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apfs_raw.h
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2019 Ernesto A. Fernández <[email protected]>
*
* Definitions for all on-disk data structures.
*/
#ifndef _APFS_RAW_H
#define _APFS_RAW_H
#include <linux/types.h>
#include <linux/uuid.h>
/* Object identifiers constants */
#define APFS_OID_NX_SUPERBLOCK 1
#define APFS_OID_INVALID 0ULL
#define APFS_OID_RESERVED_COUNT 1024
/* Object type masks */
#define APFS_OBJECT_TYPE_MASK 0x0000ffff
#define APFS_OBJECT_TYPE_FLAGS_MASK 0xffff0000
#define APFS_OBJ_STORAGETYPE_MASK 0xc0000000
#define APFS_OBJECT_TYPE_FLAGS_DEFINED_MASK 0xf8000000
/* Object types */
#define APFS_OBJECT_TYPE_NX_SUPERBLOCK 0x00000001
#define APFS_OBJECT_TYPE_BTREE 0x00000002
#define APFS_OBJECT_TYPE_BTREE_NODE 0x00000003
#define APFS_OBJECT_TYPE_SPACEMAN 0x00000005
#define APFS_OBJECT_TYPE_SPACEMAN_CAB 0x00000006
#define APFS_OBJECT_TYPE_SPACEMAN_CIB 0x00000007
#define APFS_OBJECT_TYPE_SPACEMAN_BITMAP 0x00000008
#define APFS_OBJECT_TYPE_SPACEMAN_FREE_QUEUE 0x00000009
#define APFS_OBJECT_TYPE_EXTENT_LIST_TREE 0x0000000a
#define APFS_OBJECT_TYPE_OMAP 0x0000000b
#define APFS_OBJECT_TYPE_CHECKPOINT_MAP 0x0000000c
#define APFS_OBJECT_TYPE_FS 0x0000000d
#define APFS_OBJECT_TYPE_FSTREE 0x0000000e
#define APFS_OBJECT_TYPE_BLOCKREFTREE 0x0000000f
#define APFS_OBJECT_TYPE_SNAPMETATREE 0x00000010
#define APFS_OBJECT_TYPE_NX_REAPER 0x00000011
#define APFS_OBJECT_TYPE_NX_REAP_LIST 0x00000012
#define APFS_OBJECT_TYPE_OMAP_SNAPSHOT 0x00000013
#define APFS_OBJECT_TYPE_EFI_JUMPSTART 0x00000014
#define APFS_OBJECT_TYPE_FUSION_MIDDLE_TREE 0x00000015
#define APFS_OBJECT_TYPE_NX_FUSION_WBC 0x00000016
#define APFS_OBJECT_TYPE_NX_FUSION_WBC_LIST 0x00000017
#define APFS_OBJECT_TYPE_ER_STATE 0x00000018
#define APFS_OBJECT_TYPE_GBITMAP 0x00000019
#define APFS_OBJECT_TYPE_GBITMAP_TREE 0x0000001a
#define APFS_OBJECT_TYPE_GBITMAP_BLOCK 0x0000001b
#define APFS_OBJECT_TYPE_ER_RECOVERY_BLOCK 0x0000001c
#define APFS_OBJECT_TYPE_SNAP_META_EXT 0x0000001d
#define APFS_OBJECT_TYPE_INTEGRITY_META 0x0000001e
#define APFS_OBJECT_TYPE_FEXT_TREE 0x0000001f
#define APFS_OBJECT_TYPE_RESERVED_20 0x00000020
#define APFS_OBJECT_TYPE_INVALID 0x00000000
#define APFS_OBJECT_TYPE_TEST 0x000000ff
/* Object type flags */
#define APFS_OBJ_VIRTUAL 0x00000000
#define APFS_OBJ_EPHEMERAL 0x80000000
#define APFS_OBJ_PHYSICAL 0x40000000
#define APFS_OBJ_NOHEADER 0x20000000
#define APFS_OBJ_ENCRYPTED 0x10000000
#define APFS_OBJ_NONPERSISTENT 0x08000000
#define APFS_MAX_CKSUM_SIZE 8
/*
* On-disk representation of an APFS object
*/
struct apfs_obj_phys {
/*00*/ __le64 o_cksum; /* Fletcher checksum */
__le64 o_oid; /* Object-id */
/*10*/ __le64 o_xid; /* Transaction ID */
__le32 o_type; /* Object type */
__le32 o_subtype; /* Object subtype */
} __packed;
/* Flags for the object map structure */
#define APFS_OMAP_MANUALLY_MANAGED 0x00000001
#define APFS_OMAP_ENCRYPTING 0x00000002
#define APFS_OMAP_DECRYPTING 0x00000004
#define APFS_OMAP_KEYROLLING 0x00000008
#define APFS_OMAP_CRYPTO_GENERATION 0x00000010
#define APFS_OMAP_FLAGS_VALID_MASK (APFS_OMAP_MANUALLY_MANAGED \
| APFS_OMAP_ENCRYPTING \
| APFS_OMAP_DECRYPTING \
| APFS_OMAP_KEYROLLING \
| APFS_OMAP_CRYPTO_GENERATION)
/*
* On-disk representation of an object map
*/
struct apfs_omap_phys {
/*00*/ struct apfs_obj_phys om_o;
/*20*/ __le32 om_flags;
__le32 om_snap_count;
__le32 om_tree_type;
__le32 om_snapshot_tree_type;
/*30*/ __le64 om_tree_oid;
__le64 om_snapshot_tree_oid;
/*40*/ __le64 om_most_recent_snap;
__le64 om_pending_revert_min;
__le64 om_pending_revert_max;
} __packed;
/* Object map value flags */
#define APFS_OMAP_VAL_DELETED 0x00000001
#define APFS_OMAP_VAL_SAVED 0x00000002
#define APFS_OMAP_VAL_ENCRYPTED 0x00000004
#define APFS_OMAP_VAL_NOHEADER 0x00000008
#define APFS_OMAP_VAL_CRYPTO_GENERATION 0x00000010
#define APFS_OMAP_VAL_FLAGS_VALID_MASK (APFS_OMAP_VAL_DELETED \
| APFS_OMAP_VAL_SAVED \
| APFS_OMAP_VAL_ENCRYPTED \
| APFS_OMAP_VAL_NOHEADER \
| APFS_OMAP_VAL_CRYPTO_GENERATION)
/*
* Structure of a value in an object map B-tree
*/
struct apfs_omap_val {
__le32 ov_flags;
__le32 ov_size;
__le64 ov_paddr;
} __packed;
/*
* Structure of a value in an omap's snapshot tree
*/
struct apfs_omap_snapshot {
__le32 oms_flags;
__le32 oms_pad;
__le64 oms_oid;
} __packed;
/* B-tree node flags */
#define APFS_BTNODE_ROOT 0x0001
#define APFS_BTNODE_LEAF 0x0002
#define APFS_BTNODE_FIXED_KV_SIZE 0x0004
#define APFS_BTNODE_CHECK_KOFF_INVAL 0x8000
#define APFS_BTNODE_MASK 0x0007 /* Valid on-disk flags */
/* B-tree location constants */
#define APFS_BTOFF_INVALID 0xffff
/*
* Structure storing a location inside a B-tree node
*/
struct apfs_nloc {
__le16 off;
__le16 len;
} __packed;
/*
* Structure storing the location of a key/value pair within a B-tree node
*/
struct apfs_kvloc {
struct apfs_nloc k;
struct apfs_nloc v;
} __packed;
/*
* Structure storing the location of a key/value pair within a B-tree node
* having fixed-size key and value (flag APFS_BTNODE_FIXED_KV_SIZE is present)
*/
struct apfs_kvoff {
__le16 k;
__le16 v;
} __packed;
/*
* On-disk representation of a B-tree node
*/
struct apfs_btree_node_phys {
/*00*/ struct apfs_obj_phys btn_o;
/*20*/ __le16 btn_flags;
__le16 btn_level;
__le32 btn_nkeys;
/*28*/ struct apfs_nloc btn_table_space;
struct apfs_nloc btn_free_space;
struct apfs_nloc btn_key_free_list;
struct apfs_nloc btn_val_free_list;
/*38*/ __le64 btn_data[];
} __packed;
/* B-tree info flags */
#define APFS_BTREE_UINT64_KEYS 0x00000001
#define APFS_BTREE_SEQUENTIAL_INSERT 0x00000002
#define APFS_BTREE_ALLOW_GHOSTS 0x00000004
#define APFS_BTREE_EPHEMERAL 0x00000008
#define APFS_BTREE_PHYSICAL 0x00000010
#define APFS_BTREE_NONPERSISTENT 0x00000020
#define APFS_BTREE_KV_NONALIGNED 0x00000040
#define APFS_BTREE_FLAGS_VALID_MASK (APFS_BTREE_UINT64_KEYS \
| APFS_BTREE_SEQUENTIAL_INSERT \
| APFS_BTREE_ALLOW_GHOSTS \
| APFS_BTREE_EPHEMERAL \
| APFS_BTREE_PHYSICAL \
| APFS_BTREE_NONPERSISTENT \
| APFS_BTREE_KV_NONALIGNED)
/*
* Structure used to store information about a B-tree that won't change
* over time
*/
struct apfs_btree_info_fixed {
__le32 bt_flags;
__le32 bt_node_size;
__le32 bt_key_size;
__le32 bt_val_size;
} __packed;
/*
* Structure used to store information about a B-tree (located at the end of
* a B-tree root node block)
*/
struct apfs_btree_info {
struct apfs_btree_info_fixed bt_fixed;
__le32 bt_longest_key; /* Longest key ever stored */
__le32 bt_longest_val; /* Longest value ever stored */
__le64 bt_key_count;
__le64 bt_node_count;
} __packed;
/*
* Structure of the value of a directory entry. This is the data in
* the catalog nodes for record type APFS_TYPE_DIR_REC.
*/
struct apfs_drec_val {
__le64 file_id;
__le64 date_added;
__le16 flags;
u8 xfields[];
} __packed;
/* Physical extent records */
#define APFS_PEXT_LEN_MASK 0x0fffffffffffffffULL
#define APFS_PEXT_KIND_MASK 0xf000000000000000ULL
#define APFS_PEXT_KIND_SHIFT 60
/* The kind of a physical extent record */
enum {
APFS_KIND_ANY = 0,
APFS_KIND_NEW = 1,
APFS_KIND_UPDATE = 2,
APFS_KIND_DEAD = 3,
APFS_KIND_UPDATE_REFCNT = 4,
APFS_KIND_INVALID = 255 /* This is weird, won't fit in 4 bits */
};
#define APFS_OWNING_OBJ_ID_INVALID (~0ULL)
#define APFS_OWNING_OBJ_ID_UNKNOWN (~1ULL)
/*
* Structure of a physical extent record
*/
struct apfs_phys_ext_val {
__le64 len_and_kind;
__le64 owning_obj_id;
__le32 refcnt;
} __packed;
/* File extent records */
#define APFS_FILE_EXTENT_LEN_MASK 0x00ffffffffffffffULL
#define APFS_FILE_EXTENT_FLAG_MASK 0xff00000000000000ULL
#define APFS_FILE_EXTENT_FLAG_SHIFT 56
#define APFS_FILE_EXTENT_CRYPTO_FLAG 0x01 /* Made-up name */
#define APFS_FILE_EXTENT_PREALLOCATED 0x02 /* Made-up name */
#define APFS_VALID_FILE_EXTENT_FLAGS (APFS_FILE_EXTENT_CRYPTO_FLAG \
| APFS_FILE_EXTENT_PREALLOCATED)
/*
* Put a bound on maximum file size so that a growing truncation will always
* produce a single hole extent, even if 64k block sizes were in use. Larger
* file sizes could be supported with multiple extents of course, but it takes
* some work and I don't see the point.
*/
#define APFS_MAX_FILE_SIZE 0x00ffffffffff0000ULL
/*
* Structure of a file extent record
*/
struct apfs_file_extent_val {
__le64 len_and_flags;
__le64 phys_block_num;
__le64 crypto_id;
} __packed;
/*
* Structure of a data stream record
*/
struct apfs_dstream_id_val {
__le32 refcnt;
} __packed;
#define APFS_CP_MAX_WRAPPEDKEYSIZE 128
/*
* Structure used to store the encryption state for PFKs
*/
struct apfs_wrapped_crypto_state {
__le16 major_version;
__le16 minor_version;
__le32 cpflags;
__le32 persistent_class;
__le32 key_os_version;
__le16 key_revision;
__le16 key_len;
u8 persistent_key[];
} __packed;
/*
* Structure of a crypto state record
*/
struct apfs_crypto_state_val {
__le32 refcnt;
struct apfs_wrapped_crypto_state state;
} __packed;
/* Inode numbers for special inodes */
#define APFS_INVALID_INO_NUM 0
#define APFS_ROOT_DIR_PARENT 1 /* Root directory parent */
#define APFS_ROOT_DIR_INO_NUM 2 /* Root directory */
#define APFS_PRIV_DIR_INO_NUM 3 /* Private directory */
#define APFS_SNAP_DIR_INO_NUM 6 /* Snapshots metadata */
#define APFS_PURGEABLE_DIR_INO_NUM 7 /* Parent of purgeable files */
/* Smallest inode number available for user content */
#define APFS_MIN_USER_INO_NUM 16
#define APFS_UNIFIED_ID_SPACE_MARK 0x0800000000000000
/* Inode internal flags */
#define APFS_INODE_IS_APFS_PRIVATE 0x00000001
#define APFS_INODE_MAINTAIN_DIR_STATS 0x00000002
#define APFS_INODE_DIR_STATS_ORIGIN 0x00000004
#define APFS_INODE_PROT_CLASS_EXPLICIT 0x00000008
#define APFS_INODE_WAS_CLONED 0x00000010
#define APFS_INODE_FLAG_UNUSED 0x00000020
#define APFS_INODE_HAS_SECURITY_EA 0x00000040
#define APFS_INODE_BEING_TRUNCATED 0x00000080
#define APFS_INODE_HAS_FINDER_INFO 0x00000100
#define APFS_INODE_IS_SPARSE 0x00000200
#define APFS_INODE_WAS_EVER_CLONED 0x00000400
#define APFS_INODE_ACTIVE_FILE_TRIMMED 0x00000800
#define APFS_INODE_PINNED_TO_MAIN 0x00001000
#define APFS_INODE_PINNED_TO_TIER2 0x00002000
#define APFS_INODE_HAS_RSRC_FORK 0x00004000
#define APFS_INODE_NO_RSRC_FORK 0x00008000
#define APFS_INODE_ALLOCATION_SPILLEDOVER 0x00010000
#define APFS_INODE_FAST_PROMOTE 0x00020000
#define APFS_INODE_HAS_UNCOMPRESSED_SIZE 0x00040000
#define APFS_INODE_IS_PURGEABLE 0x00080000
#define APFS_INODE_WANTS_TO_BE_PURGEABLE 0x00100000
#define APFS_INODE_IS_SYNC_ROOT 0x00200000
#define APFS_INODE_SNAPSHOT_COW_EXEMPTION 0x00400000
/* This flag is not documented */
#define APFS_INODE_HAS_PURGEABLE_FLAGS 0x02000000
/* Masks for internal flags */
#define APFS_VALID_INTERNAL_INODE_FLAGS (APFS_INODE_IS_APFS_PRIVATE \
| APFS_INODE_MAINTAIN_DIR_STATS \
| APFS_INODE_DIR_STATS_ORIGIN \
| APFS_INODE_PROT_CLASS_EXPLICIT \
| APFS_INODE_WAS_CLONED \
| APFS_INODE_HAS_SECURITY_EA \
| APFS_INODE_BEING_TRUNCATED \
| APFS_INODE_HAS_FINDER_INFO \
| APFS_INODE_IS_SPARSE \
| APFS_INODE_WAS_EVER_CLONED \
| APFS_INODE_ACTIVE_FILE_TRIMMED \
| APFS_INODE_PINNED_TO_MAIN \
| APFS_INODE_PINNED_TO_TIER2 \
| APFS_INODE_HAS_RSRC_FORK \
| APFS_INODE_NO_RSRC_FORK \
| APFS_INODE_ALLOCATION_SPILLEDOVER \
| APFS_INODE_FAST_PROMOTE \
| APFS_INODE_HAS_UNCOMPRESSED_SIZE \
| APFS_INODE_IS_PURGEABLE \
| APFS_INODE_WANTS_TO_BE_PURGEABLE \
| APFS_INODE_IS_SYNC_ROOT \
| APFS_INODE_SNAPSHOT_COW_EXEMPTION \
| APFS_INODE_HAS_PURGEABLE_FLAGS)
#define APFS_INODE_INHERITED_INTERNAL_FLAGS (APFS_INODE_MAINTAIN_DIR_STATS)
#define APFS_INDOE_CLONED_INTERNAL_FLAGS (APFS_INODE_HAS_RSRC_FORK \
| APFS_INODE_NO_RSRC_FORK \
| APFS_INODE_HAS_FINDER_INFO)
#define APFS_INODE_PINNED_MASK (APFS_INODE_PINNED_TO_MAIN \
| APFS_INODE_PINNED_TO_TIER2)
/* BSD flags */
#define APFS_INOBSD_NODUMP 0x00000001
#define APFS_INOBSD_IMMUTABLE 0x00000002
#define APFS_INOBSD_APPEND 0x00000004
#define APFS_INOBSD_COMPRESSED 0x00000020
/*
* Structure of an inode as stored as a B-tree value
*/
struct apfs_inode_val {
/*00*/ __le64 parent_id;
__le64 private_id;
/*10*/ __le64 create_time;
__le64 mod_time;
__le64 change_time;
__le64 access_time;
/*30*/ __le64 internal_flags;
union {
__le32 nchildren;
__le32 nlink;
};
__le32 default_protection_class;
/*40*/ __le32 write_generation_counter;
__le32 bsd_flags;
__le32 owner;
__le32 group;
/*50*/ __le16 mode;
__le16 pad1;
__le64 uncompressed_size;
/*5C*/ u8 xfields[];
} __packed;
/* Extended field types for dentries */
#define APFS_DREC_EXT_TYPE_SIBLING_ID 1
/* Extended field types for inodes */
#define APFS_INO_EXT_TYPE_SNAP_XID 1
#define APFS_INO_EXT_TYPE_DELTA_TREE_OID 2
#define APFS_INO_EXT_TYPE_DOCUMENT_ID 3
#define APFS_INO_EXT_TYPE_NAME 4
#define APFS_INO_EXT_TYPE_PREV_FSIZE 5
#define APFS_INO_EXT_TYPE_RESERVED_6 6
#define APFS_INO_EXT_TYPE_FINDER_INFO 7
#define APFS_INO_EXT_TYPE_DSTREAM 8
#define APFS_INO_EXT_TYPE_RESERVED_9 9
#define APFS_INO_EXT_TYPE_DIR_STATS_KEY 10
#define APFS_INO_EXT_TYPE_FS_UUID 11
#define APFS_INO_EXT_TYPE_RESERVED_12 12
#define APFS_INO_EXT_TYPE_SPARSE_BYTES 13
#define APFS_INO_EXT_TYPE_RDEV 14
#define APFS_INO_EXT_TYPE_PURGEABLE_FLAGS 15
#define APFS_INO_EXT_TYPE_ORIG_SYNC_ROOT_ID 16
/* Extended field flags */
#define APFS_XF_DATA_DEPENDENT 0x01
#define APFS_XF_DO_NOT_COPY 0x02
#define APFS_XF_RESERVED_4 0x04
#define APFS_XF_CHILDREN_INHERIT 0x08
#define APFS_XF_USER_FIELD 0x10
#define APFS_XF_SYSTEM_FIELD 0x20
#define APFS_XF_RESERVED_40 0x40
#define APFS_XF_RESERVED_80 0x80
/* Constants for extended fields */
#define APFS_MIN_DOC_ID 3 /* Smallest not reserved document id */
/*
* Structure used to store the number and size of an xfield collection. The
* official reference seems to be wrong about @xf_used_data: it's the size of
* the xfield values alone, without the metadata.
*/
struct apfs_xf_blob {
__le16 xf_num_exts;
__le16 xf_used_data;
u8 xf_data[];
} __packed;
/*
* Structure used to describe an extended field
*/
struct apfs_x_field {
u8 x_type;
u8 x_flags;
__le16 x_size;
} __packed;
/*
* Structure used to store information about a data stream
*/
struct apfs_dstream {
__le64 size;
__le64 alloced_size;
__le64 default_crypto_id;
__le64 total_bytes_written;
__le64 total_bytes_read;
} __packed;
/*
* Structure used to store directory information
*/
struct apfs_dir_stats_val {
__le64 num_children;
__le64 total_size;
__le64 chained_key;
__le64 gen_count;
} __packed;
/*
* Structure of the value for a sibling link record. These are used to
* list the hard links for a given inode.
*/
struct apfs_sibling_val {
__le64 parent_id;
__le16 name_len;
u8 name[];
} __packed;
/*
* Structure of the value for a sibling map record. No idea what these are for.
*/
struct apfs_sibling_map_val {
__le64 file_id;
} __packed;
/*
* Structure of a key in an object map B-tree
*/
struct apfs_omap_key {
__le64 ok_oid;
__le64 ok_xid;
} __packed;
/*
* Structure of a key in a free-space queue b-tree
*/
struct apfs_spaceman_free_queue_key {
__le64 sfqk_xid;
__le64 sfqk_paddr;
} __packed;
/* Catalog records types */
enum {
APFS_TYPE_ANY = 0,
APFS_TYPE_SNAP_METADATA = 1,
APFS_TYPE_EXTENT = 2,
APFS_TYPE_INODE = 3,
APFS_TYPE_XATTR = 4,
APFS_TYPE_SIBLING_LINK = 5,
APFS_TYPE_DSTREAM_ID = 6,
APFS_TYPE_CRYPTO_STATE = 7,
APFS_TYPE_FILE_EXTENT = 8,
APFS_TYPE_DIR_REC = 9,
APFS_TYPE_DIR_STATS = 10,
APFS_TYPE_SNAP_NAME = 11,
APFS_TYPE_SIBLING_MAP = 12,
APFS_TYPE_MAX_VALID = 12,
APFS_TYPE_MAX = 15,
APFS_TYPE_INVALID = 15,
};
/* Bit masks for the 'obj_id_and_type' field of a key header */
#define APFS_OBJ_ID_MASK 0x0fffffffffffffffULL
#define APFS_OBJ_TYPE_MASK 0xf000000000000000ULL
#define APFS_OBJ_TYPE_SHIFT 60
/* Key header for filesystem-object keys */
struct apfs_key_header {
__le64 obj_id_and_type;
} __packed;
/*
* Structure of the key for a physical extent record
*/
struct apfs_phys_ext_key {
struct apfs_key_header hdr;
} __packed;
/*
* Structure of the key for an inode record
*/
struct apfs_inode_key {
struct apfs_key_header hdr;
} __packed;
/*
* Structure of the key for a file extent record
*/
struct apfs_file_extent_key {
struct apfs_key_header hdr;
__le64 logical_addr;
} __packed;
/*
* Structure of the key for a data stream record
*/
struct apfs_dstream_id_key {
struct apfs_key_header hdr;
} __packed;
/*
* Structure of the key for a crypto state record
*/
struct apfs_crypto_state_key {
struct apfs_key_header hdr;
} __packed;
/* Bit masks for the 'name_len_and_hash' field of a directory entry */
#define APFS_DREC_LEN_MASK 0x000003ff
#define APFS_DREC_HASH_MASK 0xfffffc00
#define APFS_DREC_HASH_SHIFT 10
/* We could support bigger filenames, but I don't know if Linux allows it */
#define APFS_NAME_LEN NAME_MAX
/* Bit masks for the 'type' field of a directory entry */
enum {
APFS_DREC_TYPE_MASK = 0x000f,
APFS_DREC_RESERVED_10 = 0x0010,
/* These flags are not documented */
APFS_DREC_PURGEABLE_2 = 0x0200,
APFS_DREC_PURGEABLE_8 = 0x0800,
};
#define APFS_DREC_PURGEABLE (APFS_DREC_PURGEABLE_2 | APFS_DREC_PURGEABLE_8)
/*
* Structure of the key for a directory entry - no hash, used on normalization
* sensitive volumes
*/
struct apfs_drec_key {
struct apfs_key_header hdr;
__le16 name_len;
u8 name[];
} __packed;
/*
* Structure of the key for a directory entry, including a precomputed
* hash of its name
*/
struct apfs_drec_hashed_key {
struct apfs_key_header hdr;
__le32 name_len_and_hash;
u8 name[];
} __packed;
/*
* Structure of the key for an extended attributes record
*/
struct apfs_xattr_key {
struct apfs_key_header hdr;
__le16 name_len;
u8 name[];
} __packed;
/*
* Structure of the key for a snapshot metadata record
*/
struct apfs_snap_metadata_key {
struct apfs_key_header hdr;
} __packed;
/* The snapshot name headers always have this placeholder object id */
#define APFS_SNAP_NAME_OBJ_ID (~0ULL & APFS_OBJ_ID_MASK)
/*
* Structure of the key for a snapshot name record
*/
struct apfs_snap_name_key {
struct apfs_key_header hdr;
__le16 name_len;
u8 name[];
} __packed;
/*
* Structure of the key for a sibling link record
*/
struct apfs_sibling_link_key {
struct apfs_key_header hdr;
__le64 sibling_id;
} __packed;
/*
* Structure of the key for a siblink map record
*/
struct apfs_sibling_map_key {
struct apfs_key_header hdr;
} __packed;
/*
* On-disk allocation info for a chunk of blocks
*/
struct apfs_chunk_info {
__le64 ci_xid;
__le64 ci_addr;
__le32 ci_block_count;
__le32 ci_free_count;
__le64 ci_bitmap_addr;
} __packed;
/* Constants for the chunk info block */
#define APFS_CI_COUNT_MASK 0x000FFFFF
#define APFS_CI_COUNT_RESERVED_MASK 0xFFF00000
/*
* Structure of a block with an array of chunk allocation info structures
*/
struct apfs_chunk_info_block {
struct apfs_obj_phys cib_o;
__le32 cib_index;
__le32 cib_chunk_info_count;
struct apfs_chunk_info cib_chunk_info[];
} __packed;
/*
* Structure of a block with an array of addresses to chunk information blocks
*/
struct apfs_cib_addr_block {
struct apfs_obj_phys cab_o;
__le32 cab_index;
__le32 cab_cib_count;
__le64 cab_cib_addr[];
} __packed;
/*
* On-disk structure for a free queue
*/
struct apfs_spaceman_free_queue {
__le64 sfq_count;
__le64 sfq_tree_oid;
__le64 sfq_oldest_xid;
__le16 sfq_tree_node_limit;
__le16 sfq_pad16;
__le32 sfq_pad32;
__le64 sfq_reserved;
} __packed;
/* Indexes for a free queue array */
enum {
APFS_SFQ_IP = 0,
APFS_SFQ_MAIN = 1,
APFS_SFQ_TIER2 = 2,
APFS_SFQ_COUNT = 3
};
/*
* On-disk structure for device allocation information
*/
struct apfs_spaceman_device {
__le64 sm_block_count;
__le64 sm_chunk_count;
__le32 sm_cib_count;
__le32 sm_cab_count;
__le64 sm_free_count;
__le32 sm_addr_offset;
__le32 sm_reserved;
__le64 sm_reserved2;
} __packed;
/* Indexes for a device array */
enum {
APFS_SD_MAIN = 0,
APFS_SD_TIER2 = 1,
APFS_SD_COUNT = 2
};
/*
* On-disk structure to describe allocation zone boundaries
*/
struct apfs_spaceman_allocation_zone_boundaries {
__le64 saz_zone_start;
__le64 saz_zone_end;
} __packed;
/* Allocation zone constants */
#define APFS_SM_ALLOCZONE_INVALID_END_BOUNDARY 0
#define APFS_SM_ALLOCZONE_NUM_PREVIOUS_BOUNDARIES 7
struct apfs_spaceman_allocation_zone_info_phys {
struct apfs_spaceman_allocation_zone_boundaries saz_current_boundaries;
struct apfs_spaceman_allocation_zone_boundaries
saz_previous_boundaries[APFS_SM_ALLOCZONE_NUM_PREVIOUS_BOUNDARIES];
__le16 saz_zone_id;
__le16 saz_previous_boundary_index;
__le32 saz_reserved;
} __packed;
/* Datazone constants */
#define APFS_SM_DATAZONE_ALLOCZONE_COUNT 8
struct apfs_spaceman_datazone_info_phys {
struct apfs_spaceman_allocation_zone_info_phys
sdz_allocation_zones[APFS_SD_COUNT][APFS_SM_DATAZONE_ALLOCZONE_COUNT];
} __packed;
/* Internal-pool bitmap constants */
#define APFS_SPACEMAN_IP_BM_TX_MULTIPLIER 16
#define APFS_SPACEMAN_IP_BM_INDEX_INVALID 0xFFFF
#define APFS_SPACEMAN_IP_BM_BLOCK_COUNT_MAX 0xFFFE
/* Space manager flags */
#define APFS_SM_FLAG_VERSIONED 0x00000001
#define APFS_SM_FLAGS_VALID_MASK APFS_SM_FLAG_VERSIONED
/*
* On-disk structure for the space manager
*/
struct apfs_spaceman_phys {
struct apfs_obj_phys sm_o;
__le32 sm_block_size;
__le32 sm_blocks_per_chunk;
__le32 sm_chunks_per_cib;
__le32 sm_cibs_per_cab;
struct apfs_spaceman_device sm_dev[APFS_SD_COUNT];
__le32 sm_flags;
__le32 sm_ip_bm_tx_multiplier;
__le64 sm_ip_block_count;
__le32 sm_ip_bm_size_in_blocks;
__le32 sm_ip_bm_block_count;
__le64 sm_ip_bm_base;
__le64 sm_ip_base;
__le64 sm_fs_reserve_block_count;
__le64 sm_fs_reserve_alloc_count;
struct apfs_spaceman_free_queue sm_fq[APFS_SFQ_COUNT];
__le16 sm_ip_bm_free_head;
__le16 sm_ip_bm_free_tail;
__le32 sm_ip_bm_xid_offset;
__le32 sm_ip_bitmap_offset;
__le32 sm_ip_bm_free_next_offset;
__le32 sm_version;
__le32 sm_struct_size;
struct apfs_spaceman_datazone_info_phys sm_datazone;
} __packed;
/*
* Structure used to store a range of physical blocks
*/
struct apfs_prange {
__le64 pr_start_paddr;
__le64 pr_block_count;
} __packed;
/* Reaper flags */
#define APFS_NR_BHM_FLAG 0x00000001
#define APFS_NR_CONTINUE 0x00000002
#define APFS_NR_FLAGS_VALID_MASK (APFS_NR_BHM_FLAG | APFS_NR_CONTINUE)
/*
* On-disk reaper structure
*/
struct apfs_nx_reaper_phys {
struct apfs_obj_phys nr_o;
__le64 nr_next_reap_id;
__le64 nr_completed_id;
__le64 nr_head;
__le64 nr_tail;
__le32 nr_flags;
__le32 nr_rlcount;
__le32 nr_type;
__le32 nr_size;
__le64 nr_fs_oid;
__le64 nr_oid;
__le64 nr_xid;
__le32 nr_nrle_flags;
__le32 nr_state_buffer_size;
u8 nr_state_buffer[];
} __packed;
struct apfs_nx_reap_list_entry {
__le32 nrle_next;
__le32 nrle_flags;
__le32 nrle_type;
__le32 nrle_size;
__le64 nrle_fs_oid;
__le64 nrle_oid;
__le64 nrle_xid;
} __packed;
struct apfs_nx_reap_list_phys {
struct apfs_obj_phys nrl_o;
__le64 nrl_next;
__le32 nrl_flags;
__le32 nrl_max;
__le32 nrl_count;
__le32 nrl_first;
__le32 nrl_last;
__le32 nrl_free;
struct apfs_nx_reap_list_entry nrl_entries[];
} __packed;
/* EFI constants */
#define APFS_NX_EFI_JUMPSTART_MAGIC 0x5244534A
#define APFS_NX_EFI_JUMPSTART_VERSION 1
/*
* Information about the embedded EFI driver
*/
struct apfs_nx_efi_jumpstart {
struct apfs_obj_phys nej_o;
__le32 nej_magic;
__le32 nej_version;
__le32 nej_efi_file_len;
__le32 nej_num_extents;
__le64 nej_reserved[16];
struct apfs_prange nej_rec_extents[];
} __packed;
/* Main container */
/* Container constants */
#define APFS_NX_MAGIC 0x4253584E
#define APFS_NX_BLOCK_NUM 0
#define APFS_NX_MAX_FILE_SYSTEMS 100
#define APFS_NX_EPH_INFO_COUNT 4
#define APFS_NX_EPH_MIN_BLOCK_COUNT 8
#define APFS_NX_MAX_FILE_SYSTEM_EPH_STRUCTS 4
#define APFS_NX_TX_MIN_CHECKPOINT_COUNT 4
#define APFS_NX_EPH_INFO_VERSION_1 1
/* Container flags */
#define APFS_NX_RESERVED_1 0x00000001LL
#define APFS_NX_RESERVED_2 0x00000002LL
#define APFS_NX_CRYPTO_SW 0x00000004LL
#define APFS_NX_FLAGS_VALID_MASK (APFS_NX_RESERVED_1 \
| APFS_NX_RESERVED_2 \
| APFS_NX_CRYPTO_SW)
/* Optional container feature flags */
#define APFS_NX_FEATURE_DEFRAG 0x0000000000000001ULL
#define APFS_NX_FEATURE_LCFD 0x0000000000000002ULL
#define APFS_NX_SUPPORTED_FEATURES_MASK (APFS_NX_FEATURE_DEFRAG | \
APFS_NX_FEATURE_LCFD)
/* Read-only compatible container feature flags */
#define APFS_NX_SUPPORTED_ROCOMPAT_MASK (0x0ULL)
/* Incompatible container feature flags */
#define APFS_NX_INCOMPAT_VERSION1 0x0000000000000001ULL
#define APFS_NX_INCOMPAT_VERSION2 0x0000000000000002ULL
#define APFS_NX_INCOMPAT_FUSION 0x0000000000000100ULL
#define APFS_NX_SUPPORTED_INCOMPAT_MASK (APFS_NX_INCOMPAT_VERSION2 \
| APFS_NX_INCOMPAT_FUSION)
/* Block and container sizes */
#define APFS_NX_MINIMUM_BLOCK_SIZE 4096
#define APFS_NX_DEFAULT_BLOCK_SIZE 4096
#define APFS_NX_MAXIMUM_BLOCK_SIZE 65536
#define APFS_NX_MINIMUM_CONTAINER_SIZE 1048576
/* Indexes into a container superblock's array of counters */
enum {
APFS_NX_CNTR_OBJ_CKSUM_SET = 0,
APFS_NX_CNTR_OBJ_CKSUM_FAIL = 1,
APFS_NX_NUM_COUNTERS = 32
};
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0)
#define UUID_SIZE 16
#endif
/*
* On-disk representation of the container superblock
*/
struct apfs_nx_superblock {
/*00*/ struct apfs_obj_phys nx_o;
/*20*/ __le32 nx_magic;
__le32 nx_block_size;
__le64 nx_block_count;
/*30*/ __le64 nx_features;
__le64 nx_readonly_compatible_features;
__le64 nx_incompatible_features;
/*48*/ char nx_uuid[UUID_SIZE];
/*58*/ __le64 nx_next_oid;
__le64 nx_next_xid;
/*68*/ __le32 nx_xp_desc_blocks;
__le32 nx_xp_data_blocks;
/*70*/ __le64 nx_xp_desc_base;
__le64 nx_xp_data_base;
__le32 nx_xp_desc_next;
__le32 nx_xp_data_next;
/*88*/ __le32 nx_xp_desc_index;
__le32 nx_xp_desc_len;
__le32 nx_xp_data_index;
__le32 nx_xp_data_len;
/*98*/ __le64 nx_spaceman_oid;
__le64 nx_omap_oid;
__le64 nx_reaper_oid;
/*B0*/ __le32 nx_test_type;
__le32 nx_max_file_systems;
/*B8*/ __le64 nx_fs_oid[APFS_NX_MAX_FILE_SYSTEMS];
/*3D8*/ __le64 nx_counters[APFS_NX_NUM_COUNTERS];
/*4D8*/ struct apfs_prange nx_blocked_out_prange;
__le64 nx_evict_mapping_tree_oid;
/*4F0*/ __le64 nx_flags;
__le64 nx_efi_jumpstart;