1 /* SPDX-License-Identifier: LGPL-2.1+ WITH Linux-syscall-note */ 2 /* 3 * nilfs2_ondisk.h - NILFS2 on-disk structures 4 * 5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU Lesser General Public License as published 9 * by the Free Software Foundation; either version 2.1 of the License, or 10 * (at your option) any later version. 11 */ 12 /* 13 * linux/include/linux/ext2_fs.h 14 * 15 * Copyright (C) 1992, 1993, 1994, 1995 16 * Remy Card ([email protected]) 17 * Laboratoire MASI - Institut Blaise Pascal 18 * Universite Pierre et Marie Curie (Paris VI) 19 * 20 * from 21 * 22 * linux/include/linux/minix_fs.h 23 * 24 * Copyright (C) 1991, 1992 Linus Torvalds 25 */ 26 27 #ifndef _LINUX_NILFS2_ONDISK_H 28 #define _LINUX_NILFS2_ONDISK_H 29 30 #include <linux/types.h> 31 #include <linux/magic.h> 32 #include <asm/byteorder.h> 33 34 #define NILFS_INODE_BMAP_SIZE 7 35 36 /** 37 * struct nilfs_inode - structure of an inode on disk 38 * @i_blocks: blocks count 39 * @i_size: size in bytes 40 * @i_ctime: creation time (seconds) 41 * @i_mtime: modification time (seconds) 42 * @i_ctime_nsec: creation time (nano seconds) 43 * @i_mtime_nsec: modification time (nano seconds) 44 * @i_uid: user id 45 * @i_gid: group id 46 * @i_mode: file mode 47 * @i_links_count: links count 48 * @i_flags: file flags 49 * @i_bmap: block mapping 50 * @i_xattr: extended attributes 51 * @i_generation: file generation (for NFS) 52 * @i_pad: padding 53 */ 54 struct nilfs_inode { 55 __le64 i_blocks; 56 __le64 i_size; 57 __le64 i_ctime; 58 __le64 i_mtime; 59 __le32 i_ctime_nsec; 60 __le32 i_mtime_nsec; 61 __le32 i_uid; 62 __le32 i_gid; 63 __le16 i_mode; 64 __le16 i_links_count; 65 __le32 i_flags; 66 __le64 i_bmap[NILFS_INODE_BMAP_SIZE]; 67 #define i_device_code i_bmap[0] 68 __le64 i_xattr; 69 __le32 i_generation; 70 __le32 i_pad; 71 }; 72 73 #define NILFS_MIN_INODE_SIZE 128 74 75 /** 76 * struct nilfs_super_root - structure of super root 77 * @sr_sum: check sum 78 * @sr_bytes: byte count of the structure 79 * @sr_flags: flags (reserved) 80 * @sr_nongc_ctime: write time of the last segment not for cleaner operation 81 * @sr_dat: DAT file inode 82 * @sr_cpfile: checkpoint file inode 83 * @sr_sufile: segment usage file inode 84 */ 85 struct nilfs_super_root { 86 __le32 sr_sum; 87 __le16 sr_bytes; 88 __le16 sr_flags; 89 __le64 sr_nongc_ctime; 90 struct nilfs_inode sr_dat; 91 struct nilfs_inode sr_cpfile; 92 struct nilfs_inode sr_sufile; 93 }; 94 95 #define NILFS_SR_MDT_OFFSET(inode_size, i) \ 96 ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \ 97 (inode_size) * (i)) 98 #define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0) 99 #define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1) 100 #define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2) 101 #define NILFS_SR_BYTES(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 3) 102 103 /* 104 * Maximal mount counts 105 */ 106 #define NILFS_DFL_MAX_MNT_COUNT 50 /* 50 mounts */ 107 108 /* 109 * File system states (sbp->s_state, nilfs->ns_mount_state) 110 */ 111 #define NILFS_VALID_FS 0x0001 /* Unmounted cleanly */ 112 #define NILFS_ERROR_FS 0x0002 /* Errors detected */ 113 #define NILFS_RESIZE_FS 0x0004 /* Resize required */ 114 115 /* 116 * Mount flags (sbi->s_mount_opt) 117 */ 118 #define NILFS_MOUNT_ERROR_MODE 0x0070 /* Error mode mask */ 119 #define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 120 #define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 121 #define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 122 #define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */ 123 #define NILFS_MOUNT_STRICT_ORDER 0x2000 /* 124 * Apply strict in-order 125 * semantics also for data 126 */ 127 #define NILFS_MOUNT_NORECOVERY 0x4000 /* 128 * Disable write access during 129 * mount-time recovery 130 */ 131 #define NILFS_MOUNT_DISCARD 0x8000 /* Issue DISCARD requests */ 132 133 134 /** 135 * struct nilfs_super_block - structure of super block on disk 136 */ 137 struct nilfs_super_block { 138 /*00*/ __le32 s_rev_level; /* Revision level */ 139 __le16 s_minor_rev_level; /* minor revision level */ 140 __le16 s_magic; /* Magic signature */ 141 142 __le16 s_bytes; /* 143 * Bytes count of CRC calculation 144 * for this structure. s_reserved 145 * is excluded. 146 */ 147 __le16 s_flags; /* flags */ 148 __le32 s_crc_seed; /* Seed value of CRC calculation */ 149 /*10*/ __le32 s_sum; /* Check sum of super block */ 150 151 __le32 s_log_block_size; /* 152 * Block size represented as follows 153 * blocksize = 154 * 1 << (s_log_block_size + 10) 155 */ 156 __le64 s_nsegments; /* Number of segments in filesystem */ 157 /*20*/ __le64 s_dev_size; /* block device size in bytes */ 158 __le64 s_first_data_block; /* 1st seg disk block number */ 159 /*30*/ __le32 s_blocks_per_segment; /* number of blocks per full segment */ 160 __le32 s_r_segments_percentage; /* Reserved segments percentage */ 161 162 __le64 s_last_cno; /* Last checkpoint number */ 163 /*40*/ __le64 s_last_pseg; /* disk block addr pseg written last */ 164 __le64 s_last_seq; /* seq. number of seg written last */ 165 /*50*/ __le64 s_free_blocks_count; /* Free blocks count */ 166 167 __le64 s_ctime; /* 168 * Creation time (execution time of 169 * newfs) 170 */ 171 /*60*/ __le64 s_mtime; /* Mount time */ 172 __le64 s_wtime; /* Write time */ 173 /*70*/ __le16 s_mnt_count; /* Mount count */ 174 __le16 s_max_mnt_count; /* Maximal mount count */ 175 __le16 s_state; /* File system state */ 176 __le16 s_errors; /* Behaviour when detecting errors */ 177 __le64 s_lastcheck; /* time of last check */ 178 179 /*80*/ __le32 s_checkinterval; /* max. time between checks */ 180 __le32 s_creator_os; /* OS */ 181 __le16 s_def_resuid; /* Default uid for reserved blocks */ 182 __le16 s_def_resgid; /* Default gid for reserved blocks */ 183 __le32 s_first_ino; /* First non-reserved inode */ 184 185 /*90*/ __le16 s_inode_size; /* Size of an inode */ 186 __le16 s_dat_entry_size; /* Size of a dat entry */ 187 __le16 s_checkpoint_size; /* Size of a checkpoint */ 188 __le16 s_segment_usage_size; /* Size of a segment usage */ 189 190 /*98*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ 191 /*A8*/ char s_volume_name[80] /* volume name */ 192 __kernel_nonstring; 193 194 /*F8*/ __le32 s_c_interval; /* Commit interval of segment */ 195 __le32 s_c_block_max; /* 196 * Threshold of data amount for 197 * the segment construction 198 */ 199 /*100*/ __le64 s_feature_compat; /* Compatible feature set */ 200 __le64 s_feature_compat_ro; /* Read-only compatible feature set */ 201 __le64 s_feature_incompat; /* Incompatible feature set */ 202 __u32 s_reserved[186]; /* padding to the end of the block */ 203 }; 204 205 /* 206 * Codes for operating systems 207 */ 208 #define NILFS_OS_LINUX 0 209 /* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */ 210 211 /* 212 * Revision levels 213 */ 214 #define NILFS_CURRENT_REV 2 /* current major revision */ 215 #define NILFS_MINOR_REV 0 /* minor revision */ 216 #define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */ 217 218 /* 219 * Feature set definitions 220 * 221 * If there is a bit set in the incompatible feature set that the kernel 222 * doesn't know about, it should refuse to mount the filesystem. 223 */ 224 #define NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT 0x00000001ULL 225 226 #define NILFS_FEATURE_COMPAT_SUPP 0ULL 227 #define NILFS_FEATURE_COMPAT_RO_SUPP NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT 228 #define NILFS_FEATURE_INCOMPAT_SUPP 0ULL 229 230 /* 231 * Bytes count of super_block for CRC-calculation 232 */ 233 #define NILFS_SB_BYTES \ 234 ((long)&((struct nilfs_super_block *)0)->s_reserved) 235 236 /* 237 * Special inode number 238 */ 239 #define NILFS_ROOT_INO 2 /* Root file inode */ 240 #define NILFS_DAT_INO 3 /* DAT file */ 241 #define NILFS_CPFILE_INO 4 /* checkpoint file */ 242 #define NILFS_SUFILE_INO 5 /* segment usage file */ 243 #define NILFS_IFILE_INO 6 /* ifile */ 244 #define NILFS_ATIME_INO 7 /* Atime file (reserved) */ 245 #define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */ 246 #define NILFS_SKETCH_INO 10 /* Sketch file */ 247 #define NILFS_USER_INO 11 /* Fisrt user's file inode number */ 248 249 #define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */ 250 251 #define NILFS_SEG_MIN_BLOCKS 16 /* 252 * Minimum number of blocks in 253 * a full segment 254 */ 255 #define NILFS_PSEG_MIN_BLOCKS 2 /* 256 * Minimum number of blocks in 257 * a partial segment 258 */ 259 #define NILFS_MIN_NRSVSEGS 8 /* 260 * Minimum number of reserved 261 * segments 262 */ 263 264 /* 265 * We call DAT, cpfile, and sufile root metadata files. Inodes of 266 * these files are written in super root block instead of ifile, and 267 * garbage collector doesn't keep any past versions of these files. 268 */ 269 #define NILFS_ROOT_METADATA_FILE(ino) \ 270 ((ino) >= NILFS_DAT_INO && (ino) <= NILFS_SUFILE_INO) 271 272 /* 273 * bytes offset of secondary super block 274 */ 275 #define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12) 276 277 /* 278 * Maximal count of links to a file 279 */ 280 #define NILFS_LINK_MAX 32000 281 282 /* 283 * Structure of a directory entry 284 * (Same as ext2) 285 */ 286 287 #define NILFS_NAME_LEN 255 288 289 /* 290 * Block size limitations 291 */ 292 #define NILFS_MIN_BLOCK_SIZE 1024 293 #define NILFS_MAX_BLOCK_SIZE 65536 294 295 /* 296 * The new version of the directory entry. Since V0 structures are 297 * stored in intel byte order, and the name_len field could never be 298 * bigger than 255 chars, it's safe to reclaim the extra byte for the 299 * file_type field. 300 */ 301 struct nilfs_dir_entry { 302 __le64 inode; /* Inode number */ 303 __le16 rec_len; /* Directory entry length */ 304 __u8 name_len; /* Name length */ 305 __u8 file_type; /* Dir entry type (file, dir, etc) */ 306 char name[NILFS_NAME_LEN]; /* File name */ 307 char pad; 308 }; 309 310 /* 311 * NILFS directory file types. Only the low 3 bits are used. The 312 * other bits are reserved for now. 313 */ 314 enum { 315 NILFS_FT_UNKNOWN, 316 NILFS_FT_REG_FILE, 317 NILFS_FT_DIR, 318 NILFS_FT_CHRDEV, 319 NILFS_FT_BLKDEV, 320 NILFS_FT_FIFO, 321 NILFS_FT_SOCK, 322 NILFS_FT_SYMLINK, 323 NILFS_FT_MAX 324 }; 325 326 /* 327 * NILFS_DIR_PAD defines the directory entries boundaries 328 * 329 * NOTE: It must be a multiple of 8 330 */ 331 #define NILFS_DIR_PAD 8 332 #define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1) 333 #define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \ 334 ~NILFS_DIR_ROUND) 335 #define NILFS_MAX_REC_LEN ((1 << 16) - 1) 336 337 /** 338 * struct nilfs_finfo - file information 339 * @fi_ino: inode number 340 * @fi_cno: checkpoint number 341 * @fi_nblocks: number of blocks (including intermediate blocks) 342 * @fi_ndatablk: number of file data blocks 343 */ 344 struct nilfs_finfo { 345 __le64 fi_ino; 346 __le64 fi_cno; 347 __le32 fi_nblocks; 348 __le32 fi_ndatablk; 349 }; 350 351 /** 352 * struct nilfs_binfo_v - information on a data block (except DAT) 353 * @bi_vblocknr: virtual block number 354 * @bi_blkoff: block offset 355 */ 356 struct nilfs_binfo_v { 357 __le64 bi_vblocknr; 358 __le64 bi_blkoff; 359 }; 360 361 /** 362 * struct nilfs_binfo_dat - information on a DAT node block 363 * @bi_blkoff: block offset 364 * @bi_level: level 365 * @bi_pad: padding 366 */ 367 struct nilfs_binfo_dat { 368 __le64 bi_blkoff; 369 __u8 bi_level; 370 __u8 bi_pad[7]; 371 }; 372 373 /** 374 * union nilfs_binfo: block information 375 * @bi_v: nilfs_binfo_v structure 376 * @bi_dat: nilfs_binfo_dat structure 377 */ 378 union nilfs_binfo { 379 struct nilfs_binfo_v bi_v; 380 struct nilfs_binfo_dat bi_dat; 381 }; 382 383 /** 384 * struct nilfs_segment_summary - segment summary header 385 * @ss_datasum: checksum of data 386 * @ss_sumsum: checksum of segment summary 387 * @ss_magic: magic number 388 * @ss_bytes: size of this structure in bytes 389 * @ss_flags: flags 390 * @ss_seq: sequence number 391 * @ss_create: creation timestamp 392 * @ss_next: next segment 393 * @ss_nblocks: number of blocks 394 * @ss_nfinfo: number of finfo structures 395 * @ss_sumbytes: total size of segment summary in bytes 396 * @ss_pad: padding 397 * @ss_cno: checkpoint number 398 */ 399 struct nilfs_segment_summary { 400 __le32 ss_datasum; 401 __le32 ss_sumsum; 402 __le32 ss_magic; 403 __le16 ss_bytes; 404 __le16 ss_flags; 405 __le64 ss_seq; 406 __le64 ss_create; 407 __le64 ss_next; 408 __le32 ss_nblocks; 409 __le32 ss_nfinfo; 410 __le32 ss_sumbytes; 411 __le32 ss_pad; 412 __le64 ss_cno; 413 /* array of finfo structures */ 414 }; 415 416 #define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */ 417 418 /* 419 * Segment summary flags 420 */ 421 #define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */ 422 #define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */ 423 #define NILFS_SS_SR 0x0004 /* has super root */ 424 #define NILFS_SS_SYNDT 0x0008 /* includes data only updates */ 425 #define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */ 426 427 /** 428 * struct nilfs_btree_node - header of B-tree node block 429 * @bn_flags: flags 430 * @bn_level: level 431 * @bn_nchildren: number of children 432 * @bn_pad: padding 433 */ 434 struct nilfs_btree_node { 435 __u8 bn_flags; 436 __u8 bn_level; 437 __le16 bn_nchildren; 438 __le32 bn_pad; 439 }; 440 441 /* flags */ 442 #define NILFS_BTREE_NODE_ROOT 0x01 443 444 /* level */ 445 #define NILFS_BTREE_LEVEL_DATA 0 446 #define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1) 447 #define NILFS_BTREE_LEVEL_MAX 14 /* Max level (exclusive) */ 448 449 /** 450 * struct nilfs_direct_node - header of built-in bmap array 451 * @dn_flags: flags 452 * @dn_pad: padding 453 */ 454 struct nilfs_direct_node { 455 __u8 dn_flags; 456 __u8 pad[7]; 457 }; 458 459 /** 460 * struct nilfs_palloc_group_desc - block group descriptor 461 * @pg_nfrees: number of free entries in block group 462 */ 463 struct nilfs_palloc_group_desc { 464 __le32 pg_nfrees; 465 }; 466 467 /** 468 * struct nilfs_dat_entry - disk address translation entry 469 * @de_blocknr: block number 470 * @de_start: start checkpoint number 471 * @de_end: end checkpoint number 472 * @de_rsv: reserved for future use 473 */ 474 struct nilfs_dat_entry { 475 __le64 de_blocknr; 476 __le64 de_start; 477 __le64 de_end; 478 __le64 de_rsv; 479 }; 480 481 #define NILFS_MIN_DAT_ENTRY_SIZE 32 482 483 /** 484 * struct nilfs_snapshot_list - snapshot list 485 * @ssl_next: next checkpoint number on snapshot list 486 * @ssl_prev: previous checkpoint number on snapshot list 487 */ 488 struct nilfs_snapshot_list { 489 __le64 ssl_next; 490 __le64 ssl_prev; 491 }; 492 493 /** 494 * struct nilfs_checkpoint - checkpoint structure 495 * @cp_flags: flags 496 * @cp_checkpoints_count: checkpoints count in a block 497 * @cp_snapshot_list: snapshot list 498 * @cp_cno: checkpoint number 499 * @cp_create: creation timestamp 500 * @cp_nblk_inc: number of blocks incremented by this checkpoint 501 * @cp_inodes_count: inodes count 502 * @cp_blocks_count: blocks count 503 * @cp_ifile_inode: inode of ifile 504 */ 505 struct nilfs_checkpoint { 506 __le32 cp_flags; 507 __le32 cp_checkpoints_count; 508 struct nilfs_snapshot_list cp_snapshot_list; 509 __le64 cp_cno; 510 __le64 cp_create; 511 __le64 cp_nblk_inc; 512 __le64 cp_inodes_count; 513 __le64 cp_blocks_count; 514 515 /* 516 * Do not change the byte offset of ifile inode. 517 * To keep the compatibility of the disk format, 518 * additional fields should be added behind cp_ifile_inode. 519 */ 520 struct nilfs_inode cp_ifile_inode; 521 }; 522 523 #define NILFS_MIN_CHECKPOINT_SIZE (64 + NILFS_MIN_INODE_SIZE) 524 525 /* checkpoint flags */ 526 enum { 527 NILFS_CHECKPOINT_SNAPSHOT, 528 NILFS_CHECKPOINT_INVALID, 529 NILFS_CHECKPOINT_SKETCH, 530 NILFS_CHECKPOINT_MINOR, 531 }; 532 533 #define NILFS_CHECKPOINT_FNS(flag, name) \ 534 static inline void \ 535 nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \ 536 { \ 537 cp->cp_flags = __cpu_to_le32(__le32_to_cpu(cp->cp_flags) | \ 538 (1UL << NILFS_CHECKPOINT_##flag)); \ 539 } \ 540 static inline void \ 541 nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp) \ 542 { \ 543 cp->cp_flags = __cpu_to_le32(__le32_to_cpu(cp->cp_flags) & \ 544 ~(1UL << NILFS_CHECKPOINT_##flag)); \ 545 } \ 546 static inline int \ 547 nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \ 548 { \ 549 return !!(__le32_to_cpu(cp->cp_flags) & \ 550 (1UL << NILFS_CHECKPOINT_##flag)); \ 551 } 552 553 NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot) 554 NILFS_CHECKPOINT_FNS(INVALID, invalid) 555 NILFS_CHECKPOINT_FNS(MINOR, minor) 556 557 /** 558 * struct nilfs_cpfile_header - checkpoint file header 559 * @ch_ncheckpoints: number of checkpoints 560 * @ch_nsnapshots: number of snapshots 561 * @ch_snapshot_list: snapshot list 562 */ 563 struct nilfs_cpfile_header { 564 __le64 ch_ncheckpoints; 565 __le64 ch_nsnapshots; 566 struct nilfs_snapshot_list ch_snapshot_list; 567 }; 568 569 #define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \ 570 ((sizeof(struct nilfs_cpfile_header) + \ 571 sizeof(struct nilfs_checkpoint) - 1) / \ 572 sizeof(struct nilfs_checkpoint)) 573 574 /** 575 * struct nilfs_segment_usage - segment usage 576 * @su_lastmod: last modified timestamp 577 * @su_nblocks: number of blocks in segment 578 * @su_flags: flags 579 */ 580 struct nilfs_segment_usage { 581 __le64 su_lastmod; 582 __le32 su_nblocks; 583 __le32 su_flags; 584 }; 585 586 #define NILFS_MIN_SEGMENT_USAGE_SIZE 16 587 588 /* segment usage flag */ 589 enum { 590 NILFS_SEGMENT_USAGE_ACTIVE, 591 NILFS_SEGMENT_USAGE_DIRTY, 592 NILFS_SEGMENT_USAGE_ERROR, 593 }; 594 595 #define NILFS_SEGMENT_USAGE_FNS(flag, name) \ 596 static inline void \ 597 nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \ 598 { \ 599 su->su_flags = __cpu_to_le32(__le32_to_cpu(su->su_flags) | \ 600 (1UL << NILFS_SEGMENT_USAGE_##flag));\ 601 } \ 602 static inline void \ 603 nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \ 604 { \ 605 su->su_flags = \ 606 __cpu_to_le32(__le32_to_cpu(su->su_flags) & \ 607 ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \ 608 } \ 609 static inline int \ 610 nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \ 611 { \ 612 return !!(__le32_to_cpu(su->su_flags) & \ 613 (1UL << NILFS_SEGMENT_USAGE_##flag)); \ 614 } 615 616 NILFS_SEGMENT_USAGE_FNS(ACTIVE, active) 617 NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty) 618 NILFS_SEGMENT_USAGE_FNS(ERROR, error) 619 620 static inline void 621 nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su) 622 { 623 su->su_lastmod = __cpu_to_le64(0); 624 su->su_nblocks = __cpu_to_le32(0); 625 su->su_flags = __cpu_to_le32(0); 626 } 627 628 static inline int 629 nilfs_segment_usage_clean(const struct nilfs_segment_usage *su) 630 { 631 return !__le32_to_cpu(su->su_flags); 632 } 633 634 /** 635 * struct nilfs_sufile_header - segment usage file header 636 * @sh_ncleansegs: number of clean segments 637 * @sh_ndirtysegs: number of dirty segments 638 * @sh_last_alloc: last allocated segment number 639 */ 640 struct nilfs_sufile_header { 641 __le64 sh_ncleansegs; 642 __le64 sh_ndirtysegs; 643 __le64 sh_last_alloc; 644 /* ... */ 645 }; 646 647 #define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \ 648 ((sizeof(struct nilfs_sufile_header) + \ 649 sizeof(struct nilfs_segment_usage) - 1) / \ 650 sizeof(struct nilfs_segment_usage)) 651 652 #endif /* _LINUX_NILFS2_ONDISK_H */ 653