probe.h revision 801b0053336cc5fe5b3447ddad58505352a6578e
1/* 2 * probe.h - constants and on-disk structures for extracting device data 3 * 4 * Copyright (C) 1999 by Andries Brouwer 5 * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o 6 * Copyright (C) 2001 by Andreas Dilger 7 * 8 * %Begin-Header% 9 * This file may be redistributed under the terms of the 10 * GNU Lesser General Public License. 11 * %End-Header% 12 */ 13 14#ifndef _BLKID_PROBE_H 15#define _BLKID_PROBE_H 16 17#include <blkid/blkid_types.h> 18 19struct blkid_magic; 20 21#define SB_BUFFER_SIZE 0x11000 22 23struct blkid_probe { 24 int fd; 25 blkid_cache cache; 26 blkid_dev dev; 27 unsigned char *sbbuf; 28 size_t sb_valid; 29 unsigned char *buf; 30 size_t buf_max; 31}; 32 33typedef int (*blkid_probe_t)(struct blkid_probe *probe, 34 struct blkid_magic *id, unsigned char *buf); 35 36struct blkid_magic { 37 const char *bim_type; /* type name for this magic */ 38 long bim_kboff; /* kilobyte offset of superblock */ 39 unsigned bim_sboff; /* byte offset within superblock */ 40 unsigned bim_len; /* length of magic */ 41 const char *bim_magic; /* magic string */ 42 blkid_probe_t bim_probe; /* probe function */ 43}; 44 45/* 46 * Structures for each of the content types we want to extract information 47 * from. We do not necessarily need the magic field here, because we have 48 * already identified the content type before we get this far. It may still 49 * be useful if there are probe functions which handle multiple content types. 50 */ 51struct ext2_super_block { 52 __u32 s_inodes_count; 53 __u32 s_blocks_count; 54 __u32 s_r_blocks_count; 55 __u32 s_free_blocks_count; 56 __u32 s_free_inodes_count; 57 __u32 s_first_data_block; 58 __u32 s_log_block_size; 59 __u32 s_dummy3[7]; 60 unsigned char s_magic[2]; 61 __u16 s_state; 62 __u32 s_dummy5[8]; 63 __u32 s_feature_compat; 64 __u32 s_feature_incompat; 65 __u32 s_feature_ro_compat; 66 unsigned char s_uuid[16]; 67 char s_volume_name[16]; 68 char s_last_mounted[64]; 69 __u32 s_algorithm_usage_bitmap; 70 __u8 s_prealloc_blocks; 71 __u8 s_prealloc_dir_blocks; 72 __u16 s_reserved_gdt_blocks; 73 __u8 s_journal_uuid[16]; 74 __u32 s_journal_inum; 75 __u32 s_journal_dev; 76 __u32 s_last_orphan; 77 __u32 s_hash_seed[4]; 78 __u8 s_def_hash_version; 79 __u8 s_jnl_backup_type; 80 __u16 s_reserved_word_pad; 81 __u32 s_default_mount_opts; 82 __u32 s_first_meta_bg; 83 __u32 s_mkfs_time; 84 __u32 s_jnl_blocks[17]; 85 __u32 s_blocks_count_hi; 86 __u32 s_r_blocks_count_hi; 87 __u32 s_free_blocks_hi; 88 __u16 s_min_extra_isize; 89 __u16 s_want_extra_isize; 90 __u32 s_flags; 91 __u16 s_raid_stride; 92 __u16 s_mmp_interval; 93 __u64 s_mmp_block; 94 __u32 s_raid_stripe_width; 95 __u32 s_reserved[163]; 96}; 97 98/* for s_flags */ 99#define EXT2_FLAGS_TEST_FILESYS 0x0004 100 101/* for s_feature_compat */ 102#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 103 104/* for s_feature_ro_compat */ 105#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 106#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 107#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 108#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 109#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 110#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 111#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 112 113/* for s_feature_incompat */ 114#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 115#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 116#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 117#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 118#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */ 119#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 120#define EXT4_FEATURE_INCOMPAT_MMP 0x0100 121#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 122 123#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 124 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 125 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 126#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 127 EXT2_FEATURE_INCOMPAT_META_BG) 128#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 129#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 130 131#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 132 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 133 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 134#define EXT3_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 135 EXT3_FEATURE_INCOMPAT_RECOVER| \ 136 EXT2_FEATURE_INCOMPAT_META_BG) 137#define EXT3_FEATURE_INCOMPAT_UNSUPPORTED ~EXT3_FEATURE_INCOMPAT_SUPP 138#define EXT3_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT3_FEATURE_RO_COMPAT_SUPP 139 140 141struct xfs_super_block { 142 unsigned char xs_magic[4]; 143 __u32 xs_blocksize; 144 __u64 xs_dblocks; 145 __u64 xs_rblocks; 146 __u32 xs_dummy1[2]; 147 unsigned char xs_uuid[16]; 148 __u32 xs_dummy2[15]; 149 char xs_fname[12]; 150 __u32 xs_dummy3[2]; 151 __u64 xs_icount; 152 __u64 xs_ifree; 153 __u64 xs_fdblocks; 154}; 155 156struct reiserfs_super_block { 157 __u32 rs_blocks_count; 158 __u32 rs_free_blocks; 159 __u32 rs_root_block; 160 __u32 rs_journal_block; 161 __u32 rs_journal_dev; 162 __u32 rs_orig_journal_size; 163 __u32 rs_dummy2[5]; 164 __u16 rs_blocksize; 165 __u16 rs_dummy3[3]; 166 unsigned char rs_magic[12]; 167 __u32 rs_dummy4[5]; 168 unsigned char rs_uuid[16]; 169 char rs_label[16]; 170}; 171 172struct reiser4_super_block { 173 unsigned char rs4_magic[16]; 174 __u16 rs4_dummy[2]; 175 unsigned char rs4_uuid[16]; 176 unsigned char rs4_label[16]; 177 __u64 rs4_dummy2; 178}; 179 180struct jfs_super_block { 181 unsigned char js_magic[4]; 182 __u32 js_version; 183 __u64 js_size; 184 __u32 js_bsize; /* 4: aggregate block size in bytes */ 185 __u16 js_l2bsize; /* 2: log2 of s_bsize */ 186 __u16 js_l2bfactor; /* 2: log2(s_bsize/hardware block size) */ 187 __u32 js_pbsize; /* 4: hardware/LVM block size in bytes */ 188 __u16 js_l2pbsize; /* 2: log2 of s_pbsize */ 189 __u16 js_pad; /* 2: padding necessary for alignment */ 190 __u32 js_dummy2[26]; 191 unsigned char js_uuid[16]; 192 unsigned char js_label[16]; 193 unsigned char js_loguuid[16]; 194}; 195 196struct romfs_super_block { 197 unsigned char ros_magic[8]; 198 __u32 ros_dummy1[2]; 199 unsigned char ros_volume[16]; 200}; 201 202struct cramfs_super_block { 203 __u8 magic[4]; 204 __u32 size; 205 __u32 flags; 206 __u32 future; 207 __u8 signature[16]; 208 struct cramfs_info { 209 __u32 crc; 210 __u32 edition; 211 __u32 blocks; 212 __u32 files; 213 } info; 214 __u8 name[16]; 215}; 216 217struct swap_id_block { 218/* unsigned char sws_boot[1024]; */ 219 __u32 sws_version; 220 __u32 sws_lastpage; 221 __u32 sws_nrbad; 222 unsigned char sws_uuid[16]; 223 char sws_volume[16]; 224 unsigned char sws_pad[117]; 225 __u32 sws_badpg; 226}; 227 228/* Yucky misaligned values */ 229struct vfat_super_block { 230/* 00*/ unsigned char vs_ignored[3]; 231/* 03*/ unsigned char vs_sysid[8]; 232/* 0b*/ unsigned char vs_sector_size[2]; 233/* 0d*/ __u8 vs_cluster_size; 234/* 0e*/ __u16 vs_reserved; 235/* 10*/ __u8 vs_fats; 236/* 11*/ unsigned char vs_dir_entries[2]; 237/* 13*/ unsigned char vs_sectors[2]; 238/* 15*/ unsigned char vs_media; 239/* 16*/ __u16 vs_fat_length; 240/* 18*/ __u16 vs_secs_track; 241/* 1a*/ __u16 vs_heads; 242/* 1c*/ __u32 vs_hidden; 243/* 20*/ __u32 vs_total_sect; 244/* 24*/ __u32 vs_fat32_length; 245/* 28*/ __u16 vs_flags; 246/* 2a*/ __u8 vs_version[2]; 247/* 2c*/ __u32 vs_root_cluster; 248/* 30*/ __u16 vs_insfo_sector; 249/* 32*/ __u16 vs_backup_boot; 250/* 34*/ __u16 vs_reserved2[6]; 251/* 40*/ unsigned char vs_unknown[3]; 252/* 43*/ unsigned char vs_serno[4]; 253/* 47*/ unsigned char vs_label[11]; 254/* 52*/ unsigned char vs_magic[8]; 255/* 5a*/ unsigned char vs_dummy2[164]; 256/*1fe*/ unsigned char vs_pmagic[2]; 257}; 258 259/* Yucky misaligned values */ 260struct msdos_super_block { 261/* 00*/ unsigned char ms_ignored[3]; 262/* 03*/ unsigned char ms_sysid[8]; 263/* 0b*/ unsigned char ms_sector_size[2]; 264/* 0d*/ __u8 ms_cluster_size; 265/* 0e*/ __u16 ms_reserved; 266/* 10*/ __u8 ms_fats; 267/* 11*/ unsigned char ms_dir_entries[2]; 268/* 13*/ unsigned char ms_sectors[2]; 269/* 15*/ unsigned char ms_media; 270/* 16*/ __u16 ms_fat_length; 271/* 18*/ __u16 ms_secs_track; 272/* 1a*/ __u16 ms_heads; 273/* 1c*/ __u32 ms_hidden; 274/* 20*/ __u32 ms_total_sect; 275/* 24*/ unsigned char ms_unknown[3]; 276/* 27*/ unsigned char ms_serno[4]; 277/* 2b*/ unsigned char ms_label[11]; 278/* 36*/ unsigned char ms_magic[8]; 279/* 3d*/ unsigned char ms_dummy2[192]; 280/*1fe*/ unsigned char ms_pmagic[2]; 281}; 282 283struct vfat_dir_entry { 284 __u8 name[11]; 285 __u8 attr; 286 __u16 time_creat; 287 __u16 date_creat; 288 __u16 time_acc; 289 __u16 date_acc; 290 __u16 cluster_high; 291 __u16 time_write; 292 __u16 date_write; 293 __u16 cluster_low; 294 __u32 size; 295}; 296 297/* maximum number of clusters */ 298#define FAT12_MAX 0xFF4 299#define FAT16_MAX 0xFFF4 300#define FAT32_MAX 0x0FFFFFF6 301 302struct minix_super_block { 303 __u16 ms_ninodes; 304 __u16 ms_nzones; 305 __u16 ms_imap_blocks; 306 __u16 ms_zmap_blocks; 307 __u16 ms_firstdatazone; 308 __u16 ms_log_zone_size; 309 __u32 ms_max_size; 310 unsigned char ms_magic[2]; 311 __u16 ms_state; 312 __u32 ms_zones; 313}; 314 315struct mdp_superblock_s { 316 __u32 md_magic; 317 __u32 major_version; 318 __u32 minor_version; 319 __u32 patch_version; 320 __u32 gvalid_words; 321 __u32 set_uuid0; 322 __u32 ctime; 323 __u32 level; 324 __u32 size; 325 __u32 nr_disks; 326 __u32 raid_disks; 327 __u32 md_minor; 328 __u32 not_persistent; 329 __u32 set_uuid1; 330 __u32 set_uuid2; 331 __u32 set_uuid3; 332}; 333 334struct hfs_super_block { 335 char h_magic[2]; 336 char h_dummy[18]; 337 __u32 h_blksize; 338}; 339 340struct ocfs_volume_header { 341 unsigned char minor_version[4]; 342 unsigned char major_version[4]; 343 unsigned char signature[128]; 344 char mount[128]; 345 unsigned char mount_len[2]; 346}; 347 348struct ocfs_volume_label { 349 unsigned char disk_lock[48]; 350 char label[64]; 351 unsigned char label_len[2]; 352 unsigned char vol_id[16]; 353 unsigned char vol_id_len[2]; 354}; 355 356#define ocfsmajor(o) ((__u32)o.major_version[0] \ 357 + (((__u32) o.major_version[1]) << 8) \ 358 + (((__u32) o.major_version[2]) << 16) \ 359 + (((__u32) o.major_version[3]) << 24)) 360#define ocfslabellen(o) ((__u32)o.label_len[0] + (((__u32) o.label_len[1]) << 8)) 361#define ocfsmountlen(o) ((__u32)o.mount_len[0] + (((__u32) o.mount_len[1])<<8)) 362 363#define OCFS_MAGIC "OracleCFS" 364 365struct ocfs2_super_block { 366 unsigned char signature[8]; 367 unsigned char s_dummy1[184]; 368 unsigned char s_dummy2[80]; 369 char s_label[64]; 370 unsigned char s_uuid[16]; 371}; 372 373#define OCFS2_MIN_BLOCKSIZE 512 374#define OCFS2_MAX_BLOCKSIZE 4096 375 376#define OCFS2_SUPER_BLOCK_BLKNO 2 377 378#define OCFS2_SUPER_BLOCK_SIGNATURE "OCFSV2" 379 380struct oracle_asm_disk_label { 381 char dummy[32]; 382 char dl_tag[8]; 383 char dl_id[24]; 384}; 385 386#define ORACLE_ASM_DISK_LABEL_MARKED "ORCLDISK" 387#define ORACLE_ASM_DISK_LABEL_OFFSET 32 388 389struct iso_volume_descriptor { 390 unsigned char vd_type; 391 unsigned char vd_id[5]; 392 unsigned char vd_version; 393 unsigned char flags; 394 unsigned char system_id[32]; 395 unsigned char volume_id[32]; 396 unsigned char unused[8]; 397 unsigned char space_size[8]; 398 unsigned char escape_sequences[8]; 399}; 400 401/* Common gfs/gfs2 constants: */ 402#define GFS_MAGIC 0x01161970 403#define GFS_DEFAULT_BSIZE 4096 404#define GFS_SUPERBLOCK_OFFSET (0x10 * GFS_DEFAULT_BSIZE) 405#define GFS_METATYPE_SB 1 406#define GFS_FORMAT_SB 100 407#define GFS_LOCKNAME_LEN 64 408 409/* gfs1 constants: */ 410#define GFS_FORMAT_FS 1309 411#define GFS_FORMAT_MULTI 1401 412/* gfs2 constants: */ 413#define GFS2_FORMAT_FS 1801 414#define GFS2_FORMAT_MULTI 1900 415 416struct gfs2_meta_header { 417 __u32 mh_magic; 418 __u32 mh_type; 419 __u64 __pad0; /* Was generation number in gfs1 */ 420 __u32 mh_format; 421 __u32 __pad1; /* Was incarnation number in gfs1 */ 422}; 423 424struct gfs2_inum { 425 __u64 no_formal_ino; 426 __u64 no_addr; 427}; 428 429struct gfs2_sb { 430 struct gfs2_meta_header sb_header; 431 432 __u32 sb_fs_format; 433 __u32 sb_multihost_format; 434 __u32 __pad0; /* Was superblock flags in gfs1 */ 435 436 __u32 sb_bsize; 437 __u32 sb_bsize_shift; 438 __u32 __pad1; /* Was journal segment size in gfs1 */ 439 440 struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */ 441 struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */ 442 struct gfs2_inum sb_root_dir; 443 444 char sb_lockproto[GFS_LOCKNAME_LEN]; 445 char sb_locktable[GFS_LOCKNAME_LEN]; 446 /* In gfs1, quota and license dinodes followed */ 447}; 448 449struct ntfs_super_block { 450 __u8 jump[3]; 451 __u8 oem_id[8]; 452 __u8 bios_parameter_block[25]; 453 __u16 unused[2]; 454 __u64 number_of_sectors; 455 __u64 mft_cluster_location; 456 __u64 mft_mirror_cluster_location; 457 __s8 cluster_per_mft_record; 458 __u8 reserved1[3]; 459 __s8 cluster_per_index_record; 460 __u8 reserved2[3]; 461 __u64 volume_serial; 462 __u16 checksum; 463}; 464 465struct master_file_table_record { 466 __u32 magic; 467 __u16 usa_ofs; 468 __u16 usa_count; 469 __u64 lsn; 470 __u16 sequence_number; 471 __u16 link_count; 472 __u16 attrs_offset; 473 __u16 flags; 474 __u32 bytes_in_use; 475 __u32 bytes_allocated; 476} __attribute__((__packed__)); 477 478struct file_attribute { 479 __u32 type; 480 __u32 len; 481 __u8 non_resident; 482 __u8 name_len; 483 __u16 name_offset; 484 __u16 flags; 485 __u16 instance; 486 __u32 value_len; 487 __u16 value_offset; 488} __attribute__((__packed__)); 489 490#define MFT_RECORD_VOLUME 3 491#define MFT_RECORD_ATTR_VOLUME_NAME 0x60 492#define MFT_RECORD_ATTR_VOLUME_INFO 0x70 493#define MFT_RECORD_ATTR_OBJECT_ID 0x40 494#define MFT_RECORD_ATTR_END 0xffffffffu 495 496/* HFS / HFS+ */ 497struct hfs_finder_info { 498 __u32 boot_folder; 499 __u32 start_app; 500 __u32 open_folder; 501 __u32 os9_folder; 502 __u32 reserved; 503 __u32 osx_folder; 504 __u8 id[8]; 505} __attribute__((packed)); 506 507struct hfs_mdb { 508 __u8 signature[2]; 509 __u32 cr_date; 510 __u32 ls_Mod; 511 __u16 atrb; 512 __u16 nm_fls; 513 __u16 vbm_st; 514 __u16 alloc_ptr; 515 __u16 nm_al_blks; 516 __u32 al_blk_size; 517 __u32 clp_size; 518 __u16 al_bl_st; 519 __u32 nxt_cnid; 520 __u16 free_bks; 521 __u8 label_len; 522 __u8 label[27]; 523 __u32 vol_bkup; 524 __u16 vol_seq_num; 525 __u32 wr_cnt; 526 __u32 xt_clump_size; 527 __u32 ct_clump_size; 528 __u16 num_root_dirs; 529 __u32 file_count; 530 __u32 dir_count; 531 struct hfs_finder_info finder_info; 532 __u8 embed_sig[2]; 533 __u16 embed_startblock; 534 __u16 embed_blockcount; 535} __attribute__((packed)); 536 537 538#define HFS_NODE_LEAF 0xff 539#define HFSPLUS_POR_CNID 1 540 541struct hfsplus_bnode_descriptor { 542 __u32 next; 543 __u32 prev; 544 __u8 type; 545 __u8 height; 546 __u16 num_recs; 547 __u16 reserved; 548} __attribute__((packed)); 549 550struct hfsplus_bheader_record { 551 __u16 depth; 552 __u32 root; 553 __u32 leaf_count; 554 __u32 leaf_head; 555 __u32 leaf_tail; 556 __u16 node_size; 557} __attribute__((packed)); 558 559struct hfsplus_catalog_key { 560 __u16 key_len; 561 __u32 parent_id; 562 __u16 unicode_len; 563 __u8 unicode[255 * 2]; 564} __attribute__((packed)); 565 566struct hfsplus_extent { 567 __u32 start_block; 568 __u32 block_count; 569} __attribute__((packed)); 570 571#define HFSPLUS_EXTENT_COUNT 8 572struct hfsplus_fork { 573 __u64 total_size; 574 __u32 clump_size; 575 __u32 total_blocks; 576 struct hfsplus_extent extents[HFSPLUS_EXTENT_COUNT]; 577} __attribute__((packed)); 578 579struct hfsplus_vol_header { 580 __u8 signature[2]; 581 __u16 version; 582 __u32 attributes; 583 __u32 last_mount_vers; 584 __u32 reserved; 585 __u32 create_date; 586 __u32 modify_date; 587 __u32 backup_date; 588 __u32 checked_date; 589 __u32 file_count; 590 __u32 folder_count; 591 __u32 blocksize; 592 __u32 total_blocks; 593 __u32 free_blocks; 594 __u32 next_alloc; 595 __u32 rsrc_clump_sz; 596 __u32 data_clump_sz; 597 __u32 next_cnid; 598 __u32 write_count; 599 __u64 encodings_bmp; 600 struct hfs_finder_info finder_info; 601 struct hfsplus_fork alloc_file; 602 struct hfsplus_fork ext_file; 603 struct hfsplus_fork cat_file; 604 struct hfsplus_fork attr_file; 605 struct hfsplus_fork start_file; 606} __attribute__((packed)); 607 608 609/* this is lvm's label_header & pv_header combined. */ 610 611#define LVM2_ID_LEN 32 612 613struct lvm2_pv_label_header { 614 /* label_header */ 615 __u8 id[8]; /* LABELONE */ 616 __u64 sector_xl; /* Sector number of this label */ 617 __u32 crc_xl; /* From next field to end of sector */ 618 __u32 offset_xl; /* Offset from start of struct to contents */ 619 __u8 type[8]; /* LVM2 001 */ 620 /* pv_header */ 621 __u8 pv_uuid[LVM2_ID_LEN]; 622} __attribute__ ((packed)); 623 624 625/* 626 * this is a very generous portion of the super block, giving us 627 * room to translate 14 chunks with 3 stripes each. 628 */ 629#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048 630#define BTRFS_LABEL_SIZE 256 631#define BTRFS_UUID_SIZE 16 632#define BTRFS_FSID_SIZE 16 633#define BTRFS_CSUM_SIZE 32 634 635struct btrfs_dev_item { 636 /* the internal btrfs device id */ 637 __u64 devid; 638 639 /* size of the device */ 640 __u64 total_bytes; 641 642 /* bytes used */ 643 __u64 bytes_used; 644 645 /* optimal io alignment for this device */ 646 __u32 io_align; 647 648 /* optimal io width for this device */ 649 __u32 io_width; 650 651 /* minimal io size for this device */ 652 __u32 sector_size; 653 654 /* type and info about this device */ 655 __u64 type; 656 657 /* expected generation for this device */ 658 __u64 generation; 659 660 /* 661 * starting byte of this partition on the device, 662 * to allowr for stripe alignment in the future 663 */ 664 __u64 start_offset; 665 666 /* grouping information for allocation decisions */ 667 __u32 dev_group; 668 669 /* seek speed 0-100 where 100 is fastest */ 670 __u8 seek_speed; 671 672 /* bandwidth 0-100 where 100 is fastest */ 673 __u8 bandwidth; 674 675 /* btrfs generated uuid for this device */ 676 __u8 uuid[BTRFS_UUID_SIZE]; 677 678 /* uuid of FS who owns this device */ 679 __u8 fsid[BTRFS_UUID_SIZE]; 680} __attribute__ ((__packed__)); 681 682/* 683 * the super block basically lists the main trees of the FS 684 * it currently lacks any block count etc etc 685 */ 686struct btrfs_super_block { 687 __u8 csum[BTRFS_CSUM_SIZE]; 688 /* the first 3 fields must match struct btrfs_header */ 689 __u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 690 __u64 bytenr; /* this block number */ 691 __u64 flags; 692 693 /* allowed to be different from the btrfs_header from here own down */ 694 __u64 magic; 695 __u64 generation; 696 __u64 root; 697 __u64 chunk_root; 698 __u64 log_root; 699 700 /* this will help find the new super based on the log root */ 701 __u64 log_root_transid; 702 __u64 total_bytes; 703 __u64 bytes_used; 704 __u64 root_dir_objectid; 705 __u64 num_devices; 706 __u32 sectorsize; 707 __u32 nodesize; 708 __u32 leafsize; 709 __u32 stripesize; 710 __u32 sys_chunk_array_size; 711 __u64 chunk_root_generation; 712 __u64 compat_flags; 713 __u64 compat_ro_flags; 714 __u64 incompat_flags; 715 __u16 csum_type; 716 __u8 root_level; 717 __u8 chunk_root_level; 718 __u8 log_root_level; 719 struct btrfs_dev_item dev_item; 720 721 char label[BTRFS_LABEL_SIZE]; 722 723 /* future expansion */ 724 __u64 reserved[32]; 725 __u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE]; 726} __attribute__ ((__packed__)); 727 728/* 729 * Byte swap functions 730 */ 731#ifdef __GNUC__ 732#define _INLINE_ static __inline__ 733#else /* For Watcom C */ 734#define _INLINE_ static inline 735#endif 736 737static __u16 blkid_swab16(__u16 val); 738static __u32 blkid_swab32(__u32 val); 739static __u64 blkid_swab64(__u64 val); 740 741#if ((defined __GNUC__) && \ 742 (defined(__i386__) || defined(__i486__) || defined(__i586__))) 743 744#define _BLKID_HAVE_ASM_BITOPS_ 745 746_INLINE_ __u32 blkid_swab32(__u32 val) 747{ 748#ifdef EXT2FS_REQUIRE_486 749 __asm__("bswap %0" : "=r" (val) : "0" (val)); 750#else 751 __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */ 752 "rorl $16,%0\n\t" /* swap words */ 753 "xchgb %b0,%h0" /* swap higher bytes */ 754 :"=q" (val) 755 : "0" (val)); 756#endif 757 return val; 758} 759 760_INLINE_ __u16 blkid_swab16(__u16 val) 761{ 762 __asm__("xchgb %b0,%h0" /* swap bytes */ \ 763 : "=q" (val) \ 764 : "0" (val)); \ 765 return val; 766} 767 768_INLINE_ __u64 blkid_swab64(__u64 val) 769{ 770 return (blkid_swab32(val >> 32) | 771 (((__u64) blkid_swab32(val & 0xFFFFFFFFUL)) << 32)); 772} 773#endif 774 775#if !defined(_BLKID_HAVE_ASM_BITOPS_) 776 777_INLINE_ __u16 blkid_swab16(__u16 val) 778{ 779 return (val >> 8) | (val << 8); 780} 781 782_INLINE_ __u32 blkid_swab32(__u32 val) 783{ 784 return ((val>>24) | ((val>>8)&0xFF00) | 785 ((val<<8)&0xFF0000) | (val<<24)); 786} 787 788_INLINE_ __u64 blkid_swab64(__u64 val) 789{ 790 return (blkid_swab32(val >> 32) | 791 (((__u64) blkid_swab32(val & 0xFFFFFFFFUL)) << 32)); 792} 793#endif 794 795 796 797#ifdef WORDS_BIGENDIAN 798#define blkid_le16(x) blkid_swab16(x) 799#define blkid_le32(x) blkid_swab32(x) 800#define blkid_le64(x) blkid_swab64(x) 801#define blkid_be16(x) (x) 802#define blkid_be32(x) (x) 803#define blkid_be64(x) (x) 804#else 805#define blkid_le16(x) (x) 806#define blkid_le32(x) (x) 807#define blkid_le64(x) (x) 808#define blkid_be16(x) blkid_swab16(x) 809#define blkid_be32(x) blkid_swab32(x) 810#define blkid_be64(x) blkid_swab64(x) 811#endif 812 813#undef _INLINE_ 814 815#endif /* _BLKID_PROBE_H */ 816