509798ea65
This is based on DragonFly's implementation from about 2019-09-13. It only contains the basic code and header information to identify the disks. Relnotes: yes Differential Revision: https://reviews.freebsd.org/D13369
1391 lines
53 KiB
C
1391 lines
53 KiB
C
/*-
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* Copyright (c) 2011-2018 The DragonFly Project. All rights reserved.
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*
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* This code is derived from software contributed to The DragonFly Project
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* by Matthew Dillon <dillon@dragonflybsd.org>
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* by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name of The DragonFly Project nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific, prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _HAMMER2_DISK_H_
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#define _HAMMER2_DISK_H_
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#ifndef _SYS_UUID_H_
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#include <sys/uuid.h>
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#endif
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#ifndef _SYS_DMSG_H_
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/*
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* dmsg_hdr must be 64 bytes
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*/
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struct dmsg_hdr {
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uint16_t magic; /* 00 sanity, synchro, endian */
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uint16_t reserved02; /* 02 */
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uint32_t salt; /* 04 random salt helps w/crypto */
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uint64_t msgid; /* 08 message transaction id */
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uint64_t circuit; /* 10 circuit id or 0 */
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uint64_t reserved18; /* 18 */
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uint32_t cmd; /* 20 flags | cmd | hdr_size / ALIGN */
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uint32_t aux_crc; /* 24 auxillary data crc */
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uint32_t aux_bytes; /* 28 auxillary data length (bytes) */
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uint32_t error; /* 2C error code or 0 */
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uint64_t aux_descr; /* 30 negotiated OOB data descr */
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uint32_t reserved38; /* 38 */
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uint32_t hdr_crc; /* 3C (aligned) extended header crc */
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};
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typedef struct dmsg_hdr dmsg_hdr_t;
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#endif
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/*
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* The structures below represent the on-disk media structures for the HAMMER2
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* filesystem. Note that all fields for on-disk structures are naturally
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* aligned. The host endian format is typically used - compatibility is
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* possible if the implementation detects reversed endian and adjusts accesses
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* accordingly.
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*
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* HAMMER2 primarily revolves around the directory topology: inodes,
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* directory entries, and block tables. Block device buffer cache buffers
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* are always 64KB. Logical file buffers are typically 16KB. All data
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* references utilize 64-bit byte offsets.
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*
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* Free block management is handled independently using blocks reserved by
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* the media topology.
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*/
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/*
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* The data at the end of a file or directory may be a fragment in order
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* to optimize storage efficiency. The minimum fragment size is 1KB.
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* Since allocations are in powers of 2 fragments must also be sized in
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* powers of 2 (1024, 2048, ... 65536).
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*
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* For the moment the maximum allocation size is HAMMER2_PBUFSIZE (64K),
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* which is 2^16. Larger extents may be supported in the future. Smaller
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* fragments might be supported in the future (down to 64 bytes is possible),
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* but probably will not be.
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*
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* A full indirect block use supports 512 x 128-byte blockrefs in a 64KB
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* buffer. Indirect blocks down to 1KB are supported to keep small
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* directories small.
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*
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* A maximally sized file (2^64-1 bytes) requires ~6 indirect block levels
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* using 64KB indirect blocks (128 byte refs, 512 or radix 9 per indblk).
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*
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* 16(datablk) + 9 + 9 + 9 + 9 + 9 + 9 = ~70.
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* 16(datablk) + 7 + 9 + 9 + 9 + 9 + 9 = ~68. (smaller top level indblk)
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*
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* The actual depth depends on copies redundancy and whether the filesystem
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* has chosen to use a smaller indirect block size at the top level or not.
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*/
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#define HAMMER2_ALLOC_MIN 1024 /* minimum allocation size */
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#define HAMMER2_RADIX_MIN 10 /* minimum allocation size 2^N */
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#define HAMMER2_ALLOC_MAX 65536 /* maximum allocation size */
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#define HAMMER2_RADIX_MAX 16 /* maximum allocation size 2^N */
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#define HAMMER2_RADIX_KEY 64 /* number of bits in key */
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/*
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* MINALLOCSIZE - The minimum allocation size. This can be smaller
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* or larger than the minimum physical IO size.
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*
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* NOTE: Should not be larger than 1K since inodes
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* are 1K.
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*
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* MINIOSIZE - The minimum IO size. This must be less than
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* or equal to HAMMER2_LBUFSIZE.
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*
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* HAMMER2_LBUFSIZE - Nominal buffer size for I/O rollups.
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*
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* HAMMER2_PBUFSIZE - Topological block size used by files for all
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* blocks except the block straddling EOF.
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*
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* HAMMER2_SEGSIZE - Allocation map segment size, typically 4MB
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* (space represented by a level0 bitmap).
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*/
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#define HAMMER2_SEGSIZE (1 << HAMMER2_FREEMAP_LEVEL0_RADIX)
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#define HAMMER2_SEGRADIX HAMMER2_FREEMAP_LEVEL0_RADIX
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#define HAMMER2_PBUFRADIX 16 /* physical buf (1<<16) bytes */
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#define HAMMER2_PBUFSIZE 65536
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#define HAMMER2_LBUFRADIX 14 /* logical buf (1<<14) bytes */
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#define HAMMER2_LBUFSIZE 16384
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/*
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* Generally speaking we want to use 16K and 64K I/Os
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*/
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#define HAMMER2_MINIORADIX HAMMER2_LBUFRADIX
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#define HAMMER2_MINIOSIZE HAMMER2_LBUFSIZE
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#define HAMMER2_IND_BYTES_MIN 4096
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#define HAMMER2_IND_BYTES_NOM HAMMER2_LBUFSIZE
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#define HAMMER2_IND_BYTES_MAX HAMMER2_PBUFSIZE
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#define HAMMER2_IND_RADIX_MIN 12
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#define HAMMER2_IND_RADIX_NOM HAMMER2_LBUFRADIX
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#define HAMMER2_IND_RADIX_MAX HAMMER2_PBUFRADIX
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#define HAMMER2_IND_COUNT_MIN (HAMMER2_IND_BYTES_MIN / \
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sizeof(hammer2_blockref_t))
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#define HAMMER2_IND_COUNT_MAX (HAMMER2_IND_BYTES_MAX / \
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sizeof(hammer2_blockref_t))
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/*
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* In HAMMER2, arrays of blockrefs are fully set-associative, meaning that
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* any element can occur at any index and holes can be anywhere. As a
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* future optimization we will be able to flag that such arrays are sorted
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* and thus optimize lookups, but for now we don't.
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*
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* Inodes embed either 512 bytes of direct data or an array of 4 blockrefs,
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* resulting in highly efficient storage for files <= 512 bytes and for files
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* <= 512KB. Up to 4 directory entries can be referenced from a directory
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* without requiring an indirect block.
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*
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* Indirect blocks are typically either 4KB (64 blockrefs / ~4MB represented),
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* or 64KB (1024 blockrefs / ~64MB represented).
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*/
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#define HAMMER2_SET_RADIX 2 /* radix 2 = 4 entries */
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#define HAMMER2_SET_COUNT (1 << HAMMER2_SET_RADIX)
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#define HAMMER2_EMBEDDED_BYTES 512 /* inode blockset/dd size */
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#define HAMMER2_EMBEDDED_RADIX 9
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#define HAMMER2_PBUFMASK (HAMMER2_PBUFSIZE - 1)
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#define HAMMER2_LBUFMASK (HAMMER2_LBUFSIZE - 1)
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#define HAMMER2_SEGMASK (HAMMER2_SEGSIZE - 1)
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#define HAMMER2_LBUFMASK64 ((hammer2_off_t)HAMMER2_LBUFMASK)
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#define HAMMER2_PBUFSIZE64 ((hammer2_off_t)HAMMER2_PBUFSIZE)
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#define HAMMER2_PBUFMASK64 ((hammer2_off_t)HAMMER2_PBUFMASK)
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#define HAMMER2_SEGSIZE64 ((hammer2_off_t)HAMMER2_SEGSIZE)
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#define HAMMER2_SEGMASK64 ((hammer2_off_t)HAMMER2_SEGMASK)
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#define HAMMER2_UUID_STRING "5cbb9ad1-862d-11dc-a94d-01301bb8a9f5"
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/*
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* A 4MB segment is reserved at the beginning of each 2GB zone. This segment
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* contains the volume header (or backup volume header), the free block
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* table, and possibly other information in the future. A 4MB segment for
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* freemap is reserved at the beginning of every 1GB.
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*
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* 4MB = 64 x 64K blocks. Each 4MB segment is broken down as follows:
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*
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* ==========
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* 0 volume header (for the first four 2GB zones)
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* 1 freemap00 level1 FREEMAP_LEAF (256 x 128B bitmap data per 1GB)
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* 2 level2 FREEMAP_NODE (256 x 128B indirect block per 256GB)
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* 3 level3 FREEMAP_NODE (256 x 128B indirect block per 64TB)
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* 4 level4 FREEMAP_NODE (256 x 128B indirect block per 16PB)
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* 5 level5 FREEMAP_NODE (256 x 128B indirect block per 4EB)
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* 6 freemap01 level1 (rotation)
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* 7 level2
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* 8 level3
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* 9 level4
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* 10 level5
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* 11 freemap02 level1 (rotation)
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* 12 level2
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* 13 level3
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* 14 level4
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* 15 level5
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* 16 freemap03 level1 (rotation)
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* 17 level2
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* 18 level3
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* 19 level4
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* 20 level5
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* 21 freemap04 level1 (rotation)
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* 22 level2
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* 23 level3
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* 24 level4
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* 25 level5
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* 26 freemap05 level1 (rotation)
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* 27 level2
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* 28 level3
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* 29 level4
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* 30 level5
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* 31 freemap06 level1 (rotation)
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* 32 level2
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* 33 level3
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* 34 level4
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* 35 level5
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* 36 freemap07 level1 (rotation)
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* 37 level2
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* 38 level3
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* 39 level4
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* 40 level5
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* 41 unused
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* .. unused
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* 63 unused
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* ==========
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*
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* The first four 2GB zones contain volume headers and volume header backups.
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* After that the volume header block# is reserved for future use. Similarly,
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* there are many blocks related to various Freemap levels which are not
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* used in every segment and those are also reserved for future use.
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* Note that each FREEMAP_LEAF or FREEMAP_NODE uses 32KB out of 64KB slot.
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*
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* Freemap (see the FREEMAP document)
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*
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* The freemap utilizes blocks #1-40 in 8 sets of 5 blocks. Each block in
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* a set represents a level of depth in the freemap topology. Eight sets
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* exist to prevent live updates from disturbing the state of the freemap
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* were a crash/reboot to occur. That is, a live update is not committed
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* until the update's flush reaches the volume root. There are FOUR volume
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* roots representing the last four synchronization points, so the freemap
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* must be consistent no matter which volume root is chosen by the mount
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* code.
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*
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* Each freemap set is 5 x 64K blocks and represents the 1GB, 256GB, 64TB,
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* 16PB and 4EB indirect map. The volume header itself has a set of 4 freemap
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* blockrefs representing another 2 bits, giving us a total 64 bits of
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* representable address space.
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*
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* The Level 0 64KB block represents 1GB of storage represented by 32KB
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* (256 x struct hammer2_bmap_data). Each structure represents 4MB of storage
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* and has a 512 bit bitmap, using 2 bits to represent a 16KB chunk of
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* storage. These 2 bits represent the following states:
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*
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* 00 Free
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* 01 (reserved) (Possibly partially allocated)
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* 10 Possibly free
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* 11 Allocated
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*
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* One important thing to note here is that the freemap resolution is 16KB,
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* but the minimum storage allocation size is 1KB. The hammer2 vfs keeps
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* track of sub-allocations in memory, which means that on a unmount or reboot
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* the entire 16KB of a partially allocated block will be considered fully
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* allocated. It is possible for fragmentation to build up over time, but
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* defragmentation is fairly easy to accomplish since all modifications
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* allocate a new block.
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*
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* The Second thing to note is that due to the way snapshots and inode
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* replication works, deleting a file cannot immediately free the related
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* space. Furthermore, deletions often do not bother to traverse the
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* block subhierarchy being deleted. And to go even further, whole
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* sub-directory trees can be deleted simply by deleting the directory inode
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* at the top. So even though we have a symbol to represent a 'possibly free'
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* block (binary 10), only the bulk free scanning code can actually use it.
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* Normal 'rm's or other deletions do not.
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*
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* WARNING! ZONE_SEG and VOLUME_ALIGN must be a multiple of 1<<LEVEL0_RADIX
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* (i.e. a multiple of 4MB). VOLUME_ALIGN must be >= ZONE_SEG.
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*
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* In Summary:
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*
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* (1) Modifications to freemap blocks 'allocate' a new copy (aka use a block
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* from the next set). The new copy is reused until a flush occurs at
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* which point the next modification will then rotate to the next set.
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*/
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#define HAMMER2_VOLUME_ALIGN (8 * 1024 * 1024)
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#define HAMMER2_VOLUME_ALIGN64 ((hammer2_off_t)HAMMER2_VOLUME_ALIGN)
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#define HAMMER2_VOLUME_ALIGNMASK (HAMMER2_VOLUME_ALIGN - 1)
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#define HAMMER2_VOLUME_ALIGNMASK64 ((hammer2_off_t)HAMMER2_VOLUME_ALIGNMASK)
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#define HAMMER2_NEWFS_ALIGN (HAMMER2_VOLUME_ALIGN)
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#define HAMMER2_NEWFS_ALIGN64 ((hammer2_off_t)HAMMER2_VOLUME_ALIGN)
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#define HAMMER2_NEWFS_ALIGNMASK (HAMMER2_VOLUME_ALIGN - 1)
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#define HAMMER2_NEWFS_ALIGNMASK64 ((hammer2_off_t)HAMMER2_NEWFS_ALIGNMASK)
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#define HAMMER2_ZONE_BYTES64 (2LLU * 1024 * 1024 * 1024)
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#define HAMMER2_ZONE_MASK64 (HAMMER2_ZONE_BYTES64 - 1)
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#define HAMMER2_ZONE_SEG (4 * 1024 * 1024)
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#define HAMMER2_ZONE_SEG64 ((hammer2_off_t)HAMMER2_ZONE_SEG)
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#define HAMMER2_ZONE_BLOCKS_SEG (HAMMER2_ZONE_SEG / HAMMER2_PBUFSIZE)
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#define HAMMER2_ZONE_FREEMAP_INC 5 /* 5 deep */
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#define HAMMER2_ZONE_VOLHDR 0 /* volume header or backup */
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#define HAMMER2_ZONE_FREEMAP_00 1 /* normal freemap rotation */
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#define HAMMER2_ZONE_FREEMAP_01 6 /* normal freemap rotation */
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#define HAMMER2_ZONE_FREEMAP_02 11 /* normal freemap rotation */
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#define HAMMER2_ZONE_FREEMAP_03 16 /* normal freemap rotation */
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#define HAMMER2_ZONE_FREEMAP_04 21 /* normal freemap rotation */
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#define HAMMER2_ZONE_FREEMAP_05 26 /* normal freemap rotation */
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#define HAMMER2_ZONE_FREEMAP_06 31 /* normal freemap rotation */
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#define HAMMER2_ZONE_FREEMAP_07 36 /* normal freemap rotation */
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#define HAMMER2_ZONE_FREEMAP_END 41 /* (non-inclusive) */
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#define HAMMER2_ZONE_UNUSED41 41
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#define HAMMER2_ZONE_UNUSED42 42
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#define HAMMER2_ZONE_UNUSED43 43
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#define HAMMER2_ZONE_UNUSED44 44
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#define HAMMER2_ZONE_UNUSED45 45
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#define HAMMER2_ZONE_UNUSED46 46
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#define HAMMER2_ZONE_UNUSED47 47
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#define HAMMER2_ZONE_UNUSED48 48
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#define HAMMER2_ZONE_UNUSED49 49
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#define HAMMER2_ZONE_UNUSED50 50
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#define HAMMER2_ZONE_UNUSED51 51
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#define HAMMER2_ZONE_UNUSED52 52
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#define HAMMER2_ZONE_UNUSED53 53
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#define HAMMER2_ZONE_UNUSED54 54
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#define HAMMER2_ZONE_UNUSED55 55
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#define HAMMER2_ZONE_UNUSED56 56
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#define HAMMER2_ZONE_UNUSED57 57
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#define HAMMER2_ZONE_UNUSED58 58
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#define HAMMER2_ZONE_UNUSED59 59
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#define HAMMER2_ZONE_UNUSED60 60
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#define HAMMER2_ZONE_UNUSED61 61
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#define HAMMER2_ZONE_UNUSED62 62
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#define HAMMER2_ZONE_UNUSED63 63
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#define HAMMER2_ZONE_END 64 /* non-inclusive */
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#define HAMMER2_NFREEMAPS 8 /* FREEMAP_00 - FREEMAP_07 */
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/* relative to FREEMAP_x */
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#define HAMMER2_ZONEFM_LEVEL1 0 /* 1GB leafmap */
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#define HAMMER2_ZONEFM_LEVEL2 1 /* 256GB indmap */
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#define HAMMER2_ZONEFM_LEVEL3 2 /* 64TB indmap */
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#define HAMMER2_ZONEFM_LEVEL4 3 /* 16PB indmap */
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#define HAMMER2_ZONEFM_LEVEL5 4 /* 4EB indmap */
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/* LEVEL6 is a set of 4 blockrefs in the volume header 16EB */
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/*
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* Freemap radix. Assumes a set-count of 4, 128-byte blockrefs,
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* 32KB indirect block for freemap (LEVELN_PSIZE below).
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*
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* Leaf entry represents 4MB of storage broken down into a 512-bit
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* bitmap, 2-bits per entry. So course bitmap item represents 16KB.
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*/
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#if HAMMER2_SET_COUNT != 4
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#error "hammer2_disk.h - freemap assumes SET_COUNT is 4"
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#endif
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#define HAMMER2_FREEMAP_LEVEL6_RADIX 64 /* 16EB (end) */
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#define HAMMER2_FREEMAP_LEVEL5_RADIX 62 /* 4EB */
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#define HAMMER2_FREEMAP_LEVEL4_RADIX 54 /* 16PB */
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#define HAMMER2_FREEMAP_LEVEL3_RADIX 46 /* 64TB */
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#define HAMMER2_FREEMAP_LEVEL2_RADIX 38 /* 256GB */
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#define HAMMER2_FREEMAP_LEVEL1_RADIX 30 /* 1GB */
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#define HAMMER2_FREEMAP_LEVEL0_RADIX 22 /* 4MB (128by in l-1 leaf) */
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#define HAMMER2_FREEMAP_LEVELN_PSIZE 32768 /* physical bytes */
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#define HAMMER2_FREEMAP_LEVEL5_SIZE ((hammer2_off_t)1 << \
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HAMMER2_FREEMAP_LEVEL5_RADIX)
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#define HAMMER2_FREEMAP_LEVEL4_SIZE ((hammer2_off_t)1 << \
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HAMMER2_FREEMAP_LEVEL4_RADIX)
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#define HAMMER2_FREEMAP_LEVEL3_SIZE ((hammer2_off_t)1 << \
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HAMMER2_FREEMAP_LEVEL3_RADIX)
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#define HAMMER2_FREEMAP_LEVEL2_SIZE ((hammer2_off_t)1 << \
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HAMMER2_FREEMAP_LEVEL2_RADIX)
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#define HAMMER2_FREEMAP_LEVEL1_SIZE ((hammer2_off_t)1 << \
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HAMMER2_FREEMAP_LEVEL1_RADIX)
|
|
#define HAMMER2_FREEMAP_LEVEL0_SIZE ((hammer2_off_t)1 << \
|
|
HAMMER2_FREEMAP_LEVEL0_RADIX)
|
|
|
|
#define HAMMER2_FREEMAP_LEVEL5_MASK (HAMMER2_FREEMAP_LEVEL5_SIZE - 1)
|
|
#define HAMMER2_FREEMAP_LEVEL4_MASK (HAMMER2_FREEMAP_LEVEL4_SIZE - 1)
|
|
#define HAMMER2_FREEMAP_LEVEL3_MASK (HAMMER2_FREEMAP_LEVEL3_SIZE - 1)
|
|
#define HAMMER2_FREEMAP_LEVEL2_MASK (HAMMER2_FREEMAP_LEVEL2_SIZE - 1)
|
|
#define HAMMER2_FREEMAP_LEVEL1_MASK (HAMMER2_FREEMAP_LEVEL1_SIZE - 1)
|
|
#define HAMMER2_FREEMAP_LEVEL0_MASK (HAMMER2_FREEMAP_LEVEL0_SIZE - 1)
|
|
|
|
#define HAMMER2_FREEMAP_COUNT (int)(HAMMER2_FREEMAP_LEVELN_PSIZE / \
|
|
sizeof(hammer2_bmap_data_t))
|
|
|
|
/*
|
|
* XXX I made a mistake and made the reserved area begin at each LEVEL1 zone,
|
|
* which is on a 1GB demark. This will eat a little more space but for
|
|
* now we retain compatibility and make FMZONEBASE every 1GB
|
|
*/
|
|
#define H2FMZONEBASE(key) ((key) & ~HAMMER2_FREEMAP_LEVEL1_MASK)
|
|
#define H2FMBASE(key, radix) ((key) & ~(((hammer2_off_t)1 << (radix)) - 1))
|
|
|
|
/*
|
|
* 16KB bitmap granularity (x2 bits per entry).
|
|
*/
|
|
#define HAMMER2_FREEMAP_BLOCK_RADIX 14
|
|
#define HAMMER2_FREEMAP_BLOCK_SIZE (1 << HAMMER2_FREEMAP_BLOCK_RADIX)
|
|
#define HAMMER2_FREEMAP_BLOCK_MASK (HAMMER2_FREEMAP_BLOCK_SIZE - 1)
|
|
|
|
/*
|
|
* bitmap[] structure. 2 bits per HAMMER2_FREEMAP_BLOCK_SIZE.
|
|
*
|
|
* 8 x 64-bit elements, 2 bits per block.
|
|
* 32 blocks (radix 5) per element.
|
|
* representing INDEX_SIZE bytes worth of storage per element.
|
|
*/
|
|
|
|
typedef uint64_t hammer2_bitmap_t;
|
|
|
|
#define HAMMER2_BMAP_ALLONES ((hammer2_bitmap_t)-1)
|
|
#define HAMMER2_BMAP_ELEMENTS 8
|
|
#define HAMMER2_BMAP_BITS_PER_ELEMENT 64
|
|
#define HAMMER2_BMAP_INDEX_RADIX 5 /* 32 blocks per element */
|
|
#define HAMMER2_BMAP_BLOCKS_PER_ELEMENT (1 << HAMMER2_BMAP_INDEX_RADIX)
|
|
|
|
#define HAMMER2_BMAP_INDEX_SIZE (HAMMER2_FREEMAP_BLOCK_SIZE * \
|
|
HAMMER2_BMAP_BLOCKS_PER_ELEMENT)
|
|
#define HAMMER2_BMAP_INDEX_MASK (HAMMER2_BMAP_INDEX_SIZE - 1)
|
|
|
|
#define HAMMER2_BMAP_SIZE (HAMMER2_BMAP_INDEX_SIZE * \
|
|
HAMMER2_BMAP_ELEMENTS)
|
|
#define HAMMER2_BMAP_MASK (HAMMER2_BMAP_SIZE - 1)
|
|
|
|
/*
|
|
* Two linear areas can be reserved after the initial 4MB segment in the base
|
|
* zone (the one starting at offset 0). These areas are NOT managed by the
|
|
* block allocator and do not fall under HAMMER2 crc checking rules based
|
|
* at the volume header (but can be self-CRCd internally, depending).
|
|
*/
|
|
#define HAMMER2_BOOT_MIN_BYTES HAMMER2_VOLUME_ALIGN
|
|
#define HAMMER2_BOOT_NOM_BYTES (64*1024*1024)
|
|
#define HAMMER2_BOOT_MAX_BYTES (256*1024*1024)
|
|
|
|
#define HAMMER2_REDO_MIN_BYTES HAMMER2_VOLUME_ALIGN
|
|
#define HAMMER2_REDO_NOM_BYTES (256*1024*1024)
|
|
#define HAMMER2_REDO_MAX_BYTES (1024*1024*1024)
|
|
|
|
/*
|
|
* Most HAMMER2 types are implemented as unsigned 64-bit integers.
|
|
* Transaction ids are monotonic.
|
|
*
|
|
* We utilize 32-bit iSCSI CRCs.
|
|
*/
|
|
typedef uint64_t hammer2_tid_t;
|
|
typedef uint64_t hammer2_off_t;
|
|
typedef uint64_t hammer2_key_t;
|
|
typedef uint32_t hammer2_crc32_t;
|
|
|
|
/*
|
|
* Miscellanious ranges (all are unsigned).
|
|
*/
|
|
#define HAMMER2_TID_MIN 1ULL
|
|
#define HAMMER2_TID_MAX 0xFFFFFFFFFFFFFFFFULL
|
|
#define HAMMER2_KEY_MIN 0ULL
|
|
#define HAMMER2_KEY_MAX 0xFFFFFFFFFFFFFFFFULL
|
|
#define HAMMER2_OFFSET_MIN 0ULL
|
|
#define HAMMER2_OFFSET_MAX 0xFFFFFFFFFFFFFFFFULL
|
|
|
|
/*
|
|
* HAMMER2 data offset special cases and masking.
|
|
*
|
|
* All HAMMER2 data offsets have to be broken down into a 64K buffer base
|
|
* offset (HAMMER2_OFF_MASK_HI) and a 64K buffer index (HAMMER2_OFF_MASK_LO).
|
|
*
|
|
* Indexes into physical buffers are always 64-byte aligned. The low 6 bits
|
|
* of the data offset field specifies how large the data chunk being pointed
|
|
* to as a power of 2. The theoretical minimum radix is thus 6 (The space
|
|
* needed in the low bits of the data offset field). However, the practical
|
|
* minimum allocation chunk size is 1KB (a radix of 10), so HAMMER2 sets
|
|
* HAMMER2_RADIX_MIN to 10. The maximum radix is currently 16 (64KB), but
|
|
* we fully intend to support larger extents in the future.
|
|
*
|
|
* WARNING! A radix of 0 (such as when data_off is all 0's) is a special
|
|
* case which means no data associated with the blockref, and
|
|
* not the '1 byte' it would otherwise calculate to.
|
|
*/
|
|
#define HAMMER2_OFF_BAD ((hammer2_off_t)-1)
|
|
#define HAMMER2_OFF_MASK 0xFFFFFFFFFFFFFFC0ULL
|
|
#define HAMMER2_OFF_MASK_LO (HAMMER2_OFF_MASK & HAMMER2_PBUFMASK64)
|
|
#define HAMMER2_OFF_MASK_HI (~HAMMER2_PBUFMASK64)
|
|
#define HAMMER2_OFF_MASK_RADIX 0x000000000000003FULL
|
|
#define HAMMER2_MAX_COPIES 6
|
|
|
|
/*
|
|
* HAMMER2 directory support and pre-defined keys
|
|
*/
|
|
#define HAMMER2_DIRHASH_VISIBLE 0x8000000000000000ULL
|
|
#define HAMMER2_DIRHASH_USERMSK 0x7FFFFFFFFFFFFFFFULL
|
|
#define HAMMER2_DIRHASH_LOMASK 0x0000000000007FFFULL
|
|
#define HAMMER2_DIRHASH_HIMASK 0xFFFFFFFFFFFF0000ULL
|
|
#define HAMMER2_DIRHASH_FORCED 0x0000000000008000ULL /* bit forced on */
|
|
|
|
#define HAMMER2_SROOT_KEY 0x0000000000000000ULL /* volume to sroot */
|
|
#define HAMMER2_BOOT_KEY 0xd9b36ce135528000ULL /* sroot to BOOT PFS */
|
|
|
|
/************************************************************************
|
|
* DMSG SUPPORT *
|
|
************************************************************************
|
|
* LNK_VOLCONF
|
|
*
|
|
* All HAMMER2 directories directly under the super-root on your local
|
|
* media can be mounted separately, even if they share the same physical
|
|
* device.
|
|
*
|
|
* When you do a HAMMER2 mount you are effectively tying into a HAMMER2
|
|
* cluster via local media. The local media does not have to participate
|
|
* in the cluster, other than to provide the hammer2_volconf[] array and
|
|
* root inode for the mount.
|
|
*
|
|
* This is important: The mount device path you specify serves to bootstrap
|
|
* your entry into the cluster, but your mount will make active connections
|
|
* to ALL copy elements in the hammer2_volconf[] array which match the
|
|
* PFSID of the directory in the super-root that you specified. The local
|
|
* media path does not have to be mentioned in this array but becomes part
|
|
* of the cluster based on its type and access rights. ALL ELEMENTS ARE
|
|
* TREATED ACCORDING TO TYPE NO MATTER WHICH ONE YOU MOUNT FROM.
|
|
*
|
|
* The actual cluster may be far larger than the elements you list in the
|
|
* hammer2_volconf[] array. You list only the elements you wish to
|
|
* directly connect to and you are able to access the rest of the cluster
|
|
* indirectly through those connections.
|
|
*
|
|
* WARNING! This structure must be exactly 128 bytes long for its config
|
|
* array to fit in the volume header.
|
|
*/
|
|
struct hammer2_volconf {
|
|
uint8_t copyid; /* 00 copyid 0-255 (must match slot) */
|
|
uint8_t inprog; /* 01 operation in progress, or 0 */
|
|
uint8_t chain_to; /* 02 operation chaining to, or 0 */
|
|
uint8_t chain_from; /* 03 operation chaining from, or 0 */
|
|
uint16_t flags; /* 04-05 flags field */
|
|
uint8_t error; /* 06 last operational error */
|
|
uint8_t priority; /* 07 priority and round-robin flag */
|
|
uint8_t remote_pfs_type;/* 08 probed direct remote PFS type */
|
|
uint8_t reserved08[23]; /* 09-1F */
|
|
uuid_t pfs_clid; /* 20-2F copy target must match this uuid */
|
|
uint8_t label[16]; /* 30-3F import/export label */
|
|
uint8_t path[64]; /* 40-7F target specification string or key */
|
|
} __packed;
|
|
|
|
typedef struct hammer2_volconf hammer2_volconf_t;
|
|
|
|
#define DMSG_VOLF_ENABLED 0x0001
|
|
#define DMSG_VOLF_INPROG 0x0002
|
|
#define DMSG_VOLF_CONN_RR 0x80 /* round-robin at same priority */
|
|
#define DMSG_VOLF_CONN_EF 0x40 /* media errors flagged */
|
|
#define DMSG_VOLF_CONN_PRI 0x0F /* select priority 0-15 (15=best) */
|
|
|
|
struct dmsg_lnk_hammer2_volconf {
|
|
dmsg_hdr_t head;
|
|
hammer2_volconf_t copy; /* copy spec */
|
|
int32_t index;
|
|
int32_t unused01;
|
|
uuid_t mediaid;
|
|
int64_t reserved02[32];
|
|
} __packed;
|
|
|
|
typedef struct dmsg_lnk_hammer2_volconf dmsg_lnk_hammer2_volconf_t;
|
|
|
|
#define DMSG_LNK_HAMMER2_VOLCONF DMSG_LNK(DMSG_LNK_CMD_HAMMER2_VOLCONF, \
|
|
dmsg_lnk_hammer2_volconf)
|
|
|
|
#define H2_LNK_VOLCONF(msg) ((dmsg_lnk_hammer2_volconf_t *)(msg)->any.buf)
|
|
|
|
/*
|
|
* HAMMER2 directory entry header (embedded in blockref) exactly 16 bytes
|
|
*/
|
|
struct hammer2_dirent_head {
|
|
hammer2_tid_t inum; /* inode number */
|
|
uint16_t namlen; /* name length */
|
|
uint8_t type; /* OBJTYPE_* */
|
|
uint8_t unused0B;
|
|
uint8_t unused0C[4];
|
|
} __packed;
|
|
|
|
typedef struct hammer2_dirent_head hammer2_dirent_head_t;
|
|
|
|
/*
|
|
* The media block reference structure. This forms the core of the HAMMER2
|
|
* media topology recursion. This 128-byte data structure is embedded in the
|
|
* volume header, in inodes (which are also directory entries), and in
|
|
* indirect blocks.
|
|
*
|
|
* A blockref references a single media item, which typically can be a
|
|
* directory entry (aka inode), indirect block, or data block.
|
|
*
|
|
* The primary feature a blockref represents is the ability to validate
|
|
* the entire tree underneath it via its check code. Any modification to
|
|
* anything propagates up the blockref tree all the way to the root, replacing
|
|
* the related blocks and compounding the generated check code.
|
|
*
|
|
* The check code can be a simple 32-bit iscsi code, a 64-bit crc, or as
|
|
* complex as a 512 bit cryptographic hash. I originally used a 64-byte
|
|
* blockref but later expanded it to 128 bytes to be able to support the
|
|
* larger check code as well as to embed statistics for quota operation.
|
|
*
|
|
* Simple check codes are not sufficient for unverified dedup. Even with
|
|
* a maximally-sized check code unverified dedup should only be used in
|
|
* in subdirectory trees where you do not need 100% data integrity.
|
|
*
|
|
* Unverified dedup is deduping based on meta-data only without verifying
|
|
* that the data blocks are actually identical. Verified dedup guarantees
|
|
* integrity but is a far more I/O-expensive operation.
|
|
*
|
|
* --
|
|
*
|
|
* mirror_tid - per cluster node modified (propagated upward by flush)
|
|
* modify_tid - clc record modified (not propagated).
|
|
* update_tid - clc record updated (propagated upward on verification)
|
|
*
|
|
* CLC - Stands for 'Cluster Level Change', identifiers which are identical
|
|
* within the topology across all cluster nodes (when fully
|
|
* synchronized).
|
|
*
|
|
* NOTE: The range of keys represented by the blockref is (key) to
|
|
* ((key) + (1LL << keybits) - 1). HAMMER2 usually populates
|
|
* blocks bottom-up, inserting a new root when radix expansion
|
|
* is required.
|
|
*
|
|
* leaf_count - Helps manage leaf collapse calculations when indirect
|
|
* blocks become mostly empty. This value caps out at
|
|
* HAMMER2_BLOCKREF_LEAF_MAX (65535).
|
|
*
|
|
* Used by the chain code to determine when to pull leafs up
|
|
* from nearly empty indirect blocks. For the purposes of this
|
|
* calculation, BREF_TYPE_INODE is considered a leaf, along
|
|
* with DIRENT and DATA.
|
|
*
|
|
* RESERVED FIELDS
|
|
*
|
|
* A number of blockref fields are reserved and should generally be set to
|
|
* 0 for future compatibility.
|
|
*
|
|
* FUTURE BLOCKREF EXPANSION
|
|
*
|
|
* CONTENT ADDRESSABLE INDEXING (future) - Using a 256 or 512-bit check code.
|
|
*/
|
|
struct hammer2_blockref { /* MUST BE EXACTLY 64 BYTES */
|
|
uint8_t type; /* type of underlying item */
|
|
uint8_t methods; /* check method & compression method */
|
|
uint8_t copyid; /* specify which copy this is */
|
|
uint8_t keybits; /* #of keybits masked off 0=leaf */
|
|
uint8_t vradix; /* virtual data/meta-data size */
|
|
uint8_t flags; /* blockref flags */
|
|
uint16_t leaf_count; /* leaf aggregation count */
|
|
hammer2_key_t key; /* key specification */
|
|
hammer2_tid_t mirror_tid; /* media flush topology & freemap */
|
|
hammer2_tid_t modify_tid; /* clc modify (not propagated) */
|
|
hammer2_off_t data_off; /* low 6 bits is phys size (radix)*/
|
|
hammer2_tid_t update_tid; /* clc modify (propagated upward) */
|
|
union {
|
|
char buf[16];
|
|
|
|
/*
|
|
* Directory entry header (BREF_TYPE_DIRENT)
|
|
*
|
|
* NOTE: check.buf contains filename if <= 64 bytes. Longer
|
|
* filenames are stored in a data reference of size
|
|
* HAMMER2_ALLOC_MIN (at least 256, typically 1024).
|
|
*
|
|
* NOTE: inode structure may contain a copy of a recently
|
|
* associated filename, for recovery purposes.
|
|
*
|
|
* NOTE: Superroot entries are INODEs, not DIRENTs. Code
|
|
* allows both cases.
|
|
*/
|
|
hammer2_dirent_head_t dirent;
|
|
|
|
/*
|
|
* Statistics aggregation (BREF_TYPE_INODE, BREF_TYPE_INDIRECT)
|
|
*/
|
|
struct {
|
|
hammer2_key_t data_count;
|
|
hammer2_key_t inode_count;
|
|
} stats;
|
|
} embed;
|
|
union { /* check info */
|
|
char buf[64];
|
|
struct {
|
|
uint32_t value;
|
|
uint32_t reserved[15];
|
|
} iscsi32;
|
|
struct {
|
|
uint64_t value;
|
|
uint64_t reserved[7];
|
|
} xxhash64;
|
|
struct {
|
|
char data[24];
|
|
char reserved[40];
|
|
} sha192;
|
|
struct {
|
|
char data[32];
|
|
char reserved[32];
|
|
} sha256;
|
|
struct {
|
|
char data[64];
|
|
} sha512;
|
|
|
|
/*
|
|
* Freemap hints are embedded in addition to the icrc32.
|
|
*
|
|
* bigmask - Radixes available for allocation (0-31).
|
|
* Heuristical (may be permissive but not
|
|
* restrictive). Typically only radix values
|
|
* 10-16 are used (i.e. (1<<10) through (1<<16)).
|
|
*
|
|
* avail - Total available space remaining, in bytes
|
|
*/
|
|
struct {
|
|
uint32_t icrc32;
|
|
uint32_t bigmask; /* available radixes */
|
|
uint64_t avail; /* total available bytes */
|
|
char reserved[48];
|
|
} freemap;
|
|
} check;
|
|
} __packed;
|
|
|
|
typedef struct hammer2_blockref hammer2_blockref_t;
|
|
|
|
#define HAMMER2_BLOCKREF_BYTES 128 /* blockref struct in bytes */
|
|
#define HAMMER2_BLOCKREF_RADIX 7
|
|
|
|
#define HAMMER2_BLOCKREF_LEAF_MAX 65535
|
|
|
|
/*
|
|
* On-media and off-media blockref types.
|
|
*
|
|
* types >= 128 are pseudo values that should never be present on-media.
|
|
*/
|
|
#define HAMMER2_BREF_TYPE_EMPTY 0
|
|
#define HAMMER2_BREF_TYPE_INODE 1
|
|
#define HAMMER2_BREF_TYPE_INDIRECT 2
|
|
#define HAMMER2_BREF_TYPE_DATA 3
|
|
#define HAMMER2_BREF_TYPE_DIRENT 4
|
|
#define HAMMER2_BREF_TYPE_FREEMAP_NODE 5
|
|
#define HAMMER2_BREF_TYPE_FREEMAP_LEAF 6
|
|
#define HAMMER2_BREF_TYPE_FREEMAP 254 /* pseudo-type */
|
|
#define HAMMER2_BREF_TYPE_VOLUME 255 /* pseudo-type */
|
|
|
|
#define HAMMER2_BREF_FLAG_PFSROOT 0x01 /* see also related opflag */
|
|
#define HAMMER2_BREF_FLAG_ZERO 0x02
|
|
|
|
/*
|
|
* Encode/decode check mode and compression mode for
|
|
* bref.methods. The compression level is not encoded in
|
|
* bref.methods.
|
|
*/
|
|
#define HAMMER2_ENC_CHECK(n) (((n) & 15) << 4)
|
|
#define HAMMER2_DEC_CHECK(n) (((n) >> 4) & 15)
|
|
#define HAMMER2_ENC_COMP(n) ((n) & 15)
|
|
#define HAMMER2_DEC_COMP(n) ((n) & 15)
|
|
|
|
#define HAMMER2_CHECK_NONE 0
|
|
#define HAMMER2_CHECK_DISABLED 1
|
|
#define HAMMER2_CHECK_ISCSI32 2
|
|
#define HAMMER2_CHECK_XXHASH64 3
|
|
#define HAMMER2_CHECK_SHA192 4
|
|
#define HAMMER2_CHECK_FREEMAP 5
|
|
|
|
#define HAMMER2_CHECK_DEFAULT HAMMER2_CHECK_XXHASH64
|
|
|
|
/* user-specifiable check modes only */
|
|
#define HAMMER2_CHECK_STRINGS { "none", "disabled", "crc32", \
|
|
"xxhash64", "sha192" }
|
|
#define HAMMER2_CHECK_STRINGS_COUNT 5
|
|
|
|
/*
|
|
* Encode/decode check or compression algorithm request in
|
|
* ipdata->meta.check_algo and ipdata->meta.comp_algo.
|
|
*/
|
|
#define HAMMER2_ENC_ALGO(n) (n)
|
|
#define HAMMER2_DEC_ALGO(n) ((n) & 15)
|
|
#define HAMMER2_ENC_LEVEL(n) ((n) << 4)
|
|
#define HAMMER2_DEC_LEVEL(n) (((n) >> 4) & 15)
|
|
|
|
#define HAMMER2_COMP_NONE 0
|
|
#define HAMMER2_COMP_AUTOZERO 1
|
|
#define HAMMER2_COMP_LZ4 2
|
|
#define HAMMER2_COMP_ZLIB 3
|
|
|
|
#define HAMMER2_COMP_NEWFS_DEFAULT HAMMER2_COMP_LZ4
|
|
#define HAMMER2_COMP_STRINGS { "none", "autozero", "lz4", "zlib" }
|
|
#define HAMMER2_COMP_STRINGS_COUNT 4
|
|
|
|
/*
|
|
* Passed to hammer2_chain_create(), causes methods to be inherited from
|
|
* parent.
|
|
*/
|
|
#define HAMMER2_METH_DEFAULT -1
|
|
|
|
/*
|
|
* HAMMER2 block references are collected into sets of 4 blockrefs. These
|
|
* sets are fully associative, meaning the elements making up a set are
|
|
* not sorted in any way and may contain duplicate entries, holes, or
|
|
* entries which shortcut multiple levels of indirection. Sets are used
|
|
* in various ways:
|
|
*
|
|
* (1) When redundancy is desired a set may contain several duplicate
|
|
* entries pointing to different copies of the same data. Up to 4 copies
|
|
* are supported.
|
|
*
|
|
* (2) The blockrefs in a set can shortcut multiple levels of indirections
|
|
* within the bounds imposed by the parent of set.
|
|
*
|
|
* When a set fills up another level of indirection is inserted, moving
|
|
* some or all of the set's contents into indirect blocks placed under the
|
|
* set. This is a top-down approach in that indirect blocks are not created
|
|
* until the set actually becomes full (that is, the entries in the set can
|
|
* shortcut the indirect blocks when the set is not full). Depending on how
|
|
* things are filled multiple indirect blocks will eventually be created.
|
|
*
|
|
* Indirect blocks are typically 4KB (64 entres) or 64KB (1024 entries) and
|
|
* are also treated as fully set-associative.
|
|
*/
|
|
struct hammer2_blockset {
|
|
hammer2_blockref_t blockref[HAMMER2_SET_COUNT];
|
|
};
|
|
|
|
typedef struct hammer2_blockset hammer2_blockset_t;
|
|
|
|
/*
|
|
* Catch programmer snafus
|
|
*/
|
|
#if (1 << HAMMER2_SET_RADIX) != HAMMER2_SET_COUNT
|
|
#error "hammer2 direct radix is incorrect"
|
|
#endif
|
|
#if (1 << HAMMER2_PBUFRADIX) != HAMMER2_PBUFSIZE
|
|
#error "HAMMER2_PBUFRADIX and HAMMER2_PBUFSIZE are inconsistent"
|
|
#endif
|
|
#if (1 << HAMMER2_RADIX_MIN) != HAMMER2_ALLOC_MIN
|
|
#error "HAMMER2_RADIX_MIN and HAMMER2_ALLOC_MIN are inconsistent"
|
|
#endif
|
|
|
|
/*
|
|
* hammer2_bmap_data - A freemap entry in the LEVEL1 block.
|
|
*
|
|
* Each 128-byte entry contains the bitmap and meta-data required to manage
|
|
* a LEVEL0 (4MB) block of storage. The storage is managed in 256 x 16KB
|
|
* chunks.
|
|
*
|
|
* A smaller allocation granularity is supported via a linear iterator and/or
|
|
* must otherwise be tracked in ram.
|
|
*
|
|
* (data structure must be 128 bytes exactly)
|
|
*
|
|
* linear - A BYTE linear allocation offset used for sub-16KB allocations
|
|
* only. May contain values between 0 and 4MB. Must be ignored
|
|
* if 16KB-aligned (i.e. force bitmap scan), otherwise may be
|
|
* used to sub-allocate within the 16KB block (which is already
|
|
* marked as allocated in the bitmap).
|
|
*
|
|
* Sub-allocations need only be 1KB-aligned and do not have to be
|
|
* size-aligned, and 16KB or larger allocations do not update this
|
|
* field, resulting in pretty good packing.
|
|
*
|
|
* Please note that file data granularity may be limited by
|
|
* other issues such as buffer cache direct-mapping and the
|
|
* desire to support sector sizes up to 16KB (so H2 only issues
|
|
* I/O's in multiples of 16KB anyway).
|
|
*
|
|
* class - Clustering class. Cleared to 0 only if the entire leaf becomes
|
|
* free. Used to cluster device buffers so all elements must have
|
|
* the same device block size, but may mix logical sizes.
|
|
*
|
|
* Typically integrated with the blockref type in the upper 8 bits
|
|
* to localize inodes and indrect blocks, improving bulk free scans
|
|
* and directory scans.
|
|
*
|
|
* bitmap - Two bits per 16KB allocation block arranged in arrays of
|
|
* 64-bit elements, 256x2 bits representing ~4MB worth of media
|
|
* storage. Bit patterns are as follows:
|
|
*
|
|
* 00 Unallocated
|
|
* 01 (reserved)
|
|
* 10 Possibly free
|
|
* 11 Allocated
|
|
*/
|
|
struct hammer2_bmap_data {
|
|
int32_t linear; /* 00 linear sub-granular allocation offset */
|
|
uint16_t class; /* 04-05 clustering class ((type<<8)|radix) */
|
|
uint8_t reserved06; /* 06 */
|
|
uint8_t reserved07; /* 07 */
|
|
uint32_t reserved08; /* 08 */
|
|
uint32_t reserved0C; /* 0C */
|
|
uint32_t reserved10; /* 10 */
|
|
uint32_t reserved14; /* 14 */
|
|
uint32_t reserved18; /* 18 */
|
|
uint32_t avail; /* 1C */
|
|
uint32_t reserved20[8]; /* 20-3F 256 bits manages 128K/1KB/2-bits */
|
|
/* 40-7F 512 bits manages 4MB of storage */
|
|
hammer2_bitmap_t bitmapq[HAMMER2_BMAP_ELEMENTS];
|
|
} __packed;
|
|
|
|
typedef struct hammer2_bmap_data hammer2_bmap_data_t;
|
|
|
|
/*
|
|
* XXX "Inodes ARE directory entries" is no longer the case. Hardlinks are
|
|
* dirents which refer to the same inode#, which is how filesystems usually
|
|
* implement hardlink. The following comments need to be updated.
|
|
*
|
|
* In HAMMER2 inodes ARE directory entries, with a special exception for
|
|
* hardlinks. The inode number is stored in the inode rather than being
|
|
* based on the location of the inode (since the location moves every time
|
|
* the inode or anything underneath the inode is modified).
|
|
*
|
|
* The inode is 1024 bytes, made up of 256 bytes of meta-data, 256 bytes
|
|
* for the filename, and 512 bytes worth of direct file data OR an embedded
|
|
* blockset. The in-memory hammer2_inode structure contains only the mostly-
|
|
* node-independent meta-data portion (some flags are node-specific and will
|
|
* not be synchronized). The rest of the inode is node-specific and chain I/O
|
|
* is required to obtain it.
|
|
*
|
|
* Directories represent one inode per blockref. Inodes are not laid out
|
|
* as a file but instead are represented by the related blockrefs. The
|
|
* blockrefs, in turn, are indexed by the 64-bit directory hash key. Remember
|
|
* that blocksets are fully associative, so a certain degree efficiency is
|
|
* achieved just from that.
|
|
*
|
|
* Up to 512 bytes of direct data can be embedded in an inode, and since
|
|
* inodes are essentially directory entries this also means that small data
|
|
* files end up simply being laid out linearly in the directory, resulting
|
|
* in fewer seeks and highly optimal access.
|
|
*
|
|
* The compression mode can be changed at any time in the inode and is
|
|
* recorded on a blockref-by-blockref basis.
|
|
*
|
|
* Hardlinks are supported via the inode map. Essentially the way a hardlink
|
|
* works is that all individual directory entries representing the same file
|
|
* are special cased and specify the same inode number. The actual file
|
|
* is placed in the nearest parent directory that is parent to all instances
|
|
* of the hardlink. If all hardlinks to a file are in the same directory
|
|
* the actual file will also be placed in that directory. This file uses
|
|
* the inode number as the directory entry key and is invisible to normal
|
|
* directory scans. Real directory entry keys are differentiated from the
|
|
* inode number key via bit 63. Access to the hardlink silently looks up
|
|
* the real file and forwards all operations to that file. Removal of the
|
|
* last hardlink also removes the real file.
|
|
*/
|
|
#define HAMMER2_INODE_BYTES 1024 /* (asserted by code) */
|
|
#define HAMMER2_INODE_MAXNAME 256 /* maximum name in bytes */
|
|
#define HAMMER2_INODE_VERSION_ONE 1
|
|
|
|
#define HAMMER2_INODE_START 1024 /* dynamically allocated */
|
|
|
|
struct hammer2_inode_meta {
|
|
uint16_t version; /* 0000 inode data version */
|
|
uint8_t reserved02; /* 0002 */
|
|
uint8_t pfs_subtype; /* 0003 pfs sub-type */
|
|
|
|
/*
|
|
* core inode attributes, inode type, misc flags
|
|
*/
|
|
uint32_t uflags; /* 0004 chflags */
|
|
uint32_t rmajor; /* 0008 available for device nodes */
|
|
uint32_t rminor; /* 000C available for device nodes */
|
|
uint64_t ctime; /* 0010 inode change time */
|
|
uint64_t mtime; /* 0018 modified time */
|
|
uint64_t atime; /* 0020 access time (unsupported) */
|
|
uint64_t btime; /* 0028 birth time */
|
|
uuid_t uid; /* 0030 uid / degenerate unix uid */
|
|
uuid_t gid; /* 0040 gid / degenerate unix gid */
|
|
|
|
uint8_t type; /* 0050 object type */
|
|
uint8_t op_flags; /* 0051 operational flags */
|
|
uint16_t cap_flags; /* 0052 capability flags */
|
|
uint32_t mode; /* 0054 unix modes (typ low 16 bits) */
|
|
|
|
/*
|
|
* inode size, identification, localized recursive configuration
|
|
* for compression and backup copies.
|
|
*
|
|
* NOTE: Nominal parent inode number (iparent) is only applicable
|
|
* for directories but can also help for files during
|
|
* catastrophic recovery.
|
|
*/
|
|
hammer2_tid_t inum; /* 0058 inode number */
|
|
hammer2_off_t size; /* 0060 size of file */
|
|
uint64_t nlinks; /* 0068 hard links (typ only dirs) */
|
|
hammer2_tid_t iparent; /* 0070 nominal parent inum */
|
|
hammer2_key_t name_key; /* 0078 full filename key */
|
|
uint16_t name_len; /* 0080 filename length */
|
|
uint8_t ncopies; /* 0082 ncopies to local media */
|
|
uint8_t comp_algo; /* 0083 compression request & algo */
|
|
|
|
/*
|
|
* These fields are currently only applicable to PFSROOTs.
|
|
*
|
|
* NOTE: We can't use {volume_data->fsid, pfs_clid} to uniquely
|
|
* identify an instance of a PFS in the cluster because
|
|
* a mount may contain more than one copy of the PFS as
|
|
* a separate node. {pfs_clid, pfs_fsid} must be used for
|
|
* registration in the cluster.
|
|
*/
|
|
uint8_t target_type; /* 0084 hardlink target type */
|
|
uint8_t check_algo; /* 0085 check code request & algo */
|
|
uint8_t pfs_nmasters; /* 0086 (if PFSROOT) if multi-master */
|
|
uint8_t pfs_type; /* 0087 (if PFSROOT) node type */
|
|
uint64_t pfs_inum; /* 0088 (if PFSROOT) inum allocator */
|
|
uuid_t pfs_clid; /* 0090 (if PFSROOT) cluster uuid */
|
|
uuid_t pfs_fsid; /* 00A0 (if PFSROOT) unique uuid */
|
|
|
|
/*
|
|
* Quotas and aggregate sub-tree inode and data counters. Note that
|
|
* quotas are not replicated downward, they are explicitly set by
|
|
* the sysop and in-memory structures keep track of inheritance.
|
|
*/
|
|
hammer2_key_t data_quota; /* 00B0 subtree quota in bytes */
|
|
hammer2_key_t unusedB8; /* 00B8 subtree byte count */
|
|
hammer2_key_t inode_quota; /* 00C0 subtree quota inode count */
|
|
hammer2_key_t unusedC8; /* 00C8 subtree inode count */
|
|
|
|
/*
|
|
* The last snapshot tid is tested against modify_tid to determine
|
|
* when a copy must be made of a data block whos check mode has been
|
|
* disabled (a disabled check mode allows data blocks to be updated
|
|
* in place instead of copy-on-write).
|
|
*/
|
|
hammer2_tid_t pfs_lsnap_tid; /* 00D0 last snapshot tid */
|
|
hammer2_tid_t reservedD8; /* 00D8 (avail) */
|
|
|
|
/*
|
|
* Tracks (possibly degenerate) free areas covering all sub-tree
|
|
* allocations under inode, not counting the inode itself.
|
|
* 0/0 indicates empty entry. fully set-associative.
|
|
*
|
|
* (not yet implemented)
|
|
*/
|
|
uint64_t decrypt_check; /* 00E0 decryption validator */
|
|
hammer2_off_t reservedE0[3]; /* 00E8/F0/F8 */
|
|
} __packed;
|
|
|
|
typedef struct hammer2_inode_meta hammer2_inode_meta_t;
|
|
|
|
struct hammer2_inode_data {
|
|
hammer2_inode_meta_t meta; /* 0000-00FF */
|
|
unsigned char filename[HAMMER2_INODE_MAXNAME];
|
|
/* 0100-01FF (256 char, unterminated) */
|
|
union { /* 0200-03FF (64x8 = 512 bytes) */
|
|
hammer2_blockset_t blockset;
|
|
char data[HAMMER2_EMBEDDED_BYTES];
|
|
} u;
|
|
} __packed;
|
|
|
|
typedef struct hammer2_inode_data hammer2_inode_data_t;
|
|
|
|
#define HAMMER2_OPFLAG_DIRECTDATA 0x01
|
|
#define HAMMER2_OPFLAG_PFSROOT 0x02 /* (see also bref flag) */
|
|
#define HAMMER2_OPFLAG_COPYIDS 0x04 /* copyids override parent */
|
|
|
|
#define HAMMER2_OBJTYPE_UNKNOWN 0
|
|
#define HAMMER2_OBJTYPE_DIRECTORY 1
|
|
#define HAMMER2_OBJTYPE_REGFILE 2
|
|
#define HAMMER2_OBJTYPE_FIFO 4
|
|
#define HAMMER2_OBJTYPE_CDEV 5
|
|
#define HAMMER2_OBJTYPE_BDEV 6
|
|
#define HAMMER2_OBJTYPE_SOFTLINK 7
|
|
#define HAMMER2_OBJTYPE_UNUSED08 8
|
|
#define HAMMER2_OBJTYPE_SOCKET 9
|
|
#define HAMMER2_OBJTYPE_WHITEOUT 10
|
|
|
|
#define HAMMER2_COPYID_NONE 0
|
|
#define HAMMER2_COPYID_LOCAL ((uint8_t)-1)
|
|
|
|
#define HAMMER2_COPYID_COUNT 256
|
|
|
|
/*
|
|
* PFS types identify the role of a PFS within a cluster. The PFS types
|
|
* is stored on media and in LNK_SPAN messages and used in other places.
|
|
*
|
|
* The low 4 bits specify the current active type while the high 4 bits
|
|
* specify the transition target if the PFS is being upgraded or downgraded,
|
|
* If the upper 4 bits are not zero it may effect how a PFS is used during
|
|
* the transition.
|
|
*
|
|
* Generally speaking, downgrading a MASTER to a SLAVE cannot complete until
|
|
* at least all MASTERs have updated their pfs_nmasters field. And upgrading
|
|
* a SLAVE to a MASTER cannot complete until the new prospective master has
|
|
* been fully synchronized (though theoretically full synchronization is
|
|
* not required if a (new) quorum of other masters are fully synchronized).
|
|
*
|
|
* It generally does not matter which PFS element you actually mount, you
|
|
* are mounting 'the cluster'. So, for example, a network mount will mount
|
|
* a DUMMY PFS type on a memory filesystem. However, there are two exceptions.
|
|
* In order to gain the benefits of a SOFT_MASTER or SOFT_SLAVE, those PFSs
|
|
* must be directly mounted.
|
|
*/
|
|
#define HAMMER2_PFSTYPE_NONE 0x00
|
|
#define HAMMER2_PFSTYPE_CACHE 0x01
|
|
#define HAMMER2_PFSTYPE_UNUSED02 0x02
|
|
#define HAMMER2_PFSTYPE_SLAVE 0x03
|
|
#define HAMMER2_PFSTYPE_SOFT_SLAVE 0x04
|
|
#define HAMMER2_PFSTYPE_SOFT_MASTER 0x05
|
|
#define HAMMER2_PFSTYPE_MASTER 0x06
|
|
#define HAMMER2_PFSTYPE_UNUSED07 0x07
|
|
#define HAMMER2_PFSTYPE_SUPROOT 0x08
|
|
#define HAMMER2_PFSTYPE_DUMMY 0x09
|
|
#define HAMMER2_PFSTYPE_MAX 16
|
|
|
|
#define HAMMER2_PFSTRAN_NONE 0x00 /* no transition in progress */
|
|
#define HAMMER2_PFSTRAN_CACHE 0x10
|
|
#define HAMMER2_PFSTRAN_UNMUSED20 0x20
|
|
#define HAMMER2_PFSTRAN_SLAVE 0x30
|
|
#define HAMMER2_PFSTRAN_SOFT_SLAVE 0x40
|
|
#define HAMMER2_PFSTRAN_SOFT_MASTER 0x50
|
|
#define HAMMER2_PFSTRAN_MASTER 0x60
|
|
#define HAMMER2_PFSTRAN_UNUSED70 0x70
|
|
#define HAMMER2_PFSTRAN_SUPROOT 0x80
|
|
#define HAMMER2_PFSTRAN_DUMMY 0x90
|
|
|
|
#define HAMMER2_PFS_DEC(n) ((n) & 0x0F)
|
|
#define HAMMER2_PFS_DEC_TRANSITION(n) (((n) >> 4) & 0x0F)
|
|
#define HAMMER2_PFS_ENC_TRANSITION(n) (((n) & 0x0F) << 4)
|
|
|
|
#define HAMMER2_PFSSUBTYPE_NONE 0
|
|
#define HAMMER2_PFSSUBTYPE_SNAPSHOT 1 /* manual/managed snapshot */
|
|
#define HAMMER2_PFSSUBTYPE_AUTOSNAP 2 /* automatic snapshot */
|
|
|
|
/*
|
|
* PFS mode of operation is a bitmask. This is typically not stored
|
|
* on-media, but defined here because the field may be used in dmsgs.
|
|
*/
|
|
#define HAMMER2_PFSMODE_QUORUM 0x01
|
|
#define HAMMER2_PFSMODE_RW 0x02
|
|
|
|
/*
|
|
* Allocation Table
|
|
*
|
|
*/
|
|
|
|
|
|
/*
|
|
* Flags (8 bits) - blockref, for freemap only
|
|
*
|
|
* Note that the minimum chunk size is 1KB so we could theoretically have
|
|
* 10 bits here, but we might have some future extension that allows a
|
|
* chunk size down to 256 bytes and if so we will need bits 8 and 9.
|
|
*/
|
|
#define HAMMER2_AVF_SELMASK 0x03 /* select group */
|
|
#define HAMMER2_AVF_ALL_ALLOC 0x04 /* indicate all allocated */
|
|
#define HAMMER2_AVF_ALL_FREE 0x08 /* indicate all free */
|
|
#define HAMMER2_AVF_RESERVED10 0x10
|
|
#define HAMMER2_AVF_RESERVED20 0x20
|
|
#define HAMMER2_AVF_RESERVED40 0x40
|
|
#define HAMMER2_AVF_RESERVED80 0x80
|
|
#define HAMMER2_AVF_AVMASK32 ((uint32_t)0xFFFFFF00LU)
|
|
#define HAMMER2_AVF_AVMASK64 ((uint64_t)0xFFFFFFFFFFFFFF00LLU)
|
|
|
|
#define HAMMER2_AV_SELECT_A 0x00
|
|
#define HAMMER2_AV_SELECT_B 0x01
|
|
#define HAMMER2_AV_SELECT_C 0x02
|
|
#define HAMMER2_AV_SELECT_D 0x03
|
|
|
|
/*
|
|
* The volume header eats a 64K block. There is currently an issue where
|
|
* we want to try to fit all nominal filesystem updates in a 512-byte section
|
|
* but it may be a lost cause due to the need for a blockset.
|
|
*
|
|
* All information is stored in host byte order. The volume header's magic
|
|
* number may be checked to determine the byte order. If you wish to mount
|
|
* between machines w/ different endian modes you'll need filesystem code
|
|
* which acts on the media data consistently (either all one way or all the
|
|
* other). Our code currently does not do that.
|
|
*
|
|
* A read-write mount may have to recover missing allocations by doing an
|
|
* incremental mirror scan looking for modifications made after alloc_tid.
|
|
* If alloc_tid == last_tid then no recovery operation is needed. Recovery
|
|
* operations are usually very, very fast.
|
|
*
|
|
* Read-only mounts do not need to do any recovery, access to the filesystem
|
|
* topology is always consistent after a crash (is always consistent, period).
|
|
* However, there may be shortcutted blockref updates present from deep in
|
|
* the tree which are stored in the volumeh eader and must be tracked on
|
|
* the fly.
|
|
*
|
|
* NOTE: The copyinfo[] array contains the configuration for both the
|
|
* cluster connections and any local media copies. The volume
|
|
* header will be replicated for each local media copy.
|
|
*
|
|
* The mount command may specify multiple medias or just one and
|
|
* allow HAMMER2 to pick up the others when it checks the copyinfo[]
|
|
* array on mount.
|
|
*
|
|
* NOTE: root_blockref points to the super-root directory, not the root
|
|
* directory. The root directory will be a subdirectory under the
|
|
* super-root.
|
|
*
|
|
* The super-root directory contains all root directories and all
|
|
* snapshots (readonly or writable). It is possible to do a
|
|
* null-mount of the super-root using special path constructions
|
|
* relative to your mounted root.
|
|
*
|
|
* NOTE: HAMMER2 allows any subdirectory tree to be managed as if it were
|
|
* a PFS, including mirroring and storage quota operations, and this is
|
|
* preferred over creating discrete PFSs in the super-root. Instead
|
|
* the super-root is most typically used to create writable snapshots,
|
|
* alternative roots, and so forth. The super-root is also used by
|
|
* the automatic snapshotting mechanism.
|
|
*/
|
|
#define HAMMER2_VOLUME_ID_HBO 0x48414d3205172011LLU
|
|
#define HAMMER2_VOLUME_ID_ABO 0x11201705324d4148LLU
|
|
|
|
struct hammer2_volume_data {
|
|
/*
|
|
* sector #0 - 512 bytes
|
|
*/
|
|
uint64_t magic; /* 0000 Signature */
|
|
hammer2_off_t boot_beg; /* 0008 Boot area (future) */
|
|
hammer2_off_t boot_end; /* 0010 (size = end - beg) */
|
|
hammer2_off_t aux_beg; /* 0018 Aux area (future) */
|
|
hammer2_off_t aux_end; /* 0020 (size = end - beg) */
|
|
hammer2_off_t volu_size; /* 0028 Volume size, bytes */
|
|
|
|
uint32_t version; /* 0030 */
|
|
uint32_t flags; /* 0034 */
|
|
uint8_t copyid; /* 0038 copyid of phys vol */
|
|
uint8_t freemap_version; /* 0039 freemap algorithm */
|
|
uint8_t peer_type; /* 003A HAMMER2_PEER_xxx */
|
|
uint8_t reserved003B; /* 003B */
|
|
uint32_t reserved003C; /* 003C */
|
|
|
|
uuid_t fsid; /* 0040 */
|
|
uuid_t fstype; /* 0050 */
|
|
|
|
/*
|
|
* allocator_size is precalculated at newfs time and does not include
|
|
* reserved blocks, boot, or redo areas.
|
|
*
|
|
* Initial non-reserved-area allocations do not use the freemap
|
|
* but instead adjust alloc_iterator. Dynamic allocations take
|
|
* over starting at (allocator_beg). This makes newfs_hammer2's
|
|
* job a lot easier and can also serve as a testing jig.
|
|
*/
|
|
hammer2_off_t allocator_size; /* 0060 Total data space */
|
|
hammer2_off_t allocator_free; /* 0068 Free space */
|
|
hammer2_off_t allocator_beg; /* 0070 Initial allocations */
|
|
|
|
/*
|
|
* mirror_tid reflects the highest committed change for this
|
|
* block device regardless of whether it is to the super-root
|
|
* or to a PFS or whatever.
|
|
*
|
|
* freemap_tid reflects the highest committed freemap change for
|
|
* this block device.
|
|
*/
|
|
hammer2_tid_t mirror_tid; /* 0078 committed tid (vol) */
|
|
hammer2_tid_t reserved0080; /* 0080 */
|
|
hammer2_tid_t reserved0088; /* 0088 */
|
|
hammer2_tid_t freemap_tid; /* 0090 committed tid (fmap) */
|
|
hammer2_tid_t bulkfree_tid; /* 0098 bulkfree incremental */
|
|
hammer2_tid_t reserved00A0[5]; /* 00A0-00C7 */
|
|
|
|
/*
|
|
* Copyids are allocated dynamically from the copyexists bitmap.
|
|
* An id from the active copies set (up to 8, see copyinfo later on)
|
|
* may still exist after the copy set has been removed from the
|
|
* volume header and its bit will remain active in the bitmap and
|
|
* cannot be reused until it is 100% removed from the hierarchy.
|
|
*/
|
|
uint32_t copyexists[8]; /* 00C8-00E7 copy exists bmap */
|
|
char reserved0140[248]; /* 00E8-01DF */
|
|
|
|
/*
|
|
* 32 bit CRC array at the end of the first 512 byte sector.
|
|
*
|
|
* icrc_sects[7] - First 512-4 bytes of volume header (including all
|
|
* the other icrc's except this one).
|
|
*
|
|
* icrc_sects[6] - Sector 1 (512 bytes) of volume header, which is
|
|
* the blockset for the root.
|
|
*
|
|
* icrc_sects[5] - Sector 2
|
|
* icrc_sects[4] - Sector 3
|
|
* icrc_sects[3] - Sector 4 (the freemap blockset)
|
|
*/
|
|
hammer2_crc32_t icrc_sects[8]; /* 01E0-01FF */
|
|
|
|
/*
|
|
* sector #1 - 512 bytes
|
|
*
|
|
* The entire sector is used by a blockset.
|
|
*/
|
|
hammer2_blockset_t sroot_blockset; /* 0200-03FF Superroot dir */
|
|
|
|
/*
|
|
* sector #2-7
|
|
*/
|
|
char sector2[512]; /* 0400-05FF reserved */
|
|
char sector3[512]; /* 0600-07FF reserved */
|
|
hammer2_blockset_t freemap_blockset; /* 0800-09FF freemap */
|
|
char sector5[512]; /* 0A00-0BFF reserved */
|
|
char sector6[512]; /* 0C00-0DFF reserved */
|
|
char sector7[512]; /* 0E00-0FFF reserved */
|
|
|
|
/*
|
|
* sector #8-71 - 32768 bytes
|
|
*
|
|
* Contains the configuration for up to 256 copyinfo targets. These
|
|
* specify local and remote copies operating as masters or slaves.
|
|
* copyid's 0 and 255 are reserved (0 indicates an empty slot and 255
|
|
* indicates the local media).
|
|
*
|
|
* Each inode contains a set of up to 8 copyids, either inherited
|
|
* from its parent or explicitly specified in the inode, which
|
|
* indexes into this array.
|
|
*/
|
|
/* 1000-8FFF copyinfo config */
|
|
hammer2_volconf_t copyinfo[HAMMER2_COPYID_COUNT];
|
|
|
|
/*
|
|
* Remaining sections are reserved for future use.
|
|
*/
|
|
char reserved0400[0x6FFC]; /* 9000-FFFB reserved */
|
|
|
|
/*
|
|
* icrc on entire volume header
|
|
*/
|
|
hammer2_crc32_t icrc_volheader; /* FFFC-FFFF full volume icrc*/
|
|
} __packed;
|
|
|
|
typedef struct hammer2_volume_data hammer2_volume_data_t;
|
|
|
|
/*
|
|
* Various parts of the volume header have their own iCRCs.
|
|
*
|
|
* The first 512 bytes has its own iCRC stored at the end of the 512 bytes
|
|
* and not included the icrc calculation.
|
|
*
|
|
* The second 512 bytes also has its own iCRC but it is stored in the first
|
|
* 512 bytes so it covers the entire second 512 bytes.
|
|
*
|
|
* The whole volume block (64KB) has an iCRC covering all but the last 4 bytes,
|
|
* which is where the iCRC for the whole volume is stored. This is currently
|
|
* a catch-all for anything not individually iCRCd.
|
|
*/
|
|
#define HAMMER2_VOL_ICRC_SECT0 7
|
|
#define HAMMER2_VOL_ICRC_SECT1 6
|
|
|
|
#define HAMMER2_VOLUME_BYTES 65536
|
|
|
|
#define HAMMER2_VOLUME_ICRC0_OFF 0
|
|
#define HAMMER2_VOLUME_ICRC1_OFF 512
|
|
#define HAMMER2_VOLUME_ICRCVH_OFF 0
|
|
|
|
#define HAMMER2_VOLUME_ICRC0_SIZE (512 - 4)
|
|
#define HAMMER2_VOLUME_ICRC1_SIZE (512)
|
|
#define HAMMER2_VOLUME_ICRCVH_SIZE (65536 - 4)
|
|
|
|
#define HAMMER2_VOL_VERSION_MIN 1
|
|
#define HAMMER2_VOL_VERSION_DEFAULT 1
|
|
#define HAMMER2_VOL_VERSION_WIP 2
|
|
|
|
#define HAMMER2_NUM_VOLHDRS 4
|
|
|
|
union hammer2_media_data {
|
|
hammer2_volume_data_t voldata;
|
|
hammer2_inode_data_t ipdata;
|
|
hammer2_blockset_t blkset;
|
|
hammer2_blockref_t npdata[HAMMER2_IND_COUNT_MAX];
|
|
hammer2_bmap_data_t bmdata[HAMMER2_FREEMAP_COUNT];
|
|
char buf[HAMMER2_PBUFSIZE];
|
|
} __packed;
|
|
|
|
typedef union hammer2_media_data hammer2_media_data_t;
|
|
|
|
#endif /* !_HAMMER2_DISK_H_ */
|