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
 155
 156 /**
 157  * struct nilfs_super_block - structure of super block on disk
 158  */
 159 struct nilfs_super_block {
 160         __le32  s_rev_level;            /* Revision level */
 161         __le16  s_minor_rev_level;      /* minor revision level */
 162         __le16  s_magic;                /* Magic signature */
 163
 164         __le16  s_bytes;                /* Bytes count of CRC calculation
 165                                            for this structure. s_reserved
 166                                            is excluded. */
 167         __le16  s_flags;                /* flags */
 168         __le32  s_crc_seed;             /* Seed value of CRC calculation */
 169         __le32  s_sum;                  /* Check sum of super block */
 170
 171         __le32  s_log_block_size;       /* Block size represented as follows
 172                                            blocksize =
 173                                                1 << (s_log_block_size + 10) */
 174         __le64  s_nsegments;            /* Number of segments in filesystem */
 175         __le64  s_dev_size;             /* block device size in bytes */
 176         __le64  s_first_data_block;     /* 1st seg disk block number */
 177         __le32  s_blocks_per_segment;   /* number of blocks per full segment */
 178         __le32  s_r_segments_percentage; /* Reserved segments percentage */
 179
 180         __le64  s_last_cno;             /* Last checkpoint number */
 181         __le64  s_last_pseg;            /* disk block addr pseg written last */
 182         __le64  s_last_seq;             /* seq. number of seg written last */
 183         __le64  s_free_blocks_count;    /* Free blocks count */
 184
 185         __le64  s_ctime;                /* Creation time (execution time of
 186                                            newfs) */
 187         __le64  s_mtime;                /* Mount time */
 188         __le64  s_wtime;                /* Write time */
 189         __le16  s_mnt_count;            /* Mount count */
 190         __le16  s_max_mnt_count;        /* Maximal mount count */
 191         __le16  s_state;                /* File system state */
 192         __le16  s_errors;               /* Behaviour when detecting errors */
 193         __le64  s_lastcheck;            /* time of last check */
 194
 195         __le32  s_checkinterval;        /* max. time between checks */
 196         __le32  s_creator_os;           /* OS */
 197         __le16  s_def_resuid;           /* Default uid for reserved blocks */
 198         __le16  s_def_resgid;           /* Default gid for reserved blocks */
 199         __le32  s_first_ino;            /* First non-reserved inode */
 200
 201         __le16  s_inode_size;           /* Size of an inode */
 202         __le16  s_dat_entry_size;       /* Size of a dat entry */
 203         __le16  s_checkpoint_size;      /* Size of a checkpoint */
 204         __le16  s_segment_usage_size;   /* Size of a segment usage */
 205
 206         __u8    s_uuid[16];             /* 128-bit uuid for volume */
 207         char    s_volume_name[16];      /* volume name */
 208         char    s_last_mounted[64];     /* directory where last mounted */
 209
 210         __le32  s_c_interval;           /* Commit interval of segment */
 211         __le32  s_c_block_max;          /* Threshold of data amount for
 212                                            the segment construction */
 213         __u32   s_reserved[192];        /* padding to the end of the block */
 214 };
 215
 216 /*
 217  * Codes for operating systems
 218  */
 219 #define NILFS_OS_LINUX          0
 220 /* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */
 221
 222 /*
 223  * Revision levels
 224  */
 225 #define NILFS_CURRENT_REV       2       /* current major revision */
 226 #define NILFS_MINOR_REV         0       /* minor revision */
 227
 228 /*
 229  * Bytes count of super_block for CRC-calculation
 230  */
 231 #define NILFS_SB_BYTES  \
 232         ((long)&((struct nilfs_super_block *)0)->s_reserved)
 233
 234 /*
 235  * Special inode number
 236  */
 237 #define NILFS_ROOT_INO          2       /* Root file inode */
 238 #define NILFS_DAT_INO           3       /* DAT file */
 239 #define NILFS_CPFILE_INO        4       /* checkpoint file */
 240 #define NILFS_SUFILE_INO        5       /* segment usage file */
 241 #define NILFS_IFILE_INO         6       /* ifile */
 242 #define NILFS_ATIME_INO         7       /* Atime file (reserved) */
 243 #define NILFS_XATTR_INO         8       /* Xattribute file (reserved) */
 244 #define NILFS_SKETCH_INO        10      /* Sketch file */
 245 #define NILFS_USER_INO          11      /* Fisrt user's file inode number */
 246
 247 #define NILFS_SB_OFFSET_BYTES   1024    /* byte offset of nilfs superblock */
 248 #define NILFS_SUPER_MAGIC       0x3434  /* NILFS filesystem  magic number */
 249
 250 #define NILFS_SEG_MIN_BLOCKS    16      /* Minimum number of blocks in
 251                                            a full segment */
 252 #define NILFS_PSEG_MIN_BLOCKS   2       /* Minimum number of blocks in
 253                                            a partial segment */
 254 #define NILFS_MIN_NRSVSEGS      8       /* Minimum number of reserved
 255                                            segments */
 256
 257 /*
 258  * bytes offset of secondary super block
 259  */
 260 #define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12)
 261
 262 /*
 263  * Maximal count of links to a file
 264  */
 265 #define NILFS_LINK_MAX          32000
 266
 267 /*
 268  * Structure of a directory entry
 269  *  (Same as ext2)
 270  */
 271
 272 #define NILFS_NAME_LEN 255
 273
 274 /*
 275  * The new version of the directory entry.  Since V0 structures are
 276  * stored in intel byte order, and the name_len field could never be
 277  * bigger than 255 chars, it's safe to reclaim the extra byte for the
 278  * file_type field.
 279  */
 280 struct nilfs_dir_entry {
 281         __le64  inode;                  /* Inode number */
 282         __le16  rec_len;                /* Directory entry length */
 283         __u8    name_len;               /* Name length */
 284         __u8    file_type;
 285         char    name[NILFS_NAME_LEN];   /* File name */
 286         char    pad;
 287 };
 288
 289 /*
 290  * NILFS directory file types.  Only the low 3 bits are used.  The
 291  * other bits are reserved for now.
 292  */
 293 enum {
 294         NILFS_FT_UNKNOWN,
 295         NILFS_FT_REG_FILE,
 296         NILFS_FT_DIR,
 297         NILFS_FT_CHRDEV,
 298         NILFS_FT_BLKDEV,
 299         NILFS_FT_FIFO,
 300         NILFS_FT_SOCK,
 301         NILFS_FT_SYMLINK,
 302         NILFS_FT_MAX
 303 };
 304
 305 /*
 306  * NILFS_DIR_PAD defines the directory entries boundaries
 307  *
 308  * NOTE: It must be a multiple of 8
 309  */
 310 #define NILFS_DIR_PAD                   8
 311 #define NILFS_DIR_ROUND                 (NILFS_DIR_PAD - 1)
 312 #define NILFS_DIR_REC_LEN(name_len)     (((name_len) + 12 + NILFS_DIR_ROUND) & \
 313                                         ~NILFS_DIR_ROUND)
 314
 315
 316 /**
 317  * struct nilfs_finfo - file information
 318  * @fi_ino: inode number
 319  * @fi_cno: checkpoint number
 320  * @fi_nblocks: number of blocks (including intermediate blocks)
 321  * @fi_ndatablk: number of file data blocks
 322  */
 323 struct nilfs_finfo {
 324         __le64 fi_ino;
 325         __le64 fi_cno;
 326         __le32 fi_nblocks;
 327         __le32 fi_ndatablk;
 328         /* array of virtual block numbers */
 329 };
 330
 331 /**
 332  * struct nilfs_binfo_v - information for the block to which a virtual block number is assigned
 333  * @bi_vblocknr: virtual block number
 334  * @bi_blkoff: block offset
 335  */
 336 struct nilfs_binfo_v {
 337         __le64 bi_vblocknr;
 338         __le64 bi_blkoff;
 339 };
 340
 341 /**
 342  * struct nilfs_binfo_dat - information for the block which belongs to the DAT file
 343  * @bi_blkoff: block offset
 344  * @bi_level: level
 345  * @bi_pad: padding
 346  */
 347 struct nilfs_binfo_dat {
 348         __le64 bi_blkoff;
 349         __u8 bi_level;
 350         __u8 bi_pad[7];
 351 };
 352
 353 /**
 354  * union nilfs_binfo: block information
 355  * @bi_v: nilfs_binfo_v structure
 356  * @bi_dat: nilfs_binfo_dat structure
 357  */
 358 union nilfs_binfo {
 359         struct nilfs_binfo_v bi_v;
 360         struct nilfs_binfo_dat bi_dat;
 361 };
 362
 363 /**
 364  * struct nilfs_segment_summary - segment summary
 365  * @ss_datasum: checksum of data
 366  * @ss_sumsum: checksum of segment summary
 367  * @ss_magic: magic number
 368  * @ss_bytes: size of this structure in bytes
 369  * @ss_flags: flags
 370  * @ss_seq: sequence number
 371  * @ss_create: creation timestamp
 372  * @ss_next: next segment
 373  * @ss_nblocks: number of blocks
 374  * @ss_nfinfo: number of finfo structures
 375  * @ss_sumbytes: total size of segment summary in bytes
 376  * @ss_pad: padding
 377  */
 378 struct nilfs_segment_summary {
 379         __le32 ss_datasum;
 380         __le32 ss_sumsum;
 381         __le32 ss_magic;
 382         __le16 ss_bytes;
 383         __le16 ss_flags;
 384         __le64 ss_seq;
 385         __le64 ss_create;
 386         __le64 ss_next;
 387         __le32 ss_nblocks;
 388         __le32 ss_nfinfo;
 389         __le32 ss_sumbytes;
 390         __le32 ss_pad;
 391         /* array of finfo structures */
 392 };
 393
 394 #define NILFS_SEGSUM_MAGIC      0x1eaffa11  /* segment summary magic number */
 395
 396 /*
 397  * Segment summary flags
 398  */
 399 #define NILFS_SS_LOGBGN 0x0001  /* begins a logical segment */
 400 #define NILFS_SS_LOGEND 0x0002  /* ends a logical segment */
 401 #define NILFS_SS_SR     0x0004  /* has super root */
 402 #define NILFS_SS_SYNDT  0x0008  /* includes data only updates */
 403 #define NILFS_SS_GC     0x0010  /* segment written for cleaner operation */
 404
 405 /**
 406  * struct nilfs_palloc_group_desc - block group descriptor
 407  * @pg_nfrees: number of free entries in block group
 408  */
 409 struct nilfs_palloc_group_desc {
 410         __le32 pg_nfrees;
 411 };
 412
 413 /**
 414  * struct nilfs_dat_entry - disk address translation entry
 415  * @dt_blocknr: block number
 416  * @dt_start: start checkpoint number
 417  * @dt_end: end checkpoint number
 418  * @dt_rsv: reserved for future use
 419  */
 420 struct nilfs_dat_entry {
 421         __le64 de_blocknr;
 422         __le64 de_start;
 423         __le64 de_end;
 424         __le64 de_rsv;
 425 };
 426
 427 /**
 428  * struct nilfs_dat_group_desc - block group descriptor
 429  * @dg_nfrees: number of free virtual block numbers in block group
 430  */
 431 struct nilfs_dat_group_desc {
 432         __le32 dg_nfrees;
 433 };
 434
 435
 436 /**
 437  * struct nilfs_snapshot_list - snapshot list
 438  * @ssl_next: next checkpoint number on snapshot list
 439  * @ssl_prev: previous checkpoint number on snapshot list
 440  */
 441 struct nilfs_snapshot_list {
 442         __le64 ssl_next;
 443         __le64 ssl_prev;
 444 };
 445
 446 /**
 447  * struct nilfs_checkpoint - checkpoint structure
 448  * @cp_flags: flags
 449  * @cp_checkpoints_count: checkpoints count in a block
 450  * @cp_snapshot_list: snapshot list
 451  * @cp_cno: checkpoint number
 452  * @cp_create: creation timestamp
 453  * @cp_nblk_inc: number of blocks incremented by this checkpoint
 454  * @cp_inodes_count: inodes count
 455  * @cp_blocks_count: blocks count
 456  * @cp_ifile_inode: inode of ifile
 457  */
 458 struct nilfs_checkpoint {
 459         __le32 cp_flags;
 460         __le32 cp_checkpoints_count;
 461         struct nilfs_snapshot_list cp_snapshot_list;
 462         __le64 cp_cno;
 463         __le64 cp_create;
 464         __le64 cp_nblk_inc;
 465         __le64 cp_inodes_count;
 466         __le64 cp_blocks_count;         /* Reserved (might be deleted) */
 467
 468         /* Do not change the byte offset of ifile inode.
 469            To keep the compatibility of the disk format,
 470            additional fields should be added behind cp_ifile_inode. */
 471         struct nilfs_inode cp_ifile_inode;
 472 };
 473
 474 /* checkpoint flags */
 475 enum {
 476         NILFS_CHECKPOINT_SNAPSHOT,
 477         NILFS_CHECKPOINT_INVALID,
 478         NILFS_CHECKPOINT_SKETCH,
 479         NILFS_CHECKPOINT_MINOR,
 480 };
 481
 482 #define NILFS_CHECKPOINT_FNS(flag, name)                                \
 483 static inline void                                                      \
 484 nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp)                \
 485 {                                                                       \
 486         cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) |          \
 487                                    (1UL << NILFS_CHECKPOINT_##flag));   \
 488 }                                                                       \
 489 static inline void                                                      \
 490 nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp)              \
 491 {                                                                       \
 492         cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) &          \
 493                                    ~(1UL << NILFS_CHECKPOINT_##flag));  \
 494 }                                                                       \
 495 static inline int                                                       \
 496 nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp)              \
 497 {                                                                       \
 498         return !!(le32_to_cpu(cp->cp_flags) &                           \
 499                   (1UL << NILFS_CHECKPOINT_##flag));                    \
 500 }
 501
 502 NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot)
 503 NILFS_CHECKPOINT_FNS(INVALID, invalid)
 504 NILFS_CHECKPOINT_FNS(MINOR, minor)
 505
 506 /**
 507  * struct nilfs_cpinfo - checkpoint information
 508  * @ci_flags: flags
 509  * @ci_pad: padding
 510  * @ci_cno: checkpoint number
 511  * @ci_create: creation timestamp
 512  * @ci_nblk_inc: number of blocks incremented by this checkpoint
 513  * @ci_inodes_count: inodes count
 514  * @ci_blocks_count: blocks count
 515  * @ci_next: next checkpoint number in snapshot list
 516  */
 517 struct nilfs_cpinfo {
 518         __u32 ci_flags;
 519         __u32 ci_pad;
 520         __u64 ci_cno;
 521         __u64 ci_create;
 522         __u64 ci_nblk_inc;
 523         __u64 ci_inodes_count;
 524         __u64 ci_blocks_count;
 525         __u64 ci_next;
 526 };
 527
 528 #define NILFS_CPINFO_FNS(flag, name)                                    \
 529 static inline int                                                       \
 530 nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo)                  \
 531 {                                                                       \
 532         return !!(cpinfo->ci_flags & (1UL << NILFS_CHECKPOINT_##flag)); \
 533 }
 534
 535 NILFS_CPINFO_FNS(SNAPSHOT, snapshot)
 536 NILFS_CPINFO_FNS(INVALID, invalid)
 537 NILFS_CPINFO_FNS(MINOR, minor)
 538
 539
 540 /**
 541  * struct nilfs_cpfile_header - checkpoint file header
 542  * @ch_ncheckpoints: number of checkpoints
 543  * @ch_nsnapshots: number of snapshots
 544  * @ch_snapshot_list: snapshot list
 545  */
 546 struct nilfs_cpfile_header {
 547         __le64 ch_ncheckpoints;
 548         __le64 ch_nsnapshots;
 549         struct nilfs_snapshot_list ch_snapshot_list;
 550 };
 551
 552 #define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET    \
 553         ((sizeof(struct nilfs_cpfile_header) +                          \
 554           sizeof(struct nilfs_checkpoint) - 1) /                        \
 555                         sizeof(struct nilfs_checkpoint))
 556
 557 /**
 558  * struct nilfs_segment_usage - segment usage
 559  * @su_lastmod: last modified timestamp
 560  * @su_nblocks: number of blocks in segment
 561  * @su_flags: flags
 562  */
 563 struct nilfs_segment_usage {
 564         __le64 su_lastmod;
 565         __le32 su_nblocks;
 566         __le32 su_flags;
 567 };
 568
 569 /* segment usage flag */
 570 enum {
 571         NILFS_SEGMENT_USAGE_ACTIVE,
 572         NILFS_SEGMENT_USAGE_DIRTY,
 573         NILFS_SEGMENT_USAGE_ERROR,
 574
 575         /* ... */
 576 };
 577
 578 #define NILFS_SEGMENT_USAGE_FNS(flag, name)                             \
 579 static inline void                                                      \
 580 nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su)          \
 581 {                                                                       \
 582         su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) |          \
 583                                    (1UL << NILFS_SEGMENT_USAGE_##flag));\
 584 }                                                                       \
 585 static inline void                                                      \
 586 nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su)        \
 587 {                                                                       \
 588         su->su_flags =                                                  \
 589                 cpu_to_le32(le32_to_cpu(su->su_flags) &                 \
 590                             ~(1UL << NILFS_SEGMENT_USAGE_##flag));      \
 591 }                                                                       \
 592 static inline int                                                       \
 593 nilfs_segment_usage_##name(const struct nilfs_segment_usage *su)        \
 594 {                                                                       \
 595         return !!(le32_to_cpu(su->su_flags) &                           \
 596                   (1UL << NILFS_SEGMENT_USAGE_##flag));                 \
 597 }
 598
 599 NILFS_SEGMENT_USAGE_FNS(ACTIVE, active)
 600 NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty)
 601 NILFS_SEGMENT_USAGE_FNS(ERROR, error)
 602
 603 static inline void
 604 nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su)
 605 {
 606         su->su_lastmod = cpu_to_le64(0);
 607         su->su_nblocks = cpu_to_le32(0);
 608         su->su_flags = cpu_to_le32(0);
 609 }
 610
 611 static inline int
 612 nilfs_segment_usage_clean(const struct nilfs_segment_usage *su)
 613 {
 614         return !le32_to_cpu(su->su_flags);
 615 }
 616
 617 /**
 618  * struct nilfs_sufile_header - segment usage file header
 619  * @sh_ncleansegs: number of clean segments
 620  * @sh_ndirtysegs: number of dirty segments
 621  * @sh_last_alloc: last allocated segment number
 622  */
 623 struct nilfs_sufile_header {
 624         __le64 sh_ncleansegs;
 625         __le64 sh_ndirtysegs;
 626         __le64 sh_last_alloc;
 627         /* ... */
 628 };
 629
 630 #define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \
 631         ((sizeof(struct nilfs_sufile_header) +                          \
 632           sizeof(struct nilfs_segment_usage) - 1) /                     \
 633                          sizeof(struct nilfs_segment_usage))
 634
 635 /**
 636  * nilfs_suinfo - segment usage information
 637  * @sui_lastmod:
 638  * @sui_nblocks:
 639  * @sui_flags:
 640  */
 641 struct nilfs_suinfo {
 642         __u64 sui_lastmod;
 643         __u32 sui_nblocks;
 644         __u32 sui_flags;
 645 };
 646
 647 #define NILFS_SUINFO_FNS(flag, name)                                    \
 648 static inline int                                                       \
 649 nilfs_suinfo_##name(const struct nilfs_suinfo *si)                      \
 650 {                                                                       \
 651         return si->sui_flags & (1UL << NILFS_SEGMENT_USAGE_##flag);     \
 652 }
 653
 654 NILFS_SUINFO_FNS(ACTIVE, active)
 655 NILFS_SUINFO_FNS(DIRTY, dirty)
 656 NILFS_SUINFO_FNS(ERROR, error)
 657
 658 static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
 659 {
 660         return !si->sui_flags;
 661 }
 662
 663 /* ioctl */
 664 enum {
 665         NILFS_CHECKPOINT,
 666         NILFS_SNAPSHOT,
 667 };
 668
 669 /**
 670  * struct nilfs_cpmode -
 671  * @cc_cno:
 672  * @cc_mode:
 673  */
 674 struct nilfs_cpmode {
 675         __u64 cm_cno;
 676         __u32 cm_mode;
 677         __u32 cm_pad;
 678 };
 679
 680 /**
 681  * struct nilfs_argv - argument vector
 682  * @v_base:
 683  * @v_nmembs:
 684  * @v_size:
 685  * @v_flags:
 686  * @v_index:
 687  */
 688 struct nilfs_argv {
 689         __u64 v_base;
 690         __u32 v_nmembs; /* number of members */
 691         __u16 v_size;   /* size of members */
 692         __u16 v_flags;
 693         __u64 v_index;
 694 };
 695
 696 /**
 697  * struct nilfs_period -
 698  * @p_start:
 699  * @p_end:
 700  */
 701 struct nilfs_period {
 702         __u64 p_start;
 703         __u64 p_end;
 704 };
 705
 706 /**
 707  * struct nilfs_cpstat -
 708  * @cs_cno: checkpoint number
 709  * @cs_ncps: number of checkpoints
 710  * @cs_nsss: number of snapshots
 711  */
 712 struct nilfs_cpstat {
 713         __u64 cs_cno;
 714         __u64 cs_ncps;
 715         __u64 cs_nsss;
 716 };
 717
 718 /**
 719  * struct nilfs_sustat -
 720  * @ss_nsegs: number of segments
 721  * @ss_ncleansegs: number of clean segments
 722  * @ss_ndirtysegs: number of dirty segments
 723  * @ss_ctime: creation time of the last segment
 724  * @ss_nongc_ctime: creation time of the last segment not for GC
 725  * @ss_prot_seq: least sequence number of segments which must not be reclaimed
 726  */
 727 struct nilfs_sustat {
 728         __u64 ss_nsegs;
 729         __u64 ss_ncleansegs;
 730         __u64 ss_ndirtysegs;
 731         __u64 ss_ctime;
 732         __u64 ss_nongc_ctime;
 733         __u64 ss_prot_seq;
 734 };
 735
 736 /**
 737  * struct nilfs_vinfo - virtual block number information
 738  * @vi_vblocknr:
 739  * @vi_start:
 740  * @vi_end:
 741  * @vi_blocknr:
 742  */
 743 struct nilfs_vinfo {
 744         __u64 vi_vblocknr;
 745         __u64 vi_start;
 746         __u64 vi_end;
 747         __u64 vi_blocknr;
 748 };
 749
 750 /**
 751  * struct nilfs_vdesc -
 752  */
 753 struct nilfs_vdesc {
 754         __u64 vd_ino;
 755         __u64 vd_cno;
 756         __u64 vd_vblocknr;
 757         struct nilfs_period vd_period;
 758         __u64 vd_blocknr;
 759         __u64 vd_offset;
 760         __u32 vd_flags;
 761         __u32 vd_pad;
 762 };
 763
 764 /**
 765  * struct nilfs_bdesc -
 766  */
 767 struct nilfs_bdesc {
 768         __u64 bd_ino;
 769         __u64 bd_oblocknr;
 770         __u64 bd_blocknr;
 771         __u64 bd_offset;
 772         __u32 bd_level;
 773         __u32 bd_pad;
 774 };
 775
 776 #define NILFS_IOCTL_IDENT               'n'
 777
 778 #define NILFS_IOCTL_CHANGE_CPMODE  \
 779         _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode)
 780 #define NILFS_IOCTL_DELETE_CHECKPOINT  \
 781         _IOW(NILFS_IOCTL_IDENT, 0x81, __u64)
 782 #define NILFS_IOCTL_GET_CPINFO  \
 783         _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv)
 784 #define NILFS_IOCTL_GET_CPSTAT  \
 785         _IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat)
 786 #define NILFS_IOCTL_GET_SUINFO  \
 787         _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv)
 788 #define NILFS_IOCTL_GET_SUSTAT  \
 789         _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat)
 790 #define NILFS_IOCTL_GET_VINFO  \
 791         _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv)
 792 #define NILFS_IOCTL_GET_BDESCS  \
 793         _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
 794 #define NILFS_IOCTL_CLEAN_SEGMENTS  \
 795         _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
 796 #define NILFS_IOCTL_SYNC  \
 797         _IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
 798 #define NILFS_IOCTL_RESIZE  \
 799         _IOW(NILFS_IOCTL_IDENT, 0x8B, __u64)
 800
 801 #endif  /* _LINUX_NILFS_FS_H */