https://wiki.freebsd.org/ZFS
I have attached a magic file for ZFS dumps downloaded from the above page. I
have never tested it but I expect that the FreeBSD people know what they are
doing.
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#--
# zfs: file(1) magic for ZFS dumps
#
# From rea-f...@codelabs.ru
# ZFS dump header has the following structure (as per zfs_ioctl.h
# in FreeBSD with drr_type is set to DRR_BEGIN)
#
# enum {
# DRR_BEGIN, DRR_OBJECT, DRR_FREEOBJECTS,
# DRR_WRITE, DRR_FREE, DRR_END,
# } drr_type;
# uint32_t drr_pad;
# uint64_t drr_magic;
# uint64_t drr_version;
# uint64_t drr_creation_time;
# dmu_objset_type_t drr_type;
# uint32_t drr_pad;
# uint64_t drr_toguid;
# uint64_t drr_fromguid;
# char drr_toname[MAXNAMELEN];
#
# Backup magic is 0x0002f5bacbac (quad word)
# The drr_type is defined as
# typedef enum dmu_objset_type {
# DMU_OST_NONE,
# DMU_OST_META,
# DMU_OST_ZFS,
# DMU_OST_ZVOL,
# DMU_OST_OTHER, /* For testing only! */
# DMU_OST_ANY,/* Be careful! */
# DMU_OST_NUMTYPES
# } dmu_objset_type_t;
#
# Almost all uint64_t fields are printed as the 32-bit ones (with high
# 32 bits zeroed), because there is no simple way to print them as the
# full 64-bit values.
# Big-endian values
8 string \000\000\000\002\365\272\313\254 ZFS shapshot (big-endian
machine),
20belong 0 version %lu,
32belong 0type: NONE,
32belong 1type: META,
32belong 2type: ZFS,
32belong 3type: ZVOL,
32belong 4type: OTHER,
32belong 5type: ANY,
32belong 5
32belong 0 type: UNKNOWN (%lu),
40byte0 destination GUID: %02X
41byte0 %02X
42byte0 %02X
43byte0 %02X
44byte0 %02X
45byte0 %02X
46byte0 %02X
47byte0 %02X,
48ulong 0
52ulong 0
48byte0 source GUID: %02X
49byte0 %02X
50byte0 %02X
51byte0 %02X
52byte0 %02X
53byte0 %02X
54byte0 %02X
55byte0 %02X,
56string \0 name: '%s'
# Little-endian values
8 string \254\313\272\365\002\000\000\000 ZFS shapshot (little-endian
machine),
16lelong 0 version %lu,
32lelong 0type: NONE,
32lelong 1type: META,
32lelong 2type: ZFS,
32lelong 3type: ZVOL,
32lelong 4type: OTHER,
32lelong 5type: ANY,
32lelong 5
32lelong 0 type: UNKNOWN (%lu),
47byte0 destination GUID: %02X
46byte0 %02X
45byte0 %02X
44byte0 %02X
43byte0 %02X
42byte0 %02X
41byte0 %02X
40byte0 %02X,
48ulong 0
52ulong 0
55byte0 source GUID: %02X
54byte0 %02X
53byte0 %02X
52byte0 %02X
51byte0 %02X
50byte0 %02X
49byte0 %02X
48byte0 %02X,
56string \0 name: '%s'
