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