ext.h@ 93115

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1	/* $Id: ext.h 93115 2022-01-01 11:31:46Z vboxsync $ */
2	/** @file
3	* IPRT, Ext2/3/4 format.
4	*/
5
6	/*
7	* Copyright (C) 2012-2022 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27	#ifndef IPRT_INCLUDED_formats_ext_h
28	#define IPRT_INCLUDED_formats_ext_h
29	#ifndef RT_WITHOUT_PRAGMA_ONCE
30	# pragma once
31	#endif
32
33	#include <iprt/types.h>
34	#include <iprt/assertcompile.h>
35
36
37	/** @defgroup grp_rt_formats_ext Extended Filesystem (EXT2/3/4) structures and definitions
38	* @ingroup grp_rt_formats
39	* @{
40	*/
41
42	/*
43	* The filesystem structures were retrieved from:
44	* https://www.kernel.org/doc/html/latest/filesystems/ext4/index.html
45	*/
46
47	/** Offset where to find the first superblock on the disk, this is constant. */
48	#define EXT_SB_OFFSET 1024
49
50	/** @name EXT_INODE_NR_XXX - Special inode numbers.
51	* @{ */
52	#define EXT_INODE_NR_DEF_BLOCKS 1 /*< List of defective blocks. /
53	#define EXT_INODE_NR_ROOT_DIR 2 /*< Root directory. /
54	#define EXT_INODE_NR_USER_QUOTA 3 /*< User quota. /
55	#define EXT_INODE_NR_GROUP_QUOTA 4 /*< Group quota. /
56	#define EXT_INODE_NR_BOOT_LOADER 5 /*< Boot loader. /
57	#define EXT_INODE_NR_UNDEL_DIR 6 /*< Undelete directory. /
58	#define EXT_INODE_NR_RESV_GRP_DESC 7 /*< Reserved group descriptors inode. /
59	#define EXT_INODE_NR_JOURNAL 8 /*< Journal. /
60	#define EXT_INODE_NR_EXCLUDE 9 /*< Exclude inode. /
61	#define EXT_INODE_NR_REPLICA 10 /*< Replica inode. /
62	/** @} */
63
64	/**
65	* Ext superblock.
66	*
67	* Everything is stored little endian on the disk.
68	*/
69	typedef struct EXTSUPERBLOCK
70	{
71	/** 0x00: Total number of inodes in the filesystem. */
72	uint32_t cInodesTotal;
73	/** 0x04: Total number of blocks in the filesystem (low 32bits). */
74	uint32_t cBlocksTotalLow;
75	/** 0x08: Number of blocks reserved for the super user (low 32bits). */
76	uint32_t cBlocksRsvdForSuperUserLow;
77	/** 0x0c: Total number of free blocks (low 32bits). */
78	uint32_t cBlocksFreeLow;
79	/** 0x10: Total number of free inodes. */
80	uint32_t cInodesFree;
81	/** 0x14: First data block. */
82	uint32_t iBlockOfSuperblock;
83	/** 0x18: Block size (calculated as 2^(10 + cBitsShiftLeftBlockSize)). */
84	uint32_t cLogBlockSize;
85	/** 0x1c: Cluster size (calculated as 2^cLogClusterSize). */
86	uint32_t cLogClusterSize;
87	/** 0x20: Number of blocks in each block group. */
88	uint32_t cBlocksPerGroup;
89	/** 0x24: Number of clusters in each block group. */
90	uint32_t cClustersPerBlockGroup;
91	/** 0x28: Number of inodes for each block group. */
92	uint32_t cInodesPerBlockGroup;
93	/** 0x2c: Last mount time in seconds since epoch. */
94	uint32_t u32LastMountTime;
95	/** 0x30: Last written time in seconds since epoch. */
96	uint32_t u32LastWrittenTime;
97	/** 0x34: Number of times the volume was mounted since the last check. */
98	uint16_t cMountsSinceLastCheck;
99	/** 0x36: Number of mounts allowed before a consistency check. */
100	uint16_t cMaxMountsUntilCheck;
101	/** 0x38: Signature to identify a ext2 volume (EXT_SIGNATURE). */
102	uint16_t u16Signature;
103	/** 0x3a: State of the filesystem (EXT_SB_STATE_XXX) */
104	uint16_t u16FilesystemState;
105	/** 0x3c: What to do on an error. */
106	uint16_t u16ActionOnError;
107	/** 0x3e: Minor revision level. */
108	uint16_t u16RevLvlMinor;
109	/** 0x40: Time of last check in seconds since epoch. */
110	uint32_t u32LastCheckTime;
111	/** 0x44: Interval between consistency checks in seconds. */
112	uint32_t u32CheckInterval;
113	/** 0x48: Operating system ID of the filesystem creator (EXT_SB_OS_ID_CREATOR_XXX). */
114	uint32_t u32OsIdCreator;
115	/** 0x4c: Revision level (EXT_SB_REV_XXX). */
116	uint32_t u32RevLvl;
117	/** 0x50: User ID that is allowed to use reserved blocks. */
118	uint16_t u16UidReservedBlocks;
119	/** 0x52: Group ID that is allowed to use reserved blocks. */
120	uint16_t u16GidReservedBlocks;
121	/** 0x54: First non reserved inode number. */
122	uint32_t iFirstInodeNonRsvd;
123	/** 0x58: Size of the inode structure in bytes. */
124	uint16_t cbInode;
125	/** 0x5a: Block group number of this super block. */
126	uint16_t iBlkGrpSb;
127	/** 0x5c: Compatible feature set flags (EXT_SB_FEAT_COMPAT_XXX). */
128	uint32_t fFeaturesCompat;
129	/** 0x60: Incompatible feature set (EXT_SB_FEAT_INCOMPAT_XXX). */
130	uint32_t fFeaturesIncompat;
131	/** 0x64: Readonly-compatible feature set (EXT_SB_FEAT_COMPAT_RO_XXX). */
132	uint32_t fFeaturesCompatRo;
133	/** 0x68: 128bit UUID for the volume. */
134	uint8_t au8Uuid[16];
135	/** 0x78: Volume name. */
136	char achVolumeName[16];
137	/** 0x88: Directory were the filesystem was mounted last. */
138	char achLastMounted[64];
139	/** 0xc8: Bitmap usage algorithm (used for compression). */
140	uint32_t u32AlgoUsageBitmap;
141	/** 0xcc: Number of blocks to try to preallocate for files(?). */
142	uint8_t cBlocksPrealloc;
143	/** 0xcd: Number of blocks to try to preallocate for directories. */
144	uint8_t cBlocksPreallocDirectory;
145	/** 0xce: Number of reserved group descriptor entries for future filesystem expansion. */
146	uint16_t cGdtEntriesRsvd;
147	/** 0xd0: 128bit UUID for the journal superblock. */
148	uint8_t au8JournalUuid[16];
149	/** 0xe0: Inode number of the journal file. */
150	uint32_t iJournalInode;
151	/** 0xe4: Device number of journal file (if the appropriate feature flag is set). */
152	uint32_t u32JournalDev;
153	/** 0xe8: Start of list of orpaned inodes to delete. */
154	uint32_t u32LastOrphan;
155	/** 0xec: HTREE hash seed. */
156	uint32_t au32HashSeedHtree[4];
157	/** 0xfc: Default hash algorithm to use for hashes (EXT_SB_HASH_VERSION_DEF_XXX). */
158	uint8_t u8HashVersionDef;
159	/** 0xfd: Journal backup type. */
160	uint8_t u8JnlBackupType;
161	/** 0xfe: Group descriptor size in bytes. */
162	uint16_t cbGroupDesc;
163	/** 0x100: Default mount options (EXT_SB_MNT_OPTS_DEF_XXX). */
164	uint32_t fMntOptsDef;
165	/** 0x104: First metablock block group (if feature is enabled). */
166	uint32_t iFirstMetaBg;
167	/** 0x108: Filesystem creation time in seconds since epoch. */
168	uint32_t u32TimeFsCreation;
169	/** 0x10c: Backup copy of journals inodes block array for the first elements. */
170	uint32_t au32JnlBlocks[17];
171	/** 0x150: Total number of blocks in the filesystem (high 32bits). */
172	uint32_t cBlocksTotalHigh;
173	/** 0x154: Number of blocks reserved for the super user (high 32bits). */
174	uint32_t cBlocksRsvdForSuperUserHigh;
175	/** 0x158: Total number of free blocks (high 32bits). */
176	uint32_t cBlocksFreeHigh;
177	/** 0x15c: All inodes have at least this number of bytes. */
178	uint16_t cbInodesExtraMin;
179	/** 0x15e: New inodes should reserve this number of bytes. */
180	uint16_t cbNewInodesRsv;
181	/** 0x160: Miscellaneous flags (EXT_SB_F_XXX). */
182	uint32_t fFlags;
183	/** 0x164: RAID stride, number of logical blocks read from or written to the disk
184	* before moving to the next disk. */
185	uint16_t cRaidStride;
186	/** 0x166: Number of seconds between multi-mount prevention checking. */
187	uint16_t cSecMmpInterval;
188	/** 0x168: Block number for the multi-mount protection data. */
189	uint64_t iMmpBlock;
190	/** 0x170: Raid stride width. */
191	uint32_t cRaidStrideWidth;
192	/** 0x174: Size of a flexible block group (calculated as 2^cLogGroupsPerFlex). */
193	uint8_t cLogGroupsPerFlex;
194	/** 0x175: Metadata checksum algorithm type, only 1 is valid (for CRC32c). */
195	uint8_t u8ChksumType;
196	/** 0x176: Padding. */
197	uint16_t u16Padding;
198	/** 0x178: Number of KiB written to the filesystem so far. */
199	uint64_t cKbWritten;
200	/** 0x180: Inode number of active snapshot. */
201	uint32_t iSnapshotInode;
202	/** 0x184: Sequential ID of active snapshot. */
203	uint32_t iSnapshotId;
204	/** 0x188: Number of blocks reserved for activ snapshot's future use. */
205	uint64_t cSnapshotRsvdBlocks;
206	/** 0x190: Inode number of the head of the on-disk snapshot list. */
207	uint32_t iSnapshotListInode;
208	/** 0x194: Number of errors seen so far. */
209	uint32_t cErrorsSeen;
210	/** 0x198: First time an error happened in seconds since epoch. */
211	uint32_t u32TimeFirstError;
212	/** 0x19c: Inode involved in the first error. */
213	uint32_t iInodeFirstError;
214	/** 0x1a0: Number of block involved of first error. */
215	uint64_t iBlkFirstError;
216	/** 0x1a8: Name of the function where the first error happened. */
217	char achFuncFirstError[32];
218	/** 0x1c8: Line number where the error happened. */
219	uint32_t iLineFirstError;
220	/** 0x1cc: Time of the most receent error in seconds since epoch. */
221	uint32_t u32TimeLastError;
222	/** 0x1d0: Inode involved in the most recent error. */
223	uint32_t iInodeLastError;
224	/** 0x1d4: Line number where the most recent error happened. */
225	uint32_t iLineLastError;
226	/** 0x1d8: Number of block involved of most recent error. */
227	uint64_t iBlkLastError;
228	/** 0x1e0: Name of the function where the most recent error happened. */
229	char achFuncLastError[32];
230	/** 0x200: ASCIIz string of mount options. */
231	char aszMntOpts[64];
232	/** 0x240: Inode number of user quota file. */
233	uint32_t iInodeUsrQuota;
234	/** 0x244: Inode number of group quota file. */
235	uint32_t iInodeGrpQuota;
236	/** 0x248: Overhead blocks/clusters in filesystem. */
237	uint32_t cOverheadBlocks;
238	/** 0x24c: Block groups containing superblock backups. */
239	uint32_t aiBlkGrpSbBackups[2];
240	/** 0x254: Encryption algorithms in use (EXT_SB_ENCRYPT_ALGO_XXX). */
241	uint8_t au8EncryptAlgo[4];
242	/** 0x258: Salt for the string2key algorithm for encryption. */
243	uint8_t abEncryptPwSalt[16];
244	/** 0x268: Inode number of lost+found. */
245	uint32_t iInodeLostFound;
246	/** 0x26c: Inode that tracks project quotas. */
247	uint32_t iInodeProjQuota;
248	/** 0x270: Checksum seed used for the metadata checksum calculations.
249	* Should be crc32c(~0, au8Uuid). */
250	uint32_t u32ChksumSeed;
251	/** 0x274: Upper 8bits of the u32LastWrittenTime field. */
252	uint8_t u32LastWrittenTimeHigh8Bits;
253	/** 0x275: Upper 8bits of the u32LastMountTime field. */
254	uint8_t u32LastMountTimeHigh8Bits;
255	/** 0x276: Upper 8bits of the u32TimeFsCreation field. */
256	uint8_t u32TimeFsCreationHigh8Bits;
257	/** 0x277: Upper 8bits of the u32LastCheckTime field. */
258	uint8_t u32LastCheckTimeHigh8Bits;
259	/** 0x278: Upper 8bits of the u32TimeFirstError field. */
260	uint8_t u32TimeFirstErrorHigh8Bits;
261	/** 0x279: Upper 8bits of the u32TimeLastError field. */
262	uint8_t u32TimeLastErrorHigh8Bits;
263	/** 0x27a: Zero padding. */
264	uint8_t au8Padding[2];
265	/** 0x27c: Padding to the end of the block. */
266	uint32_t au32Rsvd[96];
267	/** 0x3fc: Superblock checksum. */
268	uint32_t u32Chksum;
269	} EXTSUPERBLOCK;
270	AssertCompileMemberOffset(EXTSUPERBLOCK, u16UidReservedBlocks, 0x50);
271	AssertCompileMemberOffset(EXTSUPERBLOCK, u32AlgoUsageBitmap, 0xc8);
272	AssertCompileMemberOffset(EXTSUPERBLOCK, iJournalInode, 0xe0);
273	AssertCompileMemberOffset(EXTSUPERBLOCK, u8HashVersionDef, 0xfc);
274	AssertCompileMemberOffset(EXTSUPERBLOCK, fMntOptsDef, 0x100);
275	AssertCompileMemberOffset(EXTSUPERBLOCK, iBlkLastError, 0x1d8);
276	AssertCompileMemberOffset(EXTSUPERBLOCK, iInodeLostFound, 0x268);
277	AssertCompileSize(EXTSUPERBLOCK, 1024);
278	/** Pointer to an ext super block. */
279	typedef EXTSUPERBLOCK *PEXTSUPERBLOCK;
280	/** Pointer to a const ext super block. */
281	typedef EXTSUPERBLOCK const *PCEXTSUPERBLOCK;
282
283	/** Ext signature. */
284	#define EXT_SB_SIGNATURE UINT16_C(0xef53)
285
286	/** @name EXT_SB_STATE_XXX - Filesystem state
287	* @{ */
288	/** Clean filesystem state. */
289	#define EXT_SB_STATE_CLEAN UINT16_C(0x0001)
290	/** Error filesystem state. */
291	#define EXT_SB_STATE_ERRORS UINT16_C(0x0002)
292	/** Orphans being recovered state. */
293	#define EXT_SB_STATE_ORPHANS_RECOVERING UINT16_C(0x0004)
294	/** @} */
295
296	/** @name EXT_SB_OS_ID_CREATOR_XXX - Filesystem creator
297	* @{ */
298	/** Linux. */
299	#define EXT_SB_OS_ID_CREATOR_LINUX 0
300	/** Hurd. */
301	#define EXT_SB_OS_ID_CREATOR_HURD 1
302	/** Masix. */
303	#define EXT_SB_OS_ID_CREATOR_MASIX 2
304	/** FreeBSD. */
305	#define EXT_SB_OS_ID_CREATOR_FREEBSD 3
306	/** Lites. */
307	#define EXT_SB_OS_ID_CREATOR_LITES 4
308	/** @} */
309
310	/** @name EXT_SB_REV_XXX - Superblock revision
311	* @{ */
312	/** Original format (ext2). */
313	#define EXT_SB_REV_ORIG 0
314	/** Inodes have dynmic sizes. */
315	#define EXT_SB_REV_V2_DYN_INODE_SZ 1
316	/** @} */
317
318	/** @name EXT_SB_FEAT_COMPAT_XXX - Compatible features which can be ignored when set
319	* and not being supported.
320	* @{ */
321	/** Directories can be preallocated. */
322	#define EXT_SB_FEAT_COMPAT_DIR_PREALLOC RT_BIT_32(0)
323	/** Some sort of "imagic" inodes. */
324	#define EXT_SB_FEAT_COMPAT_IMAGIC_INODES RT_BIT_32(1)
325	/** Filesystem has a journal. */
326	#define EXT_SB_FEAT_COMPAT_HAS_JOURNAL RT_BIT_32(2)
327	/** Filesystem supports extended attributes. */
328	#define EXT_SB_FEAT_COMPAT_EXT_ATTR RT_BIT_32(3)
329	/** Filesystem contains reserved group descriptor blocks for filesystem expansion. */
330	#define EXT_SB_FEAT_COMPAT_RESIZE_INODE RT_BIT_32(4)
331	/** Filesystem contains directory indices. */
332	#define EXT_SB_FEAT_COMPAT_DIR_INDEX RT_BIT_32(5)
333	/** Lazy block group - not used. */
334	#define EXT_SB_FEAT_COMPAT_LAZY_BG RT_BIT_32(6)
335	/** Exclude inode - not used. */
336	#define EXT_SB_FEAT_COMPAT_EXCLUDE_INODE RT_BIT_32(7)
337	/** Exclude bitmap - not used. */
338	#define EXT_SB_FEAT_COMPAT_EXCLUDE_BITMAP RT_BIT_32(8)
339	/** Sparse super blocks, super block contains pointers to block groups
340	* containing backups of the superblock. */
341	#define EXT_SB_FEAT_COMPAT_SPARSE_SUPER2 RT_BIT_32(9)
342	/** @} */
343
344	/** @name EXT_SB_FEAT_INCOMPAT_XXX - Incompatible features which cause a mounting
345	* error when set and not being supported.
346	* @{ */
347	/** Filesystem contains compressed files. */
348	#define EXT_SB_FEAT_INCOMPAT_COMPRESSION RT_BIT_32(0)
349	/** Directory entries contain a file type. */
350	#define EXT_SB_FEAT_INCOMPAT_DIR_FILETYPE RT_BIT_32(1)
351	/** Filesystem needs recovery. */
352	#define EXT_SB_FEAT_INCOMPAT_RECOVER RT_BIT_32(2)
353	/** The journal is recorded on a separate device. */
354	#define EXT_SB_FEAT_INCOMPAT_JOURNAL_DEV RT_BIT_32(3)
355	/** Filesystem uses meta block groups. */
356	#define EXT_SB_FEAT_INCOMPAT_META_BG RT_BIT_32(4)
357	/** Files in the filesystem use extents. */
358	#define EXT_SB_FEAT_INCOMPAT_EXTENTS RT_BIT_32(6)
359	/** Filesystem uses 64bit offsets. */
360	#define EXT_SB_FEAT_INCOMPAT_64BIT RT_BIT_32(7)
361	/** Filesystem requires multiple mount preotection. */
362	#define EXT_SB_FEAT_INCOMPAT_MMP RT_BIT_32(8)
363	/** Filesystem uses flexible block groups. */
364	#define EXT_SB_FEAT_INCOMPAT_FLEX_BG RT_BIT_32(9)
365	/** Inodes can be used to store large extended attribute values. */
366	#define EXT_SB_FEAT_INCOMPAT_EXT_ATTR_INODE RT_BIT_32(10)
367	/** Data is contained in directory entries. */
368	#define EXT_SB_FEAT_INCOMPAT_DIRDATA RT_BIT_32(12)
369	/** Metadata checksum seed is stored in the super block. */
370	#define EXT_SB_FEAT_INCOMPAT_CSUM_SEED RT_BIT_32(13)
371	/** Directories can be larger than 2GiB or contain a 3-level HTree. */
372	#define EXT_SB_FEAT_INCOMPAT_LARGE_DIR RT_BIT_32(14)
373	/** Data is inlined in the inode. */
374	#define EXT_SB_FEAT_INCOMPAT_INLINE_DATA RT_BIT_32(15)
375	/** Encrypted inodes are present on the filesystem. */
376	#define EXT_SB_FEAT_INCOMPAT_ENCRYPT RT_BIT_32(16)
377	/** @} */
378
379	/** @name EXT_SB_FEAT_COMPAT_RO_XXX - Backward compatible features when mounted readonly
380	* @{ */
381	/** Sparse superblocks. */
382	#define EXT_SB_FEAT_COMPAT_RO_SPARSE_SUPER RT_BIT_32(0)
383	/** There is at least one large file (> 2GiB). */
384	#define EXT_SB_FEAT_COMPAT_RO_LARGE_FILE RT_BIT_32(1)
385	/** Actually not used in the Linux kernel and e2fprogs. */
386	#define EXT_SB_FEAT_COMPAT_RO_BTREE_DIR RT_BIT_32(2)
387	/** Filesystem contains files which sizes are not represented as a multiple of 512 byte sectors
388	* but logical blocks instead. */
389	#define EXT_SB_FEAT_COMPAT_RO_HUGE_FILE RT_BIT_32(3)
390	/** Group descriptors have checksums embedded */
391	#define EXT_SB_FEAT_COMPAT_RO_GDT_CHSKUM RT_BIT_32(4)
392	/** Subdirectory limit of 32000 doesn't apply. The link count is set to 1 if beyond 64999. */
393	#define EXT_SB_FEAT_COMPAT_RO_DIR_NLINK RT_BIT_32(5)
394	/** Inodes can contain extra data. */
395	#define EXT_SB_FEAT_COMPAT_RO_EXTRA_INODE_SZ RT_BIT_32(6)
396	/** There is at least one snapshot on the filesystem. */
397	#define EXT_SB_FEAT_COMPAT_RO_HAS_SNAPSHOTS RT_BIT_32(7)
398	/** Quotas are enabled for this filesystem. */
399	#define EXT_SB_FEAT_COMPAT_RO_QUOTA RT_BIT_32(8)
400	/** The bigalloc feature is enabled, file extents are tracked in units of clusters
401	* instead of blocks. */
402	#define EXT_SB_FEAT_COMPAT_RO_BIGALLOC RT_BIT_32(9)
403	/** Metadata contains checksums. */
404	#define EXT_SB_FEAT_COMPAT_RO_METADATA_CHKSUM RT_BIT_32(10)
405	/** Filesystem supports replicas. */
406	#define EXT_SB_FEAT_COMPAT_RO_REPLICA RT_BIT_32(11)
407	/** Filesystem is readonly. */
408	#define EXT_SB_FEAT_COMPAT_RO_READONLY RT_BIT_32(12)
409	/** Filesystem tracks project quotas. */
410	#define EXT_SB_FEAT_COMPAT_RO_PROJECT RT_BIT_32(13)
411	/** @} */
412
413	/** @name EXT_SB_HASH_VERSION_DEF_XXX - Default hash algorithm used
414	* @{ */
415	/** Legacy. */
416	#define EXT_SB_HASH_VERSION_DEF_LEGACY 0
417	/** Half MD4. */
418	#define EXT_SB_HASH_VERSION_DEF_HALF_MD4 1
419	/** Tea. */
420	#define EXT_SB_HASH_VERSION_DEF_TEA 2
421	/** Unsigned legacy. */
422	#define EXT_SB_HASH_VERSION_DEF_LEGACY_UNSIGNED 3
423	/** Unsigned half MD4. */
424	#define EXT_SB_HASH_VERSION_DEF_HALF_MD4_UNSIGNED 4
425	/** Unsigned tea. */
426	#define EXT_SB_HASH_VERSION_DEF_TEA_UNSIGNED 5
427	/** @} */
428
429	/** @name EXT_SB_MNT_OPTS_DEF_XXX - Default mount options
430	* @{ */
431	/** Print debugging information on (re)mount. */
432	#define EXT_SB_MNT_OPTS_DEF_DEBUG RT_BIT_32(0)
433	/** Created files take the group ID ofthe containing directory. */
434	#define EXT_SB_MNT_OPTS_DEF_BSDGROUPS RT_BIT_32(1)
435	/** Support userspace extended attributes. */
436	#define EXT_SB_MNT_OPTS_DEF_XATTR_USER RT_BIT_32(2)
437	/** Support POSIX access control lists. */
438	#define EXT_SB_MNT_OPTS_DEF_ACL RT_BIT_32(3)
439	/** Do not support 32bit UIDs. */
440	#define EXT_SB_MNT_OPTS_DEF_UID16 RT_BIT_32(4)
441	/** All data and metadata are committed to the journal. */
442	#define EXT_SB_MNT_OPTS_DEF_JMODE_DATA RT_BIT_32(5)
443	/** All data are flushed to the disk before metadata are committed to the journal. */
444	#define EXT_SB_MNT_OPTS_DEF_JMODE_ORDERED RT_BIT_32(6)
445	/** Data ordering not preserved, data may be written after metadata has been written. */
446	#define EXT_SB_MNT_OPTS_DEF_JMODE_WBACK (EXT_SB_MNT_OPTS_DEF_JMODE_DATA \| EXT_SB_MNT_OPTS_DEF_JMODE_ORDERED)
447	/** No write flushes. */
448	#define EXT_SB_MNT_OPTS_DEF_NOBARRIER RT_BIT_32(8)
449	/** Track metadata blocks on the filesystem not being used as data blocks. */
450	#define EXT_SB_MNT_OPTS_DEF_BLOCK_VALIDITY RT_BIT_32(9)
451	/** Enables TRIM/DISCARD support. */
452	#define EXT_SB_MNT_OPTS_DEF_DISCARD RT_BIT_32(10)
453	/** Disable delayed allocation. */
454	#define EXT_SB_MNT_OPTS_DEF_NODELALLOC RT_BIT_32(11)
455	/** @} */
456
457	/** @name EXT_SB_F_XXX - Superblock flags
458	* @{ */
459	/** Signed directory hash used. */
460	#define EXT_SB_F_SIGNED_DIR_HASH RT_BIT_32(0)
461	/** Unsigned directory hash used. */
462	#define EXT_SB_F_UNSIGNED_DIR_HASH RT_BIT_32(1)
463	/** Only used to test development code. */
464	#define EXT_SB_F_DEV_CODE RT_BIT_32(3)
465	/** @} */
466
467	/** @name EXT_SB_ENCRYPT_ALGO_XXX - Group descriptor flags
468	* @{ */
469	/** Invalid encryption algorithm. */
470	#define EXT_SB_ENCRYPT_ALGO_INVALID 0
471	/** 256-bit AES in XTS mode. */
472	#define EXT_SB_ENCRYPT_ALGO_256BIT_AES_XTS 1
473	/** 256-bit AES in GCM mode. */
474	#define EXT_SB_ENCRYPT_ALGO_256BIT_AES_GCM 2
475	/** 256-bit AES in CBC mode. */
476	#define EXT_SB_ENCRYPT_ALGO_256BIT_AES_CBC 3
477	/** @} */
478
479
480	/**
481	* Block group descriptor (32byte version).
482	*/
483	typedef struct EXTBLOCKGROUPDESC32
484	{
485	/** 0x00: Block address of the block bitmap (low 32bits). */
486	uint32_t offBlockBitmapLow;
487	/** 0x04: Block address of the inode bitmap (low 32bits). */
488	uint32_t offInodeBitmapLow;
489	/** 0x08: Start block address of the inode table (low 32bits). */
490	uint32_t offInodeTableLow;
491	/** 0x0c: Number of unallocated blocks in group (low 16bits). */
492	uint16_t cBlocksFreeLow;
493	/** 0x0e: Number of unallocated inodes in group (low 16bits). */
494	uint16_t cInodesFreeLow;
495	/** 0x10: Number of directories in the group (low 16bits). */
496	uint16_t cDirectoriesLow;
497	/** 0x12: Flags (EXT_GROUP_DESC_F_XXX). */
498	uint16_t fFlags;
499	/** 0x14: Location of snapshot exclusion bitmap (lower 32bits) */
500	uint32_t offSnapshotExclBitmapLow;
501	/** 0x18: Block bitmap checksum (lower 16bits). */
502	uint16_t u16ChksumBlockBitmapLow;
503	/** 0x1a: Inode bitmap checksum (lower 16bits). */
504	uint16_t u16ChksumInodeBitmapLow;
505	/** 0x1c: Unused inode entry count in the groups inode table (lower 16bits).*/
506	uint16_t cInodeTblUnusedLow;
507	/** 0x1e: Group descriptor checksum. */
508	uint16_t u16Chksum;
509	} EXTBLOCKGROUPDESC32;
510	AssertCompileSize(EXTBLOCKGROUPDESC32, 32);
511	/** Pointer to an ext block group descriptor. */
512	typedef EXTBLOCKGROUPDESC32 *PEXTBLOCKGROUPDESC32;
513	/** Pointer to a const 32 byte block group descriptor. */
514	typedef const EXTBLOCKGROUPDESC32 *PCEXTBLOCKGROUPDESC32;
515
516
517	/**
518	* Block group descriptor (64byte version).
519	*/
520	typedef struct EXTBLOCKGROUPDESC64
521	{
522	/** 0x00: Embedded 32 byte descriptor. */
523	EXTBLOCKGROUPDESC32 v32;
524	/** 0x20: Location of block bitmap (upper 32bits). */
525	uint32_t offBlockBitmapHigh;
526	/** 0x24: Location of inode bitmap (upper 32bits). */
527	uint32_t offInodeBitmapHigh;
528	/** 0x28: Location of inode table (upper 32bits). */
529	uint32_t offInodeTableHigh;
530	/** 0x2c: Number of unallocated blocks (upper 16bits). */
531	uint16_t cBlocksFreeHigh;
532	/** 0x2e: Number of unallocated inodes (upper 16bits). */
533	uint16_t cInodesFreeHigh;
534	/** 0x30: Number of directories in the group (upper 16bits). */
535	uint16_t cDirectoriesHigh;
536	/** 0x32: Unused inode entry count in the groups inode table (upper 16bits).*/
537	uint16_t cInodeTblUnusedHigh;
538	/** 0x34: Location of snapshot exclusion bitmap (upper 32bits) */
539	uint32_t offSnapshotExclBitmapHigh;
540	/** 0x38: Block bitmap checksum (upper 16bits). */
541	uint16_t u16ChksumBlockBitmapHigh;
542	/** 0x3a: Inode bitmap checksum (upper 16bits). */
543	uint16_t u16ChksumInodeBitmapHigh;
544	/** 0x3c: Padding to 64 bytes. */
545	uint32_t u64Padding;
546	} EXTBLOCKGROUPDESC64;
547	AssertCompileSize(EXTBLOCKGROUPDESC64, 64);
548	/** Pointer to an ext block group descriptor. */
549	typedef EXTBLOCKGROUPDESC64 *PEXTBLOCKGROUPDESC64;
550	/** Pointer to a const 64 byte block group descriptor. */
551	typedef const EXTBLOCKGROUPDESC64 *PCEXTBLOCKGROUPDESC64;
552
553	/** @name EXT_GROUP_DESC_F_XXX - Group descriptor flags
554	* @{ */
555	/** Inode table and bitmaps are not initialized. */
556	#define EXT_GROUP_DESC_F_INODE_UNINIT RT_BIT(0)
557	/** Block bitmap is not initialized. */
558	#define EXT_GROUP_DESC_F_BLOCK_UNINIT RT_BIT(1)
559	/** Inode table is zeroed. */
560	#define EXT_GROUP_DESC_F_INODE_ZEROED RT_BIT(2)
561	/** @} */
562
563
564	/**
565	* Combiend view of the different block gorup descriptor versions.
566	*/
567	typedef union EXTBLOCKGROUPDESC
568	{
569	/** 32 byte version. */
570	EXTBLOCKGROUPDESC32 v32;
571	/** 64 byte version. */
572	EXTBLOCKGROUPDESC64 v64;
573	/** Byte view. */
574	uint8_t au8[64];
575	} EXTBLOCKGROUPDESC;
576	/** Poiner to a unified block gorup descriptor view. */
577	typedef EXTBLOCKGROUPDESC *PEXTBLOCKGROUPDESC;
578	/** Poiner to a const unified block gorup descriptor view. */
579	typedef const EXTBLOCKGROUPDESC *PCEXTBLOCKGROUPDESC;
580
581
582	/** Number of block entries in the inodes block map. */
583	#define EXT_INODE_BLOCK_ENTRIES 15
584
585	/**
586	* Inode table entry (standard 128 byte version).
587	*/
588	typedef struct EXTINODE
589	{
590	/** 0x00: File mode (EXT_INODE_FILE_MODE_XXX). */
591	uint16_t fMode;
592	/** 0x02: Owner UID (lower 16bits). */
593	uint16_t uUidLow;
594	/** 0x04: Size in bytes (lower 32bits). */
595	uint32_t cbSizeLow;
596	/** 0x08: Last access time in seconds since epoch. */
597	uint32_t u32TimeLastAccess;
598	/** 0x0c: Last inode change time in seconds since epoch. */
599	uint32_t u32TimeLastChange;
600	/** 0x10: Last data modification time in seconds since epoch. */
601	uint32_t u32TimeLastModification;
602	/** 0x14: Deletion time in seconds since epoch. */
603	uint32_t u32TimeDeletion;
604	/** 0x18: Group ID (lower 16bits). */
605	uint16_t uGidLow;
606	/** 0x1a: Hard link count. */
607	uint16_t cHardLinks;
608	/** 0x1c: Block count (lower 32bits). */
609	uint32_t cBlocksLow;
610	/** 0x20: Inode flags. */
611	uint32_t fFlags;
612	/** 0x24: Operating system dependent data. */
613	union
614	{
615	/** Linux: Inode version. */
616	uint32_t u32LnxVersion;
617	} Osd1;
618	/** 0x28: Block map or extent tree. */
619	uint32_t au32Block[EXT_INODE_BLOCK_ENTRIES];
620	/** 0x64: File version. */
621	uint32_t u32Version;
622	/** 0x68: Extended attribute control block (lower 32bits). */
623	uint32_t offExtAttrLow;
624	/** 0x6c: File/directory size (upper 32bits). */
625	uint32_t cbSizeHigh;
626	/** 0x70: Fragment address (obsolete). */
627	uint32_t u32FragmentAddrObs;
628	/** 0x74: Operating system dependent data 2. */
629	union
630	{
631	/** Linux related data. */
632	struct
633	{
634	/** 0x00: Block count (upper 16bits). */
635	uint16_t cBlocksHigh;
636	/** 0x02: Extended attribute block location (upper 16bits). */
637	uint16_t offExtAttrHigh;
638	/** 0x04: Owner UID (upper 16bits). */
639	uint16_t uUidHigh;
640	/** 0x06: Group ID (upper 16bits). */
641	uint16_t uGidHigh;
642	/** 0x08: Inode checksum (lower 16bits). */
643	uint16_t u16ChksumLow;
644	/** 0x0a: Reserved */
645	uint16_t u16Rsvd;
646	} Lnx;
647	} Osd2;
648	} EXTINODE;
649	AssertCompileSize(EXTINODE, 128);
650	/** Pointer to an inode. */
651	typedef EXTINODE *PEXTINODE;
652	/** Pointer to a const inode. */
653	typedef const EXTINODE *PCEXTINODE;
654
655
656	/**
657	* Extra inode data (coming right behind the fixed inode data).
658	*/
659	typedef struct EXTINODEEXTRA
660	{
661	/** 0x80: Size of the extra inode data in bytes. */
662	uint16_t cbInodeExtra;
663	/** 0x82: Inode checksum (upper 16bits.) */
664	uint16_t u16ChksumHigh;
665	/** 0x84: Last inode change time, extra time bits for sub-second precision. */
666	uint32_t u32ExtraTimeLastChange;
667	/** 0x88: Last data modification time, extra time bits for sub-second precision. */
668	uint32_t u32ExtraTimeLastModification;
669	/** 0x8c: Last access time, extra time bits for sub-second precision. */
670	uint32_t u32ExtraTimeLastAccess;
671	/** 0x90: File creation time in seconds since epoch. */
672	uint32_t u32TimeCreation;
673	/** 0x94: File creation time, extra time bits for sub-second precision. */
674	uint32_t u32ExtraTimeCreation;
675	/** 0x98: Version number (upper 32bits). */
676	uint32_t u32VersionHigh;
677	/** 0x9c: Project ID. */
678	uint32_t u32ProjectId;
679	} EXTINODEEXTRA;
680	/** Pointer to extra inode data. */
681	typedef EXTINODEEXTRA *PEXTINODEEXTRA;
682	/** Pointer to a const extra inode data. */
683	typedef const EXTINODEEXTRA *PCEXTINODEEXTRA;
684
685
686	/**
687	* Combined inode data.
688	*/
689	typedef struct EXTINODECOMB
690	{
691	/** Core inode structure. */
692	EXTINODE Core;
693	/** Any extra inode data which might be present. */
694	EXTINODEEXTRA Extra;
695	} EXTINODECOMB;
696	/** Pointer to combined inode data. */
697	typedef EXTINODECOMB *PEXTINODECOMB;
698	/** Pointer to a const combined inode data. */
699	typedef const EXTINODECOMB *PCEXTINODECOMB;
700
701
702
703	/** @name EXT_INODE_MODE_XXX - File mode
704	* @{ */
705	/** Others can execute the file. */
706	#define EXT_INODE_MODE_EXEC_OTHER RT_BIT(0)
707	/** Others can write to the file. */
708	#define EXT_INODE_MODE_WRITE_OTHER RT_BIT(1)
709	/** Others can read the file. */
710	#define EXT_INODE_MODE_READ_OTHER RT_BIT(2)
711	/** Members of the same group can execute the file. */
712	#define EXT_INODE_MODE_EXEC_GROUP RT_BIT(3)
713	/** Members of the same group can write to the file. */
714	#define EXT_INODE_MODE_WRITE_GROUP RT_BIT(4)
715	/** Members of the same group can read the file. */
716	#define EXT_INODE_MODE_READ_GROUP RT_BIT(5)
717	/** Owner can execute the file. */
718	#define EXT_INODE_MODE_EXEC_OWNER RT_BIT(6)
719	/** Owner can write to the file. */
720	#define EXT_INODE_MODE_WRITE_OWNER RT_BIT(7)
721	/** Owner can read the file. */
722	#define EXT_INODE_MODE_READ_OWNER RT_BIT(8)
723	/** Sticky file mode. */
724	#define EXT_INODE_MODE_STICKY RT_BIT(9)
725	/** File is set GID. */
726	#define EXT_INODE_MODE_SET_GROUP_ID RT_BIT(10)
727	/** File is set UID. */
728	#define EXT_INODE_MODE_SET_USER_ID RT_BIT(11)
729	/** @} */
730
731	/** @name EXT_INODE_MODE_TYPE_XXX - File type
732	* @{ */
733	/** Inode represents a FIFO. */
734	#define EXT_INODE_MODE_TYPE_FIFO UINT16_C(0x1000)
735	/** Inode represents a character device. */
736	#define EXT_INODE_MODE_TYPE_CHAR UINT16_C(0x2000)
737	/** Inode represents a directory. */
738	#define EXT_INODE_MODE_TYPE_DIR UINT16_C(0x4000)
739	/** Inode represents a block device. */
740	#define EXT_INODE_MODE_TYPE_BLOCK UINT16_C(0x6000)
741	/** Inode represents a regular file. */
742	#define EXT_INODE_MODE_TYPE_REGULAR UINT16_C(0x8000)
743	/** Inode represents a symlink. */
744	#define EXT_INODE_MODE_TYPE_SYMLINK UINT16_C(0xa000)
745	/** Inode represents a socket. */
746	#define EXT_INODE_MODE_TYPE_SOCKET UINT16_C(0xc000)
747	/** Returns the inode type from the combined mode field. */
748	#define EXT_INODE_MODE_TYPE_GET_TYPE(a_Mode) ((a_Mode) & 0xf000)
749	/** @} */
750
751	/** @name EXT_INODE_F_XXX - Inode flags
752	* @{ */
753	/** Inode requires secure erase on deletion. */
754	#define EXT_INODE_F_SECURE_ERASE RT_BIT_32(0)
755	/** Inode should be preserved for undeletion during deletion. */
756	#define EXT_INODE_F_UNDELETE RT_BIT_32(1)
757	/** Inode contains compressed data. */
758	#define EXT_INODE_F_COMPRESSED RT_BIT_32(2)
759	/** All writes to this inode must be synchronous. */
760	#define EXT_INODE_F_SYNCHRONOUS RT_BIT_32(3)
761	/** Inode is immutable. */
762	#define EXT_INODE_F_IMMUTABLE RT_BIT_32(4)
763	/** Inode is append only. */
764	#define EXT_INODE_F_APPEND_ONLY RT_BIT_32(5)
765	/** Inode should not be dumped via dump(1). */
766	#define EXT_INODE_F_NO_DUMP RT_BIT_32(6)
767	/** Access time is not updated. */
768	#define EXT_INODE_F_NO_ACCESS_TIME RT_BIT_32(7)
769	/** Dirty compressed file. */
770	#define EXT_INODE_F_DIRTY_COMPRESSED RT_BIT_32(8)
771	/** Inode has one or more compressed clusters. */
772	#define EXT_INODE_F_COMPRESSED_BLOCK RT_BIT_32(9)
773	/** Inode should not be compressed. */
774	#define EXT_INODE_F_NO_COMPRESSION RT_BIT_32(10)
775	/** Inode is encrypted. */
776	#define EXT_INODE_F_ENCRYPTED RT_BIT_32(11)
777	/** Directory has hashed indexes. */
778	#define EXT_INODE_F_DIR_HASHED_INDEX RT_BIT_32(12)
779	/** AFS magic directory. */
780	#define EXT_INODE_F_IMAGIC RT_BIT_32(13)
781	/** Data must always be written through the journal. */
782	#define EXT_INODE_F_JOURNAL_DATA RT_BIT_32(14)
783	/** File tail should not be merged. */
784	#define EXT_INODE_F_NOTAIL RT_BIT_32(15)
785	/** All directory entry data should be written synchronously. */
786	#define EXT_INODE_F_DIR_SYNCHRONOUS RT_BIT_32(16)
787	/** Top of directory hierarchy. */
788	#define EXT_INODE_F_TOP_DIRECTORY RT_BIT_32(17)
789	/** Inode is a huge file. */
790	#define EXT_INODE_F_HUGE_FILE RT_BIT_32(18)
791	/** Inode uses extents. */
792	#define EXT_INODE_F_EXTENTS RT_BIT_32(19)
793	/** Inode stores a large extended attribute value in its data blocks. */
794	#define EXT_INODE_F_EXT_ATTR_INODE RT_BIT_32(20)
795	/** File has blocks allocated past end of file. */
796	#define EXT_INODE_F_ALLOC_BLOCKS_EOF RT_BIT_32(21)
797	/** Inode is a snapshot. */
798	#define EXT_INODE_F_SNAPSHOT RT_BIT_32(22)
799	/** Snapshot is being deleted. */
800	#define EXT_INODE_F_SNAPSHOT_DELETED RT_BIT_32(23)
801	/** Snapshot shrink has completed. */
802	#define EXT_INODE_F_SNAPSHOT_SHRUNK RT_BIT_32(24)
803	/** Inode contains inline data. */
804	#define EXT_INODE_F_INLINE_DATA RT_BIT_32(25)
805	/** Children are created with the same project ID. */
806	#define EXT_INODE_F_PROJECT_ID_INHERIT RT_BIT_32(26)
807	/** Reserved for ext4 library. */
808	#define EXT_INODE_F_RESERVED_LIBRARY RT_BIT_32(27)
809	/** @} */
810
811
812	/**
813	* Extent tree header.
814	*/
815	typedef struct EXTEXTENTHDR
816	{
817	/** 0x00: Magic number for identification. */
818	uint16_t u16Magic;
819	/** 0x02: Number of valid entries following. */
820	uint16_t cEntries;
821	/** 0x04: Maxmimum number of entries that could follow. */
822	uint16_t cMax;
823	/** 0x06: Depth of this extent node in the tree. */
824	uint16_t uDepth;
825	/** 0x08: Generation of the tree (not used by standard ext4). */
826	uint32_t cGeneration;
827	} EXTEXTENTHDR;
828	AssertCompileSize(EXTEXTENTHDR, 12);
829	/** Pointer to a extent tree header. */
830	typedef EXTEXTENTHDR *PEXTEXTENTHDR;
831	/** Pointer to a const extent tree header. */
832	typedef const EXTEXTENTHDR *PCEXTEXTENTHDR;
833
834	/** Magic number identifying an extent header. */
835	#define EXT_EXTENT_HDR_MAGIC UINT16_C(0xf30a)
836	/** Maximum depth an extent header can have. */
837	#define EXT_EXTENT_HDR_DEPTH_MAX UINT16_C(5)
838
839
840	/**
841	* Extent tree index node.
842	*/
843	typedef struct EXTEXTENTIDX
844	{
845	/** 0x00: Start file block this node covers. */
846	uint32_t iBlock;
847	/** 0x04: Block number of child extent node (lower 32bits). */
848	uint32_t offChildLow;
849	/** 0x08: Block number of child extent node (upper 16bits). */
850	uint16_t offChildHigh;
851	/** 0x0a: Reserved. */
852	uint16_t u16Rsvd;
853	} EXTEXTENTIDX;
854	AssertCompileSize(EXTEXTENTIDX, 12);
855	/** Pointer to an extent tree index node. */
856	typedef EXTEXTENTIDX *PEXTEXTENTIDX;
857	/** Pointer to a const extent tree index node. */
858	typedef const EXTEXTENTIDX *PCEXTEXTENTIDX;
859
860
861	/**
862	* Extent tree leaf node.
863	*/
864	typedef struct EXTEXTENT
865	{
866	/** 0x00: First file block number this extent covers. */
867	uint32_t iBlock;
868	/** 0x04: Number of blocks covered by this extent. */
869	uint16_t cBlocks;
870	/** 0x06: Block number this extent points to (upper 32bits). */
871	uint16_t offStartHigh;
872	/** 0x08: Block number this extent points to (lower 32bits). */
873	uint32_t offStartLow;
874	} EXTEXTENT;
875	AssertCompileSize(EXTEXTENT, 12);
876	/** Pointer to a leaf node. */
877	typedef EXTEXTENT *PEXTEXTENT;
878	/** Pointer to a const leaf node. */
879	typedef const EXTEXTENT *PCEXTEXTENT;
880
881	/** Length field limit for a populated extent, fields greater than that limit indicate a sparse extent. */
882	#define EXT_EXTENT_LENGTH_LIMIT UINT16_C(32768)
883
884
885	/**
886	* Directory entry.
887	*/
888	typedef struct EXTDIRENTRY
889	{
890	/** 0x00: Inode number being referenced by this entry. */
891	uint32_t iInodeRef;
892	/** 0x04: Record length of this directory entry in bytes (multiple of 4). */
893	uint16_t cbRecord;
894	/** 0x06: Version dependent data. */
895	union
896	{
897	/** Original. */
898	struct
899	{
900	/** Name length in bytes (maximum 255). */
901	uint16_t cbName;
902	} v1;
903	/** Version 2. */
904	struct
905	{
906	/** Name length in bytes (maximum 255). */
907	uint8_t cbName;
908	/** File type (EXT_DIRENTRY_TYPE_XXX). */
909	uint8_t uType;
910	} v2;
911	} u;
912	/** 0x08: File name - variable in size. */
913	char achName[1];
914	} EXTDIRENTRY;
915	/** Pointer to a directory entry. */
916	typedef EXTDIRENTRY *PEXTDIRENTRY;
917	/** Poiner to a const directory entry. */
918	typedef const EXTDIRENTRY *PCEXTDIRENTRY;
919
920
921	/**
922	* Extended directory entry with the maximum size (263 bytes).
923	*/
924	#pragma pack(1)
925	typedef union EXTDIRENTRYEX
926	{
927	/** The directory entry. */
928	EXTDIRENTRY Core;
929	/** The byte view. */
930	uint8_t au8[263];
931	} EXTDIRENTRYEX;
932	#pragma pack()
933	AssertCompileSize(EXTDIRENTRYEX, 263);
934	/** Pointer to an extended directory entry. */
935	typedef EXTDIRENTRYEX *PEXTDIRENTRYEX;
936	/** Pointer to a const extended directory entry. */
937	typedef const EXTDIRENTRYEX *PCEXTDIRENTRYEX;
938
939
940	/** @name EXT_DIRENTRY_TYPE_XXX - file type
941	* @{ */
942	/** Entry is of unknown file type. */
943	#define EXT_DIRENTRY_TYPE_UNKNOWN 0
944	/** Entry is regular file. */
945	#define EXT_DIRENTRY_TYPE_REGULAR 1
946	/** Entry is another directory. */
947	#define EXT_DIRENTRY_TYPE_DIRECTORY 2
948	/** Entry is a character device. */
949	#define EXT_DIRENTRY_TYPE_CHAR 3
950	/** Entry is a block device. */
951	#define EXT_DIRENTRY_TYPE_BLOCK 4
952	/** Entry is a FIFO. */
953	#define EXT_DIRENTRY_TYPE_FIFO 5
954	/** Entry is a socket. */
955	#define EXT_DIRENTRY_TYPE_SOCKET 6
956	/** Entry is a symlink. */
957	#define EXT_DIRENTRY_TYPE_SYMLINK 7
958	/** Entry is a checksum and uses EXTDIRENTRYCHKSUM. */
959	#define EXT_DIRENTRY_TYPE_CHKSUM 0xde
960	/** @} */
961
962
963	/**
964	* Tail directory entry (for checksumming).
965	*/
966	typedef struct EXTDIRENTRYCHKSUM
967	{
968	/** 0x00: Reserved, must be 0 (overlays with EXTDIRENTRY::iNodeRef). */
969	uint32_t u32Rsvd;
970	/** 0x04: Record length (must be 12). */
971	uint16_t cbRecord;
972	/** 0x06: Reserved (overlays with EXTDIRENTRY::u::v1::cbName). */
973	uint8_t u8Rsvd;
974	/** 0x07: File type (must be 0xde). */
975	uint8_t uType;
976	/** 0x08: Checksum. */
977	uint32_t u32Chksum;
978	} EXTDIRENTRYCHKSUM;
979	/** Pointer to a tail directory entry. */
980	typedef EXTDIRENTRYCHKSUM *PEXTDIRENTRYCHKSUM;
981	/** Pointer to const tail directory entry. */
982	typedef const EXTDIRENTRYCHKSUM *PCEXTDIRENTRYCHKSUM;
983
984
985	/** @} */
986
987	#endif /* !IPRT_INCLUDED_formats_ext_h */
988

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