1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* 27 * Copyright (c) 2012 by Delphix. All rights reserved. 28 */ 29 30 #ifndef _SYS_SPACE_MAP_H 31 #define _SYS_SPACE_MAP_H 32 33 #include <sys/avl.h> 34 #include <sys/dmu.h> 35 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 typedef struct space_map_ops space_map_ops_t; 41 42 typedef struct space_map { 43 avl_tree_t sm_root; /* offset-ordered segment AVL tree */ 44 uint64_t sm_space; /* sum of all segments in the map */ 45 uint64_t sm_start; /* start of map */ 46 uint64_t sm_size; /* size of map */ 47 uint8_t sm_shift; /* unit shift */ 48 uint8_t sm_loaded; /* map loaded? */ 49 uint8_t sm_loading; /* map loading? */ 50 uint8_t sm_condensing; /* map condensing? */ 51 kcondvar_t sm_load_cv; /* map load completion */ 52 space_map_ops_t *sm_ops; /* space map block picker ops vector */ 53 avl_tree_t *sm_pp_root; /* size-ordered, picker-private tree */ 54 void *sm_ppd; /* picker-private data */ 55 kmutex_t *sm_lock; /* pointer to lock that protects map */ 56 } space_map_t; 57 58 typedef struct space_seg { 59 avl_node_t ss_node; /* AVL node */ 60 avl_node_t ss_pp_node; /* AVL picker-private node */ 61 uint64_t ss_start; /* starting offset of this segment */ 62 uint64_t ss_end; /* ending offset (non-inclusive) */ 63 } space_seg_t; 64 65 typedef struct space_ref { 66 avl_node_t sr_node; /* AVL node */ 67 uint64_t sr_offset; /* offset (start or end) */ 68 int64_t sr_refcnt; /* associated reference count */ 69 } space_ref_t; 70 71 typedef struct space_map_obj { 72 uint64_t smo_object; /* on-disk space map object */ 73 uint64_t smo_objsize; /* size of the object */ 74 uint64_t smo_alloc; /* space allocated from the map */ 75 } space_map_obj_t; 76 77 struct space_map_ops { 78 void (*smop_load)(space_map_t *sm); 79 void (*smop_unload)(space_map_t *sm); 80 uint64_t (*smop_alloc)(space_map_t *sm, uint64_t size); 81 void (*smop_claim)(space_map_t *sm, uint64_t start, uint64_t size); 82 void (*smop_free)(space_map_t *sm, uint64_t start, uint64_t size); 83 uint64_t (*smop_max)(space_map_t *sm); 84 boolean_t (*smop_fragmented)(space_map_t *sm); 85 }; 86 87 /* 88 * debug entry 89 * 90 * 1 3 10 50 91 * ,---+--------+------------+---------------------------------. 92 * | 1 | action | syncpass | txg (lower bits) | 93 * `---+--------+------------+---------------------------------' 94 * 63 62 60 59 50 49 0 95 * 96 * 97 * non-debug entry 98 * 99 * 1 47 1 15 100 * ,-----------------------------------------------------------. 101 * | 0 | offset (sm_shift units) | type | run | 102 * `-----------------------------------------------------------' 103 * 63 62 17 16 15 0 104 */ 105 106 /* All this stuff takes and returns bytes */ 107 #define SM_RUN_DECODE(x) (BF64_DECODE(x, 0, 15) + 1) 108 #define SM_RUN_ENCODE(x) BF64_ENCODE((x) - 1, 0, 15) 109 #define SM_TYPE_DECODE(x) BF64_DECODE(x, 15, 1) 110 #define SM_TYPE_ENCODE(x) BF64_ENCODE(x, 15, 1) 111 #define SM_OFFSET_DECODE(x) BF64_DECODE(x, 16, 47) 112 #define SM_OFFSET_ENCODE(x) BF64_ENCODE(x, 16, 47) 113 #define SM_DEBUG_DECODE(x) BF64_DECODE(x, 63, 1) 114 #define SM_DEBUG_ENCODE(x) BF64_ENCODE(x, 63, 1) 115 116 #define SM_DEBUG_ACTION_DECODE(x) BF64_DECODE(x, 60, 3) 117 #define SM_DEBUG_ACTION_ENCODE(x) BF64_ENCODE(x, 60, 3) 118 119 #define SM_DEBUG_SYNCPASS_DECODE(x) BF64_DECODE(x, 50, 10) 120 #define SM_DEBUG_SYNCPASS_ENCODE(x) BF64_ENCODE(x, 50, 10) 121 122 #define SM_DEBUG_TXG_DECODE(x) BF64_DECODE(x, 0, 50) 123 #define SM_DEBUG_TXG_ENCODE(x) BF64_ENCODE(x, 0, 50) 124 125 #define SM_RUN_MAX SM_RUN_DECODE(~0ULL) 126 127 #define SM_ALLOC 0x0 128 #define SM_FREE 0x1 129 130 /* 131 * The data for a given space map can be kept on blocks of any size. 132 * Larger blocks entail fewer i/o operations, but they also cause the 133 * DMU to keep more data in-core, and also to waste more i/o bandwidth 134 * when only a few blocks have changed since the last transaction group. 135 * This could use a lot more research, but for now, set the freelist 136 * block size to 4k (2^12). 137 */ 138 #define SPACE_MAP_BLOCKSHIFT 12 139 140 typedef void space_map_func_t(space_map_t *sm, uint64_t start, uint64_t size); 141 142 extern void space_map_init(void); 143 extern void space_map_fini(void); 144 extern void space_map_create(space_map_t *sm, uint64_t start, uint64_t size, 145 uint8_t shift, kmutex_t *lp); 146 extern void space_map_destroy(space_map_t *sm); 147 extern void space_map_add(space_map_t *sm, uint64_t start, uint64_t size); 148 extern void space_map_remove(space_map_t *sm, uint64_t start, uint64_t size); 149 extern boolean_t space_map_contains(space_map_t *sm, 150 uint64_t start, uint64_t size); 151 extern space_seg_t *space_map_find(space_map_t *sm, uint64_t start, 152 uint64_t size, avl_index_t *wherep); 153 extern void space_map_swap(space_map_t **msrc, space_map_t **mdest); 154 extern void space_map_vacate(space_map_t *sm, 155 space_map_func_t *func, space_map_t *mdest); 156 extern void space_map_walk(space_map_t *sm, 157 space_map_func_t *func, space_map_t *mdest); 158 159 extern void space_map_load_wait(space_map_t *sm); 160 extern int space_map_load(space_map_t *sm, space_map_ops_t *ops, 161 uint8_t maptype, space_map_obj_t *smo, objset_t *os); 162 extern void space_map_unload(space_map_t *sm); 163 164 extern uint64_t space_map_alloc(space_map_t *sm, uint64_t size); 165 extern void space_map_claim(space_map_t *sm, uint64_t start, uint64_t size); 166 extern void space_map_free(space_map_t *sm, uint64_t start, uint64_t size); 167 extern uint64_t space_map_maxsize(space_map_t *sm); 168 169 extern void space_map_sync(space_map_t *sm, uint8_t maptype, 170 space_map_obj_t *smo, objset_t *os, dmu_tx_t *tx); 171 extern void space_map_truncate(space_map_obj_t *smo, 172 objset_t *os, dmu_tx_t *tx); 173 174 extern void space_map_ref_create(avl_tree_t *t); 175 extern void space_map_ref_destroy(avl_tree_t *t); 176 extern void space_map_ref_add_seg(avl_tree_t *t, 177 uint64_t start, uint64_t end, int64_t refcnt); 178 extern void space_map_ref_add_map(avl_tree_t *t, 179 space_map_t *sm, int64_t refcnt); 180 extern void space_map_ref_generate_map(avl_tree_t *t, 181 space_map_t *sm, int64_t minref); 182 183 #ifdef __cplusplus 184 } 185 #endif 186 187 #endif /* _SYS_SPACE_MAP_H */ 188