LCOV - code coverage report
Current view: top level - module/bdev/error - vbdev_error.c (source / functions) Hit Total Coverage
Test: ut_cov_unit.info Lines: 0 252 0.0 %
Date: 2024-07-15 04:35:48 Functions: 0 24 0.0 %

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

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