/* * 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, 2017 by Delphix. All rights reserved. */ #ifndef _SYS_SPACE_MAP_H #define _SYS_SPACE_MAP_H #include #include #include #ifdef __cplusplus extern "C" { #endif /* * The size of the space map object has increased to include a histogram. * The SPACE_MAP_SIZE_V0 designates the original size and is used to * maintain backward compatibility. */ #define SPACE_MAP_SIZE_V0 (3 * sizeof (uint64_t)) #define SPACE_MAP_HISTOGRAM_SIZE 32 /* * The space_map_phys is the on-disk representation of the space map. * Consumers of space maps should never reference any of the members of this * structure directly. These members may only be updated in syncing context. * * Note the smp_object is no longer used but remains in the structure * for backward compatibility. */ typedef struct space_map_phys { uint64_t smp_object; /* on-disk space map object */ uint64_t smp_objsize; /* size of the object */ int64_t smp_alloc; /* space allocated from the map */ uint64_t smp_pad[5]; /* reserved */ /* * The smp_histogram maintains a histogram of free regions. Each * bucket, smp_histogram[i], contains the number of free regions * whose size is: * 2^(i+sm_shift) <= size of free region in bytes < 2^(i+sm_shift+1) */ uint64_t smp_histogram[SPACE_MAP_HISTOGRAM_SIZE]; } space_map_phys_t; /* * The space map object defines a region of space, its size, how much is * allocated, and the on-disk object that stores this information. * Consumers of space maps may only access the members of this structure. * * Note: the space_map may not be accessed concurrently; consumers * must provide external locking if required. */ typedef struct space_map { uint64_t sm_start; /* start of map */ uint64_t sm_size; /* size of map */ uint8_t sm_shift; /* unit shift */ uint64_t sm_length; /* synced length */ int64_t sm_alloc; /* synced space allocated */ objset_t *sm_os; /* objset for this map */ uint64_t sm_object; /* object id for this map */ uint32_t sm_blksz; /* block size for space map */ dmu_buf_t *sm_dbuf; /* space_map_phys_t dbuf */ space_map_phys_t *sm_phys; /* on-disk space map */ } space_map_t; /* * 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) typedef enum { SM_ALLOC, SM_FREE } maptype_t; typedef int (*sm_cb_t)(maptype_t type, uint64_t offset, uint64_t size, void *arg); int space_map_load(space_map_t *sm, range_tree_t *rt, maptype_t maptype); int space_map_iterate(space_map_t *sm, sm_cb_t callback, void *arg); int space_map_incremental_destroy(space_map_t *sm, sm_cb_t callback, void *arg, dmu_tx_t *tx); void space_map_histogram_clear(space_map_t *sm); void space_map_histogram_add(space_map_t *sm, range_tree_t *rt, dmu_tx_t *tx); void space_map_update(space_map_t *sm); uint64_t space_map_object(space_map_t *sm); uint64_t space_map_allocated(space_map_t *sm); uint64_t space_map_length(space_map_t *sm); void space_map_write(space_map_t *sm, range_tree_t *rt, maptype_t maptype, dmu_tx_t *tx); void space_map_truncate(space_map_t *sm, int blocksize, dmu_tx_t *tx); uint64_t space_map_alloc(objset_t *os, int blocksize, dmu_tx_t *tx); void space_map_free(space_map_t *sm, dmu_tx_t *tx); void space_map_free_obj(objset_t *os, uint64_t smobj, dmu_tx_t *tx); int space_map_open(space_map_t **smp, objset_t *os, uint64_t object, uint64_t start, uint64_t size, uint8_t shift); void space_map_close(space_map_t *sm); int64_t space_map_alloc_delta(space_map_t *sm); #ifdef __cplusplus } #endif #endif /* _SYS_SPACE_MAP_H */