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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
280 lines
10 KiB
C
280 lines
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
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*/
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/*
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* Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
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*/
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#ifndef ZFS_SPA_HEADER
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#define ZFS_SPA_HEADER 1
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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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* Size of block to hold the configuration data (a packed nvlist)
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*/
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#define SPA_CONFIG_BLOCKSIZE (1 << 14)
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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 |BDX|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 | physical birth txg |
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* +-------+-------+-------+-------+-------+-------+-------+-------+
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* a | logical 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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* B byteorder (endianness)
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* D dedup
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* X unused
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* lvl level of indirection
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* type DMU object type
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* phys birth txg of block allocation; zero if same as logical birth txg
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* log. birth transaction group in which the block was logically 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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#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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typedef struct blkptr {
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dva_t blk_dva[SPA_DVAS_PER_BP]; /* Data Virtual Addresses */
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uint64_t blk_prop; /* size, compression, type, etc */
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uint64_t blk_pad[2]; /* Extra space for the future */
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uint64_t blk_phys_birth; /* txg when block was allocated */
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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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/*
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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_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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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_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_PROP_BIT_61(bp) BF64_GET((bp)->blk_prop, 61, 1)
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#define BP_SET_PROP_BIT_61(bp, x) BF64_SET((bp)->blk_prop, 61, 1, x)
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#define BP_GET_DEDUP(bp) BF64_GET((bp)->blk_prop, 62, 1)
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#define BP_SET_DEDUP(bp, x) BF64_SET((bp)->blk_prop, 62, 1, 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_PHYSICAL_BIRTH(bp) \
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((bp)->blk_phys_birth ? (bp)->blk_phys_birth : (bp)->blk_birth)
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#define BP_SET_BIRTH(bp, logical, physical) \
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{ \
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(bp)->blk_birth = (logical); \
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(bp)->blk_phys_birth = ((logical) == (physical) ? 0 : (physical)); \
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}
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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 BP_GET_UCSIZE(bp) \
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((BP_GET_LEVEL(bp) > 0 || dmu_ot[BP_GET_TYPE(bp)].ot_metadata) ? \
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BP_GET_PSIZE(bp) : BP_GET_LSIZE(bp));
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#define BP_GET_NDVAS(bp) \
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(!!DVA_GET_ASIZE(&(bp)->blk_dva[0]) + \
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!!DVA_GET_ASIZE(&(bp)->blk_dva[1]) + \
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!!DVA_GET_ASIZE(&(bp)->blk_dva[2]))
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#define BP_COUNT_GANG(bp) \
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(DVA_GET_GANG(&(bp)->blk_dva[0]) + \
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DVA_GET_GANG(&(bp)->blk_dva[1]) + \
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DVA_GET_GANG(&(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 BP_EQUAL(bp1, bp2) \
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(BP_PHYSICAL_BIRTH(bp1) == BP_PHYSICAL_BIRTH(bp2) && \
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DVA_EQUAL(&(bp1)->blk_dva[0], &(bp2)->blk_dva[0]) && \
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DVA_EQUAL(&(bp1)->blk_dva[1], &(bp2)->blk_dva[1]) && \
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DVA_EQUAL(&(bp1)->blk_dva[2], &(bp2)->blk_dva[2]))
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#define ZIO_CHECKSUM_EQUAL(zc1, zc2) \
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(0 == (((zc1).zc_word[0] - (zc2).zc_word[0]) | \
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((zc1).zc_word[1] - (zc2).zc_word[1]) | \
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((zc1).zc_word[2] - (zc2).zc_word[2]) | \
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((zc1).zc_word[3] - (zc2).zc_word[3])))
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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_IDENTITY(bp) (&(bp)->blk_dva[0])
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#define BP_IS_GANG(bp) DVA_GET_GANG(BP_IDENTITY(bp))
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#define BP_IS_HOLE(bp) ((bp)->blk_birth == 0)
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/* BP_IS_RAIDZ(bp) assumes no block compression */
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#define BP_IS_RAIDZ(bp) (DVA_GET_ASIZE(&(bp)->blk_dva[0]) > \
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BP_GET_PSIZE(bp))
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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_phys_birth = 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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#define BP_SPRINTF_LEN 320
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#endif /* ! ZFS_SPA_HEADER */
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