/* * 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, 2019 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 { /* object number: not needed but kept for backwards compatibility */ uint64_t smp_object; /* length of the object in bytes */ uint64_t smp_length; /* space allocated from the map */ int64_t smp_alloc; /* reserved */ uint64_t smp_pad[5]; /* * 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) * * Note that, if log space map feature is enabled, histograms of * space maps that belong to metaslabs will take into account any * unflushed changes for their metaslabs, even though the actual * space map doesn't have entries for these changes. */ 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 */ 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 * * 2 2 10 50 * +-----+-----+------------+----------------------------------+ * | 1 0 | act | syncpass | txg (lower bits) | * +-----+-----+------------+----------------------------------+ * 63 62 61 60 59 50 49 0 * * * one-word entry * * 1 47 1 15 * +-----------------------------------------------------------+ * | 0 | offset (sm_shift units) | type | run | * +-----------------------------------------------------------+ * 63 62 16 15 14 0 * * * two-word entry * * 2 2 36 24 * +-----+-----+---------------------------+-------------------+ * | 1 1 | pad | run | vdev | * +-----+-----+---------------------------+-------------------+ * 63 62 61 60 59 24 23 0 * * 1 63 * +------+----------------------------------------------------+ * | type | offset | * +------+----------------------------------------------------+ * 63 62 0 * * Note that a two-word entry will not strandle a block boundary. * If necessary, the last word of a block will be padded with a * debug entry (with act = syncpass = txg = 0). */ typedef enum { SM_ALLOC, SM_FREE } maptype_t; typedef struct space_map_entry { maptype_t sme_type; uint32_t sme_vdev; /* max is 2^24-1; SM_NO_VDEVID if not present */ uint64_t sme_offset; /* max is 2^63-1; units of sm_shift */ uint64_t sme_run; /* max is 2^36; units of sm_shift */ } space_map_entry_t; #define SM_NO_VDEVID (1 << SPA_VDEVBITS) /* one-word entry constants */ #define SM_DEBUG_PREFIX 2 #define SM_OFFSET_BITS 47 #define SM_RUN_BITS 15 /* two-word entry constants */ #define SM2_PREFIX 3 #define SM2_OFFSET_BITS 63 #define SM2_RUN_BITS 36 #define SM_PREFIX_DECODE(x) BF64_DECODE(x, 62, 2) #define SM_PREFIX_ENCODE(x) BF64_ENCODE(x, 62, 2) #define SM_DEBUG_ACTION_DECODE(x) BF64_DECODE(x, 60, 2) #define SM_DEBUG_ACTION_ENCODE(x) BF64_ENCODE(x, 60, 2) #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_OFFSET_DECODE(x) BF64_DECODE(x, 16, SM_OFFSET_BITS) #define SM_OFFSET_ENCODE(x) BF64_ENCODE(x, 16, SM_OFFSET_BITS) #define SM_TYPE_DECODE(x) BF64_DECODE(x, 15, 1) #define SM_TYPE_ENCODE(x) BF64_ENCODE(x, 15, 1) #define SM_RUN_DECODE(x) (BF64_DECODE(x, 0, SM_RUN_BITS) + 1) #define SM_RUN_ENCODE(x) BF64_ENCODE((x) - 1, 0, SM_RUN_BITS) #define SM_RUN_MAX SM_RUN_DECODE(~0ULL) #define SM_OFFSET_MAX SM_OFFSET_DECODE(~0ULL) #define SM2_RUN_DECODE(x) (BF64_DECODE(x, SPA_VDEVBITS, SM2_RUN_BITS) + 1) #define SM2_RUN_ENCODE(x) BF64_ENCODE((x) - 1, SPA_VDEVBITS, SM2_RUN_BITS) #define SM2_VDEV_DECODE(x) BF64_DECODE(x, 0, SPA_VDEVBITS) #define SM2_VDEV_ENCODE(x) BF64_ENCODE(x, 0, SPA_VDEVBITS) #define SM2_TYPE_DECODE(x) BF64_DECODE(x, SM2_OFFSET_BITS, 1) #define SM2_TYPE_ENCODE(x) BF64_ENCODE(x, SM2_OFFSET_BITS, 1) #define SM2_OFFSET_DECODE(x) BF64_DECODE(x, 0, SM2_OFFSET_BITS) #define SM2_OFFSET_ENCODE(x) BF64_ENCODE(x, 0, SM2_OFFSET_BITS) #define SM2_RUN_MAX SM2_RUN_DECODE(~0ULL) #define SM2_OFFSET_MAX SM2_OFFSET_DECODE(~0ULL) boolean_t sm_entry_is_debug(uint64_t e); boolean_t sm_entry_is_single_word(uint64_t e); boolean_t sm_entry_is_double_word(uint64_t e); typedef int (*sm_cb_t)(space_map_entry_t *sme, void *arg); int space_map_load(space_map_t *sm, range_tree_t *rt, maptype_t maptype); int space_map_load_length(space_map_t *sm, range_tree_t *rt, maptype_t maptype, uint64_t length); int space_map_iterate(space_map_t *sm, uint64_t length, 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); boolean_t space_map_histogram_verify(space_map_t *sm, range_tree_t *rt); 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); uint64_t space_map_object(space_map_t *sm); int64_t space_map_allocated(space_map_t *sm); uint64_t space_map_length(space_map_t *sm); uint64_t space_map_entries(space_map_t *sm, range_tree_t *rt); uint64_t space_map_nblocks(space_map_t *sm); void space_map_write(space_map_t *sm, range_tree_t *rt, maptype_t maptype, uint64_t vdev_id, dmu_tx_t *tx); uint64_t space_map_estimate_optimal_size(space_map_t *sm, range_tree_t *rt, uint64_t vdev_id); 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); #ifdef __cplusplus } #endif #endif /* _SYS_SPACE_MAP_H */