LCOV - code coverage report
Current view: top level - lib/nvme - nvme_cuse.c (source / functions) Hit Total Coverage
Test: ut_cov_unit.info Lines: 200 720 27.8 %
Date: 2024-07-14 13:47:04 Functions: 16 46 34.8 %

          Line data    Source code
       1             : /*   SPDX-License-Identifier: BSD-3-Clause
       2             :  *   Copyright (C) 2019 Intel Corporation.
       3             :  *   All rights reserved.
       4             :  */
       5             : #include "spdk/stdinc.h"
       6             : #include "spdk/config.h"
       7             : #include "spdk/log.h"
       8             : #include "spdk/nvme.h"
       9             : 
      10             : #ifdef SPDK_CONFIG_NVME_CUSE
      11             : #define FUSE_USE_VERSION 31
      12             : 
      13             : #include <fuse3/cuse_lowlevel.h>
      14             : 
      15             : #include <linux/nvme_ioctl.h>
      16             : #include <linux/fs.h>
      17             : 
      18             : #include "nvme_internal.h"
      19             : #include "nvme_io_msg.h"
      20             : #include "nvme_cuse.h"
      21             : 
      22             : struct cuse_device {
      23             :         char                            dev_name[128];
      24             :         uint32_t                        index;
      25             :         int                             claim_fd;
      26             :         char                            lock_name[64];
      27             : 
      28             :         struct spdk_nvme_ctrlr          *ctrlr;         /**< NVMe controller */
      29             :         uint32_t                        nsid;           /**< NVMe name space id, or 0 */
      30             : 
      31             :         pthread_t                       tid;
      32             :         struct fuse_session             *session;
      33             : 
      34             :         struct cuse_device              *ctrlr_device;
      35             :         TAILQ_HEAD(, cuse_device)       ns_devices;
      36             : 
      37             :         TAILQ_ENTRY(cuse_device)        tailq;
      38             : };
      39             : 
      40             : static pthread_mutex_t g_cuse_mtx = PTHREAD_MUTEX_INITIALIZER;
      41             : static TAILQ_HEAD(, cuse_device) g_ctrlr_ctx_head = TAILQ_HEAD_INITIALIZER(g_ctrlr_ctx_head);
      42             : static struct spdk_bit_array *g_ctrlr_started;
      43             : 
      44             : struct cuse_io_ctx {
      45             :         struct spdk_nvme_cmd            nvme_cmd;
      46             :         enum spdk_nvme_data_transfer    data_transfer;
      47             : 
      48             :         uint64_t                        lba;
      49             :         uint32_t                        lba_count;
      50             :         uint16_t                        apptag;
      51             :         uint16_t                        appmask;
      52             : 
      53             :         void                            *data;
      54             :         void                            *metadata;
      55             : 
      56             :         int                             data_len;
      57             :         int                             metadata_len;
      58             : 
      59             :         fuse_req_t                      req;
      60             : };
      61             : 
      62             : static void
      63           8 : cuse_io_ctx_free(struct cuse_io_ctx *ctx)
      64             : {
      65           8 :         spdk_free(ctx->data);
      66           8 :         spdk_free(ctx->metadata);
      67           8 :         free(ctx);
      68           8 : }
      69             : 
      70             : #define FUSE_REPLY_CHECK_BUFFER(req, arg, out_bufsz, val)               \
      71             :         if (out_bufsz == 0) {                                           \
      72             :                 struct iovec out_iov;                                   \
      73             :                 out_iov.iov_base = (void *)arg;                         \
      74             :                 out_iov.iov_len = sizeof(val);                          \
      75             :                 fuse_reply_ioctl_retry(req, NULL, 0, &out_iov, 1);  \
      76             :                 return;                                                 \
      77             :         }
      78             : 
      79             : #define FUSE_MAX_SIZE 128*1024
      80             : 
      81             : static bool
      82           2 : fuse_check_req_size(fuse_req_t req, struct iovec iov[], int iovcnt)
      83             : {
      84           2 :         int total_iov_len = 0;
      85           5 :         for (int i = 0; i < iovcnt; i++) {
      86           3 :                 total_iov_len += iov[i].iov_len;
      87           3 :                 if (total_iov_len > FUSE_MAX_SIZE) {
      88           0 :                         fuse_reply_err(req, ENOMEM);
      89           0 :                         SPDK_ERRLOG("FUSE request cannot be larger that %d\n", FUSE_MAX_SIZE);
      90           0 :                         return false;
      91             :                 }
      92             :         }
      93           2 :         return true;
      94             : }
      95             : 
      96             : static void
      97           0 : cuse_nvme_passthru_cmd_cb(void *arg, const struct spdk_nvme_cpl *cpl)
      98             : {
      99           0 :         struct cuse_io_ctx *ctx = arg;
     100           0 :         struct iovec out_iov[3];
     101           0 :         struct spdk_nvme_cpl _cpl;
     102           0 :         int out_iovcnt = 0;
     103           0 :         uint16_t status_field = cpl->status_raw >> 1; /* Drop out phase bit */
     104             : 
     105           0 :         memcpy(&_cpl, cpl, sizeof(struct spdk_nvme_cpl));
     106           0 :         out_iov[out_iovcnt].iov_base = &_cpl.cdw0;
     107           0 :         out_iov[out_iovcnt].iov_len = sizeof(_cpl.cdw0);
     108           0 :         out_iovcnt += 1;
     109             : 
     110           0 :         if (ctx->data_transfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST) {
     111           0 :                 if (ctx->data_len > 0) {
     112           0 :                         out_iov[out_iovcnt].iov_base = ctx->data;
     113           0 :                         out_iov[out_iovcnt].iov_len = ctx->data_len;
     114           0 :                         out_iovcnt += 1;
     115             :                 }
     116           0 :                 if (ctx->metadata_len > 0) {
     117           0 :                         out_iov[out_iovcnt].iov_base = ctx->metadata;
     118           0 :                         out_iov[out_iovcnt].iov_len = ctx->metadata_len;
     119           0 :                         out_iovcnt += 1;
     120             :                 }
     121             :         }
     122             : 
     123           0 :         fuse_reply_ioctl_iov(ctx->req, status_field, out_iov, out_iovcnt);
     124           0 :         cuse_io_ctx_free(ctx);
     125           0 : }
     126             : 
     127             : static void
     128           0 : cuse_nvme_passthru_cmd_execute(struct spdk_nvme_ctrlr *ctrlr, uint32_t nsid, void *arg)
     129             : {
     130             :         int rc;
     131           0 :         struct cuse_io_ctx *ctx = arg;
     132             : 
     133           0 :         if (nsid != 0) {
     134           0 :                 rc = spdk_nvme_ctrlr_cmd_io_raw_with_md(ctrlr, ctrlr->external_io_msgs_qpair, &ctx->nvme_cmd,
     135             :                                                         ctx->data,
     136           0 :                                                         ctx->data_len, ctx->metadata, cuse_nvme_passthru_cmd_cb, (void *)ctx);
     137             :         } else {
     138           0 :                 rc = spdk_nvme_ctrlr_cmd_admin_raw(ctrlr, &ctx->nvme_cmd, ctx->data, ctx->data_len,
     139             :                                                    cuse_nvme_passthru_cmd_cb, (void *)ctx);
     140             :         }
     141           0 :         if (rc < 0) {
     142           0 :                 fuse_reply_err(ctx->req, EINVAL);
     143           0 :                 cuse_io_ctx_free(ctx);
     144             :         }
     145           0 : }
     146             : 
     147             : static void
     148           2 : cuse_nvme_passthru_cmd_send(fuse_req_t req, struct nvme_passthru_cmd *passthru_cmd,
     149             :                             const void *data, const void *metadata, int cmd)
     150             : {
     151             :         struct cuse_io_ctx *ctx;
     152           2 :         struct cuse_device *cuse_device = fuse_req_userdata(req);
     153             :         int rv;
     154             : 
     155           2 :         ctx = (struct cuse_io_ctx *)calloc(1, sizeof(struct cuse_io_ctx));
     156           2 :         if (!ctx) {
     157           0 :                 SPDK_ERRLOG("Cannot allocate memory for cuse_io_ctx\n");
     158           0 :                 fuse_reply_err(req, ENOMEM);
     159           0 :                 return;
     160             :         }
     161             : 
     162           2 :         ctx->req = req;
     163           2 :         ctx->data_transfer = spdk_nvme_opc_get_data_transfer(passthru_cmd->opcode);
     164             : 
     165           2 :         memset(&ctx->nvme_cmd, 0, sizeof(ctx->nvme_cmd));
     166           2 :         ctx->nvme_cmd.opc = passthru_cmd->opcode;
     167           2 :         ctx->nvme_cmd.nsid = passthru_cmd->nsid;
     168           2 :         ctx->nvme_cmd.cdw10 = passthru_cmd->cdw10;
     169           2 :         ctx->nvme_cmd.cdw11 = passthru_cmd->cdw11;
     170           2 :         ctx->nvme_cmd.cdw12 = passthru_cmd->cdw12;
     171           2 :         ctx->nvme_cmd.cdw13 = passthru_cmd->cdw13;
     172           2 :         ctx->nvme_cmd.cdw14 = passthru_cmd->cdw14;
     173           2 :         ctx->nvme_cmd.cdw15 = passthru_cmd->cdw15;
     174             : 
     175           2 :         ctx->data_len = passthru_cmd->data_len;
     176           2 :         ctx->metadata_len = passthru_cmd->metadata_len;
     177             : 
     178           2 :         if (ctx->data_len > 0) {
     179           2 :                 ctx->data = spdk_malloc(ctx->data_len, 4096, NULL, SPDK_ENV_LCORE_ID_ANY, SPDK_MALLOC_DMA);
     180           2 :                 if (!ctx->data) {
     181           0 :                         SPDK_ERRLOG("Cannot allocate memory for data\n");
     182           0 :                         fuse_reply_err(req, ENOMEM);
     183           0 :                         free(ctx);
     184           0 :                         return;
     185             :                 }
     186           2 :                 if (data != NULL) {
     187           0 :                         memcpy(ctx->data, data, ctx->data_len);
     188             :                 }
     189             :         }
     190             : 
     191           2 :         if (ctx->metadata_len > 0) {
     192           1 :                 ctx->metadata = spdk_malloc(ctx->metadata_len, 4096, NULL, SPDK_ENV_LCORE_ID_ANY, SPDK_MALLOC_DMA);
     193           1 :                 if (!ctx->metadata) {
     194           0 :                         SPDK_ERRLOG("Cannot allocate memory for metadata\n");
     195           0 :                         fuse_reply_err(req, ENOMEM);
     196           0 :                         cuse_io_ctx_free(ctx);
     197           0 :                         return;
     198             :                 }
     199           1 :                 if (metadata != NULL) {
     200           0 :                         memcpy(ctx->metadata, metadata, ctx->metadata_len);
     201             :                 }
     202             :         }
     203             : 
     204           2 :         if ((unsigned int)cmd != NVME_IOCTL_ADMIN_CMD) {
     205             :                 /* Send NS for IO IOCTLs */
     206           2 :                 rv = nvme_io_msg_send(cuse_device->ctrlr, passthru_cmd->nsid, cuse_nvme_passthru_cmd_execute, ctx);
     207             :         } else {
     208             :                 /* NS == 0 for Admin IOCTLs */
     209           0 :                 rv = nvme_io_msg_send(cuse_device->ctrlr, 0, cuse_nvme_passthru_cmd_execute, ctx);
     210             :         }
     211           2 :         if (rv) {
     212           0 :                 SPDK_ERRLOG("Cannot send io msg to the controller\n");
     213           0 :                 fuse_reply_err(req, -rv);
     214           0 :                 cuse_io_ctx_free(ctx);
     215           0 :                 return;
     216             :         }
     217             : }
     218             : 
     219             : static void
     220           0 : cuse_nvme_passthru_cmd(fuse_req_t req, int cmd, void *arg,
     221             :                        struct fuse_file_info *fi, unsigned flags,
     222             :                        const void *in_buf, size_t in_bufsz, size_t out_bufsz)
     223             : {
     224             :         struct nvme_passthru_cmd *passthru_cmd;
     225           0 :         struct iovec in_iov[3], out_iov[3];
     226           0 :         int in_iovcnt = 0, out_iovcnt = 0;
     227           0 :         const void *dptr = NULL, *mdptr = NULL;
     228             :         enum spdk_nvme_data_transfer data_transfer;
     229             : 
     230           0 :         in_iov[in_iovcnt].iov_base = (void *)arg;
     231           0 :         in_iov[in_iovcnt].iov_len = sizeof(*passthru_cmd);
     232           0 :         in_iovcnt += 1;
     233           0 :         if (in_bufsz == 0) {
     234           0 :                 fuse_reply_ioctl_retry(req, in_iov, in_iovcnt, NULL, out_iovcnt);
     235           0 :                 return;
     236             :         }
     237             : 
     238           0 :         passthru_cmd = (struct nvme_passthru_cmd *)in_buf;
     239           0 :         data_transfer = spdk_nvme_opc_get_data_transfer(passthru_cmd->opcode);
     240             : 
     241           0 :         if (data_transfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER) {
     242             :                 /* Make data pointer accessible (RO) */
     243           0 :                 if (passthru_cmd->addr != 0) {
     244           0 :                         in_iov[in_iovcnt].iov_base = (void *)passthru_cmd->addr;
     245           0 :                         in_iov[in_iovcnt].iov_len = passthru_cmd->data_len;
     246           0 :                         in_iovcnt += 1;
     247             :                 }
     248             :                 /* Make metadata pointer accessible (RO) */
     249           0 :                 if (passthru_cmd->metadata != 0) {
     250           0 :                         in_iov[in_iovcnt].iov_base = (void *)passthru_cmd->metadata;
     251           0 :                         in_iov[in_iovcnt].iov_len = passthru_cmd->metadata_len;
     252           0 :                         in_iovcnt += 1;
     253             :                 }
     254             :         }
     255             : 
     256           0 :         if (!fuse_check_req_size(req, in_iov, in_iovcnt)) {
     257           0 :                 return;
     258             :         }
     259             :         /* Always make result field writeable regardless of data transfer bits */
     260           0 :         out_iov[out_iovcnt].iov_base = &((struct nvme_passthru_cmd *)arg)->result;
     261           0 :         out_iov[out_iovcnt].iov_len = sizeof(uint32_t);
     262           0 :         out_iovcnt += 1;
     263             : 
     264           0 :         if (data_transfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST) {
     265             :                 /* Make data pointer accessible (WO) */
     266           0 :                 if (passthru_cmd->data_len > 0) {
     267           0 :                         out_iov[out_iovcnt].iov_base = (void *)passthru_cmd->addr;
     268           0 :                         out_iov[out_iovcnt].iov_len = passthru_cmd->data_len;
     269           0 :                         out_iovcnt += 1;
     270             :                 }
     271             :                 /* Make metadata pointer accessible (WO) */
     272           0 :                 if (passthru_cmd->metadata_len > 0) {
     273           0 :                         out_iov[out_iovcnt].iov_base = (void *)passthru_cmd->metadata;
     274           0 :                         out_iov[out_iovcnt].iov_len = passthru_cmd->metadata_len;
     275           0 :                         out_iovcnt += 1;
     276             :                 }
     277             :         }
     278             : 
     279           0 :         if (!fuse_check_req_size(req, out_iov, out_iovcnt)) {
     280           0 :                 return;
     281             :         }
     282             : 
     283           0 :         if (out_bufsz == 0) {
     284           0 :                 fuse_reply_ioctl_retry(req, in_iov, in_iovcnt, out_iov, out_iovcnt);
     285           0 :                 return;
     286             :         }
     287             : 
     288           0 :         if (data_transfer == SPDK_NVME_DATA_BIDIRECTIONAL) {
     289           0 :                 fuse_reply_err(req, EINVAL);
     290           0 :                 return;
     291             :         }
     292             : 
     293           0 :         if (data_transfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER) {
     294           0 :                 dptr = (passthru_cmd->addr == 0) ? NULL : (uint8_t *)in_buf + sizeof(*passthru_cmd);
     295           0 :                 mdptr = (passthru_cmd->metadata == 0) ? NULL : (uint8_t *)in_buf + sizeof(*passthru_cmd) +
     296           0 :                         passthru_cmd->data_len;
     297             :         }
     298             : 
     299           0 :         cuse_nvme_passthru_cmd_send(req, passthru_cmd, dptr, mdptr, cmd);
     300             : }
     301             : 
     302             : static void
     303           0 : cuse_nvme_reset_execute(struct spdk_nvme_ctrlr *ctrlr, uint32_t nsid, void *arg)
     304             : {
     305             :         int rc;
     306           0 :         fuse_req_t req = arg;
     307             : 
     308           0 :         rc = spdk_nvme_ctrlr_reset(ctrlr);
     309           0 :         if (rc) {
     310           0 :                 fuse_reply_err(req, rc);
     311           0 :                 return;
     312             :         }
     313             : 
     314           0 :         fuse_reply_ioctl_iov(req, 0, NULL, 0);
     315             : }
     316             : 
     317             : static void
     318           0 : cuse_nvme_subsys_reset_execute(struct spdk_nvme_ctrlr *ctrlr, uint32_t nsid, void *arg)
     319             : {
     320             :         int rc;
     321           0 :         fuse_req_t req = arg;
     322             : 
     323           0 :         rc = spdk_nvme_ctrlr_reset_subsystem(ctrlr);
     324           0 :         if (rc) {
     325           0 :                 fuse_reply_err(req, rc);
     326           0 :                 return;
     327             :         }
     328             : 
     329           0 :         fuse_reply_ioctl_iov(req, 0, NULL, 0);
     330             : }
     331             : 
     332             : static void
     333           2 : cuse_nvme_reset(fuse_req_t req, int cmd, void *arg,
     334             :                 struct fuse_file_info *fi, unsigned flags,
     335             :                 const void *in_buf, size_t in_bufsz, size_t out_bufsz)
     336             : {
     337             :         int rv;
     338           2 :         struct cuse_device *cuse_device = fuse_req_userdata(req);
     339             : 
     340           2 :         if (cuse_device->nsid) {
     341           1 :                 SPDK_ERRLOG("Namespace reset not supported\n");
     342           1 :                 fuse_reply_err(req, EINVAL);
     343           1 :                 return;
     344             :         }
     345             : 
     346           1 :         if (cmd == NVME_IOCTL_SUBSYS_RESET) {
     347           0 :                 SPDK_DEBUGLOG(nvme_cuse, "NVME_IOCTL_SUBSYS_RESET\n");
     348           0 :                 rv = nvme_io_msg_send(cuse_device->ctrlr, cuse_device->nsid, cuse_nvme_subsys_reset_execute,
     349             :                                       (void *)req);
     350             :         } else {
     351           1 :                 SPDK_DEBUGLOG(nvme_cuse, "NVME_IOCTL_RESET\n");
     352           1 :                 rv = nvme_io_msg_send(cuse_device->ctrlr, cuse_device->nsid, cuse_nvme_reset_execute, (void *)req);
     353             :         }
     354           1 :         if (rv) {
     355           0 :                 SPDK_ERRLOG("Cannot send reset\n");
     356           0 :                 fuse_reply_err(req, EINVAL);
     357             :         }
     358             : }
     359             : 
     360             : static void
     361           0 : cuse_nvme_rescan_execute(struct spdk_nvme_ctrlr *ctrlr, uint32_t nsid, void *arg)
     362             : {
     363           0 :         fuse_req_t req = arg;
     364             : 
     365           0 :         nvme_ctrlr_update_namespaces(ctrlr);
     366           0 :         fuse_reply_ioctl_iov(req, 0, NULL, 0);
     367           0 : }
     368             : 
     369             : static void
     370           0 : cuse_nvme_rescan(fuse_req_t req, int cmd, void *arg,
     371             :                  struct fuse_file_info *fi, unsigned flags,
     372             :                  const void *in_buf, size_t in_bufsz, size_t out_bufsz)
     373             : {
     374             :         int rv;
     375           0 :         struct cuse_device *cuse_device = fuse_req_userdata(req);
     376             : 
     377           0 :         if (cuse_device->nsid) {
     378           0 :                 SPDK_ERRLOG("Namespace rescan not supported\n");
     379           0 :                 fuse_reply_err(req, EINVAL);
     380           0 :                 return;
     381             :         }
     382             : 
     383           0 :         rv = nvme_io_msg_send(cuse_device->ctrlr, cuse_device->nsid, cuse_nvme_rescan_execute, (void *)req);
     384           0 :         if (rv) {
     385           0 :                 SPDK_ERRLOG("Cannot send rescan\n");
     386           0 :                 fuse_reply_err(req, EINVAL);
     387             :         }
     388             : }
     389             : 
     390             : /*****************************************************************************
     391             :  * Namespace IO requests
     392             :  */
     393             : 
     394             : static void
     395           0 : cuse_nvme_submit_io_write_done(void *ref, const struct spdk_nvme_cpl *cpl)
     396             : {
     397           0 :         struct cuse_io_ctx *ctx = (struct cuse_io_ctx *)ref;
     398           0 :         uint16_t status_field = cpl->status_raw >> 1; /* Drop out phase bit */
     399             : 
     400           0 :         fuse_reply_ioctl_iov(ctx->req, status_field, NULL, 0);
     401             : 
     402           0 :         cuse_io_ctx_free(ctx);
     403           0 : }
     404             : 
     405             : static void
     406           0 : cuse_nvme_submit_io_write_cb(struct spdk_nvme_ctrlr *ctrlr, uint32_t nsid, void *arg)
     407             : {
     408             :         int rc;
     409           0 :         struct cuse_io_ctx *ctx = arg;
     410           0 :         struct spdk_nvme_ns *ns = spdk_nvme_ctrlr_get_ns(ctrlr, nsid);
     411             : 
     412           0 :         rc = spdk_nvme_ns_cmd_write_with_md(ns, ctrlr->external_io_msgs_qpair, ctx->data, ctx->metadata,
     413             :                                             ctx->lba, /* LBA start */
     414             :                                             ctx->lba_count, /* number of LBAs */
     415             :                                             cuse_nvme_submit_io_write_done, ctx, 0,
     416           0 :                                             ctx->appmask, ctx->apptag);
     417             : 
     418           0 :         if (rc != 0) {
     419           0 :                 SPDK_ERRLOG("write failed: rc = %d\n", rc);
     420           0 :                 fuse_reply_err(ctx->req, rc);
     421           0 :                 cuse_io_ctx_free(ctx);
     422           0 :                 return;
     423             :         }
     424             : }
     425             : 
     426             : static void
     427           3 : cuse_nvme_submit_io_write(struct cuse_device *cuse_device, fuse_req_t req, int cmd, void *arg,
     428             :                           struct fuse_file_info *fi, unsigned flags, uint32_t block_size, uint32_t md_size,
     429             :                           const void *in_buf, size_t in_bufsz, size_t out_bufsz)
     430             : {
     431           3 :         const struct nvme_user_io *user_io = in_buf;
     432             :         struct cuse_io_ctx *ctx;
     433             :         int rc;
     434             : 
     435           3 :         ctx = (struct cuse_io_ctx *)calloc(1, sizeof(struct cuse_io_ctx));
     436           3 :         if (!ctx) {
     437           0 :                 SPDK_ERRLOG("Cannot allocate memory for context\n");
     438           0 :                 fuse_reply_err(req, ENOMEM);
     439           0 :                 return;
     440             :         }
     441             : 
     442           3 :         ctx->req = req;
     443           3 :         ctx->lba = user_io->slba;
     444           3 :         ctx->lba_count = user_io->nblocks + 1;
     445           3 :         ctx->data_len = ctx->lba_count * block_size;
     446             : 
     447           3 :         ctx->data = spdk_zmalloc(ctx->data_len, 0x1000, NULL, SPDK_ENV_SOCKET_ID_ANY,
     448             :                                  SPDK_MALLOC_DMA);
     449           3 :         if (ctx->data == NULL) {
     450           0 :                 SPDK_ERRLOG("Write buffer allocation failed\n");
     451           0 :                 fuse_reply_err(ctx->req, ENOMEM);
     452           0 :                 free(ctx);
     453           0 :                 return;
     454             :         }
     455             : 
     456           3 :         memcpy(ctx->data, (uint8_t *)in_buf + sizeof(*user_io), ctx->data_len);
     457             : 
     458           3 :         if (user_io->metadata) {
     459           1 :                 ctx->apptag = user_io->apptag;
     460           1 :                 ctx->appmask = user_io->appmask;
     461           1 :                 ctx->metadata_len = md_size * ctx->lba_count;
     462           1 :                 ctx->metadata = spdk_zmalloc(ctx->metadata_len, 4096, NULL, SPDK_ENV_LCORE_ID_ANY, SPDK_MALLOC_DMA);
     463             : 
     464           1 :                 if (ctx->metadata == NULL) {
     465           0 :                         SPDK_ERRLOG("Cannot allocate memory for metadata\n");
     466           0 :                         if (ctx->metadata_len == 0) {
     467           0 :                                 SPDK_ERRLOG("Device format does not support metadata\n");
     468             :                         }
     469           0 :                         fuse_reply_err(req, ENOMEM);
     470           0 :                         cuse_io_ctx_free(ctx);
     471           0 :                         return;
     472             :                 }
     473             : 
     474           1 :                 memcpy(ctx->metadata, (uint8_t *)in_buf + sizeof(*user_io) + ctx->data_len,
     475           1 :                        ctx->metadata_len);
     476             :         }
     477             : 
     478           3 :         rc = nvme_io_msg_send(cuse_device->ctrlr, cuse_device->nsid, cuse_nvme_submit_io_write_cb,
     479             :                               ctx);
     480           3 :         if (rc < 0) {
     481           0 :                 SPDK_ERRLOG("Cannot send write io\n");
     482           0 :                 fuse_reply_err(ctx->req, rc);
     483           0 :                 cuse_io_ctx_free(ctx);
     484             :         }
     485             : }
     486             : 
     487             : static void
     488           0 : cuse_nvme_submit_io_read_done(void *ref, const struct spdk_nvme_cpl *cpl)
     489             : {
     490           0 :         struct cuse_io_ctx *ctx = (struct cuse_io_ctx *)ref;
     491           0 :         struct iovec iov[2];
     492           0 :         int iovcnt = 0;
     493           0 :         uint16_t status_field = cpl->status_raw >> 1; /* Drop out phase bit */
     494             : 
     495           0 :         iov[iovcnt].iov_base = ctx->data;
     496           0 :         iov[iovcnt].iov_len = ctx->data_len;
     497           0 :         iovcnt += 1;
     498             : 
     499           0 :         if (ctx->metadata) {
     500           0 :                 iov[iovcnt].iov_base = ctx->metadata;
     501           0 :                 iov[iovcnt].iov_len = ctx->metadata_len;
     502           0 :                 iovcnt += 1;
     503             :         }
     504             : 
     505           0 :         fuse_reply_ioctl_iov(ctx->req, status_field, iov, iovcnt);
     506             : 
     507           0 :         cuse_io_ctx_free(ctx);
     508           0 : }
     509             : 
     510             : static void
     511           0 : cuse_nvme_submit_io_read_cb(struct spdk_nvme_ctrlr *ctrlr, uint32_t nsid, void *arg)
     512             : {
     513             :         int rc;
     514           0 :         struct cuse_io_ctx *ctx = arg;
     515           0 :         struct spdk_nvme_ns *ns = spdk_nvme_ctrlr_get_ns(ctrlr, nsid);
     516             : 
     517           0 :         rc = spdk_nvme_ns_cmd_read_with_md(ns, ctrlr->external_io_msgs_qpair, ctx->data, ctx->metadata,
     518             :                                            ctx->lba, /* LBA start */
     519             :                                            ctx->lba_count, /* number of LBAs */
     520             :                                            cuse_nvme_submit_io_read_done, ctx, 0,
     521           0 :                                            ctx->appmask, ctx->apptag);
     522             : 
     523           0 :         if (rc != 0) {
     524           0 :                 SPDK_ERRLOG("read failed: rc = %d\n", rc);
     525           0 :                 fuse_reply_err(ctx->req, rc);
     526           0 :                 cuse_io_ctx_free(ctx);
     527           0 :                 return;
     528             :         }
     529             : }
     530             : 
     531             : static void
     532           3 : cuse_nvme_submit_io_read(struct cuse_device *cuse_device, fuse_req_t req, int cmd, void *arg,
     533             :                          struct fuse_file_info *fi, unsigned flags, uint32_t block_size, uint32_t md_size,
     534             :                          const void *in_buf, size_t in_bufsz, size_t out_bufsz)
     535             : {
     536             :         int rc;
     537             :         struct cuse_io_ctx *ctx;
     538           3 :         const struct nvme_user_io *user_io = in_buf;
     539             : 
     540           3 :         ctx = (struct cuse_io_ctx *)calloc(1, sizeof(struct cuse_io_ctx));
     541           3 :         if (!ctx) {
     542           0 :                 SPDK_ERRLOG("Cannot allocate memory for context\n");
     543           0 :                 fuse_reply_err(req, ENOMEM);
     544           0 :                 return;
     545             :         }
     546             : 
     547           3 :         ctx->req = req;
     548           3 :         ctx->lba = user_io->slba;
     549           3 :         ctx->lba_count = user_io->nblocks + 1;
     550             : 
     551           3 :         ctx->data_len = ctx->lba_count * block_size;
     552           3 :         ctx->data = spdk_zmalloc(ctx->data_len, 0x1000, NULL, SPDK_ENV_SOCKET_ID_ANY,
     553             :                                  SPDK_MALLOC_DMA);
     554           3 :         if (ctx->data == NULL) {
     555           0 :                 SPDK_ERRLOG("Read buffer allocation failed\n");
     556           0 :                 fuse_reply_err(ctx->req, ENOMEM);
     557           0 :                 free(ctx);
     558           0 :                 return;
     559             :         }
     560             : 
     561           3 :         if (user_io->metadata) {
     562           1 :                 ctx->apptag = user_io->apptag;
     563           1 :                 ctx->appmask = user_io->appmask;
     564           1 :                 ctx->metadata_len = md_size * ctx->lba_count;
     565           1 :                 ctx->metadata = spdk_zmalloc(ctx->metadata_len, 4096, NULL, SPDK_ENV_LCORE_ID_ANY, SPDK_MALLOC_DMA);
     566             : 
     567           1 :                 if (ctx->metadata == NULL) {
     568           0 :                         SPDK_ERRLOG("Cannot allocate memory for metadata\n");
     569           0 :                         if (ctx->metadata_len == 0) {
     570           0 :                                 SPDK_ERRLOG("Device format does not support metadata\n");
     571             :                         }
     572           0 :                         fuse_reply_err(req, ENOMEM);
     573           0 :                         cuse_io_ctx_free(ctx);
     574           0 :                         return;
     575             :                 }
     576             :         }
     577             : 
     578           3 :         rc = nvme_io_msg_send(cuse_device->ctrlr, cuse_device->nsid, cuse_nvme_submit_io_read_cb, ctx);
     579           3 :         if (rc < 0) {
     580           0 :                 SPDK_ERRLOG("Cannot send read io\n");
     581           0 :                 fuse_reply_err(ctx->req, rc);
     582           0 :                 cuse_io_ctx_free(ctx);
     583             :         }
     584             : }
     585             : 
     586             : 
     587             : static void
     588           3 : cuse_nvme_submit_io(fuse_req_t req, int cmd, void *arg,
     589             :                     struct fuse_file_info *fi, unsigned flags,
     590             :                     const void *in_buf, size_t in_bufsz, size_t out_bufsz)
     591             : {
     592             :         const struct nvme_user_io *user_io;
     593           3 :         struct iovec in_iov[3], out_iov[2];
     594           3 :         int in_iovcnt = 0, out_iovcnt = 0;
     595           3 :         struct cuse_device *cuse_device = fuse_req_userdata(req);
     596             :         struct spdk_nvme_ns *ns;
     597             :         uint32_t block_size;
     598             :         uint32_t md_size;
     599             : 
     600           3 :         in_iov[in_iovcnt].iov_base = (void *)arg;
     601           3 :         in_iov[in_iovcnt].iov_len = sizeof(*user_io);
     602           3 :         in_iovcnt += 1;
     603           3 :         if (in_bufsz == 0) {
     604           0 :                 fuse_reply_ioctl_retry(req, in_iov, in_iovcnt, NULL, 0);
     605           0 :                 return;
     606             :         }
     607             : 
     608           3 :         user_io = in_buf;
     609             : 
     610           3 :         ns = spdk_nvme_ctrlr_get_ns(cuse_device->ctrlr, cuse_device->nsid);
     611           3 :         block_size = spdk_nvme_ns_get_sector_size(ns);
     612           3 :         md_size = spdk_nvme_ns_get_md_size(ns);
     613             : 
     614           3 :         switch (user_io->opcode) {
     615           1 :         case SPDK_NVME_OPC_READ:
     616           1 :                 out_iov[out_iovcnt].iov_base = (void *)user_io->addr;
     617           1 :                 out_iov[out_iovcnt].iov_len = (user_io->nblocks + 1) * block_size;
     618           1 :                 out_iovcnt += 1;
     619           1 :                 if (user_io->metadata != 0) {
     620           0 :                         out_iov[out_iovcnt].iov_base = (void *)user_io->metadata;
     621           0 :                         out_iov[out_iovcnt].iov_len = (user_io->nblocks + 1) * md_size;
     622           0 :                         out_iovcnt += 1;
     623             :                 }
     624           1 :                 if (!fuse_check_req_size(req, out_iov, out_iovcnt)) {
     625           0 :                         return;
     626             :                 }
     627           1 :                 if (out_bufsz == 0) {
     628           0 :                         fuse_reply_ioctl_retry(req, in_iov, in_iovcnt, out_iov, out_iovcnt);
     629           0 :                         return;
     630             :                 }
     631             : 
     632           1 :                 cuse_nvme_submit_io_read(cuse_device, req, cmd, arg, fi, flags,
     633             :                                          block_size, md_size, in_buf, in_bufsz, out_bufsz);
     634           1 :                 break;
     635           1 :         case SPDK_NVME_OPC_WRITE:
     636           1 :                 in_iov[in_iovcnt].iov_base = (void *)user_io->addr;
     637           1 :                 in_iov[in_iovcnt].iov_len = (user_io->nblocks + 1) * block_size;
     638           1 :                 in_iovcnt += 1;
     639           1 :                 if (user_io->metadata != 0) {
     640           0 :                         in_iov[in_iovcnt].iov_base = (void *)user_io->metadata;
     641           0 :                         in_iov[in_iovcnt].iov_len = (user_io->nblocks + 1) * md_size;
     642           0 :                         in_iovcnt += 1;
     643             :                 }
     644           1 :                 if (!fuse_check_req_size(req, in_iov, in_iovcnt)) {
     645           0 :                         return;
     646             :                 }
     647           1 :                 if (in_bufsz == sizeof(*user_io)) {
     648           0 :                         fuse_reply_ioctl_retry(req, in_iov, in_iovcnt, NULL, out_iovcnt);
     649           0 :                         return;
     650             :                 }
     651             : 
     652           1 :                 cuse_nvme_submit_io_write(cuse_device, req, cmd, arg, fi, flags,
     653             :                                           block_size, md_size, in_buf, in_bufsz, out_bufsz);
     654           1 :                 break;
     655           1 :         default:
     656           1 :                 SPDK_ERRLOG("SUBMIT_IO: opc:%d not valid\n", user_io->opcode);
     657           1 :                 fuse_reply_err(req, EINVAL);
     658           1 :                 return;
     659             :         }
     660             : 
     661             : }
     662             : 
     663             : /*****************************************************************************
     664             :  * Other namespace IOCTLs
     665             :  */
     666             : static void
     667           0 : cuse_blkgetsize64(fuse_req_t req, int cmd, void *arg,
     668             :                   struct fuse_file_info *fi, unsigned flags,
     669             :                   const void *in_buf, size_t in_bufsz, size_t out_bufsz)
     670             : {
     671           0 :         uint64_t size;
     672             :         struct spdk_nvme_ns *ns;
     673           0 :         struct cuse_device *cuse_device = fuse_req_userdata(req);
     674             : 
     675           0 :         FUSE_REPLY_CHECK_BUFFER(req, arg, out_bufsz, size);
     676             : 
     677           0 :         ns = spdk_nvme_ctrlr_get_ns(cuse_device->ctrlr, cuse_device->nsid);
     678           0 :         size = spdk_nvme_ns_get_num_sectors(ns);
     679           0 :         fuse_reply_ioctl(req, 0, &size, sizeof(size));
     680             : }
     681             : 
     682             : static void
     683           0 : cuse_blkpbszget(fuse_req_t req, int cmd, void *arg,
     684             :                 struct fuse_file_info *fi, unsigned flags,
     685             :                 const void *in_buf, size_t in_bufsz, size_t out_bufsz)
     686             : {
     687           0 :         int pbsz;
     688             :         struct spdk_nvme_ns *ns;
     689           0 :         struct cuse_device *cuse_device = fuse_req_userdata(req);
     690             : 
     691           0 :         FUSE_REPLY_CHECK_BUFFER(req, arg, out_bufsz, pbsz);
     692             : 
     693           0 :         ns = spdk_nvme_ctrlr_get_ns(cuse_device->ctrlr, cuse_device->nsid);
     694           0 :         pbsz = spdk_nvme_ns_get_sector_size(ns);
     695           0 :         fuse_reply_ioctl(req, 0, &pbsz, sizeof(pbsz));
     696             : }
     697             : 
     698             : static void
     699           0 : cuse_blkgetsize(fuse_req_t req, int cmd, void *arg,
     700             :                 struct fuse_file_info *fi, unsigned flags,
     701             :                 const void *in_buf, size_t in_bufsz, size_t out_bufsz)
     702             : {
     703           0 :         long size;
     704             :         struct spdk_nvme_ns *ns;
     705           0 :         struct cuse_device *cuse_device = fuse_req_userdata(req);
     706             : 
     707           0 :         FUSE_REPLY_CHECK_BUFFER(req, arg, out_bufsz, size);
     708             : 
     709           0 :         ns = spdk_nvme_ctrlr_get_ns(cuse_device->ctrlr, cuse_device->nsid);
     710             : 
     711             :         /* return size in 512 bytes blocks */
     712           0 :         size = spdk_nvme_ns_get_num_sectors(ns) * 512 / spdk_nvme_ns_get_sector_size(ns);
     713           0 :         fuse_reply_ioctl(req, 0, &size, sizeof(size));
     714             : }
     715             : 
     716             : static void
     717           0 : cuse_blkgetsectorsize(fuse_req_t req, int cmd, void *arg,
     718             :                       struct fuse_file_info *fi, unsigned flags,
     719             :                       const void *in_buf, size_t in_bufsz, size_t out_bufsz)
     720             : {
     721           0 :         int ssize;
     722             :         struct spdk_nvme_ns *ns;
     723           0 :         struct cuse_device *cuse_device = fuse_req_userdata(req);
     724             : 
     725           0 :         FUSE_REPLY_CHECK_BUFFER(req, arg, out_bufsz, ssize);
     726             : 
     727           0 :         ns = spdk_nvme_ctrlr_get_ns(cuse_device->ctrlr, cuse_device->nsid);
     728           0 :         ssize = spdk_nvme_ns_get_sector_size(ns);
     729           0 :         fuse_reply_ioctl(req, 0, &ssize, sizeof(ssize));
     730             : }
     731             : 
     732             : static void
     733           0 : cuse_getid(fuse_req_t req, int cmd, void *arg,
     734             :            struct fuse_file_info *fi, unsigned flags,
     735             :            const void *in_buf, size_t in_bufsz, size_t out_bufsz)
     736             : {
     737           0 :         struct cuse_device *cuse_device = fuse_req_userdata(req);
     738             : 
     739           0 :         fuse_reply_ioctl(req, cuse_device->nsid, NULL, 0);
     740           0 : }
     741             : 
     742             : struct cuse_transport {
     743             :         char trstring[SPDK_NVMF_TRSTRING_MAX_LEN + 1];
     744             :         char traddr[SPDK_NVMF_TRADDR_MAX_LEN + 1];
     745             : };
     746             : 
     747             : #define SPDK_CUSE_GET_TRANSPORT _IOWR('n', 0x1, struct cuse_transport)
     748             : 
     749             : static void
     750           0 : cuse_get_transport(fuse_req_t req, int cmd, void *arg,
     751             :                    struct fuse_file_info *fi, unsigned flags,
     752             :                    const void *in_buf, size_t in_bufsz, size_t out_bufsz)
     753             : {
     754           0 :         struct cuse_device *cuse_device = fuse_req_userdata(req);
     755           0 :         struct cuse_transport tr = {};
     756             : 
     757           0 :         FUSE_REPLY_CHECK_BUFFER(req, arg, out_bufsz, tr);
     758             : 
     759           0 :         memcpy(tr.trstring, cuse_device->ctrlr->trid.trstring, SPDK_NVMF_TRSTRING_MAX_LEN + 1);
     760           0 :         memcpy(tr.traddr, cuse_device->ctrlr->trid.traddr, SPDK_NVMF_TRADDR_MAX_LEN + 1);
     761             : 
     762           0 :         fuse_reply_ioctl(req, 0, &tr, sizeof(tr));
     763             : }
     764             : 
     765             : static void
     766           0 : cuse_ctrlr_ioctl(fuse_req_t req, int cmd, void *arg,
     767             :                  struct fuse_file_info *fi, unsigned flags,
     768             :                  const void *in_buf, size_t in_bufsz, size_t out_bufsz)
     769             : {
     770           0 :         if (flags & FUSE_IOCTL_COMPAT) {
     771           0 :                 fuse_reply_err(req, ENOSYS);
     772           0 :                 return;
     773             :         }
     774             : 
     775           0 :         switch ((unsigned int)cmd) {
     776           0 :         case NVME_IOCTL_ADMIN_CMD:
     777           0 :                 SPDK_DEBUGLOG(nvme_cuse, "NVME_IOCTL_ADMIN_CMD\n");
     778           0 :                 cuse_nvme_passthru_cmd(req, cmd, arg, fi, flags, in_buf, in_bufsz, out_bufsz);
     779           0 :                 break;
     780             : 
     781           0 :         case NVME_IOCTL_RESET:
     782             :         case NVME_IOCTL_SUBSYS_RESET:
     783           0 :                 cuse_nvme_reset(req, cmd, arg, fi, flags, in_buf, in_bufsz, out_bufsz);
     784           0 :                 break;
     785             : 
     786           0 :         case NVME_IOCTL_RESCAN:
     787           0 :                 SPDK_DEBUGLOG(nvme_cuse, "NVME_IOCTL_RESCAN\n");
     788           0 :                 cuse_nvme_rescan(req, cmd, arg, fi, flags, in_buf, in_bufsz, out_bufsz);
     789           0 :                 break;
     790             : 
     791           0 :         case SPDK_CUSE_GET_TRANSPORT:
     792           0 :                 SPDK_DEBUGLOG(nvme_cuse, "SPDK_CUSE_GET_TRANSPORT\n");
     793           0 :                 cuse_get_transport(req, cmd, arg, fi, flags, in_buf, in_bufsz, out_bufsz);
     794           0 :                 break;
     795             : 
     796           0 :         default:
     797           0 :                 SPDK_ERRLOG("Unsupported IOCTL 0x%X.\n", cmd);
     798           0 :                 fuse_reply_err(req, ENOTTY);
     799             :         }
     800             : }
     801             : 
     802             : static void
     803           0 : cuse_ns_ioctl(fuse_req_t req, int cmd, void *arg,
     804             :               struct fuse_file_info *fi, unsigned flags,
     805             :               const void *in_buf, size_t in_bufsz, size_t out_bufsz)
     806             : {
     807           0 :         if (flags & FUSE_IOCTL_COMPAT) {
     808           0 :                 fuse_reply_err(req, ENOSYS);
     809           0 :                 return;
     810             :         }
     811             : 
     812           0 :         switch ((unsigned int)cmd) {
     813           0 :         case NVME_IOCTL_ADMIN_CMD:
     814           0 :                 SPDK_DEBUGLOG(nvme_cuse, "NVME_IOCTL_ADMIN_CMD\n");
     815           0 :                 cuse_nvme_passthru_cmd(req, cmd, arg, fi, flags, in_buf, in_bufsz, out_bufsz);
     816           0 :                 break;
     817             : 
     818           0 :         case NVME_IOCTL_SUBMIT_IO:
     819           0 :                 SPDK_DEBUGLOG(nvme_cuse, "NVME_IOCTL_SUBMIT_IO\n");
     820           0 :                 cuse_nvme_submit_io(req, cmd, arg, fi, flags, in_buf, in_bufsz, out_bufsz);
     821           0 :                 break;
     822             : 
     823           0 :         case NVME_IOCTL_IO_CMD:
     824           0 :                 SPDK_DEBUGLOG(nvme_cuse, "NVME_IOCTL_IO_CMD\n");
     825           0 :                 cuse_nvme_passthru_cmd(req, cmd, arg, fi, flags, in_buf, in_bufsz, out_bufsz);
     826           0 :                 break;
     827             : 
     828           0 :         case NVME_IOCTL_ID:
     829           0 :                 SPDK_DEBUGLOG(nvme_cuse, "NVME_IOCTL_ID\n");
     830           0 :                 cuse_getid(req, cmd, arg, fi, flags, in_buf, in_bufsz, out_bufsz);
     831           0 :                 break;
     832             : 
     833           0 :         case BLKPBSZGET:
     834           0 :                 SPDK_DEBUGLOG(nvme_cuse, "BLKPBSZGET\n");
     835           0 :                 cuse_blkpbszget(req, cmd, arg, fi, flags, in_buf, in_bufsz, out_bufsz);
     836           0 :                 break;
     837             : 
     838           0 :         case BLKSSZGET:
     839           0 :                 SPDK_DEBUGLOG(nvme_cuse, "BLKSSZGET\n");
     840           0 :                 cuse_blkgetsectorsize(req, cmd, arg, fi, flags, in_buf, in_bufsz, out_bufsz);
     841           0 :                 break;
     842             : 
     843           0 :         case BLKGETSIZE:
     844           0 :                 SPDK_DEBUGLOG(nvme_cuse, "BLKGETSIZE\n");
     845             :                 /* Returns the device size as a number of 512-byte blocks (returns pointer to long) */
     846           0 :                 cuse_blkgetsize(req, cmd, arg, fi, flags, in_buf, in_bufsz, out_bufsz);
     847           0 :                 break;
     848             : 
     849           0 :         case BLKGETSIZE64:
     850           0 :                 SPDK_DEBUGLOG(nvme_cuse, "BLKGETSIZE64\n");
     851             :                 /* Returns the device size in sectors (returns pointer to uint64_t) */
     852           0 :                 cuse_blkgetsize64(req, cmd, arg, fi, flags, in_buf, in_bufsz, out_bufsz);
     853           0 :                 break;
     854             : 
     855           0 :         default:
     856           0 :                 SPDK_ERRLOG("Unsupported IOCTL 0x%X.\n", cmd);
     857           0 :                 fuse_reply_err(req, ENOTTY);
     858             :         }
     859             : }
     860             : 
     861             : /*****************************************************************************
     862             :  * CUSE threads initialization.
     863             :  */
     864             : 
     865             : static void
     866           0 : cuse_open(fuse_req_t req, struct fuse_file_info *fi)
     867             : {
     868           0 :         fuse_reply_open(req, fi);
     869           0 : }
     870             : 
     871             : static const struct cuse_lowlevel_ops cuse_ctrlr_clop = {
     872             :         .open           = cuse_open,
     873             :         .ioctl          = cuse_ctrlr_ioctl,
     874             : };
     875             : 
     876             : static const struct cuse_lowlevel_ops cuse_ns_clop = {
     877             :         .open           = cuse_open,
     878             :         .ioctl          = cuse_ns_ioctl,
     879             : };
     880             : 
     881             : static int
     882           0 : cuse_session_create(struct cuse_device *cuse_device)
     883             : {
     884           0 :         char *cuse_argv[] = { "cuse", "-f" };
     885           0 :         int multithreaded;
     886           0 :         int cuse_argc = SPDK_COUNTOF(cuse_argv);
     887           0 :         struct cuse_info ci;
     888           0 :         char devname_arg[128 + 8];
     889           0 :         const char *dev_info_argv[] = { devname_arg };
     890             : 
     891           0 :         snprintf(devname_arg, sizeof(devname_arg), "DEVNAME=%s", cuse_device->dev_name);
     892             : 
     893           0 :         memset(&ci, 0, sizeof(ci));
     894           0 :         ci.dev_info_argc = 1;
     895           0 :         ci.dev_info_argv = dev_info_argv;
     896           0 :         ci.flags = CUSE_UNRESTRICTED_IOCTL;
     897             : 
     898           0 :         if (cuse_device->nsid) {
     899           0 :                 cuse_device->session = cuse_lowlevel_setup(cuse_argc, cuse_argv, &ci, &cuse_ns_clop,
     900             :                                        &multithreaded, cuse_device);
     901             :         } else {
     902           0 :                 cuse_device->session = cuse_lowlevel_setup(cuse_argc, cuse_argv, &ci, &cuse_ctrlr_clop,
     903             :                                        &multithreaded, cuse_device);
     904             :         }
     905             : 
     906           0 :         if (!cuse_device->session) {
     907           0 :                 SPDK_ERRLOG("Cannot create cuse session\n");
     908           0 :                 return -1;
     909             :         }
     910           0 :         SPDK_NOTICELOG("fuse session for device %s created\n", cuse_device->dev_name);
     911           0 :         return 0;
     912             : }
     913             : 
     914             : static void *
     915           0 : cuse_thread(void *arg)
     916             : {
     917           0 :         struct cuse_device *cuse_device = arg;
     918             :         int rc;
     919           0 :         struct fuse_buf buf = { .mem = NULL };
     920           0 :         struct pollfd fds;
     921           0 :         int timeout_msecs = 500;
     922             : 
     923           0 :         spdk_unaffinitize_thread();
     924             : 
     925             :         /* Receive and process fuse requests */
     926           0 :         fds.fd = fuse_session_fd(cuse_device->session);
     927           0 :         fds.events = POLLIN;
     928           0 :         while (!fuse_session_exited(cuse_device->session)) {
     929           0 :                 rc = poll(&fds, 1, timeout_msecs);
     930           0 :                 if (rc <= 0) {
     931           0 :                         continue;
     932             :                 }
     933           0 :                 rc = fuse_session_receive_buf(cuse_device->session, &buf);
     934           0 :                 if (rc > 0) {
     935           0 :                         fuse_session_process_buf(cuse_device->session, &buf);
     936             :                 }
     937             :         }
     938           0 :         free(buf.mem);
     939           0 :         fuse_session_reset(cuse_device->session);
     940           0 :         pthread_exit(NULL);
     941             : }
     942             : 
     943             : static struct cuse_device *nvme_cuse_get_cuse_ns_device(struct spdk_nvme_ctrlr *ctrlr,
     944             :                 uint32_t nsid);
     945             : 
     946             : /*****************************************************************************
     947             :  * CUSE devices management
     948             :  */
     949             : 
     950             : static int
     951           0 : cuse_nvme_ns_start(struct cuse_device *ctrlr_device, uint32_t nsid)
     952             : {
     953             :         struct cuse_device *ns_device;
     954             :         int rv;
     955             : 
     956           0 :         ns_device = nvme_cuse_get_cuse_ns_device(ctrlr_device->ctrlr, nsid);
     957           0 :         if (ns_device != NULL) {
     958           0 :                 return 0;
     959             :         }
     960             : 
     961           0 :         ns_device = calloc(1, sizeof(struct cuse_device));
     962           0 :         if (ns_device == NULL) {
     963           0 :                 return -ENOMEM;
     964             :         }
     965             : 
     966           0 :         ns_device->ctrlr = ctrlr_device->ctrlr;
     967           0 :         ns_device->ctrlr_device = ctrlr_device;
     968           0 :         ns_device->nsid = nsid;
     969           0 :         rv = snprintf(ns_device->dev_name, sizeof(ns_device->dev_name), "%sn%d",
     970           0 :                       ctrlr_device->dev_name, ns_device->nsid);
     971           0 :         if (rv < 0) {
     972           0 :                 SPDK_ERRLOG("Device name too long.\n");
     973           0 :                 free(ns_device);
     974           0 :                 return -ENAMETOOLONG;
     975             :         }
     976           0 :         rv = cuse_session_create(ns_device);
     977           0 :         if (rv != 0) {
     978           0 :                 free(ns_device);
     979           0 :                 return rv;
     980             :         }
     981           0 :         rv = pthread_create(&ns_device->tid, NULL, cuse_thread, ns_device);
     982           0 :         if (rv != 0) {
     983           0 :                 SPDK_ERRLOG("pthread_create failed\n");
     984           0 :                 free(ns_device);
     985           0 :                 return -rv;
     986             :         }
     987           0 :         TAILQ_INSERT_TAIL(&ctrlr_device->ns_devices, ns_device, tailq);
     988             : 
     989           0 :         return 0;
     990             : }
     991             : 
     992             : static void
     993           2 : cuse_nvme_ns_stop(struct cuse_device *ctrlr_device, struct cuse_device *ns_device)
     994             : {
     995           2 :         if (ns_device->session != NULL) {
     996           0 :                 fuse_session_exit(ns_device->session);
     997             :         }
     998           2 :         pthread_join(ns_device->tid, NULL);
     999           2 :         TAILQ_REMOVE(&ctrlr_device->ns_devices, ns_device, tailq);
    1000           2 :         if (ns_device->session != NULL) {
    1001           0 :                 cuse_lowlevel_teardown(ns_device->session);
    1002             :         }
    1003           2 :         free(ns_device);
    1004           2 : }
    1005             : 
    1006             : static int
    1007           0 : nvme_cuse_claim(struct cuse_device *ctrlr_device, uint32_t index)
    1008             : {
    1009             :         int dev_fd;
    1010             :         int pid;
    1011             :         void *dev_map;
    1012           0 :         struct flock cusedev_lock = {
    1013             :                 .l_type = F_WRLCK,
    1014             :                 .l_whence = SEEK_SET,
    1015             :                 .l_start = 0,
    1016             :                 .l_len = 0,
    1017             :         };
    1018             : 
    1019           0 :         snprintf(ctrlr_device->lock_name, sizeof(ctrlr_device->lock_name),
    1020             :                  "/var/tmp/spdk_nvme_cuse_lock_%" PRIu32, index);
    1021             : 
    1022           0 :         dev_fd = open(ctrlr_device->lock_name, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
    1023           0 :         if (dev_fd == -1) {
    1024           0 :                 SPDK_ERRLOG("could not open %s\n", ctrlr_device->lock_name);
    1025           0 :                 return -errno;
    1026             :         }
    1027             : 
    1028           0 :         if (ftruncate(dev_fd, sizeof(int)) != 0) {
    1029           0 :                 SPDK_ERRLOG("could not truncate %s\n", ctrlr_device->lock_name);
    1030           0 :                 close(dev_fd);
    1031           0 :                 return -errno;
    1032             :         }
    1033             : 
    1034           0 :         dev_map = mmap(NULL, sizeof(int), PROT_READ | PROT_WRITE,
    1035             :                        MAP_SHARED, dev_fd, 0);
    1036           0 :         if (dev_map == MAP_FAILED) {
    1037           0 :                 SPDK_ERRLOG("could not mmap dev %s (%d)\n", ctrlr_device->lock_name, errno);
    1038           0 :                 close(dev_fd);
    1039           0 :                 return -errno;
    1040             :         }
    1041             : 
    1042           0 :         if (fcntl(dev_fd, F_SETLK, &cusedev_lock) != 0) {
    1043           0 :                 pid = *(int *)dev_map;
    1044           0 :                 SPDK_ERRLOG("Cannot create lock on device %s, probably"
    1045             :                             " process %d has claimed it\n", ctrlr_device->lock_name, pid);
    1046           0 :                 munmap(dev_map, sizeof(int));
    1047           0 :                 close(dev_fd);
    1048             :                 /* F_SETLK returns unspecified errnos, normalize them */
    1049           0 :                 return -EACCES;
    1050             :         }
    1051             : 
    1052           0 :         *(int *)dev_map = (int)getpid();
    1053           0 :         munmap(dev_map, sizeof(int));
    1054           0 :         ctrlr_device->claim_fd = dev_fd;
    1055           0 :         ctrlr_device->index = index;
    1056             :         /* Keep dev_fd open to maintain the lock. */
    1057           0 :         return 0;
    1058             : }
    1059             : 
    1060             : static void
    1061           1 : nvme_cuse_unclaim(struct cuse_device *ctrlr_device)
    1062             : {
    1063           1 :         close(ctrlr_device->claim_fd);
    1064           1 :         ctrlr_device->claim_fd = -1;
    1065           1 :         unlink(ctrlr_device->lock_name);
    1066           1 : }
    1067             : 
    1068             : static void
    1069           1 : cuse_nvme_ctrlr_stop(struct cuse_device *ctrlr_device)
    1070             : {
    1071             :         struct cuse_device *ns_device, *tmp;
    1072             : 
    1073           3 :         TAILQ_FOREACH_SAFE(ns_device, &ctrlr_device->ns_devices, tailq, tmp) {
    1074           2 :                 cuse_nvme_ns_stop(ctrlr_device, ns_device);
    1075             :         }
    1076             : 
    1077           1 :         assert(TAILQ_EMPTY(&ctrlr_device->ns_devices));
    1078             : 
    1079           1 :         fuse_session_exit(ctrlr_device->session);
    1080           1 :         pthread_join(ctrlr_device->tid, NULL);
    1081           1 :         TAILQ_REMOVE(&g_ctrlr_ctx_head, ctrlr_device, tailq);
    1082           1 :         spdk_bit_array_clear(g_ctrlr_started, ctrlr_device->index);
    1083           1 :         if (spdk_bit_array_count_set(g_ctrlr_started) == 0) {
    1084           1 :                 spdk_bit_array_free(&g_ctrlr_started);
    1085             :         }
    1086           1 :         nvme_cuse_unclaim(ctrlr_device);
    1087           1 :         if (ctrlr_device->session != NULL) {
    1088           0 :                 cuse_lowlevel_teardown(ctrlr_device->session);
    1089             :         }
    1090           1 :         free(ctrlr_device);
    1091           1 : }
    1092             : 
    1093             : static int
    1094           0 : cuse_nvme_ctrlr_update_namespaces(struct cuse_device *ctrlr_device)
    1095             : {
    1096             :         struct cuse_device *ns_device, *tmp;
    1097             :         uint32_t nsid;
    1098             : 
    1099             :         /* Remove namespaces that have disappeared */
    1100           0 :         TAILQ_FOREACH_SAFE(ns_device, &ctrlr_device->ns_devices, tailq, tmp) {
    1101           0 :                 if (!spdk_nvme_ctrlr_is_active_ns(ctrlr_device->ctrlr, ns_device->nsid)) {
    1102           0 :                         cuse_nvme_ns_stop(ctrlr_device, ns_device);
    1103             :                 }
    1104             :         }
    1105             : 
    1106             :         /* Add new namespaces */
    1107           0 :         nsid = spdk_nvme_ctrlr_get_first_active_ns(ctrlr_device->ctrlr);
    1108           0 :         while (nsid != 0) {
    1109           0 :                 if (cuse_nvme_ns_start(ctrlr_device, nsid) < 0) {
    1110           0 :                         SPDK_ERRLOG("Cannot start CUSE namespace device.");
    1111           0 :                         return -1;
    1112             :                 }
    1113             : 
    1114           0 :                 nsid = spdk_nvme_ctrlr_get_next_active_ns(ctrlr_device->ctrlr, nsid);
    1115             :         }
    1116             : 
    1117           0 :         return 0;
    1118             : }
    1119             : 
    1120             : #ifdef FUSE_LOG_H_
    1121             : static void
    1122             : nvme_fuse_log_func(enum fuse_log_level level, const char *fmt, va_list ap)
    1123             : {
    1124             :         /* fuse will unnecessarily print this log message when tearing down
    1125             :          * sessions, once for every session after the first. So use this custom
    1126             :          * log handler to silence that specific log message.
    1127             :          */
    1128             :         if (strstr(fmt, "fuse_remove_signal_handlers: unknown session") != NULL) {
    1129             :                 return;
    1130             :         }
    1131             : 
    1132             :         vfprintf(stderr, fmt, ap);
    1133             : }
    1134             : #endif
    1135             : 
    1136             : static int
    1137           0 : nvme_cuse_start(struct spdk_nvme_ctrlr *ctrlr)
    1138             : {
    1139           0 :         int rv = 0;
    1140             :         struct cuse_device *ctrlr_device;
    1141             : 
    1142           0 :         SPDK_NOTICELOG("Creating cuse device for controller\n");
    1143             : 
    1144           0 :         if (g_ctrlr_started == NULL) {
    1145           0 :                 g_ctrlr_started = spdk_bit_array_create(128);
    1146           0 :                 if (g_ctrlr_started == NULL) {
    1147           0 :                         SPDK_ERRLOG("Cannot create bit array\n");
    1148           0 :                         return -ENOMEM;
    1149             :                 }
    1150             : #ifdef FUSE_LOG_H_
    1151             :                 /* Older versions of libfuse don't have fuse_set_log_func nor
    1152             :                  * fuse_log.h, so this is the easiest way to check for it
    1153             :                  * without adding a separate CONFIG flag.
    1154             :                  */
    1155             :                 fuse_set_log_func(nvme_fuse_log_func);
    1156             : #endif
    1157             :         }
    1158             : 
    1159           0 :         ctrlr_device = (struct cuse_device *)calloc(1, sizeof(struct cuse_device));
    1160           0 :         if (!ctrlr_device) {
    1161           0 :                 SPDK_ERRLOG("Cannot allocate memory for ctrlr_device.");
    1162           0 :                 rv = -ENOMEM;
    1163           0 :                 goto free_device;
    1164             :         }
    1165             : 
    1166           0 :         ctrlr_device->ctrlr = ctrlr;
    1167             : 
    1168             :         /* Check if device already exists, if not increment index until success */
    1169           0 :         ctrlr_device->index = 0;
    1170             :         while (1) {
    1171           0 :                 ctrlr_device->index = spdk_bit_array_find_first_clear(g_ctrlr_started, ctrlr_device->index);
    1172           0 :                 if (ctrlr_device->index == UINT32_MAX) {
    1173           0 :                         SPDK_ERRLOG("Too many registered controllers\n");
    1174           0 :                         goto free_device;
    1175             :                 }
    1176             : 
    1177           0 :                 if (nvme_cuse_claim(ctrlr_device, ctrlr_device->index) == 0) {
    1178           0 :                         break;
    1179             :                 }
    1180           0 :                 ctrlr_device->index++;
    1181             :         }
    1182           0 :         spdk_bit_array_set(g_ctrlr_started, ctrlr_device->index);
    1183           0 :         snprintf(ctrlr_device->dev_name, sizeof(ctrlr_device->dev_name), "spdk/nvme%d",
    1184             :                  ctrlr_device->index);
    1185             : 
    1186           0 :         rv = cuse_session_create(ctrlr_device);
    1187           0 :         if (rv != 0) {
    1188           0 :                 goto clear_and_free;
    1189             :         }
    1190             : 
    1191           0 :         rv = pthread_create(&ctrlr_device->tid, NULL, cuse_thread, ctrlr_device);
    1192           0 :         if (rv != 0) {
    1193           0 :                 SPDK_ERRLOG("pthread_create failed\n");
    1194           0 :                 rv = -rv;
    1195           0 :                 goto clear_and_free;
    1196             :         }
    1197             : 
    1198           0 :         TAILQ_INSERT_TAIL(&g_ctrlr_ctx_head, ctrlr_device, tailq);
    1199             : 
    1200           0 :         TAILQ_INIT(&ctrlr_device->ns_devices);
    1201             : 
    1202             :         /* Start all active namespaces */
    1203           0 :         if (cuse_nvme_ctrlr_update_namespaces(ctrlr_device) < 0) {
    1204           0 :                 SPDK_ERRLOG("Cannot start CUSE namespace devices.");
    1205           0 :                 cuse_nvme_ctrlr_stop(ctrlr_device);
    1206           0 :                 return -1;
    1207             :         }
    1208             : 
    1209           0 :         return 0;
    1210             : 
    1211           0 : clear_and_free:
    1212           0 :         spdk_bit_array_clear(g_ctrlr_started, ctrlr_device->index);
    1213           0 : free_device:
    1214           0 :         free(ctrlr_device);
    1215           0 :         if (spdk_bit_array_count_set(g_ctrlr_started) == 0) {
    1216           0 :                 spdk_bit_array_free(&g_ctrlr_started);
    1217             :         }
    1218           0 :         return rv;
    1219             : }
    1220             : 
    1221             : static struct cuse_device *
    1222          11 : nvme_cuse_get_cuse_ctrlr_device(struct spdk_nvme_ctrlr *ctrlr)
    1223             : {
    1224          11 :         struct cuse_device *ctrlr_device = NULL;
    1225             : 
    1226          13 :         TAILQ_FOREACH(ctrlr_device, &g_ctrlr_ctx_head, tailq) {
    1227          11 :                 if (ctrlr_device->ctrlr == ctrlr) {
    1228           9 :                         break;
    1229             :                 }
    1230             :         }
    1231             : 
    1232          11 :         return ctrlr_device;
    1233             : }
    1234             : 
    1235             : static struct cuse_device *
    1236           7 : nvme_cuse_get_cuse_ns_device(struct spdk_nvme_ctrlr *ctrlr, uint32_t nsid)
    1237             : {
    1238           7 :         struct cuse_device *ctrlr_device = NULL;
    1239             :         struct cuse_device *ns_device;
    1240             : 
    1241           7 :         ctrlr_device = nvme_cuse_get_cuse_ctrlr_device(ctrlr);
    1242           7 :         if (!ctrlr_device) {
    1243           1 :                 return NULL;
    1244             :         }
    1245             : 
    1246          10 :         TAILQ_FOREACH(ns_device, &ctrlr_device->ns_devices, tailq) {
    1247           7 :                 if (ns_device->nsid == nsid) {
    1248           3 :                         return ns_device;
    1249             :                 }
    1250             :         }
    1251             : 
    1252           3 :         return NULL;
    1253             : }
    1254             : 
    1255             : static void
    1256           1 : nvme_cuse_stop(struct spdk_nvme_ctrlr *ctrlr)
    1257             : {
    1258             :         struct cuse_device *ctrlr_device;
    1259             : 
    1260           1 :         assert(spdk_process_is_primary());
    1261             : 
    1262           1 :         pthread_mutex_lock(&g_cuse_mtx);
    1263             : 
    1264           1 :         ctrlr_device = nvme_cuse_get_cuse_ctrlr_device(ctrlr);
    1265           1 :         if (!ctrlr_device) {
    1266           0 :                 SPDK_ERRLOG("Cannot find associated CUSE device\n");
    1267           0 :                 pthread_mutex_unlock(&g_cuse_mtx);
    1268           0 :                 return;
    1269             :         }
    1270             : 
    1271           1 :         cuse_nvme_ctrlr_stop(ctrlr_device);
    1272             : 
    1273           1 :         pthread_mutex_unlock(&g_cuse_mtx);
    1274             : }
    1275             : 
    1276             : static void
    1277           0 : nvme_cuse_update(struct spdk_nvme_ctrlr *ctrlr)
    1278             : {
    1279             :         struct cuse_device *ctrlr_device;
    1280             : 
    1281           0 :         assert(spdk_process_is_primary());
    1282             : 
    1283           0 :         pthread_mutex_lock(&g_cuse_mtx);
    1284             : 
    1285           0 :         ctrlr_device = nvme_cuse_get_cuse_ctrlr_device(ctrlr);
    1286           0 :         if (!ctrlr_device) {
    1287           0 :                 pthread_mutex_unlock(&g_cuse_mtx);
    1288           0 :                 return;
    1289             :         }
    1290             : 
    1291           0 :         cuse_nvme_ctrlr_update_namespaces(ctrlr_device);
    1292             : 
    1293           0 :         pthread_mutex_unlock(&g_cuse_mtx);
    1294             : }
    1295             : 
    1296             : static struct nvme_io_msg_producer cuse_nvme_io_msg_producer = {
    1297             :         .name = "cuse",
    1298             :         .stop = nvme_cuse_stop,
    1299             :         .update = nvme_cuse_update,
    1300             : };
    1301             : 
    1302             : int
    1303           0 : spdk_nvme_cuse_register(struct spdk_nvme_ctrlr *ctrlr)
    1304             : {
    1305             :         int rc;
    1306             : 
    1307           0 :         if (!spdk_process_is_primary()) {
    1308           0 :                 SPDK_ERRLOG("only allowed from primary process\n");
    1309           0 :                 return -EINVAL;
    1310             :         }
    1311             : 
    1312           0 :         rc = nvme_io_msg_ctrlr_register(ctrlr, &cuse_nvme_io_msg_producer);
    1313           0 :         if (rc) {
    1314           0 :                 return rc;
    1315             :         }
    1316             : 
    1317           0 :         pthread_mutex_lock(&g_cuse_mtx);
    1318             : 
    1319           0 :         rc = nvme_cuse_start(ctrlr);
    1320           0 :         if (rc) {
    1321           0 :                 nvme_io_msg_ctrlr_unregister(ctrlr, &cuse_nvme_io_msg_producer);
    1322             :         }
    1323             : 
    1324           0 :         pthread_mutex_unlock(&g_cuse_mtx);
    1325             : 
    1326           0 :         return rc;
    1327             : }
    1328             : 
    1329             : int
    1330           0 : spdk_nvme_cuse_unregister(struct spdk_nvme_ctrlr *ctrlr)
    1331             : {
    1332             :         struct cuse_device *ctrlr_device;
    1333             : 
    1334           0 :         if (!spdk_process_is_primary()) {
    1335           0 :                 SPDK_ERRLOG("only allowed from primary process\n");
    1336           0 :                 return -EINVAL;
    1337             :         }
    1338             : 
    1339           0 :         pthread_mutex_lock(&g_cuse_mtx);
    1340             : 
    1341           0 :         ctrlr_device = nvme_cuse_get_cuse_ctrlr_device(ctrlr);
    1342           0 :         if (!ctrlr_device) {
    1343           0 :                 SPDK_ERRLOG("Cannot find associated CUSE device\n");
    1344           0 :                 pthread_mutex_unlock(&g_cuse_mtx);
    1345           0 :                 return -ENODEV;
    1346             :         }
    1347             : 
    1348           0 :         cuse_nvme_ctrlr_stop(ctrlr_device);
    1349             : 
    1350           0 :         pthread_mutex_unlock(&g_cuse_mtx);
    1351             : 
    1352           0 :         nvme_io_msg_ctrlr_unregister(ctrlr, &cuse_nvme_io_msg_producer);
    1353             : 
    1354           0 :         return 0;
    1355             : }
    1356             : 
    1357             : void
    1358           0 : spdk_nvme_cuse_update_namespaces(struct spdk_nvme_ctrlr *ctrlr)
    1359             : {
    1360           0 :         nvme_cuse_update(ctrlr);
    1361           0 : }
    1362             : 
    1363             : int
    1364           3 : spdk_nvme_cuse_get_ctrlr_name(struct spdk_nvme_ctrlr *ctrlr, char *name, size_t *size)
    1365             : {
    1366             :         struct cuse_device *ctrlr_device;
    1367             :         size_t req_len;
    1368             : 
    1369           3 :         pthread_mutex_lock(&g_cuse_mtx);
    1370             : 
    1371           3 :         ctrlr_device = nvme_cuse_get_cuse_ctrlr_device(ctrlr);
    1372           3 :         if (!ctrlr_device) {
    1373           1 :                 pthread_mutex_unlock(&g_cuse_mtx);
    1374           1 :                 return -ENODEV;
    1375             :         }
    1376             : 
    1377           2 :         req_len = strnlen(ctrlr_device->dev_name, sizeof(ctrlr_device->dev_name));
    1378           2 :         if (*size < req_len) {
    1379           1 :                 *size = req_len;
    1380           1 :                 pthread_mutex_unlock(&g_cuse_mtx);
    1381           1 :                 return -ENOSPC;
    1382             :         }
    1383           1 :         snprintf(name, req_len + 1, "%s", ctrlr_device->dev_name);
    1384             : 
    1385           1 :         pthread_mutex_unlock(&g_cuse_mtx);
    1386             : 
    1387           1 :         return 0;
    1388             : }
    1389             : 
    1390             : int
    1391           4 : spdk_nvme_cuse_get_ns_name(struct spdk_nvme_ctrlr *ctrlr, uint32_t nsid, char *name, size_t *size)
    1392             : {
    1393             :         struct cuse_device *ns_device;
    1394             :         size_t req_len;
    1395             : 
    1396           4 :         pthread_mutex_lock(&g_cuse_mtx);
    1397             : 
    1398           4 :         ns_device = nvme_cuse_get_cuse_ns_device(ctrlr, nsid);
    1399           4 :         if (!ns_device) {
    1400           2 :                 pthread_mutex_unlock(&g_cuse_mtx);
    1401           2 :                 return -ENODEV;
    1402             :         }
    1403             : 
    1404           2 :         req_len = strnlen(ns_device->dev_name, sizeof(ns_device->dev_name));
    1405           2 :         if (*size < req_len) {
    1406           1 :                 *size = req_len;
    1407           1 :                 pthread_mutex_unlock(&g_cuse_mtx);
    1408           1 :                 return -ENOSPC;
    1409             :         }
    1410           1 :         snprintf(name, req_len + 1, "%s", ns_device->dev_name);
    1411             : 
    1412           1 :         pthread_mutex_unlock(&g_cuse_mtx);
    1413             : 
    1414           1 :         return 0;
    1415             : }
    1416             : 
    1417           1 : SPDK_LOG_REGISTER_COMPONENT(nvme_cuse)
    1418             : 
    1419             : #else /* SPDK_CONFIG_NVME_CUSE */
    1420             : 
    1421             : int
    1422             : spdk_nvme_cuse_get_ctrlr_name(struct spdk_nvme_ctrlr *ctrlr, char *name, size_t *size)
    1423             : {
    1424             :         SPDK_ERRLOG("spdk_nvme_cuse_get_ctrlr_name() is unsupported\n");
    1425             :         return -ENOTSUP;
    1426             : }
    1427             : 
    1428             : int
    1429             : spdk_nvme_cuse_get_ns_name(struct spdk_nvme_ctrlr *ctrlr, uint32_t nsid, char *name, size_t *size)
    1430             : {
    1431             :         SPDK_ERRLOG("spdk_nvme_cuse_get_ns_name() is unsupported\n");
    1432             :         return -ENOTSUP;
    1433             : }
    1434             : 
    1435             : int
    1436             : spdk_nvme_cuse_register(struct spdk_nvme_ctrlr *ctrlr)
    1437             : {
    1438             :         SPDK_ERRLOG("spdk_nvme_cuse_register() is unsupported\n");
    1439             :         return -ENOTSUP;
    1440             : }
    1441             : 
    1442             : int
    1443             : spdk_nvme_cuse_unregister(struct spdk_nvme_ctrlr *ctrlr)
    1444             : {
    1445             :         SPDK_ERRLOG("spdk_nvme_cuse_unregister() is unsupported\n");
    1446             :         return -ENOTSUP;
    1447             : }
    1448             : 
    1449             : void
    1450             : spdk_nvme_cuse_update_namespaces(struct spdk_nvme_ctrlr *ctrlr)
    1451             : {
    1452             :         SPDK_ERRLOG("spdk_nvme_cuse_update_namespaces() is unsupported\n");
    1453             : }
    1454             : 
    1455             : #endif

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