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/*-
* Copyright (c) 2011-2014 The DragonFly Project. All rights reserved.
*
* This code is derived from software contributed to The DragonFly Project
* by Matthew Dillon <dillon@dragonflybsd.org>
* by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name of The DragonFly Project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific, prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _VFS_HAMMER2_DISK_H_
#define _VFS_HAMMER2_DISK_H_
#ifndef _SYS_DMSG_H_
#include <sys/uuid.h>
/*
* dmsg_hdr must be 64 bytes
*/
struct dmsg_hdr {
uint16_t magic; /* 00 sanity, synchro, endian */
uint16_t reserved02; /* 02 */
uint32_t salt; /* 04 random salt helps w/crypto */
uint64_t msgid; /* 08 message transaction id */
uint64_t circuit; /* 10 circuit id or 0 */
uint64_t reserved18; /* 18 */
uint32_t cmd; /* 20 flags | cmd | hdr_size / ALIGN */
uint32_t aux_crc; /* 24 auxillary data crc */
uint32_t aux_bytes; /* 28 auxillary data length (bytes) */
uint32_t error; /* 2C error code or 0 */
uint64_t aux_descr; /* 30 negotiated OOB data descr */
uint32_t reserved38; /* 38 */
uint32_t hdr_crc; /* 3C (aligned) extended header crc */
};
typedef struct dmsg_hdr dmsg_hdr_t;
#endif
/*
* The structures below represent the on-disk media structures for the HAMMER2
* filesystem. Note that all fields for on-disk structures are naturally
* aligned. The host endian format is typically used - compatibility is
* possible if the implementation detects reversed endian and adjusts accesses
* accordingly.
*
* HAMMER2 primarily revolves around the directory topology: inodes,
* directory entries, and block tables. Block device buffer cache buffers
* are always 64KB. Logical file buffers are typically 16KB. All data
* references utilize 64-bit byte offsets.
*
* Free block management is handled independently using blocks reserved by
* the media topology.
*/
/*
* The data at the end of a file or directory may be a fragment in order
* to optimize storage efficiency. The minimum fragment size is 1KB.
* Since allocations are in powers of 2 fragments must also be sized in
* powers of 2 (1024, 2048, ... 65536).
*
* For the moment the maximum allocation size is HAMMER2_PBUFSIZE (64K),
* which is 2^16. Larger extents may be supported in the future. Smaller
* fragments might be supported in the future (down to 64 bytes is possible),
* but probably will not be.
*
* A full indirect block use supports 512 x 128-byte blockrefs in a 64KB
* buffer. Indirect blocks down to 1KB are supported to keep small
* directories small.
*
* A maximally sized file (2^64-1 bytes) requires ~6 indirect block levels
* using 64KB indirect blocks (128 byte refs, 512 or radix 9 per indblk).
*
* 16(datablk) + 9 + 9 + 9 + 9 + 9 + 9 = ~70.
* 16(datablk) + 7 + 9 + 9 + 9 + 9 + 9 = ~68. (smaller top level indblk)
*
* The actual depth depends on copies redundancy and whether the filesystem
* has chosen to use a smaller indirect block size at the top level or not.
*/
#define HAMMER2_ALLOC_MIN 1024 /* minimum allocation size */
#define HAMMER2_RADIX_MIN 10 /* minimum allocation size 2^N */
#define HAMMER2_ALLOC_MAX 65536 /* maximum allocation size */
#define HAMMER2_RADIX_MAX 16 /* maximum allocation size 2^N */
#define HAMMER2_RADIX_KEY 64 /* number of bits in key */
/*
* MINALLOCSIZE - The minimum allocation size. This can be smaller
* or larger than the minimum physical IO size.
*
* NOTE: Should not be larger than 1K since inodes
* are 1K.
*
* MINIOSIZE - The minimum IO size. This must be less than
* or equal to HAMMER2_LBUFSIZE.
*
* HAMMER2_LBUFSIZE - Nominal buffer size for I/O rollups.
*
* HAMMER2_PBUFSIZE - Topological block size used by files for all
* blocks except the block straddling EOF.
*
* HAMMER2_SEGSIZE - Allocation map segment size, typically 2MB
* (space represented by a level0 bitmap).
*/
#define HAMMER2_SEGSIZE (1 << HAMMER2_FREEMAP_LEVEL0_RADIX)
#define HAMMER2_SEGRADIX HAMMER2_FREEMAP_LEVEL0_RADIX
#define HAMMER2_PBUFRADIX 16 /* physical buf (1<<16) bytes */
#define HAMMER2_PBUFSIZE 65536
#define HAMMER2_LBUFRADIX 14 /* logical buf (1<<14) bytes */
#define HAMMER2_LBUFSIZE 16384
/*
* Generally speaking we want to use 16K and 64K I/Os
*/
#define HAMMER2_MINIORADIX HAMMER2_LBUFRADIX
#define HAMMER2_MINIOSIZE HAMMER2_LBUFSIZE
#define HAMMER2_IND_BYTES_MIN 4096
#define HAMMER2_IND_BYTES_NOM HAMMER2_LBUFSIZE
#define HAMMER2_IND_BYTES_MAX HAMMER2_PBUFSIZE
#define HAMMER2_IND_RADIX_MIN 12
#define HAMMER2_IND_RADIX_NOM HAMMER2_LBUFRADIX
#define HAMMER2_IND_RADIX_MAX HAMMER2_PBUFRADIX
#define HAMMER2_IND_COUNT_MIN (HAMMER2_IND_BYTES_MIN / \
sizeof(hammer2_blockref_t))
#define HAMMER2_IND_COUNT_MAX (HAMMER2_IND_BYTES_MAX / \
sizeof(hammer2_blockref_t))
/*
* In HAMMER2, arrays of blockrefs are fully set-associative, meaning that
* any element can occur at any index and holes can be anywhere. As a
* future optimization we will be able to flag that such arrays are sorted
* and thus optimize lookups, but for now we don't.
*
* Inodes embed either 512 bytes of direct data or an array of 8 blockrefs,
* resulting in highly efficient storage for files <= 512 bytes and for files
* <= 512KB. Up to 8 directory entries can be referenced from a directory
* without requiring an indirect block.
*
* Indirect blocks are typically either 4KB (64 blockrefs / ~4MB represented),
* or 64KB (1024 blockrefs / ~64MB represented).
*/
#define HAMMER2_SET_RADIX 2 /* radix 2 = 4 entries */
#define HAMMER2_SET_COUNT (1 << HAMMER2_SET_RADIX)
#define HAMMER2_EMBEDDED_BYTES 512 /* inode blockset/dd size */
#define HAMMER2_EMBEDDED_RADIX 9
#define HAMMER2_PBUFMASK (HAMMER2_PBUFSIZE - 1)
#define HAMMER2_LBUFMASK (HAMMER2_LBUFSIZE - 1)
#define HAMMER2_SEGMASK (HAMMER2_SEGSIZE - 1)
#define HAMMER2_LBUFMASK64 ((hammer2_off_t)HAMMER2_LBUFMASK)
#define HAMMER2_PBUFSIZE64 ((hammer2_off_t)HAMMER2_PBUFSIZE)
#define HAMMER2_PBUFMASK64 ((hammer2_off_t)HAMMER2_PBUFMASK)
#define HAMMER2_SEGSIZE64 ((hammer2_off_t)HAMMER2_SEGSIZE)
#define HAMMER2_SEGMASK64 ((hammer2_off_t)HAMMER2_SEGMASK)
#define HAMMER2_UUID_STRING "5cbb9ad1-862d-11dc-a94d-01301bb8a9f5"
/*
* A HAMMER2 filesystem is always sized in multiples of 8MB.
*
* A 4MB segment is reserved at the beginning of each 2GB zone. This segment
* contains the volume header (or backup volume header), the free block
* table, and possibly other information in the future.
*
* 4MB = 64 x 64K blocks. Each 4MB segment is broken down as follows:
*
* +-----------------------+
* | Volume Hdr | block 0 volume header & alternates
* +-----------------------+ (first four zones only)
* | FreeBlk Section A | block 1-4
* +-----------------------+
* | FreeBlk Section B | block 5-8
* +-----------------------+
* | FreeBlk Section C | block 9-12
* +-----------------------+
* | FreeBlk Section D | block 13-16
* +-----------------------+
* | | block 17...63
* | reserved |
* | |
* +-----------------------+
*
* The first few 2GB zones contain volume headers and volume header backups.
* After that the volume header block# is reserved for future use. Similarly,
* there are many blocks related to various Freemap levels which are not
* used in every segment and those are also reserved for future use.
*
* Freemap (see the FREEMAP document)
*
* The freemap utilizes blocks #1-16 in 8 sets of 4 blocks. Each block in
* a set represents a level of depth in the freemap topology. Eight sets
* exist to prevent live updates from disturbing the state of the freemap
* were a crash/reboot to occur. That is, a live update is not committed
* until the update's flush reaches the volume root. There are FOUR volume
* roots representing the last four synchronization points, so the freemap
* must be consistent no matter which volume root is chosen by the mount
* code.
*
* Each freemap set is 4 x 64K blocks and represents the 2GB, 2TB, 2PB,
* and 2EB indirect map. The volume header itself has a set of 8 freemap
* blockrefs representing another 3 bits, giving us a total 64 bits of
* representable address space.
*
* The Level 0 64KB block represents 2GB of storage represented by
* (64 x struct hammer2_bmap_data). Each structure represents 2MB of storage
* and has a 256 bit bitmap, using 2 bits to represent a 16KB chunk of
* storage. These 2 bits represent the following states:
*
* 00 Free
* 01 (reserved) (Possibly partially allocated)
* 10 Possibly free
* 11 Allocated
*
* One important thing to note here is that the freemap resolution is 16KB,
* but the minimum storage allocation size is 1KB. The hammer2 vfs keeps
* track of sub-allocations in memory, which means that on a unmount or reboot
* the entire 16KB of a partially allocated block will be considered fully
* allocated. It is possible for fragmentation to build up over time, but
* defragmentation is fairly easy to accomplish since all modifications
* allocate a new block.
*
* The Second thing to note is that due to the way snapshots and inode
* replication works, deleting a file cannot immediately free the related
* space. Furthermore, deletions often do not bother to traverse the
* block subhierarchy being deleted. And to go even further, whole
* sub-directory trees can be deleted simply by deleting the directory inode
* at the top. So even though we have a symbol to represent a 'possibly free'
* block (binary 10), only the bulk free scanning code can actually use it.
* Normal 'rm's or other deletions do not.
*
* WARNING! ZONE_SEG and VOLUME_ALIGN must be a multiple of 1<<LEVEL0_RADIX
* (i.e. a multiple of 2MB). VOLUME_ALIGN must be >= ZONE_SEG.
*
* In Summary:
*
* (1) Modifications to freemap blocks 'allocate' a new copy (aka use a block
* from the next set). The new copy is reused until a flush occurs at
* which point the next modification will then rotate to the next set.
*
* (2) A total of 10 freemap sets is required.
*
* - 8 sets - 2 sets per volume header backup x 4 volume header backups
* - 2 sets used as backing store for the bulk freemap scan.
* - The freemap recovery scan which runs on-mount just uses the inactive
* set for whichever volume header was selected by the mount code.
*
*/
#define HAMMER2_VOLUME_ALIGN (8 * 1024 * 1024)
#define HAMMER2_VOLUME_ALIGN64 ((hammer2_off_t)HAMMER2_VOLUME_ALIGN)
#define HAMMER2_VOLUME_ALIGNMASK (HAMMER2_VOLUME_ALIGN - 1)
#define HAMMER2_VOLUME_ALIGNMASK64 ((hammer2_off_t)HAMMER2_VOLUME_ALIGNMASK)
#define HAMMER2_NEWFS_ALIGN (HAMMER2_VOLUME_ALIGN)
#define HAMMER2_NEWFS_ALIGN64 ((hammer2_off_t)HAMMER2_VOLUME_ALIGN)
#define HAMMER2_NEWFS_ALIGNMASK (HAMMER2_VOLUME_ALIGN - 1)
#define HAMMER2_NEWFS_ALIGNMASK64 ((hammer2_off_t)HAMMER2_NEWFS_ALIGNMASK)
#define HAMMER2_ZONE_BYTES64 (2LLU * 1024 * 1024 * 1024)
#define HAMMER2_ZONE_MASK64 (HAMMER2_ZONE_BYTES64 - 1)
#define HAMMER2_ZONE_SEG (4 * 1024 * 1024)
#define HAMMER2_ZONE_SEG64 ((hammer2_off_t)HAMMER2_ZONE_SEG)
#define HAMMER2_ZONE_BLOCKS_SEG (HAMMER2_ZONE_SEG / HAMMER2_PBUFSIZE)
#define HAMMER2_ZONE_FREEMAP_INC 5 /* 5 deep */
#define HAMMER2_ZONE_VOLHDR 0 /* volume header or backup */
#define HAMMER2_ZONE_FREEMAP_00 1 /* normal freemap rotation */
#define HAMMER2_ZONE_FREEMAP_01 6 /* normal freemap rotation */
#define HAMMER2_ZONE_FREEMAP_02 11 /* normal freemap rotation */
#define HAMMER2_ZONE_FREEMAP_03 16 /* normal freemap rotation */
#define HAMMER2_ZONE_FREEMAP_04 21 /* normal freemap rotation */
#define HAMMER2_ZONE_FREEMAP_05 26 /* normal freemap rotation */
#define HAMMER2_ZONE_FREEMAP_06 31 /* normal freemap rotation */
#define HAMMER2_ZONE_FREEMAP_07 36 /* normal freemap rotation */
#define HAMMER2_ZONE_FREEMAP_END 41 /* (non-inclusive) */
#define HAMMER2_ZONE_UNUSED41 41
#define HAMMER2_ZONE_UNUSED42 42
#define HAMMER2_ZONE_UNUSED43 43
#define HAMMER2_ZONE_UNUSED44 44
#define HAMMER2_ZONE_UNUSED45 45
#define HAMMER2_ZONE_UNUSED46 46
#define HAMMER2_ZONE_UNUSED47 47
#define HAMMER2_ZONE_UNUSED48 48
#define HAMMER2_ZONE_UNUSED49 49
#define HAMMER2_ZONE_UNUSED50 50
#define HAMMER2_ZONE_UNUSED51 51
#define HAMMER2_ZONE_UNUSED52 52
#define HAMMER2_ZONE_UNUSED53 53
#define HAMMER2_ZONE_UNUSED54 54
#define HAMMER2_ZONE_UNUSED55 55
#define HAMMER2_ZONE_UNUSED56 56
#define HAMMER2_ZONE_UNUSED57 57
#define HAMMER2_ZONE_UNUSED58 58
#define HAMMER2_ZONE_UNUSED59 59
#define HAMMER2_ZONE_UNUSED60 60
#define HAMMER2_ZONE_UNUSED61 61
#define HAMMER2_ZONE_UNUSED62 62
#define HAMMER2_ZONE_UNUSED63 63
#define HAMMER2_ZONE_END 64 /* non-inclusive */
#define HAMMER2_NFREEMAPS 8 /* FREEMAP_00 - FREEMAP_07 */
/* relative to FREEMAP_x */
#define HAMMER2_ZONEFM_LEVEL1 0 /* 1GB leafmap */
#define HAMMER2_ZONEFM_LEVEL2 1 /* 256GB indmap */
#define HAMMER2_ZONEFM_LEVEL3 2 /* 64TB indmap */
#define HAMMER2_ZONEFM_LEVEL4 3 /* 16PB indmap */
#define HAMMER2_ZONEFM_LEVEL5 4 /* 4EB indmap */
/* LEVEL6 is a set of 4 blockrefs in the volume header 16EB */
/*
* Freemap radix. Assumes a set-count of 4, 128-byte blockrefs,
* 32KB indirect block for freemap (LEVELN_PSIZE below).
*
* Leaf entry represents 4MB of storage broken down into a 512-bit
* bitmap, 2-bits per entry. So course bitmap item represents 16KB.
*/
#if HAMMER2_SET_COUNT != 4
#error "hammer2_disk.h - freemap assumes SET_COUNT is 4"
#endif
#define HAMMER2_FREEMAP_LEVEL6_RADIX 64 /* 16EB (end) */
#define HAMMER2_FREEMAP_LEVEL5_RADIX 62 /* 4EB */
#define HAMMER2_FREEMAP_LEVEL4_RADIX 54 /* 16PB */
#define HAMMER2_FREEMAP_LEVEL3_RADIX 46 /* 64TB */
#define HAMMER2_FREEMAP_LEVEL2_RADIX 38 /* 256GB */
#define HAMMER2_FREEMAP_LEVEL1_RADIX 30 /* 1GB */
#define HAMMER2_FREEMAP_LEVEL0_RADIX 22 /* 4MB (128by in l-1 leaf) */
#define HAMMER2_FREEMAP_LEVELN_PSIZE 32768 /* physical bytes */
#define HAMMER2_FREEMAP_LEVEL5_SIZE ((hammer2_off_t)1 << \
HAMMER2_FREEMAP_LEVEL5_RADIX)
#define HAMMER2_FREEMAP_LEVEL4_SIZE ((hammer2_off_t)1 << \
HAMMER2_FREEMAP_LEVEL4_RADIX)
#define HAMMER2_FREEMAP_LEVEL3_SIZE ((hammer2_off_t)1 << \
HAMMER2_FREEMAP_LEVEL3_RADIX)
#define HAMMER2_FREEMAP_LEVEL2_SIZE ((hammer2_off_t)1 << \
HAMMER2_FREEMAP_LEVEL2_RADIX)
#define HAMMER2_FREEMAP_LEVEL1_SIZE ((hammer2_off_t)1 << \
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))
/*
* 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 2MB 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 (128KB) block of storage. The storage is managed in 128 x 1KB
* 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 2MB. 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
* 32-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;
/*
* 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.
*
* (attr_tid) is only updated when the inode's specific attributes or regular
* file size has changed, and affects path lookups and stat. (attr_tid)
* represents a special cache coherency lock under the inode. The inode
* blockref's modify_tid will always cover it.
*
* (dirent_tid) is only updated when an entry under a directory inode has
* been created, deleted, renamed, or had its attributes change, and affects
* directory lookups and scans. (dirent_tid) represents another special cache
* coherency lock under the inode. The inode blockref's modify_tid will
* always cover it.
*/
#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 inheritence.
*/
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) */
struct hammer2_blockset 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 /* !_VFS_HAMMER2_DISK_H_ */