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See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . * * Author: Gris Ge * Todd Gill */ #ifndef _LIB_DMMP_H_ #define _LIB_DMMP_H_ #include #include #ifdef __cplusplus extern "C" { #endif #define DMMP_DLL_EXPORT __attribute__ ((visibility ("default"))) #define DMMP_DLL_LOCAL __attribute__ ((visibility ("hidden"))) #define DMMP_OK 0 #define DMMP_ERR_BUG 1 #define DMMP_ERR_NO_MEMORY 2 #define DMMP_ERR_IPC_TIMEOUT 3 #define DMMP_ERR_IPC_ERROR 4 #define DMMP_ERR_NO_DAEMON 5 #define DMMP_ERR_INCOMPATIBLE 6 #define DMMP_ERR_MPATH_BUSY 7 #define DMMP_ERR_MPATH_NOT_FOUND 8 #define DMMP_ERR_INVALID_ARGUMENT 9 #define DMMP_ERR_PERMISSION_DENY 10 /* * Use the syslog severity level as log priority */ #define DMMP_LOG_PRIORITY_ERROR 3 #define DMMP_LOG_PRIORITY_WARNING 4 #define DMMP_LOG_PRIORITY_INFO 6 #define DMMP_LOG_PRIORITY_DEBUG 7 #define DMMP_LOG_PRIORITY_DEFAULT DMMP_LOG_PRIORITY_WARNING /** * dmmp_log_priority_str() - Convert log priority to string. * * Convert log priority to string (const char *). * * @priority: * int. Log priority. * * Return: * const char *. Valid string are: * * * "ERROR" for DMMP_LOG_PRIORITY_ERROR * * * "WARN " for DMMP_LOG_PRIORITY_WARNING * * * "INFO " for DMMP_LOG_PRIORITY_INFO * * * "DEBUG" for DMMP_LOG_PRIORITY_DEBUG * * * "Invalid argument" for invalid log priority. */ DMMP_DLL_EXPORT const char *dmmp_log_priority_str(int priority); struct DMMP_DLL_EXPORT dmmp_context; struct DMMP_DLL_EXPORT dmmp_mpath; struct DMMP_DLL_EXPORT dmmp_path_group; #define DMMP_PATH_GROUP_STATUS_UNKNOWN 0 #define DMMP_PATH_GROUP_STATUS_ENABLED 1 #define DMMP_PATH_GROUP_STATUS_DISABLED 2 #define DMMP_PATH_GROUP_STATUS_ACTIVE 3 struct DMMP_DLL_EXPORT dmmp_path; #define DMMP_PATH_STATUS_UNKNOWN 0 //#define DMMP_PATH_STATUS_UNCHECKED 1 // ^ print.h does not expose this. #define DMMP_PATH_STATUS_DOWN 2 #define DMMP_PATH_STATUS_UP 3 #define DMMP_PATH_STATUS_SHAKY 4 #define DMMP_PATH_STATUS_GHOST 5 #define DMMP_PATH_STATUS_PENDING 6 #define DMMP_PATH_STATUS_TIMEOUT 7 //#define DMMP_PATH_STATUS_REMOVED 8 // ^ print.h does not expose this. #define DMMP_PATH_STATUS_DELAYED 9 /** * dmmp_strerror() - Convert error code to string. * * Convert error code (int) to string (const char *): * * * DMMP_OK -- "OK" * * * DMMP_ERR_BUG -- "BUG of libdmmp library" * * * DMMP_ERR_NO_MEMORY -- "Out of memory" * * * DMMP_ERR_IPC_TIMEOUT -- "Timeout when communicate with multipathd, * try to set bigger timeout value via dmmp_context_timeout_set ()" * * * DMMP_ERR_IPC_ERROR -- "Error when communicate with multipathd daemon" * * * DMMP_ERR_NO_DAEMON -- "The multipathd daemon not started" * * * DMMP_ERR_INCOMPATIBLE -- "The multipathd daemon version is not * compatible with current library" * * * Other invalid error number -- "Invalid argument" * * @rc: * int. Return code by libdmmp functions. When provided error code is not a * valid error code, return "Invalid argument". * * Return: * const char *. The meaning of provided error code. * */ DMMP_DLL_EXPORT const char *dmmp_strerror(int rc); /** * dmmp_context_new() - Create struct dmmp_context. * * The default logging level (DMMP_LOG_PRIORITY_DEFAULT) is * DMMP_LOG_PRIORITY_WARNING which means only warning and error message will be * forward to log handler function. The default log handler function will print * log message to STDERR, to change so, please use dmmp_context_log_func_set() * to set your own log handler, check manpage libdmmp.h(3) for detail. * * Return: * Pointer of 'struct dmmp_context'. Should be freed by * dmmp_context_free(). */ DMMP_DLL_EXPORT struct dmmp_context *dmmp_context_new(void); /** * dmmp_context_free() - Release the memory of struct dmmp_context. * * Release the memory of struct dmmp_context, but the userdata memory defined * via dmmp_context_userdata_set() will not be touched. * * @ctx: * Pointer of 'struct dmmp_context'. * Return: * void */ DMMP_DLL_EXPORT void dmmp_context_free(struct dmmp_context *ctx); /** * dmmp_context_timeout_set() - Set IPC timeout. * * By default, the IPC to multipathd daemon will timeout after 60 seconds. * * @ctx: * Pointer of 'struct dmmp_context'. * If this pointer is NULL, your program will be terminated by assert. * * @tmo: * Timeout in milliseconds(1 seconds equal 1000 milliseconds). * 0 means infinite, function only return when error or pass. * * Return: * void */ DMMP_DLL_EXPORT void dmmp_context_timeout_set(struct dmmp_context *ctx, unsigned int tmo); /** * dmmp_context_timeout_get() - Get IPC timeout. * * Retrieve timeout value of IPC connection to multipathd daemon. * * @ctx: * Pointer of 'struct dmmp_context'. * If this pointer is NULL, your program will be terminated by assert. * * Return: * unsigned int. Timeout in milliseconds. */ DMMP_DLL_EXPORT unsigned int dmmp_context_timeout_get(struct dmmp_context *ctx); /** * dmmp_context_log_priority_set() - Set log priority. * * * When library generates log message, only equal or more important(less value) * message will be forwarded to log handler function. Valid log priority values * are: * * * DMMP_LOG_PRIORITY_ERROR -- 3 * * * DMMP_LOG_PRIORITY_WARNING -- 4 * * * DMMP_LOG_PRIORITY_INFO -- 5 * * * DMMP_LOG_PRIORITY_DEBUG -- 7 * * @ctx: * Pointer of 'struct dmmp_context'. * If this pointer is NULL, your program will be terminated by assert. * * @priority: * int, log priority. * * Return: * void */ DMMP_DLL_EXPORT void dmmp_context_log_priority_set(struct dmmp_context *ctx, int priority); /** * dmmp_context_log_priority_get() - Get log priority. * * Retrieve current log priority. Valid log priority values are: * * * DMMP_LOG_PRIORITY_ERROR -- 3 * * * DMMP_LOG_PRIORITY_WARNING -- 4 * * * DMMP_LOG_PRIORITY_INFO -- 5 * * * DMMP_LOG_PRIORITY_DEBUG -- 7 * * @ctx: * Pointer of 'struct dmmp_context'. * If this pointer is NULL, your program will be terminated by assert. * * Return: * int, log priority. */ DMMP_DLL_EXPORT int dmmp_context_log_priority_get(struct dmmp_context *ctx); /** * dmmp_context_log_func_set() - Set log handler function. * * Set custom log handler. The log handler will be invoked when log message * is equal or more important(less value) than log priority setting. * Please check manpage libdmmp.h(3) for detail usage. * * @ctx: * Pointer of 'struct dmmp_context'. * If this pointer is NULL, your program will be terminated by assert. * @log_func: * Pointer of log handler function. If set to NULL, all log will be * ignored. * * Return: * void */ DMMP_DLL_EXPORT void dmmp_context_log_func_set (struct dmmp_context *ctx, void (*log_func) (struct dmmp_context *ctx, int priority, const char *file, int line, const char *func_name, const char *format, va_list args)); /** * dmmp_context_userdata_set() - Set user data pointer. * * Store user data pointer into 'struct dmmp_context'. * * @ctx: * Pointer of 'struct dmmp_context'. * If this pointer is NULL, your program will be terminated by assert. * @userdata: * Pointer of user defined data. * * Return: * void */ DMMP_DLL_EXPORT void dmmp_context_userdata_set(struct dmmp_context *ctx, void *userdata); /** * dmmp_context_userdata_get() - Get user data pointer. * * Retrieve user data pointer from 'struct dmmp_context'. * * @ctx: * Pointer of 'struct dmmp_context'. * If this pointer is NULL, your program will be terminated by assert. * * Return: * void *. Pointer of user defined data. */ DMMP_DLL_EXPORT void *dmmp_context_userdata_get(struct dmmp_context *ctx); /** * dmmp_mpath_array_get() - Query all existing multipath devices. * * Query all existing multipath devices and store them into a pointer array. * The memory of 'dmmp_mps' should be freed via dmmp_mpath_array_free(). * * @ctx: * Pointer of 'struct dmmp_context'. * If this pointer is NULL, your program will be terminated by assert. * @dmmp_mps: * Output pointer array of 'struct dmmp_mpath'. * If this pointer is NULL, your program will be terminated by assert. * @dmmp_mp_count: * Output pointer of uint32_t. Hold the size of 'dmmp_mps' pointer array. * If this pointer is NULL, your program will be terminated by assert. * * Return: * int. Valid error codes are: * * * DMMP_OK * * * DMMP_ERR_BUG * * * DMMP_ERR_NO_MEMORY * * * DMMP_ERR_NO_DAEMON * * * DMMP_ERR_INCONSISTENT_DATA * * Error number could be converted to string by dmmp_strerror(). */ DMMP_DLL_EXPORT int dmmp_mpath_array_get(struct dmmp_context *ctx, struct dmmp_mpath ***dmmp_mps, uint32_t *dmmp_mp_count); /** * dmmp_mpath_array_free() - Free 'struct dmmp_mpath' pointer array. * * Free the 'dmmp_mps' pointer array generated by dmmp_mpath_array_get(). * If provided 'dmmp_mps' pointer is NULL or dmmp_mp_count == 0, do nothing. * * @dmmp_mps: * Pointer of 'struct dmmp_mpath' array. * @dmmp_mp_count: * uint32_t, the size of 'dmmp_mps' pointer array. * * Return: * void */ DMMP_DLL_EXPORT void dmmp_mpath_array_free(struct dmmp_mpath **dmmp_mps, uint32_t dmmp_mp_count); /** * dmmp_mpath_wwid_get() - Retrieve WWID of certain mpath. * * @dmmp_mp: * Pointer of 'struct dmmp_mpath'. * If this pointer is NULL, your program will be terminated by assert. * * Return: * const char *. No need to free this memory, the resources will get * freed when dmmp_mpath_array_free(). */ DMMP_DLL_EXPORT const char *dmmp_mpath_wwid_get(struct dmmp_mpath *dmmp_mp); /** * dmmp_mpath_name_get() - Retrieve name(alias) of certain mpath. * * Retrieve the name (also known as alias) of certain mpath. * When the config 'user_friendly_names' been set 'no', the name will be * identical to WWID retrieved by dmmp_mpath_wwid_get(). * * @dmmp_mp: * Pointer of 'struct dmmp_mpath'. * If this pointer is NULL, your program will be terminated by assert. * * Return: * const char *. No need to free this memory, the resources will get * freed when dmmp_mpath_array_free(). */ DMMP_DLL_EXPORT const char *dmmp_mpath_name_get(struct dmmp_mpath *dmmp_mp); /** * dmmp_mpath_kdev_name_get() - Retrieve kernel DEVNAME of certain mpath. * * Retrieve DEVNAME name used by kernel uevent of specified mpath. * For example: 'dm-1'. * * @dmmp_mp: * Pointer of 'struct dmmp_mpath'. * If this pointer is NULL, your program will be terminated by assert. * * Return: * const char *. No need to free this memory, the resources will get * freed when dmmp_mpath_array_free(). */ DMMP_DLL_EXPORT const char *dmmp_mpath_kdev_name_get (struct dmmp_mpath *dmmp_mp); /** * dmmp_path_group_array_get() - Retrieve path groups pointer array. * * Retrieve the path groups of certain mpath. * * The memory of output pointer array is hold by 'struct dmmp_mpath', no * need to free this memory, the resources will got freed when * dmmp_mpath_array_free(). * * @dmmp_mp: * Pointer of 'struct dmmp_mpath'. * If this pointer is NULL, your program will be terminated by assert. * @dmmp_pgs: * Output pointer of 'struct dmmp_path_group' pointer array. * If this pointer is NULL, your program will be terminated by assert. * @dmmp_pg_count: * Output pointer of uint32_t. Hold the size of 'dmmp_pgs' pointer array. * If this pointer is NULL, your program will be terminated by assert. * * Return: * void */ DMMP_DLL_EXPORT void dmmp_path_group_array_get (struct dmmp_mpath *dmmp_mp, struct dmmp_path_group ***dmmp_pgs, uint32_t *dmmp_pg_count); /** * dmmp_path_group_id_get() - Retrieve path group ID. * * Retrieve the path group ID which could be used to switch active path group * via command: * * multipathd -k'switch multipath mpathb group $id' * * @dmmp_pg: * Pointer of 'struct dmmp_path_group'. * If this pointer is NULL, your program will be terminated by assert. * * Return: * uint32_t. */ DMMP_DLL_EXPORT uint32_t dmmp_path_group_id_get (struct dmmp_path_group *dmmp_pg); /** * dmmp_path_group_priority_get() - Retrieve path group priority. * * The enabled path group with highest priority will be next active path group * if active path group down. * * @dmmp_pg: * Pointer of 'struct dmmp_path_group'. * If this pointer is NULL, your program will be terminated by assert. * * Return: * uint32_t. */ DMMP_DLL_EXPORT uint32_t dmmp_path_group_priority_get (struct dmmp_path_group *dmmp_pg); /** * dmmp_path_group_status_get() - Retrieve path group status. * * The valid path group statuses are: * * * DMMP_PATH_GROUP_STATUS_UNKNOWN * * * DMMP_PATH_GROUP_STATUS_ENABLED -- standby to be active * * * DMMP_PATH_GROUP_STATUS_DISABLED -- disabled due to all path down * * * DMMP_PATH_GROUP_STATUS_ACTIVE -- selected to handle I/O * * @dmmp_pg: * Pointer of 'struct dmmp_path_group'. * If this pointer is NULL, your program will be terminated by assert. * * Return: * uint32_t. */ DMMP_DLL_EXPORT uint32_t dmmp_path_group_status_get (struct dmmp_path_group *dmmp_pg); /** * dmmp_path_group_status_str() - Convert path group status to string. * * Convert path group status uint32_t to string (const char *). * * @pg_status: * uint32_t. Path group status. * When provided value is not a valid path group status, return "Invalid * argument". * * Return: * const char *. Valid string are: * * * "Invalid argument" * * * "undef" * * * "enabled" * * * "disabled" * * * "active" */ DMMP_DLL_EXPORT const char *dmmp_path_group_status_str(uint32_t pg_status); /** * dmmp_path_group_selector_get() - Retrieve path group selector. * * Path group selector determine which path in active path group will be * use to next I/O. * * @dmmp_pg: * Pointer of 'struct dmmp_path_group'. * If this pointer is NULL, your program will be terminated by assert. * * Return: * const char *. */ DMMP_DLL_EXPORT const char *dmmp_path_group_selector_get (struct dmmp_path_group *dmmp_pg); /** * dmmp_path_array_get() - Retrieve path pointer array. * * The memory of output pointer array is hold by 'struct dmmp_mpath', no * need to free this memory, the resources will got freed when * dmmp_mpath_array_free(). * * @dmmp_pg: * Pointer of 'struct dmmp_path_group'. * If this pointer is NULL, your program will be terminated by assert. * @dmmp_ps: * Output pointer of 'struct dmmp_path' pointer array. * If this pointer is NULL, your program will be terminated by assert. * @dmmp_p_count: * Output pointer of uint32_t. Hold the size of 'dmmp_ps' pointer array. * If this pointer is NULL, your program will be terminated by assert. * * Return: * void */ DMMP_DLL_EXPORT void dmmp_path_array_get(struct dmmp_path_group *dmmp_pg, struct dmmp_path ***dmmp_ps, uint32_t *dmmp_p_count); /** * dmmp_path_blk_name_get() - Retrieve block name. * * Retrieve block name of certain path. The example of block names are "sda", * "nvme0n1". * * @dmmp_p: * Pointer of 'struct dmmp_path'. * If this pointer is NULL, your program will be terminated by assert. * * Return: * const char *. No need to free this memory, the resources will get * freed when dmmp_mpath_array_free(). */ DMMP_DLL_EXPORT const char *dmmp_path_blk_name_get(struct dmmp_path *dmmp_p); /** * dmmp_path_status_get() - Retrieve the path status. * * The valid path statuses are: * * * DMMP_PATH_STATUS_UNKNOWN * * * DMMP_PATH_STATUS_DOWN * * Path is down and you shouldn't try to send commands to it. * * * DMMP_PATH_STATUS_UP * * Path is up and I/O can be sent to it. * * * DMMP_PATH_STATUS_SHAKY * * Only emc_clariion checker when path not available for "normal" * operations. * * * DMMP_PATH_STATUS_GHOST * * Only hp_sw and rdac checkers. Indicates a "passive/standby" * path on active/passive HP arrays. These paths will return valid * answers to certain SCSI commands (tur, read_capacity, inquiry, * start_stop), but will fail I/O commands. The path needs an * initialization command to be sent to it in order for I/Os to * succeed. * * * DMMP_PATH_STATUS_PENDING * * Available for all async checkers when a check IO is in flight. * * * DMMP_PATH_STATUS_TIMEOUT * * Only tur checker when command timed out. * * * DMMP_PATH_STATUS_DELAYED * * If a path fails after being up for less than delay_watch_checks checks, * when it comes back up again, it will not be marked as up until it has * been up for delay_wait_checks checks. During this time, it is marked as * "delayed". * * @dmmp_p: * Pointer of 'struct dmmp_path'. * If this pointer is NULL, your program will be terminated by assert. * * Return: * uint32_t. */ DMMP_DLL_EXPORT uint32_t dmmp_path_status_get(struct dmmp_path *dmmp_p); /** * dmmp_path_status_str() - Convert path status to string. * * Convert path status uint32_t to string (const char *): * * * DMMP_PATH_STATUS_UNKNOWN -- "undef" * * * DMMP_PATH_STATUS_DOWN -- "faulty" * * * DMMP_PATH_STATUS_UP -- "ready" * * * DMMP_PATH_STATUS_SHAKY -- "shaky" * * * DMMP_PATH_STATUS_GHOST -- "ghost" * * * DMMP_PATH_STATUS_PENDING -- "pending" * * * DMMP_PATH_STATUS_TIMEOUT -- "timeout" * * * DMMP_PATH_STATUS_REMOVED -- "removed" * * * DMMP_PATH_STATUS_DELAYED -- "delayed" * * @path_status: * uint32_t. Path status. * When provided value is not a valid path status, return * "Invalid argument". * * Return: * const char *. The meaning of status value. */ DMMP_DLL_EXPORT const char *dmmp_path_status_str(uint32_t path_status); /** * dmmp_flush_mpath() - Flush specified multipath device map if unused. * * Flush a multipath device map specified as parameter, if unused. * * @ctx: * Pointer of 'struct dmmp_context'. * If this pointer is NULL, your program will be terminated by assert. * @mpath_name: * const char *. The name of multipath device map. * * Return: * int. Valid error codes are: * * * DMMP_OK * * * DMMP_ERR_BUG * * * DMMP_ERR_NO_MEMORY * * * DMMP_ERR_NO_DAEMON * * * DMMP_ERR_MPATH_BUSY * * * DMMP_ERR_MPATH_NOT_FOUND * * * DMMP_ERR_INVALID_ARGUMENT * * * DMMP_ERR_PERMISSION_DENY * * Error number could be converted to string by dmmp_strerror(). */ DMMP_DLL_EXPORT int dmmp_flush_mpath(struct dmmp_context *ctx, const char *mpath_name); /** * dmmp_reconfig() - Instruct multipathd daemon to do reconfiguration. * * Instruct multipathd daemon to do reconfiguration. * * @ctx: * Pointer of 'struct dmmp_context'. * If this pointer is NULL, your program will be terminated by assert. * * Return: * int. Valid error codes are: * * * DMMP_OK * * * DMMP_ERR_BUG * * * DMMP_ERR_NO_MEMORY * * * DMMP_ERR_NO_DAEMON * * * DMMP_ERR_PERMISSION_DENY * * Error number could be converted to string by dmmp_strerror(). */ DMMP_DLL_EXPORT int dmmp_reconfig(struct dmmp_context *ctx); /** * dmmp_last_error_msg() - Retrieves the last error message. * * Retrieves the last error message. * * @ctx: * Pointer of 'struct dmmp_context'. * If this pointer is NULL, your program will be terminated by assert. * * Return: * const char *. No need to free this memory, the resources will get * freed when dmmp_context_free(). */ DMMP_DLL_EXPORT const char *dmmp_last_error_msg(struct dmmp_context *ctx); #ifdef __cplusplus } /* End of extern "C" */ #endif #endif /* End of _LIB_DMMP_H_ */