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The C and C++ Include Header Files
cat -n /usr/include/linux/nilfs2_ondisk.h
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 (card@masi.ibp.fr) 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 * @s_rev_level: Revision level 137 * @s_minor_rev_level: minor revision level 138 * @s_magic: Magic signature 139 * @s_bytes: Bytes count of CRC calculation for 140 * this structure. s_reserved is excluded. 141 * @s_flags: flags 142 * @s_crc_seed: Seed value of CRC calculation 143 * @s_sum: Check sum of super block 144 * @s_log_block_size: Block size represented as follows: 145 * blocksize = 1 << (s_log_block_size + 10) 146 * @s_nsegments: Number of segments in filesystem 147 * @s_dev_size: block device size in bytes 148 * @s_first_data_block: 1st seg disk block number 149 * @s_blocks_per_segment: number of blocks per full segment 150 * @s_r_segments_percentage: Reserved segments percentage 151 * @s_last_cno: Last checkpoint number 152 * @s_last_pseg: disk block addr pseg written last 153 * @s_last_seq: seq. number of seg written last 154 * @s_free_blocks_count: Free blocks count 155 * @s_ctime: Creation time (execution time of newfs) 156 * @s_mtime: Mount time 157 * @s_wtime: Write time 158 * @s_mnt_count: Mount count 159 * @s_max_mnt_count: Maximal mount count 160 * @s_state: File system state 161 * @s_errors: Behaviour when detecting errors 162 * @s_lastcheck: time of last check 163 * @s_checkinterval: max. time between checks 164 * @s_creator_os: OS 165 * @s_def_resuid: Default uid for reserved blocks 166 * @s_def_resgid: Default gid for reserved blocks 167 * @s_first_ino: First non-reserved inode 168 * @s_inode_size: Size of an inode 169 * @s_dat_entry_size: Size of a dat entry 170 * @s_checkpoint_size: Size of a checkpoint 171 * @s_segment_usage_size: Size of a segment usage 172 * @s_uuid: 128-bit uuid for volume 173 * @s_volume_name: volume name 174 * @s_c_interval: Commit interval of segment 175 * @s_c_block_max: Threshold of data amount for the 176 * segment construction 177 * @s_feature_compat: Compatible feature set 178 * @s_feature_compat_ro: Read-only compatible feature set 179 * @s_feature_incompat: Incompatible feature set 180 * @s_reserved: padding to the end of the block 181 */ 182 struct nilfs_super_block { 183 /*00*/ __le32 s_rev_level; 184 __le16 s_minor_rev_level; 185 __le16 s_magic; 186 187 __le16 s_bytes; 188 __le16 s_flags; 189 __le32 s_crc_seed; 190 /*10*/ __le32 s_sum; 191 192 __le32 s_log_block_size; 193 __le64 s_nsegments; 194 /*20*/ __le64 s_dev_size; 195 __le64 s_first_data_block; 196 /*30*/ __le32 s_blocks_per_segment; 197 __le32 s_r_segments_percentage; 198 199 __le64 s_last_cno; 200 /*40*/ __le64 s_last_pseg; 201 __le64 s_last_seq; 202 /*50*/ __le64 s_free_blocks_count; 203 204 __le64 s_ctime; 205 /*60*/ __le64 s_mtime; 206 __le64 s_wtime; 207 /*70*/ __le16 s_mnt_count; 208 __le16 s_max_mnt_count; 209 __le16 s_state; 210 __le16 s_errors; 211 __le64 s_lastcheck; 212 213 /*80*/ __le32 s_checkinterval; 214 __le32 s_creator_os; 215 __le16 s_def_resuid; 216 __le16 s_def_resgid; 217 __le32 s_first_ino; 218 219 /*90*/ __le16 s_inode_size; 220 __le16 s_dat_entry_size; 221 __le16 s_checkpoint_size; 222 __le16 s_segment_usage_size; 223 224 /*98*/ __u8 s_uuid[16]; 225 /*A8*/ char s_volume_name[80] __kernel_nonstring; 226 227 /*F8*/ __le32 s_c_interval; 228 __le32 s_c_block_max; 229 230 /*100*/ __le64 s_feature_compat; 231 __le64 s_feature_compat_ro; 232 __le64 s_feature_incompat; 233 __u32 s_reserved[186]; 234 }; 235 236 /* 237 * Codes for operating systems 238 */ 239 #define NILFS_OS_LINUX 0 240 /* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */ 241 242 /* 243 * Revision levels 244 */ 245 #define NILFS_CURRENT_REV 2 /* current major revision */ 246 #define NILFS_MINOR_REV 0 /* minor revision */ 247 #define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */ 248 249 /* 250 * Feature set definitions 251 * 252 * If there is a bit set in the incompatible feature set that the kernel 253 * doesn't know about, it should refuse to mount the filesystem. 254 */ 255 #define NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT 0x00000001ULL 256 257 #define NILFS_FEATURE_COMPAT_SUPP 0ULL 258 #define NILFS_FEATURE_COMPAT_RO_SUPP NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT 259 #define NILFS_FEATURE_INCOMPAT_SUPP 0ULL 260 261 /* 262 * Bytes count of super_block for CRC-calculation 263 */ 264 #define NILFS_SB_BYTES \ 265 ((long)&((struct nilfs_super_block *)0)->s_reserved) 266 267 /* 268 * Special inode number 269 */ 270 #define NILFS_ROOT_INO 2 /* Root file inode */ 271 #define NILFS_DAT_INO 3 /* DAT file */ 272 #define NILFS_CPFILE_INO 4 /* checkpoint file */ 273 #define NILFS_SUFILE_INO 5 /* segment usage file */ 274 #define NILFS_IFILE_INO 6 /* ifile */ 275 #define NILFS_ATIME_INO 7 /* Atime file (reserved) */ 276 #define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */ 277 #define NILFS_SKETCH_INO 10 /* Sketch file */ 278 #define NILFS_USER_INO 11 /* Fisrt user's file inode number */ 279 280 #define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */ 281 282 #define NILFS_SEG_MIN_BLOCKS 16 /* 283 * Minimum number of blocks in 284 * a full segment 285 */ 286 #define NILFS_PSEG_MIN_BLOCKS 2 /* 287 * Minimum number of blocks in 288 * a partial segment 289 */ 290 #define NILFS_MIN_NRSVSEGS 8 /* 291 * Minimum number of reserved 292 * segments 293 */ 294 295 /* 296 * We call DAT, cpfile, and sufile root metadata files. Inodes of 297 * these files are written in super root block instead of ifile, and 298 * garbage collector doesn't keep any past versions of these files. 299 */ 300 #define NILFS_ROOT_METADATA_FILE(ino) \ 301 ((ino) >= NILFS_DAT_INO && (ino) <= NILFS_SUFILE_INO) 302 303 /* 304 * bytes offset of secondary super block 305 */ 306 #define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12) 307 308 /* 309 * Maximal count of links to a file 310 */ 311 #define NILFS_LINK_MAX 32000 312 313 /* 314 * Structure of a directory entry 315 * (Same as ext2) 316 */ 317 318 #define NILFS_NAME_LEN 255 319 320 /* 321 * Block size limitations 322 */ 323 #define NILFS_MIN_BLOCK_SIZE 1024 324 #define NILFS_MAX_BLOCK_SIZE 65536 325 326 /* 327 * The new version of the directory entry. Since V0 structures are 328 * stored in intel byte order, and the name_len field could never be 329 * bigger than 255 chars, it's safe to reclaim the extra byte for the 330 * file_type field. 331 */ 332 struct nilfs_dir_entry { 333 __le64 inode; /* Inode number */ 334 __le16 rec_len; /* Directory entry length */ 335 __u8 name_len; /* Name length */ 336 __u8 file_type; /* Dir entry type (file, dir, etc) */ 337 char name[NILFS_NAME_LEN]; /* File name */ 338 char pad; 339 }; 340 341 /* 342 * NILFS directory file types. Only the low 3 bits are used. The 343 * other bits are reserved for now. 344 */ 345 enum { 346 NILFS_FT_UNKNOWN, 347 NILFS_FT_REG_FILE, 348 NILFS_FT_DIR, 349 NILFS_FT_CHRDEV, 350 NILFS_FT_BLKDEV, 351 NILFS_FT_FIFO, 352 NILFS_FT_SOCK, 353 NILFS_FT_SYMLINK, 354 NILFS_FT_MAX 355 }; 356 357 /* 358 * NILFS_DIR_PAD defines the directory entries boundaries 359 * 360 * NOTE: It must be a multiple of 8 361 */ 362 #define NILFS_DIR_PAD 8 363 #define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1) 364 #define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \ 365 ~NILFS_DIR_ROUND) 366 #define NILFS_MAX_REC_LEN ((1 << 16) - 1) 367 368 /** 369 * struct nilfs_finfo - file information 370 * @fi_ino: inode number 371 * @fi_cno: checkpoint number 372 * @fi_nblocks: number of blocks (including intermediate blocks) 373 * @fi_ndatablk: number of file data blocks 374 */ 375 struct nilfs_finfo { 376 __le64 fi_ino; 377 __le64 fi_cno; 378 __le32 fi_nblocks; 379 __le32 fi_ndatablk; 380 }; 381 382 /** 383 * struct nilfs_binfo_v - information on a data block (except DAT) 384 * @bi_vblocknr: virtual block number 385 * @bi_blkoff: block offset 386 */ 387 struct nilfs_binfo_v { 388 __le64 bi_vblocknr; 389 __le64 bi_blkoff; 390 }; 391 392 /** 393 * struct nilfs_binfo_dat - information on a DAT node block 394 * @bi_blkoff: block offset 395 * @bi_level: level 396 * @bi_pad: padding 397 */ 398 struct nilfs_binfo_dat { 399 __le64 bi_blkoff; 400 __u8 bi_level; 401 __u8 bi_pad[7]; 402 }; 403 404 /** 405 * union nilfs_binfo: block information 406 * @bi_v: nilfs_binfo_v structure 407 * @bi_dat: nilfs_binfo_dat structure 408 */ 409 union nilfs_binfo { 410 struct nilfs_binfo_v bi_v; 411 struct nilfs_binfo_dat bi_dat; 412 }; 413 414 /** 415 * struct nilfs_segment_summary - segment summary header 416 * @ss_datasum: checksum of data 417 * @ss_sumsum: checksum of segment summary 418 * @ss_magic: magic number 419 * @ss_bytes: size of this structure in bytes 420 * @ss_flags: flags 421 * @ss_seq: sequence number 422 * @ss_create: creation timestamp 423 * @ss_next: next segment 424 * @ss_nblocks: number of blocks 425 * @ss_nfinfo: number of finfo structures 426 * @ss_sumbytes: total size of segment summary in bytes 427 * @ss_pad: padding 428 * @ss_cno: checkpoint number 429 */ 430 struct nilfs_segment_summary { 431 __le32 ss_datasum; 432 __le32 ss_sumsum; 433 __le32 ss_magic; 434 __le16 ss_bytes; 435 __le16 ss_flags; 436 __le64 ss_seq; 437 __le64 ss_create; 438 __le64 ss_next; 439 __le32 ss_nblocks; 440 __le32 ss_nfinfo; 441 __le32 ss_sumbytes; 442 __le32 ss_pad; 443 __le64 ss_cno; 444 /* array of finfo structures */ 445 }; 446 447 #define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */ 448 449 /* 450 * Segment summary flags 451 */ 452 #define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */ 453 #define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */ 454 #define NILFS_SS_SR 0x0004 /* has super root */ 455 #define NILFS_SS_SYNDT 0x0008 /* includes data only updates */ 456 #define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */ 457 458 /** 459 * struct nilfs_btree_node - header of B-tree node block 460 * @bn_flags: flags 461 * @bn_level: level 462 * @bn_nchildren: number of children 463 * @bn_pad: padding 464 */ 465 struct nilfs_btree_node { 466 __u8 bn_flags; 467 __u8 bn_level; 468 __le16 bn_nchildren; 469 __le32 bn_pad; 470 }; 471 472 /* flags */ 473 #define NILFS_BTREE_NODE_ROOT 0x01 474 475 /* level */ 476 #define NILFS_BTREE_LEVEL_DATA 0 477 #define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1) 478 #define NILFS_BTREE_LEVEL_MAX 14 /* Max level (exclusive) */ 479 480 /** 481 * struct nilfs_direct_node - header of built-in bmap array 482 * @dn_flags: flags 483 * @pad: padding 484 */ 485 struct nilfs_direct_node { 486 __u8 dn_flags; 487 __u8 pad[7]; 488 }; 489 490 /** 491 * struct nilfs_palloc_group_desc - block group descriptor 492 * @pg_nfrees: number of free entries in block group 493 */ 494 struct nilfs_palloc_group_desc { 495 __le32 pg_nfrees; 496 }; 497 498 /** 499 * struct nilfs_dat_entry - disk address translation entry 500 * @de_blocknr: block number 501 * @de_start: start checkpoint number 502 * @de_end: end checkpoint number 503 * @de_rsv: reserved for future use 504 */ 505 struct nilfs_dat_entry { 506 __le64 de_blocknr; 507 __le64 de_start; 508 __le64 de_end; 509 __le64 de_rsv; 510 }; 511 512 #define NILFS_MIN_DAT_ENTRY_SIZE 32 513 514 /** 515 * struct nilfs_snapshot_list - snapshot list 516 * @ssl_next: next checkpoint number on snapshot list 517 * @ssl_prev: previous checkpoint number on snapshot list 518 */ 519 struct nilfs_snapshot_list { 520 __le64 ssl_next; 521 __le64 ssl_prev; 522 }; 523 524 /** 525 * struct nilfs_checkpoint - checkpoint structure 526 * @cp_flags: flags 527 * @cp_checkpoints_count: checkpoints count in a block 528 * @cp_snapshot_list: snapshot list 529 * @cp_cno: checkpoint number 530 * @cp_create: creation timestamp 531 * @cp_nblk_inc: number of blocks incremented by this checkpoint 532 * @cp_inodes_count: inodes count 533 * @cp_blocks_count: blocks count 534 * @cp_ifile_inode: inode of ifile 535 */ 536 struct nilfs_checkpoint { 537 __le32 cp_flags; 538 __le32 cp_checkpoints_count; 539 struct nilfs_snapshot_list cp_snapshot_list; 540 __le64 cp_cno; 541 __le64 cp_create; 542 __le64 cp_nblk_inc; 543 __le64 cp_inodes_count; 544 __le64 cp_blocks_count; 545 546 /* 547 * Do not change the byte offset of ifile inode. 548 * To keep the compatibility of the disk format, 549 * additional fields should be added behind cp_ifile_inode. 550 */ 551 struct nilfs_inode cp_ifile_inode; 552 }; 553 554 #define NILFS_MIN_CHECKPOINT_SIZE (64 + NILFS_MIN_INODE_SIZE) 555 556 /* checkpoint flags */ 557 enum { 558 NILFS_CHECKPOINT_SNAPSHOT, 559 NILFS_CHECKPOINT_INVALID, 560 NILFS_CHECKPOINT_SKETCH, 561 NILFS_CHECKPOINT_MINOR, 562 }; 563 564 #define NILFS_CHECKPOINT_FNS(flag, name) \ 565 static __inline__ void \ 566 nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \ 567 { \ 568 cp->cp_flags = __cpu_to_le32(__le32_to_cpu(cp->cp_flags) | \ 569 (1UL << NILFS_CHECKPOINT_##flag)); \ 570 } \ 571 static __inline__ void \ 572 nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp) \ 573 { \ 574 cp->cp_flags = __cpu_to_le32(__le32_to_cpu(cp->cp_flags) & \ 575 ~(1UL << NILFS_CHECKPOINT_##flag)); \ 576 } \ 577 static __inline__ int \ 578 nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \ 579 { \ 580 return !!(__le32_to_cpu(cp->cp_flags) & \ 581 (1UL << NILFS_CHECKPOINT_##flag)); \ 582 } 583 584 NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot) 585 NILFS_CHECKPOINT_FNS(INVALID, invalid) 586 NILFS_CHECKPOINT_FNS(MINOR, minor) 587 588 /** 589 * struct nilfs_cpfile_header - checkpoint file header 590 * @ch_ncheckpoints: number of checkpoints 591 * @ch_nsnapshots: number of snapshots 592 * @ch_snapshot_list: snapshot list 593 */ 594 struct nilfs_cpfile_header { 595 __le64 ch_ncheckpoints; 596 __le64 ch_nsnapshots; 597 struct nilfs_snapshot_list ch_snapshot_list; 598 }; 599 600 #define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \ 601 ((sizeof(struct nilfs_cpfile_header) + \ 602 sizeof(struct nilfs_checkpoint) - 1) / \ 603 sizeof(struct nilfs_checkpoint)) 604 605 /** 606 * struct nilfs_segment_usage - segment usage 607 * @su_lastmod: last modified timestamp 608 * @su_nblocks: number of blocks in segment 609 * @su_flags: flags 610 */ 611 struct nilfs_segment_usage { 612 __le64 su_lastmod; 613 __le32 su_nblocks; 614 __le32 su_flags; 615 }; 616 617 #define NILFS_MIN_SEGMENT_USAGE_SIZE 16 618 619 /* segment usage flag */ 620 enum { 621 NILFS_SEGMENT_USAGE_ACTIVE, 622 NILFS_SEGMENT_USAGE_DIRTY, 623 NILFS_SEGMENT_USAGE_ERROR, 624 }; 625 626 #define NILFS_SEGMENT_USAGE_FNS(flag, name) \ 627 static __inline__ void \ 628 nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \ 629 { \ 630 su->su_flags = __cpu_to_le32(__le32_to_cpu(su->su_flags) | \ 631 (1UL << NILFS_SEGMENT_USAGE_##flag));\ 632 } \ 633 static __inline__ void \ 634 nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \ 635 { \ 636 su->su_flags = \ 637 __cpu_to_le32(__le32_to_cpu(su->su_flags) & \ 638 ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \ 639 } \ 640 static __inline__ int \ 641 nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \ 642 { \ 643 return !!(__le32_to_cpu(su->su_flags) & \ 644 (1UL << NILFS_SEGMENT_USAGE_##flag)); \ 645 } 646 647 NILFS_SEGMENT_USAGE_FNS(ACTIVE, active) 648 NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty) 649 NILFS_SEGMENT_USAGE_FNS(ERROR, error) 650 651 static __inline__ void 652 nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su) 653 { 654 su->su_lastmod = __cpu_to_le64(0); 655 su->su_nblocks = __cpu_to_le32(0); 656 su->su_flags = __cpu_to_le32(0); 657 } 658 659 static __inline__ int 660 nilfs_segment_usage_clean(const struct nilfs_segment_usage *su) 661 { 662 return !__le32_to_cpu(su->su_flags); 663 } 664 665 /** 666 * struct nilfs_sufile_header - segment usage file header 667 * @sh_ncleansegs: number of clean segments 668 * @sh_ndirtysegs: number of dirty segments 669 * @sh_last_alloc: last allocated segment number 670 */ 671 struct nilfs_sufile_header { 672 __le64 sh_ncleansegs; 673 __le64 sh_ndirtysegs; 674 __le64 sh_last_alloc; 675 /* ... */ 676 }; 677 678 #define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \ 679 ((sizeof(struct nilfs_sufile_header) + \ 680 sizeof(struct nilfs_segment_usage) - 1) / \ 681 sizeof(struct nilfs_segment_usage)) 682 683 #endif /* _LINUX_NILFS2_ONDISK_H */
