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Ernesto A. Fernández
72e6425af6
Copy the code of the APFS module into its own repository, without the rest of the kernel tree. Development will continue upstream, but the intention is to make life easier for potential users. To get the module to build independently, rewrite the Makefile and add a definition for the APFS_SUPER_MAGIC macro. Since the intention is to support a range of kernel versions, use preprocessor checks to handle kernels without statx, without iversion, and without SB_RDONLY. Provide a README file based on the upstream documentation, but with additional build and mount instructions. Add a LICENSE file as well. Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* linux/fs/apfs/object.h
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*
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* Copyright (C) 2018 Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
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*/
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#ifndef _APFS_OBJECT_H
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#define _APFS_OBJECT_H
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#include <linux/types.h>
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/* Object identifiers constants */
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#define APFS_OID_NX_SUPERBLOCK 1
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#define APFS_OID_INVALID 0ULL
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#define APFS_OID_RESERVED_COUNT 1024
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/* Object type masks */
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#define APFS_OBJECT_TYPE_MASK 0x0000ffff
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#define APFS_OBJECT_TYPE_FLAGS_MASK 0xffff0000
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#define APFS_OBJ_STORAGETYPE_MASK 0xc0000000
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#define APFS_OBJECT_TYPE_FLAGS_DEFINED_MASK 0xf8000000
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/* Object types */
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#define APFS_OBJECT_TYPE_NX_SUPERBLOCK 0x00000001
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#define APFS_OBJECT_TYPE_BTREE 0x00000002
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#define APFS_OBJECT_TYPE_BTREE_NODE 0x00000003
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#define APFS_OBJECT_TYPE_SPACEMAN 0x00000005
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#define APFS_OBJECT_TYPE_SPACEMAN_CAB 0x00000006
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#define APFS_OBJECT_TYPE_SPACEMAN_CIB 0x00000007
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#define APFS_OBJECT_TYPE_SPACEMAN_BITMAP 0x00000008
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#define APFS_OBJECT_TYPE_SPACEMAN_FREE_QUEUE 0x00000009
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#define APFS_OBJECT_TYPE_EXTENT_LIST_TREE 0x0000000a
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#define APFS_OBJECT_TYPE_OMAP 0x0000000b
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#define APFS_OBJECT_TYPE_CHECKPOINT_MAP 0x0000000c
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#define APFS_OBJECT_TYPE_FS 0x0000000d
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#define APFS_OBJECT_TYPE_FSTREE 0x0000000e
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#define APFS_OBJECT_TYPE_BLOCKREFTREE 0x0000000f
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#define APFS_OBJECT_TYPE_SNAPMETATREE 0x00000010
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#define APFS_OBJECT_TYPE_NX_REAPER 0x00000011
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#define APFS_OBJECT_TYPE_NX_REAP_LIST 0x00000012
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#define APFS_OBJECT_TYPE_OMAP_SNAPSHOT 0x00000013
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#define APFS_OBJECT_TYPE_EFI_JUMPSTART 0x00000014
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#define APFS_OBJECT_TYPE_FUSION_MIDDLE_TREE 0x00000015
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#define APFS_OBJECT_TYPE_NX_FUSION_WBC 0x00000016
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#define APFS_OBJECT_TYPE_NX_FUSION_WBC_LIST 0x00000017
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#define APFS_OBJECT_TYPE_ER_STATE 0x00000018
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#define APFS_OBJECT_TYPE_GBITMAP 0x00000019
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#define APFS_OBJECT_TYPE_GBITMAP_TREE 0x0000001a
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#define APFS_OBJECT_TYPE_GBITMAP_BLOCK 0x0000001b
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#define APFS_OBJECT_TYPE_INVALID 0x00000000
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#define APFS_OBJECT_TYPE_TEST 0x000000ff
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/* Object type flags */
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#define APFS_OBJ_VIRTUAL 0x00000000
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#define APFS_OBJ_EPHEMERAL 0x80000000
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#define APFS_OBJ_PHYSICAL 0x40000000
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#define APFS_OBJ_NOHEADER 0x20000000
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#define APFS_OBJ_ENCRYPTED 0x10000000
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#define APFS_OBJ_NONPERSISTENT 0x08000000
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/*
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* On-disk representation of an APFS object
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*/
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struct apfs_obj_phys {
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/*00*/ __le64 o_cksum; /* Fletcher checksum */
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__le64 o_oid; /* Object-id */
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/*10*/ __le64 o_xid; /* Transaction ID */
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__le32 o_type; /* Object type */
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__le32 o_subtype; /* Object subtype */
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} __packed;
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/*
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* In-memory representation of an APFS object
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*/
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struct apfs_object {
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struct super_block *sb;
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u64 block_nr;
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u64 oid; /* Often the same as the block number */
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/*
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* Buffer head containing the one block of the object. TODO: support
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* objects with more than one block.
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*/
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struct buffer_head *bh;
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};
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#define APFS_MAX_CKSUM_SIZE 8
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extern int apfs_obj_verify_csum(struct super_block *sb,
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struct apfs_obj_phys *obj);
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#endif /* _APFS_OBJECT_H */
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