| /* |
| * CDDL HEADER START |
| * |
| * This file and its contents are supplied under the terms of the |
| * Common Development and Distribution License ("CDDL"), version 1.0. |
| * You may only use this file in accordance with the terms of version |
| * 1.0 of the CDDL. |
| * |
| * A full copy of the text of the CDDL should have accompanied this |
| * source. A copy of the CDDL is also available via the Internet at |
| * http://www.illumos.org/license/CDDL. |
| * |
| * CDDL HEADER END |
| */ |
| |
| /* |
| * Copyright (c) 2016, 2017 by Delphix. All rights reserved. |
| */ |
| |
| #include <sys/lua/lua.h> |
| #include <sys/lua/lauxlib.h> |
| |
| #include <sys/zcp.h> |
| #include <sys/dsl_dir.h> |
| #include <sys/dsl_pool.h> |
| #include <sys/dsl_prop.h> |
| #include <sys/dsl_synctask.h> |
| #include <sys/dsl_dataset.h> |
| #include <sys/dsl_bookmark.h> |
| #include <sys/dsl_destroy.h> |
| #include <sys/dmu_objset.h> |
| #include <sys/zfs_znode.h> |
| #include <sys/zfeature.h> |
| #include <sys/metaslab.h> |
| |
| #define DST_AVG_BLKSHIFT 14 |
| |
| typedef int (zcp_synctask_func_t)(lua_State *, boolean_t, nvlist_t *); |
| typedef struct zcp_synctask_info { |
| const char *name; |
| zcp_synctask_func_t *func; |
| const zcp_arg_t pargs[4]; |
| const zcp_arg_t kwargs[2]; |
| zfs_space_check_t space_check; |
| int blocks_modified; |
| } zcp_synctask_info_t; |
| |
| /* |
| * Generic synctask interface for channel program syncfuncs. |
| * |
| * To perform some action in syncing context, we'd generally call |
| * dsl_sync_task(), but since the Lua script is already running inside a |
| * synctask we need to leave out some actions (such as acquiring the config |
| * rwlock and performing space checks). |
| * |
| * If 'sync' is false, executes a dry run and returns the error code. |
| * |
| * If we are not running in syncing context and we are not doing a dry run |
| * (meaning we are running a zfs.sync function in open-context) then we |
| * return a Lua error. |
| * |
| * This function also handles common fatal error cases for channel program |
| * library functions. If a fatal error occurs, err_dsname will be the dataset |
| * name reported in error messages, if supplied. |
| */ |
| static int |
| zcp_sync_task(lua_State *state, dsl_checkfunc_t *checkfunc, |
| dsl_syncfunc_t *syncfunc, void *arg, boolean_t sync, const char *err_dsname) |
| { |
| int err; |
| zcp_run_info_t *ri = zcp_run_info(state); |
| |
| err = checkfunc(arg, ri->zri_tx); |
| if (!sync) |
| return (err); |
| |
| if (!ri->zri_sync) { |
| return (luaL_error(state, "running functions from the zfs.sync " |
| "submodule requires passing sync=TRUE to " |
| "lzc_channel_program() (i.e. do not specify the \"-n\" " |
| "command line argument)")); |
| } |
| |
| if (err == 0) { |
| syncfunc(arg, ri->zri_tx); |
| } else if (err == EIO) { |
| if (err_dsname != NULL) { |
| return (luaL_error(state, |
| "I/O error while accessing dataset '%s'", |
| err_dsname)); |
| } else { |
| return (luaL_error(state, |
| "I/O error while accessing dataset.")); |
| } |
| } |
| |
| return (err); |
| } |
| |
| |
| static int zcp_synctask_destroy(lua_State *, boolean_t, nvlist_t *); |
| static zcp_synctask_info_t zcp_synctask_destroy_info = { |
| .name = "destroy", |
| .func = zcp_synctask_destroy, |
| .pargs = { |
| {.za_name = "filesystem | snapshot", .za_lua_type = LUA_TSTRING}, |
| {NULL, 0} |
| }, |
| .kwargs = { |
| {.za_name = "defer", .za_lua_type = LUA_TBOOLEAN}, |
| {NULL, 0} |
| }, |
| .space_check = ZFS_SPACE_CHECK_DESTROY, |
| .blocks_modified = 0 |
| }; |
| |
| /* ARGSUSED */ |
| static int |
| zcp_synctask_destroy(lua_State *state, boolean_t sync, nvlist_t *err_details) |
| { |
| int err; |
| const char *dsname = lua_tostring(state, 1); |
| |
| boolean_t issnap = (strchr(dsname, '@') != NULL); |
| |
| if (!issnap && !lua_isnil(state, 2)) { |
| return (luaL_error(state, |
| "'deferred' kwarg only supported for snapshots: %s", |
| dsname)); |
| } |
| |
| if (issnap) { |
| dsl_destroy_snapshot_arg_t ddsa = { 0 }; |
| ddsa.ddsa_name = dsname; |
| if (!lua_isnil(state, 2)) { |
| ddsa.ddsa_defer = lua_toboolean(state, 2); |
| } else { |
| ddsa.ddsa_defer = B_FALSE; |
| } |
| |
| err = zcp_sync_task(state, dsl_destroy_snapshot_check, |
| dsl_destroy_snapshot_sync, &ddsa, sync, dsname); |
| } else { |
| dsl_destroy_head_arg_t ddha = { 0 }; |
| ddha.ddha_name = dsname; |
| |
| err = zcp_sync_task(state, dsl_destroy_head_check, |
| dsl_destroy_head_sync, &ddha, sync, dsname); |
| } |
| |
| return (err); |
| } |
| |
| static int zcp_synctask_promote(lua_State *, boolean_t, nvlist_t *); |
| static zcp_synctask_info_t zcp_synctask_promote_info = { |
| .name = "promote", |
| .func = zcp_synctask_promote, |
| .pargs = { |
| {.za_name = "clone", .za_lua_type = LUA_TSTRING}, |
| {NULL, 0} |
| }, |
| .kwargs = { |
| {NULL, 0} |
| }, |
| .space_check = ZFS_SPACE_CHECK_RESERVED, |
| .blocks_modified = 3 |
| }; |
| |
| static int |
| zcp_synctask_promote(lua_State *state, boolean_t sync, nvlist_t *err_details) |
| { |
| int err; |
| dsl_dataset_promote_arg_t ddpa = { 0 }; |
| const char *dsname = lua_tostring(state, 1); |
| zcp_run_info_t *ri = zcp_run_info(state); |
| |
| ddpa.ddpa_clonename = dsname; |
| ddpa.err_ds = err_details; |
| ddpa.cr = ri->zri_cred; |
| |
| /* |
| * If there was a snapshot name conflict, then err_ds will be filled |
| * with a list of conflicting snapshot names. |
| */ |
| err = zcp_sync_task(state, dsl_dataset_promote_check, |
| dsl_dataset_promote_sync, &ddpa, sync, dsname); |
| |
| return (err); |
| } |
| |
| static int zcp_synctask_rollback(lua_State *, boolean_t, nvlist_t *err_details); |
| static zcp_synctask_info_t zcp_synctask_rollback_info = { |
| .name = "rollback", |
| .func = zcp_synctask_rollback, |
| .space_check = ZFS_SPACE_CHECK_RESERVED, |
| .blocks_modified = 1, |
| .pargs = { |
| {.za_name = "filesystem", .za_lua_type = LUA_TSTRING}, |
| {0, 0} |
| }, |
| .kwargs = { |
| {0, 0} |
| } |
| }; |
| |
| static int |
| zcp_synctask_rollback(lua_State *state, boolean_t sync, nvlist_t *err_details) |
| { |
| int err; |
| const char *dsname = lua_tostring(state, 1); |
| dsl_dataset_rollback_arg_t ddra = { 0 }; |
| |
| ddra.ddra_fsname = dsname; |
| ddra.ddra_result = err_details; |
| |
| err = zcp_sync_task(state, dsl_dataset_rollback_check, |
| dsl_dataset_rollback_sync, &ddra, sync, dsname); |
| |
| return (err); |
| } |
| |
| static int zcp_synctask_snapshot(lua_State *, boolean_t, nvlist_t *); |
| static zcp_synctask_info_t zcp_synctask_snapshot_info = { |
| .name = "snapshot", |
| .func = zcp_synctask_snapshot, |
| .pargs = { |
| {.za_name = "filesystem@snapname | volume@snapname", |
| .za_lua_type = LUA_TSTRING}, |
| {NULL, 0} |
| }, |
| .kwargs = { |
| {NULL, 0} |
| }, |
| .space_check = ZFS_SPACE_CHECK_NORMAL, |
| .blocks_modified = 3 |
| }; |
| |
| /* ARGSUSED */ |
| static int |
| zcp_synctask_snapshot(lua_State *state, boolean_t sync, nvlist_t *err_details) |
| { |
| int err; |
| dsl_dataset_snapshot_arg_t ddsa = { 0 }; |
| const char *dsname = lua_tostring(state, 1); |
| zcp_run_info_t *ri = zcp_run_info(state); |
| |
| /* |
| * On old pools, the ZIL must not be active when a snapshot is created, |
| * but we can't suspend the ZIL because we're already in syncing |
| * context. |
| */ |
| if (spa_version(ri->zri_pool->dp_spa) < SPA_VERSION_FAST_SNAP) { |
| return (ENOTSUP); |
| } |
| |
| /* |
| * We only allow for a single snapshot rather than a list, so the |
| * error list output is unnecessary. |
| */ |
| ddsa.ddsa_errors = NULL; |
| ddsa.ddsa_props = NULL; |
| ddsa.ddsa_cr = ri->zri_cred; |
| ddsa.ddsa_snaps = fnvlist_alloc(); |
| fnvlist_add_boolean(ddsa.ddsa_snaps, dsname); |
| |
| zcp_cleanup_handler_t *zch = zcp_register_cleanup(state, |
| (zcp_cleanup_t *)&fnvlist_free, ddsa.ddsa_snaps); |
| |
| err = zcp_sync_task(state, dsl_dataset_snapshot_check, |
| dsl_dataset_snapshot_sync, &ddsa, sync, dsname); |
| |
| zcp_deregister_cleanup(state, zch); |
| fnvlist_free(ddsa.ddsa_snaps); |
| |
| return (err); |
| } |
| |
| static int |
| zcp_synctask_wrapper(lua_State *state) |
| { |
| int err; |
| zcp_cleanup_handler_t *zch; |
| int num_ret = 1; |
| nvlist_t *err_details = fnvlist_alloc(); |
| |
| /* |
| * Make sure err_details is properly freed, even if a fatal error is |
| * thrown during the synctask. |
| */ |
| zch = zcp_register_cleanup(state, |
| (zcp_cleanup_t *)&fnvlist_free, err_details); |
| |
| zcp_synctask_info_t *info = lua_touserdata(state, lua_upvalueindex(1)); |
| boolean_t sync = lua_toboolean(state, lua_upvalueindex(2)); |
| |
| zcp_run_info_t *ri = zcp_run_info(state); |
| dsl_pool_t *dp = ri->zri_pool; |
| |
| /* MOS space is triple-dittoed, so we multiply by 3. */ |
| uint64_t funcspace = |
| ((uint64_t)info->blocks_modified << DST_AVG_BLKSHIFT) * 3; |
| |
| zcp_parse_args(state, info->name, info->pargs, info->kwargs); |
| |
| err = 0; |
| if (info->space_check != ZFS_SPACE_CHECK_NONE) { |
| uint64_t quota = dsl_pool_unreserved_space(dp, |
| info->space_check); |
| uint64_t used = dsl_dir_phys(dp->dp_root_dir)->dd_used_bytes + |
| ri->zri_space_used; |
| |
| if (used + funcspace > quota) { |
| err = SET_ERROR(ENOSPC); |
| } |
| } |
| |
| if (err == 0) { |
| err = info->func(state, sync, err_details); |
| } |
| |
| if (err == 0) { |
| ri->zri_space_used += funcspace; |
| } |
| |
| lua_pushnumber(state, (lua_Number)err); |
| if (fnvlist_num_pairs(err_details) > 0) { |
| (void) zcp_nvlist_to_lua(state, err_details, NULL, 0); |
| num_ret++; |
| } |
| |
| zcp_deregister_cleanup(state, zch); |
| fnvlist_free(err_details); |
| |
| return (num_ret); |
| } |
| |
| int |
| zcp_load_synctask_lib(lua_State *state, boolean_t sync) |
| { |
| int i; |
| zcp_synctask_info_t *zcp_synctask_funcs[] = { |
| &zcp_synctask_destroy_info, |
| &zcp_synctask_promote_info, |
| &zcp_synctask_rollback_info, |
| &zcp_synctask_snapshot_info, |
| NULL |
| }; |
| |
| lua_newtable(state); |
| |
| for (i = 0; zcp_synctask_funcs[i] != NULL; i++) { |
| zcp_synctask_info_t *info = zcp_synctask_funcs[i]; |
| lua_pushlightuserdata(state, info); |
| lua_pushboolean(state, sync); |
| lua_pushcclosure(state, &zcp_synctask_wrapper, 2); |
| lua_setfield(state, -2, info->name); |
| info++; |
| } |
| |
| return (1); |
| } |