xfs.h@ 105688

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1	/* $Id: xfs.h 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	* IPRT, XFS format.
4	*/
5
6	/*
7	* Copyright (C) 2018-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37	#ifndef IPRT_INCLUDED_formats_xfs_h
38	#define IPRT_INCLUDED_formats_xfs_h
39	#ifndef RT_WITHOUT_PRAGMA_ONCE
40	# pragma once
41	#endif
42
43	#include <iprt/types.h>
44	#include <iprt/assertcompile.h>
45
46
47	/** @defgroup grp_rt_formats_xfs XFS filesystem structures and definitions
48	* @ingroup grp_rt_formats
49	* @{
50	*/
51
52	/*
53	* The filesystem structures were retrieved from:
54	* http://xfs.org/docs/xfsdocs-xml-dev/XFS_Filesystem_Structure//tmp/en-US/html/index.html and
55	* https://elixir.bootlin.com/linux/v4.9/source/fs/xfs/libxfs/xfs_format.h and
56	* https://righteousit.wordpress.com/
57	*/
58
59	/** XFS superblock offset from the beginning of the volume, this is constant. */
60	#define XFS_SB_OFFSET UINT64_C(0)
61
62	/** @name Common XFS types as defined in the spec.
63	* @{ */
64	/** Unsigned 64 bit absolute inode number. */
65	typedef uint64_t XFSINO;
66	/** Signed 64 bit file offset. */
67	typedef int64_t XFSFOFF;
68	/** Signed 64 bit disk address. */
69	typedef int64_t XFSDADDR;
70	/** Unsinged 32 bit allocation group (AG) number. */
71	typedef uint32_t XFSAGNUMBER;
72	/** Unsigned 32 bit AG relative block number. */
73	typedef uint32_t XFSAGBLOCK;
74	/** Unsigned 32 bit extent length in blocks. */
75	typedef uint32_t XFSEXTLEN;
76	/** Signed 32 bit number of extents in a file. */
77	typedef int32_t XFSEXTNUM;
78	/** Unsigned 32 bit block number for directories and extended attributes. */
79	typedef uint32_t XFSDABLK;
80	/** Unsigned 32 bit hash of a directory file name or extended attribute name. */
81	typedef uint32_t XFSDAHASH;
82	/** Unsigned 64 bit filesystem block number combining AG number and block offset into the AG. */
83	typedef uint64_t XFSDFSBNO;
84	/** Unsigned 64 bit raw filesystem block number. */
85	typedef uint64_t XFSDRFSBNO;
86	/** Unsigned 64 bit extent number in the real-time device. */
87	typedef uint64_t XFSDRTBNO;
88	/** Unsigned 64 bit block offset int oa file. */
89	typedef uint64_t XFSDFILOFF;
90	/** Unsigned 64 bit block count for a file. */
91	typedef uint64_t XFSDFILBLKS;
92	/** @} */
93
94	/**
95	* XFS superblock.
96	*/
97	#pragma pack(1)
98	typedef struct XFSSUPERBLOCK
99	{
100	/** 0x00: Magic number to identify the superblock. */
101	uint32_t u32Magic;
102	/** 0x04: Size of smallest allocation unit in bytes. */
103	uint32_t cbBlock;
104	/** 0x04: Number of blocks available for data and metadata. */
105	XFSDRFSBNO cBlocks;
106	/** 0x0c: Number of block in the real-time device. */
107	XFSDRFSBNO cBlocksRtDev;
108	/** 0x14: Number of extents on real-time device. */
109	XFSDRTBNO cExtentsRtDev;
110	/** 0x1c: UUID of the filesystem. */
111	uint8_t abUuid[16];
112	/** 0x2c: First block of the filesystem journal. */
113	XFSDFSBNO uBlockJournal;
114	/** 0x34: Inode number of the root directory. */
115	XFSINO uInodeRoot;
116	/** Inode for the real-time extent bitmap. */
117	XFSINO uInodeBitmapRtExt;
118	/** Inode for the real-time bitmap summary. */
119	XFSINO uInodeBitmapSummary;
120	/** Extent size on the real-time device in blocks. */
121	XFSAGBLOCK cRtExtent;
122	/** Size of an AG in blocks. */
123	XFSAGBLOCK cAgBlocks;
124	/** Number of AGs in hte filesystem. */
125	XFSAGNUMBER cAg;
126	/** Number of real-time bitmap blocks. */
127	XFSEXTLEN cRtBitmapBlocks;
128	/** Number of blocks for the journal. */
129	XFSEXTLEN cJournalBlocks;
130	/** Version number (actually flag bitmaps of features). */
131	uint16_t fVersion;
132	/** Sector size of the underlying medium. */
133	uint16_t cbSector;
134	/** Size of an inode in bytes. */
135	uint16_t cbInode;
136	/** Number of inodes stored in one block. */
137	uint16_t cInodesPerBlock;
138	/** Name of the filesystem. */
139	char achFsName[12];
140	/** Block size as log2 (number of bits to shift left). */
141	uint8_t cBlockSzLog;
142	/** Sector size as log2 (number of bits to shift left). */
143	uint8_t cSectorSzLog;
144	/** Inode size as log2 (number of bits to shift left). */
145	uint8_t cInodeSzLog;
146	/** Number of inodes per block as log2. */
147	uint8_t cInodesPerBlockLog;
148	/** Number of AG blocks as log2 (number of bits to shift left). */
149	uint8_t cAgBlocksLog;
150	/** Number of extent blocks as log2. */
151	uint8_t cExtentsRtDevLog;
152	/** Flag when the filesystem is in the process of being created. */
153	uint8_t fInProgress;
154	/** Maximum percentage of the filesystem usable for inodes. */
155	uint8_t cInodeMaxPct;
156	/** Global number of inodes allocated (only mainted on the first superblock). */
157	uint64_t cInodesGlobal;
158	/** Global number of free inodes (only mainted on the first superblock). */
159	uint64_t cInodesGlobalFree;
160	/** Global count of free data blocks on the filesystem (only mainted on the first superblock). */
161	uint64_t cBlocksFree;
162	/** Global count of free extents on the real-time device (only mainted on the first superblock). */
163	uint64_t cExtentsRtFree;
164	/** Inode containing the user quotas. */
165	XFSINO uInodeQuotaUsr;
166	/** Inode containing the group/project quotas. */
167	XFSINO uInodeQuotaGrp;
168	/** Quota flags. */
169	uint16_t fQuotaFlags;
170	/** Misc flags. */
171	uint8_t fFlagsMisc;
172	/** Reserved MBZ. */
173	uint8_t uSharedVn;
174	/** Number of filesystem blocks for the inode chunk alignment. */
175	XFSEXTLEN cBlocksInodeAlignment;
176	/** Raid stripe size in blocks. */
177	uint32_t cBlocksRaidStripe;
178	/** Raid width in number of blocks. */
179	uint32_t cBlocksRaidWidth;
180	/** Multiplier for determining the allocation size for directory blocks as log2. */
181	uint8_t cDirBlockAllocLog;
182	/** Sub volume sector size as log2 if an external journal device is used. */
183	uint8_t cLogDevSubVolSectorSzLog;
184	/** Sector size of the device an external journal is stored as log2. */
185	uint16_t cLogDevSectorSzLog;
186	/** Log devices stripe size. */
187	uint32_t cLogDevRaidStripe;
188	/** Additional features which may be active. */
189	uint32_t fFeatures2;
190	/** Padding. */
191	uint32_t u32Padding0;
192	/** From here follow data only available from version 5 and later. */
193	/** Read/Write feature flags. */
194	uint32_t fFeaturesRw;
195	/** Read-only feature flags. */
196	uint32_t fFeaturesRo;
197	/** Read/Write incompatible feature flags. */
198	uint32_t fFeaturesIncompatRw;
199	/** Read/Write incompatible feature flags for the journal. */
200	uint32_t fFeaturesJrnlIncompatRw;
201	/** CRC32 checksum for the superblock. */
202	uint32_t u32Chksum;
203	/** Sparse inode alignment. */
204	uint32_t u32SparseInodeAlignment;
205	/** Project quota inode. */
206	XFSINO uInodeProjectQuota;
207	/** Log sequence number of last superblock update. */
208	uint64_t uJrnlSeqSbUpdate;
209	/** UUID used when INCOMPAT_META_UUID is used. */
210	uint8_t abUuidMeta[16];
211	/** Inode if INCOMPATMETA_RMAPBT is used. */
212	XFSINO uInodeRm;
213	} XFSSUPERBLOCK;
214	#pragma pack()
215	AssertCompileSize(XFSSUPERBLOCK, 272);
216	/** Pointer to an XFS superblock. */
217	typedef XFSSUPERBLOCK *PXFSSUPERBLOCK;
218	/** Pointer to a const XFS superblock. */
219	typedef const XFSSUPERBLOCK *PCXFSSUPERBLOCK;
220
221	/** XFS superblock magic. */
222	#define XFS_SB_MAGIC RT_MAKE_U32_FROM_U8('B', 'S', 'F', 'X')
223
224	/** @name XFS_SB_VERSION_F_XXX - Version/Feature flags.
225	* @{ */
226	/** Retrieves the version part of the field. */
227	#define XFS_SB_VERSION_GET(a_fVersion) ((a_fVersion) & 0xf)
228	/** Version number for filesystem 5.3, 6.0.1 and 6.1. */
229	#define XFS_SB_VERSION_1 1
230	/** Version number for filesystem 6.2 - attributes. */
231	#define XFS_SB_VERSION_2 2
232	/** Version number for filesystem 6.2 - new inode version. */
233	#define XFS_SB_VERSION_3 3
234	/** Version number for filesystem 6.2+ - new bitmask version. */
235	#define XFS_SB_VERSION_4 4
236	/** Introduced checksums in the metadata. */
237	#define XFS_SB_VERSION_5 5
238	/** Extended attributes are used for at least one inode. */
239	#define XFS_SB_VERSION_F_ATTR RT_BIT_32(4)
240	/** At least one inode use 32-bit nlink values. */
241	#define XFS_SB_VERSION_F_NLINK RT_BIT_32(5)
242	/** Quotas are enabled on the filesystem. */
243	#define XFS_SB_VERSION_F_QUOTA RT_BIT_32(6)
244	/** Set if XFSSUPERBLOCK::cBlocksInodeAlignment is used. */
245	#define XFS_SB_VERSION_F_ALIGN RT_BIT_32(7)
246	/** Set if XFSSUPERBLOCK::cBlocksRaidStripe and XFSSUPERBLOCK::cBlocksRaidWidth are used. */
247	#define XFS_SB_VERSION_F_DALIGN RT_BIT_32(8)
248	/** Set if XFSSUPERBLOCK::uSharedVn is used. */
249	#define XFS_SB_VERSION_F_SHARED RT_BIT_32(9)
250	/** Version 2 journaling is used. */
251	#define XFS_SB_VERSION_F_LOGV2 RT_BIT_32(10)
252	/** Set if sector size is not 512 bytes. */
253	#define XFS_SB_VERSION_F_SECTOR RT_BIT_32(11)
254	/** Set if unwritten extents are used (always set). */
255	#define XFS_SB_VERSION_F_EXTFLG RT_BIT_32(12)
256	/** Version 2 directories are used (always set). */
257	#define XFS_SB_VERSION_F_DIRV2 RT_BIT_32(13)
258	/** Set if XFSSUPERBLOCK::fFeatures2 is used. */
259	#define XFS_SB_VERSION_F_FEAT2 RT_BIT_32(14)
260	/** @} */
261
262	/** @name XFS_SB_QUOTA_F_XXX - Quota flags
263	* @{ */
264	/** User quota accounting enabled. */
265	#define XFS_SB_QUOTA_F_USR_ACCT RT_BIT(0)
266	/** User quotas are enforced. */
267	#define XFS_SB_QUOTA_F_USR_ENFD RT_BIT(1)
268	/** User quotas have been checked and updated on disk. */
269	#define XFS_SB_QUOTA_F_USR_CHKD RT_BIT(2)
270	/** Project quota accounting is enabled. */
271	#define XFS_SB_QUOTA_F_PROJ_ACCT RT_BIT(3)
272	/** Other quotas are enforced. */
273	#define XFS_SB_QUOTA_F_OTH_ENFD RT_BIT(4)
274	/** Other quotas have been checked and updated on disk. */
275	#define XFS_SB_QUOTA_F_OTH_CHKD RT_BIT(5)
276	/** Group quota accounting enabled. */
277	#define XFS_SB_QUOTA_F_GRP_ACCT RT_BIT(6)
278	/** @} */
279
280	/** @name XFS_SB_FEATURES2_F_XXX - Additional features
281	* @{ */
282	/** Global counters are lazy and are only updated when the filesystem is cleanly unmounted. */
283	#define XFS_SB_FEATURES2_F_LAZYSBCOUNT RT_BIT_32(1)
284	/** Extended attributes version 2. */
285	#define XFS_SB_FEATURES2_F_ATTR2 RT_BIT_32(3)
286	/** Parent pointers, inodes must have an extended attribute pointing to the parent inode. */
287	#define XFS_SB_FEATURES2_F_PARENT RT_BIT_32(4)
288	/** @} */
289
290
291	/**
292	* XFS AG free space block.
293	*/
294	typedef struct XFSAGF
295	{
296	/** Magic number. */
297	uint32_t u32Magic;
298	/** Header version number. */
299	uint32_t uVersion;
300	/** AG number for the sector. */
301	uint32_t uSeqNo;
302	/** Length of the AG in filesystem blocks. */
303	uint32_t cLengthBlocks;
304	/** Block numbers for the roots of the free space B+trees. */
305	uint32_t auRoots[3];
306	/** Depths of the free space B+trees. */
307	uint32_t acLvls[3];
308	/** Index of the first free list block. */
309	uint32_t idxFreeListFirst;
310	/** Index of the last free list block. */
311	uint32_t idxFreeListLast;
312	/** Number of blocks in the free list. */
313	uint32_t cFreeListBlocks;
314	/** Current number of free blocks in the AG. */
315	uint32_t cFreeBlocks;
316	/** Longest number of contiguous free blocks in the AG. */
317	uint32_t cFreeBlocksLongest;
318	/** Number of blocks used for the free space B+-trees. */
319	uint32_t cBlocksBTrees;
320	/** UUID of filesystem the AG belongs to. */
321	uint8_t abUuid[16];
322	/** Number of blocks used for the reverse map. */
323	uint32_t cBlocksRevMap;
324	/** Number of blocks used for the refcount B+-tree. */
325	uint32_t cBlocksRefcountBTree;
326	/** Block number for the refcount tree root. */
327	uint32_t uRootRefcount;
328	/** Depth of the refcount B+-tree. */
329	uint32_t cLvlRefcount;
330	/** Reserved contiguous space for future extensions. */
331	uint64_t au64Rsvd[14];
332	/** Last write sequence number. */
333	uint64_t uSeqNoLastWrite;
334	/** CRC of the AGF. */
335	uint32_t uChkSum;
336	/** Padding to 64 bit alignment. */
337	uint32_t uAlignment0;
338	} XFSAGF;
339	/** Pointer to a AG free space block. */
340	typedef XFSAGF *PXFSAGF;
341	/** Poiner to a const AG free space block. */
342	typedef const XFSAGF *PCXFSAGF;
343
344	/** AGF magic. */
345	#define XFS_AGF_MAGIC RT_MAKE_U32_FROM_U8('F', 'G', 'A', 'X')
346	/** The current valid AGF version. */
347	#define XFS_AGF_VERSION 1
348
349
350	/**
351	* XFS AG inode information.
352	*/
353	typedef struct XFSAGI
354	{
355	/** Magic number. */
356	uint32_t u32Magic;
357	/** Header version number. */
358	uint32_t uVersion;
359	/** AG number for the sector. */
360	uint32_t uSeqNo;
361	/** Length of the AG in filesystem blocks. */
362	uint32_t cLengthBlocks;
363	/** Count of allocated inodes. */
364	uint32_t cInodesAlloc;
365	/** Block number of the inode tree root. */
366	uint32_t uRootInode;
367	/** Depth of the inode B+-tree. */
368	uint32_t cLvlsInode;
369	/** Newest allocated inode. */
370	uint32_t uInodeNew;
371	/** Last directory inode chunk. */
372	uint32_t uInodeDir;
373	/** Hash table of unlinked but still referenced inodes. */
374	uint32_t au32HashUnlinked[64];
375	/** UUID of filesystem. */
376	uint8_t abUuid[16];
377	/** CRC of the AGI. */
378	uint32_t uChkSum;
379	/** Padding. */
380	uint32_t uAlignment0;
381	/** Last write sequence number. */
382	uint64_t uSeqNoLastWrite;
383	/** Block number of the free inode tree. */
384	uint32_t uRootFreeInode;
385	/** Depth of the free inode B+-tree. */
386	uint32_t cLvlsFreeInode;
387	} XFSAGI;
388	/** Pointer to a AG inode information. */
389	typedef XFSAGI *PXFSAGI;
390	/** Pointer to a const AG inode information. */
391	typedef const XFSAGI *PCXFSAGI;
392
393	/** AGI magic. */
394	#define XFS_AGI_MAGIC RT_MAKE_U32_FROM_U8('I', 'G', 'A', 'X')
395	/** The current valid AGI version. */
396	#define XFS_AGI_VERSION 1
397
398
399	/**
400	* XFS timestamp structure.
401	*/
402	typedef struct XFSTIMESTAMP
403	{
404	/** 0x00: The second part of the timestamp since the epoch. */
405	int32_t cSecEpoch;
406	/** 0x04: Nanosecond part of the timestamp. */
407	int32_t cNanoSec;
408	} XFSTIMESTAMP;
409	/** Pointer to a XFS timestamp. */
410	typedef XFSTIMESTAMP *PXFSTIMESTAMP;
411	/** Poiner to a const CFS timestamp. */
412	typedef const XFSTIMESTAMP *PCXFSTIMESTAMP;
413
414
415	/**
416	* The inode core structure.
417	*/
418	typedef struct XFSINODECORE
419	{
420	/** 0x00: Magic value. */
421	uint16_t u16Magic;
422	/** 0x02: File mode and access bits (XFS_INODE_MODE_XXX). */
423	uint16_t fMode;
424	/** 0x04: Inode version. */
425	int8_t iVersion;
426	/** 0x05: The format of the data fork. */
427	int8_t enmFormat;
428	/** 0x06: Number of links to this inode from directories for v1 inodes. */
429	uint16_t cOnLinks;
430	/** 0x08: Owners UID. */
431	uint32_t uUid;
432	/** 0x0c: Owners GID. */
433	uint32_t uGid;
434	/** 0x10: The number of links to this inode for v2 inodes. */
435	uint32_t cLinks;
436	/** 0x14: Project ID for v2 inodes (not used for v1, low 16bits). */
437	uint16_t uProjIdLow;
438	/** 0x16: Project ID for v2 inodes (not used for v1, high 16bits). */
439	uint16_t uProjIdHigh;
440	/** 0x18: Padding. */
441	uint8_t abPad0[6];
442	/** 0x1e: Flush counter. */
443	uint16_t cFlush;
444	/** 0x20: Last accessed timestamp. */
445	XFSTIMESTAMP TsLastAccessed;
446	/** 0x28: Last modified timestamp. */
447	XFSTIMESTAMP TsLastModified;
448	/** 0x30: Inode created/modified timestamp. */
449	XFSTIMESTAMP TsCreatedModified;
450	/** 0x38: Number of bytes in the file. */
451	uint64_t cbInode;
452	/** 0x40: Number of direct and B-Tree blocks used for the forks. */
453	uint64_t cBlocks;
454	/** 0x48: Minimum extent size for the inode. */
455	uint32_t cExtentBlocksMin;
456	/** 0x4c: Number of extents in the data fork. */
457	uint32_t cExtentsData;
458	/** 0x50: Number of extents in the attribute fork. */
459	uint16_t cExtentsAttr;
460	/** 0x52: Offset of the attribute fork from the start of the inode. */
461	uint8_t offAttrFork;
462	/** 0x53: Attribute fork format. */
463	int8_t enmFormatAttr;
464	/** 0x54: DMIG event mask. */
465	uint32_t fEvtMaskDmig;
466	/** 0x58: DMIG state info. */
467	uint16_t uStateDmig;
468	/** 0x5a: Inode flags. */
469	uint16_t fFlags;
470	/** 0x5c: Generation number. */
471	uint32_t cGeneration;
472	/** 0x60: AGI unlinked list pointer. */
473	uint32_t offBlockUnlinkedNext;
474	/** The following fields are for v3 inodes only. */
475	/** 0x64: The CRC of the inode. */
476	uint32_t uChkSum;
477	/** 0x68: Number of attribute changes. */
478	uint64_t cAttrChanges;
479	/** 0x70: Last flush sequence number. */
480	uint64_t uFlushSeqNo;
481	/** 0x78: Additional flags. */
482	uint64_t fFlags2;
483	/** 0x80: Basic COW extent size. */
484	uint32_t cExtentCowMin;
485	/** 0x84: Padding for future expansion. */
486	uint8_t abPad1[12];
487	/** 0x90: Inode creation timestamp. */
488	XFSTIMESTAMP TsCreation;
489	/** 0x98: The inode number. */
490	uint64_t uInode;
491	/** 0x100: Filesystem UUID the inode belongs to. */
492	uint8_t abUuid[16];
493	} XFSINODECORE;
494	AssertCompileSizeAlignment(XFSINODECORE, 8);
495	/** Pointer to a inode core. */
496	typedef XFSINODECORE *PXFSINODECORE;
497	/** Pointer to a const inode core. */
498	typedef const XFSINODECORE *PCXFSINODECORE;
499
500	/** Inode magic. */
501	#define XFS_INODE_MAGIC RT_MAKE_U16_FROM_U8('N', 'I')
502
503	/** @name XFS_INODE_MODE_XXX - File mode
504	* @{ */
505	/** Others can execute the file. */
506	#define XFS_INODE_MODE_EXEC_OTHER RT_BIT(0)
507	/** Others can write to the file. */
508	#define XFS_INODE_MODE_WRITE_OTHER RT_BIT(1)
509	/** Others can read the file. */
510	#define XFS_INODE_MODE_READ_OTHER RT_BIT(2)
511	/** Members of the same group can execute the file. */
512	#define XFS_INODE_MODE_EXEC_GROUP RT_BIT(3)
513	/** Members of the same group can write to the file. */
514	#define XFS_INODE_MODE_WRITE_GROUP RT_BIT(4)
515	/** Members of the same group can read the file. */
516	#define XFS_INODE_MODE_READ_GROUP RT_BIT(5)
517	/** Owner can execute the file. */
518	#define XFS_INODE_MODE_EXEC_OWNER RT_BIT(6)
519	/** Owner can write to the file. */
520	#define XFS_INODE_MODE_WRITE_OWNER RT_BIT(7)
521	/** Owner can read the file. */
522	#define XFS_INODE_MODE_READ_OWNER RT_BIT(8)
523	/** Sticky file mode. */
524	#define XFS_INODE_MODE_STICKY RT_BIT(9)
525	/** File is set GID. */
526	#define XFS_INODE_MODE_SET_GROUP_ID RT_BIT(10)
527	/** File is set UID. */
528	#define XFS_INODE_MODE_SET_USER_ID RT_BIT(11)
529	/** @} */
530
531	/** @name XFS_INODE_MODE_TYPE_XXX - File type
532	* @{ */
533	/** Inode represents a FIFO. */
534	#define XFS_INODE_MODE_TYPE_FIFO UINT16_C(0x1000)
535	/** Inode represents a character device. */
536	#define XFS_INODE_MODE_TYPE_CHAR UINT16_C(0x2000)
537	/** Inode represents a directory. */
538	#define XFS_INODE_MODE_TYPE_DIR UINT16_C(0x4000)
539	/** Inode represents a block device. */
540	#define XFS_INODE_MODE_TYPE_BLOCK UINT16_C(0x6000)
541	/** Inode represents a regular file. */
542	#define XFS_INODE_MODE_TYPE_REGULAR UINT16_C(0x8000)
543	/** Inode represents a symlink. */
544	#define XFS_INODE_MODE_TYPE_SYMLINK UINT16_C(0xa000)
545	/** Inode represents a socket. */
546	#define XFS_INODE_MODE_TYPE_SOCKET UINT16_C(0xc000)
547	/** Returns the inode type from the combined mode field. */
548	#define XFS_INODE_MODE_TYPE_GET_TYPE(a_Mode) ((a_Mode) & 0xf000)
549	/** @} */
550
551	/** @name XFS_INODE_FORMAT_XXX - Inode data fork format.
552	* @{ */
553	/** Device node data. */
554	#define XFS_INODE_FORMAT_DEV 0
555	/** Inline data. */
556	#define XFS_INODE_FORMAT_LOCAL 1
557	/** Array of extent descriptors. */
558	#define XFS_INODE_FORMAT_EXTENTS 2
559	/** Data fork contains root of B-Tree. */
560	#define XFS_INODE_FORMAT_BTREE 3
561	/** Data fork contains UUID. */
562	#define XFS_INODE_FORMAT_UUID 4
563	/** @} */
564
565	/** @name XFS_INODE_F_XXX - Inode flags.
566	* @{ */
567	/** File data blocks are stored in the real-time device area. */
568	#define XFS_INODE_F_RTDEV RT_BIT(0)
569	/** File space has been pre-allocated. */
570	#define XFS_INODE_F_PREALLOC RT_BIT(1)
571	/** Use new real-time bitmap format. */
572	#define XFS_INODE_F_NEWRTBITMAP RT_BIT(2)
573	/** Inode is immutable. */
574	#define XFS_INODE_F_IMMUTABLE RT_BIT(3)
575	/** Inode is append only. */
576	#define XFS_INODE_F_APPEND RT_BIT(4)
577	/** Inode is written synchronously. */
578	#define XFS_INODE_F_SYNC RT_BIT(5)
579	/** The last accessed timestamp is not updated. */
580	#define XFS_INODE_F_NOATIME RT_BIT(6)
581	/** The inode is not dumpable via dump(1). */
582	#define XFS_INODE_F_NODUMP RT_BIT(7)
583	/** Create with real-time bit set. */
584	#define XFS_INODE_F_RTINHERIT RT_BIT(8)
585	/** Create with parents project ID. */
586	#define XFS_INODE_F_PROJIDINHERIT RT_BIT(9)
587	/** Deny symlink creation. */
588	#define XFS_INODE_F_NOSYMLINKS RT_BIT(10)
589	/** Inode extent size allocator hint. */
590	#define XFS_INODE_F_EXTSIZEHINT RT_BIT(11)
591	/** Inode extent size is inherited. */
592	#define XFS_INODE_F_EXTSIZEINHERIT RT_BIT(12)
593	/** Do not defrag/reorganize the inode. */
594	#define XFS_INODE_F_NODEFRAG RT_BIT(13)
595	/** Use filestream allocator. */
596	#define XFS_INODE_F_FILESTREAM RT_BIT(14)
597	/** @} */
598
599	/** @name XFS_INODE_F2_XXX - Inode flags number 2 (XFSINODECORE::fFlags2).
600	* @{ */
601	/** Use DAX for the inode. */
602	#define XFS_INODE_F2_DAX RT_BIT_64(0)
603	/** Blocks use reference counting for sharing. */
604	#define XFS_INODE_F2_REFLINK RT_BIT_64(1)
605	/** Inode COW extent size hint is valid. */
606	#define XFS_INODE_F2_COWEXTSIZEHINT RT_BIT_64(2)
607	/** @} */
608
609
610	/**
611	* Inode B-Tree record.
612	*/
613	typedef struct XFSINODEBTREEREC
614	{
615	/** 0x00: Starting inode number. */
616	uint32_t uInodeStart;
617	/** 0x04: Version dependent data. */
618	union
619	{
620	/** Full (old) version. */
621	struct
622	{
623	/** 0x04: Number of free inodes. */
624	uint32_t cInodesFree;
625	} Full;
626	/** Sparse (new) version. */
627	struct
628	{
629	/** 0x04: Hole mask for sparse chunks. */
630	uint16_t bmHoles;
631	/** 0x06: Total number of inodes. */
632	uint8_t cInodes;
633	/** 0x07: Number of free inodes. */
634	uint8_t cInodesFree;
635	} Sparse;
636	} u;
637	/** 0x08: Free inode mask. */
638	uint64_t bmInodesFree;
639	} XFSINODEBTREEREC;
640	/** Pointer to an inode B-Tree record. */
641	typedef XFSINODEBTREEREC *PXFSINODEBTREEREC;
642	/** Pointer to a const inode B-Tree record. */
643	typedef const XFSINODEBTREEREC *PCXFSINODEBTREEREC;
644
645
646	/**
647	* XFS B+Tree root header.
648	*/
649	typedef struct XFSBTREEROOTHDR
650	{
651	/** 0x00: Tree level. */
652	uint16_t iLvl;
653	/** 0x02: Number of records. */
654	uint16_t cRecs;
655	} XFSBTREEROOTHDR;
656	/** Pointer to a B+Tree root header */
657	typedef XFSBTREEROOTHDR *PXFSBTREEROOTHDR;
658	/** Pointer to a const B+Tree root header. */
659	typedef const XFSBTREEROOTHDR *PCXFSBTREEROOTHDR;
660
661
662	/**
663	* XFS B+Tree intermediate/leave node header.
664	*/
665	typedef struct XFSBTREENODEHDR
666	{
667	/** 0x00: Magic identifying the node. */
668	uint32_t u32Magic;
669	/** 0x04: Tree level. */
670	uint16_t iLvl;
671	/** 0x06: Number of records. */
672	uint16_t cRecs;
673	/** 0x08: Block number of the left sibling. */
674	uint64_t uSibLeft;
675	/** 0x10: Block number of the right sibling. */
676	uint64_t uSibRight;
677	} XFSBTREENODEHDR;
678	/** Pointer to a B+Tree intermediate/leave node header. */
679	typedef XFSBTREENODEHDR *PXFSBTREENODEHDR;
680	/** Pointer to a const B+Tree intermediate/leave node header. */
681	typedef const XFSBTREENODEHDR *PCXFSBTREENODEHDR;
682
683	/** @name XFS_BTREENODEHDR_XXX - B+Tree node related defines.
684	* @{ */
685	/** Magic for the tree node header. */
686	#define XFS_BTREENODEHDR_MAGIC RT_MAKE_U32_FROM_U8('P', 'A', 'M', 'B')
687	/** @} */
688
689
690	/**
691	* XFS Extent.
692	*/
693	typedef struct XFSEXTENT
694	{
695	/** 0x00: Low 64 bits. */
696	uint64_t u64Low;
697	/** 0x08: High 64 bits. */
698	uint64_t u64High;
699	} XFSEXTENT;
700	/** Pointer to an XFS extent. */
701	typedef XFSEXTENT *PXFSEXTENT;
702	/** Pointer to a const XFS extent. */
703	typedef const XFSEXTENT *PCXFSEXTENT;
704
705	/** @name XFS_EXTENT_XXX - Extent related getters.
706	* @{ */
707	/** Returns whether the extent is allocated but unwritten (true) or a normal extent (false). */
708	#define XFS_EXTENT_IS_UNWRITTEN(a_pExtent) (RT_BOOL((a_pExtent)->u64High & RT_BIT_64(63)))
709	/** Returns the number of blocks the extent covers. */
710	#define XFS_EXTENT_GET_BLOCK_COUNT(a_pExtent) ((a_pExtent)->u64Low & UINT64_C(0x1fffff))
711	/** Returns the absolute block number where the data is stored on the disk. */
712	#define XFS_EXTENT_GET_DISK_BLOCK(a_pExtent) ( (((a_pExtent)->u64High & UINT64_C(0x1ff)) << 42) \
713	\| (((a_pExtent)->u64Low & UINT64_C(0xffffffffffe00000)) >> 21))
714	/** Returns the logical inode block offset. */
715	#define XFS_EXTENT_GET_LOGICAL_BLOCK(a_pExtent) (((a_pExtent)->u64High & UINT64_C(0x7ffffffffffffe00)) >> 9)
716	/** @} */
717
718	/** @} */
719
720	#endif /* !IPRT_INCLUDED_formats_xfs_h */
721

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source: vbox/trunk/include/iprt/formats/xfs.h@ 105688

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