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>
34 /* The NTFS oem_id "NTFS " */
35 #define magicNTFS cpu_to_le64(0x202020205346544eULL)
38 * Location of bootsector on partition:
39 * The standard NTFS_BOOT_SECTOR is on sector 0 of the partition.
40 * On NT4 and above there is one backup copy of the boot sector to
41 * be found on the last sector of the partition (not normally accessible
42 * from within Windows as the bootsector contained number of sectors
43 * value is one less than the actual value!).
44 * On versions of NT 3.51 and earlier, the backup copy was located at
45 * number of sectors/2 (integer divide), i.e. in the middle of the volume.
49 * BIOS parameter block (bpb) structure.
52 le16 bytes_per_sector; /* Size of a sector in bytes. */
53 u8 sectors_per_cluster; /* Size of a cluster in sectors. */
54 le16 reserved_sectors; /* zero */
56 le16 root_entries; /* zero */
57 le16 sectors; /* zero */
58 u8 media_type; /* 0xf8 = hard disk */
59 le16 sectors_per_fat; /* zero */
60 le16 sectors_per_track; /* irrelevant */
61 le16 heads; /* irrelevant */
62 le32 hidden_sectors; /* zero */
63 le32 large_sectors; /* zero */
64 } __attribute__ ((__packed__)) BIOS_PARAMETER_BLOCK;
67 * NTFS boot sector structure.
70 u8 jump[3]; /* Irrelevant (jump to boot up code).*/
71 le64 oem_id; /* Magic "NTFS ". */
72 BIOS_PARAMETER_BLOCK bpb; /* See BIOS_PARAMETER_BLOCK. */
73 u8 unused[4]; /* zero, NTFS diskedit.exe states that
75 __u8 physical_drive; // 0x80
76 __u8 current_head; // zero
77 __u8 extended_boot_signature;
81 /*0x28*/sle64 number_of_sectors; /* Number of sectors in volume. Gives
82 maximum volume size of 2^63 sectors.
83 Assuming standard sector size of 512
84 bytes, the maximum byte size is
85 approx. 4.7x10^21 bytes. (-; */
86 sle64 mft_lcn; /* Cluster location of mft data. */
87 sle64 mftmirr_lcn; /* Cluster location of copy of mft. */
88 s8 clusters_per_mft_record; /* Mft record size in clusters. */
89 u8 reserved0[3]; /* zero */
90 s8 clusters_per_index_record; /* Index block size in clusters. */
91 u8 reserved1[3]; /* zero */
92 le64 volume_serial_number; /* Irrelevant (serial number). */
93 le32 checksum; /* Boot sector checksum. */
94 /*0x54*/u8 bootstrap[426]; /* Irrelevant (boot up code). */
95 le16 end_of_sector_marker; /* End of bootsector magic. Always is
96 0xaa55 in little endian. */
97 /* sizeof() = 512 (0x200) bytes */
98 } __attribute__ ((__packed__)) NTFS_BOOT_SECTOR;
101 * Magic identifiers present at the beginning of all ntfs record containing
102 * records (like mft records for example).
105 /* Found in $MFT/$DATA. */
106 magic_FILE = cpu_to_le32(0x454c4946), /* Mft entry. */
107 magic_INDX = cpu_to_le32(0x58444e49), /* Index buffer. */
108 magic_HOLE = cpu_to_le32(0x454c4f48), /* ? (NTFS 3.0+?) */
110 /* Found in $LogFile/$DATA. */
111 magic_RSTR = cpu_to_le32(0x52545352), /* Restart page. */
112 magic_RCRD = cpu_to_le32(0x44524352), /* Log record page. */
114 /* Found in $LogFile/$DATA. (May be found in $MFT/$DATA, also?) */
115 magic_CHKD = cpu_to_le32(0x444b4843), /* Modified by chkdsk. */
117 /* Found in all ntfs record containing records. */
118 magic_BAAD = cpu_to_le32(0x44414142), /* Failed multi sector
119 transfer was detected. */
121 * Found in $LogFile/$DATA when a page is full of 0xff bytes and is
122 * thus not initialized. Page must be initialized before using it.
124 magic_empty = cpu_to_le32(0xffffffff) /* Record is empty. */
127 typedef le32 NTFS_RECORD_TYPE;
130 * Generic magic comparison macros. Finally found a use for the ## preprocessor
134 static inline bool __ntfs_is_magic(le32 x, NTFS_RECORD_TYPE r)
138 #define ntfs_is_magic(x, m) __ntfs_is_magic(x, magic_##m)
140 static inline bool __ntfs_is_magicp(le32 *p, NTFS_RECORD_TYPE r)
144 #define ntfs_is_magicp(p, m) __ntfs_is_magicp(p, magic_##m)
147 * Specialised magic comparison macros for the NTFS_RECORD_TYPEs defined above.
149 #define ntfs_is_file_record(x) ( ntfs_is_magic (x, FILE) )
150 #define ntfs_is_file_recordp(p) ( ntfs_is_magicp(p, FILE) )
151 #define ntfs_is_mft_record(x) ( ntfs_is_file_record (x) )
152 #define ntfs_is_mft_recordp(p) ( ntfs_is_file_recordp(p) )
153 #define ntfs_is_indx_record(x) ( ntfs_is_magic (x, INDX) )
154 #define ntfs_is_indx_recordp(p) ( ntfs_is_magicp(p, INDX) )
155 #define ntfs_is_hole_record(x) ( ntfs_is_magic (x, HOLE) )
156 #define ntfs_is_hole_recordp(p) ( ntfs_is_magicp(p, HOLE) )
158 #define ntfs_is_rstr_record(x) ( ntfs_is_magic (x, RSTR) )
159 #define ntfs_is_rstr_recordp(p) ( ntfs_is_magicp(p, RSTR) )
160 #define ntfs_is_rcrd_record(x) ( ntfs_is_magic (x, RCRD) )
161 #define ntfs_is_rcrd_recordp(p) ( ntfs_is_magicp(p, RCRD) )
163 #define ntfs_is_chkd_record(x) ( ntfs_is_magic (x, CHKD) )
164 #define ntfs_is_chkd_recordp(p) ( ntfs_is_magicp(p, CHKD) )
166 #define ntfs_is_baad_record(x) ( ntfs_is_magic (x, BAAD) )
167 #define ntfs_is_baad_recordp(p) ( ntfs_is_magicp(p, BAAD) )
169 #define ntfs_is_empty_record(x) ( ntfs_is_magic (x, empty) )
170 #define ntfs_is_empty_recordp(p) ( ntfs_is_magicp(p, empty) )
173 * The Update Sequence Array (usa) is an array of the le16 values which belong
174 * to the end of each sector protected by the update sequence record in which
175 * this array is contained. Note that the first entry is the Update Sequence
176 * Number (usn), a cyclic counter of how many times the protected record has
177 * been written to disk. The values 0 and -1 (ie. 0xffff) are not used. All
178 * last le16's of each sector have to be equal to the usn (during reading) or
179 * are set to it (during writing). If they are not, an incomplete multi sector
180 * transfer has occurred when the data was written.
181 * The maximum size for the update sequence array is fixed to:
182 * maximum size = usa_ofs + (usa_count * 2) = 510 bytes
183 * The 510 bytes comes from the fact that the last le16 in the array has to
184 * (obviously) finish before the last le16 of the first 512-byte sector.
185 * This formula can be used as a consistency check in that usa_ofs +
186 * (usa_count * 2) has to be less than or equal to 510.
189 NTFS_RECORD_TYPE magic; /* A four-byte magic identifying the record
190 type and/or status. */
191 le16 usa_ofs; /* Offset to the Update Sequence Array (usa)
192 from the start of the ntfs record. */
193 le16 usa_count; /* Number of le16 sized entries in the usa
194 including the Update Sequence Number (usn),
195 thus the number of fixups is the usa_count
197 } __attribute__ ((__packed__)) NTFS_RECORD;
200 * System files mft record numbers. All these files are always marked as used
201 * in the bitmap attribute of the mft; presumably in order to avoid accidental
202 * allocation for random other mft records. Also, the sequence number for each
203 * of the system files is always equal to their mft record number and it is
207 FILE_MFT = 0, /* Master file table (mft). Data attribute
208 contains the entries and bitmap attribute
209 records which ones are in use (bit==1). */
210 FILE_MFTMirr = 1, /* Mft mirror: copy of first four mft records
211 in data attribute. If cluster size > 4kiB,
212 copy of first N mft records, with
213 N = cluster_size / mft_record_size. */
214 FILE_LogFile = 2, /* Journalling log in data attribute. */
215 FILE_Volume = 3, /* Volume name attribute and volume information
216 attribute (flags and ntfs version). Windows
217 refers to this file as volume DASD (Direct
218 Access Storage Device). */
219 FILE_AttrDef = 4, /* Array of attribute definitions in data
221 FILE_root = 5, /* Root directory. */
222 FILE_Bitmap = 6, /* Allocation bitmap of all clusters (lcns) in
224 FILE_Boot = 7, /* Boot sector (always at cluster 0) in data
226 FILE_BadClus = 8, /* Contains all bad clusters in the non-resident
228 FILE_Secure = 9, /* Shared security descriptors in data attribute
229 and two indexes into the descriptors.
230 Appeared in Windows 2000. Before that, this
231 file was named $Quota but was unused. */
232 FILE_UpCase = 10, /* Uppercase equivalents of all 65536 Unicode
233 characters in data attribute. */
234 FILE_Extend = 11, /* Directory containing other system files (eg.
235 $ObjId, $Quota, $Reparse and $UsnJrnl). This
236 is new to NTFS3.0. */
237 FILE_reserved12 = 12, /* Reserved for future use (records 12-15). */
238 FILE_reserved13 = 13,
239 FILE_reserved14 = 14,
240 FILE_reserved15 = 15,
241 FILE_first_user = 16, /* First user file, used as test limit for
242 whether to allow opening a file or not. */
246 * These are the so far known MFT_RECORD_* flags (16-bit) which contain
247 * information about the mft record in which they are present.
250 MFT_RECORD_IN_USE = cpu_to_le16(0x0001),
251 MFT_RECORD_IS_DIRECTORY = cpu_to_le16(0x0002),
252 } __attribute__ ((__packed__));
254 typedef le16 MFT_RECORD_FLAGS;
257 * mft references (aka file references or file record segment references) are
258 * used whenever a structure needs to refer to a record in the mft.
260 * A reference consists of a 48-bit index into the mft and a 16-bit sequence
261 * number used to detect stale references.
263 * For error reporting purposes we treat the 48-bit index as a signed quantity.
265 * The sequence number is a circular counter (skipping 0) describing how many
266 * times the referenced mft record has been (re)used. This has to match the
267 * sequence number of the mft record being referenced, otherwise the reference
268 * is considered stale and removed (FIXME: only ntfsck or the driver itself?).
270 * If the sequence number is zero it is assumed that no sequence number
271 * consistency checking should be performed.
273 * FIXME: Since inodes are 32-bit as of now, the driver needs to always check
274 * for high_part being 0 and if not either BUG(), cause a panic() or handle
275 * the situation in some other way. This shouldn't be a problem as a volume has
276 * to become HUGE in order to need more than 32-bits worth of mft records.
277 * Assuming the standard mft record size of 1kb only the records (never mind
278 * the non-resident attributes, etc.) would require 4Tb of space on their own
279 * for the first 32 bits worth of records. This is only if some strange person
280 * doesn't decide to foul play and make the mft sparse which would be a really
281 * horrible thing to do as it would trash our current driver implementation. )-:
282 * Do I hear screams "we want 64-bit inodes!" ?!? (-;
284 * FIXME: The mft zone is defined as the first 12% of the volume. This space is
285 * reserved so that the mft can grow contiguously and hence doesn't become
286 * fragmented. Volume free space includes the empty part of the mft zone and
287 * when the volume's free 88% are used up, the mft zone is shrunk by a factor
288 * of 2, thus making more space available for more files/data. This process is
289 * repeated everytime there is no more free space except for the mft zone until
290 * there really is no more free space.
294 * Typedef the MFT_REF as a 64-bit value for easier handling.
295 * Also define two unpacking macros to get to the reference (MREF) and
296 * sequence number (MSEQNO) respectively.
297 * The _LE versions are to be applied on little endian MFT_REFs.
298 * Note: The _LE versions will return a CPU endian formatted value!
300 #define MFT_REF_MASK_CPU 0x0000ffffffffffffULL
301 #define MFT_REF_MASK_LE cpu_to_le64(MFT_REF_MASK_CPU)
304 typedef le64 leMFT_REF;
306 #define MK_MREF(m, s) ((MFT_REF)(((MFT_REF)(s) << 48) | \
307 ((MFT_REF)(m) & MFT_REF_MASK_CPU)))
308 #define MK_LE_MREF(m, s) cpu_to_le64(MK_MREF(m, s))
310 #define MREF(x) ((unsigned long)((x) & MFT_REF_MASK_CPU))
311 #define MSEQNO(x) ((u16)(((x) >> 48) & 0xffff))
312 #define MREF_LE(x) ((unsigned long)(le64_to_cpu(x) & MFT_REF_MASK_CPU))
313 #define MSEQNO_LE(x) ((u16)((le64_to_cpu(x) >> 48) & 0xffff))
315 #define IS_ERR_MREF(x) (((x) & 0x0000800000000000ULL) ? true : false)
316 #define ERR_MREF(x) ((u64)((s64)(x)))
317 #define MREF_ERR(x) ((int)((s64)(x)))
320 * The mft record header present at the beginning of every record in the mft.
321 * This is followed by a sequence of variable length attribute records which
322 * is terminated by an attribute of type AT_END which is a truncated attribute
323 * in that it only consists of the attribute type code AT_END and none of the
324 * other members of the attribute structure are present.
328 /* 0 NTFS_RECORD; -- Unfolded here as gcc doesn't like unnamed structs. */
329 NTFS_RECORD_TYPE magic; /* Usually the magic is "FILE". */
330 le16 usa_ofs; /* See NTFS_RECORD definition above. */
331 le16 usa_count; /* See NTFS_RECORD definition above. */
333 /* 8*/ le64 lsn; /* $LogFile sequence number for this record.
334 Changed every time the record is modified. */
335 /* 16*/ le16 sequence_number; /* Number of times this mft record has been
336 reused. (See description for MFT_REF
337 above.) NOTE: The increment (skipping zero)
338 is done when the file is deleted. NOTE: If
339 this is zero it is left zero. */
340 /* 18*/ le16 link_count; /* Number of hard links, i.e. the number of
341 directory entries referencing this record.
342 NOTE: Only used in mft base records.
343 NOTE: When deleting a directory entry we
344 check the link_count and if it is 1 we
345 delete the file. Otherwise we delete the
346 FILE_NAME_ATTR being referenced by the
347 directory entry from the mft record and
348 decrement the link_count.
349 FIXME: Careful with Win32 + DOS names! */
350 /* 20*/ le16 attrs_offset; /* Byte offset to the first attribute in this
351 mft record from the start of the mft record.
352 NOTE: Must be aligned to 8-byte boundary. */
353 /* 22*/ MFT_RECORD_FLAGS flags; /* Bit array of MFT_RECORD_FLAGS. When a file
354 is deleted, the MFT_RECORD_IN_USE flag is
356 /* 24*/ le32 bytes_in_use; /* Number of bytes used in this mft record.
357 NOTE: Must be aligned to 8-byte boundary. */
358 /* 28*/ le32 bytes_allocated; /* Number of bytes allocated for this mft
359 record. This should be equal to the mft
361 /* 32*/ leMFT_REF base_mft_record;/* This is zero for base mft records.
362 When it is not zero it is a mft reference
363 pointing to the base mft record to which
364 this record belongs (this is then used to
365 locate the attribute list attribute present
366 in the base record which describes this
367 extension record and hence might need
368 modification when the extension record
369 itself is modified, also locating the
370 attribute list also means finding the other
371 potential extents, belonging to the non-base
373 /* 40*/ le16 next_attr_instance;/* The instance number that will be assigned to
374 the next attribute added to this mft record.
375 NOTE: Incremented each time after it is used.
376 NOTE: Every time the mft record is reused
377 this number is set to zero. NOTE: The first
378 instance number is always 0. */
379 /* The below fields are specific to NTFS 3.1+ (Windows XP and above): */
380 /* 42*/ le16 reserved; /* Reserved/alignment. */
381 /* 44*/ le32 mft_record_number; /* Number of this mft record. */
382 /* sizeof() = 48 bytes */
384 * When (re)using the mft record, we place the update sequence array at this
385 * offset, i.e. before we start with the attributes. This also makes sense,
386 * otherwise we could run into problems with the update sequence array
387 * containing in itself the last two bytes of a sector which would mean that
388 * multi sector transfer protection wouldn't work. As you can't protect data
389 * by overwriting it since you then can't get it back...
390 * When reading we obviously use the data from the ntfs record header.
392 } __attribute__ ((__packed__)) MFT_RECORD;
394 /* This is the version without the NTFS 3.1+ specific fields. */
397 /* 0 NTFS_RECORD; -- Unfolded here as gcc doesn't like unnamed structs. */
398 NTFS_RECORD_TYPE magic; /* Usually the magic is "FILE". */
399 le16 usa_ofs; /* See NTFS_RECORD definition above. */
400 le16 usa_count; /* See NTFS_RECORD definition above. */
402 /* 8*/ le64 lsn; /* $LogFile sequence number for this record.
403 Changed every time the record is modified. */
404 /* 16*/ le16 sequence_number; /* Number of times this mft record has been
405 reused. (See description for MFT_REF
406 above.) NOTE: The increment (skipping zero)
407 is done when the file is deleted. NOTE: If
408 this is zero it is left zero. */
409 /* 18*/ le16 link_count; /* Number of hard links, i.e. the number of
410 directory entries referencing this record.
411 NOTE: Only used in mft base records.
412 NOTE: When deleting a directory entry we
413 check the link_count and if it is 1 we
414 delete the file. Otherwise we delete the
415 FILE_NAME_ATTR being referenced by the
416 directory entry from the mft record and
417 decrement the link_count.
418 FIXME: Careful with Win32 + DOS names! */
419 /* 20*/ le16 attrs_offset; /* Byte offset to the first attribute in this
420 mft record from the start of the mft record.
421 NOTE: Must be aligned to 8-byte boundary. */
422 /* 22*/ MFT_RECORD_FLAGS flags; /* Bit array of MFT_RECORD_FLAGS. When a file
423 is deleted, the MFT_RECORD_IN_USE flag is
425 /* 24*/ le32 bytes_in_use; /* Number of bytes used in this mft record.
426 NOTE: Must be aligned to 8-byte boundary. */
427 /* 28*/ le32 bytes_allocated; /* Number of bytes allocated for this mft
428 record. This should be equal to the mft
430 /* 32*/ leMFT_REF base_mft_record;/* This is zero for base mft records.
431 When it is not zero it is a mft reference
432 pointing to the base mft record to which
433 this record belongs (this is then used to
434 locate the attribute list attribute present
435 in the base record which describes this
436 extension record and hence might need
437 modification when the extension record
438 itself is modified, also locating the
439 attribute list also means finding the other
440 potential extents, belonging to the non-base
442 /* 40*/ le16 next_attr_instance;/* The instance number that will be assigned to
443 the next attribute added to this mft record.
444 NOTE: Incremented each time after it is used.
445 NOTE: Every time the mft record is reused
446 this number is set to zero. NOTE: The first
447 instance number is always 0. */
448 /* sizeof() = 42 bytes */
450 * When (re)using the mft record, we place the update sequence array at this
451 * offset, i.e. before we start with the attributes. This also makes sense,
452 * otherwise we could run into problems with the update sequence array
453 * containing in itself the last two bytes of a sector which would mean that
454 * multi sector transfer protection wouldn't work. As you can't protect data
455 * by overwriting it since you then can't get it back...
456 * When reading we obviously use the data from the ntfs record header.
458 } __attribute__ ((__packed__)) MFT_RECORD_OLD;
461 * System defined attributes (32-bit). Each attribute type has a corresponding
462 * attribute name (Unicode string of maximum 64 character length) as described
463 * by the attribute definitions present in the data attribute of the $AttrDef
464 * system file. On NTFS 3.0 volumes the names are just as the types are named
465 * in the below defines exchanging AT_ for the dollar sign ($). If that is not
466 * a revealing choice of symbol I do not know what is... (-;
469 AT_UNUSED = cpu_to_le32( 0),
470 AT_STANDARD_INFORMATION = cpu_to_le32( 0x10),
471 AT_ATTRIBUTE_LIST = cpu_to_le32( 0x20),
472 AT_FILE_NAME = cpu_to_le32( 0x30),
473 AT_OBJECT_ID = cpu_to_le32( 0x40),
474 AT_SECURITY_DESCRIPTOR = cpu_to_le32( 0x50),
475 AT_VOLUME_NAME = cpu_to_le32( 0x60),
476 AT_VOLUME_INFORMATION = cpu_to_le32( 0x70),
477 AT_DATA = cpu_to_le32( 0x80),
478 AT_INDEX_ROOT = cpu_to_le32( 0x90),
479 AT_INDEX_ALLOCATION = cpu_to_le32( 0xa0),
480 AT_BITMAP = cpu_to_le32( 0xb0),
481 AT_REPARSE_POINT = cpu_to_le32( 0xc0),
482 AT_EA_INFORMATION = cpu_to_le32( 0xd0),
483 AT_EA = cpu_to_le32( 0xe0),
484 AT_PROPERTY_SET = cpu_to_le32( 0xf0),
485 AT_LOGGED_UTILITY_STREAM = cpu_to_le32( 0x100),
486 AT_FIRST_USER_DEFINED_ATTRIBUTE = cpu_to_le32( 0x1000),
487 AT_END = cpu_to_le32(0xffffffff)
490 typedef le32 ATTR_TYPE;
493 * The collation rules for sorting views/indexes/etc (32-bit).
495 * COLLATION_BINARY - Collate by binary compare where the first byte is most
497 * COLLATION_UNICODE_STRING - Collate Unicode strings by comparing their binary
498 * Unicode values, except that when a character can be uppercased, the
499 * upper case value collates before the lower case one.
500 * COLLATION_FILE_NAME - Collate file names as Unicode strings. The collation
501 * is done very much like COLLATION_UNICODE_STRING. In fact I have no idea
502 * what the difference is. Perhaps the difference is that file names
503 * would treat some special characters in an odd way (see
504 * unistr.c::ntfs_collate_names() and unistr.c::legal_ansi_char_array[]
505 * for what I mean but COLLATION_UNICODE_STRING would not give any special
506 * treatment to any characters at all, but this is speculation.
507 * COLLATION_NTOFS_ULONG - Sorting is done according to ascending le32 key
508 * values. E.g. used for $SII index in FILE_Secure, which sorts by
509 * security_id (le32).
510 * COLLATION_NTOFS_SID - Sorting is done according to ascending SID values.
511 * E.g. used for $O index in FILE_Extend/$Quota.
512 * COLLATION_NTOFS_SECURITY_HASH - Sorting is done first by ascending hash
513 * values and second by ascending security_id values. E.g. used for $SDH
514 * index in FILE_Secure.
515 * COLLATION_NTOFS_ULONGS - Sorting is done according to a sequence of ascending
516 * le32 key values. E.g. used for $O index in FILE_Extend/$ObjId, which
517 * sorts by object_id (16-byte), by splitting up the object_id in four
518 * le32 values and using them as individual keys. E.g. take the following
519 * two security_ids, stored as follows on disk:
520 * 1st: a1 61 65 b7 65 7b d4 11 9e 3d 00 e0 81 10 42 59
521 * 2nd: 38 14 37 d2 d2 f3 d4 11 a5 21 c8 6b 79 b1 97 45
522 * To compare them, they are split into four le32 values each, like so:
523 * 1st: 0xb76561a1 0x11d47b65 0xe0003d9e 0x59421081
524 * 2nd: 0xd2371438 0x11d4f3d2 0x6bc821a5 0x4597b179
525 * Now, it is apparent why the 2nd object_id collates after the 1st: the
526 * first le32 value of the 1st object_id is less than the first le32 of
527 * the 2nd object_id. If the first le32 values of both object_ids were
528 * equal then the second le32 values would be compared, etc.
531 COLLATION_BINARY = cpu_to_le32(0x00),
532 COLLATION_FILE_NAME = cpu_to_le32(0x01),
533 COLLATION_UNICODE_STRING = cpu_to_le32(0x02),
534 COLLATION_NTOFS_ULONG = cpu_to_le32(0x10),
535 COLLATION_NTOFS_SID = cpu_to_le32(0x11),
536 COLLATION_NTOFS_SECURITY_HASH = cpu_to_le32(0x12),
537 COLLATION_NTOFS_ULONGS = cpu_to_le32(0x13),
540 typedef le32 COLLATION_RULE;
543 * The flags (32-bit) describing attribute properties in the attribute
544 * definition structure. FIXME: This information is based on Regis's
545 * information and, according to him, it is not certain and probably
546 * incomplete. The INDEXABLE flag is fairly certainly correct as only the file
547 * name attribute has this flag set and this is the only attribute indexed in
551 ATTR_DEF_INDEXABLE = cpu_to_le32(0x02), /* Attribute can be
553 ATTR_DEF_MULTIPLE = cpu_to_le32(0x04), /* Attribute type
554 can be present multiple times in the
555 mft records of an inode. */
556 ATTR_DEF_NOT_ZERO = cpu_to_le32(0x08), /* Attribute value
557 must contain at least one non-zero
559 ATTR_DEF_INDEXED_UNIQUE = cpu_to_le32(0x10), /* Attribute must be
560 indexed and the attribute value must be
561 unique for the attribute type in all of
562 the mft records of an inode. */
563 ATTR_DEF_NAMED_UNIQUE = cpu_to_le32(0x20), /* Attribute must be
564 named and the name must be unique for
565 the attribute type in all of the mft
566 records of an inode. */
567 ATTR_DEF_RESIDENT = cpu_to_le32(0x40), /* Attribute must be
569 ATTR_DEF_ALWAYS_LOG = cpu_to_le32(0x80), /* Always log
570 modifications to this attribute,
571 regardless of whether it is resident or
572 non-resident. Without this, only log
573 modifications if the attribute is
577 typedef le32 ATTR_DEF_FLAGS;
580 * The data attribute of FILE_AttrDef contains a sequence of attribute
581 * definitions for the NTFS volume. With this, it is supposed to be safe for an
582 * older NTFS driver to mount a volume containing a newer NTFS version without
583 * damaging it (that's the theory. In practice it's: not damaging it too much).
584 * Entries are sorted by attribute type. The flags describe whether the
585 * attribute can be resident/non-resident and possibly other things, but the
586 * actual bits are unknown.
590 /* 0*/ ntfschar name[0x40]; /* Unicode name of the attribute. Zero
592 /* 80*/ ATTR_TYPE type; /* Type of the attribute. */
593 /* 84*/ le32 display_rule; /* Default display rule.
594 FIXME: What does it mean? (AIA) */
595 /* 88*/ COLLATION_RULE collation_rule; /* Default collation rule. */
596 /* 8c*/ ATTR_DEF_FLAGS flags; /* Flags describing the attribute. */
597 /* 90*/ sle64 min_size; /* Optional minimum attribute size. */
598 /* 98*/ sle64 max_size; /* Maximum size of attribute. */
599 /* sizeof() = 0xa0 or 160 bytes */
600 } __attribute__ ((__packed__)) ATTR_DEF;
603 * Attribute flags (16-bit).
606 ATTR_IS_COMPRESSED = cpu_to_le16(0x0001),
607 ATTR_COMPRESSION_MASK = cpu_to_le16(0x00ff), /* Compression method
610 ATTR_IS_ENCRYPTED = cpu_to_le16(0x4000),
611 ATTR_IS_SPARSE = cpu_to_le16(0x8000),
612 } __attribute__ ((__packed__));
614 typedef le16 ATTR_FLAGS;
617 * Attribute compression.
619 * Only the data attribute is ever compressed in the current ntfs driver in
620 * Windows. Further, compression is only applied when the data attribute is
621 * non-resident. Finally, to use compression, the maximum allowed cluster size
622 * on a volume is 4kib.
624 * The compression method is based on independently compressing blocks of X
625 * clusters, where X is determined from the compression_unit value found in the
626 * non-resident attribute record header (more precisely: X = 2^compression_unit
627 * clusters). On Windows NT/2k, X always is 16 clusters (compression_unit = 4).
629 * There are three different cases of how a compression block of X clusters
632 * 1) The data in the block is all zero (a sparse block):
633 * This is stored as a sparse block in the runlist, i.e. the runlist
634 * entry has length = X and lcn = -1. The mapping pairs array actually
635 * uses a delta_lcn value length of 0, i.e. delta_lcn is not present at
636 * all, which is then interpreted by the driver as lcn = -1.
637 * NOTE: Even uncompressed files can be sparse on NTFS 3.0 volumes, then
638 * the same principles apply as above, except that the length is not
639 * restricted to being any particular value.
641 * 2) The data in the block is not compressed:
642 * This happens when compression doesn't reduce the size of the block
643 * in clusters. I.e. if compression has a small effect so that the
644 * compressed data still occupies X clusters, then the uncompressed data
645 * is stored in the block.
646 * This case is recognised by the fact that the runlist entry has
647 * length = X and lcn >= 0. The mapping pairs array stores this as
648 * normal with a run length of X and some specific delta_lcn, i.e.
649 * delta_lcn has to be present.
651 * 3) The data in the block is compressed:
652 * The common case. This case is recognised by the fact that the run
653 * list entry has length L < X and lcn >= 0. The mapping pairs array
654 * stores this as normal with a run length of X and some specific
655 * delta_lcn, i.e. delta_lcn has to be present. This runlist entry is
656 * immediately followed by a sparse entry with length = X - L and
657 * lcn = -1. The latter entry is to make up the vcn counting to the
658 * full compression block size X.
660 * In fact, life is more complicated because adjacent entries of the same type
661 * can be coalesced. This means that one has to keep track of the number of
662 * clusters handled and work on a basis of X clusters at a time being one
663 * block. An example: if length L > X this means that this particular runlist
664 * entry contains a block of length X and part of one or more blocks of length
665 * L - X. Another example: if length L < X, this does not necessarily mean that
666 * the block is compressed as it might be that the lcn changes inside the block
667 * and hence the following runlist entry describes the continuation of the
668 * potentially compressed block. The block would be compressed if the
669 * following runlist entry describes at least X - L sparse clusters, thus
670 * making up the compression block length as described in point 3 above. (Of
671 * course, there can be several runlist entries with small lengths so that the
672 * sparse entry does not follow the first data containing entry with
675 * NOTE: At the end of the compressed attribute value, there most likely is not
676 * just the right amount of data to make up a compression block, thus this data
677 * is not even attempted to be compressed. It is just stored as is, unless
678 * the number of clusters it occupies is reduced when compressed in which case
679 * it is stored as a compressed compression block, complete with sparse
680 * clusters at the end.
684 * Flags of resident attributes (8-bit).
687 RESIDENT_ATTR_IS_INDEXED = 0x01, /* Attribute is referenced in an index
688 (has implications for deleting and
689 modifying the attribute). */
690 } __attribute__ ((__packed__));
692 typedef u8 RESIDENT_ATTR_FLAGS;
695 * Attribute record header. Always aligned to 8-byte boundary.
699 /* 0*/ ATTR_TYPE type; /* The (32-bit) type of the attribute. */
700 /* 4*/ le32 length; /* Byte size of the resident part of the
701 attribute (aligned to 8-byte boundary).
702 Used to get to the next attribute. */
703 /* 8*/ u8 non_resident; /* If 0, attribute is resident.
704 If 1, attribute is non-resident. */
705 /* 9*/ u8 name_length; /* Unicode character size of name of attribute.
707 /* 10*/ le16 name_offset; /* If name_length != 0, the byte offset to the
708 beginning of the name from the attribute
709 record. Note that the name is stored as a
710 Unicode string. When creating, place offset
711 just at the end of the record header. Then,
712 follow with attribute value or mapping pairs
713 array, resident and non-resident attributes
714 respectively, aligning to an 8-byte
716 /* 12*/ ATTR_FLAGS flags; /* Flags describing the attribute. */
717 /* 14*/ le16 instance; /* The instance of this attribute record. This
718 number is unique within this mft record (see
719 MFT_RECORD/next_attribute_instance notes in
720 in mft.h for more details). */
722 /* Resident attributes. */
724 /* 16 */ le32 value_length;/* Byte size of attribute value. */
725 /* 20 */ le16 value_offset;/* Byte offset of the attribute
726 value from the start of the
727 attribute record. When creating,
728 align to 8-byte boundary if we
729 have a name present as this might
730 not have a length of a multiple
732 /* 22 */ RESIDENT_ATTR_FLAGS flags; /* See above. */
733 /* 23 */ s8 reserved; /* Reserved/alignment to 8-byte
735 } __attribute__ ((__packed__)) resident;
736 /* Non-resident attributes. */
738 /* 16*/ leVCN lowest_vcn;/* Lowest valid virtual cluster number
739 for this portion of the attribute value or
740 0 if this is the only extent (usually the
741 case). - Only when an attribute list is used
742 does lowest_vcn != 0 ever occur. */
743 /* 24*/ leVCN highest_vcn;/* Highest valid vcn of this extent of
744 the attribute value. - Usually there is only one
745 portion, so this usually equals the attribute
746 value size in clusters minus 1. Can be -1 for
747 zero length files. Can be 0 for "single extent"
749 /* 32*/ le16 mapping_pairs_offset; /* Byte offset from the
750 beginning of the structure to the mapping pairs
751 array which contains the mappings between the
752 vcns and the logical cluster numbers (lcns).
753 When creating, place this at the end of this
754 record header aligned to 8-byte boundary. */
755 /* 34*/ u8 compression_unit; /* The compression unit expressed
756 as the log to the base 2 of the number of
757 clusters in a compression unit. 0 means not
758 compressed. (This effectively limits the
759 compression unit size to be a power of two
760 clusters.) WinNT4 only uses a value of 4.
761 Sparse files have this set to 0 on XPSP2. */
762 /* 35*/ u8 reserved[5]; /* Align to 8-byte boundary. */
763 /* The sizes below are only used when lowest_vcn is zero, as otherwise it would
764 be difficult to keep them up-to-date.*/
765 /* 40*/ sle64 allocated_size; /* Byte size of disk space
766 allocated to hold the attribute value. Always
767 is a multiple of the cluster size. When a file
768 is compressed, this field is a multiple of the
769 compression block size (2^compression_unit) and
770 it represents the logically allocated space
771 rather than the actual on disk usage. For this
772 use the compressed_size (see below). */
773 /* 48*/ sle64 data_size; /* Byte size of the attribute
774 value. Can be larger than allocated_size if
775 attribute value is compressed or sparse. */
776 /* 56*/ sle64 initialized_size; /* Byte size of initialized
777 portion of the attribute value. Usually equals
779 /* sizeof(uncompressed attr) = 64*/
780 /* 64*/ sle64 compressed_size; /* Byte size of the attribute
781 value after compression. Only present when
782 compressed or sparse. Always is a multiple of
783 the cluster size. Represents the actual amount
784 of disk space being used on the disk. */
785 /* sizeof(compressed attr) = 72*/
786 } __attribute__ ((__packed__)) non_resident;
787 } __attribute__ ((__packed__)) data;
788 } __attribute__ ((__packed__)) ATTR_RECORD;
790 typedef ATTR_RECORD ATTR_REC;
793 * File attribute flags (32-bit) appearing in the file_attributes fields of the
794 * STANDARD_INFORMATION attribute of MFT_RECORDs and the FILENAME_ATTR
795 * attributes of MFT_RECORDs and directory index entries.
797 * All of the below flags appear in the directory index entries but only some
798 * appear in the STANDARD_INFORMATION attribute whilst only some others appear
799 * in the FILENAME_ATTR attribute of MFT_RECORDs. Unless otherwise stated the
800 * flags appear in all of the above.
803 FILE_ATTR_READONLY = cpu_to_le32(0x00000001),
804 FILE_ATTR_HIDDEN = cpu_to_le32(0x00000002),
805 FILE_ATTR_SYSTEM = cpu_to_le32(0x00000004),
806 /* Old DOS volid. Unused in NT. = cpu_to_le32(0x00000008), */
808 FILE_ATTR_DIRECTORY = cpu_to_le32(0x00000010),
809 /* Note, FILE_ATTR_DIRECTORY is not considered valid in NT. It is
810 reserved for the DOS SUBDIRECTORY flag. */
811 FILE_ATTR_ARCHIVE = cpu_to_le32(0x00000020),
812 FILE_ATTR_DEVICE = cpu_to_le32(0x00000040),
813 FILE_ATTR_NORMAL = cpu_to_le32(0x00000080),
815 FILE_ATTR_TEMPORARY = cpu_to_le32(0x00000100),
816 FILE_ATTR_SPARSE_FILE = cpu_to_le32(0x00000200),
817 FILE_ATTR_REPARSE_POINT = cpu_to_le32(0x00000400),
818 FILE_ATTR_COMPRESSED = cpu_to_le32(0x00000800),
820 FILE_ATTR_OFFLINE = cpu_to_le32(0x00001000),
821 FILE_ATTR_NOT_CONTENT_INDEXED = cpu_to_le32(0x00002000),
822 FILE_ATTR_ENCRYPTED = cpu_to_le32(0x00004000),
824 FILE_ATTR_VALID_FLAGS = cpu_to_le32(0x00007fb7),
825 /* Note, FILE_ATTR_VALID_FLAGS masks out the old DOS VolId and the
826 FILE_ATTR_DEVICE and preserves everything else. This mask is used
827 to obtain all flags that are valid for reading. */
828 FILE_ATTR_VALID_SET_FLAGS = cpu_to_le32(0x000031a7),
829 /* Note, FILE_ATTR_VALID_SET_FLAGS masks out the old DOS VolId, the
830 F_A_DEVICE, F_A_DIRECTORY, F_A_SPARSE_FILE, F_A_REPARSE_POINT,
831 F_A_COMPRESSED, and F_A_ENCRYPTED and preserves the rest. This mask
832 is used to to obtain all flags that are valid for setting. */
834 * The flag FILE_ATTR_DUP_FILENAME_INDEX_PRESENT is present in all
835 * FILENAME_ATTR attributes but not in the STANDARD_INFORMATION
836 * attribute of an mft record.
838 FILE_ATTR_DUP_FILE_NAME_INDEX_PRESENT = cpu_to_le32(0x10000000),
839 /* Note, this is a copy of the corresponding bit from the mft record,
840 telling us whether this is a directory or not, i.e. whether it has
841 an index root attribute or not. */
842 FILE_ATTR_DUP_VIEW_INDEX_PRESENT = cpu_to_le32(0x20000000),
843 /* Note, this is a copy of the corresponding bit from the mft record,
844 telling us whether this file has a view index present (eg. object id
845 index, quota index, one of the security indexes or the encrypting
846 filesystem related indexes). */
849 typedef le32 FILE_ATTR_FLAGS;
852 * NOTE on times in NTFS: All times are in MS standard time format, i.e. they
853 * are the number of 100-nanosecond intervals since 1st January 1601, 00:00:00
854 * universal coordinated time (UTC). (In Linux time starts 1st January 1970,
855 * 00:00:00 UTC and is stored as the number of 1-second intervals since then.)
859 * Attribute: Standard information (0x10).
861 * NOTE: Always resident.
862 * NOTE: Present in all base file records on a volume.
863 * NOTE: There is conflicting information about the meaning of each of the time
864 * fields but the meaning as defined below has been verified to be
865 * correct by practical experimentation on Windows NT4 SP6a and is hence
866 * assumed to be the one and only correct interpretation.
870 /* 0*/ sle64 creation_time; /* Time file was created. Updated when
871 a filename is changed(?). */
872 /* 8*/ sle64 last_data_change_time; /* Time the data attribute was last
874 /* 16*/ sle64 last_mft_change_time; /* Time this mft record was last
876 /* 24*/ sle64 last_access_time; /* Approximate time when the file was
877 last accessed (obviously this is not
878 updated on read-only volumes). In
879 Windows this is only updated when
880 accessed if some time delta has
881 passed since the last update. Also,
882 last access time updates can be
883 disabled altogether for speed. */
884 /* 32*/ FILE_ATTR_FLAGS file_attributes; /* Flags describing the file. */
888 /* 36*/ u8 reserved12[12]; /* Reserved/alignment to 8-byte
890 } __attribute__ ((__packed__)) v1;
891 /* sizeof() = 48 bytes */
895 * If a volume has been upgraded from a previous NTFS version, then these
896 * fields are present only if the file has been accessed since the upgrade.
897 * Recognize the difference by comparing the length of the resident attribute
898 * value. If it is 48, then the following fields are missing. If it is 72 then
899 * the fields are present. Maybe just check like this:
900 * if (resident.ValueLength < sizeof(STANDARD_INFORMATION)) {
901 * Assume NTFS 1.2- format.
902 * If (volume version is 3.x)
903 * Upgrade attribute to NTFS 3.x format.
905 * Use NTFS 1.2- format for access.
907 * Use NTFS 3.x format for access.
908 * Only problem is that it might be legal to set the length of the value to
909 * arbitrarily large values thus spoiling this check. - But chkdsk probably
910 * views that as a corruption, assuming that it behaves like this for all
913 /* 36*/ le32 maximum_versions; /* Maximum allowed versions for
914 file. Zero if version numbering is disabled. */
915 /* 40*/ le32 version_number; /* This file's version (if any).
916 Set to zero if maximum_versions is zero. */
917 /* 44*/ le32 class_id; /* Class id from bidirectional
918 class id index (?). */
919 /* 48*/ le32 owner_id; /* Owner_id of the user owning
920 the file. Translate via $Q index in FILE_Extend
921 /$Quota to the quota control entry for the user
922 owning the file. Zero if quotas are disabled. */
923 /* 52*/ le32 security_id; /* Security_id for the file.
924 Translate via $SII index and $SDS data stream
925 in FILE_Secure to the security descriptor. */
926 /* 56*/ le64 quota_charged; /* Byte size of the charge to
927 the quota for all streams of the file. Note: Is
928 zero if quotas are disabled. */
929 /* 64*/ leUSN usn; /* Last update sequence number
930 of the file. This is a direct index into the
931 transaction log file ($UsnJrnl). It is zero if
932 the usn journal is disabled or this file has
933 not been subject to logging yet. See usnjrnl.h
935 } __attribute__ ((__packed__)) v3;
936 /* sizeof() = 72 bytes (NTFS 3.x) */
937 } __attribute__ ((__packed__)) ver;
938 } __attribute__ ((__packed__)) STANDARD_INFORMATION;
941 * Attribute: Attribute list (0x20).
943 * - Can be either resident or non-resident.
944 * - Value consists of a sequence of variable length, 8-byte aligned,
945 * ATTR_LIST_ENTRY records.
946 * - The list is not terminated by anything at all! The only way to know when
947 * the end is reached is to keep track of the current offset and compare it to
948 * the attribute value size.
949 * - The attribute list attribute contains one entry for each attribute of
950 * the file in which the list is located, except for the list attribute
951 * itself. The list is sorted: first by attribute type, second by attribute
952 * name (if present), third by instance number. The extents of one
953 * non-resident attribute (if present) immediately follow after the initial
954 * extent. They are ordered by lowest_vcn and have their instace set to zero.
955 * It is not allowed to have two attributes with all sorting keys equal.
956 * - Further restrictions:
957 * - If not resident, the vcn to lcn mapping array has to fit inside the
959 * - The attribute list attribute value has a maximum size of 256kb. This
960 * is imposed by the Windows cache manager.
961 * - Attribute lists are only used when the attributes of mft record do not
962 * fit inside the mft record despite all attributes (that can be made
963 * non-resident) having been made non-resident. This can happen e.g. when:
964 * - File has a large number of hard links (lots of file name
965 * attributes present).
966 * - The mapping pairs array of some non-resident attribute becomes so
967 * large due to fragmentation that it overflows the mft record.
968 * - The security descriptor is very complex (not applicable to
970 * - There are many named streams.
974 /* 0*/ ATTR_TYPE type; /* Type of referenced attribute. */
975 /* 4*/ le16 length; /* Byte size of this entry (8-byte aligned). */
976 /* 6*/ u8 name_length; /* Size in Unicode chars of the name of the
977 attribute or 0 if unnamed. */
978 /* 7*/ u8 name_offset; /* Byte offset to beginning of attribute name
979 (always set this to where the name would
980 start even if unnamed). */
981 /* 8*/ leVCN lowest_vcn; /* Lowest virtual cluster number of this portion
982 of the attribute value. This is usually 0. It
983 is non-zero for the case where one attribute
984 does not fit into one mft record and thus
985 several mft records are allocated to hold
986 this attribute. In the latter case, each mft
987 record holds one extent of the attribute and
988 there is one attribute list entry for each
989 extent. NOTE: This is DEFINITELY a signed
990 value! The windows driver uses cmp, followed
991 by jg when comparing this, thus it treats it
993 /* 16*/ leMFT_REF mft_reference;/* The reference of the mft record holding
994 the ATTR_RECORD for this portion of the
996 /* 24*/ le16 instance; /* If lowest_vcn = 0, the instance of the
997 attribute being referenced; otherwise 0. */
998 /* 26*/ ntfschar name[0]; /* Use when creating only. When reading use
999 name_offset to determine the location of the
1001 /* sizeof() = 26 + (attribute_name_length * 2) bytes */
1002 } __attribute__ ((__packed__)) ATTR_LIST_ENTRY;
1005 * The maximum allowed length for a file name.
1007 #define MAXIMUM_FILE_NAME_LENGTH 255
1010 * Possible namespaces for filenames in ntfs (8-bit).
1013 FILE_NAME_POSIX = 0x00,
1014 /* This is the largest namespace. It is case sensitive and allows all
1015 Unicode characters except for: '\0' and '/'. Beware that in
1016 WinNT/2k/2003 by default files which eg have the same name except
1017 for their case will not be distinguished by the standard utilities
1018 and thus a "del filename" will delete both "filename" and "fileName"
1019 without warning. However if for example Services For Unix (SFU) are
1020 installed and the case sensitive option was enabled at installation
1021 time, then you can create/access/delete such files.
1022 Note that even SFU places restrictions on the filenames beyond the
1023 '\0' and '/' and in particular the following set of characters is
1024 not allowed: '"', '/', '<', '>', '\'. All other characters,
1025 including the ones no allowed in WIN32 namespace are allowed.
1026 Tested with SFU 3.5 (this is now free) running on Windows XP. */
1027 FILE_NAME_WIN32 = 0x01,
1028 /* The standard WinNT/2k NTFS long filenames. Case insensitive. All
1029 Unicode chars except: '\0', '"', '*', '/', ':', '<', '>', '?', '\',
1030 and '|'. Further, names cannot end with a '.' or a space. */
1031 FILE_NAME_DOS = 0x02,
1032 /* The standard DOS filenames (8.3 format). Uppercase only. All 8-bit
1033 characters greater space, except: '"', '*', '+', ',', '/', ':', ';',
1034 '<', '=', '>', '?', and '\'. */
1035 FILE_NAME_WIN32_AND_DOS = 0x03,
1036 /* 3 means that both the Win32 and the DOS filenames are identical and
1037 hence have been saved in this single filename record. */
1038 } __attribute__ ((__packed__));
1040 typedef u8 FILE_NAME_TYPE_FLAGS;
1043 * Attribute: Filename (0x30).
1045 * NOTE: Always resident.
1046 * NOTE: All fields, except the parent_directory, are only updated when the
1047 * filename is changed. Until then, they just become out of sync with
1048 * reality and the more up to date values are present in the standard
1049 * information attribute.
1050 * NOTE: There is conflicting information about the meaning of each of the time
1051 * fields but the meaning as defined below has been verified to be
1052 * correct by practical experimentation on Windows NT4 SP6a and is hence
1053 * assumed to be the one and only correct interpretation.
1057 /* 0*/ leMFT_REF parent_directory; /* Directory this filename is
1059 /* 8*/ sle64 creation_time; /* Time file was created. */
1060 /* 10*/ sle64 last_data_change_time; /* Time the data attribute was last
1062 /* 18*/ sle64 last_mft_change_time; /* Time this mft record was last
1064 /* 20*/ sle64 last_access_time; /* Time this mft record was last
1066 /* 28*/ sle64 allocated_size; /* Byte size of on-disk allocated space
1067 for the unnamed data attribute. So
1068 for normal $DATA, this is the
1069 allocated_size from the unnamed
1070 $DATA attribute and for compressed
1071 and/or sparse $DATA, this is the
1072 compressed_size from the unnamed
1073 $DATA attribute. For a directory or
1074 other inode without an unnamed $DATA
1075 attribute, this is always 0. NOTE:
1076 This is a multiple of the cluster
1078 /* 30*/ sle64 data_size; /* Byte size of actual data in unnamed
1079 data attribute. For a directory or
1080 other inode without an unnamed $DATA
1081 attribute, this is always 0. */
1082 /* 38*/ FILE_ATTR_FLAGS file_attributes; /* Flags describing the file. */
1085 /* 3c*/ le16 packed_ea_size; /* Size of the buffer needed to
1086 pack the extended attributes
1087 (EAs), if such are present.*/
1088 /* 3e*/ le16 reserved; /* Reserved for alignment. */
1089 } __attribute__ ((__packed__)) ea;
1091 /* 3c*/ le32 reparse_point_tag; /* Type of reparse point,
1092 present only in reparse
1093 points and only if there are
1095 } __attribute__ ((__packed__)) rp;
1096 } __attribute__ ((__packed__)) type;
1097 /* 40*/ u8 file_name_length; /* Length of file name in
1098 (Unicode) characters. */
1099 /* 41*/ FILE_NAME_TYPE_FLAGS file_name_type; /* Namespace of the file name.*/
1100 /* 42*/ ntfschar file_name[0]; /* File name in Unicode. */
1101 } __attribute__ ((__packed__)) FILE_NAME_ATTR;
1104 * GUID structures store globally unique identifiers (GUID). A GUID is a
1105 * 128-bit value consisting of one group of eight hexadecimal digits, followed
1106 * by three groups of four hexadecimal digits each, followed by one group of
1107 * twelve hexadecimal digits. GUIDs are Microsoft's implementation of the
1108 * distributed computing environment (DCE) universally unique identifier (UUID).
1109 * Example of a GUID:
1110 * 1F010768-5A73-BC91-0010A52216A7
1113 le32 data1; /* The first eight hexadecimal digits of the GUID. */
1114 le16 data2; /* The first group of four hexadecimal digits. */
1115 le16 data3; /* The second group of four hexadecimal digits. */
1116 u8 data4[8]; /* The first two bytes are the third group of four
1117 hexadecimal digits. The remaining six bytes are the
1118 final 12 hexadecimal digits. */
1119 } __attribute__ ((__packed__)) GUID;
1122 * FILE_Extend/$ObjId contains an index named $O. This index contains all
1123 * object_ids present on the volume as the index keys and the corresponding
1124 * mft_record numbers as the index entry data parts. The data part (defined
1125 * below) also contains three other object_ids:
1126 * birth_volume_id - object_id of FILE_Volume on which the file was first
1127 * created. Optional (i.e. can be zero).
1128 * birth_object_id - object_id of file when it was first created. Usually
1129 * equals the object_id. Optional (i.e. can be zero).
1130 * domain_id - Reserved (always zero).
1133 leMFT_REF mft_reference;/* Mft record containing the object_id in
1134 the index entry key. */
1137 GUID birth_volume_id;
1138 GUID birth_object_id;
1140 } __attribute__ ((__packed__)) origin;
1141 u8 extended_info[48];
1142 } __attribute__ ((__packed__)) opt;
1143 } __attribute__ ((__packed__)) OBJ_ID_INDEX_DATA;
1146 * Attribute: Object id (NTFS 3.0+) (0x40).
1148 * NOTE: Always resident.
1151 GUID object_id; /* Unique id assigned to the
1153 /* The following fields are optional. The attribute value size is 16
1154 bytes, i.e. sizeof(GUID), if these are not present at all. Note,
1155 the entries can be present but one or more (or all) can be zero
1156 meaning that that particular value(s) is(are) not defined. */
1159 GUID birth_volume_id; /* Unique id of volume on which
1160 the file was first created.*/
1161 GUID birth_object_id; /* Unique id of file when it was
1163 GUID domain_id; /* Reserved, zero. */
1164 } __attribute__ ((__packed__)) origin;
1165 u8 extended_info[48];
1166 } __attribute__ ((__packed__)) opt;
1167 } __attribute__ ((__packed__)) OBJECT_ID_ATTR;
1170 * The pre-defined IDENTIFIER_AUTHORITIES used as SID_IDENTIFIER_AUTHORITY in
1171 * the SID structure (see below).
1173 //typedef enum { /* SID string prefix. */
1174 // SECURITY_NULL_SID_AUTHORITY = {0, 0, 0, 0, 0, 0}, /* S-1-0 */
1175 // SECURITY_WORLD_SID_AUTHORITY = {0, 0, 0, 0, 0, 1}, /* S-1-1 */
1176 // SECURITY_LOCAL_SID_AUTHORITY = {0, 0, 0, 0, 0, 2}, /* S-1-2 */
1177 // SECURITY_CREATOR_SID_AUTHORITY = {0, 0, 0, 0, 0, 3}, /* S-1-3 */
1178 // SECURITY_NON_UNIQUE_AUTHORITY = {0, 0, 0, 0, 0, 4}, /* S-1-4 */
1179 // SECURITY_NT_SID_AUTHORITY = {0, 0, 0, 0, 0, 5}, /* S-1-5 */
1180 //} IDENTIFIER_AUTHORITIES;
1183 * These relative identifiers (RIDs) are used with the above identifier
1184 * authorities to make up universal well-known SIDs.
1186 * Note: The relative identifier (RID) refers to the portion of a SID, which
1187 * identifies a user or group in relation to the authority that issued the SID.
1188 * For example, the universal well-known SID Creator Owner ID (S-1-3-0) is
1189 * made up of the identifier authority SECURITY_CREATOR_SID_AUTHORITY (3) and
1190 * the relative identifier SECURITY_CREATOR_OWNER_RID (0).
1192 typedef enum { /* Identifier authority. */
1193 SECURITY_NULL_RID = 0, /* S-1-0 */
1194 SECURITY_WORLD_RID = 0, /* S-1-1 */
1195 SECURITY_LOCAL_RID = 0, /* S-1-2 */
1197 SECURITY_CREATOR_OWNER_RID = 0, /* S-1-3 */
1198 SECURITY_CREATOR_GROUP_RID = 1, /* S-1-3 */
1200 SECURITY_CREATOR_OWNER_SERVER_RID = 2, /* S-1-3 */
1201 SECURITY_CREATOR_GROUP_SERVER_RID = 3, /* S-1-3 */
1203 SECURITY_DIALUP_RID = 1,
1204 SECURITY_NETWORK_RID = 2,
1205 SECURITY_BATCH_RID = 3,
1206 SECURITY_INTERACTIVE_RID = 4,
1207 SECURITY_SERVICE_RID = 6,
1208 SECURITY_ANONYMOUS_LOGON_RID = 7,
1209 SECURITY_PROXY_RID = 8,
1210 SECURITY_ENTERPRISE_CONTROLLERS_RID=9,
1211 SECURITY_SERVER_LOGON_RID = 9,
1212 SECURITY_PRINCIPAL_SELF_RID = 0xa,
1213 SECURITY_AUTHENTICATED_USER_RID = 0xb,
1214 SECURITY_RESTRICTED_CODE_RID = 0xc,
1215 SECURITY_TERMINAL_SERVER_RID = 0xd,
1217 SECURITY_LOGON_IDS_RID = 5,
1218 SECURITY_LOGON_IDS_RID_COUNT = 3,
1220 SECURITY_LOCAL_SYSTEM_RID = 0x12,
1222 SECURITY_NT_NON_UNIQUE = 0x15,
1224 SECURITY_BUILTIN_DOMAIN_RID = 0x20,
1227 * Well-known domain relative sub-authority values (RIDs).
1231 DOMAIN_USER_RID_ADMIN = 0x1f4,
1232 DOMAIN_USER_RID_GUEST = 0x1f5,
1233 DOMAIN_USER_RID_KRBTGT = 0x1f6,
1236 DOMAIN_GROUP_RID_ADMINS = 0x200,
1237 DOMAIN_GROUP_RID_USERS = 0x201,
1238 DOMAIN_GROUP_RID_GUESTS = 0x202,
1239 DOMAIN_GROUP_RID_COMPUTERS = 0x203,
1240 DOMAIN_GROUP_RID_CONTROLLERS = 0x204,
1241 DOMAIN_GROUP_RID_CERT_ADMINS = 0x205,
1242 DOMAIN_GROUP_RID_SCHEMA_ADMINS = 0x206,
1243 DOMAIN_GROUP_RID_ENTERPRISE_ADMINS= 0x207,
1244 DOMAIN_GROUP_RID_POLICY_ADMINS = 0x208,
1247 DOMAIN_ALIAS_RID_ADMINS = 0x220,
1248 DOMAIN_ALIAS_RID_USERS = 0x221,
1249 DOMAIN_ALIAS_RID_GUESTS = 0x222,
1250 DOMAIN_ALIAS_RID_POWER_USERS = 0x223,
1252 DOMAIN_ALIAS_RID_ACCOUNT_OPS = 0x224,
1253 DOMAIN_ALIAS_RID_SYSTEM_OPS = 0x225,
1254 DOMAIN_ALIAS_RID_PRINT_OPS = 0x226,
1255 DOMAIN_ALIAS_RID_BACKUP_OPS = 0x227,
1257 DOMAIN_ALIAS_RID_REPLICATOR = 0x228,
1258 DOMAIN_ALIAS_RID_RAS_SERVERS = 0x229,
1259 DOMAIN_ALIAS_RID_PREW2KCOMPACCESS = 0x22a,
1260 } RELATIVE_IDENTIFIERS;
1263 * The universal well-known SIDs:
1268 * CREATOR_OWNER_SID S-1-3-0
1269 * CREATOR_GROUP_SID S-1-3-1
1270 * CREATOR_OWNER_SERVER_SID S-1-3-2
1271 * CREATOR_GROUP_SERVER_SID S-1-3-3
1273 * (Non-unique IDs) S-1-4
1275 * NT well-known SIDs:
1277 * NT_AUTHORITY_SID S-1-5
1278 * DIALUP_SID S-1-5-1
1280 * NETWORD_SID S-1-5-2
1282 * INTERACTIVE_SID S-1-5-4
1283 * SERVICE_SID S-1-5-6
1284 * ANONYMOUS_LOGON_SID S-1-5-7 (aka null logon session)
1286 * SERVER_LOGON_SID S-1-5-9 (aka domain controller account)
1287 * SELF_SID S-1-5-10 (self RID)
1288 * AUTHENTICATED_USER_SID S-1-5-11
1289 * RESTRICTED_CODE_SID S-1-5-12 (running restricted code)
1290 * TERMINAL_SERVER_SID S-1-5-13 (running on terminal server)
1292 * (Logon IDs) S-1-5-5-X-Y
1294 * (NT non-unique IDs) S-1-5-0x15-...
1296 * (Built-in domain) S-1-5-0x20
1300 * The SID_IDENTIFIER_AUTHORITY is a 48-bit value used in the SID structure.
1302 * NOTE: This is stored as a big endian number, hence the high_part comes
1303 * before the low_part.
1307 u16 high_part; /* High 16-bits. */
1308 u32 low_part; /* Low 32-bits. */
1309 } __attribute__ ((__packed__)) parts;
1310 u8 value[6]; /* Value as individual bytes. */
1311 } __attribute__ ((__packed__)) SID_IDENTIFIER_AUTHORITY;
1314 * The SID structure is a variable-length structure used to uniquely identify
1315 * users or groups. SID stands for security identifier.
1317 * The standard textual representation of the SID is of the form:
1320 * - The first "S" is the literal character 'S' identifying the following
1322 * - R is the revision level of the SID expressed as a sequence of digits
1323 * either in decimal or hexadecimal (if the later, prefixed by "0x").
1324 * - I is the 48-bit identifier_authority, expressed as digits as R above.
1325 * - S... is one or more sub_authority values, expressed as digits as above.
1327 * Example SID; the domain-relative SID of the local Administrators group on
1330 * This translates to a SID with:
1332 * sub_authority_count = 2,
1333 * identifier_authority = {0,0,0,0,0,5}, // SECURITY_NT_AUTHORITY
1334 * sub_authority[0] = 32, // SECURITY_BUILTIN_DOMAIN_RID
1335 * sub_authority[1] = 544 // DOMAIN_ALIAS_RID_ADMINS
1339 u8 sub_authority_count;
1340 SID_IDENTIFIER_AUTHORITY identifier_authority;
1341 le32 sub_authority[1]; /* At least one sub_authority. */
1342 } __attribute__ ((__packed__)) SID;
1345 * Current constants for SIDs.
1348 SID_REVISION = 1, /* Current revision level. */
1349 SID_MAX_SUB_AUTHORITIES = 15, /* Maximum number of those. */
1350 SID_RECOMMENDED_SUB_AUTHORITIES = 1, /* Will change to around 6 in
1351 a future revision. */
1355 * The predefined ACE types (8-bit, see below).
1358 ACCESS_MIN_MS_ACE_TYPE = 0,
1359 ACCESS_ALLOWED_ACE_TYPE = 0,
1360 ACCESS_DENIED_ACE_TYPE = 1,
1361 SYSTEM_AUDIT_ACE_TYPE = 2,
1362 SYSTEM_ALARM_ACE_TYPE = 3, /* Not implemented as of Win2k. */
1363 ACCESS_MAX_MS_V2_ACE_TYPE = 3,
1365 ACCESS_ALLOWED_COMPOUND_ACE_TYPE= 4,
1366 ACCESS_MAX_MS_V3_ACE_TYPE = 4,
1368 /* The following are Win2k only. */
1369 ACCESS_MIN_MS_OBJECT_ACE_TYPE = 5,
1370 ACCESS_ALLOWED_OBJECT_ACE_TYPE = 5,
1371 ACCESS_DENIED_OBJECT_ACE_TYPE = 6,
1372 SYSTEM_AUDIT_OBJECT_ACE_TYPE = 7,
1373 SYSTEM_ALARM_OBJECT_ACE_TYPE = 8,
1374 ACCESS_MAX_MS_OBJECT_ACE_TYPE = 8,
1376 ACCESS_MAX_MS_V4_ACE_TYPE = 8,
1378 /* This one is for WinNT/2k. */
1379 ACCESS_MAX_MS_ACE_TYPE = 8,
1380 } __attribute__ ((__packed__));
1382 typedef u8 ACE_TYPES;
1385 * The ACE flags (8-bit) for audit and inheritance (see below).
1387 * SUCCESSFUL_ACCESS_ACE_FLAG is only used with system audit and alarm ACE
1388 * types to indicate that a message is generated (in Windows!) for successful
1391 * FAILED_ACCESS_ACE_FLAG is only used with system audit and alarm ACE types
1392 * to indicate that a message is generated (in Windows!) for failed accesses.
1395 /* The inheritance flags. */
1396 OBJECT_INHERIT_ACE = 0x01,
1397 CONTAINER_INHERIT_ACE = 0x02,
1398 NO_PROPAGATE_INHERIT_ACE = 0x04,
1399 INHERIT_ONLY_ACE = 0x08,
1400 INHERITED_ACE = 0x10, /* Win2k only. */
1401 VALID_INHERIT_FLAGS = 0x1f,
1403 /* The audit flags. */
1404 SUCCESSFUL_ACCESS_ACE_FLAG = 0x40,
1405 FAILED_ACCESS_ACE_FLAG = 0x80,
1406 } __attribute__ ((__packed__));
1408 typedef u8 ACE_FLAGS;
1411 * An ACE is an access-control entry in an access-control list (ACL).
1412 * An ACE defines access to an object for a specific user or group or defines
1413 * the types of access that generate system-administration messages or alarms
1414 * for a specific user or group. The user or group is identified by a security
1417 * Each ACE starts with an ACE_HEADER structure (aligned on 4-byte boundary),
1418 * which specifies the type and size of the ACE. The format of the subsequent
1419 * data depends on the ACE type.
1423 /* 0*/ ACE_TYPES type; /* Type of the ACE. */
1424 /* 1*/ ACE_FLAGS flags; /* Flags describing the ACE. */
1425 /* 2*/ le16 size; /* Size in bytes of the ACE. */
1426 } __attribute__ ((__packed__)) ACE_HEADER;
1429 * The access mask (32-bit). Defines the access rights.
1431 * The specific rights (bits 0 to 15). These depend on the type of the object
1432 * being secured by the ACE.
1435 /* Specific rights for files and directories are as follows: */
1437 /* Right to read data from the file. (FILE) */
1438 FILE_READ_DATA = cpu_to_le32(0x00000001),
1439 /* Right to list contents of a directory. (DIRECTORY) */
1440 FILE_LIST_DIRECTORY = cpu_to_le32(0x00000001),
1442 /* Right to write data to the file. (FILE) */
1443 FILE_WRITE_DATA = cpu_to_le32(0x00000002),
1444 /* Right to create a file in the directory. (DIRECTORY) */
1445 FILE_ADD_FILE = cpu_to_le32(0x00000002),
1447 /* Right to append data to the file. (FILE) */
1448 FILE_APPEND_DATA = cpu_to_le32(0x00000004),
1449 /* Right to create a subdirectory. (DIRECTORY) */
1450 FILE_ADD_SUBDIRECTORY = cpu_to_le32(0x00000004),
1452 /* Right to read extended attributes. (FILE/DIRECTORY) */
1453 FILE_READ_EA = cpu_to_le32(0x00000008),
1455 /* Right to write extended attributes. (FILE/DIRECTORY) */
1456 FILE_WRITE_EA = cpu_to_le32(0x00000010),
1458 /* Right to execute a file. (FILE) */
1459 FILE_EXECUTE = cpu_to_le32(0x00000020),
1460 /* Right to traverse the directory. (DIRECTORY) */
1461 FILE_TRAVERSE = cpu_to_le32(0x00000020),
1464 * Right to delete a directory and all the files it contains (its
1465 * children), even if the files are read-only. (DIRECTORY)
1467 FILE_DELETE_CHILD = cpu_to_le32(0x00000040),
1469 /* Right to read file attributes. (FILE/DIRECTORY) */
1470 FILE_READ_ATTRIBUTES = cpu_to_le32(0x00000080),
1472 /* Right to change file attributes. (FILE/DIRECTORY) */
1473 FILE_WRITE_ATTRIBUTES = cpu_to_le32(0x00000100),
1476 * The standard rights (bits 16 to 23). These are independent of the
1477 * type of object being secured.
1480 /* Right to delete the object. */
1481 DELETE = cpu_to_le32(0x00010000),
1484 * Right to read the information in the object's security descriptor,
1485 * not including the information in the SACL, i.e. right to read the
1486 * security descriptor and owner.
1488 READ_CONTROL = cpu_to_le32(0x00020000),
1490 /* Right to modify the DACL in the object's security descriptor. */
1491 WRITE_DAC = cpu_to_le32(0x00040000),
1493 /* Right to change the owner in the object's security descriptor. */
1494 WRITE_OWNER = cpu_to_le32(0x00080000),
1497 * Right to use the object for synchronization. Enables a process to
1498 * wait until the object is in the signalled state. Some object types
1499 * do not support this access right.
1501 SYNCHRONIZE = cpu_to_le32(0x00100000),
1504 * The following STANDARD_RIGHTS_* are combinations of the above for
1505 * convenience and are defined by the Win32 API.
1508 /* These are currently defined to READ_CONTROL. */
1509 STANDARD_RIGHTS_READ = cpu_to_le32(0x00020000),
1510 STANDARD_RIGHTS_WRITE = cpu_to_le32(0x00020000),
1511 STANDARD_RIGHTS_EXECUTE = cpu_to_le32(0x00020000),
1513 /* Combines DELETE, READ_CONTROL, WRITE_DAC, and WRITE_OWNER access. */
1514 STANDARD_RIGHTS_REQUIRED = cpu_to_le32(0x000f0000),
1517 * Combines DELETE, READ_CONTROL, WRITE_DAC, WRITE_OWNER, and
1518 * SYNCHRONIZE access.
1520 STANDARD_RIGHTS_ALL = cpu_to_le32(0x001f0000),
1523 * The access system ACL and maximum allowed access types (bits 24 to
1524 * 25, bits 26 to 27 are reserved).
1526 ACCESS_SYSTEM_SECURITY = cpu_to_le32(0x01000000),
1527 MAXIMUM_ALLOWED = cpu_to_le32(0x02000000),
1530 * The generic rights (bits 28 to 31). These map onto the standard and
1534 /* Read, write, and execute access. */
1535 GENERIC_ALL = cpu_to_le32(0x10000000),
1537 /* Execute access. */
1538 GENERIC_EXECUTE = cpu_to_le32(0x20000000),
1541 * Write access. For files, this maps onto:
1542 * FILE_APPEND_DATA | FILE_WRITE_ATTRIBUTES | FILE_WRITE_DATA |
1543 * FILE_WRITE_EA | STANDARD_RIGHTS_WRITE | SYNCHRONIZE
1544 * For directories, the mapping has the same numerical value. See
1545 * above for the descriptions of the rights granted.
1547 GENERIC_WRITE = cpu_to_le32(0x40000000),
1550 * Read access. For files, this maps onto:
1551 * FILE_READ_ATTRIBUTES | FILE_READ_DATA | FILE_READ_EA |
1552 * STANDARD_RIGHTS_READ | SYNCHRONIZE
1553 * For directories, the mapping has the same numberical value. See
1554 * above for the descriptions of the rights granted.
1556 GENERIC_READ = cpu_to_le32(0x80000000),
1559 typedef le32 ACCESS_MASK;
1562 * The generic mapping array. Used to denote the mapping of each generic
1563 * access right to a specific access mask.
1565 * FIXME: What exactly is this and what is it for? (AIA)
1568 ACCESS_MASK generic_read;
1569 ACCESS_MASK generic_write;
1570 ACCESS_MASK generic_execute;
1571 ACCESS_MASK generic_all;
1572 } __attribute__ ((__packed__)) GENERIC_MAPPING;
1575 * The predefined ACE type structures are as defined below.
1579 * ACCESS_ALLOWED_ACE, ACCESS_DENIED_ACE, SYSTEM_AUDIT_ACE, SYSTEM_ALARM_ACE
1582 /* 0 ACE_HEADER; -- Unfolded here as gcc doesn't like unnamed structs. */
1583 ACE_TYPES type; /* Type of the ACE. */
1584 ACE_FLAGS flags; /* Flags describing the ACE. */
1585 le16 size; /* Size in bytes of the ACE. */
1586 /* 4*/ ACCESS_MASK mask; /* Access mask associated with the ACE. */
1588 /* 8*/ SID sid; /* The SID associated with the ACE. */
1589 } __attribute__ ((__packed__)) ACCESS_ALLOWED_ACE, ACCESS_DENIED_ACE,
1590 SYSTEM_AUDIT_ACE, SYSTEM_ALARM_ACE;
1593 * The object ACE flags (32-bit).
1596 ACE_OBJECT_TYPE_PRESENT = cpu_to_le32(1),
1597 ACE_INHERITED_OBJECT_TYPE_PRESENT = cpu_to_le32(2),
1600 typedef le32 OBJECT_ACE_FLAGS;
1603 /* 0 ACE_HEADER; -- Unfolded here as gcc doesn't like unnamed structs. */
1604 ACE_TYPES type; /* Type of the ACE. */
1605 ACE_FLAGS flags; /* Flags describing the ACE. */
1606 le16 size; /* Size in bytes of the ACE. */
1607 /* 4*/ ACCESS_MASK mask; /* Access mask associated with the ACE. */
1609 /* 8*/ OBJECT_ACE_FLAGS object_flags; /* Flags describing the object ACE. */
1610 /* 12*/ GUID object_type;
1611 /* 28*/ GUID inherited_object_type;
1613 /* 44*/ SID sid; /* The SID associated with the ACE. */
1614 } __attribute__ ((__packed__)) ACCESS_ALLOWED_OBJECT_ACE,
1615 ACCESS_DENIED_OBJECT_ACE,
1616 SYSTEM_AUDIT_OBJECT_ACE,
1617 SYSTEM_ALARM_OBJECT_ACE;
1620 * An ACL is an access-control list (ACL).
1621 * An ACL starts with an ACL header structure, which specifies the size of
1622 * the ACL and the number of ACEs it contains. The ACL header is followed by
1623 * zero or more access control entries (ACEs). The ACL as well as each ACE
1624 * are aligned on 4-byte boundaries.
1627 u8 revision; /* Revision of this ACL. */
1629 le16 size; /* Allocated space in bytes for ACL. Includes this
1630 header, the ACEs and the remaining free space. */
1631 le16 ace_count; /* Number of ACEs in the ACL. */
1633 /* sizeof() = 8 bytes */
1634 } __attribute__ ((__packed__)) ACL;
1637 * Current constants for ACLs.
1640 /* Current revision. */
1642 ACL_REVISION_DS = 4,
1644 /* History of revisions. */
1646 MIN_ACL_REVISION = 2,
1650 MAX_ACL_REVISION = 4,
1654 * The security descriptor control flags (16-bit).
1656 * SE_OWNER_DEFAULTED - This boolean flag, when set, indicates that the SID
1657 * pointed to by the Owner field was provided by a defaulting mechanism
1658 * rather than explicitly provided by the original provider of the
1659 * security descriptor. This may affect the treatment of the SID with
1660 * respect to inheritence of an owner.
1662 * SE_GROUP_DEFAULTED - This boolean flag, when set, indicates that the SID in
1663 * the Group field was provided by a defaulting mechanism rather than
1664 * explicitly provided by the original provider of the security
1665 * descriptor. This may affect the treatment of the SID with respect to
1666 * inheritence of a primary group.
1668 * SE_DACL_PRESENT - This boolean flag, when set, indicates that the security
1669 * descriptor contains a discretionary ACL. If this flag is set and the
1670 * Dacl field of the SECURITY_DESCRIPTOR is null, then a null ACL is
1671 * explicitly being specified.
1673 * SE_DACL_DEFAULTED - This boolean flag, when set, indicates that the ACL
1674 * pointed to by the Dacl field was provided by a defaulting mechanism
1675 * rather than explicitly provided by the original provider of the
1676 * security descriptor. This may affect the treatment of the ACL with
1677 * respect to inheritence of an ACL. This flag is ignored if the
1678 * DaclPresent flag is not set.
1680 * SE_SACL_PRESENT - This boolean flag, when set, indicates that the security
1681 * descriptor contains a system ACL pointed to by the Sacl field. If this
1682 * flag is set and the Sacl field of the SECURITY_DESCRIPTOR is null, then
1683 * an empty (but present) ACL is being specified.
1685 * SE_SACL_DEFAULTED - This boolean flag, when set, indicates that the ACL
1686 * pointed to by the Sacl 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 * SaclPresent flag is not set.
1692 * SE_SELF_RELATIVE - This boolean flag, when set, indicates that the security
1693 * descriptor is in self-relative form. In this form, all fields of the
1694 * security descriptor are contiguous in memory and all pointer fields are
1695 * expressed as offsets from the beginning of the security descriptor.
1698 SE_OWNER_DEFAULTED = cpu_to_le16(0x0001),
1699 SE_GROUP_DEFAULTED = cpu_to_le16(0x0002),
1700 SE_DACL_PRESENT = cpu_to_le16(0x0004),
1701 SE_DACL_DEFAULTED = cpu_to_le16(0x0008),
1703 SE_SACL_PRESENT = cpu_to_le16(0x0010),
1704 SE_SACL_DEFAULTED = cpu_to_le16(0x0020),
1706 SE_DACL_AUTO_INHERIT_REQ = cpu_to_le16(0x0100),
1707 SE_SACL_AUTO_INHERIT_REQ = cpu_to_le16(0x0200),
1708 SE_DACL_AUTO_INHERITED = cpu_to_le16(0x0400),
1709 SE_SACL_AUTO_INHERITED = cpu_to_le16(0x0800),
1711 SE_DACL_PROTECTED = cpu_to_le16(0x1000),
1712 SE_SACL_PROTECTED = cpu_to_le16(0x2000),
1713 SE_RM_CONTROL_VALID = cpu_to_le16(0x4000),
1714 SE_SELF_RELATIVE = cpu_to_le16(0x8000)
1715 } __attribute__ ((__packed__));
1717 typedef le16 SECURITY_DESCRIPTOR_CONTROL;
1720 * Self-relative security descriptor. Contains the owner and group SIDs as well
1721 * as the sacl and dacl ACLs inside the security descriptor itself.
1724 u8 revision; /* Revision level of the security descriptor. */
1726 SECURITY_DESCRIPTOR_CONTROL control; /* Flags qualifying the type of
1727 the descriptor as well as the following fields. */
1728 le32 owner; /* Byte offset to a SID representing an object's
1729 owner. If this is NULL, no owner SID is present in
1731 le32 group; /* Byte offset to a SID representing an object's
1732 primary group. If this is NULL, no primary group
1733 SID is present in the descriptor. */
1734 le32 sacl; /* Byte offset to a system ACL. Only valid, if
1735 SE_SACL_PRESENT is set in the control field. If
1736 SE_SACL_PRESENT is set but sacl is NULL, a NULL ACL
1738 le32 dacl; /* Byte offset to a discretionary ACL. Only valid, if
1739 SE_DACL_PRESENT is set in the control field. If
1740 SE_DACL_PRESENT is set but dacl is NULL, a NULL ACL
1741 (unconditionally granting access) is specified. */
1742 /* sizeof() = 0x14 bytes */
1743 } __attribute__ ((__packed__)) SECURITY_DESCRIPTOR_RELATIVE;
1746 * Absolute security descriptor. Does not contain the owner and group SIDs, nor
1747 * the sacl and dacl ACLs inside the security descriptor. Instead, it contains
1748 * pointers to these structures in memory. Obviously, absolute security
1749 * descriptors are only useful for in memory representations of security
1750 * descriptors. On disk, a self-relative security descriptor is used.
1753 u8 revision; /* Revision level of the security descriptor. */
1755 SECURITY_DESCRIPTOR_CONTROL control; /* Flags qualifying the type of
1756 the descriptor as well as the following fields. */
1757 SID *owner; /* Points to a SID representing an object's owner. If
1758 this is NULL, no owner SID is present in the
1760 SID *group; /* Points to a SID representing an object's primary
1761 group. If this is NULL, no primary group SID is
1762 present in the descriptor. */
1763 ACL *sacl; /* Points to a system ACL. Only valid, if
1764 SE_SACL_PRESENT is set in the control field. If
1765 SE_SACL_PRESENT is set but sacl is NULL, a NULL ACL
1767 ACL *dacl; /* Points to a discretionary ACL. Only valid, if
1768 SE_DACL_PRESENT is set in the control field. If
1769 SE_DACL_PRESENT is set but dacl is NULL, a NULL ACL
1770 (unconditionally granting access) is specified. */
1771 } __attribute__ ((__packed__)) SECURITY_DESCRIPTOR;
1774 * Current constants for security descriptors.
1777 /* Current revision. */
1778 SECURITY_DESCRIPTOR_REVISION = 1,
1779 SECURITY_DESCRIPTOR_REVISION1 = 1,
1781 /* The sizes of both the absolute and relative security descriptors is
1782 the same as pointers, at least on ia32 architecture are 32-bit. */
1783 SECURITY_DESCRIPTOR_MIN_LENGTH = sizeof(SECURITY_DESCRIPTOR),
1784 } SECURITY_DESCRIPTOR_CONSTANTS;
1787 * Attribute: Security descriptor (0x50). A standard self-relative security
1790 * NOTE: Can be resident or non-resident.
1791 * NOTE: Not used in NTFS 3.0+, as security descriptors are stored centrally
1792 * in FILE_Secure and the correct descriptor is found using the security_id
1793 * from the standard information attribute.
1795 typedef SECURITY_DESCRIPTOR_RELATIVE SECURITY_DESCRIPTOR_ATTR;
1798 * On NTFS 3.0+, all security descriptors are stored in FILE_Secure. Only one
1799 * referenced instance of each unique security descriptor is stored.
1801 * FILE_Secure contains no unnamed data attribute, i.e. it has zero length. It
1802 * does, however, contain two indexes ($SDH and $SII) as well as a named data
1805 * Every unique security descriptor is assigned a unique security identifier
1806 * (security_id, not to be confused with a SID). The security_id is unique for
1807 * the NTFS volume and is used as an index into the $SII index, which maps
1808 * security_ids to the security descriptor's storage location within the $SDS
1809 * data attribute. The $SII index is sorted by ascending security_id.
1811 * A simple hash is computed from each security descriptor. This hash is used
1812 * as an index into the $SDH index, which maps security descriptor hashes to
1813 * the security descriptor's storage location within the $SDS data attribute.
1814 * The $SDH index is sorted by security descriptor hash and is stored in a B+
1815 * tree. When searching $SDH (with the intent of determining whether or not a
1816 * new security descriptor is already present in the $SDS data stream), if a
1817 * matching hash is found, but the security descriptors do not match, the
1818 * search in the $SDH index is continued, searching for a next matching hash.
1820 * When a precise match is found, the security_id coresponding to the security
1821 * descriptor in the $SDS attribute is read from the found $SDH index entry and
1822 * is stored in the $STANDARD_INFORMATION attribute of the file/directory to
1823 * which the security descriptor is being applied. The $STANDARD_INFORMATION
1824 * attribute is present in all base mft records (i.e. in all files and
1827 * If a match is not found, the security descriptor is assigned a new unique
1828 * security_id and is added to the $SDS data attribute. Then, entries
1829 * referencing the this security descriptor in the $SDS data attribute are
1830 * added to the $SDH and $SII indexes.
1832 * Note: Entries are never deleted from FILE_Secure, even if nothing
1833 * references an entry any more.
1837 * This header precedes each security descriptor in the $SDS data stream.
1838 * This is also the index entry data part of both the $SII and $SDH indexes.
1841 le32 hash; /* Hash of the security descriptor. */
1842 le32 security_id; /* The security_id assigned to the descriptor. */
1843 le64 offset; /* Byte offset of this entry in the $SDS stream. */
1844 le32 length; /* Size in bytes of this entry in $SDS stream. */
1845 } __attribute__ ((__packed__)) SECURITY_DESCRIPTOR_HEADER;
1848 * The $SDS data stream contains the security descriptors, aligned on 16-byte
1849 * boundaries, sorted by security_id in a B+ tree. Security descriptors cannot
1850 * cross 256kib boundaries (this restriction is imposed by the Windows cache
1851 * manager). Each security descriptor is contained in a SDS_ENTRY structure.
1852 * Also, each security descriptor is stored twice in the $SDS stream with a
1853 * fixed offset of 0x40000 bytes (256kib, the Windows cache manager's max size)
1854 * between them; i.e. if a SDS_ENTRY specifies an offset of 0x51d0, then the
1855 * the first copy of the security descriptor will be at offset 0x51d0 in the
1856 * $SDS data stream and the second copy will be at offset 0x451d0.
1860 /* 0 SECURITY_DESCRIPTOR_HEADER; -- Unfolded here as gcc doesn't like
1862 le32 hash; /* Hash of the security descriptor. */
1863 le32 security_id; /* The security_id assigned to the descriptor. */
1864 le64 offset; /* Byte offset of this entry in the $SDS stream. */
1865 le32 length; /* Size in bytes of this entry in $SDS stream. */
1866 /* 20*/ SECURITY_DESCRIPTOR_RELATIVE sid; /* The self-relative security
1868 } __attribute__ ((__packed__)) SDS_ENTRY;
1871 * The index entry key used in the $SII index. The collation type is
1872 * COLLATION_NTOFS_ULONG.
1875 le32 security_id; /* The security_id assigned to the descriptor. */
1876 } __attribute__ ((__packed__)) SII_INDEX_KEY;
1879 * The index entry key used in the $SDH index. The keys are sorted first by
1880 * hash and then by security_id. The collation rule is
1881 * COLLATION_NTOFS_SECURITY_HASH.
1884 le32 hash; /* Hash of the security descriptor. */
1885 le32 security_id; /* The security_id assigned to the descriptor. */
1886 } __attribute__ ((__packed__)) SDH_INDEX_KEY;
1889 * Attribute: Volume name (0x60).
1891 * NOTE: Always resident.
1892 * NOTE: Present only in FILE_Volume.
1895 ntfschar name[0]; /* The name of the volume in Unicode. */
1896 } __attribute__ ((__packed__)) VOLUME_NAME;
1899 * Possible flags for the volume (16-bit).
1902 VOLUME_IS_DIRTY = cpu_to_le16(0x0001),
1903 VOLUME_RESIZE_LOG_FILE = cpu_to_le16(0x0002),
1904 VOLUME_UPGRADE_ON_MOUNT = cpu_to_le16(0x0004),
1905 VOLUME_MOUNTED_ON_NT4 = cpu_to_le16(0x0008),
1907 VOLUME_DELETE_USN_UNDERWAY = cpu_to_le16(0x0010),
1908 VOLUME_REPAIR_OBJECT_ID = cpu_to_le16(0x0020),
1910 VOLUME_CHKDSK_UNDERWAY = cpu_to_le16(0x4000),
1911 VOLUME_MODIFIED_BY_CHKDSK = cpu_to_le16(0x8000),
1913 VOLUME_FLAGS_MASK = cpu_to_le16(0xc03f),
1915 /* To make our life easier when checking if we must mount read-only. */
1916 VOLUME_MUST_MOUNT_RO_MASK = cpu_to_le16(0xc027),
1917 } __attribute__ ((__packed__));
1919 typedef le16 VOLUME_FLAGS;
1922 * Attribute: Volume information (0x70).
1924 * NOTE: Always resident.
1925 * NOTE: Present only in FILE_Volume.
1926 * NOTE: Windows 2000 uses NTFS 3.0 while Windows NT4 service pack 6a uses
1927 * NTFS 1.2. I haven't personally seen other values yet.
1930 le64 reserved; /* Not used (yet?). */
1931 u8 major_ver; /* Major version of the ntfs format. */
1932 u8 minor_ver; /* Minor version of the ntfs format. */
1933 VOLUME_FLAGS flags; /* Bit array of VOLUME_* flags. */
1934 } __attribute__ ((__packed__)) VOLUME_INFORMATION;
1937 * Attribute: Data attribute (0x80).
1939 * NOTE: Can be resident or non-resident.
1941 * Data contents of a file (i.e. the unnamed stream) or of a named stream.
1944 u8 data[0]; /* The file's data contents. */
1945 } __attribute__ ((__packed__)) DATA_ATTR;
1948 * Index header flags (8-bit).
1952 * When index header is in an index root attribute:
1954 SMALL_INDEX = 0, /* The index is small enough to fit inside the index
1955 root attribute and there is no index allocation
1956 attribute present. */
1957 LARGE_INDEX = 1, /* The index is too large to fit in the index root
1958 attribute and/or an index allocation attribute is
1961 * When index header is in an index block, i.e. is part of index
1962 * allocation attribute:
1964 LEAF_NODE = 0, /* This is a leaf node, i.e. there are no more nodes
1965 branching off it. */
1966 INDEX_NODE = 1, /* This node indexes other nodes, i.e. it is not a leaf
1968 NODE_MASK = 1, /* Mask for accessing the *_NODE bits. */
1969 } __attribute__ ((__packed__));
1971 typedef u8 INDEX_HEADER_FLAGS;
1974 * This is the header for indexes, describing the INDEX_ENTRY records, which
1975 * follow the INDEX_HEADER. Together the index header and the index entries
1976 * make up a complete index.
1978 * IMPORTANT NOTE: The offset, length and size structure members are counted
1979 * relative to the start of the index header structure and not relative to the
1980 * start of the index root or index allocation structures themselves.
1983 le32 entries_offset; /* Byte offset to first INDEX_ENTRY
1984 aligned to 8-byte boundary. */
1985 le32 index_length; /* Data size of the index in bytes,
1986 i.e. bytes used from allocated
1987 size, aligned to 8-byte boundary. */
1988 le32 allocated_size; /* Byte size of this index (block),
1989 multiple of 8 bytes. */
1990 /* NOTE: For the index root attribute, the above two numbers are always
1991 equal, as the attribute is resident and it is resized as needed. In
1992 the case of the index allocation attribute the attribute is not
1993 resident and hence the allocated_size is a fixed value and must
1994 equal the index_block_size specified by the INDEX_ROOT attribute
1995 corresponding to the INDEX_ALLOCATION attribute this INDEX_BLOCK
1997 INDEX_HEADER_FLAGS flags; /* Bit field of INDEX_HEADER_FLAGS. */
1998 u8 reserved[3]; /* Reserved/align to 8-byte boundary. */
1999 } __attribute__ ((__packed__)) INDEX_HEADER;
2002 * Attribute: Index root (0x90).
2004 * NOTE: Always resident.
2006 * This is followed by a sequence of index entries (INDEX_ENTRY structures)
2007 * as described by the index header.
2009 * When a directory is small enough to fit inside the index root then this
2010 * is the only attribute describing the directory. When the directory is too
2011 * large to fit in the index root, on the other hand, two aditional attributes
2012 * are present: an index allocation attribute, containing sub-nodes of the B+
2013 * directory tree (see below), and a bitmap attribute, describing which virtual
2014 * cluster numbers (vcns) in the index allocation attribute are in use by an
2017 * NOTE: The root directory (FILE_root) contains an entry for itself. Other
2018 * dircetories do not contain entries for themselves, though.
2021 ATTR_TYPE type; /* Type of the indexed attribute. Is
2022 $FILE_NAME for directories, zero
2023 for view indexes. No other values
2025 COLLATION_RULE collation_rule; /* Collation rule used to sort the
2026 index entries. If type is $FILE_NAME,
2027 this must be COLLATION_FILE_NAME. */
2028 le32 index_block_size; /* Size of each index block in bytes (in
2029 the index allocation attribute). */
2030 u8 clusters_per_index_block; /* Cluster size of each index block (in
2031 the index allocation attribute), when
2032 an index block is >= than a cluster,
2033 otherwise this will be the log of
2034 the size (like how the encoding of
2035 the mft record size and the index
2036 record size found in the boot sector
2037 work). Has to be a power of 2. */
2038 u8 reserved[3]; /* Reserved/align to 8-byte boundary. */
2039 INDEX_HEADER index; /* Index header describing the
2040 following index entries. */
2041 } __attribute__ ((__packed__)) INDEX_ROOT;
2044 * Attribute: Index allocation (0xa0).
2046 * NOTE: Always non-resident (doesn't make sense to be resident anyway!).
2048 * This is an array of index blocks. Each index block starts with an
2049 * INDEX_BLOCK structure containing an index header, followed by a sequence of
2050 * index entries (INDEX_ENTRY structures), as described by the INDEX_HEADER.
2053 /* 0 NTFS_RECORD; -- Unfolded here as gcc doesn't like unnamed structs. */
2054 NTFS_RECORD_TYPE magic; /* Magic is "INDX". */
2055 le16 usa_ofs; /* See NTFS_RECORD definition. */
2056 le16 usa_count; /* See NTFS_RECORD definition. */
2058 /* 8*/ sle64 lsn; /* $LogFile sequence number of the last
2059 modification of this index block. */
2060 /* 16*/ leVCN index_block_vcn; /* Virtual cluster number of the index block.
2061 If the cluster_size on the volume is <= the
2062 index_block_size of the directory,
2063 index_block_vcn counts in units of clusters,
2064 and in units of sectors otherwise. */
2065 /* 24*/ INDEX_HEADER index; /* Describes the following index entries. */
2066 /* sizeof()= 40 (0x28) bytes */
2068 * When creating the index block, we place the update sequence array at this
2069 * offset, i.e. before we start with the index entries. This also makes sense,
2070 * otherwise we could run into problems with the update sequence array
2071 * containing in itself the last two bytes of a sector which would mean that
2072 * multi sector transfer protection wouldn't work. As you can't protect data
2073 * by overwriting it since you then can't get it back...
2074 * When reading use the data from the ntfs record header.
2076 } __attribute__ ((__packed__)) INDEX_BLOCK;
2078 typedef INDEX_BLOCK INDEX_ALLOCATION;
2081 * The system file FILE_Extend/$Reparse contains an index named $R listing
2082 * all reparse points on the volume. The index entry keys are as defined
2083 * below. Note, that there is no index data associated with the index entries.
2085 * The index entries are sorted by the index key file_id. The collation rule is
2086 * COLLATION_NTOFS_ULONGS. FIXME: Verify whether the reparse_tag is not the
2087 * primary key / is not a key at all. (AIA)
2090 le32 reparse_tag; /* Reparse point type (inc. flags). */
2091 leMFT_REF file_id; /* Mft record of the file containing the
2092 reparse point attribute. */
2093 } __attribute__ ((__packed__)) REPARSE_INDEX_KEY;
2096 * Quota flags (32-bit).
2098 * The user quota flags. Names explain meaning.
2101 QUOTA_FLAG_DEFAULT_LIMITS = cpu_to_le32(0x00000001),
2102 QUOTA_FLAG_LIMIT_REACHED = cpu_to_le32(0x00000002),
2103 QUOTA_FLAG_ID_DELETED = cpu_to_le32(0x00000004),
2105 QUOTA_FLAG_USER_MASK = cpu_to_le32(0x00000007),
2106 /* This is a bit mask for the user quota flags. */
2109 * These flags are only present in the quota defaults index entry, i.e.
2110 * in the entry where owner_id = QUOTA_DEFAULTS_ID.
2112 QUOTA_FLAG_TRACKING_ENABLED = cpu_to_le32(0x00000010),
2113 QUOTA_FLAG_ENFORCEMENT_ENABLED = cpu_to_le32(0x00000020),
2114 QUOTA_FLAG_TRACKING_REQUESTED = cpu_to_le32(0x00000040),
2115 QUOTA_FLAG_LOG_THRESHOLD = cpu_to_le32(0x00000080),
2117 QUOTA_FLAG_LOG_LIMIT = cpu_to_le32(0x00000100),
2118 QUOTA_FLAG_OUT_OF_DATE = cpu_to_le32(0x00000200),
2119 QUOTA_FLAG_CORRUPT = cpu_to_le32(0x00000400),
2120 QUOTA_FLAG_PENDING_DELETES = cpu_to_le32(0x00000800),
2123 typedef le32 QUOTA_FLAGS;
2126 * The system file FILE_Extend/$Quota contains two indexes $O and $Q. Quotas
2127 * are on a per volume and per user basis.
2129 * The $Q index contains one entry for each existing user_id on the volume. The
2130 * index key is the user_id of the user/group owning this quota control entry,
2131 * i.e. the key is the owner_id. The user_id of the owner of a file, i.e. the
2132 * owner_id, is found in the standard information attribute. The collation rule
2133 * for $Q is COLLATION_NTOFS_ULONG.
2135 * The $O index contains one entry for each user/group who has been assigned
2136 * a quota on that volume. The index key holds the SID of the user_id the
2137 * entry belongs to, i.e. the owner_id. The collation rule for $O is
2138 * COLLATION_NTOFS_SID.
2140 * The $O index entry data is the user_id of the user corresponding to the SID.
2141 * This user_id is used as an index into $Q to find the quota control entry
2142 * associated with the SID.
2144 * The $Q index entry data is the quota control entry and is defined below.
2147 le32 version; /* Currently equals 2. */
2148 QUOTA_FLAGS flags; /* Flags describing this quota entry. */
2149 le64 bytes_used; /* How many bytes of the quota are in use. */
2150 sle64 change_time; /* Last time this quota entry was changed. */
2151 sle64 threshold; /* Soft quota (-1 if not limited). */
2152 sle64 limit; /* Hard quota (-1 if not limited). */
2153 sle64 exceeded_time; /* How long the soft quota has been exceeded. */
2154 SID sid; /* The SID of the user/object associated with
2155 this quota entry. Equals zero for the quota
2156 defaults entry (and in fact on a WinXP
2157 volume, it is not present at all). */
2158 } __attribute__ ((__packed__)) QUOTA_CONTROL_ENTRY;
2161 * Predefined owner_id values (32-bit).
2164 QUOTA_INVALID_ID = cpu_to_le32(0x00000000),
2165 QUOTA_DEFAULTS_ID = cpu_to_le32(0x00000001),
2166 QUOTA_FIRST_USER_ID = cpu_to_le32(0x00000100),
2170 * Current constants for quota control entries.
2173 /* Current version. */
2175 } QUOTA_CONTROL_ENTRY_CONSTANTS;
2178 * Index entry flags (16-bit).
2181 INDEX_ENTRY_NODE = cpu_to_le16(1), /* This entry contains a
2182 sub-node, i.e. a reference to an index block in form of
2183 a virtual cluster number (see below). */
2184 INDEX_ENTRY_END = cpu_to_le16(2), /* This signifies the last
2185 entry in an index block. The index entry does not
2186 represent a file but it can point to a sub-node. */
2188 INDEX_ENTRY_SPACE_FILLER = cpu_to_le16(0xffff), /* gcc: Force
2189 enum bit width to 16-bit. */
2190 } __attribute__ ((__packed__));
2192 typedef le16 INDEX_ENTRY_FLAGS;
2195 * This the index entry header (see below).
2199 struct { /* Only valid when INDEX_ENTRY_END is not set. */
2200 leMFT_REF indexed_file; /* The mft reference of the file
2201 described by this index
2202 entry. Used for directory
2204 } __attribute__ ((__packed__)) dir;
2205 struct { /* Used for views/indexes to find the entry's data. */
2206 le16 data_offset; /* Data byte offset from this
2207 INDEX_ENTRY. Follows the
2209 le16 data_length; /* Data length in bytes. */
2210 le32 reservedV; /* Reserved (zero). */
2211 } __attribute__ ((__packed__)) vi;
2212 } __attribute__ ((__packed__)) data;
2213 /* 8*/ le16 length; /* Byte size of this index entry, multiple of
2215 /* 10*/ le16 key_length; /* Byte size of the key value, which is in the
2216 index entry. It follows field reserved. Not
2217 multiple of 8-bytes. */
2218 /* 12*/ INDEX_ENTRY_FLAGS flags; /* Bit field of INDEX_ENTRY_* flags. */
2219 /* 14*/ le16 reserved; /* Reserved/align to 8-byte boundary. */
2220 /* sizeof() = 16 bytes */
2221 } __attribute__ ((__packed__)) INDEX_ENTRY_HEADER;
2224 * This is an index entry. A sequence of such entries follows each INDEX_HEADER
2225 * structure. Together they make up a complete index. The index follows either
2226 * an index root attribute or an index allocation attribute.
2228 * NOTE: Before NTFS 3.0 only filename attributes were indexed.
2232 /* 0 INDEX_ENTRY_HEADER; -- Unfolded here as gcc dislikes unnamed structs. */
2234 struct { /* Only valid when INDEX_ENTRY_END is not set. */
2235 leMFT_REF indexed_file; /* The mft reference of the file
2236 described by this index
2237 entry. Used for directory
2239 } __attribute__ ((__packed__)) dir;
2240 struct { /* Used for views/indexes to find the entry's data. */
2241 le16 data_offset; /* Data byte offset from this
2242 INDEX_ENTRY. Follows the
2244 le16 data_length; /* Data length in bytes. */
2245 le32 reservedV; /* Reserved (zero). */
2246 } __attribute__ ((__packed__)) vi;
2247 } __attribute__ ((__packed__)) data;
2248 le16 length; /* Byte size of this index entry, multiple of
2250 le16 key_length; /* Byte size of the key value, which is in the
2251 index entry. It follows field reserved. Not
2252 multiple of 8-bytes. */
2253 INDEX_ENTRY_FLAGS flags; /* Bit field of INDEX_ENTRY_* flags. */
2254 le16 reserved; /* Reserved/align to 8-byte boundary. */
2256 /* 16*/ union { /* The key of the indexed attribute. NOTE: Only present
2257 if INDEX_ENTRY_END bit in flags is not set. NOTE: On
2258 NTFS versions before 3.0 the only valid key is the
2259 FILE_NAME_ATTR. On NTFS 3.0+ the following
2260 additional index keys are defined: */
2261 FILE_NAME_ATTR file_name;/* $I30 index in directories. */
2262 SII_INDEX_KEY sii; /* $SII index in $Secure. */
2263 SDH_INDEX_KEY sdh; /* $SDH index in $Secure. */
2264 GUID object_id; /* $O index in FILE_Extend/$ObjId: The
2265 object_id of the mft record found in
2266 the data part of the index. */
2267 REPARSE_INDEX_KEY reparse; /* $R index in
2268 FILE_Extend/$Reparse. */
2269 SID sid; /* $O index in FILE_Extend/$Quota:
2270 SID of the owner of the user_id. */
2271 le32 owner_id; /* $Q index in FILE_Extend/$Quota:
2272 user_id of the owner of the quota
2273 control entry in the data part of
2275 } __attribute__ ((__packed__)) key;
2276 /* The (optional) index data is inserted here when creating. */
2277 // leVCN vcn; /* If INDEX_ENTRY_NODE bit in flags is set, the last
2278 // eight bytes of this index entry contain the virtual
2279 // cluster number of the index block that holds the
2280 // entries immediately preceding the current entry (the
2281 // vcn references the corresponding cluster in the data
2282 // of the non-resident index allocation attribute). If
2283 // the key_length is zero, then the vcn immediately
2284 // follows the INDEX_ENTRY_HEADER. Regardless of
2285 // key_length, the address of the 8-byte boundary
2286 // alligned vcn of INDEX_ENTRY{_HEADER} *ie is given by
2287 // (char*)ie + le16_to_cpu(ie*)->length) - sizeof(VCN),
2288 // where sizeof(VCN) can be hardcoded as 8 if wanted. */
2289 } __attribute__ ((__packed__)) INDEX_ENTRY;
2292 * Attribute: Bitmap (0xb0).
2294 * Contains an array of bits (aka a bitfield).
2296 * When used in conjunction with the index allocation attribute, each bit
2297 * corresponds to one index block within the index allocation attribute. Thus
2298 * the number of bits in the bitmap * index block size / cluster size is the
2299 * number of clusters in the index allocation attribute.
2302 u8 bitmap[0]; /* Array of bits. */
2303 } __attribute__ ((__packed__)) BITMAP_ATTR;
2306 * The reparse point tag defines the type of the reparse point. It also
2307 * includes several flags, which further describe the reparse point.
2309 * The reparse point tag is an unsigned 32-bit value divided in three parts:
2311 * 1. The least significant 16 bits (i.e. bits 0 to 15) specifiy the type of
2312 * the reparse point.
2313 * 2. The 13 bits after this (i.e. bits 16 to 28) are reserved for future use.
2314 * 3. The most significant three bits are flags describing the reparse point.
2315 * They are defined as follows:
2316 * bit 29: Name surrogate bit. If set, the filename is an alias for
2317 * another object in the system.
2318 * bit 30: High-latency bit. If set, accessing the first byte of data will
2319 * be slow. (E.g. the data is stored on a tape drive.)
2320 * bit 31: Microsoft bit. If set, the tag is owned by Microsoft. User
2321 * defined tags have to use zero here.
2323 * These are the predefined reparse point tags:
2326 IO_REPARSE_TAG_IS_ALIAS = cpu_to_le32(0x20000000),
2327 IO_REPARSE_TAG_IS_HIGH_LATENCY = cpu_to_le32(0x40000000),
2328 IO_REPARSE_TAG_IS_MICROSOFT = cpu_to_le32(0x80000000),
2330 IO_REPARSE_TAG_RESERVED_ZERO = cpu_to_le32(0x00000000),
2331 IO_REPARSE_TAG_RESERVED_ONE = cpu_to_le32(0x00000001),
2332 IO_REPARSE_TAG_RESERVED_RANGE = cpu_to_le32(0x00000001),
2334 IO_REPARSE_TAG_NSS = cpu_to_le32(0x68000005),
2335 IO_REPARSE_TAG_NSS_RECOVER = cpu_to_le32(0x68000006),
2336 IO_REPARSE_TAG_SIS = cpu_to_le32(0x68000007),
2337 IO_REPARSE_TAG_DFS = cpu_to_le32(0x68000008),
2339 IO_REPARSE_TAG_MOUNT_POINT = cpu_to_le32(0x88000003),
2341 IO_REPARSE_TAG_HSM = cpu_to_le32(0xa8000004),
2343 IO_REPARSE_TAG_SYMBOLIC_LINK = cpu_to_le32(0xe8000000),
2345 IO_REPARSE_TAG_VALID_VALUES = cpu_to_le32(0xe000ffff),
2349 * Attribute: Reparse point (0xc0).
2351 * NOTE: Can be resident or non-resident.
2354 le32 reparse_tag; /* Reparse point type (inc. flags). */
2355 le16 reparse_data_length; /* Byte size of reparse data. */
2356 le16 reserved; /* Align to 8-byte boundary. */
2357 u8 reparse_data[0]; /* Meaning depends on reparse_tag. */
2358 } __attribute__ ((__packed__)) REPARSE_POINT;
2361 * Attribute: Extended attribute (EA) information (0xd0).
2363 * NOTE: Always resident. (Is this true???)
2366 le16 ea_length; /* Byte size of the packed extended
2368 le16 need_ea_count; /* The number of extended attributes which have
2369 the NEED_EA bit set. */
2370 le32 ea_query_length; /* Byte size of the buffer required to query
2371 the extended attributes when calling
2372 ZwQueryEaFile() in Windows NT/2k. I.e. the
2373 byte size of the unpacked extended
2375 } __attribute__ ((__packed__)) EA_INFORMATION;
2378 * Extended attribute flags (8-bit).
2381 NEED_EA = 0x80 /* If set the file to which the EA belongs
2382 cannot be interpreted without understanding
2383 the associates extended attributes. */
2384 } __attribute__ ((__packed__));
2386 typedef u8 EA_FLAGS;
2389 * Attribute: Extended attribute (EA) (0xe0).
2391 * NOTE: Can be resident or non-resident.
2393 * Like the attribute list and the index buffer list, the EA attribute value is
2394 * a sequence of EA_ATTR variable length records.
2397 le32 next_entry_offset; /* Offset to the next EA_ATTR. */
2398 EA_FLAGS flags; /* Flags describing the EA. */
2399 u8 ea_name_length; /* Length of the name of the EA in bytes
2400 excluding the '\0' byte terminator. */
2401 le16 ea_value_length; /* Byte size of the EA's value. */
2402 u8 ea_name[0]; /* Name of the EA. Note this is ASCII, not
2403 Unicode and it is zero terminated. */
2404 u8 ea_value[0]; /* The value of the EA. Immediately follows
2406 } __attribute__ ((__packed__)) EA_ATTR;
2409 * Attribute: Property set (0xf0).
2411 * Intended to support Native Structure Storage (NSS) - a feature removed from
2412 * NTFS 3.0 during beta testing.
2415 /* Irrelevant as feature unused. */
2416 } __attribute__ ((__packed__)) PROPERTY_SET;
2419 * Attribute: Logged utility stream (0x100).
2421 * NOTE: Can be resident or non-resident.
2423 * Operations on this attribute are logged to the journal ($LogFile) like
2424 * normal metadata changes.
2426 * Used by the Encrypting File System (EFS). All encrypted files have this
2427 * attribute with the name $EFS.
2430 /* Can be anything the creator chooses. */
2431 /* EFS uses it as follows: */
2432 // FIXME: Type this info, verifying it along the way. (AIA)
2433 } __attribute__ ((__packed__)) LOGGED_UTILITY_STREAM, EFS_ATTR;
2435 #endif /* _LINUX_NTFS_LAYOUT_H */
projects / linux-2.6 / blob