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
19 struct blkid_magic;
20
21 #define SB_BUFFER_SIZE 0x11000
22
23 struct 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
33 typedef int (*blkid_probe_t)(struct blkid_probe *probe,
34 struct blkid_magic *id, unsigned char *buf);
35
36 struct 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 */
51 struct 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
141 struct 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
156 struct 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
172 struct 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
180 struct 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
196 struct romfs_super_block {
197 unsigned char ros_magic[8];
198 __u32 ros_dummy1[2];
199 unsigned char ros_volume[16];
200 };
201
202 struct 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
217 struct 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 */
229 struct 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 */
260 struct 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
283 struct 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
302 struct 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
315 struct 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
334 struct hfs_super_block {
335 char h_magic[2];
336 char h_dummy[18];
337 __u32 h_blksize;
338 };
339
340 struct 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
348 struct 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
365 struct 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
380 struct 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
389 struct 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
416 struct 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
424 struct gfs2_inum {
425 __u64 no_formal_ino;
426 __u64 no_addr;
427 };
428
429 struct 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
449 struct 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
465 struct 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
478 struct 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+ */
497 struct 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
507 struct 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
541 struct 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
550 struct 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
559 struct hfsplus_catalog_key {
560 __u16 key_len;
561 __u32 parent_id;
562 __u16 unicode_len;
563 __u8 unicode[255 * 2];
564 } __attribute__((packed));
565
566 struct hfsplus_extent {
567 __u32 start_block;
568 __u32 block_count;
569 } __attribute__((packed));
570
571 #define HFSPLUS_EXTENT_COUNT 8
572 struct 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
579 struct 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
613 struct 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
635 struct 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 */
686 struct 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
737 static __u16 blkid_swab16(__u16 val);
738 static __u32 blkid_swab32(__u32 val);
739 static __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
blkid_swab32(__u32 val)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
blkid_swab16(__u16 val)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
blkid_swab64(__u64 val)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
blkid_swab16(__u16 val)777 _INLINE_ __u16 blkid_swab16(__u16 val)
778 {
779 return (val >> 8) | (val << 8);
780 }
781
blkid_swab32(__u32 val)782 _INLINE_ __u32 blkid_swab32(__u32 val)
783 {
784 return ((val>>24) | ((val>>8)&0xFF00) |
785 ((val<<8)&0xFF0000) | (val<<24));
786 }
787
blkid_swab64(__u64 val)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