1 /* 2 * CDDL HEADER START 3 * 4 * This file and its contents are supplied under the terms of the 5 * Common Development and Distribution License ("CDDL"), version 1.0. 6 * You may only use this file in accordance with the terms of version 7 * 1.0 of the CDDL. 8 * 9 * A full copy of the text of the CDDL should have accompanied this 10 * source. A copy of the CDDL is also available via the Internet at 11 * http://www.illumos.org/license/CDDL. 12 * 13 * CDDL HEADER END 14 */ 15 16 /* 17 * Copyright (c) 2016, 2018 by Delphix. All rights reserved. 18 */ 19 20 #ifndef _SYS_ZCP_H 21 #define _SYS_ZCP_H 22 23 #include <sys/dmu_tx.h> 24 #include <sys/dsl_pool.h> 25 26 #include <sys/lua/lua.h> 27 #include <sys/lua/lualib.h> 28 #include <sys/lua/lauxlib.h> 29 30 #ifdef __cplusplus 31 extern "C" { 32 #endif 33 34 #define ZCP_RUN_INFO_KEY "runinfo" 35 36 extern uint64_t zfs_lua_max_instrlimit; 37 extern uint64_t zfs_lua_max_memlimit; 38 39 int zcp_argerror(lua_State *, int, const char *, ...); 40 41 int zcp_eval(const char *, const char *, boolean_t, uint64_t, uint64_t, 42 nvpair_t *, nvlist_t *); 43 44 int zcp_load_list_lib(lua_State *); 45 46 int zcp_load_synctask_lib(lua_State *, boolean_t); 47 48 typedef void (zcp_cleanup_t)(void *); 49 typedef struct zcp_cleanup_handler { 50 zcp_cleanup_t *zch_cleanup_func; 51 void *zch_cleanup_arg; 52 list_node_t zch_node; 53 } zcp_cleanup_handler_t; 54 55 typedef struct zcp_alloc_arg { 56 boolean_t aa_must_succeed; 57 int64_t aa_alloc_remaining; 58 int64_t aa_alloc_limit; 59 } zcp_alloc_arg_t; 60 61 typedef struct zcp_run_info { 62 dsl_pool_t *zri_pool; 63 64 /* 65 * An estimate of the total amount of space consumed by all 66 * synctasks we have successfully performed so far in this 67 * channel program. Used to generate ENOSPC errors for syncfuncs. 68 */ 69 int zri_space_used; 70 71 /* 72 * The credentials of the thread which originally invoked the channel 73 * program. Since channel programs are always invoked from the synctask 74 * thread they should always do permissions checks against this cred 75 * rather than the 'current' thread's. 76 */ 77 cred_t *zri_cred; 78 proc_t *zri_proc; 79 80 /* 81 * The tx in which this channel program is running. 82 */ 83 dmu_tx_t *zri_tx; 84 85 /* 86 * The maximum number of Lua instructions the channel program is allowed 87 * to execute. If it takes longer than this it will time out. A value 88 * of 0 indicates no instruction limit. 89 */ 90 uint64_t zri_maxinstrs; 91 92 /* 93 * The number of Lua instructions the channel program has executed. 94 */ 95 uint64_t zri_curinstrs; 96 97 /* 98 * Boolean indicating whether or not the channel program exited 99 * because it timed out. 100 */ 101 boolean_t zri_timed_out; 102 103 /* 104 * Channel program was canceled by user 105 */ 106 boolean_t zri_canceled; 107 108 /* 109 * Boolean indicating whether or not we are running in syncing 110 * context. 111 */ 112 boolean_t zri_sync; 113 114 /* 115 * List of currently registered cleanup handlers, which will be 116 * triggered in the event of a fatal error. 117 */ 118 list_t zri_cleanup_handlers; 119 120 /* 121 * The Lua state context of our channel program. 122 */ 123 lua_State *zri_state; 124 125 /* 126 * Lua memory allocator arguments. 127 */ 128 zcp_alloc_arg_t *zri_allocargs; 129 130 /* 131 * Contains output values from zcp script or error string. 132 */ 133 nvlist_t *zri_outnvl; 134 135 /* 136 * The keys of this nvlist are datasets which may be zvols and may need 137 * to have device minor nodes created. This information is passed from 138 * syncing context (where the zvol is created) to open context (where we 139 * create the minor nodes). 140 */ 141 nvlist_t *zri_new_zvols; 142 143 /* 144 * The errno number returned to caller of zcp_eval(). 145 */ 146 int zri_result; 147 } zcp_run_info_t; 148 149 zcp_run_info_t *zcp_run_info(lua_State *); 150 zcp_cleanup_handler_t *zcp_register_cleanup(lua_State *, zcp_cleanup_t, void *); 151 void zcp_deregister_cleanup(lua_State *, zcp_cleanup_handler_t *); 152 void zcp_cleanup(lua_State *); 153 154 /* 155 * Argument parsing routines for channel program callback functions. 156 */ 157 typedef struct zcp_arg { 158 /* 159 * The name of this argument. For keyword arguments this is the name 160 * functions will use to set the argument. For positional arguments 161 * the name has no programmatic meaning, but will appear in error 162 * messages and help output. 163 */ 164 const char *za_name; 165 166 /* 167 * The Lua type this argument should have (e.g. LUA_TSTRING, 168 * LUA_TBOOLEAN) see the lua_type() function documentation for a 169 * complete list. Calling a function with an argument that does 170 * not match the expected type will result in the program terminating. 171 */ 172 const int za_lua_type; 173 } zcp_arg_t; 174 175 void zcp_parse_args(lua_State *, const char *, const zcp_arg_t *, 176 const zcp_arg_t *); 177 int zcp_nvlist_to_lua(lua_State *, nvlist_t *, char *, int); 178 int zcp_dataset_hold_error(lua_State *, dsl_pool_t *, const char *, int); 179 struct dsl_dataset *zcp_dataset_hold(lua_State *, dsl_pool_t *, 180 const char *, const void *); 181 182 typedef int (zcp_lib_func_t)(lua_State *); 183 typedef struct zcp_lib_info { 184 const char *name; 185 zcp_lib_func_t *func; 186 const zcp_arg_t pargs[4]; 187 const zcp_arg_t kwargs[2]; 188 } zcp_lib_info_t; 189 190 #ifdef __cplusplus 191 } 192 #endif 193 194 #endif /* _SYS_ZCP_H */ 195