f7fb6 | 387 | fnvlist_add_string(nv, ZPOOL_CONFIG_FRU, vd->vdev_fru); |
9babb374 | 388 | |
34dc7c2f BB |
389 | if (vd->vdev_nparity != 0) { |
390 | ASSERT(strcmp(vd->vdev_ops->vdev_op_type, | |
391 | VDEV_TYPE_RAIDZ) == 0); | |
392 | ||
393 | /* | |
394 | * Make sure someone hasn't managed to sneak a fancy new vdev | |
395 | * into a crufty old storage pool. | |
396 | */ | |
397 | ASSERT(vd->vdev_nparity == 1 || | |
45d1cae3 BB |
398 | (vd->vdev_nparity <= 2 && |
399 | spa_version(spa) >= SPA_VERSION_RAIDZ2) || | |
400 | (vd->vdev_nparity <= 3 && | |
401 | spa_version(spa) >= SPA_VERSION_RAIDZ3)); | |
34dc7c2f BB |
402 | |
403 | /* | |
404 | * Note that we'll add the nparity tag even on storage pools | |
405 | * that only support a single parity device -- older software | |
406 | * will just ignore it. | |
407 | */ | |
5d1f7fb6 | 408 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_NPARITY, vd->vdev_nparity); |
34dc7c2f BB |
409 | } |
410 | ||
411 | if (vd->vdev_wholedisk != -1ULL) | |
5d1f7fb6 GW |
412 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, |
413 | vd->vdev_wholedisk); | |
34dc7c2f | 414 | |
6cb8e530 | 415 | if (vd->vdev_not_present && !(flags & VDEV_CONFIG_MISSING)) |
5d1f7fb6 | 416 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, 1); |
34dc7c2f BB |
417 | |
418 | if (vd->vdev_isspare) | |
5d1f7fb6 | 419 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_IS_SPARE, 1); |
34dc7c2f | 420 | |
428870ff BB |
421 | if (!(flags & (VDEV_CONFIG_SPARE | VDEV_CONFIG_L2CACHE)) && |
422 | vd == vd->vdev_top) { | |
5d1f7fb6 GW |
423 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY, |
424 | vd->vdev_ms_array); | |
425 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT, | |
426 | vd->vdev_ms_shift); | |
427 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_ASHIFT, vd->vdev_ashift); | |
428 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_ASIZE, | |
429 | vd->vdev_asize); | |
430 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_IS_LOG, vd->vdev_islog); | |
a1d477c2 | 431 | if (vd->vdev_removing) { |
5d1f7fb6 GW |
432 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_REMOVING, |
433 | vd->vdev_removing); | |
a1d477c2 | 434 | } |
34dc7c2f BB |
435 | } |
436 | ||
93cf2076 | 437 | if (vd->vdev_dtl_sm != NULL) { |
5d1f7fb6 | 438 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_DTL, |
93cf2076 GW |
439 | space_map_object(vd->vdev_dtl_sm)); |
440 | } | |
34dc7c2f | 441 | |
a1d477c2 MA |
442 | if (vic->vic_mapping_object != 0) { |
443 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_INDIRECT_OBJECT, | |
444 | vic->vic_mapping_object); | |
445 | } | |
446 | ||
447 | if (vic->vic_births_object != 0) { | |
448 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_INDIRECT_BIRTHS, | |
449 | vic->vic_births_object); | |
450 | } | |
451 | ||
452 | if (vic->vic_prev_indirect_vdev != UINT64_MAX) { | |
453 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_PREV_INDIRECT_VDEV, | |
454 | vic->vic_prev_indirect_vdev); | |
455 | } | |
456 | ||
428870ff | 457 | if (vd->vdev_crtxg) |
5d1f7fb6 | 458 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_CREATE_TXG, vd->vdev_crtxg); |
428870ff | 459 | |
e0ab3ab5 JS |
460 | if (flags & VDEV_CONFIG_MOS) { |
461 | if (vd->vdev_leaf_zap != 0) { | |
462 | ASSERT(vd->vdev_ops->vdev_op_leaf); | |
463 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_VDEV_LEAF_ZAP, | |
464 | vd->vdev_leaf_zap); | |
465 | } | |
466 | ||
467 | if (vd->vdev_top_zap != 0) { | |
468 | ASSERT(vd == vd->vdev_top); | |
469 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_VDEV_TOP_ZAP, | |
470 | vd->vdev_top_zap); | |
471 | } | |
472 | } | |
473 | ||
34dc7c2f | 474 | if (getstats) { |
193a37cb | 475 | vdev_config_generate_stats(vd, nv); |
428870ff BB |
476 | |
477 | /* provide either current or previous scan information */ | |
a1d477c2 | 478 | pool_scan_stat_t ps; |
428870ff | 479 | if (spa_scan_get_stats(spa, &ps) == 0) { |
5d1f7fb6 | 480 | fnvlist_add_uint64_array(nv, |
428870ff | 481 | ZPOOL_CONFIG_SCAN_STATS, (uint64_t *)&ps, |
5d1f7fb6 | 482 | sizeof (pool_scan_stat_t) / sizeof (uint64_t)); |
428870ff | 483 | } |
a1d477c2 MA |
484 | |
485 | pool_removal_stat_t prs; | |
486 | if (spa_removal_get_stats(spa, &prs) == 0) { | |
487 | fnvlist_add_uint64_array(nv, | |
488 | ZPOOL_CONFIG_REMOVAL_STATS, (uint64_t *)&prs, | |
489 | sizeof (prs) / sizeof (uint64_t)); | |
490 | } | |
491 | ||
492 | /* | |
493 | * Note: this can be called from open context | |
494 | * (spa_get_stats()), so we need the rwlock to prevent | |
495 | * the mapping from being changed by condensing. | |
496 | */ | |
497 | rw_enter(&vd->vdev_indirect_rwlock, RW_READER); | |
498 | if (vd->vdev_indirect_mapping != NULL) { | |
499 | ASSERT(vd->vdev_indirect_births != NULL); | |
500 | vdev_indirect_mapping_t *vim = | |
501 | vd->vdev_indirect_mapping; | |
502 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_INDIRECT_SIZE, | |
503 | vdev_indirect_mapping_size(vim)); | |
504 | } | |
505 | rw_exit(&vd->vdev_indirect_rwlock); | |
506 | if (vd->vdev_mg != NULL && | |
507 | vd->vdev_mg->mg_fragmentation != ZFS_FRAG_INVALID) { | |
508 | /* | |
509 | * Compute approximately how much memory would be used | |
510 | * for the indirect mapping if this device were to | |
511 | * be removed. | |
512 | * | |
513 | * Note: If the frag metric is invalid, then not | |
514 | * enough metaslabs have been converted to have | |
515 | * histograms. | |
516 | */ | |
517 | uint64_t seg_count = 0; | |
0dc2f70c | 518 | uint64_t to_alloc = vd->vdev_stat.vs_alloc; |
a1d477c2 MA |
519 | |
520 | /* | |
521 | * There are the same number of allocated segments | |
522 | * as free segments, so we will have at least one | |
0dc2f70c MA |
523 | * entry per free segment. However, small free |
524 | * segments (smaller than vdev_removal_max_span) | |
525 | * will be combined with adjacent allocated segments | |
526 | * as a single mapping. | |
a1d477c2 MA |
527 | */ |
528 | for (int i = 0; i < RANGE_TREE_HISTOGRAM_SIZE; i++) { | |
0dc2f70c MA |
529 | if (1ULL << (i + 1) < vdev_removal_max_span) { |
530 | to_alloc += | |
531 | vd->vdev_mg->mg_histogram[i] << | |
532 | (i + 1); | |
533 | } else { | |
534 | seg_count += | |
535 | vd->vdev_mg->mg_histogram[i]; | |
536 | } | |
a1d477c2 MA |
537 | } |
538 | ||
539 | /* | |
0dc2f70c MA |
540 | * The maximum length of a mapping is |
541 | * zfs_remove_max_segment, so we need at least one entry | |
542 | * per zfs_remove_max_segment of allocated data. | |
a1d477c2 | 543 | */ |
0dc2f70c | 544 | seg_count += to_alloc / zfs_remove_max_segment; |
a1d477c2 MA |
545 | |
546 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_INDIRECT_SIZE, | |
547 | seg_count * | |
548 | sizeof (vdev_indirect_mapping_entry_phys_t)); | |
549 | } | |
34dc7c2f BB |
550 | } |
551 | ||
552 | if (!vd->vdev_ops->vdev_op_leaf) { | |
553 | nvlist_t **child; | |
428870ff BB |
554 | int c, idx; |
555 | ||
556 | ASSERT(!vd->vdev_ishole); | |
34dc7c2f BB |
557 | |
558 | child = kmem_alloc(vd->vdev_children * sizeof (nvlist_t *), | |
79c76d5b | 559 | KM_SLEEP); |
34dc7c2f | 560 | |
428870ff BB |
561 | for (c = 0, idx = 0; c < vd->vdev_children; c++) { |
562 | vdev_t *cvd = vd->vdev_child[c]; | |
34dc7c2f | 563 | |
428870ff BB |
564 | /* |
565 | * If we're generating an nvlist of removing | |
566 | * vdevs then skip over any device which is | |
567 | * not being removed. | |
568 | */ | |
569 | if ((flags & VDEV_CONFIG_REMOVING) && | |
570 | !cvd->vdev_removing) | |
571 | continue; | |
34dc7c2f | 572 | |
428870ff BB |
573 | child[idx++] = vdev_config_generate(spa, cvd, |
574 | getstats, flags); | |
575 | } | |
576 | ||
577 | if (idx) { | |
5d1f7fb6 GW |
578 | fnvlist_add_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, |
579 | child, idx); | |
428870ff BB |
580 | } |
581 | ||
582 | for (c = 0; c < idx; c++) | |
34dc7c2f BB |
583 | nvlist_free(child[c]); |
584 | ||
585 | kmem_free(child, vd->vdev_children * sizeof (nvlist_t *)); | |
586 | ||
587 | } else { | |
428870ff BB |
588 | const char *aux = NULL; |
589 | ||
34dc7c2f | 590 | if (vd->vdev_offline && !vd->vdev_tmpoffline) |
5d1f7fb6 GW |
591 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_OFFLINE, B_TRUE); |
592 | if (vd->vdev_resilver_txg != 0) | |
593 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_RESILVER_TXG, | |
594 | vd->vdev_resilver_txg); | |
34dc7c2f | 595 | if (vd->vdev_faulted) |
5d1f7fb6 | 596 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_FAULTED, B_TRUE); |
34dc7c2f | 597 | if (vd->vdev_degraded) |
5d1f7fb6 | 598 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_DEGRADED, B_TRUE); |
34dc7c2f | 599 | if (vd->vdev_removed) |
5d1f7fb6 | 600 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_REMOVED, B_TRUE); |
34dc7c2f | 601 | if (vd->vdev_unspare) |
5d1f7fb6 | 602 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_UNSPARE, B_TRUE); |
428870ff | 603 | if (vd->vdev_ishole) |
5d1f7fb6 | 604 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_IS_HOLE, B_TRUE); |
428870ff | 605 | |
4a283c7f | 606 | /* Set the reason why we're FAULTED/DEGRADED. */ |
428870ff BB |
607 | switch (vd->vdev_stat.vs_aux) { |
608 | case VDEV_AUX_ERR_EXCEEDED: | |
609 | aux = "err_exceeded"; | |
610 | break; | |
611 | ||
612 | case VDEV_AUX_EXTERNAL: | |
613 | aux = "external"; | |
614 | break; | |
615 | } | |
616 | ||
4a283c7f | 617 | if (aux != NULL && !vd->vdev_tmpoffline) { |
5d1f7fb6 | 618 | fnvlist_add_string(nv, ZPOOL_CONFIG_AUX_STATE, aux); |
4a283c7f TH |
619 | } else { |
620 | /* | |
621 | * We're healthy - clear any previous AUX_STATE values. | |
622 | */ | |
623 | if (nvlist_exists(nv, ZPOOL_CONFIG_AUX_STATE)) | |
624 | nvlist_remove_all(nv, ZPOOL_CONFIG_AUX_STATE); | |
625 | } | |
428870ff BB |
626 | |
627 | if (vd->vdev_splitting && vd->vdev_orig_guid != 0LL) { | |
5d1f7fb6 GW |
628 | fnvlist_add_uint64(nv, ZPOOL_CONFIG_ORIG_GUID, |
629 | vd->vdev_orig_guid); | |
428870ff | 630 | } |
34dc7c2f BB |
631 | } |
632 | ||
633 | return (nv); | |
634 | } | |
635 | ||
428870ff BB |
636 | /* |
637 | * Generate a view of the top-level vdevs. If we currently have holes | |
638 | * in the namespace, then generate an array which contains a list of holey | |
639 | * vdevs. Additionally, add the number of top-level children that currently | |
640 | * exist. | |
641 | */ | |
642 | void | |
643 | vdev_top_config_generate(spa_t *spa, nvlist_t *config) | |
644 | { | |
645 | vdev_t *rvd = spa->spa_root_vdev; | |
646 | uint64_t *array; | |
647 | uint_t c, idx; | |
648 | ||
79c76d5b | 649 | array = kmem_alloc(rvd->vdev_children * sizeof (uint64_t), KM_SLEEP); |
428870ff BB |
650 | |
651 | for (c = 0, idx = 0; c < rvd->vdev_children; c++) { | |
652 | vdev_t *tvd = rvd->vdev_child[c]; | |
653 | ||
a1d477c2 | 654 | if (tvd->vdev_ishole) { |
428870ff | 655 | array[idx++] = c; |
a1d477c2 | 656 | } |
428870ff BB |
657 | } |
658 | ||
659 | if (idx) { | |
660 | VERIFY(nvlist_add_uint64_array(config, ZPOOL_CONFIG_HOLE_ARRAY, | |
661 | array, idx) == 0); | |
662 | } | |
663 | ||
664 | VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VDEV_CHILDREN, | |
665 | rvd->vdev_children) == 0); | |
666 | ||
667 | kmem_free(array, rvd->vdev_children * sizeof (uint64_t)); | |
668 | } | |
669 | ||
9ae529ec | 670 | /* |
3bc7e0fb GW |
671 | * Returns the configuration from the label of the given vdev. For vdevs |
672 | * which don't have a txg value stored on their label (i.e. spares/cache) | |
673 | * or have not been completely initialized (txg = 0) just return | |
674 | * the configuration from the first valid label we find. Otherwise, | |
675 | * find the most up-to-date label that does not exceed the specified | |
676 | * 'txg' value. | |
9ae529ec | 677 | */ |
34dc7c2f | 678 | nvlist_t * |
3bc7e0fb | 679 | vdev_label_read_config(vdev_t *vd, uint64_t txg) |
34dc7c2f BB |
680 | { |
681 | spa_t *spa = vd->vdev_spa; | |
682 | nvlist_t *config = NULL; | |
683 | vdev_phys_t *vp; | |
a6255b7f | 684 | abd_t *vp_abd; |
34dc7c2f | 685 | zio_t *zio; |
3bc7e0fb | 686 | uint64_t best_txg = 0; |
38a19edd | 687 | uint64_t label_txg = 0; |
3bc7e0fb | 688 | int error = 0; |
9babb374 BB |
689 | int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL | |
690 | ZIO_FLAG_SPECULATIVE; | |
34dc7c2f | 691 | |
b128c09f | 692 | ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); |
34dc7c2f BB |
693 | |
694 | if (!vdev_readable(vd)) | |
695 | return (NULL); | |
696 | ||
a6255b7f DQ |
697 | vp_abd = abd_alloc_linear(sizeof (vdev_phys_t), B_TRUE); |
698 | vp = abd_to_buf(vp_abd); | |
34dc7c2f | 699 | |
9babb374 | 700 | retry: |
1c27024e | 701 | for (int l = 0; l < VDEV_LABELS; l++) { |
3bc7e0fb | 702 | nvlist_t *label = NULL; |
34dc7c2f | 703 | |
b128c09f | 704 | zio = zio_root(spa, NULL, NULL, flags); |
34dc7c2f | 705 | |
a6255b7f | 706 | vdev_label_read(zio, vd, l, vp_abd, |
34dc7c2f | 707 | offsetof(vdev_label_t, vl_vdev_phys), |
b128c09f | 708 | sizeof (vdev_phys_t), NULL, NULL, flags); |
34dc7c2f BB |
709 | |
710 | if (zio_wait(zio) == 0 && | |
711 | nvlist_unpack(vp->vp_nvlist, sizeof (vp->vp_nvlist), | |
3bc7e0fb | 712 | &label, 0) == 0) { |
3bc7e0fb GW |
713 | /* |
714 | * Auxiliary vdevs won't have txg values in their | |
715 | * labels and newly added vdevs may not have been | |
716 | * completely initialized so just return the | |
717 | * configuration from the first valid label we | |
718 | * encounter. | |
719 | */ | |
720 | error = nvlist_lookup_uint64(label, | |
721 | ZPOOL_CONFIG_POOL_TXG, &label_txg); | |
722 | if ((error || label_txg == 0) && !config) { | |
723 | config = label; | |
724 | break; | |
725 | } else if (label_txg <= txg && label_txg > best_txg) { | |
726 | best_txg = label_txg; | |
727 | nvlist_free(config); | |
728 | config = fnvlist_dup(label); | |
729 | } | |
730 | } | |
34dc7c2f | 731 | |
3bc7e0fb GW |
732 | if (label != NULL) { |
733 | nvlist_free(label); | |
734 | label = NULL; | |
34dc7c2f BB |
735 | } |
736 | } | |
737 | ||
9babb374 BB |
738 | if (config == NULL && !(flags & ZIO_FLAG_TRYHARD)) { |
739 | flags |= ZIO_FLAG_TRYHARD; | |
740 | goto retry; | |
741 | } | |
742 | ||
38a19edd PZ |
743 | /* |
744 | * We found a valid label but it didn't pass txg restrictions. | |
745 | */ | |
746 | if (config == NULL && label_txg != 0) { | |
747 | vdev_dbgmsg(vd, "label discarded as txg is too large " | |
748 | "(%llu > %llu)", (u_longlong_t)label_txg, | |
749 | (u_longlong_t)txg); | |
750 | } | |
751 | ||
a6255b7f | 752 | abd_free(vp_abd); |
34dc7c2f BB |
753 | |
754 | return (config); | |
755 | } | |
756 | ||
757 | /* | |
758 | * Determine if a device is in use. The 'spare_guid' parameter will be filled | |
759 | * in with the device guid if this spare is active elsewhere on the system. | |
760 | */ | |
761 | static boolean_t | |
762 | vdev_inuse(vdev_t *vd, uint64_t crtxg, vdev_labeltype_t reason, | |
763 | uint64_t *spare_guid, uint64_t *l2cache_guid) | |
764 | { | |
765 | spa_t *spa = vd->vdev_spa; | |
766 | uint64_t state, pool_guid, device_guid, txg, spare_pool; | |
767 | uint64_t vdtxg = 0; | |
768 | nvlist_t *label; | |
769 | ||
770 | if (spare_guid) | |
771 | *spare_guid = 0ULL; | |
772 | if (l2cache_guid) | |
773 | *l2cache_guid = 0ULL; | |
774 | ||
775 | /* | |
776 | * Read the label, if any, and perform some basic sanity checks. | |
777 | */ | |
3bc7e0fb | 778 | if ((label = vdev_label_read_config(vd, -1ULL)) == NULL) |
34dc7c2f BB |
779 | return (B_FALSE); |
780 | ||
781 | (void) nvlist_lookup_uint64(label, ZPOOL_CONFIG_CREATE_TXG, | |
782 | &vdtxg); | |
783 | ||
784 | if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, | |
785 | &state) != 0 || | |
786 | nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, | |
787 | &device_guid) != 0) { | |
788 | nvlist_free(label); | |
789 | return (B_FALSE); | |
790 | } | |
791 | ||
792 | if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && | |
793 | (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_GUID, | |
794 | &pool_guid) != 0 || | |
795 | nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_TXG, | |
796 | &txg) != 0)) { | |
797 | nvlist_free(label); | |
798 | return (B_FALSE); | |
799 | } | |
800 | ||
801 | nvlist_free(label); | |
802 | ||
803 | /* | |
804 | * Check to see if this device indeed belongs to the pool it claims to | |
805 | * be a part of. The only way this is allowed is if the device is a hot | |
806 | * spare (which we check for later on). | |
807 | */ | |
808 | if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && | |
809 | !spa_guid_exists(pool_guid, device_guid) && | |
b128c09f | 810 | !spa_spare_exists(device_guid, NULL, NULL) && |
34dc7c2f BB |
811 | !spa_l2cache_exists(device_guid, NULL)) |
812 | return (B_FALSE); | |
813 | ||
814 | /* | |
815 | * If the transaction group is zero, then this an initialized (but | |
816 | * unused) label. This is only an error if the create transaction | |
817 | * on-disk is the same as the one we're using now, in which case the | |
818 | * user has attempted to add the same vdev multiple times in the same | |
819 | * transaction. | |
820 | */ | |
821 | if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && | |
822 | txg == 0 && vdtxg == crtxg) | |
823 | return (B_TRUE); | |
824 | ||
825 | /* | |
826 | * Check to see if this is a spare device. We do an explicit check for | |
827 | * spa_has_spare() here because it may be on our pending list of spares | |
828 | * to add. We also check if it is an l2cache device. | |
829 | */ | |
b128c09f | 830 | if (spa_spare_exists(device_guid, &spare_pool, NULL) || |
34dc7c2f BB |
831 | spa_has_spare(spa, device_guid)) { |
832 | if (spare_guid) | |
833 | *spare_guid = device_guid; | |
834 | ||
835 | switch (reason) { | |
836 | case VDEV_LABEL_CREATE: | |
837 | case VDEV_LABEL_L2CACHE: | |
838 | return (B_TRUE); | |
839 | ||
840 | case VDEV_LABEL_REPLACE: | |
841 | return (!spa_has_spare(spa, device_guid) || | |
842 | spare_pool != 0ULL); | |
843 | ||
844 | case VDEV_LABEL_SPARE: | |
845 | return (spa_has_spare(spa, device_guid)); | |
e75c13c3 BB |
846 | default: |
847 | break; | |
34dc7c2f BB |
848 | } |
849 | } | |
850 | ||
851 | /* | |
852 | * Check to see if this is an l2cache device. | |
853 | */ | |
854 | if (spa_l2cache_exists(device_guid, NULL)) | |
855 | return (B_TRUE); | |
856 | ||
572e2857 BB |
857 | /* |
858 | * We can't rely on a pool's state if it's been imported | |
859 | * read-only. Instead we look to see if the pools is marked | |
860 | * read-only in the namespace and set the state to active. | |
861 | */ | |
485c581c RY |
862 | if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && |
863 | (spa = spa_by_guid(pool_guid, device_guid)) != NULL && | |
572e2857 BB |
864 | spa_mode(spa) == FREAD) |
865 | state = POOL_STATE_ACTIVE; | |
866 | ||
34dc7c2f BB |
867 | /* |
868 | * If the device is marked ACTIVE, then this device is in use by another | |
869 | * pool on the system. | |
870 | */ | |
871 | return (state == POOL_STATE_ACTIVE); | |
872 | } | |
873 | ||
874 | /* | |
875 | * Initialize a vdev label. We check to make sure each leaf device is not in | |
876 | * use, and writable. We put down an initial label which we will later | |
877 | * overwrite with a complete label. Note that it's important to do this | |
878 | * sequentially, not in parallel, so that we catch cases of multiple use of the | |
879 | * same leaf vdev in the vdev we're creating -- e.g. mirroring a disk with | |
880 | * itself. | |
881 | */ | |
882 | int | |
883 | vdev_label_init(vdev_t *vd, uint64_t crtxg, vdev_labeltype_t reason) | |
884 | { | |
885 | spa_t *spa = vd->vdev_spa; | |
886 | nvlist_t *label; | |
887 | vdev_phys_t *vp; | |
a6255b7f DQ |
888 | abd_t *vp_abd; |
889 | abd_t *pad2; | |
34dc7c2f | 890 | uberblock_t *ub; |
a6255b7f | 891 | abd_t *ub_abd; |
34dc7c2f | 892 | zio_t *zio; |
34dc7c2f BB |
893 | char *buf; |
894 | size_t buflen; | |
895 | int error; | |
d4ed6673 | 896 | uint64_t spare_guid = 0, l2cache_guid = 0; |
b128c09f | 897 | int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL; |
34dc7c2f | 898 | |
b128c09f | 899 | ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); |
34dc7c2f | 900 | |
1c27024e | 901 | for (int c = 0; c < vd->vdev_children; c++) |
34dc7c2f BB |
902 | if ((error = vdev_label_init(vd->vdev_child[c], |
903 | crtxg, reason)) != 0) | |
904 | return (error); | |
905 | ||
428870ff BB |
906 | /* Track the creation time for this vdev */ |
907 | vd->vdev_crtxg = crtxg; | |
908 | ||
dda12da9 | 909 | if (!vd->vdev_ops->vdev_op_leaf || !spa_writeable(spa)) |
34dc7c2f BB |
910 | return (0); |
911 | ||
912 | /* | |
913 | * Dead vdevs cannot be initialized. | |
914 | */ | |
915 | if (vdev_is_dead(vd)) | |
2e528b49 | 916 | return (SET_ERROR(EIO)); |
34dc7c2f BB |
917 | |
918 | /* | |
919 | * Determine if the vdev is in use. | |
920 | */ | |
428870ff | 921 | if (reason != VDEV_LABEL_REMOVE && reason != VDEV_LABEL_SPLIT && |
34dc7c2f | 922 | vdev_inuse(vd, crtxg, reason, &spare_guid, &l2cache_guid)) |
2e528b49 | 923 | return (SET_ERROR(EBUSY)); |
34dc7c2f | 924 | |
34dc7c2f BB |
925 | /* |
926 | * If this is a request to add or replace a spare or l2cache device | |
927 | * that is in use elsewhere on the system, then we must update the | |
928 | * guid (which was initialized to a random value) to reflect the | |
929 | * actual GUID (which is shared between multiple pools). | |
930 | */ | |
931 | if (reason != VDEV_LABEL_REMOVE && reason != VDEV_LABEL_L2CACHE && | |
932 | spare_guid != 0ULL) { | |
b128c09f | 933 | uint64_t guid_delta = spare_guid - vd->vdev_guid; |
34dc7c2f | 934 | |
b128c09f | 935 | vd->vdev_guid += guid_delta; |
34dc7c2f | 936 | |
1c27024e | 937 | for (vdev_t *pvd = vd; pvd != NULL; pvd = pvd->vdev_parent) |
b128c09f | 938 | pvd->vdev_guid_sum += guid_delta; |
34dc7c2f BB |
939 | |
940 | /* | |
941 | * If this is a replacement, then we want to fallthrough to the | |
942 | * rest of the code. If we're adding a spare, then it's already | |
943 | * labeled appropriately and we can just return. | |
944 | */ | |
945 | if (reason == VDEV_LABEL_SPARE) | |
946 | return (0); | |
428870ff BB |
947 | ASSERT(reason == VDEV_LABEL_REPLACE || |
948 | reason == VDEV_LABEL_SPLIT); | |
34dc7c2f BB |
949 | } |
950 | ||
951 | if (reason != VDEV_LABEL_REMOVE && reason != VDEV_LABEL_SPARE && | |
952 | l2cache_guid != 0ULL) { | |
b128c09f | 953 | uint64_t guid_delta = l2cache_guid - vd->vdev_guid; |
34dc7c2f | 954 | |
b128c09f | 955 | vd->vdev_guid += guid_delta; |
34dc7c2f | 956 | |
1c27024e | 957 | for (vdev_t *pvd = vd; pvd != NULL; pvd = pvd->vdev_parent) |
b128c09f | 958 | pvd->vdev_guid_sum += guid_delta; |
34dc7c2f BB |
959 | |
960 | /* | |
961 | * If this is a replacement, then we want to fallthrough to the | |
962 | * rest of the code. If we're adding an l2cache, then it's | |
963 | * already labeled appropriately and we can just return. | |
964 | */ | |
965 | if (reason == VDEV_LABEL_L2CACHE) | |
966 | return (0); | |
967 | ASSERT(reason == VDEV_LABEL_REPLACE); | |
968 | } | |
969 | ||
970 | /* | |
971 | * Initialize its label. | |
972 | */ | |
a6255b7f DQ |
973 | vp_abd = abd_alloc_linear(sizeof (vdev_phys_t), B_TRUE); |
974 | abd_zero(vp_abd, sizeof (vdev_phys_t)); | |
975 | vp = abd_to_buf(vp_abd); | |
34dc7c2f BB |
976 | |
977 | /* | |
978 | * Generate a label describing the pool and our top-level vdev. | |
979 | * We mark it as being from txg 0 to indicate that it's not | |
980 | * really part of an active pool just yet. The labels will | |
981 | * be written again with a meaningful txg by spa_sync(). | |
982 | */ | |
983 | if (reason == VDEV_LABEL_SPARE || | |
984 | (reason == VDEV_LABEL_REMOVE && vd->vdev_isspare)) { | |
985 | /* | |
986 | * For inactive hot spares, we generate a special label that | |
987 | * identifies as a mutually shared hot spare. We write the | |
988 | * label if we are adding a hot spare, or if we are removing an | |
989 | * active hot spare (in which case we want to revert the | |
990 | * labels). | |
991 | */ | |
79c76d5b | 992 | VERIFY(nvlist_alloc(&label, NV_UNIQUE_NAME, KM_SLEEP) == 0); |
34dc7c2f BB |
993 | |
994 | VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_VERSION, | |
995 | spa_version(spa)) == 0); | |
996 | VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_POOL_STATE, | |
997 | POOL_STATE_SPARE) == 0); | |
998 | VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_GUID, | |
999 | vd->vdev_guid) == 0); | |
1000 | } else if (reason == VDEV_LABEL_L2CACHE || | |
1001 | (reason == VDEV_LABEL_REMOVE && vd->vdev_isl2cache)) { | |
1002 | /* | |
1003 | * For level 2 ARC devices, add a special label. | |
1004 | */ | |
79c76d5b | 1005 | VERIFY(nvlist_alloc(&label, NV_UNIQUE_NAME, KM_SLEEP) == 0); |
34dc7c2f BB |
1006 | |
1007 | VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_VERSION, | |
1008 | spa_version(spa)) == 0); | |
1009 | VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_POOL_STATE, | |
1010 | POOL_STATE_L2CACHE) == 0); | |
1011 | VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_GUID, | |
1012 | vd->vdev_guid) == 0); | |
1013 | } else { | |
428870ff BB |
1014 | uint64_t txg = 0ULL; |
1015 | ||
1016 | if (reason == VDEV_LABEL_SPLIT) | |
1017 | txg = spa->spa_uberblock.ub_txg; | |
1018 | label = spa_config_generate(spa, vd, txg, B_FALSE); | |
34dc7c2f BB |
1019 | |
1020 | /* | |
1021 | * Add our creation time. This allows us to detect multiple | |
1022 | * vdev uses as described above, and automatically expires if we | |
1023 | * fail. | |
1024 | */ | |
1025 | VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_CREATE_TXG, | |
1026 | crtxg) == 0); | |
1027 | } | |
1028 | ||
1029 | buf = vp->vp_nvlist; | |
1030 | buflen = sizeof (vp->vp_nvlist); | |
1031 | ||
79c76d5b | 1032 | error = nvlist_pack(label, &buf, &buflen, NV_ENCODE_XDR, KM_SLEEP); |
34dc7c2f BB |
1033 | if (error != 0) { |
1034 | nvlist_free(label); | |
a6255b7f | 1035 | abd_free(vp_abd); |
34dc7c2f | 1036 | /* EFAULT means nvlist_pack ran out of room */ |
ecb2b7dc | 1037 | return (SET_ERROR(error == EFAULT ? ENAMETOOLONG : EINVAL)); |
34dc7c2f BB |
1038 | } |
1039 | ||
34dc7c2f BB |
1040 | /* |
1041 | * Initialize uberblock template. | |
1042 | */ | |
a6255b7f DQ |
1043 | ub_abd = abd_alloc_linear(VDEV_UBERBLOCK_RING, B_TRUE); |
1044 | abd_zero(ub_abd, VDEV_UBERBLOCK_RING); | |
1045 | abd_copy_from_buf(ub_abd, &spa->spa_uberblock, sizeof (uberblock_t)); | |
1046 | ub = abd_to_buf(ub_abd); | |
34dc7c2f BB |
1047 | ub->ub_txg = 0; |
1048 | ||
9babb374 | 1049 | /* Initialize the 2nd padding area. */ |
a6255b7f DQ |
1050 | pad2 = abd_alloc_for_io(VDEV_PAD_SIZE, B_TRUE); |
1051 | abd_zero(pad2, VDEV_PAD_SIZE); | |
9babb374 | 1052 | |
34dc7c2f BB |
1053 | /* |
1054 | * Write everything in parallel. | |
1055 | */ | |
9babb374 | 1056 | retry: |
34dc7c2f BB |
1057 | zio = zio_root(spa, NULL, NULL, flags); |
1058 | ||
1c27024e | 1059 | for (int l = 0; l < VDEV_LABELS; l++) { |
34dc7c2f | 1060 | |
a6255b7f | 1061 | vdev_label_write(zio, vd, l, vp_abd, |
34dc7c2f BB |
1062 | offsetof(vdev_label_t, vl_vdev_phys), |
1063 | sizeof (vdev_phys_t), NULL, NULL, flags); | |
1064 | ||
9babb374 BB |
1065 | /* |
1066 | * Skip the 1st padding area. | |
1067 | * Zero out the 2nd padding area where it might have | |
1068 | * left over data from previous filesystem format. | |
1069 | */ | |
1070 | vdev_label_write(zio, vd, l, pad2, | |
1071 | offsetof(vdev_label_t, vl_pad2), | |
1072 | VDEV_PAD_SIZE, NULL, NULL, flags); | |
34dc7c2f | 1073 | |
a6255b7f | 1074 | vdev_label_write(zio, vd, l, ub_abd, |
45d1cae3 BB |
1075 | offsetof(vdev_label_t, vl_uberblock), |
1076 | VDEV_UBERBLOCK_RING, NULL, NULL, flags); | |
34dc7c2f BB |
1077 | } |
1078 | ||
1079 | error = zio_wait(zio); | |
1080 | ||
9babb374 BB |
1081 | if (error != 0 && !(flags & ZIO_FLAG_TRYHARD)) { |
1082 | flags |= ZIO_FLAG_TRYHARD; | |
1083 | goto retry; | |
1084 | } | |
1085 | ||
34dc7c2f | 1086 | nvlist_free(label); |
a6255b7f DQ |
1087 | abd_free(pad2); |
1088 | abd_free(ub_abd); | |
1089 | abd_free(vp_abd); | |
34dc7c2f BB |
1090 | |
1091 | /* | |
1092 | * If this vdev hasn't been previously identified as a spare, then we | |
1093 | * mark it as such only if a) we are labeling it as a spare, or b) it | |
1094 | * exists as a spare elsewhere in the system. Do the same for | |
1095 | * level 2 ARC devices. | |
1096 | */ | |
1097 | if (error == 0 && !vd->vdev_isspare && | |
1098 | (reason == VDEV_LABEL_SPARE || | |
b128c09f | 1099 | spa_spare_exists(vd->vdev_guid, NULL, NULL))) |
34dc7c2f BB |
1100 | spa_spare_add(vd); |
1101 | ||
1102 | if (error == 0 && !vd->vdev_isl2cache && | |
1103 | (reason == VDEV_LABEL_L2CACHE || | |
1104 | spa_l2cache_exists(vd->vdev_guid, NULL))) | |
1105 | spa_l2cache_add(vd); | |
1106 | ||
1107 | return (error); | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * ========================================================================== | |
1112 | * uberblock load/sync | |
1113 | * ========================================================================== | |
1114 | */ | |
1115 | ||
1116 | /* | |
1117 | * Consider the following situation: txg is safely synced to disk. We've | |
1118 | * written the first uberblock for txg + 1, and then we lose power. When we | |
1119 | * come back up, we fail to see the uberblock for txg + 1 because, say, | |
1120 | * it was on a mirrored device and the replica to which we wrote txg + 1 | |
1121 | * is now offline. If we then make some changes and sync txg + 1, and then | |
9ae529ec | 1122 | * the missing replica comes back, then for a few seconds we'll have two |
34dc7c2f BB |
1123 | * conflicting uberblocks on disk with the same txg. The solution is simple: |
1124 | * among uberblocks with equal txg, choose the one with the latest timestamp. | |
1125 | */ | |
1126 | static int | |
ee36c709 | 1127 | vdev_uberblock_compare(const uberblock_t *ub1, const uberblock_t *ub2) |
34dc7c2f | 1128 | { |
ee36c709 GN |
1129 | int cmp = AVL_CMP(ub1->ub_txg, ub2->ub_txg); |
1130 | if (likely(cmp)) | |
1131 | return (cmp); | |
34dc7c2f | 1132 | |
ee36c709 | 1133 | return (AVL_CMP(ub1->ub_timestamp, ub2->ub_timestamp)); |
34dc7c2f BB |
1134 | } |
1135 | ||
9ae529ec CS |
1136 | struct ubl_cbdata { |
1137 | uberblock_t *ubl_ubbest; /* Best uberblock */ | |
1138 | vdev_t *ubl_vd; /* vdev associated with the above */ | |
9ae529ec CS |
1139 | }; |
1140 | ||
34dc7c2f BB |
1141 | static void |
1142 | vdev_uberblock_load_done(zio_t *zio) | |
1143 | { | |
9ae529ec | 1144 | vdev_t *vd = zio->io_vd; |
428870ff | 1145 | spa_t *spa = zio->io_spa; |
b128c09f | 1146 | zio_t *rio = zio->io_private; |
a6255b7f | 1147 | uberblock_t *ub = abd_to_buf(zio->io_abd); |
9ae529ec | 1148 | struct ubl_cbdata *cbp = rio->io_private; |
34dc7c2f | 1149 | |
9ae529ec | 1150 | ASSERT3U(zio->io_size, ==, VDEV_UBERBLOCK_SIZE(vd)); |
34dc7c2f BB |
1151 | |
1152 | if (zio->io_error == 0 && uberblock_verify(ub) == 0) { | |
b128c09f | 1153 | mutex_enter(&rio->io_lock); |
428870ff | 1154 | if (ub->ub_txg <= spa->spa_load_max_txg && |
9ae529ec CS |
1155 | vdev_uberblock_compare(ub, cbp->ubl_ubbest) > 0) { |
1156 | /* | |
3bc7e0fb GW |
1157 | * Keep track of the vdev in which this uberblock |
1158 | * was found. We will use this information later | |
1159 | * to obtain the config nvlist associated with | |
9ae529ec CS |
1160 | * this uberblock. |
1161 | */ | |
1162 | *cbp->ubl_ubbest = *ub; | |
1163 | cbp->ubl_vd = vd; | |
9ae529ec | 1164 | } |
b128c09f | 1165 | mutex_exit(&rio->io_lock); |
34dc7c2f BB |
1166 | } |
1167 | ||
a6255b7f | 1168 | abd_free(zio->io_abd); |
34dc7c2f BB |
1169 | } |
1170 | ||
9ae529ec CS |
1171 | static void |
1172 | vdev_uberblock_load_impl(zio_t *zio, vdev_t *vd, int flags, | |
1173 | struct ubl_cbdata *cbp) | |
34dc7c2f | 1174 | { |
379ca9cf | 1175 | for (int c = 0; c < vd->vdev_children; c++) |
9ae529ec | 1176 | vdev_uberblock_load_impl(zio, vd->vdev_child[c], flags, cbp); |
34dc7c2f | 1177 | |
b128c09f | 1178 | if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) { |
379ca9cf OF |
1179 | for (int l = 0; l < VDEV_LABELS; l++) { |
1180 | for (int n = 0; n < VDEV_UBERBLOCK_COUNT(vd); n++) { | |
b128c09f | 1181 | vdev_label_read(zio, vd, l, |
a6255b7f DQ |
1182 | abd_alloc_linear(VDEV_UBERBLOCK_SIZE(vd), |
1183 | B_TRUE), VDEV_UBERBLOCK_OFFSET(vd, n), | |
b128c09f BB |
1184 | VDEV_UBERBLOCK_SIZE(vd), |
1185 | vdev_uberblock_load_done, zio, flags); | |
1186 | } | |
34dc7c2f BB |
1187 | } |
1188 | } | |
9ae529ec CS |
1189 | } |
1190 | ||
1191 | /* | |
1192 | * Reads the 'best' uberblock from disk along with its associated | |
1193 | * configuration. First, we read the uberblock array of each label of each | |
1194 | * vdev, keeping track of the uberblock with the highest txg in each array. | |
3bc7e0fb | 1195 | * Then, we read the configuration from the same vdev as the best uberblock. |
9ae529ec CS |
1196 | */ |
1197 | void | |
1198 | vdev_uberblock_load(vdev_t *rvd, uberblock_t *ub, nvlist_t **config) | |
1199 | { | |
9ae529ec CS |
1200 | zio_t *zio; |
1201 | spa_t *spa = rvd->vdev_spa; | |
1202 | struct ubl_cbdata cb; | |
1203 | int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL | | |
1204 | ZIO_FLAG_SPECULATIVE | ZIO_FLAG_TRYHARD; | |
1205 | ||
1206 | ASSERT(ub); | |
1207 | ASSERT(config); | |
b128c09f | 1208 | |
9ae529ec CS |
1209 | bzero(ub, sizeof (uberblock_t)); |
1210 | *config = NULL; | |
1211 | ||
1212 | cb.ubl_ubbest = ub; | |
1213 | cb.ubl_vd = NULL; | |
1214 | ||
1215 | spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); | |
1216 | zio = zio_root(spa, NULL, &cb, flags); | |
1217 | vdev_uberblock_load_impl(zio, rvd, flags, &cb); | |
1218 | (void) zio_wait(zio); | |
3bc7e0fb GW |
1219 | |
1220 | /* | |
1221 | * It's possible that the best uberblock was discovered on a label | |
1222 | * that has a configuration which was written in a future txg. | |
1223 | * Search all labels on this vdev to find the configuration that | |
1224 | * matches the txg for our uberblock. | |
1225 | */ | |
4a0ee12a PZ |
1226 | if (cb.ubl_vd != NULL) { |
1227 | vdev_dbgmsg(cb.ubl_vd, "best uberblock found for spa %s. " | |
1228 | "txg %llu", spa->spa_name, (u_longlong_t)ub->ub_txg); | |
1229 | ||
3bc7e0fb | 1230 | *config = vdev_label_read_config(cb.ubl_vd, ub->ub_txg); |
6cb8e530 PZ |
1231 | if (*config == NULL && spa->spa_extreme_rewind) { |
1232 | vdev_dbgmsg(cb.ubl_vd, "failed to read label config. " | |
1233 | "Trying again without txg restrictions."); | |
1234 | *config = vdev_label_read_config(cb.ubl_vd, UINT64_MAX); | |
1235 | } | |
4a0ee12a PZ |
1236 | if (*config == NULL) { |
1237 | vdev_dbgmsg(cb.ubl_vd, "failed to read label config"); | |
1238 | } | |
1239 | } | |
9ae529ec | 1240 | spa_config_exit(spa, SCL_ALL, FTAG); |
34dc7c2f BB |
1241 | } |
1242 | ||
9d3f7b87 OF |
1243 | /* |
1244 | * For use when a leaf vdev is expanded. | |
1245 | * The location of labels 2 and 3 changed, and at the new location the | |
1246 | * uberblock rings are either empty or contain garbage. The sync will write | |
1247 | * new configs there because the vdev is dirty, but expansion also needs the | |
1248 | * uberblock rings copied. Read them from label 0 which did not move. | |
1249 | * | |
1250 | * Since the point is to populate labels {2,3} with valid uberblocks, | |
1251 | * we zero uberblocks we fail to read or which are not valid. | |
1252 | */ | |
1253 | ||
1254 | static void | |
1255 | vdev_copy_uberblocks(vdev_t *vd) | |
1256 | { | |
1257 | abd_t *ub_abd; | |
1258 | zio_t *write_zio; | |
1259 | int locks = (SCL_L2ARC | SCL_ZIO); | |
1260 | int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL | | |
1261 | ZIO_FLAG_SPECULATIVE; | |
1262 | ||
1263 | ASSERT(spa_config_held(vd->vdev_spa, SCL_STATE, RW_READER) == | |
1264 | SCL_STATE); | |
1265 | ASSERT(vd->vdev_ops->vdev_op_leaf); | |
1266 | ||
1267 | spa_config_enter(vd->vdev_spa, locks, FTAG, RW_READER); | |
1268 | ||
eea2e241 | 1269 | ub_abd = abd_alloc_linear(VDEV_UBERBLOCK_SIZE(vd), B_TRUE); |
9d3f7b87 OF |
1270 | |
1271 | write_zio = zio_root(vd->vdev_spa, NULL, NULL, flags); | |
1272 | for (int n = 0; n < VDEV_UBERBLOCK_COUNT(vd); n++) { | |
1273 | const int src_label = 0; | |
1274 | zio_t *zio; | |
1275 | ||
1276 | zio = zio_root(vd->vdev_spa, NULL, NULL, flags); | |
1277 | vdev_label_read(zio, vd, src_label, ub_abd, | |
1278 | VDEV_UBERBLOCK_OFFSET(vd, n), VDEV_UBERBLOCK_SIZE(vd), | |
1279 | NULL, NULL, flags); | |
1280 | ||
1281 | if (zio_wait(zio) || uberblock_verify(abd_to_buf(ub_abd))) | |
1282 | abd_zero(ub_abd, VDEV_UBERBLOCK_SIZE(vd)); | |
1283 | ||
1284 | for (int l = 2; l < VDEV_LABELS; l++) | |
1285 | vdev_label_write(write_zio, vd, l, ub_abd, | |
1286 | VDEV_UBERBLOCK_OFFSET(vd, n), | |
1287 | VDEV_UBERBLOCK_SIZE(vd), NULL, NULL, | |
1288 | flags | ZIO_FLAG_DONT_PROPAGATE); | |
1289 | } | |
1290 | (void) zio_wait(write_zio); | |
1291 | ||
1292 | spa_config_exit(vd->vdev_spa, locks, FTAG); | |
1293 | ||
1294 | abd_free(ub_abd); | |
1295 | } | |
1296 | ||
34dc7c2f BB |
1297 | /* |
1298 | * On success, increment root zio's count of good writes. | |
1299 | * We only get credit for writes to known-visible vdevs; see spa_vdev_add(). | |
1300 | */ | |
1301 | static void | |
1302 | vdev_uberblock_sync_done(zio_t *zio) | |
1303 | { | |
1304 | uint64_t *good_writes = zio->io_private; | |
1305 | ||
1306 | if (zio->io_error == 0 && zio->io_vd->vdev_top->vdev_ms_array != 0) | |
bc89ac84 | 1307 | atomic_inc_64(good_writes); |
34dc7c2f BB |
1308 | } |
1309 | ||
1310 | /* | |
1311 | * Write the uberblock to all labels of all leaves of the specified vdev. | |
1312 | */ | |
1313 | static void | |
7f96cc23 MA |
1314 | vdev_uberblock_sync(zio_t *zio, uint64_t *good_writes, |
1315 | uberblock_t *ub, vdev_t *vd, int flags) | |
34dc7c2f | 1316 | { |
7f96cc23 MA |
1317 | for (uint64_t c = 0; c < vd->vdev_children; c++) { |
1318 | vdev_uberblock_sync(zio, good_writes, | |
1319 | ub, vd->vdev_child[c], flags); | |
1320 | } | |
34dc7c2f BB |
1321 | |
1322 | if (!vd->vdev_ops->vdev_op_leaf) | |
1323 | return; | |
1324 | ||
b128c09f | 1325 | if (!vdev_writeable(vd)) |
34dc7c2f BB |
1326 | return; |
1327 | ||
9d3f7b87 OF |
1328 | /* If the vdev was expanded, need to copy uberblock rings. */ |
1329 | if (vd->vdev_state == VDEV_STATE_HEALTHY && | |
1330 | vd->vdev_copy_uberblocks == B_TRUE) { | |
1331 | vdev_copy_uberblocks(vd); | |
1332 | vd->vdev_copy_uberblocks = B_FALSE; | |
1333 | } | |
1334 | ||
379ca9cf OF |
1335 | int m = spa_multihost(vd->vdev_spa) ? MMP_BLOCKS_PER_LABEL : 0; |
1336 | int n = ub->ub_txg % (VDEV_UBERBLOCK_COUNT(vd) - m); | |
34dc7c2f | 1337 | |
a6255b7f | 1338 | /* Copy the uberblock_t into the ABD */ |
379ca9cf | 1339 | abd_t *ub_abd = abd_alloc_for_io(VDEV_UBERBLOCK_SIZE(vd), B_TRUE); |
a6255b7f DQ |
1340 | abd_zero(ub_abd, VDEV_UBERBLOCK_SIZE(vd)); |
1341 | abd_copy_from_buf(ub_abd, ub, sizeof (uberblock_t)); | |
34dc7c2f | 1342 | |
379ca9cf | 1343 | for (int l = 0; l < VDEV_LABELS; l++) |
a6255b7f | 1344 | vdev_label_write(zio, vd, l, ub_abd, |
b128c09f | 1345 | VDEV_UBERBLOCK_OFFSET(vd, n), VDEV_UBERBLOCK_SIZE(vd), |
7f96cc23 | 1346 | vdev_uberblock_sync_done, good_writes, |
b128c09f | 1347 | flags | ZIO_FLAG_DONT_PROPAGATE); |
34dc7c2f | 1348 | |
a6255b7f | 1349 | abd_free(ub_abd); |
34dc7c2f BB |
1350 | } |
1351 | ||
e49f1e20 | 1352 | /* Sync the uberblocks to all vdevs in svd[] */ |
34dc7c2f BB |
1353 | int |
1354 | vdev_uberblock_sync_list(vdev_t **svd, int svdcount, uberblock_t *ub, int flags) | |
1355 | { | |
1356 | spa_t *spa = svd[0]->vdev_spa; | |
34dc7c2f BB |
1357 | zio_t *zio; |
1358 | uint64_t good_writes = 0; | |
1359 | ||
7f96cc23 | 1360 | zio = zio_root(spa, NULL, NULL, flags); |
34dc7c2f | 1361 | |
1c27024e | 1362 | for (int v = 0; v < svdcount; v++) |
7f96cc23 | 1363 | vdev_uberblock_sync(zio, &good_writes, ub, svd[v], flags); |
34dc7c2f BB |
1364 | |
1365 | (void) zio_wait(zio); | |
1366 | ||
1367 | /* | |
1368 | * Flush the uberblocks to disk. This ensures that the odd labels | |
1369 | * are no longer needed (because the new uberblocks and the even | |
1370 | * labels are safely on disk), so it is safe to overwrite them. | |
1371 | */ | |
1372 | zio = zio_root(spa, NULL, NULL, flags); | |
1373 | ||
a1d477c2 MA |
1374 | for (int v = 0; v < svdcount; v++) { |
1375 | if (vdev_writeable(svd[v])) { | |
1376 | zio_flush(zio, svd[v]); | |
1377 | } | |
1378 | } | |
34dc7c2f BB |
1379 | |
1380 | (void) zio_wait(zio); | |
1381 | ||
1382 | return (good_writes >= 1 ? 0 : EIO); | |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | * On success, increment the count of good writes for our top-level vdev. | |
1387 | */ | |
1388 | static void | |
1389 | vdev_label_sync_done(zio_t *zio) | |
1390 | { | |
1391 | uint64_t *good_writes = zio->io_private; | |
1392 | ||
1393 | if (zio->io_error == 0) | |
bc89ac84 | 1394 | atomic_inc_64(good_writes); |
34dc7c2f BB |
1395 | } |
1396 | ||
1397 | /* | |
1398 | * If there weren't enough good writes, indicate failure to the parent. | |
1399 | */ | |
1400 | static void | |
1401 | vdev_label_sync_top_done(zio_t *zio) | |
1402 | { | |
1403 | uint64_t *good_writes = zio->io_private; | |
1404 | ||
1405 | if (*good_writes == 0) | |
2e528b49 | 1406 | zio->io_error = SET_ERROR(EIO); |
34dc7c2f BB |
1407 | |
1408 | kmem_free(good_writes, sizeof (uint64_t)); | |
1409 | } | |
1410 | ||
b128c09f BB |
1411 | /* |
1412 | * We ignore errors for log and cache devices, simply free the private data. | |
1413 | */ | |
1414 | static void | |
1415 | vdev_label_sync_ignore_done(zio_t *zio) | |
1416 | { | |
1417 | kmem_free(zio->io_private, sizeof (uint64_t)); | |
1418 | } | |
1419 | ||
34dc7c2f BB |
1420 | /* |
1421 | * Write all even or odd labels to all leaves of the specified vdev. | |
1422 | */ | |
1423 | static void | |
7f96cc23 MA |
1424 | vdev_label_sync(zio_t *zio, uint64_t *good_writes, |
1425 | vdev_t *vd, int l, uint64_t txg, int flags) | |
34dc7c2f BB |
1426 | { |
1427 | nvlist_t *label; | |
1428 | vdev_phys_t *vp; | |
a6255b7f | 1429 | abd_t *vp_abd; |
34dc7c2f BB |
1430 | char *buf; |
1431 | size_t buflen; | |
34dc7c2f | 1432 | |
7f96cc23 MA |
1433 | for (int c = 0; c < vd->vdev_children; c++) { |
1434 | vdev_label_sync(zio, good_writes, | |
1435 | vd->vdev_child[c], l, txg, flags); | |
1436 | } | |
34dc7c2f BB |
1437 | |
1438 | if (!vd->vdev_ops->vdev_op_leaf) | |
1439 | return; | |
1440 | ||
b128c09f | 1441 | if (!vdev_writeable(vd)) |
34dc7c2f BB |
1442 | return; |
1443 | ||
1444 | /* | |
1445 | * Generate a label describing the top-level config to which we belong. | |
1446 | */ | |
1447 | label = spa_config_generate(vd->vdev_spa, vd, txg, B_FALSE); | |
1448 | ||
a6255b7f DQ |
1449 | vp_abd = abd_alloc_linear(sizeof (vdev_phys_t), B_TRUE); |
1450 | abd_zero(vp_abd, sizeof (vdev_phys_t)); | |
1451 | vp = abd_to_buf(vp_abd); | |
34dc7c2f BB |
1452 | |
1453 | buf = vp->vp_nvlist; | |
1454 | buflen = sizeof (vp->vp_nvlist); | |
1455 | ||
79c76d5b | 1456 | if (!nvlist_pack(label, &buf, &buflen, NV_ENCODE_XDR, KM_SLEEP)) { |
34dc7c2f | 1457 | for (; l < VDEV_LABELS; l += 2) { |
a6255b7f | 1458 | vdev_label_write(zio, vd, l, vp_abd, |
34dc7c2f BB |
1459 | offsetof(vdev_label_t, vl_vdev_phys), |
1460 | sizeof (vdev_phys_t), | |
7f96cc23 | 1461 | vdev_label_sync_done, good_writes, |
b128c09f | 1462 | flags | ZIO_FLAG_DONT_PROPAGATE); |
34dc7c2f BB |
1463 | } |
1464 | } | |
1465 | ||
a6255b7f | 1466 | abd_free(vp_abd); |
34dc7c2f BB |
1467 | nvlist_free(label); |
1468 | } | |
1469 | ||
1470 | int | |
b128c09f | 1471 | vdev_label_sync_list(spa_t *spa, int l, uint64_t txg, int flags) |
34dc7c2f | 1472 | { |
b128c09f | 1473 | list_t *dl = &spa->spa_config_dirty_list; |
34dc7c2f BB |
1474 | vdev_t *vd; |
1475 | zio_t *zio; | |
1476 | int error; | |
1477 | ||
1478 | /* | |
1479 | * Write the new labels to disk. | |
1480 | */ | |
1481 | zio = zio_root(spa, NULL, NULL, flags); | |
1482 | ||
1483 | for (vd = list_head(dl); vd != NULL; vd = list_next(dl, vd)) { | |
d6320ddb | 1484 | uint64_t *good_writes; |
428870ff BB |
1485 | |
1486 | ASSERT(!vd->vdev_ishole); | |
1487 | ||
79c76d5b | 1488 | good_writes = kmem_zalloc(sizeof (uint64_t), KM_SLEEP); |
1c27024e | 1489 | zio_t *vio = zio_null(zio, spa, NULL, |
b128c09f BB |
1490 | (vd->vdev_islog || vd->vdev_aux != NULL) ? |
1491 | vdev_label_sync_ignore_done : vdev_label_sync_top_done, | |
34dc7c2f | 1492 | good_writes, flags); |
7f96cc23 | 1493 | vdev_label_sync(vio, good_writes, vd, l, txg, flags); |
34dc7c2f BB |
1494 | zio_nowait(vio); |
1495 | } | |
1496 | ||
1497 | error = zio_wait(zio); | |
1498 | ||
1499 | /* | |
1500 | * Flush the new labels to disk. | |
1501 | */ | |
1502 | zio = zio_root(spa, NULL, NULL, flags); | |
1503 | ||
1504 | for (vd = list_head(dl); vd != NULL; vd = list_next(dl, vd)) | |
1505 | zio_flush(zio, vd); | |
1506 | ||
1507 | (void) zio_wait(zio); | |
1508 | ||
1509 | return (error); | |
1510 | } | |
1511 | ||
1512 | /* | |
1513 | * Sync the uberblock and any changes to the vdev configuration. | |
1514 | * | |
1515 | * The order of operations is carefully crafted to ensure that | |
1516 | * if the system panics or loses power at any time, the state on disk | |
1517 | * is still transactionally consistent. The in-line comments below | |
1518 | * describe the failure semantics at each stage. | |
1519 | * | |
1520 | * Moreover, vdev_config_sync() is designed to be idempotent: if it fails | |
1521 | * at any time, you can just call it again, and it will resume its work. | |
1522 | */ | |
1523 | int | |
b6fcb792 | 1524 | vdev_config_sync(vdev_t **svd, int svdcount, uint64_t txg) |
34dc7c2f BB |
1525 | { |
1526 | spa_t *spa = svd[0]->vdev_spa; | |
1527 | uberblock_t *ub = &spa->spa_uberblock; | |
1528 | vdev_t *vd; | |
1529 | zio_t *zio; | |
b6fcb792 | 1530 | int error = 0; |
b128c09f | 1531 | int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL; |
34dc7c2f | 1532 | |
b6fcb792 | 1533 | retry: |
9babb374 BB |
1534 | /* |
1535 | * Normally, we don't want to try too hard to write every label and | |
1536 | * uberblock. If there is a flaky disk, we don't want the rest of the | |
1537 | * sync process to block while we retry. But if we can't write a | |
1538 | * single label out, we should retry with ZIO_FLAG_TRYHARD before | |
1539 | * bailing out and declaring the pool faulted. | |
1540 | */ | |
b6fcb792 BB |
1541 | if (error != 0) { |
1542 | if ((flags & ZIO_FLAG_TRYHARD) != 0) | |
1543 | return (error); | |
9babb374 | 1544 | flags |= ZIO_FLAG_TRYHARD; |
b6fcb792 | 1545 | } |
9babb374 | 1546 | |
34dc7c2f BB |
1547 | ASSERT(ub->ub_txg <= txg); |
1548 | ||
1549 | /* | |
1550 | * If this isn't a resync due to I/O errors, | |
1551 | * and nothing changed in this transaction group, | |
1552 | * and the vdev configuration hasn't changed, | |
1553 | * then there's nothing to do. | |
1554 | */ | |
379ca9cf OF |
1555 | if (ub->ub_txg < txg) { |
1556 | boolean_t changed = uberblock_update(ub, spa->spa_root_vdev, | |
1557 | txg, spa->spa_mmp.mmp_delay); | |
1558 | ||
1559 | if (!changed && list_is_empty(&spa->spa_config_dirty_list)) | |
1560 | return (0); | |
1561 | } | |
34dc7c2f BB |
1562 | |
1563 | if (txg > spa_freeze_txg(spa)) | |
1564 | return (0); | |
1565 | ||
1566 | ASSERT(txg <= spa->spa_final_txg); | |
1567 | ||
1568 | /* | |
1569 | * Flush the write cache of every disk that's been written to | |
1570 | * in this transaction group. This ensures that all blocks | |
1571 | * written in this txg will be committed to stable storage | |
1572 | * before any uberblock that references them. | |
1573 | */ | |
1574 | zio = zio_root(spa, NULL, NULL, flags); | |
1575 | ||
1576 | for (vd = txg_list_head(&spa->spa_vdev_txg_list, TXG_CLEAN(txg)); vd; | |
1577 | vd = txg_list_next(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg))) | |
1578 | zio_flush(zio, vd); | |
1579 | ||
1580 | (void) zio_wait(zio); | |
1581 | ||
1582 | /* | |
1583 | * Sync out the even labels (L0, L2) for every dirty vdev. If the | |
1584 | * system dies in the middle of this process, that's OK: all of the | |
1585 | * even labels that made it to disk will be newer than any uberblock, | |
1586 | * and will therefore be considered invalid. The odd labels (L1, L3), | |
1587 | * which have not yet been touched, will still be valid. We flush | |
1588 | * the new labels to disk to ensure that all even-label updates | |
1589 | * are committed to stable storage before the uberblock update. | |
1590 | */ | |
b128c09f | 1591 | if ((error = vdev_label_sync_list(spa, 0, txg, flags)) != 0) |
b6fcb792 | 1592 | goto retry; |
34dc7c2f BB |
1593 | |
1594 | /* | |
1595 | * Sync the uberblocks to all vdevs in svd[]. | |
1596 | * If the system dies in the middle of this step, there are two cases | |
1597 | * to consider, and the on-disk state is consistent either way: | |
1598 | * | |
1599 | * (1) If none of the new uberblocks made it to disk, then the | |
1600 | * previous uberblock will be the newest, and the odd labels | |
1601 | * (which had not yet been touched) will be valid with respect | |
1602 | * to that uberblock. | |
1603 | * | |
1604 | * (2) If one or more new uberblocks made it to disk, then they | |
1605 | * will be the newest, and the even labels (which had all | |
1606 | * been successfully committed) will be valid with respect | |
1607 | * to the new uberblocks. | |
1608 | */ | |
1609 | if ((error = vdev_uberblock_sync_list(svd, svdcount, ub, flags)) != 0) | |
b6fcb792 | 1610 | goto retry; |
34dc7c2f | 1611 | |
379ca9cf OF |
1612 | if (spa_multihost(spa)) |
1613 | mmp_update_uberblock(spa, ub); | |
1614 | ||
34dc7c2f BB |
1615 | /* |
1616 | * Sync out odd labels for every dirty vdev. If the system dies | |
1617 | * in the middle of this process, the even labels and the new | |
1618 | * uberblocks will suffice to open the pool. The next time | |
1619 | * the pool is opened, the first thing we'll do -- before any | |
1620 | * user data is modified -- is mark every vdev dirty so that | |
1621 | * all labels will be brought up to date. We flush the new labels | |
1622 | * to disk to ensure that all odd-label updates are committed to | |
1623 | * stable storage before the next transaction group begins. | |
1624 | */ | |
b6fcb792 BB |
1625 | if ((error = vdev_label_sync_list(spa, 1, txg, flags)) != 0) |
1626 | goto retry; | |
1627 | ||
1628 | return (0); | |
34dc7c2f | 1629 | } |