Fix devdax_open_ipc_handle()

devdax_open_ipc_handle() has to use the path and the size
of the remote /dev/dax got from the IPC handle
and not the local one.

Signed-off-by: Lukasz Dorau <lukasz.dorau@intel.com>

Author: ldorau

src/provider/provider_devdax_memory.c

@@ -369,9 +369,9 @@ static umf_result_t devdax_allocation_merge(void *provider, void *lowPtr,
 }
 
 typedef struct devdax_ipc_data_t {
-    char dd_path[PATH_MAX]; // path to the /dev/dax
-    size_t dd_size;         // size of the /dev/dax
-    size_t offset;          // offset of the data
+    char path[PATH_MAX]; // path to the /dev/dax
+    size_t size;         // size of the /dev/dax
+    size_t offset;       // offset of the data
 } devdax_ipc_data_t;
 
 static umf_result_t devdax_get_ipc_handle_size(void *provider, size_t *size) {
@@ -398,9 +398,9 @@ static umf_result_t devdax_get_ipc_handle(void *provider, const void *ptr,
     devdax_ipc_data_t *devdax_ipc_data = (devdax_ipc_data_t *)providerIpcData;
     devdax_ipc_data->offset =
         (size_t)((uintptr_t)ptr - (uintptr_t)devdax_provider->base);
-    strncpy(devdax_ipc_data->dd_path, devdax_provider->path, PATH_MAX - 1);
-    devdax_ipc_data->dd_path[PATH_MAX - 1] = '\0';
-    devdax_ipc_data->dd_size = devdax_provider->size;
+    strncpy(devdax_ipc_data->path, devdax_provider->path, PATH_MAX - 1);
+    devdax_ipc_data->path[PATH_MAX - 1] = '\0';
+    devdax_ipc_data->size = devdax_provider->size;
 
     return UMF_RESULT_SUCCESS;
 }
@@ -416,16 +416,16 @@ static umf_result_t devdax_put_ipc_handle(void *provider,
     devdax_ipc_data_t *devdax_ipc_data = (devdax_ipc_data_t *)providerIpcData;
 
     // verify the path of the /dev/dax
-    if (strncmp(devdax_ipc_data->dd_path, devdax_provider->path, PATH_MAX)) {
+    if (strncmp(devdax_ipc_data->path, devdax_provider->path, PATH_MAX)) {
         LOG_ERR("devdax path mismatch (local: %s, ipc: %s)",
-                devdax_provider->path, devdax_ipc_data->dd_path);
+                devdax_provider->path, devdax_ipc_data->path);
         return UMF_RESULT_ERROR_INVALID_ARGUMENT;
     }
 
     // verify the size of the /dev/dax
-    if (devdax_ipc_data->dd_size != devdax_provider->size) {
+    if (devdax_ipc_data->size != devdax_provider->size) {
         LOG_ERR("devdax size mismatch (local: %zu, ipc: %zu)",
-                devdax_provider->size, devdax_ipc_data->dd_size);
+                devdax_provider->size, devdax_ipc_data->size);
         return UMF_RESULT_ERROR_INVALID_ARGUMENT;
     }
 
@@ -442,47 +442,33 @@ static umf_result_t devdax_open_ipc_handle(void *provider,
         (devdax_memory_provider_t *)provider;
     devdax_ipc_data_t *devdax_ipc_data = (devdax_ipc_data_t *)providerIpcData;
 
-    // verify it is the same devdax - first verify the path
-    if (strncmp(devdax_ipc_data->dd_path, devdax_provider->path, PATH_MAX)) {
-        LOG_ERR("devdax path mismatch (local: %s, ipc: %s)",
-                devdax_provider->path, devdax_ipc_data->dd_path);
-        return UMF_RESULT_ERROR_INVALID_ARGUMENT;
-    }
-
-    // verify the size of the /dev/dax
-    if (devdax_ipc_data->dd_size != devdax_provider->size) {
-        LOG_ERR("devdax size mismatch (local: %zu, ipc: %zu)",
-                devdax_provider->size, devdax_ipc_data->dd_size);
-        return UMF_RESULT_ERROR_INVALID_ARGUMENT;
-    }
-
     umf_result_t ret = UMF_RESULT_SUCCESS;
-    int fd = utils_devdax_open(devdax_provider->path);
+    int fd = utils_devdax_open(devdax_ipc_data->path);
     if (fd == -1) {
-        LOG_PERR("opening a devdax (%s) failed", devdax_provider->path);
+        LOG_PERR("opening the devdax (%s) failed", devdax_ipc_data->path);
         return UMF_RESULT_ERROR_INVALID_ARGUMENT;
     }
 
     unsigned map_sync_flag = 0;
     utils_translate_mem_visibility_flag(UMF_MEM_MAP_SYNC, &map_sync_flag);
 
     // mmap /dev/dax with the MAP_SYNC xor MAP_SHARED flag (if MAP_SYNC fails)
-    char *base = utils_mmap_file(NULL, devdax_provider->size,
+    char *base = utils_mmap_file(NULL, devdax_ipc_data->size,
                                  devdax_provider->protection, map_sync_flag, fd,
                                  0 /* offset */);
     if (base == NULL) {
         devdax_store_last_native_error(UMF_DEVDAX_RESULT_ERROR_ALLOC_FAILED,
                                        errno);
         LOG_PERR("devdax mapping failed (path: %s, size: %zu, protection: %i, "
                  "fd: %i)",
-                 devdax_provider->path, devdax_provider->size,
+                 devdax_ipc_data->path, devdax_ipc_data->size,
                  devdax_provider->protection, fd);
         ret = UMF_RESULT_ERROR_MEMORY_PROVIDER_SPECIFIC;
     }
 
     LOG_DEBUG("devdax mapped (path: %s, size: %zu, protection: %i, fd: %i, "
               "offset: %zu)",
-              devdax_provider->path, devdax_provider->size,
+              devdax_ipc_data->path, devdax_ipc_data->size,
               devdax_provider->protection, fd, devdax_ipc_data->offset);
 
     (void)utils_close_fd(fd);