231 lines
8.1 KiB
C
231 lines
8.1 KiB
C
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2012, 2018 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_SPACE_MAP_H
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#define _SYS_SPACE_MAP_H
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#include <sys/avl.h>
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#include <sys/range_tree.h>
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#include <sys/dmu.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* The size of the space map object has increased to include a histogram.
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* The SPACE_MAP_SIZE_V0 designates the original size and is used to
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* maintain backward compatibility.
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*/
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#define SPACE_MAP_SIZE_V0 (3 * sizeof (uint64_t))
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#define SPACE_MAP_HISTOGRAM_SIZE 32
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/*
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* The space_map_phys is the on-disk representation of the space map.
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* Consumers of space maps should never reference any of the members of this
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* structure directly. These members may only be updated in syncing context.
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*
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* Note the smp_object is no longer used but remains in the structure
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* for backward compatibility.
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*/
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typedef struct space_map_phys {
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/* object number: not needed but kept for backwards compatibility */
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uint64_t smp_object;
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/* length of the object in bytes */
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uint64_t smp_length;
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/* space allocated from the map */
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int64_t smp_alloc;
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/* reserved */
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uint64_t smp_pad[5];
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/*
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* The smp_histogram maintains a histogram of free regions. Each
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* bucket, smp_histogram[i], contains the number of free regions
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* whose size is:
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* 2^(i+sm_shift) <= size of free region in bytes < 2^(i+sm_shift+1)
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*/
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uint64_t smp_histogram[SPACE_MAP_HISTOGRAM_SIZE];
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} space_map_phys_t;
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/*
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* The space map object defines a region of space, its size, how much is
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* allocated, and the on-disk object that stores this information.
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* Consumers of space maps may only access the members of this structure.
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*
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* Note: the space_map may not be accessed concurrently; consumers
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* must provide external locking if required.
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*/
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typedef struct space_map {
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uint64_t sm_start; /* start of map */
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uint64_t sm_size; /* size of map */
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uint8_t sm_shift; /* unit shift */
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objset_t *sm_os; /* objset for this map */
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uint64_t sm_object; /* object id for this map */
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uint32_t sm_blksz; /* block size for space map */
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dmu_buf_t *sm_dbuf; /* space_map_phys_t dbuf */
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space_map_phys_t *sm_phys; /* on-disk space map */
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} space_map_t;
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/*
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* debug entry
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*
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* 2 2 10 50
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* +-----+-----+------------+----------------------------------+
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* | 1 0 | act | syncpass | txg (lower bits) |
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* +-----+-----+------------+----------------------------------+
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* 63 62 61 60 59 50 49 0
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*
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*
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* one-word entry
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*
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* 1 47 1 15
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* +-----------------------------------------------------------+
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* | 0 | offset (sm_shift units) | type | run |
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* +-----------------------------------------------------------+
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* 63 62 16 15 14 0
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*
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*
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* two-word entry
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*
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* 2 2 36 24
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* +-----+-----+---------------------------+-------------------+
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* | 1 1 | pad | run | vdev |
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* +-----+-----+---------------------------+-------------------+
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* 63 62 61 60 59 24 23 0
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*
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* 1 63
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* +------+----------------------------------------------------+
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* | type | offset |
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* +------+----------------------------------------------------+
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* 63 62 0
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*
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* Note that a two-word entry will not straddle a block boundary.
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* If necessary, the last word of a block will be padded with a
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* debug entry (with act = syncpass = txg = 0).
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*/
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typedef enum {
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SM_ALLOC,
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SM_FREE
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} maptype_t;
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typedef struct space_map_entry {
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maptype_t sme_type;
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uint32_t sme_vdev; /* max is 2^24-1; SM_NO_VDEVID if not present */
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uint64_t sme_offset; /* max is 2^63-1; units of sm_shift */
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uint64_t sme_run; /* max is 2^36; units of sm_shift */
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} space_map_entry_t;
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#define SM_NO_VDEVID (1 << SPA_VDEVBITS)
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/* one-word entry constants */
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#define SM_DEBUG_PREFIX 2
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#define SM_OFFSET_BITS 47
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#define SM_RUN_BITS 15
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/* two-word entry constants */
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#define SM2_PREFIX 3
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#define SM2_OFFSET_BITS 63
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#define SM2_RUN_BITS 36
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#define SM_PREFIX_DECODE(x) BF64_DECODE(x, 62, 2)
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#define SM_PREFIX_ENCODE(x) BF64_ENCODE(x, 62, 2)
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#define SM_DEBUG_ACTION_DECODE(x) BF64_DECODE(x, 60, 2)
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#define SM_DEBUG_ACTION_ENCODE(x) BF64_ENCODE(x, 60, 2)
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#define SM_DEBUG_SYNCPASS_DECODE(x) BF64_DECODE(x, 50, 10)
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#define SM_DEBUG_SYNCPASS_ENCODE(x) BF64_ENCODE(x, 50, 10)
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#define SM_DEBUG_TXG_DECODE(x) BF64_DECODE(x, 0, 50)
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#define SM_DEBUG_TXG_ENCODE(x) BF64_ENCODE(x, 0, 50)
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#define SM_OFFSET_DECODE(x) BF64_DECODE(x, 16, SM_OFFSET_BITS)
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#define SM_OFFSET_ENCODE(x) BF64_ENCODE(x, 16, SM_OFFSET_BITS)
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#define SM_TYPE_DECODE(x) BF64_DECODE(x, 15, 1)
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#define SM_TYPE_ENCODE(x) BF64_ENCODE(x, 15, 1)
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#define SM_RUN_DECODE(x) (BF64_DECODE(x, 0, SM_RUN_BITS) + 1)
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#define SM_RUN_ENCODE(x) BF64_ENCODE((x) - 1, 0, SM_RUN_BITS)
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#define SM_RUN_MAX SM_RUN_DECODE(~0ULL)
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#define SM_OFFSET_MAX SM_OFFSET_DECODE(~0ULL)
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#define SM2_RUN_DECODE(x) (BF64_DECODE(x, SPA_VDEVBITS, SM2_RUN_BITS) + 1)
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#define SM2_RUN_ENCODE(x) BF64_ENCODE((x) - 1, SPA_VDEVBITS, SM2_RUN_BITS)
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#define SM2_VDEV_DECODE(x) BF64_DECODE(x, 0, SPA_VDEVBITS)
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#define SM2_VDEV_ENCODE(x) BF64_ENCODE(x, 0, SPA_VDEVBITS)
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#define SM2_TYPE_DECODE(x) BF64_DECODE(x, SM2_OFFSET_BITS, 1)
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#define SM2_TYPE_ENCODE(x) BF64_ENCODE(x, SM2_OFFSET_BITS, 1)
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#define SM2_OFFSET_DECODE(x) BF64_DECODE(x, 0, SM2_OFFSET_BITS)
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#define SM2_OFFSET_ENCODE(x) BF64_ENCODE(x, 0, SM2_OFFSET_BITS)
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#define SM2_RUN_MAX SM2_RUN_DECODE(~0ULL)
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#define SM2_OFFSET_MAX SM2_OFFSET_DECODE(~0ULL)
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boolean_t sm_entry_is_debug(uint64_t e);
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boolean_t sm_entry_is_single_word(uint64_t e);
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boolean_t sm_entry_is_double_word(uint64_t e);
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typedef int (*sm_cb_t)(space_map_entry_t *sme, void *arg);
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int space_map_load(space_map_t *sm, range_tree_t *rt, maptype_t maptype);
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int space_map_load_length(space_map_t *sm, range_tree_t *rt, maptype_t maptype,
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uint64_t length);
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int space_map_iterate(space_map_t *sm, uint64_t length,
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sm_cb_t callback, void *arg);
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int space_map_incremental_destroy(space_map_t *sm, sm_cb_t callback, void *arg,
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dmu_tx_t *tx);
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boolean_t space_map_histogram_verify(space_map_t *sm, range_tree_t *rt);
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void space_map_histogram_clear(space_map_t *sm);
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void space_map_histogram_add(space_map_t *sm, range_tree_t *rt,
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dmu_tx_t *tx);
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uint64_t space_map_object(space_map_t *sm);
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int64_t space_map_allocated(space_map_t *sm);
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uint64_t space_map_length(space_map_t *sm);
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void space_map_write(space_map_t *sm, range_tree_t *rt, maptype_t maptype,
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uint64_t vdev_id, dmu_tx_t *tx);
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uint64_t space_map_estimate_optimal_size(space_map_t *sm, range_tree_t *rt,
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uint64_t vdev_id);
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void space_map_truncate(space_map_t *sm, int blocksize, dmu_tx_t *tx);
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uint64_t space_map_alloc(objset_t *os, int blocksize, dmu_tx_t *tx);
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void space_map_free(space_map_t *sm, dmu_tx_t *tx);
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void space_map_free_obj(objset_t *os, uint64_t smobj, dmu_tx_t *tx);
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int space_map_open(space_map_t **smp, objset_t *os, uint64_t object,
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uint64_t start, uint64_t size, uint8_t shift);
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void space_map_close(space_map_t *sm);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_SPACE_MAP_H */
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