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 (seconds)
  71  * @i_mtime: modification time (seconds)
  72  * @i_ctime_nsec: creation time (nano seconds)
  73  * @i_mtime_nsec: modification time (nano seconds)
  74  * @i_uid: user id
  75  * @i_gid: group id
  76  * @i_mode: file mode
  77  * @i_links_count: links count
  78  * @i_flags: file flags
  79  * @i_bmap: block mapping
  80  * @i_xattr: extended attributes
  81  * @i_generation: file generation (for NFS)
  82  * @i_pad:      padding
  83  */
  84 struct nilfs_inode {
  85         __le64  i_blocks;
  86         __le64  i_size;
  87         __le64  i_ctime;
  88         __le64  i_mtime;
  89         __le32  i_ctime_nsec;
  90         __le32  i_mtime_nsec;
  91         __le32  i_uid;
  92         __le32  i_gid;
  93         __le16  i_mode;
  94         __le16  i_links_count;
  95         __le32  i_flags;
  96         __le64  i_bmap[NILFS_INODE_BMAP_SIZE];
  97 #define i_device_code   i_bmap[0]
  98         __le64  i_xattr;
  99         __le32  i_generation;
 100         __le32  i_pad;
 101 };
 102
 103 /**
 104  * struct nilfs_super_root - structure of super root
 105  * @sr_sum: check sum
 106  * @sr_bytes: byte count of the structure
 107  * @sr_flags: flags (reserved)
 108  * @sr_nongc_ctime: write time of the last segment not for cleaner operation
 109  * @sr_dat: DAT file inode
 110  * @sr_cpfile: checkpoint file inode
 111  * @sr_sufile: segment usage file inode
 112  */
 113 struct nilfs_super_root {
 114         __le32 sr_sum;
 115         __le16 sr_bytes;
 116         __le16 sr_flags;
 117         __le64 sr_nongc_ctime;
 118         struct nilfs_inode sr_dat;
 119         struct nilfs_inode sr_cpfile;
 120         struct nilfs_inode sr_sufile;
 121 };
 122
 123 #define NILFS_SR_MDT_OFFSET(inode_size, i)  \
 124         ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \
 125                         (inode_size) * (i))
 126 #define NILFS_SR_DAT_OFFSET(inode_size)     NILFS_SR_MDT_OFFSET(inode_size, 0)
 127 #define NILFS_SR_CPFILE_OFFSET(inode_size)  NILFS_SR_MDT_OFFSET(inode_size, 1)
 128 #define NILFS_SR_SUFILE_OFFSET(inode_size)  NILFS_SR_MDT_OFFSET(inode_size, 2)
 129 #define NILFS_SR_BYTES                  (sizeof(struct nilfs_super_root))
 130
 131 /*
 132  * Maximal mount counts
 133  */
 134 #define NILFS_DFL_MAX_MNT_COUNT         50      /* 50 mounts */
 135
 136 /*
 137  * File system states (sbp->s_state, nilfs->ns_mount_state)
 138  */
 139 #define NILFS_VALID_FS                  0x0001  /* Unmounted cleanly */
 140 #define NILFS_ERROR_FS                  0x0002  /* Errors detected */
 141 #define NILFS_RESIZE_FS                 0x0004  /* Resize required */
 142
 143 /*
 144  * Mount flags (sbi->s_mount_opt)
 145  */
 146 #define NILFS_MOUNT_ERROR_MODE          0x0070  /* Error mode mask */
 147 #define NILFS_MOUNT_ERRORS_CONT         0x0010  /* Continue on errors */
 148 #define NILFS_MOUNT_ERRORS_RO           0x0020  /* Remount fs ro on errors */
 149 #define NILFS_MOUNT_ERRORS_PANIC        0x0040  /* Panic on errors */
 150 #define NILFS_MOUNT_SNAPSHOT            0x0080  /* Snapshot flag */
 151 #define NILFS_MOUNT_BARRIER             0x1000  /* Use block barriers */
 152 #define NILFS_MOUNT_STRICT_ORDER        0x2000  /* Apply strict in-order
 153                                                    semantics also for data */
 154 #define NILFS_MOUNT_NORECOVERY          0x4000  /* Disable write access during
 155                                                    mount-time recovery */
 156
 157
 158 /**
 159  * struct nilfs_super_block - structure of super block on disk
 160  */
 161 struct nilfs_super_block {
 162         __le32  s_rev_level;            /* Revision level */
 163         __le16  s_minor_rev_level;      /* minor revision level */
 164         __le16  s_magic;                /* Magic signature */
 165
 166         __le16  s_bytes;                /* Bytes count of CRC calculation
 167                                            for this structure. s_reserved
 168                                            is excluded. */
 169         __le16  s_flags;                /* flags */
 170         __le32  s_crc_seed;             /* Seed value of CRC calculation */
 171         __le32  s_sum;                  /* Check sum of super block */
 172
 173         __le32  s_log_block_size;       /* Block size represented as follows
 174                                            blocksize =
 175                                                1 << (s_log_block_size + 10) */
 176         __le64  s_nsegments;            /* Number of segments in filesystem */
 177         __le64  s_dev_size;             /* block device size in bytes */
 178         __le64  s_first_data_block;     /* 1st seg disk block number */
 179         __le32  s_blocks_per_segment;   /* number of blocks per full segment */
 180         __le32  s_r_segments_percentage; /* Reserved segments percentage */
 181
 182         __le64  s_last_cno;             /* Last checkpoint number */
 183         __le64  s_last_pseg;            /* disk block addr pseg written last */
 184         __le64  s_last_seq;             /* seq. number of seg written last */
 185         __le64  s_free_blocks_count;    /* Free blocks count */
 186
 187         __le64  s_ctime;                /* Creation time (execution time of
 188                                            newfs) */
 189         __le64  s_mtime;                /* Mount time */
 190         __le64  s_wtime;                /* Write time */
 191         __le16  s_mnt_count;            /* Mount count */
 192         __le16  s_max_mnt_count;        /* Maximal mount count */
 193         __le16  s_state;                /* File system state */
 194         __le16  s_errors;               /* Behaviour when detecting errors */
 195         __le64  s_lastcheck;            /* time of last check */
 196
 197         __le32  s_checkinterval;        /* max. time between checks */
 198         __le32  s_creator_os;           /* OS */
 199         __le16  s_def_resuid;           /* Default uid for reserved blocks */
 200         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 201         __le32  s_first_ino;            /* First non-reserved inode */
 202
 203         __le16  s_inode_size;           /* Size of an inode */
 204         __le16  s_dat_entry_size;       /* Size of a dat entry */
 205         __le16  s_checkpoint_size;      /* Size of a checkpoint */
 206         __le16  s_segment_usage_size;   /* Size of a segment usage */
 207
 208         __u8    s_uuid[16];             /* 128-bit uuid for volume */
 209         char    s_volume_name[16];      /* volume name */
 210         char    s_last_mounted[64];     /* directory where last mounted */
 211
 212         __le32  s_c_interval;           /* Commit interval of segment */
 213         __le32  s_c_block_max;          /* Threshold of data amount for
 214                                            the segment construction */
 215         __u32   s_reserved[192];        /* padding to the end of the block */
 216 };
 217
 218 /*
 219  * Codes for operating systems
 220  */
 221 #define NILFS_OS_LINUX          0
 222 /* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */
 223
 224 /*
 225  * Revision levels
 226  */
 227 #define NILFS_CURRENT_REV       2       /* current major revision */
 228 #define NILFS_MINOR_REV         0       /* minor revision */
 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 #define NILFS_SUPER_MAGIC       0x3434  /* NILFS filesystem  magic number */
 251
 252 #define NILFS_SEG_MIN_BLOCKS    16      /* Minimum number of blocks in
 253                                            a full segment */
 254 #define NILFS_PSEG_MIN_BLOCKS   2       /* Minimum number of blocks in
 255                                            a partial segment */
 256 #define NILFS_MIN_NRSVSEGS      8       /* Minimum number of reserved
 257                                            segments */
 258
 259 /*
 260  * bytes offset of secondary super block
 261  */
 262 #define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12)
 263
 264 /*
 265  * Maximal count of links to a file
 266  */
 267 #define NILFS_LINK_MAX          32000
 268
 269 /*
 270  * Structure of a directory entry
 271  *  (Same as ext2)
 272  */
 273
 274 #define NILFS_NAME_LEN 255
 275
 276 /*
 277  * The new version of the directory entry.  Since V0 structures are
 278  * stored in intel byte order, and the name_len field could never be
 279  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 280  * file_type field.
 281  */
 282 struct nilfs_dir_entry {
 283         __le64  inode;                  /* Inode number */
 284         __le16  rec_len;                /* Directory entry length */
 285         __u8    name_len;               /* Name length */
 286         __u8    file_type;
 287         char    name[NILFS_NAME_LEN];   /* File name */
 288         char    pad;
 289 };
 290
 291 /*
 292  * NILFS directory file types.  Only the low 3 bits are used.  The
 293  * other bits are reserved for now.
 294  */
 295 enum {
 296         NILFS_FT_UNKNOWN,
 297         NILFS_FT_REG_FILE,
 298         NILFS_FT_DIR,
 299         NILFS_FT_CHRDEV,
 300         NILFS_FT_BLKDEV,
 301         NILFS_FT_FIFO,
 302         NILFS_FT_SOCK,
 303         NILFS_FT_SYMLINK,
 304         NILFS_FT_MAX
 305 };
 306
 307 /*
 308  * NILFS_DIR_PAD defines the directory entries boundaries
 309  *
 310  * NOTE: It must be a multiple of 8
 311  */
 312 #define NILFS_DIR_PAD                   8
 313 #define NILFS_DIR_ROUND                 (NILFS_DIR_PAD - 1)
 314 #define NILFS_DIR_REC_LEN(name_len)     (((name_len) + 12 + NILFS_DIR_ROUND) & \
 315                                         ~NILFS_DIR_ROUND)
 316
 317
 318 /**
 319  * struct nilfs_finfo - file information
 320  * @fi_ino: inode number
 321  * @fi_cno: checkpoint number
 322  * @fi_nblocks: number of blocks (including intermediate blocks)
 323  * @fi_ndatablk: number of file data blocks
 324  */
 325 struct nilfs_finfo {
 326         __le64 fi_ino;
 327         __le64 fi_cno;
 328         __le32 fi_nblocks;
 329         __le32 fi_ndatablk;
 330         /* array of virtual block numbers */
 331 };
 332
 333 /**
 334  * struct nilfs_binfo_v - information for the block to which a virtual block number is assigned
 335  * @bi_vblocknr: virtual block number
 336  * @bi_blkoff: block offset
 337  */
 338 struct nilfs_binfo_v {
 339         __le64 bi_vblocknr;
 340         __le64 bi_blkoff;
 341 };
 342
 343 /**
 344  * struct nilfs_binfo_dat - information for the block which belongs to the DAT file
 345  * @bi_blkoff: block offset
 346  * @bi_level: level
 347  * @bi_pad: padding
 348  */
 349 struct nilfs_binfo_dat {
 350         __le64 bi_blkoff;
 351         __u8 bi_level;
 352         __u8 bi_pad[7];
 353 };
 354
 355 /**
 356  * union nilfs_binfo: block information
 357  * @bi_v: nilfs_binfo_v structure
 358  * @bi_dat: nilfs_binfo_dat structure
 359  */
 360 union nilfs_binfo {
 361         struct nilfs_binfo_v bi_v;
 362         struct nilfs_binfo_dat bi_dat;
 363 };
 364
 365 /**
 366  * struct nilfs_segment_summary - segment summary
 367  * @ss_datasum: checksum of data
 368  * @ss_sumsum: checksum of segment summary
 369  * @ss_magic: magic number
 370  * @ss_bytes: size of this structure in bytes
 371  * @ss_flags: flags
 372  * @ss_seq: sequence number
 373  * @ss_create: creation timestamp
 374  * @ss_next: next segment
 375  * @ss_nblocks: number of blocks
 376  * @ss_nfinfo: number of finfo structures
 377  * @ss_sumbytes: total size of segment summary in bytes
 378  * @ss_pad: padding
 379  */
 380 struct nilfs_segment_summary {
 381         __le32 ss_datasum;
 382         __le32 ss_sumsum;
 383         __le32 ss_magic;
 384         __le16 ss_bytes;
 385         __le16 ss_flags;
 386         __le64 ss_seq;
 387         __le64 ss_create;
 388         __le64 ss_next;
 389         __le32 ss_nblocks;
 390         __le32 ss_nfinfo;
 391         __le32 ss_sumbytes;
 392         __le32 ss_pad;
 393         /* array of finfo structures */
 394 };
 395
 396 #define NILFS_SEGSUM_MAGIC      0x1eaffa11  /* segment summary magic number */
 397
 398 /*
 399  * Segment summary flags
 400  */
 401 #define NILFS_SS_LOGBGN 0x0001  /* begins a logical segment */
 402 #define NILFS_SS_LOGEND 0x0002  /* ends a logical segment */
 403 #define NILFS_SS_SR     0x0004  /* has super root */
 404 #define NILFS_SS_SYNDT  0x0008  /* includes data only updates */
 405 #define NILFS_SS_GC     0x0010  /* segment written for cleaner operation */
 406
 407 /**
 408  * struct nilfs_btree_node - B-tree node
 409  * @bn_flags: flags
 410  * @bn_level: level
 411  * @bn_nchildren: number of children
 412  * @bn_pad: padding
 413  */
 414 struct nilfs_btree_node {
 415         __u8 bn_flags;
 416         __u8 bn_level;
 417         __le16 bn_nchildren;
 418         __le32 bn_pad;
 419 };
 420
 421 /* flags */
 422 #define NILFS_BTREE_NODE_ROOT   0x01
 423
 424 /* level */
 425 #define NILFS_BTREE_LEVEL_DATA          0
 426 #define NILFS_BTREE_LEVEL_NODE_MIN      (NILFS_BTREE_LEVEL_DATA + 1)
 427 #define NILFS_BTREE_LEVEL_MAX           14
 428
 429 /**
 430  * struct nilfs_palloc_group_desc - block group descriptor
 431  * @pg_nfrees: number of free entries in block group
 432  */
 433 struct nilfs_palloc_group_desc {
 434         __le32 pg_nfrees;
 435 };
 436
 437 /**
 438  * struct nilfs_dat_entry - disk address translation entry
 439  * @dt_blocknr: block number
 440  * @dt_start: start checkpoint number
 441  * @dt_end: end checkpoint number
 442  * @dt_rsv: reserved for future use
 443  */
 444 struct nilfs_dat_entry {
 445         __le64 de_blocknr;
 446         __le64 de_start;
 447         __le64 de_end;
 448         __le64 de_rsv;
 449 };
 450
 451 /**
 452  * struct nilfs_snapshot_list - snapshot list
 453  * @ssl_next: next checkpoint number on snapshot list
 454  * @ssl_prev: previous checkpoint number on snapshot list
 455  */
 456 struct nilfs_snapshot_list {
 457         __le64 ssl_next;
 458         __le64 ssl_prev;
 459 };
 460
 461 /**
 462  * struct nilfs_checkpoint - checkpoint structure
 463  * @cp_flags: flags
 464  * @cp_checkpoints_count: checkpoints count in a block
 465  * @cp_snapshot_list: snapshot list
 466  * @cp_cno: checkpoint number
 467  * @cp_create: creation timestamp
 468  * @cp_nblk_inc: number of blocks incremented by this checkpoint
 469  * @cp_inodes_count: inodes count
 470  * @cp_blocks_count: blocks count
 471  * @cp_ifile_inode: inode of ifile
 472  */
 473 struct nilfs_checkpoint {
 474         __le32 cp_flags;
 475         __le32 cp_checkpoints_count;
 476         struct nilfs_snapshot_list cp_snapshot_list;
 477         __le64 cp_cno;
 478         __le64 cp_create;
 479         __le64 cp_nblk_inc;
 480         __le64 cp_inodes_count;
 481         __le64 cp_blocks_count;         /* Reserved (might be deleted) */
 482
 483         /* Do not change the byte offset of ifile inode.
 484            To keep the compatibility of the disk format,
 485            additional fields should be added behind cp_ifile_inode. */
 486         struct nilfs_inode cp_ifile_inode;
 487 };
 488
 489 /* checkpoint flags */
 490 enum {
 491         NILFS_CHECKPOINT_SNAPSHOT,
 492         NILFS_CHECKPOINT_INVALID,
 493         NILFS_CHECKPOINT_SKETCH,
 494         NILFS_CHECKPOINT_MINOR,
 495 };
 496
 497 #define NILFS_CHECKPOINT_FNS(flag, name)                                \
 498 static inline void                                                      \
 499 nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp)                \
 500 {                                                                       \
 501         cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) |          \
 502                                    (1UL << NILFS_CHECKPOINT_##flag));   \
 503 }                                                                       \
 504 static inline void                                                      \
 505 nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp)              \
 506 {                                                                       \
 507         cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) &          \
 508                                    ~(1UL << NILFS_CHECKPOINT_##flag));  \
 509 }                                                                       \
 510 static inline int                                                       \
 511 nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp)              \
 512 {                                                                       \
 513         return !!(le32_to_cpu(cp->cp_flags) &                           \
 514                   (1UL << NILFS_CHECKPOINT_##flag));                    \
 515 }
 516
 517 NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot)
 518 NILFS_CHECKPOINT_FNS(INVALID, invalid)
 519 NILFS_CHECKPOINT_FNS(MINOR, minor)
 520
 521 /**
 522  * struct nilfs_cpinfo - checkpoint information
 523  * @ci_flags: flags
 524  * @ci_pad: padding
 525  * @ci_cno: checkpoint number
 526  * @ci_create: creation timestamp
 527  * @ci_nblk_inc: number of blocks incremented by this checkpoint
 528  * @ci_inodes_count: inodes count
 529  * @ci_blocks_count: blocks count
 530  * @ci_next: next checkpoint number in snapshot list
 531  */
 532 struct nilfs_cpinfo {
 533         __u32 ci_flags;
 534         __u32 ci_pad;
 535         __u64 ci_cno;
 536         __u64 ci_create;
 537         __u64 ci_nblk_inc;
 538         __u64 ci_inodes_count;
 539         __u64 ci_blocks_count;
 540         __u64 ci_next;
 541 };
 542
 543 #define NILFS_CPINFO_FNS(flag, name)                                    \
 544 static inline int                                                       \
 545 nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo)                  \
 546 {                                                                       \
 547         return !!(cpinfo->ci_flags & (1UL << NILFS_CHECKPOINT_##flag)); \
 548 }
 549
 550 NILFS_CPINFO_FNS(SNAPSHOT, snapshot)
 551 NILFS_CPINFO_FNS(INVALID, invalid)
 552 NILFS_CPINFO_FNS(MINOR, minor)
 553
 554
 555 /**
 556  * struct nilfs_cpfile_header - checkpoint file header
 557  * @ch_ncheckpoints: number of checkpoints
 558  * @ch_nsnapshots: number of snapshots
 559  * @ch_snapshot_list: snapshot list
 560  */
 561 struct nilfs_cpfile_header {
 562         __le64 ch_ncheckpoints;
 563         __le64 ch_nsnapshots;
 564         struct nilfs_snapshot_list ch_snapshot_list;
 565 };
 566
 567 #define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET    \
 568         ((sizeof(struct nilfs_cpfile_header) +                          \
 569           sizeof(struct nilfs_checkpoint) - 1) /                        \
 570                         sizeof(struct nilfs_checkpoint))
 571
 572 /**
 573  * struct nilfs_segment_usage - segment usage
 574  * @su_lastmod: last modified timestamp
 575  * @su_nblocks: number of blocks in segment
 576  * @su_flags: flags
 577  */
 578 struct nilfs_segment_usage {
 579         __le64 su_lastmod;
 580         __le32 su_nblocks;
 581         __le32 su_flags;
 582 };
 583
 584 /* segment usage flag */
 585 enum {
 586         NILFS_SEGMENT_USAGE_ACTIVE,
 587         NILFS_SEGMENT_USAGE_DIRTY,
 588         NILFS_SEGMENT_USAGE_ERROR,
 589
 590         /* ... */
 591 };
 592
 593 #define NILFS_SEGMENT_USAGE_FNS(flag, name)                             \
 594 static inline void                                                      \
 595 nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su)          \
 596 {                                                                       \
 597         su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) |          \
 598                                    (1UL << NILFS_SEGMENT_USAGE_##flag));\
 599 }                                                                       \
 600 static inline void                                                      \
 601 nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su)        \
 602 {                                                                       \
 603         su->su_flags =                                                  \
 604                 cpu_to_le32(le32_to_cpu(su->su_flags) &                 \
 605                             ~(1UL << NILFS_SEGMENT_USAGE_##flag));      \
 606 }                                                                       \
 607 static inline int                                                       \
 608 nilfs_segment_usage_##name(const struct nilfs_segment_usage *su)        \
 609 {                                                                       \
 610         return !!(le32_to_cpu(su->su_flags) &                           \
 611                   (1UL << NILFS_SEGMENT_USAGE_##flag));                 \
 612 }
 613
 614 NILFS_SEGMENT_USAGE_FNS(ACTIVE, active)
 615 NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty)
 616 NILFS_SEGMENT_USAGE_FNS(ERROR, error)
 617
 618 static inline void
 619 nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su)
 620 {
 621         su->su_lastmod = cpu_to_le64(0);
 622         su->su_nblocks = cpu_to_le32(0);
 623         su->su_flags = cpu_to_le32(0);
 624 }
 625
 626 static inline int
 627 nilfs_segment_usage_clean(const struct nilfs_segment_usage *su)
 628 {
 629         return !le32_to_cpu(su->su_flags);
 630 }
 631
 632 /**
 633  * struct nilfs_sufile_header - segment usage file header
 634  * @sh_ncleansegs: number of clean segments
 635  * @sh_ndirtysegs: number of dirty segments
 636  * @sh_last_alloc: last allocated segment number
 637  */
 638 struct nilfs_sufile_header {
 639         __le64 sh_ncleansegs;
 640         __le64 sh_ndirtysegs;
 641         __le64 sh_last_alloc;
 642         /* ... */
 643 };
 644
 645 #define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \
 646         ((sizeof(struct nilfs_sufile_header) +                          \
 647           sizeof(struct nilfs_segment_usage) - 1) /                     \
 648                          sizeof(struct nilfs_segment_usage))
 649
 650 /**
 651  * nilfs_suinfo - segment usage information
 652  * @sui_lastmod:
 653  * @sui_nblocks:
 654  * @sui_flags:
 655  */
 656 struct nilfs_suinfo {
 657         __u64 sui_lastmod;
 658         __u32 sui_nblocks;
 659         __u32 sui_flags;
 660 };
 661
 662 #define NILFS_SUINFO_FNS(flag, name)                                    \
 663 static inline int                                                       \
 664 nilfs_suinfo_##name(const struct nilfs_suinfo *si)                      \
 665 {                                                                       \
 666         return si->sui_flags & (1UL << NILFS_SEGMENT_USAGE_##flag);     \
 667 }
 668
 669 NILFS_SUINFO_FNS(ACTIVE, active)
 670 NILFS_SUINFO_FNS(DIRTY, dirty)
 671 NILFS_SUINFO_FNS(ERROR, error)
 672
 673 static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
 674 {
 675         return !si->sui_flags;
 676 }
 677
 678 /* ioctl */
 679 enum {
 680         NILFS_CHECKPOINT,
 681         NILFS_SNAPSHOT,
 682 };
 683
 684 /**
 685  * struct nilfs_cpmode -
 686  * @cc_cno:
 687  * @cc_mode:
 688  */
 689 struct nilfs_cpmode {
 690         __u64 cm_cno;
 691         __u32 cm_mode;
 692         __u32 cm_pad;
 693 };
 694
 695 /**
 696  * struct nilfs_argv - argument vector
 697  * @v_base:
 698  * @v_nmembs:
 699  * @v_size:
 700  * @v_flags:
 701  * @v_index:
 702  */
 703 struct nilfs_argv {
 704         __u64 v_base;
 705         __u32 v_nmembs; /* number of members */
 706         __u16 v_size;   /* size of members */
 707         __u16 v_flags;
 708         __u64 v_index;
 709 };
 710
 711 /**
 712  * struct nilfs_period -
 713  * @p_start:
 714  * @p_end:
 715  */
 716 struct nilfs_period {
 717         __u64 p_start;
 718         __u64 p_end;
 719 };
 720
 721 /**
 722  * struct nilfs_cpstat -
 723  * @cs_cno: checkpoint number
 724  * @cs_ncps: number of checkpoints
 725  * @cs_nsss: number of snapshots
 726  */
 727 struct nilfs_cpstat {
 728         __u64 cs_cno;
 729         __u64 cs_ncps;
 730         __u64 cs_nsss;
 731 };
 732
 733 /**
 734  * struct nilfs_sustat -
 735  * @ss_nsegs: number of segments
 736  * @ss_ncleansegs: number of clean segments
 737  * @ss_ndirtysegs: number of dirty segments
 738  * @ss_ctime: creation time of the last segment
 739  * @ss_nongc_ctime: creation time of the last segment not for GC
 740  * @ss_prot_seq: least sequence number of segments which must not be reclaimed
 741  */
 742 struct nilfs_sustat {
 743         __u64 ss_nsegs;
 744         __u64 ss_ncleansegs;
 745         __u64 ss_ndirtysegs;
 746         __u64 ss_ctime;
 747         __u64 ss_nongc_ctime;
 748         __u64 ss_prot_seq;
 749 };
 750
 751 /**
 752  * struct nilfs_vinfo - virtual block number information
 753  * @vi_vblocknr:
 754  * @vi_start:
 755  * @vi_end:
 756  * @vi_blocknr:
 757  */
 758 struct nilfs_vinfo {
 759         __u64 vi_vblocknr;
 760         __u64 vi_start;
 761         __u64 vi_end;
 762         __u64 vi_blocknr;
 763 };
 764
 765 /**
 766  * struct nilfs_vdesc -
 767  */
 768 struct nilfs_vdesc {
 769         __u64 vd_ino;
 770         __u64 vd_cno;
 771         __u64 vd_vblocknr;
 772         struct nilfs_period vd_period;
 773         __u64 vd_blocknr;
 774         __u64 vd_offset;
 775         __u32 vd_flags;
 776         __u32 vd_pad;
 777 };
 778
 779 /**
 780  * struct nilfs_bdesc -
 781  */
 782 struct nilfs_bdesc {
 783         __u64 bd_ino;
 784         __u64 bd_oblocknr;
 785         __u64 bd_blocknr;
 786         __u64 bd_offset;
 787         __u32 bd_level;
 788         __u32 bd_pad;
 789 };
 790
 791 #define NILFS_IOCTL_IDENT               'n'
 792
 793 #define NILFS_IOCTL_CHANGE_CPMODE  \
 794         _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode)
 795 #define NILFS_IOCTL_DELETE_CHECKPOINT  \
 796         _IOW(NILFS_IOCTL_IDENT, 0x81, __u64)
 797 #define NILFS_IOCTL_GET_CPINFO  \
 798         _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv)
 799 #define NILFS_IOCTL_GET_CPSTAT  \
 800         _IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat)
 801 #define NILFS_IOCTL_GET_SUINFO  \
 802         _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv)
 803 #define NILFS_IOCTL_GET_SUSTAT  \
 804         _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat)
 805 #define NILFS_IOCTL_GET_VINFO  \
 806         _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv)
 807 #define NILFS_IOCTL_GET_BDESCS  \
 808         _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
 809 #define NILFS_IOCTL_CLEAN_SEGMENTS  \
 810         _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
 811 #define NILFS_IOCTL_SYNC  \
 812         _IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
 813 #define NILFS_IOCTL_RESIZE  \
 814         _IOW(NILFS_IOCTL_IDENT, 0x8B, __u64)
 815
 816 #endif  /* _LINUX_NILFS_FS_H */