Explicitly validate superblock after load

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>

Additional changes - load sb recovery CRC check

Signed-off-by: Krzysztof Majzerowicz-Jaszcz <krzysztof.majzerowicz-jaszcz@intel.com>

inc/ocf_def.h

@@ -83,7 +83,7 @@
 /**
  * Maximum value of a valid core sequence number
  */
-#define OCF_SEQ_NO_MAX (65535UL)
+#define OCF_SEQ_NO_MAX ((1ULL << (sizeof(ocf_core_id_t) * 8)) - 1)
 /*
  * Invalid value of core sequence number
  */

src/engine/cache_engine.c

@@ -286,3 +286,10 @@ void ocf_engine_hndl_ops_req(struct ocf_request *req)
 
 	ocf_engine_push_req_back(req, true);
 }
+
+bool ocf_req_cache_mode_has_lazy_write(ocf_req_cache_mode_t mode)
+{
+	return ocf_cache_mode_is_valid((ocf_cache_mode_t)mode) &&
+			ocf_mngt_cache_mode_has_lazy_write(
+					(ocf_cache_mode_t)mode);
+}

src/engine/cache_engine.h

@@ -52,17 +52,7 @@ static inline const char *ocf_get_io_iface_name(ocf_cache_mode_t cache_mode)
 	return iface ? iface->name : "Unknown";
 }
 
-static inline bool ocf_cache_mode_is_valid(ocf_cache_mode_t mode)
-{
-	return mode >= ocf_cache_mode_wt && mode < ocf_cache_mode_max;
-}
-
-static inline bool ocf_req_cache_mode_has_lazy_write(ocf_req_cache_mode_t mode)
-{
-	return ocf_cache_mode_is_valid((ocf_cache_mode_t)mode) &&
-			ocf_mngt_cache_mode_has_lazy_write(
-					(ocf_cache_mode_t)mode);
-}
+bool ocf_req_cache_mode_has_lazy_write(ocf_req_cache_mode_t mode);
 
 bool ocf_fallback_pt_is_on(ocf_cache_t cache);
 

src/metadata/metadata.c

@@ -1609,6 +1609,16 @@ void ocf_metadata_error(struct ocf_cache *cache)
 	cache->device->metadata_error = -1;
 }
 
+typedef void (*ocf_metadata_read_sb_end_t)(
+		struct ocf_metadata_read_sb_ctx *context);
+
+struct ocf_metadata_load_properties_ctx
+{
+	ocf_cache_t cache;
+	ocf_metadata_load_properties_end_t cmpl;
+	void *priv;
+};
+
 static void ocf_metadata_load_properties_cmpl(
 		struct ocf_metadata_read_sb_ctx *context)
 {

src/metadata/metadata_superblock.c

@@ -98,55 +98,115 @@ static void ocf_metadata_store_segment(ocf_pipeline_t pipeline,
 	ocf_pipeline_next(pipeline);
 }
 
-static void ocf_metadata_check_crc_sb_config(ocf_pipeline_t pipeline,
-		void *priv, ocf_pipeline_arg_t arg)
+
+#define ocf_log_invalid_superblock(param) \
+	ocf_log(ctx, log_err, \
+			"Loading %s: invalid %s\n", \
+			ocf_metadata_segment_names[ \
+					metadata_segment_sb_config], \
+			param);
+
+
+int ocf_metadata_validate_superblock(ocf_ctx_t ctx,
+		struct ocf_superblock_config *superblock)
 {
-	struct ocf_metadata_context *context = priv;
-	struct ocf_metadata_ctrl *ctrl;
-	struct ocf_superblock_config *sb_config;
-	ocf_cache_t cache = context->cache;
-	int segment = metadata_segment_sb_config;
 	uint32_t crc;
 
-	ctrl = (struct ocf_metadata_ctrl *)cache->metadata.priv;
-	sb_config = METADATA_MEM_POOL(ctrl, metadata_segment_sb_config);
-
-	crc = env_crc32(0, (void *)sb_config,
-			offsetof(struct ocf_superblock_config, checksum));
-
-	if (crc != sb_config->checksum[segment]) {
-		/* Checksum does not match */
-		ocf_cache_log(cache, log_err,
-				"Loading %s ERROR, invalid checksum\n",
-				ocf_metadata_segment_names[segment]);
-		OCF_PL_FINISH_RET(pipeline, -OCF_ERR_INVAL);
+	if (superblock->magic_number != CACHE_MAGIC_NUMBER) {
+		ocf_log(ctx, log_info, "Cannot detect pre-existing metadata\n");
+		return -OCF_ERR_NO_METADATA;
 	}
 
-	ocf_pipeline_next(pipeline);
+	if (METADATA_VERSION() != superblock->metadata_version) {
+		ocf_log(ctx, log_err, "Metadata version mismatch!\n");
+		return -OCF_ERR_METADATA_VER;
+	}
+
+	crc = env_crc32(0, (void *)superblock,
+			offsetof(struct ocf_superblock_config, checksum));
+
+	if (crc != superblock->checksum[metadata_segment_sb_config]) {
+		ocf_log_invalid_superblock("checksum");
+		return -OCF_ERR_INVAL;
+	}
+
+	if (superblock->clean_shutdown > ocf_metadata_clean_shutdown) {
+		ocf_log_invalid_superblock("shutdown status");
+		return -OCF_ERR_INVAL;
+	}
+
+	if (superblock->dirty_flushed > DIRTY_FLUSHED) {
+		ocf_log_invalid_superblock("flush status");
+		return -OCF_ERR_INVAL;
+	}
+
+	if (superblock->flapping_idx > 1) {
+		ocf_log_invalid_superblock("flapping index");
+		return -OCF_ERR_INVAL;
+	}
+
+	if (superblock->cache_mode < 0 ||
+			superblock->cache_mode >= ocf_cache_mode_max) {
+		ocf_log_invalid_superblock("cache mode");
+		return -OCF_ERR_INVAL;
+	}
+
+	if (env_strnlen(superblock->name, sizeof(superblock->name)) >=
+			OCF_CACHE_NAME_SIZE) {
+		ocf_log_invalid_superblock("name");
+		return -OCF_ERR_INVAL;
+	}
+
+	if (superblock->valid_parts_no > OCF_USER_IO_CLASS_MAX) {
+		ocf_log_invalid_superblock("partition count");
+		return -OCF_ERR_INVAL;
+	}
+
+	if (!ocf_cache_line_size_is_valid(superblock->line_size)) {
+		ocf_log_invalid_superblock("cache line size");
+		return -OCF_ERR_INVAL;
+	}
+
+	if ((unsigned)superblock->metadata_layout >= ocf_metadata_layout_max) {
+		ocf_log_invalid_superblock("metadata layout");
+		return -OCF_ERR_INVAL;
+	}
+
+	if (superblock->core_count > OCF_CORE_MAX) {
+		ocf_log_invalid_superblock("core count");
+		return -OCF_ERR_INVAL;
+	}
+
+	if (superblock->cleaning_policy_type < 0 ||
+			superblock->cleaning_policy_type >= ocf_cleaning_max) {
+		ocf_log_invalid_superblock("cleaning policy");
+		return -OCF_ERR_INVAL;
+	}
+
+	if (superblock->promotion_policy_type < 0 ||
+			superblock->promotion_policy_type >=
+					ocf_promotion_max) {
+		ocf_log_invalid_superblock("promotion policy");
+		return -OCF_ERR_INVAL;
+	}
+
+	return 0;
 }
 
-static void ocf_metadata_load_superblock_post(ocf_pipeline_t pipeline,
+static void _ocf_metadata_validate_superblock(ocf_pipeline_t pipeline,
 		void *priv, ocf_pipeline_arg_t arg)
 {
 	struct ocf_metadata_context *context = priv;
 	struct ocf_metadata_ctrl *ctrl;
-	struct ocf_superblock_config *sb_config;
-	ocf_cache_t cache = context->cache;
+	struct ocf_superblock_config *superblock;
+	int ret;
 
-	ctrl = (struct ocf_metadata_ctrl *)cache->metadata.priv;
-	sb_config = METADATA_MEM_POOL(ctrl, metadata_segment_sb_config);
+	ctrl = (struct ocf_metadata_ctrl *)context->ctrl;
+	superblock = METADATA_MEM_POOL(ctrl, metadata_segment_sb_config);
 
-	if (sb_config->core_count > OCF_CORE_MAX) {
-		ocf_cache_log(cache, log_err,
-			"Loading cache state ERROR, invalid cores count\n");
-		OCF_PL_FINISH_RET(pipeline, -OCF_ERR_INVAL);
-	}
-
-	if (sb_config->valid_parts_no > OCF_USER_IO_CLASS_MAX) {
-		ocf_cache_log(cache, log_err,
-			"Loading cache state ERROR, invalid partition count\n");
-		OCF_PL_FINISH_RET(pipeline, -OCF_ERR_INVAL);
-	}
+	ret = ocf_metadata_validate_superblock(context->cache->owner, superblock);
+	if (ret)
+		OCF_PL_FINISH_RET(pipeline, ret);
 
 	ocf_pipeline_next(pipeline);
 }
@@ -222,12 +282,11 @@ struct ocf_pipeline_properties ocf_metadata_load_sb_pipeline_props = {
 				ocf_metadata_load_sb_store_segment_args),
 		OCF_PL_STEP_ARG_INT(ocf_metadata_load_segment,
 				metadata_segment_sb_config),
-		OCF_PL_STEP(ocf_metadata_check_crc_sb_config),
+		OCF_PL_STEP(_ocf_metadata_validate_superblock),
 		OCF_PL_STEP_FOREACH(ocf_metadata_load_segment,
 				ocf_metadata_load_sb_load_segment_args),
 		OCF_PL_STEP_FOREACH(ocf_metadata_check_crc,
 				ocf_metadata_load_sb_load_segment_args),
-		OCF_PL_STEP(ocf_metadata_load_superblock_post),
 		OCF_PL_STEP_TERMINATOR(),
 	},
 };
@@ -288,12 +347,11 @@ struct ocf_pipeline_properties ocf_metadata_load_sb_recov_pipeline_props = {
 				ocf_metadata_load_sb_store_segment_args),
 		OCF_PL_STEP_ARG_INT(ocf_metadata_load_segment,                                      
 				metadata_segment_sb_config),  
-		OCF_PL_STEP(ocf_metadata_check_crc_sb_config),
+		OCF_PL_STEP(_ocf_metadata_validate_superblock),
 		OCF_PL_STEP_FOREACH(ocf_metadata_load_segment,
 				ocf_metadata_load_sb_recov_load_segment_args),
 		OCF_PL_STEP_FOREACH(ocf_metadata_check_crc,
 				ocf_metadata_load_sb_recov_load_segment_args),
-		OCF_PL_STEP(ocf_metadata_load_superblock_post),
 		OCF_PL_STEP_TERMINATOR(),
 	},
 };
@@ -573,47 +631,6 @@ unsigned ocf_metadata_superblock_get_next_flapping_idx(
 	return (sb->config->flapping_idx + 1) % 2;
 }
 
-int ocf_metadata_validate_superblock(ocf_ctx_t ctx,
-		struct ocf_superblock_config *superblock)
-{
-	if (superblock->magic_number != CACHE_MAGIC_NUMBER) {
-		ocf_log(ctx, log_info, "Cannot detect pre-existing metadata\n");
-		return -OCF_ERR_NO_METADATA;
-	}
-
-	if (METADATA_VERSION() != superblock->metadata_version) {
-		ocf_log(ctx, log_err, "Metadata version mismatch!\n");
-		return -OCF_ERR_METADATA_VER;
-	}
-
-	if (!ocf_cache_line_size_is_valid(superblock->line_size)) {
-		ocf_log(ctx, log_err, "ERROR: Invalid cache line size!\n");
-		return -OCF_ERR_INVAL;
-	}
-
-	if ((unsigned)superblock->metadata_layout >= ocf_metadata_layout_max) {
-		ocf_log(ctx, log_err, "ERROR: Invalid metadata layout!\n");
-		return -OCF_ERR_INVAL;
-	}
-
-	if (superblock->cache_mode >= ocf_cache_mode_max) {
-		ocf_log(ctx, log_err, "ERROR: Invalid cache mode!\n");
-		return -OCF_ERR_INVAL;
-	}
-
-	if (superblock->clean_shutdown > ocf_metadata_clean_shutdown) {
-		ocf_log(ctx, log_err, "ERROR: Invalid shutdown status!\n");
-		return -OCF_ERR_INVAL;
-	}
-
-	if (superblock->dirty_flushed > DIRTY_FLUSHED) {
-		ocf_log(ctx, log_err, "ERROR: Invalid flush status!\n");
-		return -OCF_ERR_INVAL;
-	}
-
-	return 0;
-}
-
 static void ocf_metadata_read_sb_complete(struct ocf_io *io, int error)
 {
 	struct ocf_metadata_read_sb_ctx *context = io->priv1;

src/ocf_cache.c

@@ -39,6 +39,11 @@ int ocf_cache_set_name(ocf_cache_t cache, const char *src, size_t src_size)
 			src, src_size);
 }
 
+bool ocf_cache_mode_is_valid(ocf_cache_mode_t mode)
+{
+	return mode >= ocf_cache_mode_wt && mode < ocf_cache_mode_max;
+}
+
 const char *ocf_cache_get_name(ocf_cache_t cache)
 {
 	OCF_CHECK_NULL(cache);

src/ocf_cache_priv.h

@@ -179,4 +179,6 @@ int ocf_cache_set_name(ocf_cache_t cache, const char *src, size_t src_size);
 
 int ocf_cache_volume_type_init(ocf_ctx_t ctx);
 
+bool ocf_cache_mode_is_valid(ocf_cache_mode_t mode);
+
 #endif /* __OCF_CACHE_PRIV_H__ */