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/*-
* Copyright (c) 2007 The DragonFly Project. All rights reserved.
*
* This code is derived from software contributed to The DragonFly Project
* by Matthew Dillon <dillon@backplane.com>
*
* 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.
*
* $DragonFly: src/sys/vfs/hammer/hammer_disk.h,v 1.55 2008/11/13 02:18:43 dillon Exp $
* $FreeBSD$
*/
#ifndef VFS_HAMMER_DISK_H_
#define VFS_HAMMER_DISK_H_
#include <sys/endian.h>
#ifndef _SYS_UUID_H_
#include <sys/uuid.h>
#endif
/*
* The structures below represent the on-disk format for a HAMMER
* filesystem. Note that all fields for on-disk structures are naturally
* aligned. HAMMER uses little endian for fields in on-disk structures.
* HAMMER doesn't support big endian arch, but is planned.
*
* Most of HAMMER revolves around the concept of an object identifier. An
* obj_id is a 64 bit quantity which uniquely identifies a filesystem object
* FOR THE ENTIRE LIFE OF THE FILESYSTEM. This uniqueness allows backups
* and mirrors to retain varying amounts of filesystem history by removing
* any possibility of conflict through identifier reuse.
*
* A HAMMER filesystem may span multiple volumes.
*
* A HAMMER filesystem uses a 16K filesystem buffer size. All filesystem
* I/O is done in multiples of 16K.
*
* 64K X-bufs are used for blocks >= a file's 1MB mark.
*
* Per-volume storage limit: 52 bits 4096 TB
* Per-Zone storage limit: 60 bits 1 MTB
* Per-filesystem storage limit: 60 bits 1 MTB
*/
#define HAMMER_BUFSIZE 16384
#define HAMMER_XBUFSIZE 65536
#define HAMMER_HBUFSIZE (HAMMER_BUFSIZE / 2)
#define HAMMER_XDEMARC (1024 * 1024)
#define HAMMER_BUFMASK (HAMMER_BUFSIZE - 1)
#define HAMMER_XBUFMASK (HAMMER_XBUFSIZE - 1)
#define HAMMER_BUFSIZE64 ((uint64_t)HAMMER_BUFSIZE)
#define HAMMER_BUFMASK64 ((uint64_t)HAMMER_BUFMASK)
#define HAMMER_XBUFSIZE64 ((uint64_t)HAMMER_XBUFSIZE)
#define HAMMER_XBUFMASK64 ((uint64_t)HAMMER_XBUFMASK)
#define HAMMER_OFF_ZONE_MASK 0xF000000000000000ULL /* zone portion */
#define HAMMER_OFF_VOL_MASK 0x0FF0000000000000ULL /* volume portion */
#define HAMMER_OFF_SHORT_MASK 0x000FFFFFFFFFFFFFULL /* offset portion */
#define HAMMER_OFF_LONG_MASK 0x0FFFFFFFFFFFFFFFULL /* offset portion */
#define HAMMER_OFF_BAD ((hammer_off_t)-1)
#define HAMMER_BUFSIZE_DOALIGN(offset) \
(((offset) + HAMMER_BUFMASK) & ~HAMMER_BUFMASK)
#define HAMMER_BUFSIZE64_DOALIGN(offset) \
(((offset) + HAMMER_BUFMASK64) & ~HAMMER_BUFMASK64)
#define HAMMER_XBUFSIZE_DOALIGN(offset) \
(((offset) + HAMMER_XBUFMASK) & ~HAMMER_XBUFMASK)
#define HAMMER_XBUFSIZE64_DOALIGN(offset) \
(((offset) + HAMMER_XBUFMASK64) & ~HAMMER_XBUFMASK64)
/*
* The current limit of volumes that can make up a HAMMER FS
*/
#define HAMMER_MAX_VOLUMES 256
/*
* Reserved space for (future) header junk after the volume header.
*/
#define HAMMER_MIN_VOL_JUNK (HAMMER_BUFSIZE * 16) /* 256 KB */
#define HAMMER_MAX_VOL_JUNK HAMMER_MIN_VOL_JUNK
#define HAMMER_VOL_JUNK_SIZE HAMMER_MIN_VOL_JUNK
/*
* Hammer transaction ids are 64 bit unsigned integers and are usually
* synchronized with the time of day in nanoseconds.
*
* Hammer offsets are used for FIFO indexing and embed a cycle counter
* and volume number in addition to the offset. Most offsets are required
* to be 16 KB aligned.
*/
typedef uint64_t hammer_tid_t;
typedef uint64_t hammer_off_t;
typedef uint32_t hammer_crc_t;
typedef uuid_t hammer_uuid_t;
#define HAMMER_MIN_TID 0ULL /* unsigned */
#define HAMMER_MAX_TID 0xFFFFFFFFFFFFFFFFULL /* unsigned */
#define HAMMER_MIN_KEY -0x8000000000000000LL /* signed */
#define HAMMER_MAX_KEY 0x7FFFFFFFFFFFFFFFLL /* signed */
#define HAMMER_MIN_OBJID HAMMER_MIN_KEY /* signed */
#define HAMMER_MAX_OBJID HAMMER_MAX_KEY /* signed */
#define HAMMER_MIN_RECTYPE 0x0U /* unsigned */
#define HAMMER_MAX_RECTYPE 0xFFFFU /* unsigned */
#define HAMMER_MIN_OFFSET 0ULL /* unsigned */
#define HAMMER_MAX_OFFSET 0xFFFFFFFFFFFFFFFFULL /* unsigned */
/*
* hammer_off_t has several different encodings. Note that not all zones
* encode a vol_no. Zone bits are not a part of filesystem capacity as
* the zone bits aren't directly or indirectly mapped to physical volumes.
*
* In other words, HAMMER's logical filesystem offset consists of 64 bits,
* but the filesystem is considered 60 bits filesystem, not 64 bits.
* The maximum filesystem capacity is 1EB, not 16EB.
*
* zone 0: available, a big-block that contains the offset is unused
* zone 1 (z,v,o): raw volume relative (offset 0 is the volume header)
* zone 2 (z,v,o): raw buffer relative (offset 0 is the first buffer)
* zone 3 (z,o): undo/redo fifo - fixed zone-2 offset array in volume header
* zone 4 (z,v,o): freemap - only real blockmap
* zone 8 (z,v,o): B-Tree - actually zone-2 address
* zone 9 (z,v,o): meta - actually zone-2 address
* zone 10 (z,v,o): large-data - actually zone-2 address
* zone 11 (z,v,o): small-data - actually zone-2 address
* zone 15: unavailable, usually the offset is beyond volume size
*
* layer1/layer2 direct map:
* Maximum HAMMER filesystem capacity from volume aspect
* 2^8(max volumes) * 2^52(max volume size) = 2^60 = 1EB (long offset)
* <------------------------------------------------------------->
* 8bits 52bits (short offset)
* <------><----------------------------------------------------->
* zzzzvvvvvvvvoooo oooooooooooooooo oooooooooooooooo oooooooooooooooo
* ----111111111111 1111112222222222 222222222ooooooo oooooooooooooooo
* <-----------------><------------------><---------------------->
* 18bits 19bits 23bits
* <------------------------------------------------------------->
* 2^18(layer1) * 2^19(layer2) * 2^23(big-block) = 2^60 = 1EB
* Maximum HAMMER filesystem capacity from blockmap aspect
*
* volume#0 layout
* +-------------------------> offset 0 of a device/partition
* | volume header (1928 bytes)
* | the rest of header junk space (HAMMER_BUFSIZE aligned)
* +-------------------------> vol_bot_beg
* | boot area (HAMMER_BUFSIZE aligned)
* +-------------------------> vol_mem_beg
* | memory log (HAMMER_BUFSIZE aligned)
* +-------------------------> vol_buf_beg (physical offset of zone-2)
* | zone-4 big-block for layer1
* +-------------------------> vol_buf_beg + HAMMER_BIGBLOCK_SIZE
* | zone-4 big-blocks for layer2
* | ... (1 big-block per 4TB space)
* +-------------------------> vol_buf_beg + HAMMER_BIGBLOCK_SIZE * ...
* | zone-3 big-blocks for UNDO/REDO FIFO
* | ... (max 128 big-blocks)
* +-------------------------> vol_buf_beg + HAMMER_BIGBLOCK_SIZE * ...
* | zone-8 big-block for root B-Tree node/etc
* +-------------------------> vol_buf_beg + HAMMER_BIGBLOCK_SIZE * ...
* | zone-9 big-block for root inode/PFS/etc
* +-------------------------> vol_buf_beg + HAMMER_BIGBLOCK_SIZE * ...
* | zone-X big-blocks
* | ... (big-blocks for new zones after newfs_hammer)
* | ...
* | ...
* | ...
* | ...
* +-------------------------> vol_buf_end (HAMMER_BUFSIZE aligned)
* +-------------------------> end of a device/partition
*
* volume#N layout (0<N<256)
* +-------------------------> offset 0 of a device/partition
* | volume header (1928 bytes)
* | the rest of header junk space (HAMMER_BUFSIZE aligned)
* +-------------------------> vol_bot_beg
* | boot area (HAMMER_BUFSIZE aligned)
* +-------------------------> vol_mem_beg
* | memory log (HAMMER_BUFSIZE aligned)
* +-------------------------> vol_buf_beg (physical offset of zone-2)
* | zone-4 big-blocks for layer2
* | ... (1 big-block per 4TB space)
* +-------------------------> vol_buf_beg + HAMMER_BIGBLOCK_SIZE * ...
* | zone-X big-blocks
* | ... (unused until volume#(N-1) runs out of space)
* | ...
* | ...
* | ...
* | ...
* +-------------------------> vol_buf_end (HAMMER_BUFSIZE aligned)
* +-------------------------> end of a device/partition
*/
#define HAMMER_ZONE_RAW_VOLUME 0x1000000000000000ULL
#define HAMMER_ZONE_RAW_BUFFER 0x2000000000000000ULL
#define HAMMER_ZONE_UNDO 0x3000000000000000ULL
#define HAMMER_ZONE_FREEMAP 0x4000000000000000ULL
#define HAMMER_ZONE_RESERVED05 0x5000000000000000ULL /* not used */
#define HAMMER_ZONE_RESERVED06 0x6000000000000000ULL /* not used */
#define HAMMER_ZONE_RESERVED07 0x7000000000000000ULL /* not used */
#define HAMMER_ZONE_BTREE 0x8000000000000000ULL
#define HAMMER_ZONE_META 0x9000000000000000ULL
#define HAMMER_ZONE_LARGE_DATA 0xA000000000000000ULL
#define HAMMER_ZONE_SMALL_DATA 0xB000000000000000ULL
#define HAMMER_ZONE_RESERVED0C 0xC000000000000000ULL /* not used */
#define HAMMER_ZONE_RESERVED0D 0xD000000000000000ULL /* not used */
#define HAMMER_ZONE_RESERVED0E 0xE000000000000000ULL /* not used */
#define HAMMER_ZONE_UNAVAIL 0xF000000000000000ULL
#define HAMMER_ZONE_RAW_VOLUME_INDEX 1
#define HAMMER_ZONE_RAW_BUFFER_INDEX 2
#define HAMMER_ZONE_UNDO_INDEX 3
#define HAMMER_ZONE_FREEMAP_INDEX 4
#define HAMMER_ZONE_BTREE_INDEX 8
#define HAMMER_ZONE_META_INDEX 9
#define HAMMER_ZONE_LARGE_DATA_INDEX 10
#define HAMMER_ZONE_SMALL_DATA_INDEX 11
#define HAMMER_ZONE_UNAVAIL_INDEX 15
#define HAMMER_MAX_ZONES 16
#define HAMMER_ZONE(offset) ((offset) & HAMMER_OFF_ZONE_MASK)
#define hammer_is_zone_raw_volume(offset) \
(HAMMER_ZONE(offset) == HAMMER_ZONE_RAW_VOLUME)
#define hammer_is_zone_raw_buffer(offset) \
(HAMMER_ZONE(offset) == HAMMER_ZONE_RAW_BUFFER)
#define hammer_is_zone_undo(offset) \
(HAMMER_ZONE(offset) == HAMMER_ZONE_UNDO)
#define hammer_is_zone_freemap(offset) \
(HAMMER_ZONE(offset) == HAMMER_ZONE_FREEMAP)
#define hammer_is_zone_btree(offset) \
(HAMMER_ZONE(offset) == HAMMER_ZONE_BTREE)
#define hammer_is_zone_meta(offset) \
(HAMMER_ZONE(offset) == HAMMER_ZONE_META)
#define hammer_is_zone_large_data(offset) \
(HAMMER_ZONE(offset) == HAMMER_ZONE_LARGE_DATA)
#define hammer_is_zone_small_data(offset) \
(HAMMER_ZONE(offset) == HAMMER_ZONE_SMALL_DATA)
#define hammer_is_zone_unavail(offset) \
(HAMMER_ZONE(offset) == HAMMER_ZONE_UNAVAIL)
#define hammer_is_zone_data(offset) \
(hammer_is_zone_large_data(offset) || hammer_is_zone_small_data(offset))
#define hammer_is_index_record(zone) \
((zone) >= HAMMER_ZONE_BTREE_INDEX && \
(zone) < HAMMER_MAX_ZONES)
#define hammer_is_zone_record(offset) \
hammer_is_index_record(HAMMER_ZONE_DECODE(offset))
#define hammer_is_index_direct_xlated(zone) \
(((zone) == HAMMER_ZONE_RAW_BUFFER_INDEX) || \
((zone) == HAMMER_ZONE_FREEMAP_INDEX) || \
hammer_is_index_record(zone))
#define hammer_is_zone_direct_xlated(offset) \
hammer_is_index_direct_xlated(HAMMER_ZONE_DECODE(offset))
#define HAMMER_ZONE_ENCODE(zone, ham_off) \
(((hammer_off_t)(zone) << 60) | (ham_off))
#define HAMMER_ZONE_DECODE(ham_off) \
((int)(((hammer_off_t)(ham_off) >> 60)))
#define HAMMER_VOL_ENCODE(vol_no) \
((hammer_off_t)((vol_no) & 255) << 52)
#define HAMMER_VOL_DECODE(ham_off) \
((int)(((hammer_off_t)(ham_off) >> 52) & 255))
#define HAMMER_OFF_SHORT_ENCODE(offset) \
((hammer_off_t)(offset) & HAMMER_OFF_SHORT_MASK)
#define HAMMER_OFF_LONG_ENCODE(offset) \
((hammer_off_t)(offset) & HAMMER_OFF_LONG_MASK)
#define HAMMER_ENCODE(zone, vol_no, offset) \
(((hammer_off_t)(zone) << 60) | \
HAMMER_VOL_ENCODE(vol_no) | \
HAMMER_OFF_SHORT_ENCODE(offset))
#define HAMMER_ENCODE_RAW_VOLUME(vol_no, offset) \
HAMMER_ENCODE(HAMMER_ZONE_RAW_VOLUME_INDEX, vol_no, offset)
#define HAMMER_ENCODE_RAW_BUFFER(vol_no, offset) \
HAMMER_ENCODE(HAMMER_ZONE_RAW_BUFFER_INDEX, vol_no, offset)
#define HAMMER_ENCODE_UNDO(offset) \
HAMMER_ENCODE(HAMMER_ZONE_UNDO_INDEX, HAMMER_ROOT_VOLNO, offset)
#define HAMMER_ENCODE_FREEMAP(vol_no, offset) \
HAMMER_ENCODE(HAMMER_ZONE_FREEMAP_INDEX, vol_no, offset)
/*
* Translate a zone address to zone-X address.
*/
#define hammer_xlate_to_zoneX(zone, offset) \
HAMMER_ZONE_ENCODE((zone), (offset) & ~HAMMER_OFF_ZONE_MASK)
#define hammer_xlate_to_zone2(offset) \
hammer_xlate_to_zoneX(HAMMER_ZONE_RAW_BUFFER_INDEX, (offset))
#define hammer_data_zone(data_len) \
(((data_len) >= HAMMER_BUFSIZE) ? \
HAMMER_ZONE_LARGE_DATA : \
HAMMER_ZONE_SMALL_DATA)
#define hammer_data_zone_index(data_len) \
(((data_len) >= HAMMER_BUFSIZE) ? \
HAMMER_ZONE_LARGE_DATA_INDEX : \
HAMMER_ZONE_SMALL_DATA_INDEX)
/*
* Big-Block backing store
*
* A blockmap is a two-level map which translates a blockmap-backed zone
* offset into a raw zone 2 offset. The layer 1 handles 18 bits and the
* layer 2 handles 19 bits. The 8M big-block size is 23 bits so two
* layers gives us 18+19+23 = 60 bits of address space.
*
* When using hinting for a blockmap lookup, the hint is lost when the
* scan leaves the HINTBLOCK, which is typically several BIGBLOCK's.
* HINTBLOCK is a heuristic.
*/
#define HAMMER_HINTBLOCK_SIZE (HAMMER_BIGBLOCK_SIZE * 4)
#define HAMMER_HINTBLOCK_MASK64 ((uint64_t)HAMMER_HINTBLOCK_SIZE - 1)
#define HAMMER_BIGBLOCK_SIZE (8192 * 1024)
#define HAMMER_BIGBLOCK_SIZE64 ((uint64_t)HAMMER_BIGBLOCK_SIZE)
#define HAMMER_BIGBLOCK_MASK (HAMMER_BIGBLOCK_SIZE - 1)
#define HAMMER_BIGBLOCK_MASK64 ((uint64_t)HAMMER_BIGBLOCK_SIZE - 1)
#define HAMMER_BIGBLOCK_BITS 23
#if 0
#define HAMMER_BIGBLOCK_OVERFILL (6144 * 1024)
#endif
#if (1 << HAMMER_BIGBLOCK_BITS) != HAMMER_BIGBLOCK_SIZE
#error "HAMMER_BIGBLOCK_BITS BROKEN"
#endif
#define HAMMER_BUFFERS_PER_BIGBLOCK \
(HAMMER_BIGBLOCK_SIZE / HAMMER_BUFSIZE)
#define HAMMER_BUFFERS_PER_BIGBLOCK_MASK \
(HAMMER_BUFFERS_PER_BIGBLOCK - 1)
#define HAMMER_BUFFERS_PER_BIGBLOCK_MASK64 \
((hammer_off_t)HAMMER_BUFFERS_PER_BIGBLOCK_MASK)
#define HAMMER_BIGBLOCK_DOALIGN(offset) \
(((offset) + HAMMER_BIGBLOCK_MASK64) & ~HAMMER_BIGBLOCK_MASK64)
/*
* Maximum number of mirrors operating in master mode (multi-master
* clustering and mirroring). Note that HAMMER1 does not support
* multi-master clustering as of 2015.
*/
#define HAMMER_MAX_MASTERS 16
/*
* The blockmap is somewhat of a degenerate structure. HAMMER only actually
* uses it in its original incarnation to implement the freemap.
*
* zone:1 raw volume (no blockmap)
* zone:2 raw buffer (no blockmap)
* zone:3 undomap (direct layer2 array in volume header)
* zone:4 freemap (the only real blockmap)
* zone:8-15 zone id used to classify big-block only, address is actually
* a zone-2 address.
*/
typedef struct hammer_blockmap {
hammer_off_t phys_offset; /* zone-2 offset only used by zone-4 */
hammer_off_t first_offset; /* zone-X offset only used by zone-3 */
hammer_off_t next_offset; /* zone-X offset for allocation */
hammer_off_t alloc_offset; /* zone-X offset only used by zone-3 */
uint32_t reserved01;
hammer_crc_t entry_crc;
} *hammer_blockmap_t;
#define HAMMER_BLOCKMAP_CRCSIZE \
offsetof(struct hammer_blockmap, entry_crc)
/*
* The blockmap is a 2-layer entity made up of big-blocks. The first layer
* contains 262144 32-byte entries (18 bits), the second layer contains
* 524288 16-byte entries (19 bits), representing 8MB (23 bit) blockmaps.
* 18+19+23 = 60 bits. The top four bits are the zone id.
*
* Currently only the freemap utilizes both layers in all their glory.
* All primary data/meta-data zones actually encode a zone-2 address
* requiring no real blockmap translation.
*
* The freemap uses the upper 8 bits of layer-1 to identify the volume,
* thus any space allocated via the freemap can be directly translated
* to a zone:2 (or zone:8-15) address.
*
* zone-X blockmap offset: [zone:4][layer1:18][layer2:19][big-block:23]
*/
/*
* 32 bytes layer1 entry for 8MB big-block.
* A big-block can hold 2^23 / 2^5 = 2^18 layer1 entries,
* which equals bits assigned for layer1 in zone-2 address.
*/
typedef struct hammer_blockmap_layer1 {
hammer_off_t blocks_free; /* big-blocks free */
hammer_off_t phys_offset; /* UNAVAIL or zone-2 */
hammer_off_t reserved01;
hammer_crc_t layer2_crc; /* xor'd crc's of HAMMER_BLOCKSIZE */
/* (not yet used) */
hammer_crc_t layer1_crc; /* MUST BE LAST FIELD OF STRUCTURE*/
} *hammer_blockmap_layer1_t;
#define HAMMER_LAYER1_CRCSIZE \
offsetof(struct hammer_blockmap_layer1, layer1_crc)
/*
* 16 bytes layer2 entry for 8MB big-blocks.
* A big-block can hold 2^23 / 2^4 = 2^19 layer2 entries,
* which equals bits assigned for layer2 in zone-2 address.
*
* NOTE: bytes_free is signed and can legally go negative if/when data
* de-dup occurs. This field will never go higher than
* HAMMER_BIGBLOCK_SIZE. If exactly HAMMER_BIGBLOCK_SIZE
* the big-block is completely free.
*/
typedef struct hammer_blockmap_layer2 {
uint8_t zone; /* typed allocation zone */
uint8_t reserved01;
uint16_t reserved02;
uint32_t append_off; /* allocatable space index */
int32_t bytes_free; /* bytes free within this big-block */
hammer_crc_t entry_crc;
} *hammer_blockmap_layer2_t;
#define HAMMER_LAYER2_CRCSIZE \
offsetof(struct hammer_blockmap_layer2, entry_crc)
#define HAMMER_BLOCKMAP_UNAVAIL ((hammer_off_t)-1LL)
#define HAMMER_BLOCKMAP_RADIX1 /* 2^18 = 262144 */ \
((int)(HAMMER_BIGBLOCK_SIZE / sizeof(struct hammer_blockmap_layer1)))
#define HAMMER_BLOCKMAP_RADIX2 /* 2^19 = 524288 */ \
((int)(HAMMER_BIGBLOCK_SIZE / sizeof(struct hammer_blockmap_layer2)))
#define HAMMER_BLOCKMAP_LAYER1 /* 2^(18+19+23) = 1EB */ \
(HAMMER_BLOCKMAP_RADIX1 * HAMMER_BLOCKMAP_LAYER2)
#define HAMMER_BLOCKMAP_LAYER2 /* 2^(19+23) = 4TB */ \
(HAMMER_BLOCKMAP_RADIX2 * HAMMER_BIGBLOCK_SIZE64)
#define HAMMER_BLOCKMAP_LAYER1_MASK (HAMMER_BLOCKMAP_LAYER1 - 1)
#define HAMMER_BLOCKMAP_LAYER2_MASK (HAMMER_BLOCKMAP_LAYER2 - 1)
#define HAMMER_BLOCKMAP_LAYER2_DOALIGN(offset) \
(((offset) + HAMMER_BLOCKMAP_LAYER2_MASK) & \
~HAMMER_BLOCKMAP_LAYER2_MASK)
/*
* Index within layer1 or layer2 big-block for the entry representing
* a zone-2 physical offset.
*/
#define HAMMER_BLOCKMAP_LAYER1_INDEX(zone2_offset) \
((int)(((zone2_offset) & HAMMER_BLOCKMAP_LAYER1_MASK) / \
HAMMER_BLOCKMAP_LAYER2))
#define HAMMER_BLOCKMAP_LAYER2_INDEX(zone2_offset) \
((int)(((zone2_offset) & HAMMER_BLOCKMAP_LAYER2_MASK) / \
HAMMER_BIGBLOCK_SIZE64))
/*
* Byte offset within layer1 or layer2 big-block for the entry representing
* a zone-2 physical offset. Multiply the index by sizeof(blockmap_layer).
*/
#define HAMMER_BLOCKMAP_LAYER1_OFFSET(zone2_offset) \
(HAMMER_BLOCKMAP_LAYER1_INDEX(zone2_offset) * \
sizeof(struct hammer_blockmap_layer1))
#define HAMMER_BLOCKMAP_LAYER2_OFFSET(zone2_offset) \
(HAMMER_BLOCKMAP_LAYER2_INDEX(zone2_offset) * \
sizeof(struct hammer_blockmap_layer2))
/*
* Move on to offset 0 of the next layer1 or layer2.
*/
#define HAMMER_ZONE_LAYER1_NEXT_OFFSET(offset) \
(((offset) + HAMMER_BLOCKMAP_LAYER2) & ~HAMMER_BLOCKMAP_LAYER2_MASK)
#define HAMMER_ZONE_LAYER2_NEXT_OFFSET(offset) \
(((offset) + HAMMER_BIGBLOCK_SIZE) & ~HAMMER_BIGBLOCK_MASK64)
/*
* HAMMER UNDO parameters. The UNDO fifo is mapped directly in the volume
* header with an array of zone-2 offsets. A maximum of (128x8MB) = 1GB,
* and minimum of (64x8MB) = 512MB may be reserved. The size of the undo
* fifo is usually set a newfs time.
*/
#define HAMMER_MIN_UNDO_BIGBLOCKS 64
#define HAMMER_MAX_UNDO_BIGBLOCKS 128
/*
* All on-disk HAMMER structures which make up elements of the UNDO FIFO
* contain a hammer_fifo_head and hammer_fifo_tail structure. This structure
* contains all the information required to validate the fifo element
* and to scan the fifo in either direction. The head is typically embedded
* in higher level hammer on-disk structures while the tail is typically
* out-of-band. hdr_size is the size of the whole mess, including the tail.
*
* All undo structures are guaranteed to not cross a 16K filesystem
* buffer boundary. Most undo structures are fairly small. Data spaces
* are not immediately reused by HAMMER so file data is not usually recorded
* as part of an UNDO.
*
* PAD elements are allowed to take up only 8 bytes of space as a special
* case, containing only hdr_signature, hdr_type, and hdr_size fields,
* and with the tail overloaded onto the head structure for 8 bytes total.
*
* Every undo record has a sequence number. This number is unrelated to
* transaction ids and instead collects the undo transactions associated
* with a single atomic operation. A larger transactional operation, such
* as a remove(), may consist of several smaller atomic operations
* representing raw meta-data operations.
*
* HAMMER VERSION 4 CHANGES
*
* In HAMMER version 4 the undo structure alignment is reduced from 16384
* to 512 bytes in order to ensure that each 512 byte sector begins with
* a header. The hdr_seq field in the header is a 32 bit sequence number
* which allows the recovery code to detect missing sectors
* without relying on the 32-bit crc and to definitively identify the current
* undo sequence space without having to rely on information from the volume
* header. In addition, new REDO entries in the undo space are used to
* record write, write/extend, and transaction id updates.
*
* The grand result is:
*
* (1) The volume header no longer needs to be synchronized for most
* flush and fsync operations.
*
* (2) Most fsync operations need only lay down REDO records
*
* (3) Data overwrite for nohistory operations covered by REDO records
* can be supported (instead of rolling a new block allocation),
* by rolling UNDO for the prior contents of the data.
*
* HAMMER VERSION 5 CHANGES
*
* Hammer version 5 contains a minor adjustment making layer2's bytes_free
* field signed, allowing dedup to push it into the negative domain.
*/
#define HAMMER_HEAD_ALIGN 8
#define HAMMER_HEAD_ALIGN_MASK (HAMMER_HEAD_ALIGN - 1)
#define HAMMER_HEAD_DOALIGN(bytes) \
(((bytes) + HAMMER_HEAD_ALIGN_MASK) & ~HAMMER_HEAD_ALIGN_MASK)
#define HAMMER_UNDO_ALIGN 512
#define HAMMER_UNDO_ALIGN64 ((uint64_t)512)
#define HAMMER_UNDO_MASK (HAMMER_UNDO_ALIGN - 1)
#define HAMMER_UNDO_MASK64 (HAMMER_UNDO_ALIGN64 - 1)
#define HAMMER_UNDO_DOALIGN(offset) \
(((offset) + HAMMER_UNDO_MASK) & ~HAMMER_UNDO_MASK64)
typedef struct hammer_fifo_head {
uint16_t hdr_signature;
uint16_t hdr_type;
uint32_t hdr_size; /* Aligned size of the whole mess */
uint32_t hdr_seq; /* Sequence number */
hammer_crc_t hdr_crc; /* XOR crc up to field w/ crc after field */
} *hammer_fifo_head_t;
#define HAMMER_FIFO_HEAD_CRCOFF offsetof(struct hammer_fifo_head, hdr_crc)
typedef struct hammer_fifo_tail {
uint16_t tail_signature;
uint16_t tail_type;
uint32_t tail_size; /* aligned size of the whole mess */
} *hammer_fifo_tail_t;
/*
* Fifo header types.
*
* NOTE: 0x8000U part of HAMMER_HEAD_TYPE_PAD can be removed if the HAMMER
* version ever gets bumped again. It exists only to keep compatibility with
* older versions.
*/
#define HAMMER_HEAD_TYPE_PAD (0x0040U | 0x8000U)
#define HAMMER_HEAD_TYPE_DUMMY 0x0041U /* dummy entry w/seqno */
#define HAMMER_HEAD_TYPE_UNDO 0x0043U /* random UNDO information */
#define HAMMER_HEAD_TYPE_REDO 0x0044U /* data REDO / fast fsync */
#define HAMMER_HEAD_SIGNATURE 0xC84EU
#define HAMMER_TAIL_SIGNATURE 0xC74FU
/*
* Misc FIFO structures.
*
* UNDO - Raw meta-data media updates.
*/
typedef struct hammer_fifo_undo {
struct hammer_fifo_head head;
hammer_off_t undo_offset; /* zone-1,2 offset */
int32_t undo_data_bytes;
int32_t undo_reserved01;
/* followed by data */
} *hammer_fifo_undo_t;
/*
* REDO (HAMMER version 4+) - Logical file writes/truncates.
*
* REDOs contain information which will be duplicated in a later meta-data
* update, allowing fast write()+fsync() operations. REDOs can be ignored
* without harming filesystem integrity but must be processed if fsync()
* semantics are desired.
*
* Unlike UNDOs which are processed backwards within the recovery span,
* REDOs must be processed forwards starting further back (starting outside
* the recovery span).
*
* WRITE - Write logical file (with payload). Executed both
* out-of-span and in-span. Out-of-span WRITEs may be
* filtered out by TERMs.
*
* TRUNC - Truncate logical file (no payload). Executed both
* out-of-span and in-span. Out-of-span WRITEs may be
* filtered out by TERMs.
*
* TERM_* - Indicates meta-data was committed (if out-of-span) or
* will be rolled-back (in-span). Any out-of-span TERMs
* matching earlier WRITEs remove those WRITEs from
* consideration as they might conflict with a later data
* commit (which is not being rolled-back).
*
* SYNC - The earliest in-span SYNC (the last one when scanning
* backwards) tells the recovery code how far out-of-span
* it must go to run REDOs.
*
* NOTE: WRITEs do not always have matching TERMs even under
* perfect conditions because truncations might remove the
* buffers from consideration. I/O problems can also remove
* buffers from consideration.
*
* TRUNCSs do not always have matching TERMs because several
* truncations may be aggregated together into a single TERM.
*/
typedef struct hammer_fifo_redo {
struct hammer_fifo_head head;
int64_t redo_objid; /* file being written */
hammer_off_t redo_offset; /* logical offset in file */
int32_t redo_data_bytes;
uint32_t redo_flags;
uint32_t redo_localization;
uint32_t redo_reserved01;
uint64_t redo_reserved02;
/* followed by data */
} *hammer_fifo_redo_t;
#define HAMMER_REDO_WRITE 0x00000001
#define HAMMER_REDO_TRUNC 0x00000002
#define HAMMER_REDO_TERM_WRITE 0x00000004
#define HAMMER_REDO_TERM_TRUNC 0x00000008
#define HAMMER_REDO_SYNC 0x00000010
typedef union hammer_fifo_any {
struct hammer_fifo_head head;
struct hammer_fifo_undo undo;
struct hammer_fifo_redo redo;
} *hammer_fifo_any_t;
/*
* Volume header types
*/
#define HAMMER_FSBUF_VOLUME 0xC8414D4DC5523031ULL /* HAMMER01 */
#define HAMMER_FSBUF_VOLUME_REV 0x313052C54D4D41C8ULL /* (reverse endian) */
/*
* HAMMER Volume header
*
* A HAMMER filesystem can be built from 1-256 block devices, each block
* device contains a volume header followed by however many buffers fit
* into the volume.
*
* One of the volumes making up a HAMMER filesystem is the root volume.
* The root volume is always volume #0 which is the first block device path
* specified by newfs_hammer(8). All HAMMER volumes have a volume header,
* however the root volume may be the only volume that has valid values for
* some fields in the header.
*
* Special field notes:
*
* vol_bot_beg - offset of boot area (mem_beg - bot_beg bytes)
* vol_mem_beg - offset of memory log (buf_beg - mem_beg bytes)
* vol_buf_beg - offset of the first buffer in volume
* vol_buf_end - offset of volume EOF (on buffer boundary)
*
* The memory log area allows a kernel to cache new records and data
* in memory without allocating space in the actual filesystem to hold
* the records and data. In the event that a filesystem becomes full,
* any records remaining in memory can be flushed to the memory log
* area. This allows the kernel to immediately return success.
*
* The buffer offset is a physical offset of zone-2 offset. The lower
* 52 bits of the zone-2 offset is added to the buffer offset of each
* volume to generate an actual I/O offset within the block device.
*
* NOTE: boot area and memory log are currently not used.
*/
/*
* Filesystem type string
*/
#define HAMMER_FSTYPE_STRING "DragonFly HAMMER"
/*
* These macros are only used by userspace when userspace commands either
* initialize or add a new HAMMER volume.
*/
#define HAMMER_BOOT_MINBYTES (32*1024)
#define HAMMER_BOOT_NOMBYTES (64LL*1024*1024)
#define HAMMER_BOOT_MAXBYTES (256LL*1024*1024)
#define HAMMER_MEM_MINBYTES (256*1024)
#define HAMMER_MEM_NOMBYTES (1LL*1024*1024*1024)
#define HAMMER_MEM_MAXBYTES (64LL*1024*1024*1024)
typedef struct hammer_volume_ondisk {
uint64_t vol_signature; /* HAMMER_FSBUF_VOLUME for a valid header */
/*
* These are relative to block device offset, not zone offsets.
*/
int64_t vol_bot_beg; /* offset of boot area */
int64_t vol_mem_beg; /* offset of memory log */
int64_t vol_buf_beg; /* offset of the first buffer in volume */
int64_t vol_buf_end; /* offset of volume EOF (on buffer boundary) */
int64_t vol_reserved01;
hammer_uuid_t vol_fsid; /* identify filesystem */
hammer_uuid_t vol_fstype; /* identify filesystem type */
char vol_label[64]; /* filesystem label */
int32_t vol_no; /* volume number within filesystem */
int32_t vol_count; /* number of volumes making up filesystem */
uint32_t vol_version; /* version control information */
hammer_crc_t vol_crc; /* header crc */
uint32_t vol_flags; /* volume flags */
uint32_t vol_rootvol; /* the root volume number (must be 0) */
uint32_t vol_reserved[8];
/*
* These fields are initialized and space is reserved in every
* volume making up a HAMMER filesytem, but only the root volume
* contains valid data. Note that vol0_stat_bigblocks does not
* include big-blocks for freemap and undomap initially allocated
* by newfs_hammer(8).
*/
int64_t vol0_stat_bigblocks; /* total big-blocks when fs is empty */
int64_t vol0_stat_freebigblocks;/* number of free big-blocks */
int64_t vol0_reserved01;
int64_t vol0_stat_inodes; /* for statfs only */
int64_t vol0_reserved02;
hammer_off_t vol0_btree_root; /* B-Tree root offset in zone-8 */
hammer_tid_t vol0_next_tid; /* highest partially synchronized TID */
hammer_off_t vol0_reserved03;
/*
* Blockmaps for zones. Not all zones use a blockmap. Note that
* the entire root blockmap is cached in the hammer_mount structure.
*/
struct hammer_blockmap vol0_blockmap[HAMMER_MAX_ZONES];
/*
* Array of zone-2 addresses for undo FIFO.
*/
hammer_off_t vol0_undo_array[HAMMER_MAX_UNDO_BIGBLOCKS];
} *hammer_volume_ondisk_t;
#define HAMMER_ROOT_VOLNO 0
#define HAMMER_VOLF_NEEDFLUSH 0x0004 /* volume needs flush */
#define HAMMER_VOL_CRCSIZE1 \
offsetof(struct hammer_volume_ondisk, vol_crc)
#define HAMMER_VOL_CRCSIZE2 \
(sizeof(struct hammer_volume_ondisk) - HAMMER_VOL_CRCSIZE1 - \
sizeof(hammer_crc_t))
#define HAMMER_VOL_VERSION_MIN 1 /* minimum supported version */
#define HAMMER_VOL_VERSION_DEFAULT 7 /* newfs default version */
#define HAMMER_VOL_VERSION_WIP 8 /* version >= this is WIP */
#define HAMMER_VOL_VERSION_MAX 7 /* maximum supported version */
#define HAMMER_VOL_VERSION_ONE 1
#define HAMMER_VOL_VERSION_TWO 2 /* new dirent layout (2.3+) */
#define HAMMER_VOL_VERSION_THREE 3 /* new snapshot layout (2.5+) */
#define HAMMER_VOL_VERSION_FOUR 4 /* new undo/flush (2.5+) */
#define HAMMER_VOL_VERSION_FIVE 5 /* dedup (2.9+) */
#define HAMMER_VOL_VERSION_SIX 6 /* DIRHASH_ALG1 */
#define HAMMER_VOL_VERSION_SEVEN 7 /* use the faster iscsi_crc */
/*
* Translate a zone-2 address to physical address
*/
#define hammer_xlate_to_phys(volume, zone2_offset) \
((volume)->vol_buf_beg + HAMMER_OFF_SHORT_ENCODE(zone2_offset))
/*
* Translate a zone-3 address to zone-2 address
*/
#define HAMMER_UNDO_INDEX(zone3_offset) \
(HAMMER_OFF_SHORT_ENCODE(zone3_offset) / HAMMER_BIGBLOCK_SIZE)
#define hammer_xlate_to_undo(volume, zone3_offset) \
((volume)->vol0_undo_array[HAMMER_UNDO_INDEX(zone3_offset)] + \
(zone3_offset & HAMMER_BIGBLOCK_MASK64))
/*
* Effective per-volume filesystem capacity including big-blocks for layer1/2
*/
#define HAMMER_VOL_BUF_SIZE(volume) \
((volume)->vol_buf_end - (volume)->vol_buf_beg)
/*
* Record types are fairly straightforward. The B-Tree includes the record
* type in its index sort.
*/
#define HAMMER_RECTYPE_UNKNOWN 0x0000
#define HAMMER_RECTYPE_INODE 0x0001 /* inode in obj_id space */
#define HAMMER_RECTYPE_DATA 0x0010
#define HAMMER_RECTYPE_DIRENTRY 0x0011
#define HAMMER_RECTYPE_DB 0x0012
#define HAMMER_RECTYPE_EXT 0x0013 /* ext attributes */
#define HAMMER_RECTYPE_FIX 0x0014 /* fixed attribute */
#define HAMMER_RECTYPE_PFS 0x0015 /* PFS management */
#define HAMMER_RECTYPE_SNAPSHOT 0x0016 /* Snapshot management */
#define HAMMER_RECTYPE_CONFIG 0x0017 /* hammer cleanup config */
#define HAMMER_RECTYPE_MAX 0xFFFF
#define HAMMER_RECTYPE_ENTRY_START (HAMMER_RECTYPE_INODE + 1)
#define HAMMER_RECTYPE_CLEAN_START HAMMER_RECTYPE_EXT
#define HAMMER_FIXKEY_SYMLINK 1
#define HAMMER_OBJTYPE_UNKNOWN 0 /* never exists on-disk as unknown */
#define HAMMER_OBJTYPE_DIRECTORY 1
#define HAMMER_OBJTYPE_REGFILE 2
#define HAMMER_OBJTYPE_DBFILE 3
#define HAMMER_OBJTYPE_FIFO 4
#define HAMMER_OBJTYPE_CDEV 5
#define HAMMER_OBJTYPE_BDEV 6
#define HAMMER_OBJTYPE_SOFTLINK 7
#define HAMMER_OBJTYPE_PSEUDOFS 8 /* pseudo filesystem obj */
#define HAMMER_OBJTYPE_SOCKET 9
/*
* HAMMER inode attribute data
*
* The data reference for a HAMMER inode points to this structure. Any
* modifications to the contents of this structure will result in a
* replacement operation.
*
* parent_obj_id is only valid for directories (which cannot be hard-linked),
* and specifies the parent directory obj_id. This field will also be set
* for non-directory inodes as a recovery aid, but can wind up holding
* stale information. However, since object id's are not reused, the worse
* that happens is that the recovery code is unable to use it.
* A parent_obj_id of 0 means it's a root inode of root or non-root PFS.
*
* NOTE: Future note on directory hardlinks. We can implement a record type
* which allows us to point to multiple parent directories.
*/
typedef struct hammer_inode_data {
uint16_t version; /* inode data version */
uint16_t mode; /* basic unix permissions */
uint32_t uflags; /* chflags */
uint32_t rmajor; /* used by device nodes */
uint32_t rminor; /* used by device nodes */
uint64_t ctime;
int64_t parent_obj_id; /* parent directory obj_id */
hammer_uuid_t uid;
hammer_uuid_t gid;
uint8_t obj_type;
uint8_t cap_flags; /* capability support flags (extension) */
uint16_t reserved01;
uint32_t reserved02;
uint64_t nlinks; /* hard links */
uint64_t size; /* filesystem object size */
union {
char symlink[24]; /* HAMMER_INODE_BASESYMLEN */
} ext;
uint64_t mtime; /* mtime must be second-to-last */
uint64_t atime; /* atime must be last */
} *hammer_inode_data_t;
/*
* Neither mtime nor atime upates are CRCd by the B-Tree element.
* mtime updates have UNDO, atime updates do not.
*/
#define HAMMER_INODE_CRCSIZE \
offsetof(struct hammer_inode_data, mtime)
#define HAMMER_INODE_DATA_VERSION 1
#define HAMMER_OBJID_ROOT 1 /* root inodes # */
#define HAMMER_INODE_BASESYMLEN 24 /* see ext.symlink */
/*
* Capability & implementation flags.
*
* HAMMER_INODE_CAP_DIR_LOCAL_INO - Use inode B-Tree localization
* for directory entries. Also see HAMMER_DIR_INODE_LOCALIZATION().
*/
#define HAMMER_INODE_CAP_DIRHASH_MASK 0x03 /* directory: hash algorithm */
#define HAMMER_INODE_CAP_DIRHASH_ALG0 0x00
#define HAMMER_INODE_CAP_DIRHASH_ALG1 0x01
#define HAMMER_INODE_CAP_DIRHASH_ALG2 0x02
#define HAMMER_INODE_CAP_DIRHASH_ALG3 0x03
#define HAMMER_INODE_CAP_DIR_LOCAL_INO 0x04 /* use inode localization */
#define HAMMER_DATA_DOALIGN(offset) \
(((offset) + 15) & ~15)
#define HAMMER_DATA_DOALIGN_WITH(type, offset) \
(((type)(offset) + 15) & (~(type)15))
/*
* A HAMMER directory entry associates a HAMMER filesystem object with a
* namespace. It is hooked into a pseudo-filesystem (with its own inode
* numbering space) in the filesystem by setting the high 16 bits of the
* localization field. The low 16 bits must be 0 and are reserved for
* future use.
*
* Directory entries are indexed with a 128 bit namekey rather then an
* offset. A portion of the namekey is an iterator/randomizer to deal
* with collisions.
*
* NOTE: leaf.base.obj_type from the related B-Tree leaf entry holds
* the filesystem object type of obj_id, e.g. a den_type equivalent.
* It is not stored in hammer_direntry_data.
*
* NOTE: name field / the filename data reference is NOT terminated with \0.
*/
typedef struct hammer_direntry_data {
int64_t obj_id; /* object being referenced */
uint32_t localization; /* identify pseudo-filesystem */
uint32_t reserved01;
char name[16]; /* name (extended) */
} *hammer_direntry_data_t;
#define HAMMER_ENTRY_NAME_OFF offsetof(struct hammer_direntry_data, name[0])
#define HAMMER_ENTRY_SIZE(nlen) offsetof(struct hammer_direntry_data, name[nlen])
/*
* Symlink data which does not fit in the inode is stored in a separate
* FIX type record.
*/
typedef struct hammer_symlink_data {
char name[16]; /* name (extended) */
} *hammer_symlink_data_t;
#define HAMMER_SYMLINK_NAME_OFF offsetof(struct hammer_symlink_data, name[0])
/*
* The root inode for the primary filesystem and root inode for any
* pseudo-fs may be tagged with an optional data structure using
* HAMMER_RECTYPE_PFS and localization id. This structure allows
* the node to be used as a mirroring master or slave.
*
* When operating as a slave CD's into the node automatically become read-only
* and as-of sync_end_tid.
*
* When operating as a master the read PFSD info sets sync_end_tid to
* the most recently flushed TID.
*
* sync_low_tid is not yet used but will represent the highest pruning
* end-point, after which full history is available.
*
* We need to pack this structure making it equally sized on both 32-bit and
* 64-bit machines as it is part of struct hammer_ioc_mrecord_pfs which is
* send over the wire in hammer mirror operations. Only on 64-bit machines
* the size of this struct differ when packed or not. This leads us to the
* situation where old 64-bit systems (using the non-packed structure),
* which were never able to mirror to/from 32-bit systems, are now no longer
* able to mirror to/from newer 64-bit systems (using the packed structure).
*/
struct hammer_pseudofs_data {
hammer_tid_t sync_low_tid; /* full history beyond this point */
hammer_tid_t sync_beg_tid; /* earliest tid w/ full history avail */
hammer_tid_t sync_end_tid; /* current synchronizatoin point */
uint64_t sync_beg_ts; /* real-time of last completed sync */
uint64_t sync_end_ts; /* initiation of current sync cycle */
hammer_uuid_t shared_uuid; /* shared uuid (match required) */
hammer_uuid_t unique_uuid; /* unique uuid of this master/slave */
int32_t reserved01; /* reserved for future master_id */
int32_t mirror_flags; /* misc flags */
char label[64]; /* filesystem space label */
char snapshots[64]; /* softlink dir for pruning */
int32_t reserved02; /* was prune_{time,freq} */
int32_t reserved03; /* was reblock_{time,freq} */
int32_t reserved04; /* was snapshot_freq */
int32_t prune_min; /* do not prune recent history */
int32_t prune_max; /* do not retain history beyond here */
int32_t reserved[16];
} __packed;
typedef struct hammer_pseudofs_data *hammer_pseudofs_data_t;
#define HAMMER_PFSD_SLAVE 0x00000001
#define HAMMER_PFSD_DELETED 0x80000000
#define hammer_is_pfs_slave(pfsd) \
(((pfsd)->mirror_flags & HAMMER_PFSD_SLAVE) != 0)
#define hammer_is_pfs_master(pfsd) \
(!hammer_is_pfs_slave(pfsd))
#define hammer_is_pfs_deleted(pfsd) \
(((pfsd)->mirror_flags & HAMMER_PFSD_DELETED) != 0)
#define HAMMER_MAX_PFS 65536
#define HAMMER_MAX_PFSID (HAMMER_MAX_PFS - 1)
#define HAMMER_ROOT_PFSID 0
/*
* Snapshot meta-data { Objid = HAMMER_OBJID_ROOT, Key = tid, rectype = SNAPSHOT }.
*
* Snapshot records replace the old <fs>/snapshots/<softlink> methodology. Snapshot
* records are mirrored but may be independantly managed once they are laid down on
* a slave.
*
* NOTE: The b-tree key is signed, the tid is not, so callers must still sort the
* results.
*
* NOTE: Reserved fields must be zero (as usual)
*/
typedef struct hammer_snapshot_data {
hammer_tid_t tid; /* the snapshot TID itself (== key) */
uint64_t ts; /* real-time when snapshot was made */
uint64_t reserved01;
uint64_t reserved02;
char label[64]; /* user-supplied description */
uint64_t reserved03[4];
} *hammer_snapshot_data_t;
/*
* Config meta-data { ObjId = HAMMER_OBJID_ROOT, Key = 0, rectype = CONFIG }.
*
* Used to store the hammer cleanup config. This data is not mirrored.
*/
typedef struct hammer_config_data {
char text[1024];
} *hammer_config_data_t;
/*
* Rollup various structures embedded as record data
*/
typedef union hammer_data_ondisk {
struct hammer_direntry_data entry;
struct hammer_inode_data inode;
struct hammer_symlink_data symlink;
struct hammer_pseudofs_data pfsd;
struct hammer_snapshot_data snap;
struct hammer_config_data config;
} *hammer_data_ondisk_t;
#define HAMMER_DIR_INODE_LOCALIZATION(ino_data) \
(((ino_data)->cap_flags & HAMMER_INODE_CAP_DIR_LOCAL_INO) ? \
HAMMER_LOCALIZE_INODE : \
HAMMER_LOCALIZE_MISC)
#endif /* !VFS_HAMMER_DISK_H_ */