1 /* 2 * layout.h - All NTFS associated on-disk structures. Part of the Linux-NTFS 3 * project. 4 * 5 * Copyright (c) 2001-2005 Anton Altaparmakov 6 * Copyright (c) 2002 Richard Russon 7 * 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. 12 * 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. 17 * 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 22 */ 23 24 #ifndef _LINUX_NTFS_LAYOUT_H 25 #define _LINUX_NTFS_LAYOUT_H 26 27 #include <linux/types.h> 28 #include <linux/bitops.h> 29 #include <linux/list.h> 30 #include <asm/byteorder.h> 31 32 #include "types.h" 33 34 /* The NTFS oem_id "NTFS " */ 35 #define magicNTFS cpu_to_le64(0x202020205346544eULL) 36 37 /* 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. 46 */ 47 48 /* 49 * BIOS parameter block (bpb) structure. 50 */ 51 typedef struct { 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 */ 55 u8 fats; /* 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; 65 66 /* 67 * NTFS boot sector structure. 68 */ 69 typedef struct { 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 74 this is actually: 75 __u8 physical_drive; // 0x80 76 __u8 current_head; // zero 77 __u8 extended_boot_signature; 78 // 0x80 79 __u8 unused; // zero 80 */ 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; 99 100 /* 101 * Magic identifiers present at the beginning of all ntfs record containing 102 * records (like mft records for example). 103 */ 104 enum { 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+?) */ 109 110 /* Found in $LogFile/$DATA. */ 111 magic_RSTR = cpu_to_le32(0x52545352), /* Restart page. */ 112 magic_RCRD = cpu_to_le32(0x44524352), /* Log record page. */ 113 114 /* Found in $LogFile/$DATA. (May be found in $MFT/$DATA, also?) */ 115 magic_CHKD = cpu_to_le32(0x444b4843), /* Modified by chkdsk. */ 116 117 /* Found in all ntfs record containing records. */ 118 magic_BAAD = cpu_to_le32(0x44414142), /* Failed multi sector 119 transfer was detected. */ 120 /* 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. 123 */ 124 magic_empty = cpu_to_le32(0xffffffff) /* Record is empty. */ 125 }; 126 127 typedef le32 NTFS_RECORD_TYPE; 128 129 /* 130 * Generic magic comparison macros. Finally found a use for the ## preprocessor 131 * operator! (-8 132 */ 133 134 static inline bool __ntfs_is_magic(le32 x, NTFS_RECORD_TYPE r) 135 { 136 return (x == r); 137 } 138 #define ntfs_is_magic(x, m) __ntfs_is_magic(x, magic_##m) 139 140 static inline bool __ntfs_is_magicp(le32 *p, NTFS_RECORD_TYPE r) 141 { 142 return (*p == r); 143 } 144 #define ntfs_is_magicp(p, m) __ntfs_is_magicp(p, magic_##m) 145 146 /* 147 * Specialised magic comparison macros for the NTFS_RECORD_TYPEs defined above. 148 */ 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) ) 157 158 #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) ) 162 163 #define ntfs_is_chkd_record(x) ( ntfs_is_magic (x, CHKD) ) 164 #define ntfs_is_chkd_recordp(p) ( ntfs_is_magicp(p, CHKD) ) 165 166 #define ntfs_is_baad_record(x) ( ntfs_is_magic (x, BAAD) ) 167 #define ntfs_is_baad_recordp(p) ( ntfs_is_magicp(p, BAAD) ) 168 169 #define ntfs_is_empty_record(x) ( ntfs_is_magic (x, empty) ) 170 #define ntfs_is_empty_recordp(p) ( ntfs_is_magicp(p, empty) ) 171 172 /* 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. 187 */ 188 typedef struct { 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 196 minus 1. */ 197 } __attribute__ ((__packed__)) NTFS_RECORD; 198 199 /* 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 204 * never modified. 205 */ 206 typedef enum { 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 220 attribute. */ 221 FILE_root = 5, /* Root directory. */ 222 FILE_Bitmap = 6, /* Allocation bitmap of all clusters (lcns) in 223 data attribute. */ 224 FILE_Boot = 7, /* Boot sector (always at cluster 0) in data 225 attribute. */ 226 FILE_BadClus = 8, /* Contains all bad clusters in the non-resident 227 data attribute. */ 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. */ 243 } NTFS_SYSTEM_FILES; 244 245 /* 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. 248 */ 249 enum { 250 MFT_RECORD_IN_USE = cpu_to_le16(0x0001), 251 MFT_RECORD_IS_DIRECTORY = cpu_to_le16(0x0002), 252 } __attribute__ ((__packed__)); 253 254 typedef le16 MFT_RECORD_FLAGS; 255 256 /* 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. 259 * 260 * A reference consists of a 48-bit index into the mft and a 16-bit sequence 261 * number used to detect stale references. 262 * 263 * For error reporting purposes we treat the 48-bit index as a signed quantity. 264 * 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?). 269 * 270 * If the sequence number is zero it is assumed that no sequence number 271 * consistency checking should be performed. 272 * 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!" ?!? (-; 283 * 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 every time there is no more free space except for the mft zone until 290 * there really is no more free space. 291 */ 292 293 /* 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! 299 */ 300 #define MFT_REF_MASK_CPU 0x0000ffffffffffffULL 301 #define MFT_REF_MASK_LE cpu_to_le64(MFT_REF_MASK_CPU) 302 303 typedef u64 MFT_REF; 304 typedef le64 leMFT_REF; 305 306 #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)) 309 310 #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)) 314 315 #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))) 318 319 /* 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. 325 */ 326 typedef struct { 327 /*Ofs*/ 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. */ 332 333 /* 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 355 set to zero. */ 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 360 record size. */ 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 372 mft record). */ 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 */ 383 /* 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. 391 */ 392 } __attribute__ ((__packed__)) MFT_RECORD; 393 394 /* This is the version without the NTFS 3.1+ specific fields. */ 395 typedef struct { 396 /*Ofs*/ 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. */ 401 402 /* 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 424 set to zero. */ 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 429 record size. */ 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 441 mft record). */ 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 */ 449 /* 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. 457 */ 458 } __attribute__ ((__packed__)) MFT_RECORD_OLD; 459 460 /* 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... (-; 467 */ 468 enum { 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) 488 }; 489 490 typedef le32 ATTR_TYPE; 491 492 /* 493 * The collation rules for sorting views/indexes/etc (32-bit). 494 * 495 * COLLATION_BINARY - Collate by binary compare where the first byte is most 496 * significant. 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. 529 */ 530 enum { 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), 538 }; 539 540 typedef le32 COLLATION_RULE; 541 542 /* 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 548 * NT4. 549 */ 550 enum { 551 ATTR_DEF_INDEXABLE = cpu_to_le32(0x02), /* Attribute can be 552 indexed. */ 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 558 byte. */ 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 568 resident. */ 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 574 resident. */ 575 }; 576 577 typedef le32 ATTR_DEF_FLAGS; 578 579 /* 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. 587 */ 588 typedef struct { 589 /*hex ofs*/ 590 /* 0*/ ntfschar name[0x40]; /* Unicode name of the attribute. Zero 591 terminated. */ 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; 601 602 /* 603 * Attribute flags (16-bit). 604 */ 605 enum { 606 ATTR_IS_COMPRESSED = cpu_to_le16(0x0001), 607 ATTR_COMPRESSION_MASK = cpu_to_le16(0x00ff), /* Compression method 608 mask. Also, first 609 illegal value. */ 610 ATTR_IS_ENCRYPTED = cpu_to_le16(0x4000), 611 ATTR_IS_SPARSE = cpu_to_le16(0x8000), 612 } __attribute__ ((__packed__)); 613 614 typedef le16 ATTR_FLAGS; 615 616 /* 617 * Attribute compression. 618 * 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. 623 * 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). 628 * 629 * There are three different cases of how a compression block of X clusters 630 * can be stored: 631 * 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. 640 * 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. 650 * 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. 659 * 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 673 * length < X.) 674 * 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. 681 */ 682 683 /* 684 * Flags of resident attributes (8-bit). 685 */ 686 enum { 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__)); 691 692 typedef u8 RESIDENT_ATTR_FLAGS; 693 694 /* 695 * Attribute record header. Always aligned to 8-byte boundary. 696 */ 697 typedef struct { 698 /*Ofs*/ 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. 706 0 if unnamed. */ 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 715 boundary. */ 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). */ 721 /* 16*/ union { 722 /* Resident attributes. */ 723 struct { 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 731 of 8-bytes. */ 732 /* 22 */ RESIDENT_ATTR_FLAGS flags; /* See above. */ 733 /* 23 */ s8 reserved; /* Reserved/alignment to 8-byte 734 boundary. */ 735 } __attribute__ ((__packed__)) resident; 736 /* Non-resident attributes. */ 737 struct { 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" 748 attributes. */ 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 778 data_size. */ 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; 789 790 typedef ATTR_RECORD ATTR_REC; 791 792 /* 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. 796 * 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. 801 */ 802 enum { 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), */ 807 808 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), 814 815 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), 819 820 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), 823 824 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 obtain all flags that are valid for setting. */ 833 /* 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. 837 */ 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). */ 847 }; 848 849 typedef le32 FILE_ATTR_FLAGS; 850 851 /* 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.) 856 */ 857 858 /* 859 * Attribute: Standard information (0x10). 860 * 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. 867 */ 868 typedef struct { 869 /*Ofs*/ 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 873 modified. */ 874 /* 16*/ sle64 last_mft_change_time; /* Time this mft record was last 875 modified. */ 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. */ 885 /* 36*/ union { 886 /* NTFS 1.2 */ 887 struct { 888 /* 36*/ u8 reserved12[12]; /* Reserved/alignment to 8-byte 889 boundary. */ 890 } __attribute__ ((__packed__)) v1; 891 /* sizeof() = 48 bytes */ 892 /* NTFS 3.x */ 893 struct { 894 /* 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. 904 * else 905 * Use NTFS 1.2- format for access. 906 * } else 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 911 * attributes. 912 */ 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 934 for details. */ 935 } __attribute__ ((__packed__)) v3; 936 /* sizeof() = 72 bytes (NTFS 3.x) */ 937 } __attribute__ ((__packed__)) ver; 938 } __attribute__ ((__packed__)) STANDARD_INFORMATION; 939 940 /* 941 * Attribute: Attribute list (0x20). 942 * 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 958 * base mft record. 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 969 * NTFS 3.0 volumes). 970 * - There are many named streams. 971 */ 972 typedef struct { 973 /*Ofs*/ 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 992 as signed. */ 993 /* 16*/ leMFT_REF mft_reference;/* The reference of the mft record holding 994 the ATTR_RECORD for this portion of the 995 attribute value. */ 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 1000 name. */ 1001 /* sizeof() = 26 + (attribute_name_length * 2) bytes */ 1002 } __attribute__ ((__packed__)) ATTR_LIST_ENTRY; 1003 1004 /* 1005 * The maximum allowed length for a file name. 1006 */ 1007 #define MAXIMUM_FILE_NAME_LENGTH 255 1008 1009 /* 1010 * Possible namespaces for filenames in ntfs (8-bit). 1011 */ 1012 enum { 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__)); 1039 1040 typedef u8 FILE_NAME_TYPE_FLAGS; 1041 1042 /* 1043 * Attribute: Filename (0x30). 1044 * 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. 1054 */ 1055 typedef struct { 1056 /*hex ofs*/ 1057 /* 0*/ leMFT_REF parent_directory; /* Directory this filename is 1058 referenced from. */ 1059 /* 8*/ sle64 creation_time; /* Time file was created. */ 1060 /* 10*/ sle64 last_data_change_time; /* Time the data attribute was last 1061 modified. */ 1062 /* 18*/ sle64 last_mft_change_time; /* Time this mft record was last 1063 modified. */ 1064 /* 20*/ sle64 last_access_time; /* Time this mft record was last 1065 accessed. */ 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 1077 size. */ 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 $DATA 1081 attribute, this is always 0. */ 1082 /* 38*/ FILE_ATTR_FLAGS file_attributes; /* Flags describing the file. */ 1083 /* 3c*/ union { 1084 /* 3c*/ struct { 1085 /* 3c*/ le16 packed_ea_size; /* Size of the buffer needed to 1086 pack the extended attributes 1087 (EAs), if such are present.*/ 1088 /* 3e*/ le16 reserved; /* Reserved for alignment. */ 1089 } __attribute__ ((__packed__)) ea; 1090 /* 3c*/ struct { 1091 /* 3c*/ le32 reparse_point_tag; /* Type of reparse point, 1092 present only in reparse 1093 points and only if there are 1094 no EAs. */ 1095 } __attribute__ ((__packed__)) rp; 1096 } __attribute__ ((__packed__)) type; 1097 /* 40*/ u8 file_name_length; /* Length of file name in 1098 (Unicode) characters. */ 1099 /* 41*/ FILE_NAME_TYPE_FLAGS file_name_type; /* Namespace of the file name.*/ 1100 /* 42*/ ntfschar file_name[0]; /* File name in Unicode. */ 1101 } __attribute__ ((__packed__)) FILE_NAME_ATTR; 1102 1103 /* 1104 * GUID structures store globally unique identifiers (GUID). A GUID is a 1105 * 128-bit value consisting of one group of eight hexadecimal digits, followed 1106 * by three groups of four hexadecimal digits each, followed by one group of 1107 * twelve hexadecimal digits. GUIDs are Microsoft's implementation of the 1108 * distributed computing environment (DCE) universally unique identifier (UUID). 1109 * Example of a GUID: 1110 * 1F010768-5A73-BC91-0010A52216A7 1111 */ 1112 typedef struct { 1113 le32 data1; /* The first eight hexadecimal digits of the GUID. */ 1114 le16 data2; /* The first group of four hexadecimal digits. */ 1115 le16 data3; /* The second group of four hexadecimal digits. */ 1116 u8 data4[8]; /* The first two bytes are the third group of four 1117 hexadecimal digits. The remaining six bytes are the 1118 final 12 hexadecimal digits. */ 1119 } __attribute__ ((__packed__)) GUID; 1120 1121 /* 1122 * FILE_Extend/$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). 1131 */ 1132 typedef struct { 1133 leMFT_REF mft_reference;/* Mft record containing the object_id in 1134 the index entry key. */ 1135 union { 1136 struct { 1137 GUID birth_volume_id; 1138 GUID birth_object_id; 1139 GUID domain_id; 1140 } __attribute__ ((__packed__)) origin; 1141 u8 extended_info[48]; 1142 } __attribute__ ((__packed__)) opt; 1143 } __attribute__ ((__packed__)) OBJ_ID_INDEX_DATA; 1144 1145 /* 1146 * Attribute: Object id (NTFS 3.0+) (0x40). 1147 * 1148 * NOTE: Always resident. 1149 */ 1150 typedef struct { 1151 GUID object_id; /* Unique id assigned to the 1152 file.*/ 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. */ 1157 union { 1158 struct { 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 1162 first created. */ 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; 1168 1169 /* 1170 * The pre-defined IDENTIFIER_AUTHORITIES used as SID_IDENTIFIER_AUTHORITY in 1171 * the SID structure (see below). 1172 */ 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; 1181 1182 /* 1183 * These relative identifiers (RIDs) are used with the above identifier 1184 * authorities to make up universal well-known SIDs. 1185 * 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). 1191 */ 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 */ 1196 1197 SECURITY_CREATOR_OWNER_RID = 0, /* S-1-3 */ 1198 SECURITY_CREATOR_GROUP_RID = 1, /* S-1-3 */ 1199 1200 SECURITY_CREATOR_OWNER_SERVER_RID = 2, /* S-1-3 */ 1201 SECURITY_CREATOR_GROUP_SERVER_RID = 3, /* S-1-3 */ 1202 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, 1216 1217 SECURITY_LOGON_IDS_RID = 5, 1218 SECURITY_LOGON_IDS_RID_COUNT = 3, 1219 1220 SECURITY_LOCAL_SYSTEM_RID = 0x12, 1221 1222 SECURITY_NT_NON_UNIQUE = 0x15, 1223 1224 SECURITY_BUILTIN_DOMAIN_RID = 0x20, 1225 1226 /* 1227 * Well-known domain relative sub-authority values (RIDs). 1228 */ 1229 1230 /* Users. */ 1231 DOMAIN_USER_RID_ADMIN = 0x1f4, 1232 DOMAIN_USER_RID_GUEST = 0x1f5, 1233 DOMAIN_USER_RID_KRBTGT = 0x1f6, 1234 1235 /* Groups. */ 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, 1245 1246 /* Aliases. */ 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, 1251 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, 1256 1257 DOMAIN_ALIAS_RID_REPLICATOR = 0x228, 1258 DOMAIN_ALIAS_RID_RAS_SERVERS = 0x229, 1259 DOMAIN_ALIAS_RID_PREW2KCOMPACCESS = 0x22a, 1260 } RELATIVE_IDENTIFIERS; 1261 1262 /* 1263 * The universal well-known SIDs: 1264 * 1265 * NULL_SID S-1-0-0 1266 * WORLD_SID S-1-1-0 1267 * LOCAL_SID S-1-2-0 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 1272 * 1273 * (Non-unique IDs) S-1-4 1274 * 1275 * NT well-known SIDs: 1276 * 1277 * NT_AUTHORITY_SID S-1-5 1278 * DIALUP_SID S-1-5-1 1279 * 1280 * NETWORD_SID S-1-5-2 1281 * BATCH_SID S-1-5-3 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) 1285 * PROXY_SID S-1-5-8 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) 1291 * 1292 * (Logon IDs) S-1-5-5-X-Y 1293 * 1294 * (NT non-unique IDs) S-1-5-0x15-... 1295 * 1296 * (Built-in domain) S-1-5-0x20 1297 */ 1298 1299 /* 1300 * The SID_IDENTIFIER_AUTHORITY is a 48-bit value used in the SID structure. 1301 * 1302 * NOTE: This is stored as a big endian number, hence the high_part comes 1303 * before the low_part. 1304 */ 1305 typedef union { 1306 struct { 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; 1312 1313 /* 1314 * The SID structure is a variable-length structure used to uniquely identify 1315 * users or groups. SID stands for security identifier. 1316 * 1317 * The standard textual representation of the SID is of the form: 1318 * S-R-I-S-S... 1319 * Where: 1320 * - The first "S" is the literal character 'S' identifying the following 1321 * digits as a SID. 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. 1326 * 1327 * Example SID; the domain-relative SID of the local Administrators group on 1328 * Windows NT/2k: 1329 * S-1-5-32-544 1330 * This translates to a SID with: 1331 * revision = 1, 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 1336 */ 1337 typedef struct { 1338 u8 revision; 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; 1343 1344 /* 1345 * Current constants for SIDs. 1346 */ 1347 typedef enum { 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. */ 1352 } SID_CONSTANTS; 1353 1354 /* 1355 * The predefined ACE types (8-bit, see below). 1356 */ 1357 enum { 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, 1364 1365 ACCESS_ALLOWED_COMPOUND_ACE_TYPE= 4, 1366 ACCESS_MAX_MS_V3_ACE_TYPE = 4, 1367 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, 1375 1376 ACCESS_MAX_MS_V4_ACE_TYPE = 8, 1377 1378 /* This one is for WinNT/2k. */ 1379 ACCESS_MAX_MS_ACE_TYPE = 8, 1380 } __attribute__ ((__packed__)); 1381 1382 typedef u8 ACE_TYPES; 1383 1384 /* 1385 * The ACE flags (8-bit) for audit and inheritance (see below). 1386 * 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 1389 * accesses. 1390 * 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. 1393 */ 1394 enum { 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, 1402 1403 /* The audit flags. */ 1404 SUCCESSFUL_ACCESS_ACE_FLAG = 0x40, 1405 FAILED_ACCESS_ACE_FLAG = 0x80, 1406 } __attribute__ ((__packed__)); 1407 1408 typedef u8 ACE_FLAGS; 1409 1410 /* 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 1415 * identifier (SID). 1416 * 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. 1420 */ 1421 typedef struct { 1422 /*Ofs*/ 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; 1427 1428 /* 1429 * The access mask (32-bit). Defines the access rights. 1430 * 1431 * The specific rights (bits 0 to 15). These depend on the type of the object 1432 * being secured by the ACE. 1433 */ 1434 enum { 1435 /* Specific rights for files and directories are as follows: */ 1436 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), 1441 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), 1446 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), 1451 1452 /* Right to read extended attributes. (FILE/DIRECTORY) */ 1453 FILE_READ_EA = cpu_to_le32(0x00000008), 1454 1455 /* Right to write extended attributes. (FILE/DIRECTORY) */ 1456 FILE_WRITE_EA = cpu_to_le32(0x00000010), 1457 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), 1462 1463 /* 1464 * Right to delete a directory and all the files it contains (its 1465 * children), even if the files are read-only. (DIRECTORY) 1466 */ 1467 FILE_DELETE_CHILD = cpu_to_le32(0x00000040), 1468 1469 /* Right to read file attributes. (FILE/DIRECTORY) */ 1470 FILE_READ_ATTRIBUTES = cpu_to_le32(0x00000080), 1471 1472 /* Right to change file attributes. (FILE/DIRECTORY) */ 1473 FILE_WRITE_ATTRIBUTES = cpu_to_le32(0x00000100), 1474 1475 /* 1476 * The standard rights (bits 16 to 23). These are independent of the 1477 * type of object being secured. 1478 */ 1479 1480 /* Right to delete the object. */ 1481 DELETE = cpu_to_le32(0x00010000), 1482 1483 /* 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. 1487 */ 1488 READ_CONTROL = cpu_to_le32(0x00020000), 1489 1490 /* Right to modify the DACL in the object's security descriptor. */ 1491 WRITE_DAC = cpu_to_le32(0x00040000), 1492 1493 /* Right to change the owner in the object's security descriptor. */ 1494 WRITE_OWNER = cpu_to_le32(0x00080000), 1495 1496 /* 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. 1500 */ 1501 SYNCHRONIZE = cpu_to_le32(0x00100000), 1502 1503 /* 1504 * The following STANDARD_RIGHTS_* are combinations of the above for 1505 * convenience and are defined by the Win32 API. 1506 */ 1507 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), 1512 1513 /* Combines DELETE, READ_CONTROL, WRITE_DAC, and WRITE_OWNER access. */ 1514 STANDARD_RIGHTS_REQUIRED = cpu_to_le32(0x000f0000), 1515 1516 /* 1517 * Combines DELETE, READ_CONTROL, WRITE_DAC, WRITE_OWNER, and 1518 * SYNCHRONIZE access. 1519 */ 1520 STANDARD_RIGHTS_ALL = cpu_to_le32(0x001f0000), 1521 1522 /* 1523 * The access system ACL and maximum allowed access types (bits 24 to 1524 * 25, bits 26 to 27 are reserved). 1525 */ 1526 ACCESS_SYSTEM_SECURITY = cpu_to_le32(0x01000000), 1527 MAXIMUM_ALLOWED = cpu_to_le32(0x02000000), 1528 1529 /* 1530 * The generic rights (bits 28 to 31). These map onto the standard and 1531 * specific rights. 1532 */ 1533 1534 /* Read, write, and execute access. */ 1535 GENERIC_ALL = cpu_to_le32(0x10000000), 1536 1537 /* Execute access. */ 1538 GENERIC_EXECUTE = cpu_to_le32(0x20000000), 1539 1540 /* 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. 1546 */ 1547 GENERIC_WRITE = cpu_to_le32(0x40000000), 1548 1549 /* 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. 1555 */ 1556 GENERIC_READ = cpu_to_le32(0x80000000), 1557 }; 1558 1559 typedef le32 ACCESS_MASK; 1560 1561 /* 1562 * The generic mapping array. Used to denote the mapping of each generic 1563 * access right to a specific access mask. 1564 * 1565 * FIXME: What exactly is this and what is it for? (AIA) 1566 */ 1567 typedef struct { 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; 1573 1574 /* 1575 * The predefined ACE type structures are as defined below. 1576 */ 1577 1578 /* 1579 * ACCESS_ALLOWED_ACE, ACCESS_DENIED_ACE, SYSTEM_AUDIT_ACE, SYSTEM_ALARM_ACE 1580 */ 1581 typedef struct { 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. */ 1587 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; 1591 1592 /* 1593 * The object ACE flags (32-bit). 1594 */ 1595 enum { 1596 ACE_OBJECT_TYPE_PRESENT = cpu_to_le32(1), 1597 ACE_INHERITED_OBJECT_TYPE_PRESENT = cpu_to_le32(2), 1598 }; 1599 1600 typedef le32 OBJECT_ACE_FLAGS; 1601 1602 typedef struct { 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. */ 1608 1609 /* 8*/ OBJECT_ACE_FLAGS object_flags; /* Flags describing the object ACE. */ 1610 /* 12*/ GUID object_type; 1611 /* 28*/ GUID inherited_object_type; 1612 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; 1618 1619 /* 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. 1625 */ 1626 typedef struct { 1627 u8 revision; /* Revision of this ACL. */ 1628 u8 alignment1; 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. */ 1632 le16 alignment2; 1633 /* sizeof() = 8 bytes */ 1634 } __attribute__ ((__packed__)) ACL; 1635 1636 /* 1637 * Current constants for ACLs. 1638 */ 1639 typedef enum { 1640 /* Current revision. */ 1641 ACL_REVISION = 2, 1642 ACL_REVISION_DS = 4, 1643 1644 /* History of revisions. */ 1645 ACL_REVISION1 = 1, 1646 MIN_ACL_REVISION = 2, 1647 ACL_REVISION2 = 2, 1648 ACL_REVISION3 = 3, 1649 ACL_REVISION4 = 4, 1650 MAX_ACL_REVISION = 4, 1651 } ACL_CONSTANTS; 1652 1653 /* 1654 * The security descriptor control flags (16-bit). 1655 * 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 inheritance of an owner. 1661 * 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 * inheritance of a primary group. 1667 * 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. 1672 * 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 inheritance of an ACL. This flag is ignored if the 1678 * DaclPresent flag is not set. 1679 * 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. 1684 * 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 inheritance of an ACL. This flag is ignored if the 1690 * SaclPresent flag is not set. 1691 * 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. 1696 */ 1697 enum { 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), 1702 1703 SE_SACL_PRESENT = cpu_to_le16(0x0010), 1704 SE_SACL_DEFAULTED = cpu_to_le16(0x0020), 1705 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), 1710 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__)); 1716 1717 typedef le16 SECURITY_DESCRIPTOR_CONTROL; 1718 1719 /* 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. 1722 */ 1723 typedef struct { 1724 u8 revision; /* Revision level of the security descriptor. */ 1725 u8 alignment; 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 1730 the descriptor. */ 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 1737 is specified. */ 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; 1744 1745 /* 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. 1751 */ 1752 typedef struct { 1753 u8 revision; /* Revision level of the security descriptor. */ 1754 u8 alignment; 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 1759 descriptor. */ 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 1766 is specified. */ 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; 1772 1773 /* 1774 * Current constants for security descriptors. 1775 */ 1776 typedef enum { 1777 /* Current revision. */ 1778 SECURITY_DESCRIPTOR_REVISION = 1, 1779 SECURITY_DESCRIPTOR_REVISION1 = 1, 1780 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; 1785 1786 /* 1787 * Attribute: Security descriptor (0x50). A standard self-relative security 1788 * descriptor. 1789 * 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. 1794 */ 1795 typedef SECURITY_DESCRIPTOR_RELATIVE SECURITY_DESCRIPTOR_ATTR; 1796 1797 /* 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. 1800 * 1801 * FILE_Secure contains no unnamed data attribute, i.e. it has zero length. It 1802 * does, however, contain two indexes ($SDH and $SII) as well as a named data 1803 * stream ($SDS). 1804 * 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. 1810 * 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. 1819 * 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 1825 * directories). 1826 * 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. 1831 * 1832 * Note: Entries are never deleted from FILE_Secure, even if nothing 1833 * references an entry any more. 1834 */ 1835 1836 /* 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. 1839 */ 1840 typedef struct { 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; 1846 1847 /* 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. 1857 */ 1858 typedef struct { 1859 /*Ofs*/ 1860 /* 0 SECURITY_DESCRIPTOR_HEADER; -- Unfolded here as gcc doesn't like 1861 unnamed structs. */ 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 1867 descriptor. */ 1868 } __attribute__ ((__packed__)) SDS_ENTRY; 1869 1870 /* 1871 * The index entry key used in the $SII index. The collation type is 1872 * COLLATION_NTOFS_ULONG. 1873 */ 1874 typedef struct { 1875 le32 security_id; /* The security_id assigned to the descriptor. */ 1876 } __attribute__ ((__packed__)) SII_INDEX_KEY; 1877 1878 /* 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. 1882 */ 1883 typedef struct { 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; 1887 1888 /* 1889 * Attribute: Volume name (0x60). 1890 * 1891 * NOTE: Always resident. 1892 * NOTE: Present only in FILE_Volume. 1893 */ 1894 typedef struct { 1895 ntfschar name[0]; /* The name of the volume in Unicode. */ 1896 } __attribute__ ((__packed__)) VOLUME_NAME; 1897 1898 /* 1899 * Possible flags for the volume (16-bit). 1900 */ 1901 enum { 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), 1906 1907 VOLUME_DELETE_USN_UNDERWAY = cpu_to_le16(0x0010), 1908 VOLUME_REPAIR_OBJECT_ID = cpu_to_le16(0x0020), 1909 1910 VOLUME_CHKDSK_UNDERWAY = cpu_to_le16(0x4000), 1911 VOLUME_MODIFIED_BY_CHKDSK = cpu_to_le16(0x8000), 1912 1913 VOLUME_FLAGS_MASK = cpu_to_le16(0xc03f), 1914 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__)); 1918 1919 typedef le16 VOLUME_FLAGS; 1920 1921 /* 1922 * Attribute: Volume information (0x70). 1923 * 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. 1928 */ 1929 typedef struct { 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; 1935 1936 /* 1937 * Attribute: Data attribute (0x80). 1938 * 1939 * NOTE: Can be resident or non-resident. 1940 * 1941 * Data contents of a file (i.e. the unnamed stream) or of a named stream. 1942 */ 1943 typedef struct { 1944 u8 data[0]; /* The file's data contents. */ 1945 } __attribute__ ((__packed__)) DATA_ATTR; 1946 1947 /* 1948 * Index header flags (8-bit). 1949 */ 1950 enum { 1951 /* 1952 * When index header is in an index root attribute: 1953 */ 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 1959 present. */ 1960 /* 1961 * When index header is in an index block, i.e. is part of index 1962 * allocation attribute: 1963 */ 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 1967 node. */ 1968 NODE_MASK = 1, /* Mask for accessing the *_NODE bits. */ 1969 } __attribute__ ((__packed__)); 1970 1971 typedef u8 INDEX_HEADER_FLAGS; 1972 1973 /* 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. 1977 * 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. 1981 */ 1982 typedef struct { 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 1996 belongs to. */ 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; 2000 2001 /* 2002 * Attribute: Index root (0x90). 2003 * 2004 * NOTE: Always resident. 2005 * 2006 * This is followed by a sequence of index entries (INDEX_ENTRY structures) 2007 * as described by the index header. 2008 * 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 additional 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 2015 * index block. 2016 * 2017 * NOTE: The root directory (FILE_root) contains an entry for itself. Other 2018 * directories do not contain entries for themselves, though. 2019 */ 2020 typedef struct { 2021 ATTR_TYPE type; /* Type of the indexed attribute. Is 2022 $FILE_NAME for directories, zero 2023 for view indexes. No other values 2024 allowed. */ 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; 2042 2043 /* 2044 * Attribute: Index allocation (0xa0). 2045 * 2046 * NOTE: Always non-resident (doesn't make sense to be resident anyway!). 2047 * 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. 2051 */ 2052 typedef struct { 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. */ 2057 2058 /* 8*/ sle64 lsn; /* $LogFile sequence number of the last 2059 modification of this index block. */ 2060 /* 16*/ leVCN index_block_vcn; /* Virtual cluster number of the index block. 2061 If the cluster_size on the volume is <= the 2062 index_block_size of the directory, 2063 index_block_vcn counts in units of clusters, 2064 and in units of sectors otherwise. */ 2065 /* 24*/ INDEX_HEADER index; /* Describes the following index entries. */ 2066 /* sizeof()= 40 (0x28) bytes */ 2067 /* 2068 * When creating the index block, we place the update sequence array at this 2069 * offset, i.e. before we start with the index entries. This also makes sense, 2070 * otherwise we could run into problems with the update sequence array 2071 * containing in itself the last two bytes of a sector which would mean that 2072 * multi sector transfer protection wouldn't work. As you can't protect data 2073 * by overwriting it since you then can't get it back... 2074 * When reading use the data from the ntfs record header. 2075 */ 2076 } __attribute__ ((__packed__)) INDEX_BLOCK; 2077 2078 typedef INDEX_BLOCK INDEX_ALLOCATION; 2079 2080 /* 2081 * The system file FILE_Extend/$Reparse contains an index named $R listing 2082 * all reparse points on the volume. The index entry keys are as defined 2083 * below. Note, that there is no index data associated with the index entries. 2084 * 2085 * The index entries are sorted by the index key file_id. The collation rule is 2086 * COLLATION_NTOFS_ULONGS. FIXME: Verify whether the reparse_tag is not the 2087 * primary key / is not a key at all. (AIA) 2088 */ 2089 typedef struct { 2090 le32 reparse_tag; /* Reparse point type (inc. flags). */ 2091 leMFT_REF file_id; /* Mft record of the file containing the 2092 reparse point attribute. */ 2093 } __attribute__ ((__packed__)) REPARSE_INDEX_KEY; 2094 2095 /* 2096 * Quota flags (32-bit). 2097 * 2098 * The user quota flags. Names explain meaning. 2099 */ 2100 enum { 2101 QUOTA_FLAG_DEFAULT_LIMITS = cpu_to_le32(0x00000001), 2102 QUOTA_FLAG_LIMIT_REACHED = cpu_to_le32(0x00000002), 2103 QUOTA_FLAG_ID_DELETED = cpu_to_le32(0x00000004), 2104 2105 QUOTA_FLAG_USER_MASK = cpu_to_le32(0x00000007), 2106 /* This is a bit mask for the user quota flags. */ 2107 2108 /* 2109 * These flags are only present in the quota defaults index entry, i.e. 2110 * in the entry where owner_id = QUOTA_DEFAULTS_ID. 2111 */ 2112 QUOTA_FLAG_TRACKING_ENABLED = cpu_to_le32(0x00000010), 2113 QUOTA_FLAG_ENFORCEMENT_ENABLED = cpu_to_le32(0x00000020), 2114 QUOTA_FLAG_TRACKING_REQUESTED = cpu_to_le32(0x00000040), 2115 QUOTA_FLAG_LOG_THRESHOLD = cpu_to_le32(0x00000080), 2116 2117 QUOTA_FLAG_LOG_LIMIT = cpu_to_le32(0x00000100), 2118 QUOTA_FLAG_OUT_OF_DATE = cpu_to_le32(0x00000200), 2119 QUOTA_FLAG_CORRUPT = cpu_to_le32(0x00000400), 2120 QUOTA_FLAG_PENDING_DELETES = cpu_to_le32(0x00000800), 2121 }; 2122 2123 typedef le32 QUOTA_FLAGS; 2124 2125 /* 2126 * The system file FILE_Extend/$Quota contains two indexes $O and $Q. Quotas 2127 * are on a per volume and per user basis. 2128 * 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. 2134 * 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. 2139 * 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. 2143 * 2144 * The $Q index entry data is the quota control entry and is defined below. 2145 */ 2146 typedef struct { 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; 2159 2160 /* 2161 * Predefined owner_id values (32-bit). 2162 */ 2163 enum { 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), 2167 }; 2168 2169 /* 2170 * Current constants for quota control entries. 2171 */ 2172 typedef enum { 2173 /* Current version. */ 2174 QUOTA_VERSION = 2, 2175 } QUOTA_CONTROL_ENTRY_CONSTANTS; 2176 2177 /* 2178 * Index entry flags (16-bit). 2179 */ 2180 enum { 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. */ 2187 2188 INDEX_ENTRY_SPACE_FILLER = cpu_to_le16(0xffff), /* gcc: Force 2189 enum bit width to 16-bit. */ 2190 } __attribute__ ((__packed__)); 2191 2192 typedef le16 INDEX_ENTRY_FLAGS; 2193 2194 /* 2195 * This the index entry header (see below). 2196 */ 2197 typedef struct { 2198 /* 0*/ union { 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 2203 indexes. */ 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 2208 index key. */ 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 2214 8-bytes. */ 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; 2222 2223 /* 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. 2227 * 2228 * NOTE: Before NTFS 3.0 only filename attributes were indexed. 2229 */ 2230 typedef struct { 2231 /*Ofs*/ 2232 /* 0 INDEX_ENTRY_HEADER; -- Unfolded here as gcc dislikes unnamed structs. */ 2233 union { 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 2238 indexes. */ 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 2243 index key. */ 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 2249 8-bytes. */ 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. */ 2255 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 2274 the index. */ 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 // aligned 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; 2290 2291 /* 2292 * Attribute: Bitmap (0xb0). 2293 * 2294 * Contains an array of bits (aka a bitfield). 2295 * 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. 2300 */ 2301 typedef struct { 2302 u8 bitmap[0]; /* Array of bits. */ 2303 } __attribute__ ((__packed__)) BITMAP_ATTR; 2304 2305 /* 2306 * The reparse point tag defines the type of the reparse point. It also 2307 * includes several flags, which further describe the reparse point. 2308 * 2309 * The reparse point tag is an unsigned 32-bit value divided in three parts: 2310 * 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. 2322 * 2323 * These are the predefined reparse point tags: 2324 */ 2325 enum { 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), 2329 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), 2333 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), 2338 2339 IO_REPARSE_TAG_MOUNT_POINT = cpu_to_le32(0x88000003), 2340 2341 IO_REPARSE_TAG_HSM = cpu_to_le32(0xa8000004), 2342 2343 IO_REPARSE_TAG_SYMBOLIC_LINK = cpu_to_le32(0xe8000000), 2344 2345 IO_REPARSE_TAG_VALID_VALUES = cpu_to_le32(0xe000ffff), 2346 }; 2347 2348 /* 2349 * Attribute: Reparse point (0xc0). 2350 * 2351 * NOTE: Can be resident or non-resident. 2352 */ 2353 typedef struct { 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; 2359 2360 /* 2361 * Attribute: Extended attribute (EA) information (0xd0). 2362 * 2363 * NOTE: Always resident. (Is this true???) 2364 */ 2365 typedef struct { 2366 le16 ea_length; /* Byte size of the packed extended 2367 attributes. */ 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 2374 attributes. */ 2375 } __attribute__ ((__packed__)) EA_INFORMATION; 2376 2377 /* 2378 * Extended attribute flags (8-bit). 2379 */ 2380 enum { 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__)); 2385 2386 typedef u8 EA_FLAGS; 2387 2388 /* 2389 * Attribute: Extended attribute (EA) (0xe0). 2390 * 2391 * NOTE: Can be resident or non-resident. 2392 * 2393 * Like the attribute list and the index buffer list, the EA attribute value is 2394 * a sequence of EA_ATTR variable length records. 2395 */ 2396 typedef struct { 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 2405 the name. */ 2406 } __attribute__ ((__packed__)) EA_ATTR; 2407 2408 /* 2409 * Attribute: Property set (0xf0). 2410 * 2411 * Intended to support Native Structure Storage (NSS) - a feature removed from 2412 * NTFS 3.0 during beta testing. 2413 */ 2414 typedef struct { 2415 /* Irrelevant as feature unused. */ 2416 } __attribute__ ((__packed__)) PROPERTY_SET; 2417 2418 /* 2419 * Attribute: Logged utility stream (0x100). 2420 * 2421 * NOTE: Can be resident or non-resident. 2422 * 2423 * Operations on this attribute are logged to the journal ($LogFile) like 2424 * normal metadata changes. 2425 * 2426 * Used by the Encrypting File System (EFS). All encrypted files have this 2427 * attribute with the name $EFS. 2428 */ 2429 typedef struct { 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; 2434 2435 #endif /* _LINUX_NTFS_LAYOUT_H */ 2436