/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * Copyright (c) 2012 by Delphix. All rights reserved. */ #ifndef _SYS_SPACE_MAP_H #define _SYS_SPACE_MAP_H #include #include #ifdef __cplusplus extern "C" { #endif typedef const struct space_map_ops space_map_ops_t; typedef struct space_map { avl_tree_t sm_root; /* offset-ordered segment AVL tree */ uint64_t sm_space; /* sum of all segments in the map */ uint64_t sm_start; /* start of map */ uint64_t sm_size; /* size of map */ uint8_t sm_shift; /* unit shift */ uint8_t sm_loaded; /* map loaded? */ uint8_t sm_loading; /* map loading? */ uint8_t sm_condensing; /* map condensing? */ kcondvar_t sm_load_cv; /* map load completion */ space_map_ops_t *sm_ops; /* space map block picker ops vector */ avl_tree_t *sm_pp_root; /* size-ordered, picker-private tree */ void *sm_ppd; /* picker-private data */ kmutex_t *sm_lock; /* pointer to lock that protects map */ } space_map_t; typedef struct space_seg { avl_node_t ss_node; /* AVL node */ avl_node_t ss_pp_node; /* AVL picker-private node */ uint64_t ss_start; /* starting offset of this segment */ uint64_t ss_end; /* ending offset (non-inclusive) */ } space_seg_t; typedef struct space_ref { avl_node_t sr_node; /* AVL node */ uint64_t sr_offset; /* offset (start or end) */ int64_t sr_refcnt; /* associated reference count */ } space_ref_t; typedef struct space_map_obj { uint64_t smo_object; /* on-disk space map object */ uint64_t smo_objsize; /* size of the object */ uint64_t smo_alloc; /* space allocated from the map */ } space_map_obj_t; struct space_map_ops { void (*smop_load)(space_map_t *sm); void (*smop_unload)(space_map_t *sm); uint64_t (*smop_alloc)(space_map_t *sm, uint64_t size); void (*smop_claim)(space_map_t *sm, uint64_t start, uint64_t size); void (*smop_free)(space_map_t *sm, uint64_t start, uint64_t size); uint64_t (*smop_max)(space_map_t *sm); boolean_t (*smop_fragmented)(space_map_t *sm); }; /* * debug entry * * 1 3 10 50 * ,---+--------+------------+---------------------------------. * | 1 | action | syncpass | txg (lower bits) | * `---+--------+------------+---------------------------------' * 63 62 60 59 50 49 0 * * * * non-debug entry * * 1 47 1 15 * ,-----------------------------------------------------------. * | 0 | offset (sm_shift units) | type | run | * `-----------------------------------------------------------' * 63 62 17 16 15 0 */ /* All this stuff takes and returns bytes */ #define SM_RUN_DECODE(x) (BF64_DECODE(x, 0, 15) + 1) #define SM_RUN_ENCODE(x) BF64_ENCODE((x) - 1, 0, 15) #define SM_TYPE_DECODE(x) BF64_DECODE(x, 15, 1) #define SM_TYPE_ENCODE(x) BF64_ENCODE(x, 15, 1) #define SM_OFFSET_DECODE(x) BF64_DECODE(x, 16, 47) #define SM_OFFSET_ENCODE(x) BF64_ENCODE(x, 16, 47) #define SM_DEBUG_DECODE(x) BF64_DECODE(x, 63, 1) #define SM_DEBUG_ENCODE(x) BF64_ENCODE(x, 63, 1) #define SM_DEBUG_ACTION_DECODE(x) BF64_DECODE(x, 60, 3) #define SM_DEBUG_ACTION_ENCODE(x) BF64_ENCODE(x, 60, 3) #define SM_DEBUG_SYNCPASS_DECODE(x) BF64_DECODE(x, 50, 10) #define SM_DEBUG_SYNCPASS_ENCODE(x) BF64_ENCODE(x, 50, 10) #define SM_DEBUG_TXG_DECODE(x) BF64_DECODE(x, 0, 50) #define SM_DEBUG_TXG_ENCODE(x) BF64_ENCODE(x, 0, 50) #define SM_RUN_MAX SM_RUN_DECODE(~0ULL) #define SM_ALLOC 0x0 #define SM_FREE 0x1 /* * The data for a given space map can be kept on blocks of any size. * Larger blocks entail fewer i/o operations, but they also cause the * DMU to keep more data in-core, and also to waste more i/o bandwidth * when only a few blocks have changed since the last transaction group. * This could use a lot more research, but for now, set the freelist * block size to 4k (2^12). */ #define SPACE_MAP_BLOCKSHIFT 12 typedef void space_map_func_t(space_map_t *sm, uint64_t start, uint64_t size); extern void space_map_init(void); extern void space_map_fini(void); extern void space_map_create(space_map_t *sm, uint64_t start, uint64_t size, uint8_t shift, kmutex_t *lp); extern void space_map_destroy(space_map_t *sm); extern void space_map_add(space_map_t *sm, uint64_t start, uint64_t size); extern void space_map_remove(space_map_t *sm, uint64_t start, uint64_t size); extern boolean_t space_map_contains(space_map_t *sm, uint64_t start, uint64_t size); extern space_seg_t *space_map_find(space_map_t *sm, uint64_t start, uint64_t size, avl_index_t *wherep); extern void space_map_swap(space_map_t **msrc, space_map_t **mdest); extern void space_map_vacate(space_map_t *sm, space_map_func_t *func, space_map_t *mdest); extern void space_map_walk(space_map_t *sm, space_map_func_t *func, space_map_t *mdest); extern void space_map_load_wait(space_map_t *sm); extern int space_map_load(space_map_t *sm, space_map_ops_t *ops, uint8_t maptype, space_map_obj_t *smo, objset_t *os); extern void space_map_unload(space_map_t *sm); extern uint64_t space_map_alloc(space_map_t *sm, uint64_t size); extern void space_map_claim(space_map_t *sm, uint64_t start, uint64_t size); extern void space_map_free(space_map_t *sm, uint64_t start, uint64_t size); extern uint64_t space_map_maxsize(space_map_t *sm); extern void space_map_sync(space_map_t *sm, uint8_t maptype, space_map_obj_t *smo, objset_t *os, dmu_tx_t *tx); extern void space_map_truncate(space_map_obj_t *smo, objset_t *os, dmu_tx_t *tx); extern void space_map_ref_create(avl_tree_t *t); extern void space_map_ref_destroy(avl_tree_t *t); extern void space_map_ref_add_seg(avl_tree_t *t, uint64_t start, uint64_t end, int64_t refcnt); extern void space_map_ref_add_map(avl_tree_t *t, space_map_t *sm, int64_t refcnt); extern void space_map_ref_generate_map(avl_tree_t *t, space_map_t *sm, int64_t minref); #ifdef __cplusplus } #endif #endif /* _SYS_SPACE_MAP_H */