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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, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* 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 2005 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _SYS_SPA_H
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#define _SYS_SPA_H
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#pragma ident "%Z%%M% %I% %E% SMI"
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#include <sys/avl.h>
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#include <sys/zfs_context.h>
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#include <sys/nvpair.h>
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#include <sys/sysmacros.h>
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#include <sys/types.h>
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#include <sys/fs/zfs.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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* Forward references that lots of things need.
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*/
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typedef struct spa spa_t;
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typedef struct vdev vdev_t;
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typedef struct metaslab metaslab_t;
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typedef struct zilog zilog_t;
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typedef struct traverse_handle traverse_handle_t;
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struct dsl_pool;
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/*
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* General-purpose 32-bit and 64-bit bitfield encodings.
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*/
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#define BF32_DECODE(x, low, len) P2PHASE((x) >> (low), 1U << (len))
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#define BF64_DECODE(x, low, len) P2PHASE((x) >> (low), 1ULL << (len))
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#define BF32_ENCODE(x, low, len) (P2PHASE((x), 1U << (len)) << (low))
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#define BF64_ENCODE(x, low, len) (P2PHASE((x), 1ULL << (len)) << (low))
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#define BF32_GET(x, low, len) BF32_DECODE(x, low, len)
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#define BF64_GET(x, low, len) BF64_DECODE(x, low, len)
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#define BF32_SET(x, low, len, val) \
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((x) ^= BF32_ENCODE((x >> low) ^ val, low, len))
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#define BF64_SET(x, low, len, val) \
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((x) ^= BF64_ENCODE((x >> low) ^ val, low, len))
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#define BF32_GET_SB(x, low, len, shift, bias) \
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((BF32_GET(x, low, len) + (bias)) << (shift))
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#define BF64_GET_SB(x, low, len, shift, bias) \
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((BF64_GET(x, low, len) + (bias)) << (shift))
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#define BF32_SET_SB(x, low, len, shift, bias, val) \
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BF32_SET(x, low, len, ((val) >> (shift)) - (bias))
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#define BF64_SET_SB(x, low, len, shift, bias, val) \
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BF64_SET(x, low, len, ((val) >> (shift)) - (bias))
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/*
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* We currently support nine block sizes, from 512 bytes to 128K.
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* We could go higher, but the benefits are near-zero and the cost
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* of COWing a giant block to modify one byte would become excessive.
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*/
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#define SPA_MINBLOCKSHIFT 9
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#define SPA_MAXBLOCKSHIFT 17
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#define SPA_MINBLOCKSIZE (1ULL << SPA_MINBLOCKSHIFT)
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#define SPA_MAXBLOCKSIZE (1ULL << SPA_MAXBLOCKSHIFT)
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#define SPA_BLOCKSIZES (SPA_MAXBLOCKSHIFT - SPA_MINBLOCKSHIFT + 1)
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/*
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* The DVA size encodings for LSIZE and PSIZE support blocks up to 32MB.
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* The ASIZE encoding should be at least 64 times larger (6 more bits)
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* to support up to 4-way RAID-Z mirror mode with worst-case gang block
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* overhead, three DVAs per bp, plus one more bit in case we do anything
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* else that expands the ASIZE.
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*/
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#define SPA_LSIZEBITS 16 /* LSIZE up to 32M (2^16 * 512) */
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#define SPA_PSIZEBITS 16 /* PSIZE up to 32M (2^16 * 512) */
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#define SPA_ASIZEBITS 24 /* ASIZE up to 64 times larger */
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/*
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* All SPA data is represented by 128-bit data virtual addresses (DVAs).
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* The members of the dva_t should be considered opaque outside the SPA.
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*/
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typedef struct dva {
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uint64_t dva_word[2];
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} dva_t;
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/*
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* Each block has a 256-bit checksum -- strong enough for cryptographic hashes.
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*/
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typedef struct zio_cksum {
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uint64_t zc_word[4];
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} zio_cksum_t;
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/*
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* Each block is described by its DVAs, time of birth, checksum, etc.
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* The word-by-word, bit-by-bit layout of the blkptr is as follows:
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*
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* 64 56 48 40 32 24 16 8 0
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* 0 | vdev1 | GRID | ASIZE |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* 1 |G| offset1 |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* 2 | vdev2 | GRID | ASIZE |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* 3 |G| offset2 |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* 4 | vdev3 | GRID | ASIZE |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* 5 |G| offset3 |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* 6 |E| lvl | type | cksum | comp | PSIZE | LSIZE |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* 7 | padding |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* 8 | padding |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* 9 | padding |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* a | birth txg |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* b | fill count |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* c | checksum[0] |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* d | checksum[1] |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* e | checksum[2] |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* f | checksum[3] |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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*
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* Legend:
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*
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* vdev virtual device ID
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* offset offset into virtual device
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* LSIZE logical size
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* PSIZE physical size (after compression)
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* ASIZE allocated size (including RAID-Z parity and gang block headers)
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* GRID RAID-Z layout information (reserved for future use)
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* cksum checksum function
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* comp compression function
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* G gang block indicator
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* E endianness
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* type DMU object type
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* lvl level of indirection
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* birth txg transaction group in which the block was born
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* fill count number of non-zero blocks under this bp
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* checksum[4] 256-bit checksum of the data this bp describes
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*/
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typedef struct blkptr {
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dva_t blk_dva[3]; /* 128-bit Data Virtual Address */
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uint64_t blk_prop; /* size, compression, type, etc */
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uint64_t blk_pad[3]; /* Extra space for the future */
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uint64_t blk_birth; /* transaction group at birth */
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uint64_t blk_fill; /* fill count */
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zio_cksum_t blk_cksum; /* 256-bit checksum */
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} blkptr_t;
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#define SPA_BLKPTRSHIFT 7 /* blkptr_t is 128 bytes */
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#define SPA_DVAS_PER_BP 3 /* Number of DVAs in a bp */
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/*
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* Macros to get and set fields in a bp or DVA.
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*/
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#define DVA_GET_ASIZE(dva) \
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BF64_GET_SB((dva)->dva_word[0], 0, 24, SPA_MINBLOCKSHIFT, 0)
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#define DVA_SET_ASIZE(dva, x) \
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BF64_SET_SB((dva)->dva_word[0], 0, 24, SPA_MINBLOCKSHIFT, 0, x)
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#define DVA_GET_GRID(dva) BF64_GET((dva)->dva_word[0], 24, 8)
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#define DVA_SET_GRID(dva, x) BF64_SET((dva)->dva_word[0], 24, 8, x)
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#define DVA_GET_VDEV(dva) BF64_GET((dva)->dva_word[0], 32, 32)
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#define DVA_SET_VDEV(dva, x) BF64_SET((dva)->dva_word[0], 32, 32, x)
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#define DVA_GET_OFFSET(dva) \
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BF64_GET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0)
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#define DVA_SET_OFFSET(dva, x) \
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BF64_SET_SB((dva)->dva_word[1], 0, 63, SPA_MINBLOCKSHIFT, 0, x)
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#define DVA_GET_GANG(dva) BF64_GET((dva)->dva_word[1], 63, 1)
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#define DVA_SET_GANG(dva, x) BF64_SET((dva)->dva_word[1], 63, 1, x)
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#define BP_GET_LSIZE(bp) \
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(BP_IS_HOLE(bp) ? 0 : \
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BF64_GET_SB((bp)->blk_prop, 0, 16, SPA_MINBLOCKSHIFT, 1))
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#define BP_SET_LSIZE(bp, x) \
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BF64_SET_SB((bp)->blk_prop, 0, 16, SPA_MINBLOCKSHIFT, 1, x)
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#define BP_GET_PSIZE(bp) \
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BF64_GET_SB((bp)->blk_prop, 16, 16, SPA_MINBLOCKSHIFT, 1)
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#define BP_SET_PSIZE(bp, x) \
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BF64_SET_SB((bp)->blk_prop, 16, 16, SPA_MINBLOCKSHIFT, 1, x)
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#define BP_GET_COMPRESS(bp) BF64_GET((bp)->blk_prop, 32, 8)
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#define BP_SET_COMPRESS(bp, x) BF64_SET((bp)->blk_prop, 32, 8, x)
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#define BP_GET_CHECKSUM(bp) BF64_GET((bp)->blk_prop, 40, 8)
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#define BP_SET_CHECKSUM(bp, x) BF64_SET((bp)->blk_prop, 40, 8, x)
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#define BP_GET_TYPE(bp) BF64_GET((bp)->blk_prop, 48, 8)
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#define BP_SET_TYPE(bp, x) BF64_SET((bp)->blk_prop, 48, 8, x)
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#define BP_GET_LEVEL(bp) BF64_GET((bp)->blk_prop, 56, 5)
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#define BP_SET_LEVEL(bp, x) BF64_SET((bp)->blk_prop, 56, 5, x)
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#define BP_GET_BYTEORDER(bp) (0 - BF64_GET((bp)->blk_prop, 63, 1))
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#define BP_SET_BYTEORDER(bp, x) BF64_SET((bp)->blk_prop, 63, 1, x)
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#define BP_GET_ASIZE(bp) \
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(DVA_GET_ASIZE(&(bp)->blk_dva[0]) + DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
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DVA_GET_ASIZE(&(bp)->blk_dva[2]))
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#define DVA_EQUAL(dva1, dva2) \
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((dva1)->dva_word[1] == (dva2)->dva_word[1] && \
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(dva1)->dva_word[0] == (dva2)->dva_word[0])
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#define DVA_IS_VALID(dva) (DVA_GET_ASIZE(dva) != 0)
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#define ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3) \
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{ \
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(zcp)->zc_word[0] = w0; \
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(zcp)->zc_word[1] = w1; \
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(zcp)->zc_word[2] = w2; \
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(zcp)->zc_word[3] = w3; \
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}
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#define BP_IS_HOLE(bp) ((bp)->blk_birth == 0)
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#define BP_IDENTITY(bp) (&(bp)->blk_dva[0])
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#define BP_ZERO(bp) \
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{ \
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(bp)->blk_dva[0].dva_word[0] = 0; \
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(bp)->blk_dva[0].dva_word[1] = 0; \
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(bp)->blk_dva[1].dva_word[0] = 0; \
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(bp)->blk_dva[1].dva_word[1] = 0; \
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(bp)->blk_dva[2].dva_word[0] = 0; \
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(bp)->blk_dva[2].dva_word[1] = 0; \
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(bp)->blk_prop = 0; \
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(bp)->blk_pad[0] = 0; \
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(bp)->blk_pad[1] = 0; \
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(bp)->blk_pad[2] = 0; \
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(bp)->blk_birth = 0; \
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(bp)->blk_fill = 0; \
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ZIO_SET_CHECKSUM(&(bp)->blk_cksum, 0, 0, 0, 0); \
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}
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/*
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* Note: the byteorder is either 0 or -1, both of which are palindromes.
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* This simplifies the endianness handling a bit.
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*/
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#ifdef _BIG_ENDIAN
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#define ZFS_HOST_BYTEORDER (0ULL)
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#else
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#define ZFS_HOST_BYTEORDER (-1ULL)
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#endif
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#define BP_SHOULD_BYTESWAP(bp) (BP_GET_BYTEORDER(bp) != ZFS_HOST_BYTEORDER)
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896
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#define BP_SPRINTF_LEN 256
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789
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#include <sys/dmu.h>
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/*
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* Routines found in spa.c
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*/
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/* state manipulation functions */
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extern int spa_open(const char *pool, spa_t **, void *tag);
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extern int spa_get_stats(const char *pool, nvlist_t **config);
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extern int spa_create(const char *pool, nvlist_t *config, char *altroot);
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extern int spa_import(const char *pool, nvlist_t *config, char *altroot);
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extern nvlist_t *spa_tryimport(nvlist_t *tryconfig);
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extern int spa_destroy(char *pool);
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extern int spa_export(char *pool);
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/* device manipulation */
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extern int spa_vdev_add(spa_t *spa, nvlist_t *nvroot);
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304 |
extern int spa_vdev_add_unlocked(spa_t *spa, nvlist_t *nvroot);
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305 |
extern int spa_vdev_attach(spa_t *spa, const char *path, nvlist_t *nvroot,
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306 |
int replacing);
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307 |
extern int spa_vdev_detach(spa_t *spa, const char *path, uint64_t guid,
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308 |
int replace_done);
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309 |
extern void spa_vdev_replace_done(spa_t *spa);
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310 |
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311 |
/* scrubbing */
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312 |
extern int spa_scrub(spa_t *spa, pool_scrub_type_t type, boolean_t force);
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313 |
extern void spa_scrub_suspend(spa_t *spa);
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314 |
extern void spa_scrub_resume(spa_t *spa);
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315 |
extern void spa_scrub_restart(spa_t *spa, uint64_t txg);
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316 |
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317 |
/* spa syncing */
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318 |
extern void spa_sync(spa_t *spa, uint64_t txg); /* only for DMU use */
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319 |
extern void spa_sync_allpools(void);
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320 |
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321 |
/*
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322 |
* SPA configuration functions in spa_config.c
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323 |
*/
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324 |
extern void spa_config_sync(void);
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325 |
extern void spa_config_load(void);
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326 |
extern nvlist_t *spa_all_configs(uint64_t *);
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327 |
extern void spa_config_set(spa_t *spa, nvlist_t *config);
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328 |
extern nvlist_t *spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg,
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329 |
int getstats);
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330 |
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331 |
/*
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332 |
* Miscellaneous SPA routines in spa_misc.c
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333 |
*/
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334 |
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335 |
/* Namespace manipulation */
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336 |
extern spa_t *spa_lookup(const char *name);
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337 |
extern spa_t *spa_add(const char *name);
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338 |
extern void spa_remove(spa_t *spa);
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339 |
extern spa_t *spa_next(spa_t *prev);
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340 |
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341 |
/* Refcount functions */
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342 |
extern void spa_open_ref(spa_t *spa, void *tag);
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343 |
extern void spa_close(spa_t *spa, void *tag);
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344 |
extern boolean_t spa_refcount_zero(spa_t *spa);
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345 |
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346 |
/* Pool configuration lock */
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347 |
extern void spa_config_enter(spa_t *spa, krw_t rw);
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348 |
extern void spa_config_exit(spa_t *spa);
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349 |
extern boolean_t spa_config_held(spa_t *spa, krw_t rw);
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350 |
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351 |
/* Pool vdev add/remove lock */
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352 |
extern uint64_t spa_vdev_enter(spa_t *spa);
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353 |
extern int spa_vdev_exit(spa_t *spa, vdev_t *vd, uint64_t txg, int error);
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354 |
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355 |
/* Accessor functions */
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356 |
extern krwlock_t *spa_traverse_rwlock(spa_t *spa);
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357 |
extern int spa_traverse_wanted(spa_t *spa);
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358 |
extern struct dsl_pool *spa_get_dsl(spa_t *spa);
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359 |
extern blkptr_t *spa_get_rootblkptr(spa_t *spa);
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360 |
extern void spa_set_rootblkptr(spa_t *spa, const blkptr_t *bp);
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361 |
extern void spa_altroot(spa_t *, char *, size_t);
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362 |
extern int spa_sync_pass(spa_t *spa);
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363 |
extern char *spa_name(spa_t *spa);
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364 |
extern uint64_t spa_guid(spa_t *spa);
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365 |
extern uint64_t spa_last_synced_txg(spa_t *spa);
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366 |
extern uint64_t spa_first_txg(spa_t *spa);
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367 |
extern int spa_state(spa_t *spa);
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368 |
extern uint64_t spa_freeze_txg(spa_t *spa);
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369 |
struct metaslab_class;
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370 |
extern struct metaslab_class *spa_metaslab_class_select(spa_t *spa);
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371 |
extern uint64_t spa_get_alloc(spa_t *spa);
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372 |
extern uint64_t spa_get_space(spa_t *spa);
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373 |
extern uint64_t spa_get_asize(spa_t *spa, uint64_t lsize);
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374 |
extern int spa_busy(void);
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375 |
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376 |
/* Miscellaneous support routines */
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|
377 |
extern int spa_rename(const char *oldname, const char *newname);
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|
378 |
extern boolean_t spa_guid_exists(uint64_t pool_guid, uint64_t device_guid);
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379 |
extern char *spa_strdup(const char *);
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|
380 |
extern void spa_strfree(char *);
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|
381 |
extern uint64_t spa_get_random(uint64_t range);
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896
|
382 |
extern void sprintf_blkptr(char *buf, int len, blkptr_t *bp);
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789
|
383 |
extern void spa_freeze(spa_t *spa);
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|
384 |
extern void spa_evict_all(void);
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385 |
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|
386 |
/* Initialization and termination */
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|
387 |
extern void spa_init(int flags);
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|
388 |
extern void spa_fini(void);
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|
389 |
|
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|
390 |
#ifdef ZFS_DEBUG
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|
391 |
#define dprintf_bp(bp, fmt, ...) do { \
|
|
896
|
392 |
if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
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|
393 |
char __blkbuf[BP_SPRINTF_LEN]; \
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|
394 |
sprintf_blkptr(__blkbuf, BP_SPRINTF_LEN, (bp)); \
|
|
789
|
395 |
dprintf(fmt " %s\n", __VA_ARGS__, __blkbuf); \
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|
396 |
} \
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|
397 |
_NOTE(CONSTCOND) } while (0)
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|
398 |
#else
|
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|
399 |
#define dprintf_bp(bp, fmt, ...)
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|
400 |
#endif
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|
401 |
|
|
|
402 |
extern int spa_mode; /* mode, e.g. FREAD | FWRITE */
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|
403 |
|
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|
404 |
#ifdef __cplusplus
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|
|
405 |
}
|
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|
406 |
#endif
|
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|
407 |
|
|
|
408 |
#endif /* _SYS_SPA_H */
|