Line data Source code
1 : /* SPDX-License-Identifier: BSD-3-Clause
2 : * Copyright (C) 2017 Intel Corporation.
3 : * All rights reserved.
4 : */
5 :
6 : /*
7 : * This is a module for test purpose which will simulate error cases for bdev.
8 : */
9 :
10 : #include "spdk/stdinc.h"
11 : #include "spdk/rpc.h"
12 : #include "spdk/util.h"
13 : #include "spdk/endian.h"
14 : #include "spdk/nvme_spec.h"
15 : #include "spdk/string.h"
16 :
17 : #include "spdk/bdev_module.h"
18 : #include "spdk/log.h"
19 :
20 : #include "vbdev_error.h"
21 :
22 : struct spdk_vbdev_error_config {
23 : char *base_bdev;
24 : struct spdk_uuid uuid;
25 : TAILQ_ENTRY(spdk_vbdev_error_config) tailq;
26 : };
27 :
28 : static TAILQ_HEAD(, spdk_vbdev_error_config) g_error_config
29 : = TAILQ_HEAD_INITIALIZER(g_error_config);
30 :
31 : struct vbdev_error_info {
32 : uint32_t error_type;
33 : uint32_t error_num;
34 : uint64_t error_qd;
35 : uint64_t corrupt_offset;
36 : uint8_t corrupt_value;
37 : };
38 :
39 : struct error_io {
40 : enum vbdev_error_type error_type;
41 : TAILQ_ENTRY(error_io) link;
42 : };
43 :
44 : /* Context for each error bdev */
45 : struct error_disk {
46 : struct spdk_bdev_part part;
47 : struct vbdev_error_info error_vector[SPDK_BDEV_IO_TYPE_RESET];
48 : };
49 :
50 : struct error_channel {
51 : struct spdk_bdev_part_channel part_ch;
52 : uint64_t io_inflight;
53 : TAILQ_HEAD(, error_io) pending_ios;
54 : };
55 :
56 : static pthread_mutex_t g_vbdev_error_mutex = PTHREAD_MUTEX_INITIALIZER;
57 : static SPDK_BDEV_PART_TAILQ g_error_disks = TAILQ_HEAD_INITIALIZER(g_error_disks);
58 :
59 : static int vbdev_error_init(void);
60 : static void vbdev_error_fini(void);
61 :
62 : static void vbdev_error_examine(struct spdk_bdev *bdev);
63 : static int vbdev_error_config_json(struct spdk_json_write_ctx *w);
64 :
65 : static int vbdev_error_config_add(const char *base_bdev_name, const struct spdk_uuid *uuid);
66 : static int vbdev_error_config_remove(const char *base_bdev_name);
67 :
68 : static int
69 0 : vbdev_error_get_ctx_size(void)
70 : {
71 0 : return sizeof(struct error_io);
72 : }
73 :
74 : static struct spdk_bdev_module error_if = {
75 : .name = "error",
76 : .module_init = vbdev_error_init,
77 : .module_fini = vbdev_error_fini,
78 : .examine_config = vbdev_error_examine,
79 : .config_json = vbdev_error_config_json,
80 : .get_ctx_size = vbdev_error_get_ctx_size,
81 :
82 : };
83 :
84 0 : SPDK_BDEV_MODULE_REGISTER(error, &error_if)
85 :
86 : static void
87 0 : dummy_bdev_event_cb(enum spdk_bdev_event_type type, struct spdk_bdev *bdev, void *ctx)
88 : {
89 0 : }
90 :
91 : int
92 0 : vbdev_error_inject_error(char *name, const struct vbdev_error_inject_opts *opts)
93 : {
94 : struct spdk_bdev_desc *desc;
95 : struct spdk_bdev *bdev;
96 : struct spdk_bdev_part *part;
97 0 : struct error_disk *error_disk = NULL;
98 : uint32_t i;
99 0 : int rc = 0;
100 :
101 0 : if (opts->error_type == VBDEV_IO_CORRUPT_DATA) {
102 0 : if (opts->corrupt_value == 0) {
103 : /* If corrupt_value is 0, XOR cannot cause data corruption. */
104 0 : SPDK_ERRLOG("corrupt_value should be non-zero.\n");
105 0 : return -EINVAL;
106 : }
107 0 : }
108 :
109 0 : pthread_mutex_lock(&g_vbdev_error_mutex);
110 :
111 0 : rc = spdk_bdev_open_ext(name, false, dummy_bdev_event_cb, NULL, &desc);
112 0 : if (rc != 0) {
113 0 : SPDK_ERRLOG("Could not open ErrorInjection bdev %s\n", name);
114 0 : pthread_mutex_unlock(&g_vbdev_error_mutex);
115 0 : return rc;
116 : }
117 :
118 0 : bdev = spdk_bdev_desc_get_bdev(desc);
119 :
120 0 : TAILQ_FOREACH(part, &g_error_disks, tailq) {
121 0 : if (bdev == spdk_bdev_part_get_bdev(part)) {
122 0 : error_disk = (struct error_disk *)part;
123 0 : break;
124 : }
125 0 : }
126 :
127 0 : if (error_disk == NULL) {
128 0 : SPDK_ERRLOG("Could not find ErrorInjection bdev %s\n", name);
129 0 : rc = -ENODEV;
130 0 : goto exit;
131 : }
132 :
133 0 : if (0xffffffff == opts->io_type) {
134 0 : for (i = 0; i < SPDK_COUNTOF(error_disk->error_vector); i++) {
135 0 : error_disk->error_vector[i].error_type = opts->error_type;
136 0 : error_disk->error_vector[i].error_num = opts->error_num;
137 0 : error_disk->error_vector[i].error_qd = opts->error_qd;
138 0 : error_disk->error_vector[i].corrupt_offset = opts->corrupt_offset;
139 0 : error_disk->error_vector[i].corrupt_value = opts->corrupt_value;
140 0 : }
141 0 : } else if (0 == opts->io_type) {
142 0 : for (i = 0; i < SPDK_COUNTOF(error_disk->error_vector); i++) {
143 0 : error_disk->error_vector[i].error_num = 0;
144 0 : }
145 0 : } else {
146 0 : error_disk->error_vector[opts->io_type].error_type = opts->error_type;
147 0 : error_disk->error_vector[opts->io_type].error_num = opts->error_num;
148 0 : error_disk->error_vector[opts->io_type].error_qd = opts->error_qd;
149 0 : error_disk->error_vector[opts->io_type].corrupt_offset = opts->corrupt_offset;
150 0 : error_disk->error_vector[opts->io_type].corrupt_value = opts->corrupt_value;
151 : }
152 :
153 : exit:
154 0 : spdk_bdev_close(desc);
155 0 : pthread_mutex_unlock(&g_vbdev_error_mutex);
156 0 : return rc;
157 0 : }
158 :
159 : static void
160 0 : vbdev_error_ch_abort_ios(struct spdk_io_channel_iter *i)
161 : {
162 0 : struct error_channel *ch = spdk_io_channel_get_ctx(spdk_io_channel_iter_get_channel(i));
163 : struct error_io *error_io, *tmp;
164 :
165 0 : TAILQ_FOREACH_SAFE(error_io, &ch->pending_ios, link, tmp) {
166 0 : TAILQ_REMOVE(&ch->pending_ios, error_io, link);
167 0 : spdk_bdev_io_complete(spdk_bdev_io_from_ctx(error_io), SPDK_BDEV_IO_STATUS_ABORTED);
168 0 : }
169 :
170 0 : spdk_for_each_channel_continue(i, 0);
171 0 : }
172 :
173 : static void
174 0 : vbdev_error_ch_abort_ios_done(struct spdk_io_channel_iter *i, int status)
175 : {
176 0 : struct spdk_bdev_io *reset_io = spdk_io_channel_iter_get_ctx(i);
177 :
178 0 : if (status != 0) {
179 0 : SPDK_ERRLOG("Failed to abort pending I/Os on bdev %s, status = %d\n",
180 : reset_io->bdev->name, status);
181 0 : spdk_bdev_io_complete(reset_io, SPDK_BDEV_IO_STATUS_FAILED);
182 0 : } else {
183 0 : spdk_bdev_io_complete(reset_io, SPDK_BDEV_IO_STATUS_SUCCESS);
184 : }
185 0 : }
186 :
187 : static void
188 0 : vbdev_error_reset(struct error_disk *error_disk, struct spdk_bdev_io *bdev_io)
189 : {
190 0 : spdk_for_each_channel(&error_disk->part, vbdev_error_ch_abort_ios, bdev_io,
191 : vbdev_error_ch_abort_ios_done);
192 0 : }
193 :
194 : static uint32_t
195 0 : vbdev_error_get_error_type(struct error_disk *error_disk, struct error_channel *ch,
196 : uint32_t io_type)
197 : {
198 : uint32_t error_num;
199 : struct vbdev_error_info *error_info;
200 :
201 0 : switch (io_type) {
202 : case SPDK_BDEV_IO_TYPE_READ:
203 : case SPDK_BDEV_IO_TYPE_WRITE:
204 : case SPDK_BDEV_IO_TYPE_UNMAP:
205 : case SPDK_BDEV_IO_TYPE_FLUSH:
206 0 : break;
207 : default:
208 0 : return VBDEV_IO_NO_ERROR;
209 : }
210 :
211 0 : error_info = &error_disk->error_vector[io_type];
212 :
213 0 : if (ch->io_inflight < error_info->error_qd) {
214 0 : return VBDEV_IO_NO_ERROR;
215 : }
216 :
217 0 : error_num = error_info->error_num;
218 0 : do {
219 0 : if (error_num == 0) {
220 0 : return VBDEV_IO_NO_ERROR;
221 : }
222 0 : } while (!__atomic_compare_exchange_n(&error_info->error_num,
223 0 : &error_num, error_num - 1,
224 : false, __ATOMIC_RELAXED, __ATOMIC_RELAXED));
225 :
226 0 : return error_info->error_type;
227 0 : }
228 :
229 : static void
230 0 : vbdev_error_corrupt_io_data(struct spdk_bdev_io *bdev_io, uint64_t corrupt_offset,
231 : uint8_t corrupt_value)
232 : {
233 : uint8_t *buf;
234 : int i;
235 :
236 0 : if (bdev_io->u.bdev.iovs == NULL || bdev_io->u.bdev.iovs[0].iov_base == NULL) {
237 0 : return;
238 : }
239 :
240 0 : for (i = 0; i < bdev_io->u.bdev.iovcnt; i++) {
241 0 : if (bdev_io->u.bdev.iovs[i].iov_len > corrupt_offset) {
242 0 : buf = (uint8_t *)bdev_io->u.bdev.iovs[i].iov_base;
243 :
244 0 : buf[corrupt_offset] ^= corrupt_value;
245 0 : break;
246 : }
247 :
248 0 : corrupt_offset -= bdev_io->u.bdev.iovs[i].iov_len;
249 0 : }
250 0 : }
251 :
252 : static void
253 0 : vbdev_error_complete_request(struct spdk_bdev_io *bdev_io, bool success, void *cb_arg)
254 : {
255 0 : struct error_io *error_io = (struct error_io *)bdev_io->driver_ctx;
256 0 : int status = success ? SPDK_BDEV_IO_STATUS_SUCCESS : SPDK_BDEV_IO_STATUS_FAILED;
257 0 : struct error_disk *error_disk = bdev_io->bdev->ctxt;
258 0 : struct error_channel *ch = spdk_io_channel_get_ctx(spdk_bdev_io_get_io_channel(bdev_io));
259 :
260 0 : assert(ch->io_inflight > 0);
261 0 : ch->io_inflight--;
262 :
263 0 : if (success && bdev_io->type == SPDK_BDEV_IO_TYPE_READ) {
264 0 : if (error_io->error_type == VBDEV_IO_CORRUPT_DATA) {
265 0 : vbdev_error_corrupt_io_data(bdev_io,
266 0 : error_disk->error_vector[bdev_io->type].corrupt_offset,
267 0 : error_disk->error_vector[bdev_io->type].corrupt_value);
268 0 : }
269 0 : }
270 :
271 0 : spdk_bdev_io_complete(bdev_io, status);
272 0 : }
273 :
274 : static void
275 0 : vbdev_error_submit_request(struct spdk_io_channel *_ch, struct spdk_bdev_io *bdev_io)
276 : {
277 0 : struct error_io *error_io = (struct error_io *)bdev_io->driver_ctx;
278 0 : struct error_channel *ch = spdk_io_channel_get_ctx(_ch);
279 0 : struct error_disk *error_disk = bdev_io->bdev->ctxt;
280 : int rc;
281 :
282 0 : if (bdev_io->type == SPDK_BDEV_IO_TYPE_RESET) {
283 0 : vbdev_error_reset(error_disk, bdev_io);
284 0 : return;
285 : }
286 :
287 0 : error_io->error_type = vbdev_error_get_error_type(error_disk, ch, bdev_io->type);
288 :
289 0 : switch (error_io->error_type) {
290 : case VBDEV_IO_FAILURE:
291 0 : spdk_bdev_io_complete(bdev_io, SPDK_BDEV_IO_STATUS_FAILED);
292 0 : break;
293 : case VBDEV_IO_NOMEM:
294 0 : spdk_bdev_io_complete(bdev_io, SPDK_BDEV_IO_STATUS_NOMEM);
295 0 : break;
296 : case VBDEV_IO_PENDING:
297 0 : TAILQ_INSERT_TAIL(&ch->pending_ios, error_io, link);
298 0 : break;
299 : case VBDEV_IO_CORRUPT_DATA:
300 0 : if (bdev_io->type == SPDK_BDEV_IO_TYPE_WRITE) {
301 0 : vbdev_error_corrupt_io_data(bdev_io,
302 0 : error_disk->error_vector[bdev_io->type].corrupt_offset,
303 0 : error_disk->error_vector[bdev_io->type].corrupt_value);
304 0 : }
305 : /* fallthrough */
306 : case VBDEV_IO_NO_ERROR:
307 0 : ch->io_inflight++;
308 0 : rc = spdk_bdev_part_submit_request_ext(&ch->part_ch, bdev_io,
309 : vbdev_error_complete_request);
310 :
311 0 : if (rc) {
312 0 : SPDK_ERRLOG("bdev_error: submit request failed, rc=%d\n", rc);
313 0 : spdk_bdev_io_complete(bdev_io, SPDK_BDEV_IO_STATUS_FAILED);
314 0 : ch->io_inflight--;
315 0 : }
316 0 : break;
317 : default:
318 0 : assert(false);
319 : break;
320 : }
321 0 : }
322 :
323 : static int
324 0 : vbdev_error_destruct(void *ctx)
325 : {
326 0 : struct error_disk *error_disk = ctx;
327 0 : struct spdk_bdev *base_bdev = spdk_bdev_part_get_base_bdev(&error_disk->part);
328 : int rc;
329 :
330 0 : rc = vbdev_error_config_remove(base_bdev->name);
331 0 : if (rc != 0) {
332 0 : SPDK_ERRLOG("vbdev_error_config_remove() failed\n");
333 0 : }
334 :
335 0 : return spdk_bdev_part_free(&error_disk->part);
336 : }
337 :
338 : static int
339 0 : vbdev_error_dump_info_json(void *ctx, struct spdk_json_write_ctx *w)
340 : {
341 0 : struct error_disk *error_disk = ctx;
342 0 : struct spdk_bdev *base_bdev = spdk_bdev_part_get_base_bdev(&error_disk->part);
343 :
344 0 : spdk_json_write_named_object_begin(w, "error_disk");
345 :
346 0 : spdk_json_write_named_string(w, "base_bdev", base_bdev->name);
347 :
348 0 : spdk_json_write_object_end(w);
349 :
350 0 : return 0;
351 : }
352 :
353 : static void
354 0 : vbdev_error_write_config_json(struct spdk_bdev *bdev, struct spdk_json_write_ctx *w)
355 : {
356 : /* No config per bdev. */
357 0 : }
358 :
359 :
360 : static struct spdk_bdev_fn_table vbdev_error_fn_table = {
361 : .destruct = vbdev_error_destruct,
362 : .submit_request = vbdev_error_submit_request,
363 : .dump_info_json = vbdev_error_dump_info_json,
364 : .write_config_json = vbdev_error_write_config_json
365 : };
366 :
367 : static void
368 0 : vbdev_error_base_bdev_hotremove_cb(void *_part_base)
369 : {
370 0 : struct spdk_bdev_part_base *part_base = _part_base;
371 :
372 0 : spdk_bdev_part_base_hotremove(part_base, &g_error_disks);
373 0 : }
374 :
375 : static int
376 0 : vbdev_error_ch_create_cb(void *io_device, void *ctx_buf)
377 : {
378 0 : struct error_channel *ch = ctx_buf;
379 :
380 0 : ch->io_inflight = 0;
381 0 : TAILQ_INIT(&ch->pending_ios);
382 :
383 0 : return 0;
384 : }
385 :
386 : static void
387 0 : vbdev_error_ch_destroy_cb(void *io_device, void *ctx_buf)
388 : {
389 0 : }
390 :
391 : static int
392 0 : _vbdev_error_create(const char *base_bdev_name, const struct spdk_uuid *uuid)
393 : {
394 0 : struct spdk_bdev_part_base *base = NULL;
395 0 : struct error_disk *disk = NULL;
396 : struct spdk_bdev *base_bdev, *bdev;
397 : char *name;
398 : int rc;
399 :
400 0 : rc = spdk_bdev_part_base_construct_ext(base_bdev_name,
401 : vbdev_error_base_bdev_hotremove_cb,
402 : &error_if, &vbdev_error_fn_table, &g_error_disks,
403 : NULL, NULL, sizeof(struct error_channel),
404 : vbdev_error_ch_create_cb, vbdev_error_ch_destroy_cb,
405 : &base);
406 0 : if (rc != 0) {
407 0 : if (rc != -ENODEV) {
408 0 : SPDK_ERRLOG("could not construct part base for bdev %s\n", base_bdev_name);
409 0 : }
410 0 : return rc;
411 : }
412 :
413 0 : base_bdev = spdk_bdev_part_base_get_bdev(base);
414 :
415 0 : disk = calloc(1, sizeof(*disk));
416 0 : if (!disk) {
417 0 : SPDK_ERRLOG("Memory allocation failure\n");
418 0 : spdk_bdev_part_base_free(base);
419 0 : return -ENOMEM;
420 : }
421 :
422 0 : name = spdk_sprintf_alloc("EE_%s", base_bdev_name);
423 0 : if (!name) {
424 0 : SPDK_ERRLOG("name allocation failure\n");
425 0 : spdk_bdev_part_base_free(base);
426 0 : free(disk);
427 0 : return -ENOMEM;
428 : }
429 :
430 0 : if (!spdk_uuid_is_null(uuid)) {
431 0 : bdev = spdk_bdev_part_get_bdev(&disk->part);
432 0 : spdk_uuid_copy(&bdev->uuid, uuid);
433 0 : }
434 :
435 0 : rc = spdk_bdev_part_construct(&disk->part, base, name, 0, base_bdev->blockcnt,
436 : "Error Injection Disk");
437 0 : free(name);
438 0 : if (rc) {
439 0 : SPDK_ERRLOG("could not construct part for bdev %s\n", base_bdev_name);
440 : /* spdk_bdev_part_construct will free name on failure */
441 0 : spdk_bdev_part_base_free(base);
442 0 : free(disk);
443 0 : return rc;
444 : }
445 :
446 0 : return 0;
447 0 : }
448 :
449 : int
450 0 : vbdev_error_create(const char *base_bdev_name, const struct spdk_uuid *uuid)
451 : {
452 : int rc;
453 :
454 0 : rc = vbdev_error_config_add(base_bdev_name, uuid);
455 0 : if (rc != 0) {
456 0 : SPDK_ERRLOG("Adding config for ErrorInjection bdev %s failed (rc=%d)\n",
457 : base_bdev_name, rc);
458 0 : return rc;
459 : }
460 :
461 0 : rc = _vbdev_error_create(base_bdev_name, uuid);
462 0 : if (rc == -ENODEV) {
463 0 : rc = 0;
464 0 : } else if (rc != 0) {
465 0 : vbdev_error_config_remove(base_bdev_name);
466 0 : SPDK_ERRLOG("Could not create ErrorInjection bdev %s (rc=%d)\n",
467 : base_bdev_name, rc);
468 0 : }
469 :
470 0 : return rc;
471 0 : }
472 :
473 : void
474 0 : vbdev_error_delete(const char *error_vbdev_name, spdk_delete_error_complete cb_fn, void *cb_arg)
475 : {
476 : int rc;
477 :
478 0 : rc = spdk_bdev_unregister_by_name(error_vbdev_name, &error_if, cb_fn, cb_arg);
479 0 : if (rc != 0) {
480 0 : cb_fn(cb_arg, rc);
481 0 : }
482 0 : }
483 :
484 : static void
485 0 : vbdev_error_clear_config(void)
486 : {
487 : struct spdk_vbdev_error_config *cfg;
488 :
489 0 : while ((cfg = TAILQ_FIRST(&g_error_config))) {
490 0 : TAILQ_REMOVE(&g_error_config, cfg, tailq);
491 0 : free(cfg->base_bdev);
492 0 : free(cfg);
493 : }
494 0 : }
495 :
496 : static struct spdk_vbdev_error_config *
497 0 : vbdev_error_config_find_by_base_name(const char *base_bdev_name)
498 : {
499 : struct spdk_vbdev_error_config *cfg;
500 :
501 0 : TAILQ_FOREACH(cfg, &g_error_config, tailq) {
502 0 : if (strcmp(cfg->base_bdev, base_bdev_name) == 0) {
503 0 : return cfg;
504 : }
505 0 : }
506 :
507 0 : return NULL;
508 0 : }
509 :
510 : static int
511 0 : vbdev_error_config_add(const char *base_bdev_name, const struct spdk_uuid *uuid)
512 : {
513 : struct spdk_vbdev_error_config *cfg;
514 :
515 0 : cfg = vbdev_error_config_find_by_base_name(base_bdev_name);
516 0 : if (cfg) {
517 0 : SPDK_ERRLOG("vbdev_error_config for bdev %s already exists\n",
518 : base_bdev_name);
519 0 : return -EEXIST;
520 : }
521 :
522 0 : cfg = calloc(1, sizeof(*cfg));
523 0 : if (!cfg) {
524 0 : SPDK_ERRLOG("calloc() failed for vbdev_error_config\n");
525 0 : return -ENOMEM;
526 : }
527 :
528 0 : cfg->base_bdev = strdup(base_bdev_name);
529 0 : if (!cfg->base_bdev) {
530 0 : free(cfg);
531 0 : SPDK_ERRLOG("strdup() failed for base_bdev_name\n");
532 0 : return -ENOMEM;
533 : }
534 :
535 0 : spdk_uuid_copy(&cfg->uuid, uuid);
536 0 : TAILQ_INSERT_TAIL(&g_error_config, cfg, tailq);
537 :
538 0 : return 0;
539 0 : }
540 :
541 : static int
542 0 : vbdev_error_config_remove(const char *base_bdev_name)
543 : {
544 : struct spdk_vbdev_error_config *cfg;
545 :
546 0 : cfg = vbdev_error_config_find_by_base_name(base_bdev_name);
547 0 : if (!cfg) {
548 0 : return -ENOENT;
549 : }
550 :
551 0 : TAILQ_REMOVE(&g_error_config, cfg, tailq);
552 0 : free(cfg->base_bdev);
553 0 : free(cfg);
554 0 : return 0;
555 0 : }
556 :
557 : static int
558 0 : vbdev_error_init(void)
559 : {
560 0 : return 0;
561 : }
562 :
563 : static void
564 0 : vbdev_error_fini(void)
565 : {
566 0 : vbdev_error_clear_config();
567 0 : }
568 :
569 : static void
570 0 : vbdev_error_examine(struct spdk_bdev *bdev)
571 : {
572 : struct spdk_vbdev_error_config *cfg;
573 : int rc;
574 :
575 0 : cfg = vbdev_error_config_find_by_base_name(bdev->name);
576 0 : if (cfg != NULL) {
577 0 : rc = _vbdev_error_create(bdev->name, &cfg->uuid);
578 0 : if (rc != 0) {
579 0 : SPDK_ERRLOG("could not create error vbdev for bdev %s at examine\n",
580 : bdev->name);
581 0 : }
582 0 : }
583 :
584 0 : spdk_bdev_module_examine_done(&error_if);
585 0 : }
586 :
587 : static int
588 0 : vbdev_error_config_json(struct spdk_json_write_ctx *w)
589 : {
590 : struct spdk_vbdev_error_config *cfg;
591 :
592 0 : TAILQ_FOREACH(cfg, &g_error_config, tailq) {
593 0 : spdk_json_write_object_begin(w);
594 :
595 0 : spdk_json_write_named_string(w, "method", "bdev_error_create");
596 0 : spdk_json_write_named_object_begin(w, "params");
597 0 : spdk_json_write_named_string(w, "base_name", cfg->base_bdev);
598 0 : if (!spdk_uuid_is_null(&cfg->uuid)) {
599 0 : spdk_json_write_named_uuid(w, "uuid", &cfg->uuid);
600 0 : }
601 0 : spdk_json_write_object_end(w);
602 :
603 0 : spdk_json_write_object_end(w);
604 0 : }
605 :
606 0 : return 0;
607 : }
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