Как ZFS хранит данные

Zfs является достаточно популярной файловой системой для долговременного хранения данных. Кроме того она обеспечивает целостность записанных данных, сохраняя вместе с данными и их контрольные суммы. Механизм контрольных сумм позволяет выявить, и при наличии избыточности восстановить, поврежденные данные.

В данной статье на практическом примере производится разбор, как и куда zfs сохраняет данные.

Непосредственно для доступа к данным мы не будем использовать утилиту zdb, а попробуем с помощью radare2 посмотреть непосредственно на байты которые записаны на диске.

О zfs

Zfs(Zettabyte File System) это COW(copy on write) файловая система, созданная в Sun для операционной системы Solaris.

Одним из основных преимуществ этой файловой системы считается использование контрольных сумм не только для метаданных но и для данных пользователя.

Дисковая структура zfs

Для более подробного разбора компонентов zfs рекомендуется обратится к официальной документации ZFS On-Disk Specification от Sun.

Виртуальные устройства

Пул zfs состоит из виртуальных устройств (далее vdev). Более детальная информация нам сейчас не нужна, поэтому идем далее. Более детальная информация нам сейчас не нужна, поэтому идем далее, отметим только что vdev существует два вида логическое и физическое виртуальное устройство.

Метка

На каждом физическом виртуальном устройстве хранится четыре метки (на рисунке L0, L1, L2 и L3).

Метка

Boot-блок

Непосредственно после меток L0 и L1 выделено 3,5 Мб пространства, зарезервированного для будущего использования.

Точка отсчета uberblock

В отличии от остальных объектов zfs положение меток строго фиксировано и обновление их происходит в два шага, сначала обновляются метки L0 и L2 затем L1 и L3. Для данной статьи из данных записанных в метке нас будет интересовать только uberblock, рассмотрим его подробнее.

Uberblock

Uberblock представлен следующей структурой:

struct uberblock { 	uint64_t	ub_magic;	/* UBERBLOCK_MAGIC		*/ 	uint64_t	ub_version;	/* SPA_VERSION			*/ 	uint64_t	ub_txg;		/* txg of last sync		*/ 	uint64_t	ub_guid_sum;	/* sum of all vdev guids	*/ 	uint64_t	ub_timestamp;	/* UTC time of last sync	*/ 	blkptr_t	ub_rootbp;	/* MOS objset_phys_t		*/ 	/* highest SPA_VERSION supported by software that wrote this txg */ 	uint64_t	ub_software_version; }; 

Опишем некоторые поля:

ub_txg
Номер транзакции
ub_timestamp
Содержит время записи uberblock (в UTC формате)
ub_rootbp
Ссылка на Meta Object Set (В zfs ссылки на блоки представлены структурой blkptr_t, будет описана ниже).

Ссылки на блоки (blkptr_t)

Ссылки на блоки представляют собой следующую структуру:

typedef struct blkptr { 	dva_t		blk_dva[SPA_DVAS_PER_BP]; /* Data Virtual Addresses */ 	uint64_t	blk_prop;	/* size, compression, type, etc	    */ 	uint64_t	blk_pad[2];	/* Extra space for the future	    */ 	uint64_t	blk_phys_birth;	/* txg when block was allocated	    */ 	uint64_t	blk_birth;	/* transaction group at birth	    */ 	uint64_t	blk_fill;	/* fill count			    */ 	zio_cksum_t	blk_cksum;	/* 256-bit checksum		    */ } blkptr_t; /*  * All SPA data is represented by 128-bit data virtual addresses (DVAs).  * The members of the dva_t should be considered opaque outside the SPA.  */ typedef struct dva { 	uint64_t	dva_word[2]; } dva_t; /*  * Each block has a 256-bit checksum -- strong enough for cryptographic hashes.  */ typedef struct zio_cksum { 	uint64_t	zc_word[4]; } zio_cksum_t; 

Если представить в виде массива байт то получится следующее изображение

image

Наиболее важные поля
dva_t
Виртуальный адрес данных. В поле offset хранится смещение в секторах (512 байт).
На изображении выше это строки 0~5.
blk_prop
В соответствующих полях записан тип, размер, уровень косвенности блока и т.п.
type преобразеется в перечесление dmu_object_type. А поля cksum и comp в zio_checksum и zio_compress соответственно.

typedef enum dmu_object_type { 	DMU_OT_NONE, 	/* general: */ 	DMU_OT_OBJECT_DIRECTORY,	/* ZAP */ 	DMU_OT_OBJECT_ARRAY,		/* UINT64 */ 	DMU_OT_PACKED_NVLIST,		/* UINT8 (XDR by nvlist_pack/unpack) */ 	DMU_OT_PACKED_NVLIST_SIZE,	/* UINT64 */ 	DMU_OT_BPOBJ,			/* UINT64 */ 	DMU_OT_BPOBJ_HDR,		/* UINT64 */ 	/* spa: */ 	DMU_OT_SPACE_MAP_HEADER,	/* UINT64 */ 	DMU_OT_SPACE_MAP,		/* UINT64 */ 	/* zil: */ 	DMU_OT_INTENT_LOG,		/* UINT64 */ 	/* dmu: */ 	DMU_OT_DNODE,			/* DNODE */ 	DMU_OT_OBJSET,			/* OBJSET */ 	/* dsl: */ 	DMU_OT_DSL_DIR,			/* UINT64 */ 	DMU_OT_DSL_DIR_CHILD_MAP,	/* ZAP */ 	DMU_OT_DSL_DS_SNAP_MAP,		/* ZAP */ 	DMU_OT_DSL_PROPS,		/* ZAP */ 	DMU_OT_DSL_DATASET,		/* UINT64 */ 	/* zpl: */ 	DMU_OT_ZNODE,			/* ZNODE */ 	DMU_OT_OLDACL,			/* Old ACL */ 	DMU_OT_PLAIN_FILE_CONTENTS,	/* UINT8 */ 	DMU_OT_DIRECTORY_CONTENTS,	/* ZAP */ 	DMU_OT_MASTER_NODE,		/* ZAP */ 	DMU_OT_UNLINKED_SET,		/* ZAP */ 	/* zvol: */ 	DMU_OT_ZVOL,			/* UINT8 */ 	DMU_OT_ZVOL_PROP,		/* ZAP */ 	/* other; for testing only! */ 	DMU_OT_PLAIN_OTHER,		/* UINT8 */ 	DMU_OT_UINT64_OTHER,		/* UINT64 */ 	DMU_OT_ZAP_OTHER,		/* ZAP */ 	/* new object types: */ 	DMU_OT_ERROR_LOG,		/* ZAP */ 	DMU_OT_SPA_HISTORY,		/* UINT8 */ 	DMU_OT_SPA_HISTORY_OFFSETS,	/* spa_his_phys_t */ 	DMU_OT_POOL_PROPS,		/* ZAP */ 	DMU_OT_DSL_PERMS,		/* ZAP */ 	DMU_OT_ACL,			/* ACL */ 	DMU_OT_SYSACL,			/* SYSACL */ 	DMU_OT_FUID,			/* FUID table (Packed NVLIST UINT8) */ 	DMU_OT_FUID_SIZE,		/* FUID table size UINT64 */ 	DMU_OT_NEXT_CLONES,		/* ZAP */ 	DMU_OT_SCAN_QUEUE,		/* ZAP */ 	DMU_OT_USERGROUP_USED,		/* ZAP */ 	DMU_OT_USERGROUP_QUOTA,		/* ZAP */ 	DMU_OT_USERREFS,		/* ZAP */ 	DMU_OT_DDT_ZAP,			/* ZAP */ 	DMU_OT_DDT_STATS,		/* ZAP */ 	DMU_OT_SA,			/* System attr */ 	DMU_OT_SA_MASTER_NODE,		/* ZAP */ 	DMU_OT_SA_ATTR_REGISTRATION,	/* ZAP */ 	DMU_OT_SA_ATTR_LAYOUTS,		/* ZAP */ 	DMU_OT_SCAN_XLATE,		/* ZAP */ 	DMU_OT_DEDUP,			/* fake dedup BP from ddt_bp_create() */ 	DMU_OT_DEADLIST,		/* ZAP */ 	DMU_OT_DEADLIST_HDR,		/* UINT64 */ 	DMU_OT_DSL_CLONES,		/* ZAP */ 	DMU_OT_BPOBJ_SUBOBJ,		/* UINT64 */ 	/* 	 * Do not allocate new object types here. Doing so makes the on-disk 	 * format incompatible with any other format that uses the same object 	 * type number. 	 * 	 * When creating an object which does not have one of the above types 	 * use the DMU_OTN_* type with the correct byteswap and metadata 	 * values. 	 * 	 * The DMU_OTN_* types do not have entries in the dmu_ot table, 	 * use the DMU_OT_IS_METDATA() and DMU_OT_BYTESWAP() macros instead 	 * of indexing into dmu_ot directly (this works for both DMU_OT_* types 	 * and DMU_OTN_* types). 	 */ 	DMU_OT_NUMTYPES,  	/* 	 * Names for valid types declared with DMU_OT(). 	 */ 	DMU_OTN_UINT8_DATA = DMU_OT(DMU_BSWAP_UINT8, B_FALSE), 	DMU_OTN_UINT8_METADATA = DMU_OT(DMU_BSWAP_UINT8, B_TRUE), 	DMU_OTN_UINT16_DATA = DMU_OT(DMU_BSWAP_UINT16, B_FALSE), 	DMU_OTN_UINT16_METADATA = DMU_OT(DMU_BSWAP_UINT16, B_TRUE), 	DMU_OTN_UINT32_DATA = DMU_OT(DMU_BSWAP_UINT32, B_FALSE), 	DMU_OTN_UINT32_METADATA = DMU_OT(DMU_BSWAP_UINT32, B_TRUE), 	DMU_OTN_UINT64_DATA = DMU_OT(DMU_BSWAP_UINT64, B_FALSE), 	DMU_OTN_UINT64_METADATA = DMU_OT(DMU_BSWAP_UINT64, B_TRUE), 	DMU_OTN_ZAP_DATA = DMU_OT(DMU_BSWAP_ZAP, B_FALSE), 	DMU_OTN_ZAP_METADATA = DMU_OT(DMU_BSWAP_ZAP, B_TRUE), } dmu_object_type_t; 

Перечисления zio_checksum и zio_compress представлены ниже.

enum zio_checksum { 	ZIO_CHECKSUM_INHERIT = 0, 	ZIO_CHECKSUM_ON, 	ZIO_CHECKSUM_OFF, 	ZIO_CHECKSUM_LABEL, 	ZIO_CHECKSUM_GANG_HEADER, 	ZIO_CHECKSUM_ZILOG, 	ZIO_CHECKSUM_FLETCHER_2, 	ZIO_CHECKSUM_FLETCHER_4, 	ZIO_CHECKSUM_SHA256, 	ZIO_CHECKSUM_ZILOG2, 	ZIO_CHECKSUM_FUNCTIONS }; 

enum zio_compress { 	ZIO_COMPRESS_INHERIT = 0, 	ZIO_COMPRESS_ON, 	ZIO_COMPRESS_OFF, 	ZIO_COMPRESS_LZJB, 	ZIO_COMPRESS_EMPTY, 	ZIO_COMPRESS_GZIP_1, 	ZIO_COMPRESS_GZIP_2, 	ZIO_COMPRESS_GZIP_3, 	ZIO_COMPRESS_GZIP_4, 	ZIO_COMPRESS_GZIP_5, 	ZIO_COMPRESS_GZIP_6, 	ZIO_COMPRESS_GZIP_7, 	ZIO_COMPRESS_GZIP_8, 	ZIO_COMPRESS_GZIP_9, 	ZIO_COMPRESS_ZLE, 	ZIO_COMPRESS_LZ4, 	ZIO_COMPRESS_FUNCTIONS }; 

Объект (dnode)

Исключая uberblock все остальные сущности (метаданные и пользовательские данные) представлены в виде объектов. В перечислении dmu_object_type перечислены возможные типы объектов.

Объект описывается структурой dnode_phys, представленой ниже:

typedef struct dnode_phys { 	uint8_t dn_type;		/* dmu_object_type_t */ 	uint8_t dn_indblkshift;		/* ln2(indirect block size) */ 	uint8_t dn_nlevels;		/* 1=dn_blkptr->data blocks */ 	uint8_t dn_nblkptr;		/* length of dn_blkptr */ 	uint8_t dn_bonustype;		/* type of data in bonus buffer */ 	uint8_t	dn_checksum;		/* ZIO_CHECKSUM type */ 	uint8_t	dn_compress;		/* ZIO_COMPRESS type */ 	uint8_t dn_flags;		/* DNODE_FLAG_* */ 	uint16_t dn_datablkszsec;	/* data block size in 512b sectors */ 	uint16_t dn_bonuslen;		/* length of dn_bonus */ 	uint8_t dn_pad2[4]; 	/* accounting is protected by dn_dirty_mtx */ 	uint64_t dn_maxblkid;		/* largest allocated block ID */ 	uint64_t dn_used;		/* bytes (or sectors) of disk space */ 	uint64_t dn_pad3[4]; 	union { 		blkptr_t dn_blkptr[1+DN_MAX_BONUSLEN/sizeof (blkptr_t)]; 		struct { 			blkptr_t __dn_ignore1; 			uint8_t dn_bonus[DN_MAX_BONUSLEN]; 		}; 		struct { 			blkptr_t __dn_ignore2; 			uint8_t __dn_ignore3[DN_MAX_BONUSLEN-sizeof (blkptr_t)]; 			blkptr_t dn_spill; 		}; 	}; } dnode_phys_t; typedef struct zil_header { 	uint64_t zh_claim_txg;	/* txg in which log blocks were claimed */ 	uint64_t zh_replay_seq;	/* highest replayed sequence number */ 	blkptr_t zh_log;	/* log chain */ 	uint64_t zh_claim_blk_seq; /* highest claimed block sequence number */ 	uint64_t zh_flags;	/* header flags */ 	uint64_t zh_claim_lr_seq; /* highest claimed lr sequence number */ 	uint64_t zh_pad[3]; } zil_header_t;  

Набор объектов

Объекты zfs могут группироваться в так называемые наборы объектов (objset), и представлены следующими типами:

typedef enum dmu_objset_type { 	DMU_OST_NONE, 	DMU_OST_META,			/* MOS */ 	DMU_OST_ZFS,			/* Dataset 	DMU_OST_ZVOL,			/* Блочное устройство zfs (vol) 	DMU_OST_OTHER,			/* For testing only! */ 	DMU_OST_ANY,			/* Be careful! */ 	DMU_OST_NUMTYPES } dmu_objset_type_t; 

Сам набор объектов представлен такой 2-х килобайтной структурой:

typedef struct objset_phys { 	dnode_phys_t os_meta_dnode; 	zil_header_t os_zil_header; 	uint64_t os_type; 	uint64_t os_flags; 	char os_pad[OBJSET_PHYS_SIZE - sizeof (dnode_phys_t)*3 - 	    sizeof (zil_header_t) - sizeof (uint64_t)*2]; 	dnode_phys_t os_userused_dnode; 	dnode_phys_t os_groupused_dnode; } objset_phys_t; 

Смотрим на байты

В этой статье мы будем использовать тестовый пул основанный на 101-мегабайтном файле.
Почуму именно 101 Мб? Дело в том что zfs разбивает свободное пространнство (за минусом 4х 256Кб меток и 3.5 мегабайтного boot-блока) на фиксированные блоки (смотри Как работает ZFS — часть 1: vdev). Для 100Мб диска размер блока равняется 16Мб и для 100Мб диска таких блоков поместится только 5 и доступный объем будет равен 80Мб. А вот для 101Мб таких блоков уже вмещается 6 и доступный объем увеличивается до 96Мб. Хотя для данной статьи это не так уж и важно. Но например для 4Тб диска если его полностью отдать zfs то получим «потерянное» пространство размером более 13Гб.

3725 «двоичных» Гб делятся на блоки размером 16Гб каждый и остаток в 13Гб не используется.

Создаем тестовый пул

# dd if=/dev/zero of=/tmp/test_disk bs=1M count=101
101+0 записей получено
101+0 записей отправлено
105906176 байт (106 MB, 101 MiB) скопирован, 0,0847695 s, 1,2 GB/s

#zpool create test -o ashift=9 /tmp/test_disk

Зададим recordsize равным 512 байтам и добавим пару файлов.

# zfs set recordsize=512 test

# dd if=/dev/urandom of=/test/0B bs=1 count=0
0+0 записей получено
0+0 записей отправлено
0 байт скопировано, 0,000171206 s, 0,0 kB/s
# dd if=/dev/urandom of=/test/512B bs=512 count=1
1+0 записей получено
1+0 записей отправлено
512 байт скопировано, 0,000215428 s, 2,4 MB/s
# dd if=/dev/urandom of=/test/513B bs=513 count=1
1+0 записей получено
1+0 записей отправлено
513 байт скопировано, 0,00022484 s, 2,3 MB/s

Посмотрим сколько места файлы занимают на диске

# du -a --block-size=1
1024 ./512B
512 ./0B
2560 ./513B

Из интересного бросается в глаза то что файл нулевого размера занимает 512 байт (сравните с ext3 где он имеет размер ноль байтов). Файл размером 513 байт занимает не 1536 байт а целых 2560 байт, хотя казалось бы должен был бы занять место равное удвоенному размеру recordsize плюс служебная информация. Давайте разбирать почему так происходит.

Находим активный uberblock

Для доступа к сырым данным будем использовать утилиту radare2.
Сортируем по номеру транзакции.

# r2 /tmp/test_disk
[0x00000000]> pf q @@s:0x20010 0x40000 0x400|sort -k2
0x00020010 = (qword)0x0000000000000000

0x00028010 = (qword)0x0000000000000020
0x00028810 = (qword)0x0000000000000022
0x00028c10 = (qword)0x0000000000000023
0x0002e010 = (qword)0x0000000000000038

Активный uberblock находится по адресу 0x0002e000 (от найденого смещения 0x0002e010 отнимаем 16 байт).

Считываем uberblock полностью
[0x0003fc10]> 0x0002e000
[0x0002e000]> pf qqqqt:[128].q ub_magic ub_version ub_txg ub_guid_sum ub_timestamp ub_software_version
ub_magic : 0x0002e000 = (qword)0x0000000000bab10c
ub_version : 0x0002e008 = (qword)0x0000000000001388
ub_txg : 0x0002e010 = (qword)0x0000000000000038
ub_guid_sum : 0x0002e018 = (qword)0x667c11fc34e97151
ub_timestamp : 0x0002e020 = Wed Jan 31 07:29:56 2018
ub_software_version : 0x0002e0a8 = (qword)0x0000000000001388

Получаем ub_rootbp
[0x0002e000]> s+0x28
[0x0002e028]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x0002e028 = (qword)[ 0x0000000000000001, 0x00000000000000ab ]
blk_dva_1 : 0x0002e038 = (qword)[ 0x0000000000000001, 0x00000000000000bc ]
blk_dva_2 : 0x0002e048 = (qword)[ 0x0000000000000001, 0x00000000000000bd ]
blk_prop : 0x0002e058 = (qword)0x800b070f00000003
blk_pad[2] : 0x0002e060 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x0002e070 = (qword)0x0000000000000000
blk_birth : 0x0002e078 = (qword)0x0000000000000038
blk_fill : 0x0002e080 = (qword)0x0000000000000023
blk_cksum : 0x0002e088 = (qword)[ 0x0000000d43174e30, 0x00000513bae6359f, 0x0000ff222817dfe3, 0x00223eedae162ece ]

Для разбора параметров blkptr(blk_prop) использую MS Excell

image

Судя по значению comp (=15) блок сжат lz4 и занимает на диске 512 байт (PSIZE — показывает количество секторов) и после распаковки должен стать 2048 байт(LSIZE).

Сохраним блок в файл
Вычислим смещение от начала диска. Для этого значение поля blk_dva[0].dva_word[1](=0x00000000000000ab) из структуры blkptr умножим на 512(размер сектора) и добавим 0x400000(4Мб — метки L0, L1 и boot-блок). Результат поделим на 512 (работаем блоками по 512 байт).

[0x0002e028]> ?v 0x00000000000000ab<9+0x400000
0x415600
[0x0002e028]> ? 0x415600/512
8363 0x20ab 020253 8.2K 0000:00ab 8363 "\xab " 0b0010000010101011 8363.0 8363.000000f 8363.000000 0t102110202

# dd if=/tmp/test_disk bs=512 skip=8363 count=1 of=/tmp/mos.objset.bin.lz4

Для распаковки используем небольшую программку (исходник в конце статьи).

# zdec mos.objset.bin.lz4 mos.objset.bin 2048
Input: mos.objset.bin.lz4
Output: mos.objset.bin
Out size: 2048
-----------------------------
Input size: 512
Real input size: 187
Decompress result: 0

Посмотрим что хранится в MOS объекте

# r2 mos.objset.bin
[0x00000000]> pf [512].[192].qq[304].[512].[512]. os_type os_flags
os_type : 0x000002c0 = (qword)0x0000000000000001
os_flags : 0x000002c8 = (qword)0x0000000000000000
[0x00000000]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000000 = 0x0a
dn_indblkshift : 0x00000001 = 0x0e
dn_nlevels : 0x00000002 = 0x01
dn_nblkptr : 0x00000003 = 0x03
dn_bonustype : 0x00000004 = 0x00
dn_checksum : 0x00000005 = 0x00
dn_compress : 0x00000006 = 0x00
dn_flags : 0x00000007 = 0x01
dn_datablkszsec : 0x00000008 = 0x0020
dn_bonuslen : 0x0000000a = 0x0000
dn_pad2[4] : 0x0000000c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000010 = (qword)0x0000000000000001
dn_used : 0x00000018 = (qword)0x0000000000001e00
dn_pad3[4] : 0x00000020 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]

Считываем массив blkptr (начало массива со смещением +0x40). Размер структуры blkptr 128 байт (смещение +0x80)

[0x00000000]> s+0x40
[0x00000040]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00000040 = (qword)[ 0x0000000000000004, 0x00000000000000fd ]
blk_dva_1 : 0x00000050 = (qword)[ 0x0000000000000004, 0x0000000000000014 ]
blk_dva_2 : 0x00000060 = (qword)[ 0x0000000000000004, 0x0000000000000018 ]
blk_prop : 0x00000070 = (qword)0x800a070f0003001f
blk_pad[2] : 0x00000078 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00000088 = (qword)0x0000000000000000
blk_birth : 0x00000090 = (qword)0x0000000000000038
blk_fill : 0x00000098 = (qword)0x000000000000001f
blk_cksum : 0x000000a0 = (qword)[ 0x0000005b728c5143, 0x00006add456a9057, 0x0046f84e9ebc9fc1, 0x227baf4ccb8d8253 ]
[0x00000040]> s+0x80
[0x000000c0]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x000000c0 = (qword)[ 0x0000000000000001, 0x00000000000000c7 ]
blk_dva_1 : 0x000000d0 = (qword)[ 0x0000000000000001, 0x00000000000000c8 ]
blk_dva_2 : 0x000000e0 = (qword)[ 0x0000000000000001, 0x00000000000000f9 ]
blk_prop : 0x000000f0 = (qword)0x800a070f0000001f
blk_pad[2] : 0x000000f8 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00000108 = (qword)0x0000000000000000
blk_birth : 0x00000110 = (qword)0x0000000000000038
blk_fill : 0x00000118 = (qword)0x0000000000000004
blk_cksum : 0x00000120 = (qword)[ 0x000000212e3f6320, 0x000007421d158d58, 0x00012cb9dd4a54c3, 0x0026ea30b4caddc5 ]
[0x000000c0]> s+0x80
[0x00000140]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00000140 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_dva_1 : 0x00000150 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_dva_2 : 0x00000160 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_prop : 0x00000170 = (qword)0x0000000000000000
blk_pad[2] : 0x00000178 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00000188 = (qword)0x0000000000000000
blk_birth : 0x00000190 = (qword)0x0000000000000000
blk_fill : 0x00000198 = (qword)0x0000000000000000
blk_cksum : 0x000001a0 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]

image

Блоки сжаты алгоритмом lz4 и имеют размер 2048 байт и 512 байт соответственно (и реальный размер 16384 байт).

Сохраним в файл и распакуем
# dd if=/tmp/test_disk bs=512 skip=8445 count=4 of=/tmp/dsl.dnode.0.bin.lz4
# dd if=/tmp/test_disk bs=512 skip=8391 count=1 of=/tmp/dsl.dnode.1.bin.lz4
# zdec dsl.dnode.0.bin.lz4 dsl.dnode.0.bin 16384
Input: dsl.dnode.0.bin.lz4
Output: dsl.dnode.0.bin
Out size: 16384
-----------------------------
Input size: 2048
Real input size: 1589
Decompress result: 0
# zdec dsl.dnode.1.bin.lz4 dsl.dnode.1.bin 16384
Input: dsl.dnode.1.bin.lz4
Output: dsl.dnode.1.bin
Out size: 16384
-----------------------------
Input size: 512
Real input size: 464
Decompress result: 0

Составим список из объектов

31 объект

# r2 dsl.dnode.0.bin
[0x00000000]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000000 = 0x00
dn_indblkshift : 0x00000001 = 0x00
dn_nlevels : 0x00000002 = 0x00
dn_nblkptr : 0x00000003 = 0x00
dn_bonustype : 0x00000004 = 0x00
dn_checksum : 0x00000005 = 0x00
dn_compress : 0x00000006 = 0x00
dn_flags : 0x00000007 = 0x00
dn_datablkszsec : 0x00000008 = 0x0000
dn_bonuslen : 0x0000000a = 0x0000
dn_pad2[4] : 0x0000000c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000010 = (qword)0x0000000000000000
dn_used : 0x00000018 = (qword)0x0000000000000000
dn_pad3[4] : 0x00000020 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000000]> s+0x200
[0x00000200]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000200 = 0x01
dn_indblkshift : 0x00000201 = 0x0e
dn_nlevels : 0x00000202 = 0x01
dn_nblkptr : 0x00000203 = 0x03
dn_bonustype : 0x00000204 = 0x00
dn_checksum : 0x00000205 = 0x00
dn_compress : 0x00000206 = 0x00
dn_flags : 0x00000207 = 0x01
dn_datablkszsec : 0x00000208 = 0x0002
dn_bonuslen : 0x0000020a = 0x0000
dn_pad2[4] : 0x0000020c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000210 = (qword)0x0000000000000000
dn_used : 0x00000218 = (qword)0x0000000000000600
dn_pad3[4] : 0x00000220 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000200]> s+0x200
[0x00000400]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000400 = 0x0c
dn_indblkshift : 0x00000401 = 0x0e
dn_nlevels : 0x00000402 = 0x01
dn_nblkptr : 0x00000403 = 0x01
dn_bonustype : 0x00000404 = 0x0c
dn_checksum : 0x00000405 = 0x00
dn_compress : 0x00000406 = 0x00
dn_flags : 0x00000407 = 0x00
dn_datablkszsec : 0x00000408 = 0x0001
dn_bonuslen : 0x0000040a = 0x0100
dn_pad2[4] : 0x0000040c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000410 = (qword)0x0000000000000000
dn_used : 0x00000418 = (qword)0x0000000000000000
dn_pad3[4] : 0x00000420 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000400]> s+0x200
[0x00000600]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000600 = 0x0f
dn_indblkshift : 0x00000601 = 0x0e
dn_nlevels : 0x00000602 = 0x01
dn_nblkptr : 0x00000603 = 0x03
dn_bonustype : 0x00000604 = 0x00
dn_checksum : 0x00000605 = 0x00
dn_compress : 0x00000606 = 0x00
dn_flags : 0x00000607 = 0x01
dn_datablkszsec : 0x00000608 = 0x0001
dn_bonuslen : 0x0000060a = 0x0000
dn_pad2[4] : 0x0000060c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000610 = (qword)0x0000000000000000
dn_used : 0x00000618 = (qword)0x0000000000000000
dn_pad3[4] : 0x00000620 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000600]> s+0x200
[0x00000800]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000800 = 0x0d
dn_indblkshift : 0x00000801 = 0x0e
dn_nlevels : 0x00000802 = 0x01
dn_nblkptr : 0x00000803 = 0x03
dn_bonustype : 0x00000804 = 0x00
dn_checksum : 0x00000805 = 0x00
dn_compress : 0x00000806 = 0x00
dn_flags : 0x00000807 = 0x01
dn_datablkszsec : 0x00000808 = 0x0001
dn_bonuslen : 0x0000080a = 0x0000
dn_pad2[4] : 0x0000080c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000810 = (qword)0x0000000000000000
dn_used : 0x00000818 = (qword)0x0000000000000000
dn_pad3[4] : 0x00000820 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000800]> s+0x200
[0x00000a00]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000a00 = 0x0c
dn_indblkshift : 0x00000a01 = 0x0e
dn_nlevels : 0x00000a02 = 0x01
dn_nblkptr : 0x00000a03 = 0x01
dn_bonustype : 0x00000a04 = 0x0c
dn_checksum : 0x00000a05 = 0x00
dn_compress : 0x00000a06 = 0x00
dn_flags : 0x00000a07 = 0x00
dn_datablkszsec : 0x00000a08 = 0x0001
dn_bonuslen : 0x00000a0a = 0x0100
dn_pad2[4] : 0x00000a0c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000a10 = (qword)0x0000000000000000
dn_used : 0x00000a18 = (qword)0x0000000000000000
dn_pad3[4] : 0x00000a20 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000a00]> s+0x200
[0x00000c00]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000c00 = 0x0f
dn_indblkshift : 0x00000c01 = 0x0e
dn_nlevels : 0x00000c02 = 0x01
dn_nblkptr : 0x00000c03 = 0x03
dn_bonustype : 0x00000c04 = 0x00
dn_checksum : 0x00000c05 = 0x00
dn_compress : 0x00000c06 = 0x00
dn_flags : 0x00000c07 = 0x01
dn_datablkszsec : 0x00000c08 = 0x0001
dn_bonuslen : 0x00000c0a = 0x0000
dn_pad2[4] : 0x00000c0c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000c10 = (qword)0x0000000000000000
dn_used : 0x00000c18 = (qword)0x0000000000000000
dn_pad3[4] : 0x00000c20 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000c00]> s+0x200
[0x00000e00]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000e00 = 0x0d
dn_indblkshift : 0x00000e01 = 0x0e
dn_nlevels : 0x00000e02 = 0x01
dn_nblkptr : 0x00000e03 = 0x03
dn_bonustype : 0x00000e04 = 0x00
dn_checksum : 0x00000e05 = 0x00
dn_compress : 0x00000e06 = 0x00
dn_flags : 0x00000e07 = 0x01
dn_datablkszsec : 0x00000e08 = 0x0001
dn_bonuslen : 0x00000e0a = 0x0000
dn_pad2[4] : 0x00000e0c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000e10 = (qword)0x0000000000000000
dn_used : 0x00000e18 = (qword)0x0000000000000000
dn_pad3[4] : 0x00000e20 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000e00]> s+0x200
[0x00001000]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00001000 = 0x0c
dn_indblkshift : 0x00001001 = 0x0e
dn_nlevels : 0x00001002 = 0x01
dn_nblkptr : 0x00001003 = 0x01
dn_bonustype : 0x00001004 = 0x0c
dn_checksum : 0x00001005 = 0x00
dn_compress : 0x00001006 = 0x00
dn_flags : 0x00001007 = 0x00
dn_datablkszsec : 0x00001008 = 0x0001
dn_bonuslen : 0x0000100a = 0x0100
dn_pad2[4] : 0x0000100c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00001010 = (qword)0x0000000000000000
dn_used : 0x00001018 = (qword)0x0000000000000000
dn_pad3[4] : 0x00001020 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00001000]> s+0x200
[0x00001200]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00001200 = 0x0f
dn_indblkshift : 0x00001201 = 0x0e
dn_nlevels : 0x00001202 = 0x01
dn_nblkptr : 0x00001203 = 0x03
dn_bonustype : 0x00001204 = 0x00
dn_checksum : 0x00001205 = 0x00
dn_compress : 0x00001206 = 0x00
dn_flags : 0x00001207 = 0x01
dn_datablkszsec : 0x00001208 = 0x0001
dn_bonuslen : 0x0000120a = 0x0000
dn_pad2[4] : 0x0000120c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00001210 = (qword)0x0000000000000000
dn_used : 0x00001218 = (qword)0x0000000000000000
dn_pad3[4] : 0x00001220 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00001200]> s+0x200
[0x00001400]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00001400 = 0x0d
dn_indblkshift : 0x00001401 = 0x0e
dn_nlevels : 0x00001402 = 0x01
dn_nblkptr : 0x00001403 = 0x03
dn_bonustype : 0x00001404 = 0x00
dn_checksum : 0x00001405 = 0x00
dn_compress : 0x00001406 = 0x00
dn_flags : 0x00001407 = 0x01
dn_datablkszsec : 0x00001408 = 0x0001
dn_bonuslen : 0x0000140a = 0x0000
dn_pad2[4] : 0x0000140c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00001410 = (qword)0x0000000000000000
dn_used : 0x00001418 = (qword)0x0000000000000000
dn_pad3[4] : 0x00001420 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00001400]> s+0x200
[0x00001600]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00001600 = 0x05
dn_indblkshift : 0x00001601 = 0x0e
dn_nlevels : 0x00001602 = 0x01
dn_nblkptr : 0x00001603 = 0x03
dn_bonustype : 0x00001604 = 0x06
dn_checksum : 0x00001605 = 0x00
dn_compress : 0x00001606 = 0x00
dn_flags : 0x00001607 = 0x00
dn_datablkszsec : 0x00001608 = 0x0100
dn_bonuslen : 0x0000160a = 0x0030
dn_pad2[4] : 0x0000160c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00001610 = (qword)0x0000000000000000
dn_used : 0x00001618 = (qword)0x0000000000000000
dn_pad3[4] : 0x00001620 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00001600]> s+0x200
[0x00001800]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00001800 = 0x0c
dn_indblkshift : 0x00001801 = 0x0e
dn_nlevels : 0x00001802 = 0x01
dn_nblkptr : 0x00001803 = 0x01
dn_bonustype : 0x00001804 = 0x0c
dn_checksum : 0x00001805 = 0x00
dn_compress : 0x00001806 = 0x00
dn_flags : 0x00001807 = 0x00
dn_datablkszsec : 0x00001808 = 0x0001
dn_bonuslen : 0x0000180a = 0x0100
dn_pad2[4] : 0x0000180c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00001810 = (qword)0x0000000000000000
dn_used : 0x00001818 = (qword)0x0000000000000000
dn_pad3[4] : 0x00001820 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00001800]> s+0x200
[0x00001a00]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00001a00 = 0x0f
dn_indblkshift : 0x00001a01 = 0x0e
dn_nlevels : 0x00001a02 = 0x01
dn_nblkptr : 0x00001a03 = 0x03
dn_bonustype : 0x00001a04 = 0x00
dn_checksum : 0x00001a05 = 0x00
dn_compress : 0x00001a06 = 0x00
dn_flags : 0x00001a07 = 0x01
dn_datablkszsec : 0x00001a08 = 0x0001
dn_bonuslen : 0x00001a0a = 0x0000
dn_pad2[4] : 0x00001a0c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00001a10 = (qword)0x0000000000000000
dn_used : 0x00001a18 = (qword)0x0000000000000000
dn_pad3[4] : 0x00001a20 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00001a00]> s+0x200
[0x00001c00]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00001c00 = 0x0d
dn_indblkshift : 0x00001c01 = 0x0e
dn_nlevels : 0x00001c02 = 0x01
dn_nblkptr : 0x00001c03 = 0x03
dn_bonustype : 0x00001c04 = 0x00
dn_checksum : 0x00001c05 = 0x00
dn_compress : 0x00001c06 = 0x00
dn_flags : 0x00001c07 = 0x01
dn_datablkszsec : 0x00001c08 = 0x0001
dn_bonuslen : 0x00001c0a = 0x0000
dn_pad2[4] : 0x00001c0c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00001c10 = (qword)0x0000000000000000
dn_used : 0x00001c18 = (qword)0x0000000000000000
dn_pad3[4] : 0x00001c20 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00001c00]> s+0x200
[0x00001e00]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00001e00 = 0x10
dn_indblkshift : 0x00001e01 = 0x0e
dn_nlevels : 0x00001e02 = 0x01
dn_nblkptr : 0x00001e03 = 0x01
dn_bonustype : 0x00001e04 = 0x10
dn_checksum : 0x00001e05 = 0x00
dn_compress : 0x00001e06 = 0x00
dn_flags : 0x00001e07 = 0x00
dn_datablkszsec : 0x00001e08 = 0x0001
dn_bonuslen : 0x00001e0a = 0x0140
dn_pad2[4] : 0x00001e0c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00001e10 = (qword)0x0000000000000000
dn_used : 0x00001e18 = (qword)0x0000000000000000
dn_pad3[4] : 0x00001e20 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00001e00]> s+0x200
[0x00002000]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00002000 = 0x0e
dn_indblkshift : 0x00002001 = 0x0e
dn_nlevels : 0x00002002 = 0x01
dn_nblkptr : 0x00002003 = 0x03
dn_bonustype : 0x00002004 = 0x00
dn_checksum : 0x00002005 = 0x00
dn_compress : 0x00002006 = 0x00
dn_flags : 0x00002007 = 0x01
dn_datablkszsec : 0x00002008 = 0x0001
dn_bonuslen : 0x0000200a = 0x0000
dn_pad2[4] : 0x0000200c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00002010 = (qword)0x0000000000000000
dn_used : 0x00002018 = (qword)0x0000000000000000
dn_pad3[4] : 0x00002020 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00002000]> s+0x200
[0x00002200]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00002200 = 0x32
dn_indblkshift : 0x00002201 = 0x0e
dn_nlevels : 0x00002202 = 0x01
dn_nblkptr : 0x00002203 = 0x01
dn_bonustype : 0x00002204 = 0x33
dn_checksum : 0x00002205 = 0x00
dn_compress : 0x00002206 = 0x00
dn_flags : 0x00002207 = 0x01
dn_datablkszsec : 0x00002208 = 0x0001
dn_bonuslen : 0x0000220a = 0x0140
dn_pad2[4] : 0x0000220c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00002210 = (qword)0x0000000000000000
dn_used : 0x00002218 = (qword)0x0000000000000000
dn_pad3[4] : 0x00002220 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00002200]> s+0x200
[0x00002400]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00002400 = 0x10
dn_indblkshift : 0x00002401 = 0x0e
dn_nlevels : 0x00002402 = 0x01
dn_nblkptr : 0x00002403 = 0x01
dn_bonustype : 0x00002404 = 0x10
dn_checksum : 0x00002405 = 0x00
dn_compress : 0x00002406 = 0x00
dn_flags : 0x00002407 = 0x00
dn_datablkszsec : 0x00002408 = 0x0001
dn_bonuslen : 0x0000240a = 0x0140
dn_pad2[4] : 0x0000240c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00002410 = (qword)0x0000000000000000
dn_used : 0x00002418 = (qword)0x0000000000000000
dn_pad3[4] : 0x00002420 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00002400]> s+0x200
[0x00002600]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00002600 = 0x32
dn_indblkshift : 0x00002601 = 0x0e
dn_nlevels : 0x00002602 = 0x01
dn_nblkptr : 0x00002603 = 0x01
dn_bonustype : 0x00002604 = 0x33
dn_checksum : 0x00002605 = 0x00
dn_compress : 0x00002606 = 0x00
dn_flags : 0x00002607 = 0x01
dn_datablkszsec : 0x00002608 = 0x0001
dn_bonuslen : 0x0000260a = 0x0140
dn_pad2[4] : 0x0000260c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00002610 = (qword)0x0000000000000000
dn_used : 0x00002618 = (qword)0x0000000000000000
dn_pad3[4] : 0x00002620 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00002600]> s+0x200
[0x00002800]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00002800 = 0x05
dn_indblkshift : 0x00002801 = 0x0e
dn_nlevels : 0x00002802 = 0x01
dn_nblkptr : 0x00002803 = 0x03
dn_bonustype : 0x00002804 = 0x06
dn_checksum : 0x00002805 = 0x00
dn_compress : 0x00002806 = 0x00
dn_flags : 0x00002807 = 0x00
dn_datablkszsec : 0x00002808 = 0x0100
dn_bonuslen : 0x0000280a = 0x0030
dn_pad2[4] : 0x0000280c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00002810 = (qword)0x0000000000000000
dn_used : 0x00002818 = (qword)0x0000000000000000
dn_pad3[4] : 0x00002820 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00002800]> s+0x200
[0x00002a00]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00002a00 = 0x10
dn_indblkshift : 0x00002a01 = 0x0e
dn_nlevels : 0x00002a02 = 0x01
dn_nblkptr : 0x00002a03 = 0x01
dn_bonustype : 0x00002a04 = 0x10
dn_checksum : 0x00002a05 = 0x00
dn_compress : 0x00002a06 = 0x00
dn_flags : 0x00002a07 = 0x00
dn_datablkszsec : 0x00002a08 = 0x0001
dn_bonuslen : 0x00002a0a = 0x0140
dn_pad2[4] : 0x00002a0c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00002a10 = (qword)0x0000000000000000
dn_used : 0x00002a18 = (qword)0x0000000000000000
dn_pad3[4] : 0x00002a20 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00002a00]> s+0x200
[0x00002c00]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00002c00 = 0x0e
dn_indblkshift : 0x00002c01 = 0x0e
dn_nlevels : 0x00002c02 = 0x01
dn_nblkptr : 0x00002c03 = 0x03
dn_bonustype : 0x00002c04 = 0x00
dn_checksum : 0x00002c05 = 0x00
dn_compress : 0x00002c06 = 0x00
dn_flags : 0x00002c07 = 0x01
dn_datablkszsec : 0x00002c08 = 0x0001
dn_bonuslen : 0x00002c0a = 0x0000
dn_pad2[4] : 0x00002c0c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00002c10 = (qword)0x0000000000000000
dn_used : 0x00002c18 = (qword)0x0000000000000000
dn_pad3[4] : 0x00002c20 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00002c00]> s+0x200
[0x00002e00]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00002e00 = 0x32
dn_indblkshift : 0x00002e01 = 0x0e
dn_nlevels : 0x00002e02 = 0x01
dn_nblkptr : 0x00002e03 = 0x01
dn_bonustype : 0x00002e04 = 0x33
dn_checksum : 0x00002e05 = 0x00
dn_compress : 0x00002e06 = 0x00
dn_flags : 0x00002e07 = 0x01
dn_datablkszsec : 0x00002e08 = 0x0001
dn_bonuslen : 0x00002e0a = 0x0140
dn_pad2[4] : 0x00002e0c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00002e10 = (qword)0x0000000000000000
dn_used : 0x00002e18 = (qword)0x0000000000000000
dn_pad3[4] : 0x00002e20 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00002e00]> s+0x200
[0x00003000]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00003000 = 0x05
dn_indblkshift : 0x00003001 = 0x0e
dn_nlevels : 0x00003002 = 0x01
dn_nblkptr : 0x00003003 = 0x03
dn_bonustype : 0x00003004 = 0x06
dn_checksum : 0x00003005 = 0x00
dn_compress : 0x00003006 = 0x00
dn_flags : 0x00003007 = 0x00
dn_datablkszsec : 0x00003008 = 0x0100
dn_bonuslen : 0x0000300a = 0x0030
dn_pad2[4] : 0x0000300c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00003010 = (qword)0x0000000000000000
dn_used : 0x00003018 = (qword)0x0000000000000000
dn_pad3[4] : 0x00003020 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00003000]> s+0x200
[0x00003200]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00003200 = 0x25
dn_indblkshift : 0x00003201 = 0x0e
dn_nlevels : 0x00003202 = 0x01
dn_nblkptr : 0x00003203 = 0x03
dn_bonustype : 0x00003204 = 0x00
dn_checksum : 0x00003205 = 0x00
dn_compress : 0x00003206 = 0x00
dn_flags : 0x00003207 = 0x01
dn_datablkszsec : 0x00003208 = 0x0001
dn_bonuslen : 0x0000320a = 0x0000
dn_pad2[4] : 0x0000320c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00003210 = (qword)0x0000000000000000
dn_used : 0x00003218 = (qword)0x0000000000000000
dn_pad3[4] : 0x00003220 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00003200]> s+0x200
[0x00003400]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00003400 = 0x34
dn_indblkshift : 0x00003401 = 0x0e
dn_nlevels : 0x00003402 = 0x01
dn_nblkptr : 0x00003403 = 0x03
dn_bonustype : 0x00003404 = 0x00
dn_checksum : 0x00003405 = 0x00
dn_compress : 0x00003406 = 0x00
dn_flags : 0x00003407 = 0x01
dn_datablkszsec : 0x00003408 = 0x0001
dn_bonuslen : 0x0000340a = 0x0000
dn_pad2[4] : 0x0000340c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00003410 = (qword)0x0000000000000000
dn_used : 0x00003418 = (qword)0x0000000000000000
dn_pad3[4] : 0x00003420 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00003400]> s+0x200
[0x00003600]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00003600 = 0x03
dn_indblkshift : 0x00003601 = 0x0e
dn_nlevels : 0x00003602 = 0x01
dn_nblkptr : 0x00003603 = 0x03
dn_bonustype : 0x00003604 = 0x04
dn_checksum : 0x00003605 = 0x00
dn_compress : 0x00003606 = 0x00
dn_flags : 0x00003607 = 0x01
dn_datablkszsec : 0x00003608 = 0x0020
dn_bonuslen : 0x0000360a = 0x0008
dn_pad2[4] : 0x0000360c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00003610 = (qword)0x0000000000000000
dn_used : 0x00003618 = (qword)0x0000000000000c00
dn_pad3[4] : 0x00003620 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00003600]> s+0x200
[0x00003800]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00003800 = 0xc4
dn_indblkshift : 0x00003801 = 0x0e
dn_nlevels : 0x00003802 = 0x01
dn_nblkptr : 0x00003803 = 0x03
dn_bonustype : 0x00003804 = 0x00
dn_checksum : 0x00003805 = 0x00
dn_compress : 0x00003806 = 0x00
dn_flags : 0x00003807 = 0x01
dn_datablkszsec : 0x00003808 = 0x0001
dn_bonuslen : 0x0000380a = 0x0000
dn_pad2[4] : 0x0000380c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00003810 = (qword)0x0000000000000000
dn_used : 0x00003818 = (qword)0x0000000000000600
dn_pad3[4] : 0x00003820 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00003800]> s+0x200
[0x00003a00]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00003a00 = 0xc4
dn_indblkshift : 0x00003a01 = 0x0e
dn_nlevels : 0x00003a02 = 0x01
dn_nblkptr : 0x00003a03 = 0x03
dn_bonustype : 0x00003a04 = 0x00
dn_checksum : 0x00003a05 = 0x00
dn_compress : 0x00003a06 = 0x00
dn_flags : 0x00003a07 = 0x01
dn_datablkszsec : 0x00003a08 = 0x0001
dn_bonuslen : 0x00003a0a = 0x0000
dn_pad2[4] : 0x00003a0c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00003a10 = (qword)0x0000000000000000
dn_used : 0x00003a18 = (qword)0x0000000000000600
dn_pad3[4] : 0x00003a20 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00003a00]> s+0x200
[0x00003c00]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00003c00 = 0xc4
dn_indblkshift : 0x00003c01 = 0x0e
dn_nlevels : 0x00003c02 = 0x01
dn_nblkptr : 0x00003c03 = 0x03
dn_bonustype : 0x00003c04 = 0x00
dn_checksum : 0x00003c05 = 0x00
dn_compress : 0x00003c06 = 0x00
dn_flags : 0x00003c07 = 0x01
dn_datablkszsec : 0x00003c08 = 0x0020
dn_bonuslen : 0x00003c0a = 0x0000
dn_pad2[4] : 0x00003c0c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00003c10 = (qword)0x0000000000000001
dn_used : 0x00003c18 = (qword)0x0000000000003600
dn_pad3[4] : 0x00003c20 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00003c00]> s+0x200
[0x00003e00]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00003e00 = 0x05
dn_indblkshift : 0x00003e01 = 0x0e
dn_nlevels : 0x00003e02 = 0x01
dn_nblkptr : 0x00003e03 = 0x03
dn_bonustype : 0x00003e04 = 0x06
dn_checksum : 0x00003e05 = 0x00
dn_compress : 0x00003e06 = 0x02
dn_flags : 0x00003e07 = 0x01
dn_datablkszsec : 0x00003e08 = 0x0020
dn_bonuslen : 0x00003e0a = 0x0030
dn_pad2[4] : 0x00003e0c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00003e10 = (qword)0x0000000000000000
dn_used : 0x00003e18 = (qword)0x0000000000000600
dn_pad3[4] : 0x00003e20 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]

4 объекта

# r2 dsl.dnode.1.bin
[0x00000000]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000000 = 0x1d
dn_indblkshift : 0x00000001 = 0x0e
dn_nlevels : 0x00000002 = 0x01
dn_nblkptr : 0x00000003 = 0x03
dn_bonustype : 0x00000004 = 0x1e
dn_checksum : 0x00000005 = 0x00
dn_compress : 0x00000006 = 0x00
dn_flags : 0x00000007 = 0x01
dn_datablkszsec : 0x00000008 = 0x0100
dn_bonuslen : 0x0000000a = 0x0028
dn_pad2[4] : 0x0000000c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000010 = (qword)0x0000000000000000
dn_used : 0x00000018 = (qword)0x0000000000001200
dn_pad3[4] : 0x00000020 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000000]> s+0x200
[0x00000200]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000200 = 0xc4
dn_indblkshift : 0x00000201 = 0x0e
dn_nlevels : 0x00000202 = 0x01
dn_nblkptr : 0x00000203 = 0x03
dn_bonustype : 0x00000204 = 0x00
dn_checksum : 0x00000205 = 0x00
dn_compress : 0x00000206 = 0x00
dn_flags : 0x00000207 = 0x01
dn_datablkszsec : 0x00000208 = 0x0001
dn_bonuslen : 0x0000020a = 0x0000
dn_pad2[4] : 0x0000020c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000210 = (qword)0x0000000000000000
dn_used : 0x00000218 = (qword)0x0000000000000600
dn_pad3[4] : 0x00000220 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000200]> s+0x200
[0x00000400]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000400 = 0x02
dn_indblkshift : 0x00000401 = 0x0e
dn_nlevels : 0x00000402 = 0x01
dn_nblkptr : 0x00000403 = 0x03
dn_bonustype : 0x00000404 = 0x00
dn_checksum : 0x00000405 = 0x00
dn_compress : 0x00000406 = 0x00
dn_flags : 0x00000407 = 0x01
dn_datablkszsec : 0x00000408 = 0x0001
dn_bonuslen : 0x0000040a = 0x0000
dn_pad2[4] : 0x0000040c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000410 = (qword)0x0000000000000000
dn_used : 0x00000418 = (qword)0x0000000000000000
dn_pad3[4] : 0x00000420 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000400]> s+0x200
[0x00000600]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000600 = 0x08
dn_indblkshift : 0x00000601 = 0x0e
dn_nlevels : 0x00000602 = 0x01
dn_nblkptr : 0x00000603 = 0x01
dn_bonustype : 0x00000604 = 0x07
dn_checksum : 0x00000605 = 0x00
dn_compress : 0x00000606 = 0x00
dn_flags : 0x00000607 = 0x01
dn_datablkszsec : 0x00000608 = 0x0008
dn_bonuslen : 0x0000060a = 0x0140
dn_pad2[4] : 0x0000060c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000610 = (qword)0x0000000000000000
dn_used : 0x00000618 = (qword)0x0000000000000c00
dn_pad3[4] : 0x00000620 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]

В данный момент нас интересуют объекты 15, 18, 21.

index dn_type dn_bonustype dn_bonuslen
15 0x10 DMU_OT_DSL_DATASET 0x10 DMU_OT_DSL_DATASET 0x0140
18 0x10 DMU_OT_DSL_DATASET 0x10 DMU_OT_DSL_DATASET 0x0140
21 0x10 DMU_OT_DSL_DATASET 0x10 DMU_OT_DSL_DATASET 0x0140

Для объектов типа DMU_OT_DSL_DATASET в бонус-буфере структуры dnode хранится структура dsl_dataset_phys.

typedef struct dsl_dataset_phys { 	uint64_t ds_dir_obj;		/* DMU_OT_DSL_DIR */ 	uint64_t ds_prev_snap_obj;	/* DMU_OT_DSL_DATASET */ 	uint64_t ds_prev_snap_txg; 	uint64_t ds_next_snap_obj;	/* DMU_OT_DSL_DATASET */ 	uint64_t ds_snapnames_zapobj;	/* DMU_OT_DSL_DS_SNAP_MAP 0 for snaps */ 	uint64_t ds_num_children;	/* clone/snap children; ==0 for head */ 	uint64_t ds_creation_time;	/* seconds since 1970 */ 	uint64_t ds_creation_txg; 	uint64_t ds_deadlist_obj;	/* DMU_OT_DEADLIST */ 	/* 	 * ds_referenced_bytes, ds_compressed_bytes, and ds_uncompressed_bytes 	 * include all blocks referenced by this dataset, including those 	 * shared with any other datasets. 	 */ 	uint64_t ds_referenced_bytes; 	uint64_t ds_compressed_bytes; 	uint64_t ds_uncompressed_bytes; 	uint64_t ds_unique_bytes;	/* only relevant to snapshots */ 	/* 	 * The ds_fsid_guid is a 56-bit ID that can change to avoid 	 * collisions.  The ds_guid is a 64-bit ID that will never 	 * change, so there is a small probability that it will collide. 	 */ 	uint64_t ds_fsid_guid; 	uint64_t ds_guid; 	uint64_t ds_flags;		/* DS_FLAG_* */ 	blkptr_t ds_bp; 	uint64_t ds_next_clones_obj;	/* DMU_OT_DSL_CLONES */ 	uint64_t ds_props_obj;		/* DMU_OT_DSL_PROPS for snaps */ 	uint64_t ds_userrefs_obj;	/* DMU_OT_USERREFS */ 	uint64_t ds_pad[5]; /* pad out to 320 bytes for good measure */ } dsl_dataset_phys_t; 

Считываем объект 15

# r2 dsl.dnode.0.bin
-- Change the size of the file with the 'r' (resize) command
[0x00000000]> 0x00001e00
[0x00001e00]> s+0x40
[0x00001e40]> s+0x80
[0x00001ec0]> pf qqqqqqt:qqqqqqqqqb[127].qqq[5]q ds_dir_obj ds_prev_snap_obj ds_prev_snap_txg ds_next_snap_obj ds_snapnames_zapobj ds_num_children ds_creation_time ds_creation_txg ds_deadlist_obj ds_referenced_bytes ds_compressed_bytes ds_uncompressed_bytes ds_unique_bytes ds_fsid_guid ds_guid ds_flags ds_bp ds_next_clones_obj ds_props_obj ds_userrefs_obj ds_pad[5]
ds_dir_obj : 0x00001ec0 = (qword)0x000000000000000c
ds_prev_snap_obj : 0x00001ec8 = (qword)0x0000000000000012
ds_prev_snap_txg : 0x00001ed0 = (qword)0x0000000000000001
ds_next_snap_obj : 0x00001ed8 = (qword)0x0000000000000000
ds_snapnames_zapobj : 0x00001ee0 = (qword)0x0000000000000010
ds_num_children : 0x00001ee8 = (qword)0x0000000000000000
ds_creation_time : 0x00001ef0 = Wed Jan 31 07:25:31 2018
ds_creation_txg : 0x00001ef8 = (qword)0x0000000000000001
ds_deadlist_obj : 0x00001f00 = (qword)0x0000000000000013
ds_referenced_bytes : 0x00001f08 = (qword)0x0000000000000000
ds_compressed_bytes : 0x00001f10 = (qword)0x0000000000000000
ds_uncompressed_bytes : 0x00001f18 = (qword)0x0000000000000000
ds_unique_bytes : 0x00001f20 = (qword)0x0000000000000000
ds_fsid_guid : 0x00001f28 = (qword)0x0072595fd26fec77
ds_guid : 0x00001f30 = (qword)0x3723b59bcad0d186
ds_flags : 0x00001f38 = (qword)0x0000000000000004
ds_bp : 0x00001f40 = 0x00
ds_next_clones_obj : 0x00001fc0 = (qword)0x0000000000000000
ds_props_obj : 0x00001fc8 = (qword)0x0000000000000000
ds_userrefs_obj : 0x00001fd0 = (qword)0x0000000000000000
ds_pad[5] : 0x00001fd8 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
0x00001f40
[0x00001f40]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00001f40 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_dva_1 : 0x00001f50 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_dva_2 : 0x00001f60 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_prop : 0x00001f70 = (qword)0x0000000000000000
blk_pad[2] : 0x00001f78 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00001f88 = (qword)0x0000000000000000
blk_birth : 0x00001f90 = (qword)0x0000000000000000
blk_fill : 0x00001f98 = (qword)0x0000000000000000
blk_cksum : 0x00001fa0 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]

Считываем объект 18

0x00002400
[0x00002400]> s+0x40
[0x00002440]> s+0x80
[0x000024c0]> pf qqqqqqt:qqqqqqqqqb[127].qqq[5]q ds_dir_obj ds_prev_snap_obj ds_prev_snap_txg ds_next_snap_obj ds_snapnames_zapobj ds_num_children ds_creation_time ds_creation_txg ds_deadlist_obj ds_referenced_bytes ds_compressed_bytes ds_uncompressed_bytes ds_unique_bytes ds_fsid_guid ds_guid ds_flags ds_bp ds_next_clones_obj ds_props_obj ds_userrefs_obj ds_pad[5]
ds_dir_obj : 0x000024c0 = (qword)0x000000000000000c
ds_prev_snap_obj : 0x000024c8 = (qword)0x0000000000000000
ds_prev_snap_txg : 0x000024d0 = (qword)0x0000000000000000
ds_next_snap_obj : 0x000024d8 = (qword)0x000000000000000f
ds_snapnames_zapobj : 0x000024e0 = (qword)0x0000000000000000
ds_num_children : 0x000024e8 = (qword)0x0000000000000002
ds_creation_time : 0x000024f0 = Wed Jan 31 07:25:31 2018
ds_creation_txg : 0x000024f8 = (qword)0x0000000000000001
ds_deadlist_obj : 0x00002500 = (qword)0x0000000000000011
ds_referenced_bytes : 0x00002508 = (qword)0x0000000000000000
ds_compressed_bytes : 0x00002510 = (qword)0x0000000000000000
ds_uncompressed_bytes : 0x00002518 = (qword)0x0000000000000000
ds_unique_bytes : 0x00002520 = (qword)0x0000000000000000
ds_fsid_guid : 0x00002528 = (qword)0x007551fa166ccbaf
ds_guid : 0x00002530 = (qword)0x107a852b04f9f01f
ds_flags : 0x00002538 = (qword)0x0000000000000004
ds_bp : 0x00002540 = 0x00
ds_next_clones_obj : 0x000025c0 = (qword)0x0000000000000019
ds_props_obj : 0x000025c8 = (qword)0x0000000000000000
ds_userrefs_obj : 0x000025d0 = (qword)0x0000000000000000
ds_pad[5] : 0x000025d8 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
0x00002540
[0x00002540]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00002540 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_dva_1 : 0x00002550 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_dva_2 : 0x00002560 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_prop : 0x00002570 = (qword)0x0000000000000000
blk_pad[2] : 0x00002578 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00002588 = (qword)0x0000000000000000
blk_birth : 0x00002590 = (qword)0x0000000000000000
blk_fill : 0x00002598 = (qword)0x0000000000000000
blk_cksum : 0x000025a0 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]

Считываем объект 21

0x00002a00
[0x00002a00]> s+0x40
[0x00002a40]> s+0x80
[0x00002ac0]> pf qqqqqqt:qqqqqqqqqb[127].qqq[5]q ds_dir_obj ds_prev_snap_obj ds_prev_snap_txg ds_next_snap_obj ds_snapnames_zapobj ds_num_children ds_creation_time ds_creation_txg ds_deadlist_obj ds_referenced_bytes ds_compressed_bytes ds_uncompressed_bytes ds_unique_bytes ds_fsid_guid ds_guid ds_flags ds_bp ds_next_clones_obj ds_props_obj ds_userrefs_obj ds_pad[5]
ds_dir_obj : 0x00002ac0 = (qword)0x0000000000000002
ds_prev_snap_obj : 0x00002ac8 = (qword)0x0000000000000012
ds_prev_snap_txg : 0x00002ad0 = (qword)0x0000000000000001
ds_next_snap_obj : 0x00002ad8 = (qword)0x0000000000000000
ds_snapnames_zapobj : 0x00002ae0 = (qword)0x0000000000000016
ds_num_children : 0x00002ae8 = (qword)0x0000000000000000
ds_creation_time : 0x00002af0 = Wed Jan 31 07:25:31 2018
ds_creation_txg : 0x00002af8 = (qword)0x0000000000000001
ds_deadlist_obj : 0x00002b00 = (qword)0x0000000000000017
ds_referenced_bytes : 0x00002b08 = (qword)0x0000000000005600
ds_compressed_bytes : 0x00002b10 = (qword)0x0000000000002e00
ds_uncompressed_bytes : 0x00002b18 = (qword)0x0000000000002e00
ds_unique_bytes : 0x00002b20 = (qword)0x0000000000005600
ds_fsid_guid : 0x00002b28 = (qword)0x00aca2eec566a5b9
ds_guid : 0x00002b30 = (qword)0x6994c8e8b2452f06
ds_flags : 0x00002b38 = (qword)0x0000000000000004
ds_bp : 0x00002b40 = 0x01
ds_next_clones_obj : 0x00002bc0 = (qword)0x0000000000000000
ds_props_obj : 0x00002bc8 = (qword)0x0000000000000000
ds_userrefs_obj : 0x00002bd0 = (qword)0x0000000000000000
ds_pad[5] : 0x00002bd8 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
0x00002b40
[0x00002b40]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00002b40 = (qword)[ 0x0000000000000001, 0x0000000000000057 ]
blk_dva_1 : 0x00002b50 = (qword)[ 0x0000000000000001, 0x0000000000000058 ]
blk_dva_2 : 0x00002b60 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_prop : 0x00002b70 = (qword)0x800b070f00000003
blk_pad[2] : 0x00002b78 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00002b88 = (qword)0x0000000000000000
blk_birth : 0x00002b90 = (qword)0x0000000000000038
blk_fill : 0x00002b98 = (qword)0x0000000000000009
blk_cksum : 0x00002ba0 = (qword)[ 0x0000000efd4a0466, 0x000005ded369f382, 0x00012e169b3aebd5, 0x00298598c4f3c9d9 ]

image
Только этот объект хранит данные, далее будем работать с ним.

Сохраним в файл и распакуем

# dd if=/tmp/test_disk bs=512 skip=8279 count=1 of=/tmp/os.dataset.bin.lz4
# zdec os.dataset.bin.lz4 os.dataset.bin 2048
Input: os.dataset.bin.lz4
Output: os.dataset.bin
Out size: 2048
-----------------------------
Input size: 512
Real input size: 201
Decompress result: 0

Смотрим содержимое objset

# r2 os.dataset.bin
[0x00000000]> pf [512].[192].qq[304].[512].[512]. os_type os_flags
os_type : 0x000002c0 = (qword)0x0000000000000002
os_flags : 0x000002c8 = (qword)0x0000000000000001
[0x00000000]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000000 = 0x0a
dn_indblkshift : 0x00000001 = 0x0e
dn_nlevels : 0x00000002 = 0x07
dn_nblkptr : 0x00000003 = 0x03
dn_bonustype : 0x00000004 = 0x00
dn_checksum : 0x00000005 = 0x00
dn_compress : 0x00000006 = 0x00
dn_flags : 0x00000007 = 0x01
dn_datablkszsec : 0x00000008 = 0x0020
dn_bonuslen : 0x0000000a = 0x0000
dn_pad2[4] : 0x0000000c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000010 = (qword)0x0000000000000000
dn_used : 0x00000018 = (qword)0x0000000000002000
dn_pad3[4] : 0x00000020 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000000]> s+0x40
[0x00000040]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00000040 = (qword)[ 0x0000000000000001, 0x000000000000010c ]
blk_dva_1 : 0x00000050 = (qword)[ 0x0000000000000001, 0x000000000000010d ]
blk_dva_2 : 0x00000060 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_prop : 0x00000070 = (qword)0x860a070f0000001f
blk_pad[2] : 0x00000078 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00000088 = (qword)0x0000000000000000
blk_birth : 0x00000090 = (qword)0x0000000000000038
blk_fill : 0x00000098 = (qword)0x0000000000000009
blk_cksum : 0x000000a0 = (qword)[ 0x0000001353eb3bd1, 0x000007c5fce654db, 0x000196a4bd5ee712, 0x00384d0db7501d91 ]

image

Это ссылка на косвенный блок 6 уровня, последовательно будем копать до нулевого уровня.

L6
# dd if=/tmp/test_disk bs=512 skip=8460 count=1 of=/tmp/os.dataset.dnode.l6.bin.lz4
# zdec os.dataset.dnode.l6.bin.lz4 os.dataset.dnode.l6.bin 16384
Input: os.dataset.dnode.l6.bin.lz4
Output: os.dataset.dnode.l6.bin
Out size: 16384
-----------------------------
Input size: 512
Real input size: 150
Decompress result: 0
# r2 os.dataset.dnode.l6.bin
[0x00000000]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00000000 = (qword)[ 0x0000000000000001, 0x00000000000000b6 ]
blk_dva_1 : 0x00000010 = (qword)[ 0x0000000000000001, 0x000000000000010b ]
blk_dva_2 : 0x00000020 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_prop : 0x00000030 = (qword)0x850a070f0000001f
blk_pad[2] : 0x00000038 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00000048 = (qword)0x0000000000000000
blk_birth : 0x00000050 = (qword)0x0000000000000038
blk_fill : 0x00000058 = (qword)0x0000000000000009
blk_cksum : 0x00000060 = (qword)[ 0x00000012eaa1fd11, 0x000007989478980e, 0x00018c88e386c191, 0x0036c2a7102bf2c2 ]

L5
[0x00000000]> "? 0x400000/512 + 0x00000000000000b6"
8374 0x20b6 020266 8.2K 0000:00b6 8374 "\xb6 " 0b0010000010110110 8374.0 8374.000000f 8374.000000 0t102111011
# dd if=/tmp/test_disk bs=512 skip=8374 count=1 of=/tmp/os.dataset.dnode.l5.bin.lz4
# zdec os.dataset.dnode.l5.bin.lz4 os.dataset.dnode.l5.bin 16384
Input: os.dataset.dnode.l5.bin.lz4
Output: os.dataset.dnode.l5.bin
Out size: 16384
-----------------------------
Input size: 512
Real input size: 149
Decompress result: 0
# r2 os.dataset.dnode.l5.bin
[0x00000000]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00000000 = (qword)[ 0x0000000000000001, 0x00000000000000b4 ]
blk_dva_1 : 0x00000010 = (qword)[ 0x0000000000000001, 0x00000000000000b5 ]
blk_dva_2 : 0x00000020 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_prop : 0x00000030 = (qword)0x840a070f0000001f
blk_pad[2] : 0x00000038 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00000048 = (qword)0x0000000000000000
blk_birth : 0x00000050 = (qword)0x0000000000000038
blk_fill : 0x00000058 = (qword)0x0000000000000009
blk_cksum : 0x00000060 = (qword)[ 0x000000135bd403fd, 0x000007c79b2ed6a0, 0x0001969b589bf00e, 0x00383d2f2da4c77e ]

L4
[0x00000000]> "? 0x400000/512 + 0x00000000000000b4"
8372 0x20b4 020264 8.2K 0000:00b4 8372 "\xb4 " 0b0010000010110100 8372.0 8372.000000f 8372.000000 0t102111002
# dd if=/tmp/test_disk bs=512 skip=8372 count=1 of=/tmp/os.dataset.dnode.l4.bin.lz4
# zdec os.dataset.dnode.l4.bin.lz4 os.dataset.dnode.l4.bin 16384
Input: os.dataset.dnode.l4.bin.lz4
Output: os.dataset.dnode.l4.bin
Out size: 16384
-----------------------------
Input size: 512
Real input size: 150
Decompress result: 0
# r2 os.dataset.dnode.l4.bin
-- Execute a command every time a breakpoint is hit with 'e cmd.bp = !my-program'
[0x00000000]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00000000 = (qword)[ 0x0000000000000001, 0x0000000000000081 ]
blk_dva_1 : 0x00000010 = (qword)[ 0x0000000000000001, 0x0000000000000082 ]
blk_dva_2 : 0x00000020 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_prop : 0x00000030 = (qword)0x830a070f0000001f
blk_pad[2] : 0x00000038 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00000048 = (qword)0x0000000000000000
blk_birth : 0x00000050 = (qword)0x0000000000000038
blk_fill : 0x00000058 = (qword)0x0000000000000009
blk_cksum : 0x00000060 = (qword)[ 0x00000012cee6bcc2, 0x0000078b79b1c147, 0x000189aa5ace3a0a, 0x00365db1d10dc06e ]

L3
[0x00000000]> "? 0x400000/512 + 0x0000000000000081"
8321 0x2081 020201 8.1K 0000:0081 8321 "\x81 " 0b0010000010000001 8321.0 8321.000000f 8321.000000 0t102102012
# dd if=/tmp/test_disk bs=512 skip=8321 count=1 of=/tmp/os.dataset.dnode.l3.bin.lz4
# zdec os.dataset.dnode.l3.bin.lz4 os.dataset.dnode.l3.bin 16384
Input: os.dataset.dnode.l3.bin.lz4
Output: os.dataset.dnode.l3.bin
Out size: 16384
-----------------------------
Input size: 512
Real input size: 150
Decompress result: 0
# r2 os.dataset.dnode.l3.bin
-- Use the '[' and ']' keys in visual mode to adjust the screen width
[0x00000000]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00000000 = (qword)[ 0x0000000000000001, 0x00000000000000ea ]
blk_dva_1 : 0x00000010 = (qword)[ 0x0000000000000001, 0x0000000000000080 ]
blk_dva_2 : 0x00000020 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_prop : 0x00000030 = (qword)0x820a070f0000001f
blk_pad[2] : 0x00000038 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00000048 = (qword)0x0000000000000000
blk_birth : 0x00000050 = (qword)0x0000000000000038
blk_fill : 0x00000058 = (qword)0x0000000000000009
blk_cksum : 0x00000060 = (qword)[ 0x00000013d660f06c, 0x000007fd7a9a913f, 0x0001a28c7591888d, 0x003a04c5208f66a6 ]

L2
[0x00000000]> "? 0x400000/512 + 0x00000000000000ea"
8426 0x20ea 020352 8.2K 0000:00ea 8426 "\xea " 0b0010000011101010 8426.0 8426.000000f 8426.000000 0t102120002
# dd if=/tmp/test_disk bs=512 skip=8426 count=1 of=/tmp/os.dataset.dnode.l2.bin.lz4
# zdec os.dataset.dnode.l2.bin.lz4 os.dataset.dnode.l2.bin 16384
Input: os.dataset.dnode.l2.bin.lz4
Output: os.dataset.dnode.l2.bin
Out size: 16384
-----------------------------
Input size: 512
Real input size: 150
Decompress result: 0
# r2 os.dataset.dnode.l2.bin
[0x00000000]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00000000 = (qword)[ 0x0000000000000001, 0x000000000000007e ]
blk_dva_1 : 0x00000010 = (qword)[ 0x0000000000000001, 0x00000000000000d8 ]
blk_dva_2 : 0x00000020 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_prop : 0x00000030 = (qword)0x810a070f0000001f
blk_pad[2] : 0x00000038 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00000048 = (qword)0x0000000000000000
blk_birth : 0x00000050 = (qword)0x0000000000000038
blk_fill : 0x00000058 = (qword)0x0000000000000009
blk_cksum : 0x00000060 = (qword)[ 0x000000119de2c7aa, 0x00000700d12632b0, 0x000169e2d81be607, 0x00317850a78e8a46 ]

L1
[0x00000000]> "? 0x400000/512 + 0x000000000000007e"
8318 0x207e 020176 8.1K 0000:007e 8318 "~ " 0b0010000001111110 8318.0 8318.000000f 8318.000000 0t102102002
# dd if=/tmp/test_disk bs=512 skip=8318 count=1 of=/tmp/os.dataset.dnode.l1.bin.lz4
# zdec os.dataset.dnode.l1.bin.lz4 os.dataset.dnode.l1.bin 16384
Input: os.dataset.dnode.l1.bin.lz4
Output: os.dataset.dnode.l1.bin
Out size: 16384
-----------------------------
Input size: 512
Real input size: 150
Decompress result: 0
# r2 os.dataset.dnode.l1.bin
[0x00000000]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00000000 = (qword)[ 0x0000000000000002, 0x0000000000000105 ]
blk_dva_1 : 0x00000010 = (qword)[ 0x0000000000000002, 0x000000000000007c ]
blk_dva_2 : 0x00000020 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_prop : 0x00000030 = (qword)0x800a070f0001001f
blk_pad[2] : 0x00000038 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00000048 = (qword)0x0000000000000000
blk_birth : 0x00000050 = (qword)0x0000000000000038
blk_fill : 0x00000058 = (qword)0x0000000000000009
blk_cksum : 0x00000060 = (qword)[ 0x0000003e07b9461b, 0x00001c6526d2728c, 0x00097c6c15624af0, 0x0268557731d83b04 ]

L0
[0x00000000]> "? 0x400000/512 + 0x0000000000000105"
8453 0x2105 020405 8.3K 0000:0105 8453 "\x05!" 0b0010000100000101 8453.0 8453.000000f 8453.000000 0t102121002
# dd if=/tmp/test_disk bs=512 skip=8453 count=2 of=/tmp/os.dataset.dnode.l0.bin.lz4
# zdec os.dataset.dnode.l0.bin.lz4 os.dataset.dnode.l0.bin 16384
Input: os.dataset.dnode.l0.bin.lz4
Output: os.dataset.dnode.l0.bin
Out size: 16384
-----------------------------
Input size: 1024
Real input size: 1007
Decompress result: 0

Нулевой уровень это непосредственно objset.

Составим список объектов

9 объектов

# r2 os.dataset.dnode.l0.bin
[0x00000000]> s+0x200
[0x00000200]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000200 = 0x15
dn_indblkshift : 0x00000201 = 0x0e
dn_nlevels : 0x00000202 = 0x01
dn_nblkptr : 0x00000203 = 0x03
dn_bonustype : 0x00000204 = 0x00
dn_checksum : 0x00000205 = 0x00
dn_compress : 0x00000206 = 0x00
dn_flags : 0x00000207 = 0x03
dn_datablkszsec : 0x00000208 = 0x0001
dn_bonuslen : 0x0000020a = 0x0000
dn_pad2[4] : 0x0000020c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000210 = (qword)0x0000000000000000
dn_used : 0x00000218 = (qword)0x0000000000000400
dn_pad3[4] : 0x00000220 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000200]> s+0x200
[0x00000400]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000400 = 0x2d
dn_indblkshift : 0x00000401 = 0x0e
dn_nlevels : 0x00000402 = 0x01
dn_nblkptr : 0x00000403 = 0x03
dn_bonustype : 0x00000404 = 0x00
dn_checksum : 0x00000405 = 0x00
dn_compress : 0x00000406 = 0x00
dn_flags : 0x00000407 = 0x03
dn_datablkszsec : 0x00000408 = 0x0001
dn_bonuslen : 0x0000040a = 0x0000
dn_pad2[4] : 0x0000040c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000410 = (qword)0x0000000000000000
dn_used : 0x00000418 = (qword)0x0000000000000000
dn_pad3[4] : 0x00000420 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000400]> s+0x200
[0x00000600]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000600 = 0x16
dn_indblkshift : 0x00000601 = 0x0e
dn_nlevels : 0x00000602 = 0x01
dn_nblkptr : 0x00000603 = 0x03
dn_bonustype : 0x00000604 = 0x00
dn_checksum : 0x00000605 = 0x00
dn_compress : 0x00000606 = 0x00
dn_flags : 0x00000607 = 0x03
dn_datablkszsec : 0x00000608 = 0x0001
dn_bonuslen : 0x0000060a = 0x0000
dn_pad2[4] : 0x0000060c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000610 = (qword)0x0000000000000000
dn_used : 0x00000618 = (qword)0x0000000000000000
dn_pad3[4] : 0x00000620 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000600]> s+0x200
[0x00000800]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000800 = 0x14
dn_indblkshift : 0x00000801 = 0x0e
dn_nlevels : 0x00000802 = 0x01
dn_nblkptr : 0x00000803 = 0x01
dn_bonustype : 0x00000804 = 0x2c
dn_checksum : 0x00000805 = 0x00
dn_compress : 0x00000806 = 0x00
dn_flags : 0x00000807 = 0x03
dn_datablkszsec : 0x00000808 = 0x0001
dn_bonuslen : 0x0000080a = 0x00a8
dn_pad2[4] : 0x0000080c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000810 = (qword)0x0000000000000000
dn_used : 0x00000818 = (qword)0x0000000000000000
dn_pad3[4] : 0x00000820 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000800]> s+0x200
[0x00000a00]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000a00 = 0x2e
dn_indblkshift : 0x00000a01 = 0x0e
dn_nlevels : 0x00000a02 = 0x01
dn_nblkptr : 0x00000a03 = 0x03
dn_bonustype : 0x00000a04 = 0x00
dn_checksum : 0x00000a05 = 0x00
dn_compress : 0x00000a06 = 0x00
dn_flags : 0x00000a07 = 0x03
dn_datablkszsec : 0x00000a08 = 0x0003
dn_bonuslen : 0x00000a0a = 0x0000
dn_pad2[4] : 0x00000a0c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000a10 = (qword)0x0000000000000000
dn_used : 0x00000a18 = (qword)0x0000000000000400
dn_pad3[4] : 0x00000a20 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000a00]> s+0x200
[0x00000c00]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000c00 = 0x2f
dn_indblkshift : 0x00000c01 = 0x0e
dn_nlevels : 0x00000c02 = 0x01
dn_nblkptr : 0x00000c03 = 0x03
dn_bonustype : 0x00000c04 = 0x00
dn_checksum : 0x00000c05 = 0x00
dn_compress : 0x00000c06 = 0x00
dn_flags : 0x00000c07 = 0x03
dn_datablkszsec : 0x00000c08 = 0x0020
dn_bonuslen : 0x00000c0a = 0x0000
dn_pad2[4] : 0x00000c0c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000c10 = (qword)0x0000000000000001
dn_used : 0x00000c18 = (qword)0x0000000000002000
dn_pad3[4] : 0x00000c20 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000c00]> s+0x200
[0x00000e00]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00000e00 = 0x13
dn_indblkshift : 0x00000e01 = 0x0e
dn_nlevels : 0x00000e02 = 0x01
dn_nblkptr : 0x00000e03 = 0x01
dn_bonustype : 0x00000e04 = 0x2c
dn_checksum : 0x00000e05 = 0x00
dn_compress : 0x00000e06 = 0x00
dn_flags : 0x00000e07 = 0x02
dn_datablkszsec : 0x00000e08 = 0x0001
dn_bonuslen : 0x00000e0a = 0x00a8
dn_pad2[4] : 0x00000e0c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00000e10 = (qword)0x0000000000000000
dn_used : 0x00000e18 = (qword)0x0000000000000000
dn_pad3[4] : 0x00000e20 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00000e00]> s+0x200
[0x00001000]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00001000 = 0x13
dn_indblkshift : 0x00001001 = 0x0e
dn_nlevels : 0x00001002 = 0x01
dn_nblkptr : 0x00001003 = 0x01
dn_bonustype : 0x00001004 = 0x2c
dn_checksum : 0x00001005 = 0x00
dn_compress : 0x00001006 = 0x00
dn_flags : 0x00001007 = 0x03
dn_datablkszsec : 0x00001008 = 0x0001
dn_bonuslen : 0x0000100a = 0x00a8
dn_pad2[4] : 0x0000100c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00001010 = (qword)0x0000000000000000
dn_used : 0x00001018 = (qword)0x0000000000000200
dn_pad3[4] : 0x00001020 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
[0x00001000]> s+0x200
[0x00001200]> pf bbbbbbbbww[4]bqq[4]q dn_type dn_indblkshift dn_nlevels dn_nblkptr dn_bonustype dn_checksum dn_compress dn_flags dn_datablkszsec dn_bonuslen dn_pad2[4] dn_maxblkid dn_used dn_pad3[4]
dn_type : 0x00001200 = 0x13
dn_indblkshift : 0x00001201 = 0x0e
dn_nlevels : 0x00001202 = 0x02
dn_nblkptr : 0x00001203 = 0x01
dn_bonustype : 0x00001204 = 0x2c
dn_checksum : 0x00001205 = 0x00
dn_compress : 0x00001206 = 0x00
dn_flags : 0x00001207 = 0x03
dn_datablkszsec : 0x00001208 = 0x0001
dn_bonuslen : 0x0000120a = 0x00a8
dn_pad2[4] : 0x0000120c = [ 0x00, 0x00, 0x00, 0x00 ]
dn_maxblkid : 0x00001210 = (qword)0x0000000000000001
dn_used : 0x00001218 = (qword)0x0000000000000800
dn_pad3[4] : 0x00001220 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]

index dn_type dn_bonustype dn_bonuslen
4 0x14 DMU_OT_DIRECTORY_CONTENTS 0x2c DMU_OT_SA 0x00a8
7 0x13 DMU_OT_PLAIN_FILE_CONTENTS 0x2c DMU_OT_SA 0x00a8
8 0x13 DMU_OT_PLAIN_FILE_CONTENTS 0x2c DMU_OT_SA 0x00a8
9 0x13 DMU_OT_PLAIN_FILE_CONTENTS 0x2c DMU_OT_SA 0x00a8

Объекты 7, 8, 9 это созданные нами файлы 0B, 512B, 513B. Соответствие номера и файла можно получить из объекта 4 (DMU_OT_DIRECTORY_CONTENTS).

Считаем объект 4
# r2 os.dataset.dnode.l0.bin
[0x00001400]> 0x00000800
[0x00000800]> s+0x40
[0x00000840]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00000840 = (qword)[ 0x0100032143000000, 0x0cfd073129805300 ]
blk_dva_1 : 0x00000850 = (qword)[ 0x2e07121a00020f00, 0x4230220007801200 ]
blk_dva_2 : 0x00000860 = (qword)[ 0x08121700020f0008, 0x31353f004003002b ]
blk_prop : 0x00000870 = (qword)0x8014008f8c0001ff
blk_pad[2] : 0x00000878 = (qword)[ 0x0040091b1c004232, 0x00020f1c0040331f ]
blk_phys_birth : 0x00000888 = (qword)0x00000000000050e8
blk_birth : 0x00000890 = (qword)0x0000000000000022
blk_fill : 0x00000898 = (qword)0x0000000000000000
blk_cksum : 0x000008a0 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]

Это Embedded blkptr(бит E), структура отличается от обычного blkptr.
image

Данные хранятся непосредственно в структуре.

[0x00000840]> pf [48]bq[24]bq[40]b data_1 blk_prob data_2 txg data_3
data_1 : 0x00000840 = [ 0x00, 0x00, 0x00, 0x43, 0x21, 0x03, 0x00, 0x01, 0x00, 0x53, 0x80, 0x29, 0x31, 0x07, 0xfd, 0x0c, 0x00, 0x0f, 0x02, 0x00, 0x1a, 0x12, 0x07, 0x2e, 0x00, 0x12, 0x80, 0x07, 0x00, 0x22, 0x30, 0x42, 0x08, 0x00, 0x0f, 0x02, 0x00, 0x17, 0x12, 0x08, 0x2b, 0x00, 0x03, 0x40, 0x00, 0x3f, 0x35, 0x31 ]
blk_prob : 0x00000870 = (qword)0x8014008f8c0001ff
data_2 : 0x00000878 = [ 0x32, 0x42, 0x00, 0x1c, 0x1b, 0x09, 0x40, 0x00, 0x1f, 0x33, 0x40, 0x00, 0x1c, 0x0f, 0x02, 0x00, 0xe8, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ]
txg : 0x00000890 = (qword)0x0000000000000022
data_3 : 0x00000898 = [ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ]

Считаем эти данные в файл
Последовательно копируем 48 байт и пропустив blk_prob (8 байт) оставшиеся 23 байта (полный размер берется из поля PSIZE).
# dd if=os.dataset.dnode.l0.bin of=/tmp/emb.bin.lz4 bs=1 count=48 skip=2112
# dd if=os.dataset.dnode.l0.bin of=/tmp/emb.bin.lz4 bs=1 seek=48 count=23 skip=2168
# zdec emb.bin.lz4 emb.bin 512
Input: emb.bin.lz4
Output: emb.bin
Out size: 512
-----------------------------
Input size: 71
Real input size: 67
Decompress result: 0

# r2 emb.bin
[0x00000000]> pf qqq[5]qqxwz mz_block_type mz_salt mz_normflags mz_pad[5] mz_chunk[1]_mze_value mz_chunk[1]_mze_cd mz_chunk[1]_mze_pad mz_chunk[1]_mze_name
mz_block_type : 0x00000000 = (qword)0x8000000000000003
mz_salt : 0x00000008 = (qword)0x00000003fd073129
mz_normflags : 0x00000010 = (qword)0x0000000000000000
mz_pad[5] : 0x00000018 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]
mz_chunk[1]_mze_value : 0x00000040 = (qword)0x8000000000000007
mz_chunk[1]_mze_cd : 0x00000048 = 0x00000000
mz_chunk[1]_mze_pad : 0x0000004c = 0x0000
mz_chunk[1]_mze_name : 0x0000004e = 0B
[0x00000000]> s+0x80
[0x00000080]> pf qxwz mze_value mze_cd mze_pad mze_name
mze_value : 0x00000080 = (qword)0x8000000000000008
mze_cd : 0x00000088 = 0x00000000
mze_pad : 0x0000008c = 0x0000
mze_name : 0x0000008e = 512B
[0x00000080]> s+0x40
[0x000000c0]> pf qxwz mze_value mze_cd mze_pad mze_name
mze_value : 0x000000c0 = (qword)0x8000000000000009
mze_cd : 0x000000c8 = 0x00000000
mze_pad : 0x000000cc = 0x0000
mze_name : 0x000000ce = 513B

mze_value : 0x8000000000000007
ZFS_DIRENT_TYPE : 8 // "? (0x8000000000000007>60)&((1<4)-1)" // /* 8 */ "Regular File",
ZFS_DIRENT_OBJ : 7 // "? (0x8000000000000007>0)&((1<48)-1)" // Object id

0B файл имеет номер 7
512B файл имеет номер 8
513B файл имеет номер 9

Считаем объект 7
# r2 os.dataset.dnode.l0.bin
[0x00000000]> 0x00000e00
[0x00000e00]> s+0x40
[0x00000e40]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00000e40 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_dva_1 : 0x00000e50 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_dva_2 : 0x00000e60 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_prop : 0x00000e70 = (qword)0x0000000000000000
blk_pad[2] : 0x00000e78 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00000e88 = (qword)0x0000000000000000
blk_birth : 0x00000e90 = (qword)0x0000000000000000
blk_fill : 0x00000e98 = (qword)0x0000000000000000
blk_cksum : 0x00000ea0 = (qword)[ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000 ]

Файл не содержит данных — blkptr пустой.

Считаем объект 8
[0x00000e40]> 0x00001000
[0x00001000]> s+0x40
[0x00001040]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00001040 = (qword)[ 0x0000000000000001, 0x00000000000000e9 ]
blk_dva_1 : 0x00001050 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_dva_2 : 0x00001060 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_prop : 0x00001070 = (qword)0x8013070200000000
blk_pad[2] : 0x00001078 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00001088 = (qword)0x0000000000000000
blk_birth : 0x00001090 = (qword)0x0000000000000020
blk_fill : 0x00001098 = (qword)0x0000000000000001
blk_cksum : 0x000010a0 = (qword)[ 0x0000003c34e2ea5c, 0x00000f3db2d3ec9f, 0x00029bdcc6458734, 0x005654ddd2b56e82 ]

image

Файл занимает на диске один сектор, т.е. 512 байт.

Считаем объект 9
[0x00001040]> 0x1200
[0x00001200]> s+0x40
[0x00001240]> pf [2]q[2]q[2]qq[2]qqqq[4]q blk_dva_0 blk_dva_1 blk_dva_2 blk_prop blk_pad[2] blk_phys_birth blk_birth blk_fill blk_cksum
blk_dva_0 : 0x00001240 = (qword)[ 0x0000000000000001, 0x000000000000009d ]
blk_dva_1 : 0x00001250 = (qword)[ 0x0000000000000001, 0x0000000000000059 ]
blk_dva_2 : 0x00001260 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_prop : 0x00001270 = (qword)0x8113070f0000001f
blk_pad[2] : 0x00001278 = (qword)[ 0x0000000000000000, 0x0000000000000000 ]
blk_phys_birth : 0x00001288 = (qword)0x0000000000000000
blk_birth : 0x00001290 = (qword)0x0000000000000022
blk_fill : 0x00001298 = (qword)0x0000000000000002
blk_cksum : 0x000012a0 = (qword)[ 0x0000001427d4c96a, 0x000007e5038b685d, 0x000194254db44203, 0x0037093ef743abcc ]

image

Файл размером 513 байт не помещается полностью в recordsize равную 512 байтам и для его хранения задействуется косвенный блок.
Косвенный блок хранится в двух экземплярах (blk_dva_0 и blk_dva_1).
Отсюда размеры файлов на диске:
0B: dnode(512B) = 512 байт
512B: dnode(512B) + данные файла(512B) = 1024 байт
513B: dnode(512B) + 2*косвенных блока(512B) + 2*данные файла(512B) = 2560 байт

Программа для распаковки блока сжатого алгоритмом lz4

Представляет собой копию функции LZ4_uncompress_unknownOutputSize из файла lz4.c

#include <iostream> #include <fstream> #include <cstdint> #include <cstring>  using namespace std;  static int LZ4_uncompress_unknownOutputSize(const char *source, char *dest, int isize, int maxOutputSize);   #define BE_IN8(xa) \         *((uint8_t *)(xa))  #define BE_IN16(xa) \ (((uint16_t)BE_IN8(xa) << 8) | BE_IN8((uint8_t *)(xa)+1))  #define BE_IN32(xa) \ (((uint32_t)BE_IN16(xa) << 16) | BE_IN16((uint8_t *)(xa)+2))   #define COMPRESSIONLEVEL 12 #define NOTCOMPRESSIBLE_CONFIRMATION 6  /*  *  * CPU Feature Detection  */  /* 32 or 64 bits ? */ #if defined(_LP64) #define LZ4_ARCH64 1 #else #define LZ4_ARCH64 0 #endif  /*  * Little Endian or Big Endian?  * Note: overwrite the below #define if you know your architecture endianess.  */ #if defined(_BIG_ENDIAN) #define LZ4_BIG_ENDIAN 1 #else /*  * Little Endian assumed. PDP Endian and other very rare endian format  * are unsupported.  */ #undef LZ4_BIG_ENDIAN #endif  /*  * Unaligned memory access is automatically enabled for "common" CPU,  * such as x86. For others CPU, the compiler will be more cautious, and  * insert extra code to ensure aligned access is respected. If you know  * your target CPU supports unaligned memory access, you may want to  * force this option manually to improve performance  */ #if defined(__ARM_FEATURE_UNALIGNED) #define LZ4_FORCE_UNALIGNED_ACCESS 1 #endif  /*  * Illumos : we can't use GCC's __builtin_ctz family of builtins in the  * kernel  * Linux : we can use GCC's __builtin_ctz family of builtins in the  * kernel  */ #undef  LZ4_FORCE_SW_BITCOUNT #if defined(__sparc) #define LZ4_FORCE_SW_BITCOUNT #endif  /*  * Compiler Options  */ /* Disable restrict */ #define restrict  /*  * Linux : GCC_VERSION is defined as of 3.9-rc1, so undefine it.  * torvalds/linux@3f3f8d2f48acfd8ed3b8e6b7377935da57b27b16  */ #ifdef GCC_VERSION #undef GCC_VERSION #endif  #define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)  #if (GCC_VERSION >= 302) || (__INTEL_COMPILER >= 800) || defined(__clang__) #define expect(expr, value)    (__builtin_expect((expr), (value))) #else #define expect(expr, value)    (expr) #endif  #ifndef likely #define likely(expr)    expect((expr) != 0, 1) #endif  #ifndef unlikely #define unlikely(expr)  expect((expr) != 0, 0) #endif  #define lz4_bswap16(x) ((unsigned short int) ((((x) >> 8) & 0xffu) | \         (((x) & 0xffu) << 8)))  /* Basic types */ #define BYTE    uint8_t #define U16     uint16_t #define U32     uint32_t #define S32     int32_t #define U64     uint64_t  #ifndef LZ4_FORCE_UNALIGNED_ACCESS #pragma pack(1) #endif  typedef struct _U16_S {         U16 v; } U16_S; typedef struct _U32_S {         U32 v; } U32_S; typedef struct _U64_S {         U64 v; } U64_S;  #ifndef LZ4_FORCE_UNALIGNED_ACCESS #pragma pack() #endif  #define A64(x) (((U64_S *)(x))->v) #define A32(x) (((U32_S *)(x))->v) #define A16(x) (((U16_S *)(x))->v)  /*  * Constants  */ #define MINMATCH 4  #define HASH_LOG COMPRESSIONLEVEL #define HASHTABLESIZE (1 << HASH_LOG) #define HASH_MASK (HASHTABLESIZE - 1)  #define SKIPSTRENGTH (NOTCOMPRESSIBLE_CONFIRMATION > 2 ? \         NOTCOMPRESSIBLE_CONFIRMATION : 2)  #define COPYLENGTH 8 #define LASTLITERALS 5 #define MFLIMIT (COPYLENGTH + MINMATCH) #define MINLENGTH (MFLIMIT + 1)  #define MAXD_LOG 16 #define MAX_DISTANCE ((1 << MAXD_LOG) - 1)  #define ML_BITS 4 #define ML_MASK ((1U<<ML_BITS)-1) #define RUN_BITS (8-ML_BITS) #define RUN_MASK ((1U<<RUN_BITS)-1)  /*  * Architecture-specific macros  */ #if LZ4_ARCH64 #define STEPSIZE 8 #define UARCH U64 #define AARCH A64 #define LZ4_COPYSTEP(s, d)      A64(d) = A64(s); d += 8; s += 8; #define LZ4_COPYPACKET(s, d)    LZ4_COPYSTEP(s, d) #define LZ4_SECURECOPY(s, d, e) if (d < e) LZ4_WILDCOPY(s, d, e) #define HTYPE U32 #define INITBASE(base)          const BYTE* const base = ip #else /* !LZ4_ARCH64 */ #define STEPSIZE 4 #define UARCH U32 #define AARCH A32 #define LZ4_COPYSTEP(s, d)      A32(d) = A32(s); d += 4; s += 4; #define LZ4_COPYPACKET(s, d)    LZ4_COPYSTEP(s, d); LZ4_COPYSTEP(s, d); #define LZ4_SECURECOPY          LZ4_WILDCOPY #define HTYPE const BYTE * #define INITBASE(base)          const int base = 0 #endif /* !LZ4_ARCH64 */  #if (defined(LZ4_BIG_ENDIAN) && !defined(BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE)) #define LZ4_READ_LITTLEENDIAN_16(d, s, p) \         { U16 v = A16(p); v = lz4_bswap16(v); d = (s) - v; } #define LZ4_WRITE_LITTLEENDIAN_16(p, i) \         { U16 v = (U16)(i); v = lz4_bswap16(v); A16(p) = v; p += 2; } #else #define LZ4_READ_LITTLEENDIAN_16(d, s, p) { d = (s) - A16(p); } #define LZ4_WRITE_LITTLEENDIAN_16(p, v)  { A16(p) = v; p += 2; } #endif   /* Local structures */ struct refTables {         HTYPE hashTable[HASHTABLESIZE]; };   /* Macros */ #define LZ4_HASH_FUNCTION(i) (((i) * 2654435761U) >> ((MINMATCH * 8) - \         HASH_LOG)) #define LZ4_HASH_VALUE(p) LZ4_HASH_FUNCTION(A32(p)) #define LZ4_WILDCOPY(s, d, e) do { LZ4_COPYPACKET(s, d) } while (d < e); #define LZ4_BLINDCOPY(s, d, l) { BYTE* e = (d) + l; LZ4_WILDCOPY(s, d, e); \ d = e; }    static int LZ4_uncompress_unknownOutputSize(const char *source, char *dest, int isize,     int maxOutputSize) {         /* Local Variables */         const BYTE *restrict ip = (const BYTE *) source;         const BYTE *const iend = ip + isize;         const BYTE *ref;          BYTE *op = (BYTE *) dest;         BYTE *const oend = op + maxOutputSize;         BYTE *cpy;          size_t dec32table[] = {0, 3, 2, 3, 0, 0, 0, 0}; #if LZ4_ARCH64         size_t dec64table[] = {0, 0, 0, (size_t)-1, 0, 1, 2, 3}; #endif          /* Main Loop */         while (ip < iend) {                 unsigned token;                 size_t length;                  /* get runlength */                 token = *ip++;                 if ((length = (token >> ML_BITS)) == RUN_MASK) {                         int s = 255;                         while ((ip < iend) && (s == 255)) {                                 s = *ip++;                                 length += s;                         }                 }                 /* copy literals */                 cpy = op + length;                 /* CORNER-CASE: cpy might overflow. */                 if (cpy < op)                         goto _output_error;     /* cpy was overflowed, bail! */                 if ((cpy > oend - COPYLENGTH) ||                     (ip + length > iend - COPYLENGTH)) {                         if (cpy > oend)                                 /* Error: writes beyond output buffer */                                 goto _output_error;                         if (ip + length != iend)                                 /*                                  * Error: LZ4 format requires to consume all                                  * input at this stage                                  */                                 goto _output_error;                         (void) memcpy(op, ip, length);                         op += length;                         /* Necessarily EOF, due to parsing restrictions */                         break;                 }                 LZ4_WILDCOPY(ip, op, cpy);                 ip -= (op - cpy);                 op = cpy;                  /* get offset */                 LZ4_READ_LITTLEENDIAN_16(ref, cpy, ip);                 ip += 2;                 if (ref < (BYTE * const) dest)                         /*                          * Error: offset creates reference outside of                          * destination buffer                          */                         goto _output_error;                  /* get matchlength */                 if ((length = (token & ML_MASK)) == ML_MASK) {                         while (ip < iend) {                                 int s = *ip++;                                 length += s;                                 if (s == 255)                                         continue;                                 break;                         }                 }                 /* copy repeated sequence */                 if (unlikely(op - ref < STEPSIZE)) { #if LZ4_ARCH64                         size_t dec64 = dec64table[op-ref]; #else                         const int dec64 = 0; #endif                         op[0] = ref[0];                         op[1] = ref[1];                         op[2] = ref[2];                         op[3] = ref[3];                         op += 4;                         ref += 4;                         ref -= dec32table[op-ref];                         A32(op) = A32(ref);                         op += STEPSIZE - 4;                         ref -= dec64;                 } else {                         LZ4_COPYSTEP(ref, op);                 }                 cpy = op + length - (STEPSIZE - 4);                 if (cpy > oend - COPYLENGTH) {                         if (cpy > oend)                                 /*                                  * Error: request to write outside of                                  * destination buffer                                  */                                 goto _output_error;                         LZ4_SECURECOPY(ref, op, (oend - COPYLENGTH));                         while (op < cpy)                                 *op++ = *ref++;                         op = cpy;                         if (op == oend)                                 /*                                  * Check EOF (should never happen, since                                  * last 5 bytes are supposed to be literals)                                  */                                 goto _output_error;                         continue;                 }                 LZ4_SECURECOPY(ref, op, cpy);                 op = cpy;       /* correction */         }          /* end of decoding */         return (int)(((char *)op) - dest);          /* write overflow error detected */         _output_error:         return (int)(-(((char *)ip) - source)); }  /*ARGSUSED*/ int lz4_decompress_zfs(void *s_start, void *d_start, size_t s_len,     size_t d_len, int n) {         const char *src = (const char*) s_start;         uint32_t bufsiz = BE_IN32(src);          /* invalid compressed buffer size encoded at start */         if (bufsiz + sizeof (bufsiz) > s_len)                 return (1);          std::cout << "Real input size: " << bufsiz << std::endl;         /*          * Returns 0 on success (decompression function returned non-negative)          * and non-zero on failure (decompression function returned negative.          */         return (LZ4_uncompress_unknownOutputSize(&src[sizeof (bufsiz)],             (char*)d_start, bufsiz, d_len) < 0); }  int main( int argc, char **argv ) {         if (argc < 4) {                 std::cout << argv[0] << " <in> <out> <out_size>" << std::endl;                  return 1;         }          char* szInput = argv[1];         char* szOutput = argv[2];         int nOutSize = atoi(argv[3]);          std::cout << "Input: \t\t" << szInput << std::endl;         std::cout << "Output: \t" << szOutput << std::endl;         std::cout << "Out size: \t" << nOutSize << std::endl;         std::cout << "-----------------------------" << std::endl;  // READ INPUT         fstream fs(szInput, fstream::in);         if (!fs.is_open()) {                 std::cout << "Open error";                 return 1;         }          fs.seekg(0, ios::end);         int fileSize = fs.tellg();         std::cout << "Input size: \t" << fileSize << std::endl;          char* src = new char[fileSize];          fs.seekg(0, ios::beg);          fs.read(src, fileSize);         if (!fs) {                 std::cout << "error: only " << fs.gcount() << " could be read";                 fs.close();                 return 1;         }         fs.close(); // END READ INPUT  // DECOMPRESS         char* dst = new char[nOutSize];         std::memset(dst, 0, nOutSize);          int nRes = lz4_decompress_zfs(src, dst, fileSize, nOutSize, 0);         std::cout << "Decompress result: " << nRes << std::endl;         if (nRes) {                 std::cout << "Decompress error" << std::endl; //              return 1;         } // END DECOMPRESS  // OUTPUT         fstream out(szOutput, fstream::out);         if (!out.is_open()) {                 std::cout << "Open error";                 return 1;         }          out.write(dst, nOutSize);         if (!out) {                 std::cout << "error: only " << out.gcount() << " could be write";                 out.close();                 return 1;         }         out.close();  // END OUTPUT          delete[] src;         delete[] dst;          return 0; } 

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