include/linux/nilfs2_fs.h

   1 /*
   2  * nilfs2_fs.h - NILFS2 on-disk structures and common declarations.
   3  *
   4  * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  * Written by Koji Sato <koji@osrg.net>
  21  *            Ryusuke Konishi <ryusuke@osrg.net>
  22  */
  23 /*
  24  *  linux/include/linux/ext2_fs.h
  25  *
  26  * Copyright (C) 1992, 1993, 1994, 1995
  27  * Remy Card (card@masi.ibp.fr)
  28  * Laboratoire MASI - Institut Blaise Pascal
  29  * Universite Pierre et Marie Curie (Paris VI)
  30  *
  31  *  from
  32  *
  33  *  linux/include/linux/minix_fs.h
  34  *
  35  *  Copyright (C) 1991, 1992  Linus Torvalds
  36  */
  37
  38 #ifndef _LINUX_NILFS_FS_H
  39 #define _LINUX_NILFS_FS_H
  40
  41 #include <linux/types.h>
  42 #include <linux/ioctl.h>
  43
  44 /*
  45  * Inode flags stored in nilfs_inode and on-memory nilfs inode
  46  *
  47  * We define these flags based on ext2-fs because of the
  48  * compatibility reason; to avoid problems in chattr(1)
  49  */
  50 #define NILFS_SECRM_FL          0x00000001 /* Secure deletion */
  51 #define NILFS_UNRM_FL           0x00000002 /* Undelete */
  52 #define NILFS_SYNC_FL           0x00000008 /* Synchronous updates */
  53 #define NILFS_IMMUTABLE_FL      0x00000010 /* Immutable file */
  54 #define NILFS_APPEND_FL         0x00000020 /* writes to file may only append */
  55 #define NILFS_NODUMP_FL         0x00000040 /* do not dump file */
  56 #define NILFS_NOATIME_FL        0x00000080 /* do not update atime */
  57 /* Reserved for compression usage... */
  58 #define NILFS_NOTAIL_FL         0x00008000 /* file tail should not be merged */
  59 #define NILFS_DIRSYNC_FL        0x00010000 /* dirsync behaviour */
  60
  61 #define NILFS_FL_USER_VISIBLE   0x0003DFFF /* User visible flags */
  62 #define NILFS_FL_USER_MODIFIABLE        0x000380FF /* User modifiable flags */
  63
  64
  65 #define NILFS_INODE_BMAP_SIZE   7
  66 /**
  67  * struct nilfs_inode - structure of an inode on disk
  68  * @i_blocks: blocks count
  69  * @i_size: size in bytes
  70  * @i_ctime: creation time
  71  * @i_mtime: modification time
  72  * @i_dtime: deletion time
  73  * @i_uid: user id
  74  * @i_gid: group id
  75  * @i_mode: file mode
  76  * @i_links_count: links count
  77  * @i_flags: file flags
  78  * @i_bmap: block mapping
  79  * @i_xattr: extended attributes
  80  * @i_generation: file generation (for NFS)
  81  * @i_pad:      padding
  82  */
  83 struct nilfs_inode {
  84         __le64  i_blocks;
  85         __le64  i_size;
  86         __le64  i_ctime;
  87         __le64  i_mtime;
  88         __le64  i_dtime;
  89         __le32  i_uid;
  90         __le32  i_gid;
  91         __le16  i_mode;
  92         __le16  i_links_count;
  93         __le32  i_flags;
  94         __le64  i_bmap[NILFS_INODE_BMAP_SIZE];
  95 #define i_device_code   i_bmap[0]
  96         __le64  i_xattr;
  97         __le32  i_generation;
  98         __le32  i_pad;
  99 };
 100
 101 /**
 102  * struct nilfs_super_root - structure of super root
 103  * @sr_sum: check sum
 104  * @sr_bytes: byte count of the structure
 105  * @sr_flags: flags (reserved)
 106  * @sr_nongc_ctime: write time of the last segment not for cleaner operation
 107  * @sr_dat: DAT file inode
 108  * @sr_cpfile: checkpoint file inode
 109  * @sr_sufile: segment usage file inode
 110  */
 111 struct nilfs_super_root {
 112         __le32 sr_sum;
 113         __le16 sr_bytes;
 114         __le16 sr_flags;
 115         __le64 sr_nongc_ctime;
 116         struct nilfs_inode sr_dat;
 117         struct nilfs_inode sr_cpfile;
 118         struct nilfs_inode sr_sufile;
 119 };
 120
 121 #define NILFS_SR_MDT_OFFSET(inode_size, i)  \
 122         ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \
 123                         (inode_size) * (i))
 124 #define NILFS_SR_DAT_OFFSET(inode_size)     NILFS_SR_MDT_OFFSET(inode_size, 0)
 125 #define NILFS_SR_CPFILE_OFFSET(inode_size)  NILFS_SR_MDT_OFFSET(inode_size, 1)
 126 #define NILFS_SR_SUFILE_OFFSET(inode_size)  NILFS_SR_MDT_OFFSET(inode_size, 2)
 127 #define NILFS_SR_BYTES                  (sizeof(struct nilfs_super_root))
 128
 129 /*
 130  * Maximal mount counts
 131  */
 132 #define NILFS_DFL_MAX_MNT_COUNT         50      /* 50 mounts */
 133
 134 /*
 135  * File system states (sbp->s_state, nilfs->ns_mount_state)
 136  */
 137 #define NILFS_VALID_FS                  0x0001  /* Unmounted cleanly */
 138 #define NILFS_ERROR_FS                  0x0002  /* Errors detected */
 139 #define NILFS_RESIZE_FS                 0x0004  /* Resize required */
 140
 141 /*
 142  * Mount flags (sbi->s_mount_opt)
 143  */
 144 #define NILFS_MOUNT_ERROR_MODE          0x0070  /* Error mode mask */
 145 #define NILFS_MOUNT_ERRORS_CONT         0x0010  /* Continue on errors */
 146 #define NILFS_MOUNT_ERRORS_RO           0x0020  /* Remount fs ro on errors */
 147 #define NILFS_MOUNT_ERRORS_PANIC        0x0040  /* Panic on errors */
 148 #define NILFS_MOUNT_SNAPSHOT            0x0080  /* Snapshot flag */
 149 #define NILFS_MOUNT_BARRIER             0x1000  /* Use block barriers */
 150 #define NILFS_MOUNT_STRICT_ORDER        0x2000  /* Apply strict in-order
 151                                                    semantics also for data */
 152
 153
 154 /**
 155  * struct nilfs_super_block - structure of super block on disk
 156  */
 157 struct nilfs_super_block {
 158         __le32  s_rev_level;            /* Revision level */
 159         __le16  s_minor_rev_level;      /* minor revision level */
 160         __le16  s_magic;                /* Magic signature */
 161
 162         __le16  s_bytes;                /* Bytes count of CRC calculation
 163                                            for this structure. s_reserved
 164                                            is excluded. */
 165         __le16  s_flags;                /* flags */
 166         __le32  s_crc_seed;             /* Seed value of CRC calculation */
 167         __le32  s_sum;                  /* Check sum of super block */
 168
 169         __le32  s_log_block_size;       /* Block size represented as follows
 170                                            blocksize =
 171                                                1 << (s_log_block_size + 10) */
 172         __le64  s_nsegments;            /* Number of segments in filesystem */
 173         __le64  s_dev_size;             /* block device size in bytes */
 174         __le64  s_first_data_block;     /* 1st seg disk block number */
 175         __le32  s_blocks_per_segment;   /* number of blocks per full segment */
 176         __le32  s_r_segments_percentage; /* Reserved segments percentage */
 177
 178         __le64  s_last_cno;             /* Last checkpoint number */
 179         __le64  s_last_pseg;            /* disk block addr pseg written last */
 180         __le64  s_last_seq;             /* seq. number of seg written last */
 181         __le64  s_free_blocks_count;    /* Free blocks count */
 182
 183         __le64  s_ctime;                /* Creation time (execution time of
 184                                            newfs) */
 185         __le64  s_mtime;                /* Mount time */
 186         __le64  s_wtime;                /* Write time */
 187         __le16  s_mnt_count;            /* Mount count */
 188         __le16  s_max_mnt_count;        /* Maximal mount count */
 189         __le16  s_state;                /* File system state */
 190         __le16  s_errors;               /* Behaviour when detecting errors */
 191         __le64  s_lastcheck;            /* time of last check */
 192
 193         __le32  s_checkinterval;        /* max. time between checks */
 194         __le32  s_creator_os;           /* OS */
 195         __le16  s_def_resuid;           /* Default uid for reserved blocks */
 196         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 197         __le32  s_first_ino;            /* First non-reserved inode */
 198
 199         __le16  s_inode_size;           /* Size of an inode */
 200         __le16  s_dat_entry_size;       /* Size of a dat entry */
 201         __le16  s_checkpoint_size;      /* Size of a checkpoint */
 202         __le16  s_segment_usage_size;   /* Size of a segment usage */
 203
 204         __u8    s_uuid[16];             /* 128-bit uuid for volume */
 205         char    s_volume_name[16];      /* volume name */
 206         char    s_last_mounted[64];     /* directory where last mounted */
 207
 208         __le32  s_c_interval;           /* Commit interval of segment */
 209         __le32  s_c_block_max;          /* Threshold of data amount for
 210                                            the segment construction */
 211         __u32   s_reserved[192];        /* padding to the end of the block */
 212 };
 213
 214 /*
 215  * Codes for operating systems
 216  */
 217 #define NILFS_OS_LINUX          0
 218 /* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */
 219
 220 /*
 221  * Revision levels
 222  */
 223 #define NILFS_CURRENT_REV       2       /* current major revision */
 224 #define NILFS_MINOR_REV         0       /* minor revision */
 225
 226 /*
 227  * Bytes count of super_block for CRC-calculation
 228  */
 229 #define NILFS_SB_BYTES  \
 230         ((long)&((struct nilfs_super_block *)0)->s_reserved)
 231
 232 /*
 233  * Special inode number
 234  */
 235 #define NILFS_ROOT_INO          2       /* Root file inode */
 236 #define NILFS_DAT_INO           3       /* DAT file */
 237 #define NILFS_CPFILE_INO        4       /* checkpoint file */
 238 #define NILFS_SUFILE_INO        5       /* segment usage file */
 239 #define NILFS_IFILE_INO         6       /* ifile */
 240 #define NILFS_ATIME_INO         7       /* Atime file (reserved) */
 241 #define NILFS_XATTR_INO         8       /* Xattribute file (reserved) */
 242 #define NILFS_SKETCH_INO        10      /* Sketch file */
 243 #define NILFS_USER_INO          11      /* Fisrt user's file inode number */
 244
 245 #define NILFS_SB_OFFSET_BYTES   1024    /* byte offset of nilfs superblock */
 246 #define NILFS_SUPER_MAGIC       0x3434  /* NILFS filesystem  magic number */
 247
 248 #define NILFS_SEG_MIN_BLOCKS    16      /* Minimum number of blocks in
 249                                            a full segment */
 250 #define NILFS_PSEG_MIN_BLOCKS   2       /* Minimum number of blocks in
 251                                            a partial segment */
 252 #define NILFS_MIN_NRSVSEGS      8       /* Minimum number of reserved
 253                                            segments */
 254
 255
 256 /*
 257  * Maximal count of links to a file
 258  */
 259 #define NILFS_LINK_MAX          32000
 260
 261 /*
 262  * Structure of a directory entry
 263  *  (Same as ext2)
 264  */
 265
 266 #define NILFS_NAME_LEN 255
 267
 268 /*
 269  * The new version of the directory entry.  Since V0 structures are
 270  * stored in intel byte order, and the name_len field could never be
 271  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 272  * file_type field.
 273  */
 274 struct nilfs_dir_entry {
 275         __le64  inode;                  /* Inode number */
 276         __le16  rec_len;                /* Directory entry length */
 277         __u8    name_len;               /* Name length */
 278         __u8    file_type;
 279         char    name[NILFS_NAME_LEN];   /* File name */
 280         char    pad;
 281 };
 282
 283 /*
 284  * NILFS directory file types.  Only the low 3 bits are used.  The
 285  * other bits are reserved for now.
 286  */
 287 enum {
 288         NILFS_FT_UNKNOWN,
 289         NILFS_FT_REG_FILE,
 290         NILFS_FT_DIR,
 291         NILFS_FT_CHRDEV,
 292         NILFS_FT_BLKDEV,
 293         NILFS_FT_FIFO,
 294         NILFS_FT_SOCK,
 295         NILFS_FT_SYMLINK,
 296         NILFS_FT_MAX
 297 };
 298
 299 /*
 300  * NILFS_DIR_PAD defines the directory entries boundaries
 301  *
 302  * NOTE: It must be a multiple of 8
 303  */
 304 #define NILFS_DIR_PAD                   8
 305 #define NILFS_DIR_ROUND                 (NILFS_DIR_PAD - 1)
 306 #define NILFS_DIR_REC_LEN(name_len)     (((name_len) + 12 + NILFS_DIR_ROUND) & \
 307                                         ~NILFS_DIR_ROUND)
 308
 309
 310 /**
 311  * struct nilfs_finfo - file information
 312  * @fi_ino: inode number
 313  * @fi_cno: checkpoint number
 314  * @fi_nblocks: number of blocks (including intermediate blocks)
 315  * @fi_ndatablk: number of file data blocks
 316  */
 317 struct nilfs_finfo {
 318         __le64 fi_ino;
 319         __le64 fi_cno;
 320         __le32 fi_nblocks;
 321         __le32 fi_ndatablk;
 322         /* array of virtual block numbers */
 323 };
 324
 325 /**
 326  * struct nilfs_binfo_v - information for the block to which a virtual block number is assigned
 327  * @bi_vblocknr: virtual block number
 328  * @bi_blkoff: block offset
 329  */
 330 struct nilfs_binfo_v {
 331         __le64 bi_vblocknr;
 332         __le64 bi_blkoff;
 333 };
 334
 335 /**
 336  * struct nilfs_binfo_dat - information for the block which belongs to the DAT file
 337  * @bi_blkoff: block offset
 338  * @bi_level: level
 339  * @bi_pad: padding
 340  */
 341 struct nilfs_binfo_dat {
 342         __le64 bi_blkoff;
 343         __u8 bi_level;
 344         __u8 bi_pad[7];
 345 };
 346
 347 /**
 348  * union nilfs_binfo: block information
 349  * @bi_v: nilfs_binfo_v structure
 350  * @bi_dat: nilfs_binfo_dat structure
 351  */
 352 union nilfs_binfo {
 353         struct nilfs_binfo_v bi_v;
 354         struct nilfs_binfo_dat bi_dat;
 355 };
 356
 357 /**
 358  * struct nilfs_segment_summary - segment summary
 359  * @ss_datasum: checksum of data
 360  * @ss_sumsum: checksum of segment summary
 361  * @ss_magic: magic number
 362  * @ss_bytes: size of this structure in bytes
 363  * @ss_flags: flags
 364  * @ss_seq: sequence number
 365  * @ss_create: creation timestamp
 366  * @ss_next: next segment
 367  * @ss_nblocks: number of blocks
 368  * @ss_nfinfo: number of finfo structures
 369  * @ss_sumbytes: total size of segment summary in bytes
 370  * @ss_pad: padding
 371  */
 372 struct nilfs_segment_summary {
 373         __le32 ss_datasum;
 374         __le32 ss_sumsum;
 375         __le32 ss_magic;
 376         __le16 ss_bytes;
 377         __le16 ss_flags;
 378         __le64 ss_seq;
 379         __le64 ss_create;
 380         __le64 ss_next;
 381         __le32 ss_nblocks;
 382         __le32 ss_nfinfo;
 383         __le32 ss_sumbytes;
 384         __le32 ss_pad;
 385         /* array of finfo structures */
 386 };
 387
 388 #define NILFS_SEGSUM_MAGIC      0x1eaffa11  /* segment summary magic number */
 389
 390 /*
 391  * Segment summary flags
 392  */
 393 #define NILFS_SS_LOGBGN 0x0001  /* begins a logical segment */
 394 #define NILFS_SS_LOGEND 0x0002  /* ends a logical segment */
 395 #define NILFS_SS_SR     0x0004  /* has super root */
 396 #define NILFS_SS_SYNDT  0x0008  /* includes data only updates */
 397 #define NILFS_SS_GC     0x0010  /* segment written for cleaner operation */
 398
 399 /**
 400  * struct nilfs_palloc_group_desc - block group descriptor
 401  * @pg_nfrees: number of free entries in block group
 402  */
 403 struct nilfs_palloc_group_desc {
 404         __le32 pg_nfrees;
 405 };
 406
 407 /**
 408  * struct nilfs_dat_entry - disk address translation entry
 409  * @dt_blocknr: block number
 410  * @dt_start: start checkpoint number
 411  * @dt_end: end checkpoint number
 412  * @dt_rsv: reserved for future use
 413  */
 414 struct nilfs_dat_entry {
 415         __le64 de_blocknr;
 416         __le64 de_start;
 417         __le64 de_end;
 418         __le64 de_rsv;
 419 };
 420
 421 /**
 422  * struct nilfs_dat_group_desc - block group descriptor
 423  * @dg_nfrees: number of free virtual block numbers in block group
 424  */
 425 struct nilfs_dat_group_desc {
 426         __le32 dg_nfrees;
 427 };
 428
 429
 430 /**
 431  * struct nilfs_snapshot_list - snapshot list
 432  * @ssl_next: next checkpoint number on snapshot list
 433  * @ssl_prev: previous checkpoint number on snapshot list
 434  */
 435 struct nilfs_snapshot_list {
 436         __le64 ssl_next;
 437         __le64 ssl_prev;
 438 };
 439
 440 /**
 441  * struct nilfs_checkpoint - checkpoint structure
 442  * @cp_flags: flags
 443  * @cp_checkpoints_count: checkpoints count in a block
 444  * @cp_snapshot_list: snapshot list
 445  * @cp_cno: checkpoint number
 446  * @cp_create: creation timestamp
 447  * @cp_nblk_inc: number of blocks incremented by this checkpoint
 448  * @cp_inodes_count: inodes count
 449  * @cp_blocks_count: blocks count
 450  * @cp_ifile_inode: inode of ifile
 451  */
 452 struct nilfs_checkpoint {
 453         __le32 cp_flags;
 454         __le32 cp_checkpoints_count;
 455         struct nilfs_snapshot_list cp_snapshot_list;
 456         __le64 cp_cno;
 457         __le64 cp_create;
 458         __le64 cp_nblk_inc;
 459         __le64 cp_inodes_count;
 460         __le64 cp_blocks_count;         /* Reserved (might be deleted) */
 461
 462         /* Do not change the byte offset of ifile inode.
 463            To keep the compatibility of the disk format,
 464            additional fields should be added behind cp_ifile_inode. */
 465         struct nilfs_inode cp_ifile_inode;
 466 };
 467
 468 /* checkpoint flags */
 469 enum {
 470         NILFS_CHECKPOINT_SNAPSHOT,
 471         NILFS_CHECKPOINT_INVALID,
 472         NILFS_CHECKPOINT_SKETCH,
 473 };
 474
 475 #define NILFS_CHECKPOINT_FNS(flag, name)                                \
 476 static inline void                                                      \
 477 nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp)                \
 478 {                                                                       \
 479         cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) |          \
 480                                    (1UL << NILFS_CHECKPOINT_##flag));   \
 481 }                                                                       \
 482 static inline void                                                      \
 483 nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp)              \
 484 {                                                                       \
 485         cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) &          \
 486                                    ~(1UL << NILFS_CHECKPOINT_##flag));  \
 487 }                                                                       \
 488 static inline int                                                       \
 489 nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp)              \
 490 {                                                                       \
 491         return !!(le32_to_cpu(cp->cp_flags) &                           \
 492                   (1UL << NILFS_CHECKPOINT_##flag));                    \
 493 }
 494
 495 NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot)
 496 NILFS_CHECKPOINT_FNS(INVALID, invalid)
 497 NILFS_CHECKPOINT_FNS(SKETCH, sketch)
 498
 499 /**
 500  * struct nilfs_cpinfo - checkpoint information
 501  * @ci_flags: flags
 502  * @ci_pad: padding
 503  * @ci_cno: checkpoint number
 504  * @ci_create: creation timestamp
 505  * @ci_nblk_inc: number of blocks incremented by this checkpoint
 506  * @ci_inodes_count: inodes count
 507  * @ci_blocks_count: blocks count
 508  * @ci_next: next checkpoint number in snapshot list
 509  */
 510 struct nilfs_cpinfo {
 511         __u32 ci_flags;
 512         __u32 ci_pad;
 513         __u64 ci_cno;
 514         __u64 ci_create;
 515         __u64 ci_nblk_inc;
 516         __u64 ci_inodes_count;
 517         __u64 ci_blocks_count;
 518         __u64 ci_next;
 519 };
 520
 521 #define NILFS_CPINFO_FNS(flag, name)                                    \
 522 static inline int                                                       \
 523 nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo)                  \
 524 {                                                                       \
 525         return !!(cpinfo->ci_flags & (1UL << NILFS_CHECKPOINT_##flag)); \
 526 }
 527
 528 NILFS_CPINFO_FNS(SNAPSHOT, snapshot)
 529 NILFS_CPINFO_FNS(INVALID, invalid)
 530 NILFS_CPINFO_FNS(SKETCH, sketch)
 531
 532
 533 /**
 534  * struct nilfs_cpfile_header - checkpoint file header
 535  * @ch_ncheckpoints: number of checkpoints
 536  * @ch_nsnapshots: number of snapshots
 537  * @ch_snapshot_list: snapshot list
 538  */
 539 struct nilfs_cpfile_header {
 540         __le64 ch_ncheckpoints;
 541         __le64 ch_nsnapshots;
 542         struct nilfs_snapshot_list ch_snapshot_list;
 543 };
 544
 545 #define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET    \
 546         ((sizeof(struct nilfs_cpfile_header) +                          \
 547           sizeof(struct nilfs_checkpoint) - 1) /                        \
 548                         sizeof(struct nilfs_checkpoint))
 549
 550 /**
 551  * struct nilfs_segment_usage - segment usage
 552  * @su_lastmod: last modified timestamp
 553  * @su_nblocks: number of blocks in segment
 554  * @su_flags: flags
 555  */
 556 struct nilfs_segment_usage {
 557         __le64 su_lastmod;
 558         __le32 su_nblocks;
 559         __le32 su_flags;
 560 };
 561
 562 /* segment usage flag */
 563 enum {
 564         NILFS_SEGMENT_USAGE_ACTIVE,
 565         NILFS_SEGMENT_USAGE_DIRTY,
 566         NILFS_SEGMENT_USAGE_ERROR,
 567
 568         /* ... */
 569 };
 570
 571 #define NILFS_SEGMENT_USAGE_FNS(flag, name)                             \
 572 static inline void                                                      \
 573 nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su)          \
 574 {                                                                       \
 575         su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) |          \
 576                                    (1UL << NILFS_SEGMENT_USAGE_##flag));\
 577 }                                                                       \
 578 static inline void                                                      \
 579 nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su)        \
 580 {                                                                       \
 581         su->su_flags =                                                  \
 582                 cpu_to_le32(le32_to_cpu(su->su_flags) &                 \
 583                             ~(1UL << NILFS_SEGMENT_USAGE_##flag));      \
 584 }                                                                       \
 585 static inline int                                                       \
 586 nilfs_segment_usage_##name(const struct nilfs_segment_usage *su)        \
 587 {                                                                       \
 588         return !!(le32_to_cpu(su->su_flags) &                           \
 589                   (1UL << NILFS_SEGMENT_USAGE_##flag));                 \
 590 }
 591
 592 NILFS_SEGMENT_USAGE_FNS(ACTIVE, active)
 593 NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty)
 594 NILFS_SEGMENT_USAGE_FNS(ERROR, error)
 595
 596 static inline void
 597 nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su)
 598 {
 599         su->su_lastmod = cpu_to_le64(0);
 600         su->su_nblocks = cpu_to_le32(0);
 601         su->su_flags = cpu_to_le32(0);
 602 }
 603
 604 static inline int
 605 nilfs_segment_usage_clean(const struct nilfs_segment_usage *su)
 606 {
 607         return !le32_to_cpu(su->su_flags);
 608 }
 609
 610 /**
 611  * struct nilfs_sufile_header - segment usage file header
 612  * @sh_ncleansegs: number of clean segments
 613  * @sh_ndirtysegs: number of dirty segments
 614  * @sh_last_alloc: last allocated segment number
 615  */
 616 struct nilfs_sufile_header {
 617         __le64 sh_ncleansegs;
 618         __le64 sh_ndirtysegs;
 619         __le64 sh_last_alloc;
 620         /* ... */
 621 };
 622
 623 #define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \
 624         ((sizeof(struct nilfs_sufile_header) +                          \
 625           sizeof(struct nilfs_segment_usage) - 1) /                     \
 626                          sizeof(struct nilfs_segment_usage))
 627
 628 /**
 629  * nilfs_suinfo - segment usage information
 630  * @sui_lastmod:
 631  * @sui_nblocks:
 632  * @sui_flags:
 633  */
 634 struct nilfs_suinfo {
 635         __u64 sui_lastmod;
 636         __u32 sui_nblocks;
 637         __u32 sui_flags;
 638 };
 639
 640 #define NILFS_SUINFO_FNS(flag, name)                                    \
 641 static inline int                                                       \
 642 nilfs_suinfo_##name(const struct nilfs_suinfo *si)                      \
 643 {                                                                       \
 644         return si->sui_flags & (1UL << NILFS_SEGMENT_USAGE_##flag);     \
 645 }
 646
 647 NILFS_SUINFO_FNS(ACTIVE, active)
 648 NILFS_SUINFO_FNS(DIRTY, dirty)
 649 NILFS_SUINFO_FNS(ERROR, error)
 650
 651 static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
 652 {
 653         return !si->sui_flags;
 654 }
 655
 656 /* ioctl */
 657 enum {
 658         NILFS_CHECKPOINT,
 659         NILFS_SNAPSHOT,
 660 };
 661
 662 /**
 663  * struct nilfs_cpmode -
 664  * @cc_cno:
 665  * @cc_mode:
 666  */
 667 struct nilfs_cpmode {
 668         __u64 cm_cno;
 669         __u32 cm_mode;
 670         __u32 cm_pad;
 671 };
 672
 673 /**
 674  * struct nilfs_argv - argument vector
 675  * @v_base:
 676  * @v_nmembs:
 677  * @v_size:
 678  * @v_flags:
 679  * @v_index:
 680  */
 681 struct nilfs_argv {
 682         __u64 v_base;
 683         __u32 v_nmembs; /* number of members */
 684         __u16 v_size;   /* size of members */
 685         __u16 v_flags;
 686         __u64 v_index;
 687 };
 688
 689 /**
 690  * struct nilfs_period -
 691  * @p_start:
 692  * @p_end:
 693  */
 694 struct nilfs_period {
 695         __u64 p_start;
 696         __u64 p_end;
 697 };
 698
 699 /**
 700  * struct nilfs_cpstat -
 701  * @cs_cno: checkpoint number
 702  * @cs_ncps: number of checkpoints
 703  * @cs_nsss: number of snapshots
 704  */
 705 struct nilfs_cpstat {
 706         __u64 cs_cno;
 707         __u64 cs_ncps;
 708         __u64 cs_nsss;
 709 };
 710
 711 /**
 712  * struct nilfs_sustat -
 713  * @ss_nsegs: number of segments
 714  * @ss_ncleansegs: number of clean segments
 715  * @ss_ndirtysegs: number of dirty segments
 716  * @ss_ctime: creation time of the last segment
 717  * @ss_nongc_ctime: creation time of the last segment not for GC
 718  * @ss_prot_seq: least sequence number of segments which must not be reclaimed
 719  */
 720 struct nilfs_sustat {
 721         __u64 ss_nsegs;
 722         __u64 ss_ncleansegs;
 723         __u64 ss_ndirtysegs;
 724         __u64 ss_ctime;
 725         __u64 ss_nongc_ctime;
 726         __u64 ss_prot_seq;
 727 };
 728
 729 /**
 730  * struct nilfs_vinfo - virtual block number information
 731  * @vi_vblocknr:
 732  * @vi_start:
 733  * @vi_end:
 734  * @vi_blocknr:
 735  */
 736 struct nilfs_vinfo {
 737         __u64 vi_vblocknr;
 738         __u64 vi_start;
 739         __u64 vi_end;
 740         __u64 vi_blocknr;
 741 };
 742
 743 /**
 744  * struct nilfs_vdesc -
 745  */
 746 struct nilfs_vdesc {
 747         __u64 vd_ino;
 748         __u64 vd_cno;
 749         __u64 vd_vblocknr;
 750         struct nilfs_period vd_period;
 751         __u64 vd_blocknr;
 752         __u64 vd_offset;
 753         __u32 vd_flags;
 754         __u32 vd_pad;
 755 };
 756
 757 /**
 758  * struct nilfs_bdesc -
 759  */
 760 struct nilfs_bdesc {
 761         __u64 bd_ino;
 762         __u64 bd_oblocknr;
 763         __u64 bd_blocknr;
 764         __u64 bd_offset;
 765         __u32 bd_level;
 766         __u32 bd_pad;
 767 };
 768
 769 #define NILFS_IOCTL_IDENT               'n'
 770
 771 #define NILFS_IOCTL_CHANGE_CPMODE  \
 772         _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode)
 773 #define NILFS_IOCTL_DELETE_CHECKPOINT  \
 774         _IOW(NILFS_IOCTL_IDENT, 0x81, __u64)
 775 #define NILFS_IOCTL_GET_CPINFO  \
 776         _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv)
 777 #define NILFS_IOCTL_GET_CPSTAT  \
 778         _IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat)
 779 #define NILFS_IOCTL_GET_SUINFO  \
 780         _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv)
 781 #define NILFS_IOCTL_GET_SUSTAT  \
 782         _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat)
 783 #define NILFS_IOCTL_GET_VINFO  \
 784         _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv)
 785 #define NILFS_IOCTL_GET_BDESCS  \
 786         _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
 787 #define NILFS_IOCTL_CLEAN_SEGMENTS  \
 788         _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
 789 #define NILFS_IOCTL_SYNC  \
 790         _IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
 791 #define NILFS_IOCTL_RESIZE  \
 792         _IOW(NILFS_IOCTL_IDENT, 0x8B, __u64)
 793
 794 #endif  /* _LINUX_NILFS_FS_H */