2 * layout.h - All NTFS associated on-disk structures. Part of the Linux-NTFS
5 * Copyright (c) 2001-2005 Anton Altaparmakov
6 * Copyright (c) 2002 Richard Russon
8 * This program/include file is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as published
10 * by the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program/include file is distributed in the hope that it will be
14 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program (in the main directory of the Linux-NTFS
20 * distribution in the file COPYING); if not, write to the Free Software
21 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #ifndef _LINUX_NTFS_LAYOUT_H
25 #define _LINUX_NTFS_LAYOUT_H
27 #include <linux/types.h>
28 #include <linux/bitops.h>
29 #include <linux/list.h>
30 #include <asm/byteorder.h>
35 * Constant endianness conversion defines.
37 #define const_le16_to_cpu(x) __constant_le16_to_cpu(x)
38 #define const_le32_to_cpu(x) __constant_le32_to_cpu(x)
39 #define const_le64_to_cpu(x) __constant_le64_to_cpu(x)
41 #define const_cpu_to_le16(x) __constant_cpu_to_le16(x)
42 #define const_cpu_to_le32(x) __constant_cpu_to_le32(x)
43 #define const_cpu_to_le64(x) __constant_cpu_to_le64(x)
45 /* The NTFS oem_id "NTFS " */
46 #define magicNTFS const_cpu_to_le64(0x202020205346544eULL)
49 * Location of bootsector on partition:
50 * The standard NTFS_BOOT_SECTOR is on sector 0 of the partition.
51 * On NT4 and above there is one backup copy of the boot sector to
52 * be found on the last sector of the partition (not normally accessible
53 * from within Windows as the bootsector contained number of sectors
54 * value is one less than the actual value!).
55 * On versions of NT 3.51 and earlier, the backup copy was located at
56 * number of sectors/2 (integer divide), i.e. in the middle of the volume.
60 * BIOS parameter block (bpb) structure.
63 le16 bytes_per_sector; /* Size of a sector in bytes. */
64 u8 sectors_per_cluster; /* Size of a cluster in sectors. */
65 le16 reserved_sectors; /* zero */
67 le16 root_entries; /* zero */
68 le16 sectors; /* zero */
69 u8 media_type; /* 0xf8 = hard disk */
70 le16 sectors_per_fat; /* zero */
71 le16 sectors_per_track; /* irrelevant */
72 le16 heads; /* irrelevant */
73 le32 hidden_sectors; /* zero */
74 le32 large_sectors; /* zero */
75 } __attribute__ ((__packed__)) BIOS_PARAMETER_BLOCK;
78 * NTFS boot sector structure.
81 u8 jump[3]; /* Irrelevant (jump to boot up code).*/
82 le64 oem_id; /* Magic "NTFS ". */
83 BIOS_PARAMETER_BLOCK bpb; /* See BIOS_PARAMETER_BLOCK. */
84 u8 unused[4]; /* zero, NTFS diskedit.exe states that
86 __u8 physical_drive; // 0x80
87 __u8 current_head; // zero
88 __u8 extended_boot_signature;
92 /*0x28*/sle64 number_of_sectors; /* Number of sectors in volume. Gives
93 maximum volume size of 2^63 sectors.
94 Assuming standard sector size of 512
95 bytes, the maximum byte size is
96 approx. 4.7x10^21 bytes. (-; */
97 sle64 mft_lcn; /* Cluster location of mft data. */
98 sle64 mftmirr_lcn; /* Cluster location of copy of mft. */
99 s8 clusters_per_mft_record; /* Mft record size in clusters. */
100 u8 reserved0[3]; /* zero */
101 s8 clusters_per_index_record; /* Index block size in clusters. */
102 u8 reserved1[3]; /* zero */
103 le64 volume_serial_number; /* Irrelevant (serial number). */
104 le32 checksum; /* Boot sector checksum. */
105 /*0x54*/u8 bootstrap[426]; /* Irrelevant (boot up code). */
106 le16 end_of_sector_marker; /* End of bootsector magic. Always is
107 0xaa55 in little endian. */
108 /* sizeof() = 512 (0x200) bytes */
109 } __attribute__ ((__packed__)) NTFS_BOOT_SECTOR;
112 * Magic identifiers present at the beginning of all ntfs record containing
113 * records (like mft records for example).
116 /* Found in $MFT/$DATA. */
117 magic_FILE = const_cpu_to_le32(0x454c4946), /* Mft entry. */
118 magic_INDX = const_cpu_to_le32(0x58444e49), /* Index buffer. */
119 magic_HOLE = const_cpu_to_le32(0x454c4f48), /* ? (NTFS 3.0+?) */
121 /* Found in $LogFile/$DATA. */
122 magic_RSTR = const_cpu_to_le32(0x52545352), /* Restart page. */
123 magic_RCRD = const_cpu_to_le32(0x44524352), /* Log record page. */
125 /* Found in $LogFile/$DATA. (May be found in $MFT/$DATA, also?) */
126 magic_CHKD = const_cpu_to_le32(0x444b4843), /* Modified by chkdsk. */
128 /* Found in all ntfs record containing records. */
129 magic_BAAD = const_cpu_to_le32(0x44414142), /* Failed multi sector
130 transfer was detected. */
132 * Found in $LogFile/$DATA when a page is full of 0xff bytes and is
133 * thus not initialized. Page must be initialized before using it.
135 magic_empty = const_cpu_to_le32(0xffffffff) /* Record is empty. */
138 typedef le32 NTFS_RECORD_TYPE;
141 * Generic magic comparison macros. Finally found a use for the ## preprocessor
145 static inline BOOL __ntfs_is_magic(le32 x, NTFS_RECORD_TYPE r)
149 #define ntfs_is_magic(x, m) __ntfs_is_magic(x, magic_##m)
151 static inline BOOL __ntfs_is_magicp(le32 *p, NTFS_RECORD_TYPE r)
155 #define ntfs_is_magicp(p, m) __ntfs_is_magicp(p, magic_##m)
158 * Specialised magic comparison macros for the NTFS_RECORD_TYPEs defined above.
160 #define ntfs_is_file_record(x) ( ntfs_is_magic (x, FILE) )
161 #define ntfs_is_file_recordp(p) ( ntfs_is_magicp(p, FILE) )
162 #define ntfs_is_mft_record(x) ( ntfs_is_file_record (x) )
163 #define ntfs_is_mft_recordp(p) ( ntfs_is_file_recordp(p) )
164 #define ntfs_is_indx_record(x) ( ntfs_is_magic (x, INDX) )
165 #define ntfs_is_indx_recordp(p) ( ntfs_is_magicp(p, INDX) )
166 #define ntfs_is_hole_record(x) ( ntfs_is_magic (x, HOLE) )
167 #define ntfs_is_hole_recordp(p) ( ntfs_is_magicp(p, HOLE) )
169 #define ntfs_is_rstr_record(x) ( ntfs_is_magic (x, RSTR) )
170 #define ntfs_is_rstr_recordp(p) ( ntfs_is_magicp(p, RSTR) )
171 #define ntfs_is_rcrd_record(x) ( ntfs_is_magic (x, RCRD) )
172 #define ntfs_is_rcrd_recordp(p) ( ntfs_is_magicp(p, RCRD) )
174 #define ntfs_is_chkd_record(x) ( ntfs_is_magic (x, CHKD) )
175 #define ntfs_is_chkd_recordp(p) ( ntfs_is_magicp(p, CHKD) )
177 #define ntfs_is_baad_record(x) ( ntfs_is_magic (x, BAAD) )
178 #define ntfs_is_baad_recordp(p) ( ntfs_is_magicp(p, BAAD) )
180 #define ntfs_is_empty_record(x) ( ntfs_is_magic (x, empty) )
181 #define ntfs_is_empty_recordp(p) ( ntfs_is_magicp(p, empty) )
184 * The Update Sequence Array (usa) is an array of the le16 values which belong
185 * to the end of each sector protected by the update sequence record in which
186 * this array is contained. Note that the first entry is the Update Sequence
187 * Number (usn), a cyclic counter of how many times the protected record has
188 * been written to disk. The values 0 and -1 (ie. 0xffff) are not used. All
189 * last le16's of each sector have to be equal to the usn (during reading) or
190 * are set to it (during writing). If they are not, an incomplete multi sector
191 * transfer has occurred when the data was written.
192 * The maximum size for the update sequence array is fixed to:
193 * maximum size = usa_ofs + (usa_count * 2) = 510 bytes
194 * The 510 bytes comes from the fact that the last le16 in the array has to
195 * (obviously) finish before the last le16 of the first 512-byte sector.
196 * This formula can be used as a consistency check in that usa_ofs +
197 * (usa_count * 2) has to be less than or equal to 510.
200 NTFS_RECORD_TYPE magic; /* A four-byte magic identifying the record
201 type and/or status. */
202 le16 usa_ofs; /* Offset to the Update Sequence Array (usa)
203 from the start of the ntfs record. */
204 le16 usa_count; /* Number of le16 sized entries in the usa
205 including the Update Sequence Number (usn),
206 thus the number of fixups is the usa_count
208 } __attribute__ ((__packed__)) NTFS_RECORD;
211 * System files mft record numbers. All these files are always marked as used
212 * in the bitmap attribute of the mft; presumably in order to avoid accidental
213 * allocation for random other mft records. Also, the sequence number for each
214 * of the system files is always equal to their mft record number and it is
218 FILE_MFT = 0, /* Master file table (mft). Data attribute
219 contains the entries and bitmap attribute
220 records which ones are in use (bit==1). */
221 FILE_MFTMirr = 1, /* Mft mirror: copy of first four mft records
222 in data attribute. If cluster size > 4kiB,
223 copy of first N mft records, with
224 N = cluster_size / mft_record_size. */
225 FILE_LogFile = 2, /* Journalling log in data attribute. */
226 FILE_Volume = 3, /* Volume name attribute and volume information
227 attribute (flags and ntfs version). Windows
228 refers to this file as volume DASD (Direct
229 Access Storage Device). */
230 FILE_AttrDef = 4, /* Array of attribute definitions in data
232 FILE_root = 5, /* Root directory. */
233 FILE_Bitmap = 6, /* Allocation bitmap of all clusters (lcns) in
235 FILE_Boot = 7, /* Boot sector (always at cluster 0) in data
237 FILE_BadClus = 8, /* Contains all bad clusters in the non-resident
239 FILE_Secure = 9, /* Shared security descriptors in data attribute
240 and two indexes into the descriptors.
241 Appeared in Windows 2000. Before that, this
242 file was named $Quota but was unused. */
243 FILE_UpCase = 10, /* Uppercase equivalents of all 65536 Unicode
244 characters in data attribute. */
245 FILE_Extend = 11, /* Directory containing other system files (eg.
246 $ObjId, $Quota, $Reparse and $UsnJrnl). This
247 is new to NTFS3.0. */
248 FILE_reserved12 = 12, /* Reserved for future use (records 12-15). */
249 FILE_reserved13 = 13,
250 FILE_reserved14 = 14,
251 FILE_reserved15 = 15,
252 FILE_first_user = 16, /* First user file, used as test limit for
253 whether to allow opening a file or not. */
257 * These are the so far known MFT_RECORD_* flags (16-bit) which contain
258 * information about the mft record in which they are present.
261 MFT_RECORD_IN_USE = const_cpu_to_le16(0x0001),
262 MFT_RECORD_IS_DIRECTORY = const_cpu_to_le16(0x0002),
263 } __attribute__ ((__packed__));
265 typedef le16 MFT_RECORD_FLAGS;
268 * mft references (aka file references or file record segment references) are
269 * used whenever a structure needs to refer to a record in the mft.
271 * A reference consists of a 48-bit index into the mft and a 16-bit sequence
272 * number used to detect stale references.
274 * For error reporting purposes we treat the 48-bit index as a signed quantity.
276 * The sequence number is a circular counter (skipping 0) describing how many
277 * times the referenced mft record has been (re)used. This has to match the
278 * sequence number of the mft record being referenced, otherwise the reference
279 * is considered stale and removed (FIXME: only ntfsck or the driver itself?).
281 * If the sequence number is zero it is assumed that no sequence number
282 * consistency checking should be performed.
284 * FIXME: Since inodes are 32-bit as of now, the driver needs to always check
285 * for high_part being 0 and if not either BUG(), cause a panic() or handle
286 * the situation in some other way. This shouldn't be a problem as a volume has
287 * to become HUGE in order to need more than 32-bits worth of mft records.
288 * Assuming the standard mft record size of 1kb only the records (never mind
289 * the non-resident attributes, etc.) would require 4Tb of space on their own
290 * for the first 32 bits worth of records. This is only if some strange person
291 * doesn't decide to foul play and make the mft sparse which would be a really
292 * horrible thing to do as it would trash our current driver implementation. )-:
293 * Do I hear screams "we want 64-bit inodes!" ?!? (-;
295 * FIXME: The mft zone is defined as the first 12% of the volume. This space is
296 * reserved so that the mft can grow contiguously and hence doesn't become
297 * fragmented. Volume free space includes the empty part of the mft zone and
298 * when the volume's free 88% are used up, the mft zone is shrunk by a factor
299 * of 2, thus making more space available for more files/data. This process is
300 * repeated everytime there is no more free space except for the mft zone until
301 * there really is no more free space.
305 * Typedef the MFT_REF as a 64-bit value for easier handling.
306 * Also define two unpacking macros to get to the reference (MREF) and
307 * sequence number (MSEQNO) respectively.
308 * The _LE versions are to be applied on little endian MFT_REFs.
309 * Note: The _LE versions will return a CPU endian formatted value!
311 #define MFT_REF_MASK_CPU 0x0000ffffffffffffULL
312 #define MFT_REF_MASK_LE const_cpu_to_le64(MFT_REF_MASK_CPU)
315 typedef le64 leMFT_REF;
317 #define MK_MREF(m, s) ((MFT_REF)(((MFT_REF)(s) << 48) | \
318 ((MFT_REF)(m) & MFT_REF_MASK_CPU)))
319 #define MK_LE_MREF(m, s) cpu_to_le64(MK_MREF(m, s))
321 #define MREF(x) ((unsigned long)((x) & MFT_REF_MASK_CPU))
322 #define MSEQNO(x) ((u16)(((x) >> 48) & 0xffff))
323 #define MREF_LE(x) ((unsigned long)(le64_to_cpu(x) & MFT_REF_MASK_CPU))
324 #define MSEQNO_LE(x) ((u16)((le64_to_cpu(x) >> 48) & 0xffff))
326 #define IS_ERR_MREF(x) (((x) & 0x0000800000000000ULL) ? 1 : 0)
327 #define ERR_MREF(x) ((u64)((s64)(x)))
328 #define MREF_ERR(x) ((int)((s64)(x)))
331 * The mft record header present at the beginning of every record in the mft.
332 * This is followed by a sequence of variable length attribute records which
333 * is terminated by an attribute of type AT_END which is a truncated attribute
334 * in that it only consists of the attribute type code AT_END and none of the
335 * other members of the attribute structure are present.
339 /* 0 NTFS_RECORD; -- Unfolded here as gcc doesn't like unnamed structs. */
340 NTFS_RECORD_TYPE magic; /* Usually the magic is "FILE". */
341 le16 usa_ofs; /* See NTFS_RECORD definition above. */
342 le16 usa_count; /* See NTFS_RECORD definition above. */
344 /* 8*/ le64 lsn; /* $LogFile sequence number for this record.
345 Changed every time the record is modified. */
346 /* 16*/ le16 sequence_number; /* Number of times this mft record has been
347 reused. (See description for MFT_REF
348 above.) NOTE: The increment (skipping zero)
349 is done when the file is deleted. NOTE: If
350 this is zero it is left zero. */
351 /* 18*/ le16 link_count; /* Number of hard links, i.e. the number of
352 directory entries referencing this record.
353 NOTE: Only used in mft base records.
354 NOTE: When deleting a directory entry we
355 check the link_count and if it is 1 we
356 delete the file. Otherwise we delete the
357 FILE_NAME_ATTR being referenced by the
358 directory entry from the mft record and
359 decrement the link_count.
360 FIXME: Careful with Win32 + DOS names! */
361 /* 20*/ le16 attrs_offset; /* Byte offset to the first attribute in this
362 mft record from the start of the mft record.
363 NOTE: Must be aligned to 8-byte boundary. */
364 /* 22*/ MFT_RECORD_FLAGS flags; /* Bit array of MFT_RECORD_FLAGS. When a file
365 is deleted, the MFT_RECORD_IN_USE flag is
367 /* 24*/ le32 bytes_in_use; /* Number of bytes used in this mft record.
368 NOTE: Must be aligned to 8-byte boundary. */
369 /* 28*/ le32 bytes_allocated; /* Number of bytes allocated for this mft
370 record. This should be equal to the mft
372 /* 32*/ leMFT_REF base_mft_record;/* This is zero for base mft records.
373 When it is not zero it is a mft reference
374 pointing to the base mft record to which
375 this record belongs (this is then used to
376 locate the attribute list attribute present
377 in the base record which describes this
378 extension record and hence might need
379 modification when the extension record
380 itself is modified, also locating the
381 attribute list also means finding the other
382 potential extents, belonging to the non-base
384 /* 40*/ le16 next_attr_instance;/* The instance number that will be assigned to
385 the next attribute added to this mft record.
386 NOTE: Incremented each time after it is used.
387 NOTE: Every time the mft record is reused
388 this number is set to zero. NOTE: The first
389 instance number is always 0. */
390 /* The below fields are specific to NTFS 3.1+ (Windows XP and above): */
391 /* 42*/ le16 reserved; /* Reserved/alignment. */
392 /* 44*/ le32 mft_record_number; /* Number of this mft record. */
393 /* sizeof() = 48 bytes */
395 * When (re)using the mft record, we place the update sequence array at this
396 * offset, i.e. before we start with the attributes. This also makes sense,
397 * otherwise we could run into problems with the update sequence array
398 * containing in itself the last two bytes of a sector which would mean that
399 * multi sector transfer protection wouldn't work. As you can't protect data
400 * by overwriting it since you then can't get it back...
401 * When reading we obviously use the data from the ntfs record header.
403 } __attribute__ ((__packed__)) MFT_RECORD;
405 /* This is the version without the NTFS 3.1+ specific fields. */
408 /* 0 NTFS_RECORD; -- Unfolded here as gcc doesn't like unnamed structs. */
409 NTFS_RECORD_TYPE magic; /* Usually the magic is "FILE". */
410 le16 usa_ofs; /* See NTFS_RECORD definition above. */
411 le16 usa_count; /* See NTFS_RECORD definition above. */
413 /* 8*/ le64 lsn; /* $LogFile sequence number for this record.
414 Changed every time the record is modified. */
415 /* 16*/ le16 sequence_number; /* Number of times this mft record has been
416 reused. (See description for MFT_REF
417 above.) NOTE: The increment (skipping zero)
418 is done when the file is deleted. NOTE: If
419 this is zero it is left zero. */
420 /* 18*/ le16 link_count; /* Number of hard links, i.e. the number of
421 directory entries referencing this record.
422 NOTE: Only used in mft base records.
423 NOTE: When deleting a directory entry we
424 check the link_count and if it is 1 we
425 delete the file. Otherwise we delete the
426 FILE_NAME_ATTR being referenced by the
427 directory entry from the mft record and
428 decrement the link_count.
429 FIXME: Careful with Win32 + DOS names! */
430 /* 20*/ le16 attrs_offset; /* Byte offset to the first attribute in this
431 mft record from the start of the mft record.
432 NOTE: Must be aligned to 8-byte boundary. */
433 /* 22*/ MFT_RECORD_FLAGS flags; /* Bit array of MFT_RECORD_FLAGS. When a file
434 is deleted, the MFT_RECORD_IN_USE flag is
436 /* 24*/ le32 bytes_in_use; /* Number of bytes used in this mft record.
437 NOTE: Must be aligned to 8-byte boundary. */
438 /* 28*/ le32 bytes_allocated; /* Number of bytes allocated for this mft
439 record. This should be equal to the mft
441 /* 32*/ leMFT_REF base_mft_record;/* This is zero for base mft records.
442 When it is not zero it is a mft reference
443 pointing to the base mft record to which
444 this record belongs (this is then used to
445 locate the attribute list attribute present
446 in the base record which describes this
447 extension record and hence might need
448 modification when the extension record
449 itself is modified, also locating the
450 attribute list also means finding the other
451 potential extents, belonging to the non-base
453 /* 40*/ le16 next_attr_instance;/* The instance number that will be assigned to
454 the next attribute added to this mft record.
455 NOTE: Incremented each time after it is used.
456 NOTE: Every time the mft record is reused
457 this number is set to zero. NOTE: The first
458 instance number is always 0. */
459 /* sizeof() = 42 bytes */
461 * When (re)using the mft record, we place the update sequence array at this
462 * offset, i.e. before we start with the attributes. This also makes sense,
463 * otherwise we could run into problems with the update sequence array
464 * containing in itself the last two bytes of a sector which would mean that
465 * multi sector transfer protection wouldn't work. As you can't protect data
466 * by overwriting it since you then can't get it back...
467 * When reading we obviously use the data from the ntfs record header.
469 } __attribute__ ((__packed__)) MFT_RECORD_OLD;
472 * System defined attributes (32-bit). Each attribute type has a corresponding
473 * attribute name (Unicode string of maximum 64 character length) as described
474 * by the attribute definitions present in the data attribute of the $AttrDef
475 * system file. On NTFS 3.0 volumes the names are just as the types are named
476 * in the below defines exchanging AT_ for the dollar sign ($). If that is not
477 * a revealing choice of symbol I do not know what is... (-;
480 AT_UNUSED = const_cpu_to_le32( 0),
481 AT_STANDARD_INFORMATION = const_cpu_to_le32( 0x10),
482 AT_ATTRIBUTE_LIST = const_cpu_to_le32( 0x20),
483 AT_FILE_NAME = const_cpu_to_le32( 0x30),
484 AT_OBJECT_ID = const_cpu_to_le32( 0x40),
485 AT_SECURITY_DESCRIPTOR = const_cpu_to_le32( 0x50),
486 AT_VOLUME_NAME = const_cpu_to_le32( 0x60),
487 AT_VOLUME_INFORMATION = const_cpu_to_le32( 0x70),
488 AT_DATA = const_cpu_to_le32( 0x80),
489 AT_INDEX_ROOT = const_cpu_to_le32( 0x90),
490 AT_INDEX_ALLOCATION = const_cpu_to_le32( 0xa0),
491 AT_BITMAP = const_cpu_to_le32( 0xb0),
492 AT_REPARSE_POINT = const_cpu_to_le32( 0xc0),
493 AT_EA_INFORMATION = const_cpu_to_le32( 0xd0),
494 AT_EA = const_cpu_to_le32( 0xe0),
495 AT_PROPERTY_SET = const_cpu_to_le32( 0xf0),
496 AT_LOGGED_UTILITY_STREAM = const_cpu_to_le32( 0x100),
497 AT_FIRST_USER_DEFINED_ATTRIBUTE = const_cpu_to_le32( 0x1000),
498 AT_END = const_cpu_to_le32(0xffffffff)
501 typedef le32 ATTR_TYPE;
504 * The collation rules for sorting views/indexes/etc (32-bit).
506 * COLLATION_BINARY - Collate by binary compare where the first byte is most
508 * COLLATION_UNICODE_STRING - Collate Unicode strings by comparing their binary
509 * Unicode values, except that when a character can be uppercased, the
510 * upper case value collates before the lower case one.
511 * COLLATION_FILE_NAME - Collate file names as Unicode strings. The collation
512 * is done very much like COLLATION_UNICODE_STRING. In fact I have no idea
513 * what the difference is. Perhaps the difference is that file names
514 * would treat some special characters in an odd way (see
515 * unistr.c::ntfs_collate_names() and unistr.c::legal_ansi_char_array[]
516 * for what I mean but COLLATION_UNICODE_STRING would not give any special
517 * treatment to any characters at all, but this is speculation.
518 * COLLATION_NTOFS_ULONG - Sorting is done according to ascending le32 key
519 * values. E.g. used for $SII index in FILE_Secure, which sorts by
520 * security_id (le32).
521 * COLLATION_NTOFS_SID - Sorting is done according to ascending SID values.
522 * E.g. used for $O index in FILE_Extend/$Quota.
523 * COLLATION_NTOFS_SECURITY_HASH - Sorting is done first by ascending hash
524 * values and second by ascending security_id values. E.g. used for $SDH
525 * index in FILE_Secure.
526 * COLLATION_NTOFS_ULONGS - Sorting is done according to a sequence of ascending
527 * le32 key values. E.g. used for $O index in FILE_Extend/$ObjId, which
528 * sorts by object_id (16-byte), by splitting up the object_id in four
529 * le32 values and using them as individual keys. E.g. take the following
530 * two security_ids, stored as follows on disk:
531 * 1st: a1 61 65 b7 65 7b d4 11 9e 3d 00 e0 81 10 42 59
532 * 2nd: 38 14 37 d2 d2 f3 d4 11 a5 21 c8 6b 79 b1 97 45
533 * To compare them, they are split into four le32 values each, like so:
534 * 1st: 0xb76561a1 0x11d47b65 0xe0003d9e 0x59421081
535 * 2nd: 0xd2371438 0x11d4f3d2 0x6bc821a5 0x4597b179
536 * Now, it is apparent why the 2nd object_id collates after the 1st: the
537 * first le32 value of the 1st object_id is less than the first le32 of
538 * the 2nd object_id. If the first le32 values of both object_ids were
539 * equal then the second le32 values would be compared, etc.
542 COLLATION_BINARY = const_cpu_to_le32(0x00),
543 COLLATION_FILE_NAME = const_cpu_to_le32(0x01),
544 COLLATION_UNICODE_STRING = const_cpu_to_le32(0x02),
545 COLLATION_NTOFS_ULONG = const_cpu_to_le32(0x10),
546 COLLATION_NTOFS_SID = const_cpu_to_le32(0x11),
547 COLLATION_NTOFS_SECURITY_HASH = const_cpu_to_le32(0x12),
548 COLLATION_NTOFS_ULONGS = const_cpu_to_le32(0x13),
551 typedef le32 COLLATION_RULE;
554 * The flags (32-bit) describing attribute properties in the attribute
555 * definition structure. FIXME: This information is based on Regis's
556 * information and, according to him, it is not certain and probably
557 * incomplete. The INDEXABLE flag is fairly certainly correct as only the file
558 * name attribute has this flag set and this is the only attribute indexed in
562 ATTR_DEF_INDEXABLE = const_cpu_to_le32(0x02), /* Attribute can be
564 ATTR_DEF_MULTIPLE = const_cpu_to_le32(0x04), /* Attribute type
565 can be present multiple times in the
566 mft records of an inode. */
567 ATTR_DEF_NOT_ZERO = const_cpu_to_le32(0x08), /* Attribute value
568 must contain at least one non-zero
570 ATTR_DEF_INDEXED_UNIQUE = const_cpu_to_le32(0x10), /* Attribute must be
571 indexed and the attribute value must be
572 unique for the attribute type in all of
573 the mft records of an inode. */
574 ATTR_DEF_NAMED_UNIQUE = const_cpu_to_le32(0x20), /* Attribute must be
575 named and the name must be unique for
576 the attribute type in all of the mft
577 records of an inode. */
578 ATTR_DEF_RESIDENT = const_cpu_to_le32(0x40), /* Attribute must be
580 ATTR_DEF_ALWAYS_LOG = const_cpu_to_le32(0x80), /* Always log
581 modifications to this attribute,
582 regardless of whether it is resident or
583 non-resident. Without this, only log
584 modifications if the attribute is
588 typedef le32 ATTR_DEF_FLAGS;
591 * The data attribute of FILE_AttrDef contains a sequence of attribute
592 * definitions for the NTFS volume. With this, it is supposed to be safe for an
593 * older NTFS driver to mount a volume containing a newer NTFS version without
594 * damaging it (that's the theory. In practice it's: not damaging it too much).
595 * Entries are sorted by attribute type. The flags describe whether the
596 * attribute can be resident/non-resident and possibly other things, but the
597 * actual bits are unknown.
601 /* 0*/ ntfschar name[0x40]; /* Unicode name of the attribute. Zero
603 /* 80*/ ATTR_TYPE type; /* Type of the attribute. */
604 /* 84*/ le32 display_rule; /* Default display rule.
605 FIXME: What does it mean? (AIA) */
606 /* 88*/ COLLATION_RULE collation_rule; /* Default collation rule. */
607 /* 8c*/ ATTR_DEF_FLAGS flags; /* Flags describing the attribute. */
608 /* 90*/ sle64 min_size; /* Optional minimum attribute size. */
609 /* 98*/ sle64 max_size; /* Maximum size of attribute. */
610 /* sizeof() = 0xa0 or 160 bytes */
611 } __attribute__ ((__packed__)) ATTR_DEF;
614 * Attribute flags (16-bit).
617 ATTR_IS_COMPRESSED = const_cpu_to_le16(0x0001),
618 ATTR_COMPRESSION_MASK = const_cpu_to_le16(0x00ff), /* Compression method
621 ATTR_IS_ENCRYPTED = const_cpu_to_le16(0x4000),
622 ATTR_IS_SPARSE = const_cpu_to_le16(0x8000),
623 } __attribute__ ((__packed__));
625 typedef le16 ATTR_FLAGS;
628 * Attribute compression.
630 * Only the data attribute is ever compressed in the current ntfs driver in
631 * Windows. Further, compression is only applied when the data attribute is
632 * non-resident. Finally, to use compression, the maximum allowed cluster size
633 * on a volume is 4kib.
635 * The compression method is based on independently compressing blocks of X
636 * clusters, where X is determined from the compression_unit value found in the
637 * non-resident attribute record header (more precisely: X = 2^compression_unit
638 * clusters). On Windows NT/2k, X always is 16 clusters (compression_unit = 4).
640 * There are three different cases of how a compression block of X clusters
643 * 1) The data in the block is all zero (a sparse block):
644 * This is stored as a sparse block in the runlist, i.e. the runlist
645 * entry has length = X and lcn = -1. The mapping pairs array actually
646 * uses a delta_lcn value length of 0, i.e. delta_lcn is not present at
647 * all, which is then interpreted by the driver as lcn = -1.
648 * NOTE: Even uncompressed files can be sparse on NTFS 3.0 volumes, then
649 * the same principles apply as above, except that the length is not
650 * restricted to being any particular value.
652 * 2) The data in the block is not compressed:
653 * This happens when compression doesn't reduce the size of the block
654 * in clusters. I.e. if compression has a small effect so that the
655 * compressed data still occupies X clusters, then the uncompressed data
656 * is stored in the block.
657 * This case is recognised by the fact that the runlist entry has
658 * length = X and lcn >= 0. The mapping pairs array stores this as
659 * normal with a run length of X and some specific delta_lcn, i.e.
660 * delta_lcn has to be present.
662 * 3) The data in the block is compressed:
663 * The common case. This case is recognised by the fact that the run
664 * list entry has length L < X and lcn >= 0. The mapping pairs array
665 * stores this as normal with a run length of X and some specific
666 * delta_lcn, i.e. delta_lcn has to be present. This runlist entry is
667 * immediately followed by a sparse entry with length = X - L and
668 * lcn = -1. The latter entry is to make up the vcn counting to the
669 * full compression block size X.
671 * In fact, life is more complicated because adjacent entries of the same type
672 * can be coalesced. This means that one has to keep track of the number of
673 * clusters handled and work on a basis of X clusters at a time being one
674 * block. An example: if length L > X this means that this particular runlist
675 * entry contains a block of length X and part of one or more blocks of length
676 * L - X. Another example: if length L < X, this does not necessarily mean that
677 * the block is compressed as it might be that the lcn changes inside the block
678 * and hence the following runlist entry describes the continuation of the
679 * potentially compressed block. The block would be compressed if the
680 * following runlist entry describes at least X - L sparse clusters, thus
681 * making up the compression block length as described in point 3 above. (Of
682 * course, there can be several runlist entries with small lengths so that the
683 * sparse entry does not follow the first data containing entry with
686 * NOTE: At the end of the compressed attribute value, there most likely is not
687 * just the right amount of data to make up a compression block, thus this data
688 * is not even attempted to be compressed. It is just stored as is, unless
689 * the number of clusters it occupies is reduced when compressed in which case
690 * it is stored as a compressed compression block, complete with sparse
691 * clusters at the end.
695 * Flags of resident attributes (8-bit).
698 RESIDENT_ATTR_IS_INDEXED = 0x01, /* Attribute is referenced in an index
699 (has implications for deleting and
700 modifying the attribute). */
701 } __attribute__ ((__packed__));
703 typedef u8 RESIDENT_ATTR_FLAGS;
706 * Attribute record header. Always aligned to 8-byte boundary.
710 /* 0*/ ATTR_TYPE type; /* The (32-bit) type of the attribute. */
711 /* 4*/ le32 length; /* Byte size of the resident part of the
712 attribute (aligned to 8-byte boundary).
713 Used to get to the next attribute. */
714 /* 8*/ u8 non_resident; /* If 0, attribute is resident.
715 If 1, attribute is non-resident. */
716 /* 9*/ u8 name_length; /* Unicode character size of name of attribute.
718 /* 10*/ le16 name_offset; /* If name_length != 0, the byte offset to the
719 beginning of the name from the attribute
720 record. Note that the name is stored as a
721 Unicode string. When creating, place offset
722 just at the end of the record header. Then,
723 follow with attribute value or mapping pairs
724 array, resident and non-resident attributes
725 respectively, aligning to an 8-byte
727 /* 12*/ ATTR_FLAGS flags; /* Flags describing the attribute. */
728 /* 14*/ le16 instance; /* The instance of this attribute record. This
729 number is unique within this mft record (see
730 MFT_RECORD/next_attribute_instance notes in
731 in mft.h for more details). */
733 /* Resident attributes. */
735 /* 16 */ le32 value_length;/* Byte size of attribute value. */
736 /* 20 */ le16 value_offset;/* Byte offset of the attribute
737 value from the start of the
738 attribute record. When creating,
739 align to 8-byte boundary if we
740 have a name present as this might
741 not have a length of a multiple
743 /* 22 */ RESIDENT_ATTR_FLAGS flags; /* See above. */
744 /* 23 */ s8 reserved; /* Reserved/alignment to 8-byte
746 } __attribute__ ((__packed__)) resident;
747 /* Non-resident attributes. */
749 /* 16*/ leVCN lowest_vcn;/* Lowest valid virtual cluster number
750 for this portion of the attribute value or
751 0 if this is the only extent (usually the
752 case). - Only when an attribute list is used
753 does lowest_vcn != 0 ever occur. */
754 /* 24*/ leVCN highest_vcn;/* Highest valid vcn of this extent of
755 the attribute value. - Usually there is only one
756 portion, so this usually equals the attribute
757 value size in clusters minus 1. Can be -1 for
758 zero length files. Can be 0 for "single extent"
760 /* 32*/ le16 mapping_pairs_offset; /* Byte offset from the
761 beginning of the structure to the mapping pairs
762 array which contains the mappings between the
763 vcns and the logical cluster numbers (lcns).
764 When creating, place this at the end of this
765 record header aligned to 8-byte boundary. */
766 /* 34*/ u8 compression_unit; /* The compression unit expressed
767 as the log to the base 2 of the number of
768 clusters in a compression unit. 0 means not
769 compressed. (This effectively limits the
770 compression unit size to be a power of two
771 clusters.) WinNT4 only uses a value of 4.
772 Sparse files have this set to 0 on XPSP2. */
773 /* 35*/ u8 reserved[5]; /* Align to 8-byte boundary. */
774 /* The sizes below are only used when lowest_vcn is zero, as otherwise it would
775 be difficult to keep them up-to-date.*/
776 /* 40*/ sle64 allocated_size; /* Byte size of disk space
777 allocated to hold the attribute value. Always
778 is a multiple of the cluster size. When a file
779 is compressed, this field is a multiple of the
780 compression block size (2^compression_unit) and
781 it represents the logically allocated space
782 rather than the actual on disk usage. For this
783 use the compressed_size (see below). */
784 /* 48*/ sle64 data_size; /* Byte size of the attribute
785 value. Can be larger than allocated_size if
786 attribute value is compressed or sparse. */
787 /* 56*/ sle64 initialized_size; /* Byte size of initialized
788 portion of the attribute value. Usually equals
790 /* sizeof(uncompressed attr) = 64*/
791 /* 64*/ sle64 compressed_size; /* Byte size of the attribute
792 value after compression. Only present when
793 compressed or sparse. Always is a multiple of
794 the cluster size. Represents the actual amount
795 of disk space being used on the disk. */
796 /* sizeof(compressed attr) = 72*/
797 } __attribute__ ((__packed__)) non_resident;
798 } __attribute__ ((__packed__)) data;
799 } __attribute__ ((__packed__)) ATTR_RECORD;
801 typedef ATTR_RECORD ATTR_REC;
804 * File attribute flags (32-bit).
808 * The following flags are only present in the STANDARD_INFORMATION
809 * attribute (in the field file_attributes).
811 FILE_ATTR_READONLY = const_cpu_to_le32(0x00000001),
812 FILE_ATTR_HIDDEN = const_cpu_to_le32(0x00000002),
813 FILE_ATTR_SYSTEM = const_cpu_to_le32(0x00000004),
814 /* Old DOS volid. Unused in NT. = const_cpu_to_le32(0x00000008), */
816 FILE_ATTR_DIRECTORY = const_cpu_to_le32(0x00000010),
817 /* Note, FILE_ATTR_DIRECTORY is not considered valid in NT. It is
818 reserved for the DOS SUBDIRECTORY flag. */
819 FILE_ATTR_ARCHIVE = const_cpu_to_le32(0x00000020),
820 FILE_ATTR_DEVICE = const_cpu_to_le32(0x00000040),
821 FILE_ATTR_NORMAL = const_cpu_to_le32(0x00000080),
823 FILE_ATTR_TEMPORARY = const_cpu_to_le32(0x00000100),
824 FILE_ATTR_SPARSE_FILE = const_cpu_to_le32(0x00000200),
825 FILE_ATTR_REPARSE_POINT = const_cpu_to_le32(0x00000400),
826 FILE_ATTR_COMPRESSED = const_cpu_to_le32(0x00000800),
828 FILE_ATTR_OFFLINE = const_cpu_to_le32(0x00001000),
829 FILE_ATTR_NOT_CONTENT_INDEXED = const_cpu_to_le32(0x00002000),
830 FILE_ATTR_ENCRYPTED = const_cpu_to_le32(0x00004000),
832 FILE_ATTR_VALID_FLAGS = const_cpu_to_le32(0x00007fb7),
833 /* Note, FILE_ATTR_VALID_FLAGS masks out the old DOS VolId and the
834 FILE_ATTR_DEVICE and preserves everything else. This mask is used
835 to obtain all flags that are valid for reading. */
836 FILE_ATTR_VALID_SET_FLAGS = const_cpu_to_le32(0x000031a7),
837 /* Note, FILE_ATTR_VALID_SET_FLAGS masks out the old DOS VolId, the
838 F_A_DEVICE, F_A_DIRECTORY, F_A_SPARSE_FILE, F_A_REPARSE_POINT,
839 F_A_COMPRESSED, and F_A_ENCRYPTED and preserves the rest. This mask
840 is used to to obtain all flags that are valid for setting. */
842 * The following flag is only present in the FILE_NAME attribute (in
843 * the field file_attributes).
845 FILE_ATTR_DUP_FILE_NAME_INDEX_PRESENT = const_cpu_to_le32(0x10000000),
846 /* Note, this is a copy of the corresponding bit from the mft record,
847 telling us whether this is a directory or not, i.e. whether it has
848 an index root attribute or not. */
850 * The following flag is present both in the STANDARD_INFORMATION
851 * attribute and in the FILE_NAME attribute (in the field
854 FILE_ATTR_DUP_VIEW_INDEX_PRESENT = const_cpu_to_le32(0x20000000),
855 /* Note, this is a copy of the corresponding bit from the mft record,
856 telling us whether this file has a view index present (eg. object id
857 index, quota index, one of the security indexes or the encrypting
858 filesystem related indexes). */
861 typedef le32 FILE_ATTR_FLAGS;
864 * NOTE on times in NTFS: All times are in MS standard time format, i.e. they
865 * are the number of 100-nanosecond intervals since 1st January 1601, 00:00:00
866 * universal coordinated time (UTC). (In Linux time starts 1st January 1970,
867 * 00:00:00 UTC and is stored as the number of 1-second intervals since then.)
871 * Attribute: Standard information (0x10).
873 * NOTE: Always resident.
874 * NOTE: Present in all base file records on a volume.
875 * NOTE: There is conflicting information about the meaning of each of the time
876 * fields but the meaning as defined below has been verified to be
877 * correct by practical experimentation on Windows NT4 SP6a and is hence
878 * assumed to be the one and only correct interpretation.
882 /* 0*/ sle64 creation_time; /* Time file was created. Updated when
883 a filename is changed(?). */
884 /* 8*/ sle64 last_data_change_time; /* Time the data attribute was last
886 /* 16*/ sle64 last_mft_change_time; /* Time this mft record was last
888 /* 24*/ sle64 last_access_time; /* Approximate time when the file was
889 last accessed (obviously this is not
890 updated on read-only volumes). In
891 Windows this is only updated when
892 accessed if some time delta has
893 passed since the last update. Also,
894 last access times updates can be
895 disabled altogether for speed. */
896 /* 32*/ FILE_ATTR_FLAGS file_attributes; /* Flags describing the file. */
900 /* 36*/ u8 reserved12[12]; /* Reserved/alignment to 8-byte
902 } __attribute__ ((__packed__)) v1;
903 /* sizeof() = 48 bytes */
907 * If a volume has been upgraded from a previous NTFS version, then these
908 * fields are present only if the file has been accessed since the upgrade.
909 * Recognize the difference by comparing the length of the resident attribute
910 * value. If it is 48, then the following fields are missing. If it is 72 then
911 * the fields are present. Maybe just check like this:
912 * if (resident.ValueLength < sizeof(STANDARD_INFORMATION)) {
913 * Assume NTFS 1.2- format.
914 * If (volume version is 3.x)
915 * Upgrade attribute to NTFS 3.x format.
917 * Use NTFS 1.2- format for access.
919 * Use NTFS 3.x format for access.
920 * Only problem is that it might be legal to set the length of the value to
921 * arbitrarily large values thus spoiling this check. - But chkdsk probably
922 * views that as a corruption, assuming that it behaves like this for all
925 /* 36*/ le32 maximum_versions; /* Maximum allowed versions for
926 file. Zero if version numbering is disabled. */
927 /* 40*/ le32 version_number; /* This file's version (if any).
928 Set to zero if maximum_versions is zero. */
929 /* 44*/ le32 class_id; /* Class id from bidirectional
930 class id index (?). */
931 /* 48*/ le32 owner_id; /* Owner_id of the user owning
932 the file. Translate via $Q index in FILE_Extend
933 /$Quota to the quota control entry for the user
934 owning the file. Zero if quotas are disabled. */
935 /* 52*/ le32 security_id; /* Security_id for the file.
936 Translate via $SII index and $SDS data stream
937 in FILE_Secure to the security descriptor. */
938 /* 56*/ le64 quota_charged; /* Byte size of the charge to
939 the quota for all streams of the file. Note: Is
940 zero if quotas are disabled. */
941 /* 64*/ leUSN usn; /* Last update sequence number
942 of the file. This is a direct index into the
943 transaction log file ($UsnJrnl). It is zero if
944 the usn journal is disabled or this file has
945 not been subject to logging yet. See usnjrnl.h
947 } __attribute__ ((__packed__)) v3;
948 /* sizeof() = 72 bytes (NTFS 3.x) */
949 } __attribute__ ((__packed__)) ver;
950 } __attribute__ ((__packed__)) STANDARD_INFORMATION;
953 * Attribute: Attribute list (0x20).
955 * - Can be either resident or non-resident.
956 * - Value consists of a sequence of variable length, 8-byte aligned,
957 * ATTR_LIST_ENTRY records.
958 * - The list is not terminated by anything at all! The only way to know when
959 * the end is reached is to keep track of the current offset and compare it to
960 * the attribute value size.
961 * - The attribute list attribute contains one entry for each attribute of
962 * the file in which the list is located, except for the list attribute
963 * itself. The list is sorted: first by attribute type, second by attribute
964 * name (if present), third by instance number. The extents of one
965 * non-resident attribute (if present) immediately follow after the initial
966 * extent. They are ordered by lowest_vcn and have their instace set to zero.
967 * It is not allowed to have two attributes with all sorting keys equal.
968 * - Further restrictions:
969 * - If not resident, the vcn to lcn mapping array has to fit inside the
971 * - The attribute list attribute value has a maximum size of 256kb. This
972 * is imposed by the Windows cache manager.
973 * - Attribute lists are only used when the attributes of mft record do not
974 * fit inside the mft record despite all attributes (that can be made
975 * non-resident) having been made non-resident. This can happen e.g. when:
976 * - File has a large number of hard links (lots of file name
977 * attributes present).
978 * - The mapping pairs array of some non-resident attribute becomes so
979 * large due to fragmentation that it overflows the mft record.
980 * - The security descriptor is very complex (not applicable to
982 * - There are many named streams.
986 /* 0*/ ATTR_TYPE type; /* Type of referenced attribute. */
987 /* 4*/ le16 length; /* Byte size of this entry (8-byte aligned). */
988 /* 6*/ u8 name_length; /* Size in Unicode chars of the name of the
989 attribute or 0 if unnamed. */
990 /* 7*/ u8 name_offset; /* Byte offset to beginning of attribute name
991 (always set this to where the name would
992 start even if unnamed). */
993 /* 8*/ leVCN lowest_vcn; /* Lowest virtual cluster number of this portion
994 of the attribute value. This is usually 0. It
995 is non-zero for the case where one attribute
996 does not fit into one mft record and thus
997 several mft records are allocated to hold
998 this attribute. In the latter case, each mft
999 record holds one extent of the attribute and
1000 there is one attribute list entry for each
1001 extent. NOTE: This is DEFINITELY a signed
1002 value! The windows driver uses cmp, followed
1003 by jg when comparing this, thus it treats it
1005 /* 16*/ leMFT_REF mft_reference;/* The reference of the mft record holding
1006 the ATTR_RECORD for this portion of the
1008 /* 24*/ le16 instance; /* If lowest_vcn = 0, the instance of the
1009 attribute being referenced; otherwise 0. */
1010 /* 26*/ ntfschar name[0]; /* Use when creating only. When reading use
1011 name_offset to determine the location of the
1013 /* sizeof() = 26 + (attribute_name_length * 2) bytes */
1014 } __attribute__ ((__packed__)) ATTR_LIST_ENTRY;
1017 * The maximum allowed length for a file name.
1019 #define MAXIMUM_FILE_NAME_LENGTH 255
1022 * Possible namespaces for filenames in ntfs (8-bit).
1025 FILE_NAME_POSIX = 0x00,
1026 /* This is the largest namespace. It is case sensitive and allows all
1027 Unicode characters except for: '\0' and '/'. Beware that in
1028 WinNT/2k/2003 by default files which eg have the same name except
1029 for their case will not be distinguished by the standard utilities
1030 and thus a "del filename" will delete both "filename" and "fileName"
1031 without warning. However if for example Services For Unix (SFU) are
1032 installed and the case sensitive option was enabled at installation
1033 time, then you can create/access/delete such files.
1034 Note that even SFU places restrictions on the filenames beyond the
1035 '\0' and '/' and in particular the following set of characters is
1036 not allowed: '"', '/', '<', '>', '\'. All other characters,
1037 including the ones no allowed in WIN32 namespace are allowed.
1038 Tested with SFU 3.5 (this is now free) running on Windows XP. */
1039 FILE_NAME_WIN32 = 0x01,
1040 /* The standard WinNT/2k NTFS long filenames. Case insensitive. All
1041 Unicode chars except: '\0', '"', '*', '/', ':', '<', '>', '?', '\',
1042 and '|'. Further, names cannot end with a '.' or a space. */
1043 FILE_NAME_DOS = 0x02,
1044 /* The standard DOS filenames (8.3 format). Uppercase only. All 8-bit
1045 characters greater space, except: '"', '*', '+', ',', '/', ':', ';',
1046 '<', '=', '>', '?', and '\'. */
1047 FILE_NAME_WIN32_AND_DOS = 0x03,
1048 /* 3 means that both the Win32 and the DOS filenames are identical and
1049 hence have been saved in this single filename record. */
1050 } __attribute__ ((__packed__));
1052 typedef u8 FILE_NAME_TYPE_FLAGS;
1055 * Attribute: Filename (0x30).
1057 * NOTE: Always resident.
1058 * NOTE: All fields, except the parent_directory, are only updated when the
1059 * filename is changed. Until then, they just become out of sync with
1060 * reality and the more up to date values are present in the standard
1061 * information attribute.
1062 * NOTE: There is conflicting information about the meaning of each of the time
1063 * fields but the meaning as defined below has been verified to be
1064 * correct by practical experimentation on Windows NT4 SP6a and is hence
1065 * assumed to be the one and only correct interpretation.
1069 /* 0*/ leMFT_REF parent_directory; /* Directory this filename is
1071 /* 8*/ sle64 creation_time; /* Time file was created. */
1072 /* 10*/ sle64 last_data_change_time; /* Time the data attribute was last
1074 /* 18*/ sle64 last_mft_change_time; /* Time this mft record was last
1076 /* 20*/ sle64 last_access_time; /* Time this mft record was last
1078 /* 28*/ sle64 allocated_size; /* Byte size of on-disk allocated space
1079 for the unnamed data attribute. So
1080 for normal $DATA, this is the
1081 allocated_size from the unnamed
1082 $DATA attribute and for compressed
1083 and/or sparse $DATA, this is the
1084 compressed_size from the unnamed
1085 $DATA attribute. For a directory or
1086 other inode without an unnamed $DATA
1087 attribute, this is always 0. NOTE:
1088 This is a multiple of the cluster
1090 /* 30*/ sle64 data_size; /* Byte size of actual data in unnamed
1091 data attribute. For a directory or
1092 other inode without an unnamed $DATA
1093 attribute, this is always 0. */
1094 /* 38*/ FILE_ATTR_FLAGS file_attributes; /* Flags describing the file. */
1097 /* 3c*/ le16 packed_ea_size; /* Size of the buffer needed to
1098 pack the extended attributes
1099 (EAs), if such are present.*/
1100 /* 3e*/ le16 reserved; /* Reserved for alignment. */
1101 } __attribute__ ((__packed__)) ea;
1103 /* 3c*/ le32 reparse_point_tag; /* Type of reparse point,
1104 present only in reparse
1105 points and only if there are
1107 } __attribute__ ((__packed__)) rp;
1108 } __attribute__ ((__packed__)) type;
1109 /* 40*/ u8 file_name_length; /* Length of file name in
1110 (Unicode) characters. */
1111 /* 41*/ FILE_NAME_TYPE_FLAGS file_name_type; /* Namespace of the file name.*/
1112 /* 42*/ ntfschar file_name[0]; /* File name in Unicode. */
1113 } __attribute__ ((__packed__)) FILE_NAME_ATTR;
1116 * GUID structures store globally unique identifiers (GUID). A GUID is a
1117 * 128-bit value consisting of one group of eight hexadecimal digits, followed
1118 * by three groups of four hexadecimal digits each, followed by one group of
1119 * twelve hexadecimal digits. GUIDs are Microsoft's implementation of the
1120 * distributed computing environment (DCE) universally unique identifier (UUID).
1121 * Example of a GUID:
1122 * 1F010768-5A73-BC91-0010A52216A7
1125 le32 data1; /* The first eight hexadecimal digits of the GUID. */
1126 le16 data2; /* The first group of four hexadecimal digits. */
1127 le16 data3; /* The second group of four hexadecimal digits. */
1128 u8 data4[8]; /* The first two bytes are the third group of four
1129 hexadecimal digits. The remaining six bytes are the
1130 final 12 hexadecimal digits. */
1131 } __attribute__ ((__packed__)) GUID;
1134 * FILE_Extend/$ObjId contains an index named $O. This index contains all
1135 * object_ids present on the volume as the index keys and the corresponding
1136 * mft_record numbers as the index entry data parts. The data part (defined
1137 * below) also contains three other object_ids:
1138 * birth_volume_id - object_id of FILE_Volume on which the file was first
1139 * created. Optional (i.e. can be zero).
1140 * birth_object_id - object_id of file when it was first created. Usually
1141 * equals the object_id. Optional (i.e. can be zero).
1142 * domain_id - Reserved (always zero).
1145 leMFT_REF mft_reference;/* Mft record containing the object_id in
1146 the index entry key. */
1149 GUID birth_volume_id;
1150 GUID birth_object_id;
1152 } __attribute__ ((__packed__)) origin;
1153 u8 extended_info[48];
1154 } __attribute__ ((__packed__)) opt;
1155 } __attribute__ ((__packed__)) OBJ_ID_INDEX_DATA;
1158 * Attribute: Object id (NTFS 3.0+) (0x40).
1160 * NOTE: Always resident.
1163 GUID object_id; /* Unique id assigned to the
1165 /* The following fields are optional. The attribute value size is 16
1166 bytes, i.e. sizeof(GUID), if these are not present at all. Note,
1167 the entries can be present but one or more (or all) can be zero
1168 meaning that that particular value(s) is(are) not defined. */
1171 GUID birth_volume_id; /* Unique id of volume on which
1172 the file was first created.*/
1173 GUID birth_object_id; /* Unique id of file when it was
1175 GUID domain_id; /* Reserved, zero. */
1176 } __attribute__ ((__packed__)) origin;
1177 u8 extended_info[48];
1178 } __attribute__ ((__packed__)) opt;
1179 } __attribute__ ((__packed__)) OBJECT_ID_ATTR;
1182 * The pre-defined IDENTIFIER_AUTHORITIES used as SID_IDENTIFIER_AUTHORITY in
1183 * the SID structure (see below).
1185 //typedef enum { /* SID string prefix. */
1186 // SECURITY_NULL_SID_AUTHORITY = {0, 0, 0, 0, 0, 0}, /* S-1-0 */
1187 // SECURITY_WORLD_SID_AUTHORITY = {0, 0, 0, 0, 0, 1}, /* S-1-1 */
1188 // SECURITY_LOCAL_SID_AUTHORITY = {0, 0, 0, 0, 0, 2}, /* S-1-2 */
1189 // SECURITY_CREATOR_SID_AUTHORITY = {0, 0, 0, 0, 0, 3}, /* S-1-3 */
1190 // SECURITY_NON_UNIQUE_AUTHORITY = {0, 0, 0, 0, 0, 4}, /* S-1-4 */
1191 // SECURITY_NT_SID_AUTHORITY = {0, 0, 0, 0, 0, 5}, /* S-1-5 */
1192 //} IDENTIFIER_AUTHORITIES;
1195 * These relative identifiers (RIDs) are used with the above identifier
1196 * authorities to make up universal well-known SIDs.
1198 * Note: The relative identifier (RID) refers to the portion of a SID, which
1199 * identifies a user or group in relation to the authority that issued the SID.
1200 * For example, the universal well-known SID Creator Owner ID (S-1-3-0) is
1201 * made up of the identifier authority SECURITY_CREATOR_SID_AUTHORITY (3) and
1202 * the relative identifier SECURITY_CREATOR_OWNER_RID (0).
1204 typedef enum { /* Identifier authority. */
1205 SECURITY_NULL_RID = 0, /* S-1-0 */
1206 SECURITY_WORLD_RID = 0, /* S-1-1 */
1207 SECURITY_LOCAL_RID = 0, /* S-1-2 */
1209 SECURITY_CREATOR_OWNER_RID = 0, /* S-1-3 */
1210 SECURITY_CREATOR_GROUP_RID = 1, /* S-1-3 */
1212 SECURITY_CREATOR_OWNER_SERVER_RID = 2, /* S-1-3 */
1213 SECURITY_CREATOR_GROUP_SERVER_RID = 3, /* S-1-3 */
1215 SECURITY_DIALUP_RID = 1,
1216 SECURITY_NETWORK_RID = 2,
1217 SECURITY_BATCH_RID = 3,
1218 SECURITY_INTERACTIVE_RID = 4,
1219 SECURITY_SERVICE_RID = 6,
1220 SECURITY_ANONYMOUS_LOGON_RID = 7,
1221 SECURITY_PROXY_RID = 8,
1222 SECURITY_ENTERPRISE_CONTROLLERS_RID=9,
1223 SECURITY_SERVER_LOGON_RID = 9,
1224 SECURITY_PRINCIPAL_SELF_RID = 0xa,
1225 SECURITY_AUTHENTICATED_USER_RID = 0xb,
1226 SECURITY_RESTRICTED_CODE_RID = 0xc,
1227 SECURITY_TERMINAL_SERVER_RID = 0xd,
1229 SECURITY_LOGON_IDS_RID = 5,
1230 SECURITY_LOGON_IDS_RID_COUNT = 3,
1232 SECURITY_LOCAL_SYSTEM_RID = 0x12,
1234 SECURITY_NT_NON_UNIQUE = 0x15,
1236 SECURITY_BUILTIN_DOMAIN_RID = 0x20,
1239 * Well-known domain relative sub-authority values (RIDs).
1243 DOMAIN_USER_RID_ADMIN = 0x1f4,
1244 DOMAIN_USER_RID_GUEST = 0x1f5,
1245 DOMAIN_USER_RID_KRBTGT = 0x1f6,
1248 DOMAIN_GROUP_RID_ADMINS = 0x200,
1249 DOMAIN_GROUP_RID_USERS = 0x201,
1250 DOMAIN_GROUP_RID_GUESTS = 0x202,
1251 DOMAIN_GROUP_RID_COMPUTERS = 0x203,
1252 DOMAIN_GROUP_RID_CONTROLLERS = 0x204,
1253 DOMAIN_GROUP_RID_CERT_ADMINS = 0x205,
1254 DOMAIN_GROUP_RID_SCHEMA_ADMINS = 0x206,
1255 DOMAIN_GROUP_RID_ENTERPRISE_ADMINS= 0x207,
1256 DOMAIN_GROUP_RID_POLICY_ADMINS = 0x208,
1259 DOMAIN_ALIAS_RID_ADMINS = 0x220,
1260 DOMAIN_ALIAS_RID_USERS = 0x221,
1261 DOMAIN_ALIAS_RID_GUESTS = 0x222,
1262 DOMAIN_ALIAS_RID_POWER_USERS = 0x223,
1264 DOMAIN_ALIAS_RID_ACCOUNT_OPS = 0x224,
1265 DOMAIN_ALIAS_RID_SYSTEM_OPS = 0x225,
1266 DOMAIN_ALIAS_RID_PRINT_OPS = 0x226,
1267 DOMAIN_ALIAS_RID_BACKUP_OPS = 0x227,
1269 DOMAIN_ALIAS_RID_REPLICATOR = 0x228,
1270 DOMAIN_ALIAS_RID_RAS_SERVERS = 0x229,
1271 DOMAIN_ALIAS_RID_PREW2KCOMPACCESS = 0x22a,
1272 } RELATIVE_IDENTIFIERS;
1275 * The universal well-known SIDs:
1280 * CREATOR_OWNER_SID S-1-3-0
1281 * CREATOR_GROUP_SID S-1-3-1
1282 * CREATOR_OWNER_SERVER_SID S-1-3-2
1283 * CREATOR_GROUP_SERVER_SID S-1-3-3
1285 * (Non-unique IDs) S-1-4
1287 * NT well-known SIDs:
1289 * NT_AUTHORITY_SID S-1-5
1290 * DIALUP_SID S-1-5-1
1292 * NETWORD_SID S-1-5-2
1294 * INTERACTIVE_SID S-1-5-4
1295 * SERVICE_SID S-1-5-6
1296 * ANONYMOUS_LOGON_SID S-1-5-7 (aka null logon session)
1298 * SERVER_LOGON_SID S-1-5-9 (aka domain controller account)
1299 * SELF_SID S-1-5-10 (self RID)
1300 * AUTHENTICATED_USER_SID S-1-5-11
1301 * RESTRICTED_CODE_SID S-1-5-12 (running restricted code)
1302 * TERMINAL_SERVER_SID S-1-5-13 (running on terminal server)
1304 * (Logon IDs) S-1-5-5-X-Y
1306 * (NT non-unique IDs) S-1-5-0x15-...
1308 * (Built-in domain) S-1-5-0x20
1312 * The SID_IDENTIFIER_AUTHORITY is a 48-bit value used in the SID structure.
1314 * NOTE: This is stored as a big endian number, hence the high_part comes
1315 * before the low_part.
1319 u16 high_part; /* High 16-bits. */
1320 u32 low_part; /* Low 32-bits. */
1321 } __attribute__ ((__packed__)) parts;
1322 u8 value[6]; /* Value as individual bytes. */
1323 } __attribute__ ((__packed__)) SID_IDENTIFIER_AUTHORITY;
1326 * The SID structure is a variable-length structure used to uniquely identify
1327 * users or groups. SID stands for security identifier.
1329 * The standard textual representation of the SID is of the form:
1332 * - The first "S" is the literal character 'S' identifying the following
1334 * - R is the revision level of the SID expressed as a sequence of digits
1335 * either in decimal or hexadecimal (if the later, prefixed by "0x").
1336 * - I is the 48-bit identifier_authority, expressed as digits as R above.
1337 * - S... is one or more sub_authority values, expressed as digits as above.
1339 * Example SID; the domain-relative SID of the local Administrators group on
1342 * This translates to a SID with:
1344 * sub_authority_count = 2,
1345 * identifier_authority = {0,0,0,0,0,5}, // SECURITY_NT_AUTHORITY
1346 * sub_authority[0] = 32, // SECURITY_BUILTIN_DOMAIN_RID
1347 * sub_authority[1] = 544 // DOMAIN_ALIAS_RID_ADMINS
1351 u8 sub_authority_count;
1352 SID_IDENTIFIER_AUTHORITY identifier_authority;
1353 le32 sub_authority[1]; /* At least one sub_authority. */
1354 } __attribute__ ((__packed__)) SID;
1357 * Current constants for SIDs.
1360 SID_REVISION = 1, /* Current revision level. */
1361 SID_MAX_SUB_AUTHORITIES = 15, /* Maximum number of those. */
1362 SID_RECOMMENDED_SUB_AUTHORITIES = 1, /* Will change to around 6 in
1363 a future revision. */
1367 * The predefined ACE types (8-bit, see below).
1370 ACCESS_MIN_MS_ACE_TYPE = 0,
1371 ACCESS_ALLOWED_ACE_TYPE = 0,
1372 ACCESS_DENIED_ACE_TYPE = 1,
1373 SYSTEM_AUDIT_ACE_TYPE = 2,
1374 SYSTEM_ALARM_ACE_TYPE = 3, /* Not implemented as of Win2k. */
1375 ACCESS_MAX_MS_V2_ACE_TYPE = 3,
1377 ACCESS_ALLOWED_COMPOUND_ACE_TYPE= 4,
1378 ACCESS_MAX_MS_V3_ACE_TYPE = 4,
1380 /* The following are Win2k only. */
1381 ACCESS_MIN_MS_OBJECT_ACE_TYPE = 5,
1382 ACCESS_ALLOWED_OBJECT_ACE_TYPE = 5,
1383 ACCESS_DENIED_OBJECT_ACE_TYPE = 6,
1384 SYSTEM_AUDIT_OBJECT_ACE_TYPE = 7,
1385 SYSTEM_ALARM_OBJECT_ACE_TYPE = 8,
1386 ACCESS_MAX_MS_OBJECT_ACE_TYPE = 8,
1388 ACCESS_MAX_MS_V4_ACE_TYPE = 8,
1390 /* This one is for WinNT/2k. */
1391 ACCESS_MAX_MS_ACE_TYPE = 8,
1392 } __attribute__ ((__packed__));
1394 typedef u8 ACE_TYPES;
1397 * The ACE flags (8-bit) for audit and inheritance (see below).
1399 * SUCCESSFUL_ACCESS_ACE_FLAG is only used with system audit and alarm ACE
1400 * types to indicate that a message is generated (in Windows!) for successful
1403 * FAILED_ACCESS_ACE_FLAG is only used with system audit and alarm ACE types
1404 * to indicate that a message is generated (in Windows!) for failed accesses.
1407 /* The inheritance flags. */
1408 OBJECT_INHERIT_ACE = 0x01,
1409 CONTAINER_INHERIT_ACE = 0x02,
1410 NO_PROPAGATE_INHERIT_ACE = 0x04,
1411 INHERIT_ONLY_ACE = 0x08,
1412 INHERITED_ACE = 0x10, /* Win2k only. */
1413 VALID_INHERIT_FLAGS = 0x1f,
1415 /* The audit flags. */
1416 SUCCESSFUL_ACCESS_ACE_FLAG = 0x40,
1417 FAILED_ACCESS_ACE_FLAG = 0x80,
1418 } __attribute__ ((__packed__));
1420 typedef u8 ACE_FLAGS;
1423 * An ACE is an access-control entry in an access-control list (ACL).
1424 * An ACE defines access to an object for a specific user or group or defines
1425 * the types of access that generate system-administration messages or alarms
1426 * for a specific user or group. The user or group is identified by a security
1429 * Each ACE starts with an ACE_HEADER structure (aligned on 4-byte boundary),
1430 * which specifies the type and size of the ACE. The format of the subsequent
1431 * data depends on the ACE type.
1435 /* 0*/ ACE_TYPES type; /* Type of the ACE. */
1436 /* 1*/ ACE_FLAGS flags; /* Flags describing the ACE. */
1437 /* 2*/ le16 size; /* Size in bytes of the ACE. */
1438 } __attribute__ ((__packed__)) ACE_HEADER;
1441 * The access mask (32-bit). Defines the access rights.
1443 * The specific rights (bits 0 to 15). These depend on the type of the object
1444 * being secured by the ACE.
1447 /* Specific rights for files and directories are as follows: */
1449 /* Right to read data from the file. (FILE) */
1450 FILE_READ_DATA = const_cpu_to_le32(0x00000001),
1451 /* Right to list contents of a directory. (DIRECTORY) */
1452 FILE_LIST_DIRECTORY = const_cpu_to_le32(0x00000001),
1454 /* Right to write data to the file. (FILE) */
1455 FILE_WRITE_DATA = const_cpu_to_le32(0x00000002),
1456 /* Right to create a file in the directory. (DIRECTORY) */
1457 FILE_ADD_FILE = const_cpu_to_le32(0x00000002),
1459 /* Right to append data to the file. (FILE) */
1460 FILE_APPEND_DATA = const_cpu_to_le32(0x00000004),
1461 /* Right to create a subdirectory. (DIRECTORY) */
1462 FILE_ADD_SUBDIRECTORY = const_cpu_to_le32(0x00000004),
1464 /* Right to read extended attributes. (FILE/DIRECTORY) */
1465 FILE_READ_EA = const_cpu_to_le32(0x00000008),
1467 /* Right to write extended attributes. (FILE/DIRECTORY) */
1468 FILE_WRITE_EA = const_cpu_to_le32(0x00000010),
1470 /* Right to execute a file. (FILE) */
1471 FILE_EXECUTE = const_cpu_to_le32(0x00000020),
1472 /* Right to traverse the directory. (DIRECTORY) */
1473 FILE_TRAVERSE = const_cpu_to_le32(0x00000020),
1476 * Right to delete a directory and all the files it contains (its
1477 * children), even if the files are read-only. (DIRECTORY)
1479 FILE_DELETE_CHILD = const_cpu_to_le32(0x00000040),
1481 /* Right to read file attributes. (FILE/DIRECTORY) */
1482 FILE_READ_ATTRIBUTES = const_cpu_to_le32(0x00000080),
1484 /* Right to change file attributes. (FILE/DIRECTORY) */
1485 FILE_WRITE_ATTRIBUTES = const_cpu_to_le32(0x00000100),
1488 * The standard rights (bits 16 to 23). These are independent of the
1489 * type of object being secured.
1492 /* Right to delete the object. */
1493 DELETE = const_cpu_to_le32(0x00010000),
1496 * Right to read the information in the object's security descriptor,
1497 * not including the information in the SACL, i.e. right to read the
1498 * security descriptor and owner.
1500 READ_CONTROL = const_cpu_to_le32(0x00020000),
1502 /* Right to modify the DACL in the object's security descriptor. */
1503 WRITE_DAC = const_cpu_to_le32(0x00040000),
1505 /* Right to change the owner in the object's security descriptor. */
1506 WRITE_OWNER = const_cpu_to_le32(0x00080000),
1509 * Right to use the object for synchronization. Enables a process to
1510 * wait until the object is in the signalled state. Some object types
1511 * do not support this access right.
1513 SYNCHRONIZE = const_cpu_to_le32(0x00100000),
1516 * The following STANDARD_RIGHTS_* are combinations of the above for
1517 * convenience and are defined by the Win32 API.
1520 /* These are currently defined to READ_CONTROL. */
1521 STANDARD_RIGHTS_READ = const_cpu_to_le32(0x00020000),
1522 STANDARD_RIGHTS_WRITE = const_cpu_to_le32(0x00020000),
1523 STANDARD_RIGHTS_EXECUTE = const_cpu_to_le32(0x00020000),
1525 /* Combines DELETE, READ_CONTROL, WRITE_DAC, and WRITE_OWNER access. */
1526 STANDARD_RIGHTS_REQUIRED = const_cpu_to_le32(0x000f0000),
1529 * Combines DELETE, READ_CONTROL, WRITE_DAC, WRITE_OWNER, and
1530 * SYNCHRONIZE access.
1532 STANDARD_RIGHTS_ALL = const_cpu_to_le32(0x001f0000),
1535 * The access system ACL and maximum allowed access types (bits 24 to
1536 * 25, bits 26 to 27 are reserved).
1538 ACCESS_SYSTEM_SECURITY = const_cpu_to_le32(0x01000000),
1539 MAXIMUM_ALLOWED = const_cpu_to_le32(0x02000000),
1542 * The generic rights (bits 28 to 31). These map onto the standard and
1546 /* Read, write, and execute access. */
1547 GENERIC_ALL = const_cpu_to_le32(0x10000000),
1549 /* Execute access. */
1550 GENERIC_EXECUTE = const_cpu_to_le32(0x20000000),
1553 * Write access. For files, this maps onto:
1554 * FILE_APPEND_DATA | FILE_WRITE_ATTRIBUTES | FILE_WRITE_DATA |
1555 * FILE_WRITE_EA | STANDARD_RIGHTS_WRITE | SYNCHRONIZE
1556 * For directories, the mapping has the same numerical value. See
1557 * above for the descriptions of the rights granted.
1559 GENERIC_WRITE = const_cpu_to_le32(0x40000000),
1562 * Read access. For files, this maps onto:
1563 * FILE_READ_ATTRIBUTES | FILE_READ_DATA | FILE_READ_EA |
1564 * STANDARD_RIGHTS_READ | SYNCHRONIZE
1565 * For directories, the mapping has the same numberical value. See
1566 * above for the descriptions of the rights granted.
1568 GENERIC_READ = const_cpu_to_le32(0x80000000),
1571 typedef le32 ACCESS_MASK;
1574 * The generic mapping array. Used to denote the mapping of each generic
1575 * access right to a specific access mask.
1577 * FIXME: What exactly is this and what is it for? (AIA)
1580 ACCESS_MASK generic_read;
1581 ACCESS_MASK generic_write;
1582 ACCESS_MASK generic_execute;
1583 ACCESS_MASK generic_all;
1584 } __attribute__ ((__packed__)) GENERIC_MAPPING;
1587 * The predefined ACE type structures are as defined below.
1591 * ACCESS_ALLOWED_ACE, ACCESS_DENIED_ACE, SYSTEM_AUDIT_ACE, SYSTEM_ALARM_ACE
1594 /* 0 ACE_HEADER; -- Unfolded here as gcc doesn't like unnamed structs. */
1595 ACE_TYPES type; /* Type of the ACE. */
1596 ACE_FLAGS flags; /* Flags describing the ACE. */
1597 le16 size; /* Size in bytes of the ACE. */
1598 /* 4*/ ACCESS_MASK mask; /* Access mask associated with the ACE. */
1600 /* 8*/ SID sid; /* The SID associated with the ACE. */
1601 } __attribute__ ((__packed__)) ACCESS_ALLOWED_ACE, ACCESS_DENIED_ACE,
1602 SYSTEM_AUDIT_ACE, SYSTEM_ALARM_ACE;
1605 * The object ACE flags (32-bit).
1608 ACE_OBJECT_TYPE_PRESENT = const_cpu_to_le32(1),
1609 ACE_INHERITED_OBJECT_TYPE_PRESENT = const_cpu_to_le32(2),
1612 typedef le32 OBJECT_ACE_FLAGS;
1615 /* 0 ACE_HEADER; -- Unfolded here as gcc doesn't like unnamed structs. */
1616 ACE_TYPES type; /* Type of the ACE. */
1617 ACE_FLAGS flags; /* Flags describing the ACE. */
1618 le16 size; /* Size in bytes of the ACE. */
1619 /* 4*/ ACCESS_MASK mask; /* Access mask associated with the ACE. */
1621 /* 8*/ OBJECT_ACE_FLAGS object_flags; /* Flags describing the object ACE. */
1622 /* 12*/ GUID object_type;
1623 /* 28*/ GUID inherited_object_type;
1625 /* 44*/ SID sid; /* The SID associated with the ACE. */
1626 } __attribute__ ((__packed__)) ACCESS_ALLOWED_OBJECT_ACE,
1627 ACCESS_DENIED_OBJECT_ACE,
1628 SYSTEM_AUDIT_OBJECT_ACE,
1629 SYSTEM_ALARM_OBJECT_ACE;
1632 * An ACL is an access-control list (ACL).
1633 * An ACL starts with an ACL header structure, which specifies the size of
1634 * the ACL and the number of ACEs it contains. The ACL header is followed by
1635 * zero or more access control entries (ACEs). The ACL as well as each ACE
1636 * are aligned on 4-byte boundaries.
1639 u8 revision; /* Revision of this ACL. */
1641 le16 size; /* Allocated space in bytes for ACL. Includes this
1642 header, the ACEs and the remaining free space. */
1643 le16 ace_count; /* Number of ACEs in the ACL. */
1645 /* sizeof() = 8 bytes */
1646 } __attribute__ ((__packed__)) ACL;
1649 * Current constants for ACLs.
1652 /* Current revision. */
1654 ACL_REVISION_DS = 4,
1656 /* History of revisions. */
1658 MIN_ACL_REVISION = 2,
1662 MAX_ACL_REVISION = 4,
1666 * The security descriptor control flags (16-bit).
1668 * SE_OWNER_DEFAULTED - This boolean flag, when set, indicates that the SID
1669 * pointed to by the Owner field was provided by a defaulting mechanism
1670 * rather than explicitly provided by the original provider of the
1671 * security descriptor. This may affect the treatment of the SID with
1672 * respect to inheritence of an owner.
1674 * SE_GROUP_DEFAULTED - This boolean flag, when set, indicates that the SID in
1675 * the Group field was provided by a defaulting mechanism rather than
1676 * explicitly provided by the original provider of the security
1677 * descriptor. This may affect the treatment of the SID with respect to
1678 * inheritence of a primary group.
1680 * SE_DACL_PRESENT - This boolean flag, when set, indicates that the security
1681 * descriptor contains a discretionary ACL. If this flag is set and the
1682 * Dacl field of the SECURITY_DESCRIPTOR is null, then a null ACL is
1683 * explicitly being specified.
1685 * SE_DACL_DEFAULTED - This boolean flag, when set, indicates that the ACL
1686 * pointed to by the Dacl field was provided by a defaulting mechanism
1687 * rather than explicitly provided by the original provider of the
1688 * security descriptor. This may affect the treatment of the ACL with
1689 * respect to inheritence of an ACL. This flag is ignored if the
1690 * DaclPresent flag is not set.
1692 * SE_SACL_PRESENT - This boolean flag, when set, indicates that the security
1693 * descriptor contains a system ACL pointed to by the Sacl field. If this
1694 * flag is set and the Sacl field of the SECURITY_DESCRIPTOR is null, then
1695 * an empty (but present) ACL is being specified.
1697 * SE_SACL_DEFAULTED - This boolean flag, when set, indicates that the ACL
1698 * pointed to by the Sacl field was provided by a defaulting mechanism
1699 * rather than explicitly provided by the original provider of the
1700 * security descriptor. This may affect the treatment of the ACL with
1701 * respect to inheritence of an ACL. This flag is ignored if the
1702 * SaclPresent flag is not set.
1704 * SE_SELF_RELATIVE - This boolean flag, when set, indicates that the security
1705 * descriptor is in self-relative form. In this form, all fields of the
1706 * security descriptor are contiguous in memory and all pointer fields are
1707 * expressed as offsets from the beginning of the security descriptor.
1710 SE_OWNER_DEFAULTED = const_cpu_to_le16(0x0001),
1711 SE_GROUP_DEFAULTED = const_cpu_to_le16(0x0002),
1712 SE_DACL_PRESENT = const_cpu_to_le16(0x0004),
1713 SE_DACL_DEFAULTED = const_cpu_to_le16(0x0008),
1715 SE_SACL_PRESENT = const_cpu_to_le16(0x0010),
1716 SE_SACL_DEFAULTED = const_cpu_to_le16(0x0020),
1718 SE_DACL_AUTO_INHERIT_REQ = const_cpu_to_le16(0x0100),
1719 SE_SACL_AUTO_INHERIT_REQ = const_cpu_to_le16(0x0200),
1720 SE_DACL_AUTO_INHERITED = const_cpu_to_le16(0x0400),
1721 SE_SACL_AUTO_INHERITED = const_cpu_to_le16(0x0800),
1723 SE_DACL_PROTECTED = const_cpu_to_le16(0x1000),
1724 SE_SACL_PROTECTED = const_cpu_to_le16(0x2000),
1725 SE_RM_CONTROL_VALID = const_cpu_to_le16(0x4000),
1726 SE_SELF_RELATIVE = const_cpu_to_le16(0x8000)
1727 } __attribute__ ((__packed__));
1729 typedef le16 SECURITY_DESCRIPTOR_CONTROL;
1732 * Self-relative security descriptor. Contains the owner and group SIDs as well
1733 * as the sacl and dacl ACLs inside the security descriptor itself.
1736 u8 revision; /* Revision level of the security descriptor. */
1738 SECURITY_DESCRIPTOR_CONTROL control; /* Flags qualifying the type of
1739 the descriptor as well as the following fields. */
1740 le32 owner; /* Byte offset to a SID representing an object's
1741 owner. If this is NULL, no owner SID is present in
1743 le32 group; /* Byte offset to a SID representing an object's
1744 primary group. If this is NULL, no primary group
1745 SID is present in the descriptor. */
1746 le32 sacl; /* Byte offset to a system ACL. Only valid, if
1747 SE_SACL_PRESENT is set in the control field. If
1748 SE_SACL_PRESENT is set but sacl is NULL, a NULL ACL
1750 le32 dacl; /* Byte offset to a discretionary ACL. Only valid, if
1751 SE_DACL_PRESENT is set in the control field. If
1752 SE_DACL_PRESENT is set but dacl is NULL, a NULL ACL
1753 (unconditionally granting access) is specified. */
1754 /* sizeof() = 0x14 bytes */
1755 } __attribute__ ((__packed__)) SECURITY_DESCRIPTOR_RELATIVE;
1758 * Absolute security descriptor. Does not contain the owner and group SIDs, nor
1759 * the sacl and dacl ACLs inside the security descriptor. Instead, it contains
1760 * pointers to these structures in memory. Obviously, absolute security
1761 * descriptors are only useful for in memory representations of security
1762 * descriptors. On disk, a self-relative security descriptor is used.
1765 u8 revision; /* Revision level of the security descriptor. */
1767 SECURITY_DESCRIPTOR_CONTROL control; /* Flags qualifying the type of
1768 the descriptor as well as the following fields. */
1769 SID *owner; /* Points to a SID representing an object's owner. If
1770 this is NULL, no owner SID is present in the
1772 SID *group; /* Points to a SID representing an object's primary
1773 group. If this is NULL, no primary group SID is
1774 present in the descriptor. */
1775 ACL *sacl; /* Points to a system ACL. Only valid, if
1776 SE_SACL_PRESENT is set in the control field. If
1777 SE_SACL_PRESENT is set but sacl is NULL, a NULL ACL
1779 ACL *dacl; /* Points to a discretionary ACL. Only valid, if
1780 SE_DACL_PRESENT is set in the control field. If
1781 SE_DACL_PRESENT is set but dacl is NULL, a NULL ACL
1782 (unconditionally granting access) is specified. */
1783 } __attribute__ ((__packed__)) SECURITY_DESCRIPTOR;
1786 * Current constants for security descriptors.
1789 /* Current revision. */
1790 SECURITY_DESCRIPTOR_REVISION = 1,
1791 SECURITY_DESCRIPTOR_REVISION1 = 1,
1793 /* The sizes of both the absolute and relative security descriptors is
1794 the same as pointers, at least on ia32 architecture are 32-bit. */
1795 SECURITY_DESCRIPTOR_MIN_LENGTH = sizeof(SECURITY_DESCRIPTOR),
1796 } SECURITY_DESCRIPTOR_CONSTANTS;
1799 * Attribute: Security descriptor (0x50). A standard self-relative security
1802 * NOTE: Can be resident or non-resident.
1803 * NOTE: Not used in NTFS 3.0+, as security descriptors are stored centrally
1804 * in FILE_Secure and the correct descriptor is found using the security_id
1805 * from the standard information attribute.
1807 typedef SECURITY_DESCRIPTOR_RELATIVE SECURITY_DESCRIPTOR_ATTR;
1810 * On NTFS 3.0+, all security descriptors are stored in FILE_Secure. Only one
1811 * referenced instance of each unique security descriptor is stored.
1813 * FILE_Secure contains no unnamed data attribute, i.e. it has zero length. It
1814 * does, however, contain two indexes ($SDH and $SII) as well as a named data
1817 * Every unique security descriptor is assigned a unique security identifier
1818 * (security_id, not to be confused with a SID). The security_id is unique for
1819 * the NTFS volume and is used as an index into the $SII index, which maps
1820 * security_ids to the security descriptor's storage location within the $SDS
1821 * data attribute. The $SII index is sorted by ascending security_id.
1823 * A simple hash is computed from each security descriptor. This hash is used
1824 * as an index into the $SDH index, which maps security descriptor hashes to
1825 * the security descriptor's storage location within the $SDS data attribute.
1826 * The $SDH index is sorted by security descriptor hash and is stored in a B+
1827 * tree. When searching $SDH (with the intent of determining whether or not a
1828 * new security descriptor is already present in the $SDS data stream), if a
1829 * matching hash is found, but the security descriptors do not match, the
1830 * search in the $SDH index is continued, searching for a next matching hash.
1832 * When a precise match is found, the security_id coresponding to the security
1833 * descriptor in the $SDS attribute is read from the found $SDH index entry and
1834 * is stored in the $STANDARD_INFORMATION attribute of the file/directory to
1835 * which the security descriptor is being applied. The $STANDARD_INFORMATION
1836 * attribute is present in all base mft records (i.e. in all files and
1839 * If a match is not found, the security descriptor is assigned a new unique
1840 * security_id and is added to the $SDS data attribute. Then, entries
1841 * referencing the this security descriptor in the $SDS data attribute are
1842 * added to the $SDH and $SII indexes.
1844 * Note: Entries are never deleted from FILE_Secure, even if nothing
1845 * references an entry any more.
1849 * This header precedes each security descriptor in the $SDS data stream.
1850 * This is also the index entry data part of both the $SII and $SDH indexes.
1853 le32 hash; /* Hash of the security descriptor. */
1854 le32 security_id; /* The security_id assigned to the descriptor. */
1855 le64 offset; /* Byte offset of this entry in the $SDS stream. */
1856 le32 length; /* Size in bytes of this entry in $SDS stream. */
1857 } __attribute__ ((__packed__)) SECURITY_DESCRIPTOR_HEADER;
1860 * The $SDS data stream contains the security descriptors, aligned on 16-byte
1861 * boundaries, sorted by security_id in a B+ tree. Security descriptors cannot
1862 * cross 256kib boundaries (this restriction is imposed by the Windows cache
1863 * manager). Each security descriptor is contained in a SDS_ENTRY structure.
1864 * Also, each security descriptor is stored twice in the $SDS stream with a
1865 * fixed offset of 0x40000 bytes (256kib, the Windows cache manager's max size)
1866 * between them; i.e. if a SDS_ENTRY specifies an offset of 0x51d0, then the
1867 * the first copy of the security descriptor will be at offset 0x51d0 in the
1868 * $SDS data stream and the second copy will be at offset 0x451d0.
1872 /* 0 SECURITY_DESCRIPTOR_HEADER; -- Unfolded here as gcc doesn't like
1874 le32 hash; /* Hash of the security descriptor. */
1875 le32 security_id; /* The security_id assigned to the descriptor. */
1876 le64 offset; /* Byte offset of this entry in the $SDS stream. */
1877 le32 length; /* Size in bytes of this entry in $SDS stream. */
1878 /* 20*/ SECURITY_DESCRIPTOR_RELATIVE sid; /* The self-relative security
1880 } __attribute__ ((__packed__)) SDS_ENTRY;
1883 * The index entry key used in the $SII index. The collation type is
1884 * COLLATION_NTOFS_ULONG.
1887 le32 security_id; /* The security_id assigned to the descriptor. */
1888 } __attribute__ ((__packed__)) SII_INDEX_KEY;
1891 * The index entry key used in the $SDH index. The keys are sorted first by
1892 * hash and then by security_id. The collation rule is
1893 * COLLATION_NTOFS_SECURITY_HASH.
1896 le32 hash; /* Hash of the security descriptor. */
1897 le32 security_id; /* The security_id assigned to the descriptor. */
1898 } __attribute__ ((__packed__)) SDH_INDEX_KEY;
1901 * Attribute: Volume name (0x60).
1903 * NOTE: Always resident.
1904 * NOTE: Present only in FILE_Volume.
1907 ntfschar name[0]; /* The name of the volume in Unicode. */
1908 } __attribute__ ((__packed__)) VOLUME_NAME;
1911 * Possible flags for the volume (16-bit).
1914 VOLUME_IS_DIRTY = const_cpu_to_le16(0x0001),
1915 VOLUME_RESIZE_LOG_FILE = const_cpu_to_le16(0x0002),
1916 VOLUME_UPGRADE_ON_MOUNT = const_cpu_to_le16(0x0004),
1917 VOLUME_MOUNTED_ON_NT4 = const_cpu_to_le16(0x0008),
1919 VOLUME_DELETE_USN_UNDERWAY = const_cpu_to_le16(0x0010),
1920 VOLUME_REPAIR_OBJECT_ID = const_cpu_to_le16(0x0020),
1922 VOLUME_CHKDSK_UNDERWAY = const_cpu_to_le16(0x4000),
1923 VOLUME_MODIFIED_BY_CHKDSK = const_cpu_to_le16(0x8000),
1925 VOLUME_FLAGS_MASK = const_cpu_to_le16(0xc03f),
1927 /* To make our life easier when checking if we must mount read-only. */
1928 VOLUME_MUST_MOUNT_RO_MASK = const_cpu_to_le16(0xc027),
1929 } __attribute__ ((__packed__));
1931 typedef le16 VOLUME_FLAGS;
1934 * Attribute: Volume information (0x70).
1936 * NOTE: Always resident.
1937 * NOTE: Present only in FILE_Volume.
1938 * NOTE: Windows 2000 uses NTFS 3.0 while Windows NT4 service pack 6a uses
1939 * NTFS 1.2. I haven't personally seen other values yet.
1942 le64 reserved; /* Not used (yet?). */
1943 u8 major_ver; /* Major version of the ntfs format. */
1944 u8 minor_ver; /* Minor version of the ntfs format. */
1945 VOLUME_FLAGS flags; /* Bit array of VOLUME_* flags. */
1946 } __attribute__ ((__packed__)) VOLUME_INFORMATION;
1949 * Attribute: Data attribute (0x80).
1951 * NOTE: Can be resident or non-resident.
1953 * Data contents of a file (i.e. the unnamed stream) or of a named stream.
1956 u8 data[0]; /* The file's data contents. */
1957 } __attribute__ ((__packed__)) DATA_ATTR;
1960 * Index header flags (8-bit).
1964 * When index header is in an index root attribute:
1966 SMALL_INDEX = 0, /* The index is small enough to fit inside the index
1967 root attribute and there is no index allocation
1968 attribute present. */
1969 LARGE_INDEX = 1, /* The index is too large to fit in the index root
1970 attribute and/or an index allocation attribute is
1973 * When index header is in an index block, i.e. is part of index
1974 * allocation attribute:
1976 LEAF_NODE = 0, /* This is a leaf node, i.e. there are no more nodes
1977 branching off it. */
1978 INDEX_NODE = 1, /* This node indexes other nodes, i.e. it is not a leaf
1980 NODE_MASK = 1, /* Mask for accessing the *_NODE bits. */
1981 } __attribute__ ((__packed__));
1983 typedef u8 INDEX_HEADER_FLAGS;
1986 * This is the header for indexes, describing the INDEX_ENTRY records, which
1987 * follow the INDEX_HEADER. Together the index header and the index entries
1988 * make up a complete index.
1990 * IMPORTANT NOTE: The offset, length and size structure members are counted
1991 * relative to the start of the index header structure and not relative to the
1992 * start of the index root or index allocation structures themselves.
1995 le32 entries_offset; /* Byte offset to first INDEX_ENTRY
1996 aligned to 8-byte boundary. */
1997 le32 index_length; /* Data size of the index in bytes,
1998 i.e. bytes used from allocated
1999 size, aligned to 8-byte boundary. */
2000 le32 allocated_size; /* Byte size of this index (block),
2001 multiple of 8 bytes. */
2002 /* NOTE: For the index root attribute, the above two numbers are always
2003 equal, as the attribute is resident and it is resized as needed. In
2004 the case of the index allocation attribute the attribute is not
2005 resident and hence the allocated_size is a fixed value and must
2006 equal the index_block_size specified by the INDEX_ROOT attribute
2007 corresponding to the INDEX_ALLOCATION attribute this INDEX_BLOCK
2009 INDEX_HEADER_FLAGS flags; /* Bit field of INDEX_HEADER_FLAGS. */
2010 u8 reserved[3]; /* Reserved/align to 8-byte boundary. */
2011 } __attribute__ ((__packed__)) INDEX_HEADER;
2014 * Attribute: Index root (0x90).
2016 * NOTE: Always resident.
2018 * This is followed by a sequence of index entries (INDEX_ENTRY structures)
2019 * as described by the index header.
2021 * When a directory is small enough to fit inside the index root then this
2022 * is the only attribute describing the directory. When the directory is too
2023 * large to fit in the index root, on the other hand, two aditional attributes
2024 * are present: an index allocation attribute, containing sub-nodes of the B+
2025 * directory tree (see below), and a bitmap attribute, describing which virtual
2026 * cluster numbers (vcns) in the index allocation attribute are in use by an
2029 * NOTE: The root directory (FILE_root) contains an entry for itself. Other
2030 * dircetories do not contain entries for themselves, though.
2033 ATTR_TYPE type; /* Type of the indexed attribute. Is
2034 $FILE_NAME for directories, zero
2035 for view indexes. No other values
2037 COLLATION_RULE collation_rule; /* Collation rule used to sort the
2038 index entries. If type is $FILE_NAME,
2039 this must be COLLATION_FILE_NAME. */
2040 le32 index_block_size; /* Size of each index block in bytes (in
2041 the index allocation attribute). */
2042 u8 clusters_per_index_block; /* Cluster size of each index block (in
2043 the index allocation attribute), when
2044 an index block is >= than a cluster,
2045 otherwise this will be the log of
2046 the size (like how the encoding of
2047 the mft record size and the index
2048 record size found in the boot sector
2049 work). Has to be a power of 2. */
2050 u8 reserved[3]; /* Reserved/align to 8-byte boundary. */
2051 INDEX_HEADER index; /* Index header describing the
2052 following index entries. */
2053 } __attribute__ ((__packed__)) INDEX_ROOT;
2056 * Attribute: Index allocation (0xa0).
2058 * NOTE: Always non-resident (doesn't make sense to be resident anyway!).
2060 * This is an array of index blocks. Each index block starts with an
2061 * INDEX_BLOCK structure containing an index header, followed by a sequence of
2062 * index entries (INDEX_ENTRY structures), as described by the INDEX_HEADER.
2065 /* 0 NTFS_RECORD; -- Unfolded here as gcc doesn't like unnamed structs. */
2066 NTFS_RECORD_TYPE magic; /* Magic is "INDX". */
2067 le16 usa_ofs; /* See NTFS_RECORD definition. */
2068 le16 usa_count; /* See NTFS_RECORD definition. */
2070 /* 8*/ sle64 lsn; /* $LogFile sequence number of the last
2071 modification of this index block. */
2072 /* 16*/ leVCN index_block_vcn; /* Virtual cluster number of the index block.
2073 If the cluster_size on the volume is <= the
2074 index_block_size of the directory,
2075 index_block_vcn counts in units of clusters,
2076 and in units of sectors otherwise. */
2077 /* 24*/ INDEX_HEADER index; /* Describes the following index entries. */
2078 /* sizeof()= 40 (0x28) bytes */
2080 * When creating the index block, we place the update sequence array at this
2081 * offset, i.e. before we start with the index entries. This also makes sense,
2082 * otherwise we could run into problems with the update sequence array
2083 * containing in itself the last two bytes of a sector which would mean that
2084 * multi sector transfer protection wouldn't work. As you can't protect data
2085 * by overwriting it since you then can't get it back...
2086 * When reading use the data from the ntfs record header.
2088 } __attribute__ ((__packed__)) INDEX_BLOCK;
2090 typedef INDEX_BLOCK INDEX_ALLOCATION;
2093 * The system file FILE_Extend/$Reparse contains an index named $R listing
2094 * all reparse points on the volume. The index entry keys are as defined
2095 * below. Note, that there is no index data associated with the index entries.
2097 * The index entries are sorted by the index key file_id. The collation rule is
2098 * COLLATION_NTOFS_ULONGS. FIXME: Verify whether the reparse_tag is not the
2099 * primary key / is not a key at all. (AIA)
2102 le32 reparse_tag; /* Reparse point type (inc. flags). */
2103 leMFT_REF file_id; /* Mft record of the file containing the
2104 reparse point attribute. */
2105 } __attribute__ ((__packed__)) REPARSE_INDEX_KEY;
2108 * Quota flags (32-bit).
2110 * The user quota flags. Names explain meaning.
2113 QUOTA_FLAG_DEFAULT_LIMITS = const_cpu_to_le32(0x00000001),
2114 QUOTA_FLAG_LIMIT_REACHED = const_cpu_to_le32(0x00000002),
2115 QUOTA_FLAG_ID_DELETED = const_cpu_to_le32(0x00000004),
2117 QUOTA_FLAG_USER_MASK = const_cpu_to_le32(0x00000007),
2118 /* This is a bit mask for the user quota flags. */
2121 * These flags are only present in the quota defaults index entry, i.e.
2122 * in the entry where owner_id = QUOTA_DEFAULTS_ID.
2124 QUOTA_FLAG_TRACKING_ENABLED = const_cpu_to_le32(0x00000010),
2125 QUOTA_FLAG_ENFORCEMENT_ENABLED = const_cpu_to_le32(0x00000020),
2126 QUOTA_FLAG_TRACKING_REQUESTED = const_cpu_to_le32(0x00000040),
2127 QUOTA_FLAG_LOG_THRESHOLD = const_cpu_to_le32(0x00000080),
2129 QUOTA_FLAG_LOG_LIMIT = const_cpu_to_le32(0x00000100),
2130 QUOTA_FLAG_OUT_OF_DATE = const_cpu_to_le32(0x00000200),
2131 QUOTA_FLAG_CORRUPT = const_cpu_to_le32(0x00000400),
2132 QUOTA_FLAG_PENDING_DELETES = const_cpu_to_le32(0x00000800),
2135 typedef le32 QUOTA_FLAGS;
2138 * The system file FILE_Extend/$Quota contains two indexes $O and $Q. Quotas
2139 * are on a per volume and per user basis.
2141 * The $Q index contains one entry for each existing user_id on the volume. The
2142 * index key is the user_id of the user/group owning this quota control entry,
2143 * i.e. the key is the owner_id. The user_id of the owner of a file, i.e. the
2144 * owner_id, is found in the standard information attribute. The collation rule
2145 * for $Q is COLLATION_NTOFS_ULONG.
2147 * The $O index contains one entry for each user/group who has been assigned
2148 * a quota on that volume. The index key holds the SID of the user_id the
2149 * entry belongs to, i.e. the owner_id. The collation rule for $O is
2150 * COLLATION_NTOFS_SID.
2152 * The $O index entry data is the user_id of the user corresponding to the SID.
2153 * This user_id is used as an index into $Q to find the quota control entry
2154 * associated with the SID.
2156 * The $Q index entry data is the quota control entry and is defined below.
2159 le32 version; /* Currently equals 2. */
2160 QUOTA_FLAGS flags; /* Flags describing this quota entry. */
2161 le64 bytes_used; /* How many bytes of the quota are in use. */
2162 sle64 change_time; /* Last time this quota entry was changed. */
2163 sle64 threshold; /* Soft quota (-1 if not limited). */
2164 sle64 limit; /* Hard quota (-1 if not limited). */
2165 sle64 exceeded_time; /* How long the soft quota has been exceeded. */
2166 SID sid; /* The SID of the user/object associated with
2167 this quota entry. Equals zero for the quota
2168 defaults entry (and in fact on a WinXP
2169 volume, it is not present at all). */
2170 } __attribute__ ((__packed__)) QUOTA_CONTROL_ENTRY;
2173 * Predefined owner_id values (32-bit).
2176 QUOTA_INVALID_ID = const_cpu_to_le32(0x00000000),
2177 QUOTA_DEFAULTS_ID = const_cpu_to_le32(0x00000001),
2178 QUOTA_FIRST_USER_ID = const_cpu_to_le32(0x00000100),
2182 * Current constants for quota control entries.
2185 /* Current version. */
2187 } QUOTA_CONTROL_ENTRY_CONSTANTS;
2190 * Index entry flags (16-bit).
2193 INDEX_ENTRY_NODE = const_cpu_to_le16(1), /* This entry contains a
2194 sub-node, i.e. a reference to an index block in form of
2195 a virtual cluster number (see below). */
2196 INDEX_ENTRY_END = const_cpu_to_le16(2), /* This signifies the last
2197 entry in an index block. The index entry does not
2198 represent a file but it can point to a sub-node. */
2200 INDEX_ENTRY_SPACE_FILLER = const_cpu_to_le16(0xffff), /* gcc: Force
2201 enum bit width to 16-bit. */
2202 } __attribute__ ((__packed__));
2204 typedef le16 INDEX_ENTRY_FLAGS;
2207 * This the index entry header (see below).
2211 struct { /* Only valid when INDEX_ENTRY_END is not set. */
2212 leMFT_REF indexed_file; /* The mft reference of the file
2213 described by this index
2214 entry. Used for directory
2216 } __attribute__ ((__packed__)) dir;
2217 struct { /* Used for views/indexes to find the entry's data. */
2218 le16 data_offset; /* Data byte offset from this
2219 INDEX_ENTRY. Follows the
2221 le16 data_length; /* Data length in bytes. */
2222 le32 reservedV; /* Reserved (zero). */
2223 } __attribute__ ((__packed__)) vi;
2224 } __attribute__ ((__packed__)) data;
2225 /* 8*/ le16 length; /* Byte size of this index entry, multiple of
2227 /* 10*/ le16 key_length; /* Byte size of the key value, which is in the
2228 index entry. It follows field reserved. Not
2229 multiple of 8-bytes. */
2230 /* 12*/ INDEX_ENTRY_FLAGS flags; /* Bit field of INDEX_ENTRY_* flags. */
2231 /* 14*/ le16 reserved; /* Reserved/align to 8-byte boundary. */
2232 /* sizeof() = 16 bytes */
2233 } __attribute__ ((__packed__)) INDEX_ENTRY_HEADER;
2236 * This is an index entry. A sequence of such entries follows each INDEX_HEADER
2237 * structure. Together they make up a complete index. The index follows either
2238 * an index root attribute or an index allocation attribute.
2240 * NOTE: Before NTFS 3.0 only filename attributes were indexed.
2244 /* 0 INDEX_ENTRY_HEADER; -- Unfolded here as gcc dislikes unnamed structs. */
2246 struct { /* Only valid when INDEX_ENTRY_END is not set. */
2247 leMFT_REF indexed_file; /* The mft reference of the file
2248 described by this index
2249 entry. Used for directory
2251 } __attribute__ ((__packed__)) dir;
2252 struct { /* Used for views/indexes to find the entry's data. */
2253 le16 data_offset; /* Data byte offset from this
2254 INDEX_ENTRY. Follows the
2256 le16 data_length; /* Data length in bytes. */
2257 le32 reservedV; /* Reserved (zero). */
2258 } __attribute__ ((__packed__)) vi;
2259 } __attribute__ ((__packed__)) data;
2260 le16 length; /* Byte size of this index entry, multiple of
2262 le16 key_length; /* Byte size of the key value, which is in the
2263 index entry. It follows field reserved. Not
2264 multiple of 8-bytes. */
2265 INDEX_ENTRY_FLAGS flags; /* Bit field of INDEX_ENTRY_* flags. */
2266 le16 reserved; /* Reserved/align to 8-byte boundary. */
2268 /* 16*/ union { /* The key of the indexed attribute. NOTE: Only present
2269 if INDEX_ENTRY_END bit in flags is not set. NOTE: On
2270 NTFS versions before 3.0 the only valid key is the
2271 FILE_NAME_ATTR. On NTFS 3.0+ the following
2272 additional index keys are defined: */
2273 FILE_NAME_ATTR file_name;/* $I30 index in directories. */
2274 SII_INDEX_KEY sii; /* $SII index in $Secure. */
2275 SDH_INDEX_KEY sdh; /* $SDH index in $Secure. */
2276 GUID object_id; /* $O index in FILE_Extend/$ObjId: The
2277 object_id of the mft record found in
2278 the data part of the index. */
2279 REPARSE_INDEX_KEY reparse; /* $R index in
2280 FILE_Extend/$Reparse. */
2281 SID sid; /* $O index in FILE_Extend/$Quota:
2282 SID of the owner of the user_id. */
2283 le32 owner_id; /* $Q index in FILE_Extend/$Quota:
2284 user_id of the owner of the quota
2285 control entry in the data part of
2287 } __attribute__ ((__packed__)) key;
2288 /* The (optional) index data is inserted here when creating. */
2289 // leVCN vcn; /* If INDEX_ENTRY_NODE bit in flags is set, the last
2290 // eight bytes of this index entry contain the virtual
2291 // cluster number of the index block that holds the
2292 // entries immediately preceding the current entry (the
2293 // vcn references the corresponding cluster in the data
2294 // of the non-resident index allocation attribute). If
2295 // the key_length is zero, then the vcn immediately
2296 // follows the INDEX_ENTRY_HEADER. Regardless of
2297 // key_length, the address of the 8-byte boundary
2298 // alligned vcn of INDEX_ENTRY{_HEADER} *ie is given by
2299 // (char*)ie + le16_to_cpu(ie*)->length) - sizeof(VCN),
2300 // where sizeof(VCN) can be hardcoded as 8 if wanted. */
2301 } __attribute__ ((__packed__)) INDEX_ENTRY;
2304 * Attribute: Bitmap (0xb0).
2306 * Contains an array of bits (aka a bitfield).
2308 * When used in conjunction with the index allocation attribute, each bit
2309 * corresponds to one index block within the index allocation attribute. Thus
2310 * the number of bits in the bitmap * index block size / cluster size is the
2311 * number of clusters in the index allocation attribute.
2314 u8 bitmap[0]; /* Array of bits. */
2315 } __attribute__ ((__packed__)) BITMAP_ATTR;
2318 * The reparse point tag defines the type of the reparse point. It also
2319 * includes several flags, which further describe the reparse point.
2321 * The reparse point tag is an unsigned 32-bit value divided in three parts:
2323 * 1. The least significant 16 bits (i.e. bits 0 to 15) specifiy the type of
2324 * the reparse point.
2325 * 2. The 13 bits after this (i.e. bits 16 to 28) are reserved for future use.
2326 * 3. The most significant three bits are flags describing the reparse point.
2327 * They are defined as follows:
2328 * bit 29: Name surrogate bit. If set, the filename is an alias for
2329 * another object in the system.
2330 * bit 30: High-latency bit. If set, accessing the first byte of data will
2331 * be slow. (E.g. the data is stored on a tape drive.)
2332 * bit 31: Microsoft bit. If set, the tag is owned by Microsoft. User
2333 * defined tags have to use zero here.
2335 * These are the predefined reparse point tags:
2338 IO_REPARSE_TAG_IS_ALIAS = const_cpu_to_le32(0x20000000),
2339 IO_REPARSE_TAG_IS_HIGH_LATENCY = const_cpu_to_le32(0x40000000),
2340 IO_REPARSE_TAG_IS_MICROSOFT = const_cpu_to_le32(0x80000000),
2342 IO_REPARSE_TAG_RESERVED_ZERO = const_cpu_to_le32(0x00000000),
2343 IO_REPARSE_TAG_RESERVED_ONE = const_cpu_to_le32(0x00000001),
2344 IO_REPARSE_TAG_RESERVED_RANGE = const_cpu_to_le32(0x00000001),
2346 IO_REPARSE_TAG_NSS = const_cpu_to_le32(0x68000005),
2347 IO_REPARSE_TAG_NSS_RECOVER = const_cpu_to_le32(0x68000006),
2348 IO_REPARSE_TAG_SIS = const_cpu_to_le32(0x68000007),
2349 IO_REPARSE_TAG_DFS = const_cpu_to_le32(0x68000008),
2351 IO_REPARSE_TAG_MOUNT_POINT = const_cpu_to_le32(0x88000003),
2353 IO_REPARSE_TAG_HSM = const_cpu_to_le32(0xa8000004),
2355 IO_REPARSE_TAG_SYMBOLIC_LINK = const_cpu_to_le32(0xe8000000),
2357 IO_REPARSE_TAG_VALID_VALUES = const_cpu_to_le32(0xe000ffff),
2361 * Attribute: Reparse point (0xc0).
2363 * NOTE: Can be resident or non-resident.
2366 le32 reparse_tag; /* Reparse point type (inc. flags). */
2367 le16 reparse_data_length; /* Byte size of reparse data. */
2368 le16 reserved; /* Align to 8-byte boundary. */
2369 u8 reparse_data[0]; /* Meaning depends on reparse_tag. */
2370 } __attribute__ ((__packed__)) REPARSE_POINT;
2373 * Attribute: Extended attribute (EA) information (0xd0).
2375 * NOTE: Always resident. (Is this true???)
2378 le16 ea_length; /* Byte size of the packed extended
2380 le16 need_ea_count; /* The number of extended attributes which have
2381 the NEED_EA bit set. */
2382 le32 ea_query_length; /* Byte size of the buffer required to query
2383 the extended attributes when calling
2384 ZwQueryEaFile() in Windows NT/2k. I.e. the
2385 byte size of the unpacked extended
2387 } __attribute__ ((__packed__)) EA_INFORMATION;
2390 * Extended attribute flags (8-bit).
2393 NEED_EA = 0x80 /* If set the file to which the EA belongs
2394 cannot be interpreted without understanding
2395 the associates extended attributes. */
2396 } __attribute__ ((__packed__));
2398 typedef u8 EA_FLAGS;
2401 * Attribute: Extended attribute (EA) (0xe0).
2403 * NOTE: Can be resident or non-resident.
2405 * Like the attribute list and the index buffer list, the EA attribute value is
2406 * a sequence of EA_ATTR variable length records.
2409 le32 next_entry_offset; /* Offset to the next EA_ATTR. */
2410 EA_FLAGS flags; /* Flags describing the EA. */
2411 u8 ea_name_length; /* Length of the name of the EA in bytes
2412 excluding the '\0' byte terminator. */
2413 le16 ea_value_length; /* Byte size of the EA's value. */
2414 u8 ea_name[0]; /* Name of the EA. Note this is ASCII, not
2415 Unicode and it is zero terminated. */
2416 u8 ea_value[0]; /* The value of the EA. Immediately follows
2418 } __attribute__ ((__packed__)) EA_ATTR;
2421 * Attribute: Property set (0xf0).
2423 * Intended to support Native Structure Storage (NSS) - a feature removed from
2424 * NTFS 3.0 during beta testing.
2427 /* Irrelevant as feature unused. */
2428 } __attribute__ ((__packed__)) PROPERTY_SET;
2431 * Attribute: Logged utility stream (0x100).
2433 * NOTE: Can be resident or non-resident.
2435 * Operations on this attribute are logged to the journal ($LogFile) like
2436 * normal metadata changes.
2438 * Used by the Encrypting File System (EFS). All encrypted files have this
2439 * attribute with the name $EFS.
2442 /* Can be anything the creator chooses. */
2443 /* EFS uses it as follows: */
2444 // FIXME: Type this info, verifying it along the way. (AIA)
2445 } __attribute__ ((__packed__)) LOGGED_UTILITY_STREAM, EFS_ATTR;
2447 #endif /* _LINUX_NTFS_LAYOUT_H */
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