fs/ceph/ceph_fs.h

   1 /*
   2  * ceph_fs.h - Ceph constants and data types to share between kernel and
   3  * user space.
   4  *
   5  * Most types in this file are defined as little-endian, and are
   6  * primarily intended to describe data structures that pass over the
   7  * wire or that are stored on disk.
   8  *
   9  * LGPL2
  10  */
  11
  12 #ifndef _FS_CEPH_CEPH_FS_H
  13 #define _FS_CEPH_CEPH_FS_H
  14
  15 #include "msgr.h"
  16 #include "rados.h"
  17
  18 /*
  19  * Ceph release version
  20  */
  21 #define CEPH_VERSION_MAJOR 0
  22 #define CEPH_VERSION_MINOR 16
  23 #define CEPH_VERSION_PATCH 1
  24
  25 #define _CEPH_STRINGIFY(x) #x
  26 #define CEPH_STRINGIFY(x) _CEPH_STRINGIFY(x)
  27 #define CEPH_MAKE_VERSION(x, y, z) CEPH_STRINGIFY(x) "." CEPH_STRINGIFY(y) \
  28         "." CEPH_STRINGIFY(z)
  29 #define CEPH_VERSION CEPH_MAKE_VERSION(CEPH_VERSION_MAJOR, \
  30                                        CEPH_VERSION_MINOR, CEPH_VERSION_PATCH)
  31
  32 /*
  33  * subprotocol versions.  when specific messages types or high-level
  34  * protocols change, bump the affected components.  we keep rev
  35  * internal cluster protocols separately from the public,
  36  * client-facing protocol.
  37  */
  38 #define CEPH_OSD_PROTOCOL     7 /* cluster internal */
  39 #define CEPH_MDS_PROTOCOL     9 /* cluster internal */
  40 #define CEPH_MON_PROTOCOL     4 /* cluster internal */
  41 #define CEPH_OSDC_PROTOCOL   20 /* server/client */
  42 #define CEPH_MDSC_PROTOCOL   29 /* server/client */
  43 #define CEPH_MONC_PROTOCOL   14 /* server/client */
  44
  45
  46 #define CEPH_INO_ROOT  1
  47
  48 /* arbitrary limit on max # of monitors (cluster of 3 is typical) */
  49 #define CEPH_MAX_MON   31
  50
  51
  52 unsigned int ceph_full_name_hash(const char *name, unsigned int len);
  53
  54
  55 /*
  56  * ceph_file_layout - describe data layout for a file/inode
  57  */
  58 struct ceph_file_layout {
  59         /* file -> object mapping */
  60         __le32 fl_stripe_unit;     /* stripe unit, in bytes.  must be multiple
  61                                       of page size. */
  62         __le32 fl_stripe_count;    /* over this many objects */
  63         __le32 fl_object_size;     /* until objects are this big, then move to
  64                                       new objects */
  65         __le32 fl_cas_hash;        /* 0 = none; 1 = sha256 */
  66
  67         /* pg -> disk layout */
  68         __le32 fl_object_stripe_unit;  /* for per-object parity, if any */
  69
  70         /* object -> pg layout */
  71         __le32 fl_pg_preferred; /* preferred primary for pg (-1 for none) */
  72         __le32 fl_pg_pool;      /* namespace, crush ruleset, rep level */
  73 } __attribute__ ((packed));
  74
  75
  76
  77
  78 /*********************************************
  79  * message layer
  80  */
  81
  82 /*
  83  * message types
  84  */
  85
  86 /* misc */
  87 #define CEPH_MSG_SHUTDOWN               1
  88 #define CEPH_MSG_PING                   2
  89
  90 /* client <-> monitor */
  91 #define CEPH_MSG_MON_MAP                4
  92 #define CEPH_MSG_MON_GET_MAP            5
  93 #define CEPH_MSG_CLIENT_MOUNT           10
  94 #define CEPH_MSG_CLIENT_MOUNT_ACK       11
  95 #define CEPH_MSG_STATFS                 13
  96 #define CEPH_MSG_STATFS_REPLY           14
  97 #define CEPH_MSG_MON_SUBSCRIBE          15
  98 #define CEPH_MSG_MON_SUBSCRIBE_ACK      16
  99
 100 /* client <-> mds */
 101 #define CEPH_MSG_MDS_GETMAP             20
 102 #define CEPH_MSG_MDS_MAP                21
 103
 104 #define CEPH_MSG_CLIENT_SESSION         22
 105 #define CEPH_MSG_CLIENT_RECONNECT       23
 106
 107 #define CEPH_MSG_CLIENT_REQUEST         24
 108 #define CEPH_MSG_CLIENT_REQUEST_FORWARD 25
 109 #define CEPH_MSG_CLIENT_REPLY           26
 110 #define CEPH_MSG_CLIENT_CAPS            0x310
 111 #define CEPH_MSG_CLIENT_LEASE           0x311
 112 #define CEPH_MSG_CLIENT_SNAP            0x312
 113 #define CEPH_MSG_CLIENT_CAPRELEASE      0x313
 114
 115 /* osd */
 116 #define CEPH_MSG_OSD_GETMAP       40
 117 #define CEPH_MSG_OSD_MAP          41
 118 #define CEPH_MSG_OSD_OP           42
 119 #define CEPH_MSG_OSD_OPREPLY      43
 120
 121
 122 struct ceph_mon_statfs {
 123         __le64 have_version;
 124         struct ceph_fsid fsid;
 125         __le64 tid;
 126 } __attribute__ ((packed));
 127
 128 struct ceph_statfs {
 129         __le64 kb, kb_used, kb_avail;
 130         __le64 num_objects;
 131 } __attribute__ ((packed));
 132
 133 struct ceph_mon_statfs_reply {
 134         struct ceph_fsid fsid;
 135         __le64 tid;
 136         __le64 version;
 137         struct ceph_statfs st;
 138 } __attribute__ ((packed));
 139
 140 struct ceph_osd_getmap {
 141         __le64 have_version;
 142         struct ceph_fsid fsid;
 143         __le32 start;
 144 } __attribute__ ((packed));
 145
 146 struct ceph_mds_getmap {
 147         __le64 have_version;
 148         struct ceph_fsid fsid;
 149 } __attribute__ ((packed));
 150
 151 struct ceph_client_mount {
 152         __le64 have_version;
 153 } __attribute__ ((packed));
 154
 155 struct ceph_mon_subscribe_item {
 156         __le64 have;
 157         __u8 onetime;
 158 } __attribute__ ((packed));
 159
 160 /*
 161  * mds states
 162  *   > 0 -> in
 163  *  <= 0 -> out
 164  */
 165 #define CEPH_MDS_STATE_DNE          0  /* down, does not exist. */
 166 #define CEPH_MDS_STATE_STOPPED     -1  /* down, once existed, but no subtrees.
 167                                           empty log. */
 168 #define CEPH_MDS_STATE_BOOT        -4  /* up, boot announcement. */
 169 #define CEPH_MDS_STATE_STANDBY     -5  /* up, idle.  waiting for assignment. */
 170 #define CEPH_MDS_STATE_CREATING    -6  /* up, creating MDS instance. */
 171 #define CEPH_MDS_STATE_STARTING    -7  /* up, starting previously stopped mds */
 172 #define CEPH_MDS_STATE_STANDBY_REPLAY -8 /* up, tailing active node's journal */
 173
 174 #define CEPH_MDS_STATE_REPLAY       8  /* up, replaying journal. */
 175 #define CEPH_MDS_STATE_RESOLVE      9  /* up, disambiguating distributed
 176                                           operations (import, rename, etc.) */
 177 #define CEPH_MDS_STATE_RECONNECT    10 /* up, reconnect to clients */
 178 #define CEPH_MDS_STATE_REJOIN       11 /* up, rejoining distributed cache */
 179 #define CEPH_MDS_STATE_CLIENTREPLAY 12 /* up, replaying client operations */
 180 #define CEPH_MDS_STATE_ACTIVE       13 /* up, active */
 181 #define CEPH_MDS_STATE_STOPPING     14 /* up, but exporting metadata */
 182
 183 extern const char *ceph_mds_state_name(int s);
 184
 185
 186 /*
 187  * metadata lock types.
 188  *  - these are bitmasks.. we can compose them
 189  *  - they also define the lock ordering by the MDS
 190  *  - a few of these are internal to the mds
 191  */
 192 #define CEPH_LOCK_DN          1
 193 #define CEPH_LOCK_ISNAP       2
 194 #define CEPH_LOCK_IVERSION    4     /* mds internal */
 195 #define CEPH_LOCK_IFILE       8     /* mds internal */
 196 #define CEPH_LOCK_IAUTH       32
 197 #define CEPH_LOCK_ILINK       64
 198 #define CEPH_LOCK_IDFT        128   /* dir frag tree */
 199 #define CEPH_LOCK_INEST       256   /* mds internal */
 200 #define CEPH_LOCK_IXATTR      512
 201 #define CEPH_LOCK_INO         2048  /* immutable inode bits; not a lock */
 202
 203 /* client_session ops */
 204 enum {
 205         CEPH_SESSION_REQUEST_OPEN,
 206         CEPH_SESSION_OPEN,
 207         CEPH_SESSION_REQUEST_CLOSE,
 208         CEPH_SESSION_CLOSE,
 209         CEPH_SESSION_REQUEST_RENEWCAPS,
 210         CEPH_SESSION_RENEWCAPS,
 211         CEPH_SESSION_STALE,
 212         CEPH_SESSION_RECALL_STATE,
 213 };
 214
 215 extern const char *ceph_session_op_name(int op);
 216
 217 struct ceph_mds_session_head {
 218         __le32 op;
 219         __le64 seq;
 220         struct ceph_timespec stamp;
 221         __le32 max_caps, max_leases;
 222 } __attribute__ ((packed));
 223
 224 /* client_request */
 225 /*
 226  * metadata ops.
 227  *  & 0x001000 -> write op
 228  *  & 0x010000 -> follow symlink (e.g. stat(), not lstat()).
 229  &  & 0x100000 -> use weird ino/path trace
 230  */
 231 #define CEPH_MDS_OP_WRITE        0x001000
 232 enum {
 233         CEPH_MDS_OP_LOOKUP     = 0x00100,
 234         CEPH_MDS_OP_GETATTR    = 0x00101,
 235         CEPH_MDS_OP_LOOKUPHASH = 0x00102,
 236         CEPH_MDS_OP_LOOKUPPARENT = 0x00103,
 237
 238         CEPH_MDS_OP_SETXATTR   = 0x01105,
 239         CEPH_MDS_OP_RMXATTR    = 0x01106,
 240         CEPH_MDS_OP_SETLAYOUT  = 0x01107,
 241         CEPH_MDS_OP_SETATTR    = 0x01108,
 242
 243         CEPH_MDS_OP_MKNOD      = 0x01201,
 244         CEPH_MDS_OP_LINK       = 0x01202,
 245         CEPH_MDS_OP_UNLINK     = 0x01203,
 246         CEPH_MDS_OP_RENAME     = 0x01204,
 247         CEPH_MDS_OP_MKDIR      = 0x01220,
 248         CEPH_MDS_OP_RMDIR      = 0x01221,
 249         CEPH_MDS_OP_SYMLINK    = 0x01222,
 250
 251         CEPH_MDS_OP_CREATE     = 0x00301,
 252         CEPH_MDS_OP_OPEN       = 0x00302,
 253         CEPH_MDS_OP_READDIR    = 0x00305,
 254
 255         CEPH_MDS_OP_LOOKUPSNAP = 0x00400,
 256         CEPH_MDS_OP_MKSNAP     = 0x01400,
 257         CEPH_MDS_OP_RMSNAP     = 0x01401,
 258         CEPH_MDS_OP_LSSNAP     = 0x00402,
 259 };
 260
 261 extern const char *ceph_mds_op_name(int op);
 262
 263
 264 #define CEPH_SETATTR_MODE   1
 265 #define CEPH_SETATTR_UID    2
 266 #define CEPH_SETATTR_GID    4
 267 #define CEPH_SETATTR_MTIME  8
 268 #define CEPH_SETATTR_ATIME 16
 269 #define CEPH_SETATTR_SIZE  32
 270 #define CEPH_SETATTR_CTIME 64
 271
 272 union ceph_mds_request_args {
 273         struct {
 274                 __le32 mask;                 /* CEPH_CAP_* */
 275         } __attribute__ ((packed)) getattr;
 276         struct {
 277                 __le32 mode;
 278                 __le32 uid;
 279                 __le32 gid;
 280                 struct ceph_timespec mtime;
 281                 struct ceph_timespec atime;
 282                 __le64 size, old_size;       /* old_size needed by truncate */
 283                 __le32 mask;                 /* CEPH_SETATTR_* */
 284         } __attribute__ ((packed)) setattr;
 285         struct {
 286                 __le32 frag;                 /* which dir fragment */
 287                 __le32 max_entries;          /* how many dentries to grab */
 288         } __attribute__ ((packed)) readdir;
 289         struct {
 290                 __le32 mode;
 291                 __le32 rdev;
 292         } __attribute__ ((packed)) mknod;
 293         struct {
 294                 __le32 mode;
 295         } __attribute__ ((packed)) mkdir;
 296         struct {
 297                 __le32 flags;
 298                 __le32 mode;
 299                 __le32 stripe_unit;          /* layout for newly created file */
 300                 __le32 stripe_count;         /* ... */
 301                 __le32 object_size;
 302                 __le32 file_replication;
 303                 __le32 preferred;
 304         } __attribute__ ((packed)) open;
 305         struct {
 306                 __le32 flags;
 307         } __attribute__ ((packed)) setxattr;
 308         struct {
 309                 struct ceph_file_layout layout;
 310         } __attribute__ ((packed)) setlayout;
 311 } __attribute__ ((packed));
 312
 313 #define CEPH_MDS_FLAG_REPLAY        1  /* this is a replayed op */
 314 #define CEPH_MDS_FLAG_WANT_DENTRY   2  /* want dentry in reply */
 315
 316 struct ceph_mds_request_head {
 317         __le64 tid, oldest_client_tid;
 318         __le32 mdsmap_epoch;           /* on client */
 319         __le32 flags;                  /* CEPH_MDS_FLAG_* */
 320         __u8 num_retry, num_fwd;       /* count retry, fwd attempts */
 321         __le16 num_releases;           /* # include cap/lease release records */
 322         __le32 op;                     /* mds op code */
 323         __le32 caller_uid, caller_gid;
 324         __le64 ino;                    /* use this ino for openc, mkdir, mknod,
 325                                           etc. (if replaying) */
 326         union ceph_mds_request_args args;
 327 } __attribute__ ((packed));
 328
 329 /* cap/lease release record */
 330 struct ceph_mds_request_release {
 331         __le64 ino, cap_id;            /* ino and unique cap id */
 332         __le32 caps, wanted;           /* new issued, wanted */
 333         __le32 seq, issue_seq, mseq;
 334         __le32 dname_seq;              /* if releasing a dentry lease, a */
 335         __le32 dname_len;              /* string follows. */
 336 } __attribute__ ((packed));
 337
 338 /* client reply */
 339 struct ceph_mds_reply_head {
 340         __le64 tid;
 341         __le32 op;
 342         __le32 result;
 343         __le32 mdsmap_epoch;
 344         __u8 safe;                     /* true if committed to disk */
 345         __u8 is_dentry, is_target;     /* true if dentry, target inode records
 346                                           are included with reply */
 347 } __attribute__ ((packed));
 348
 349 /* one for each node split */
 350 struct ceph_frag_tree_split {
 351         __le32 frag;                   /* this frag splits... */
 352         __le32 by;                     /* ...by this many bits */
 353 } __attribute__ ((packed));
 354
 355 struct ceph_frag_tree_head {
 356         __le32 nsplits;                /* num ceph_frag_tree_split records */
 357         struct ceph_frag_tree_split splits[];
 358 } __attribute__ ((packed));
 359
 360 /* capability issue, for bundling with mds reply */
 361 struct ceph_mds_reply_cap {
 362         __le32 caps, wanted;           /* caps issued, wanted */
 363         __le64 cap_id;
 364         __le32 seq, mseq;
 365         __le64 realm;                  /* snap realm */
 366         __u8 flags;                    /* CEPH_CAP_FLAG_* */
 367 } __attribute__ ((packed));
 368
 369 #define CEPH_CAP_FLAG_AUTH  1          /* cap is issued by auth mds */
 370
 371 /* inode record, for bundling with mds reply */
 372 struct ceph_mds_reply_inode {
 373         __le64 ino;
 374         __le64 snapid;
 375         __le32 rdev;
 376         __le64 version;                /* inode version */
 377         __le64 xattr_version;          /* version for xattr blob */
 378         struct ceph_mds_reply_cap cap; /* caps issued for this inode */
 379         struct ceph_file_layout layout;
 380         struct ceph_timespec ctime, mtime, atime;
 381         __le32 time_warp_seq;
 382         __le64 size, max_size, truncate_size;
 383         __le32 truncate_seq;
 384         __le32 mode, uid, gid;
 385         __le32 nlink;
 386         __le64 files, subdirs, rbytes, rfiles, rsubdirs;  /* dir stats */
 387         struct ceph_timespec rctime;
 388         struct ceph_frag_tree_head fragtree;  /* (must be at end of struct) */
 389 } __attribute__ ((packed));
 390 /* followed by frag array, then symlink string, then xattr blob */
 391
 392 /* reply_lease follows dname, and reply_inode */
 393 struct ceph_mds_reply_lease {
 394         __le16 mask;            /* lease type(s) */
 395         __le32 duration_ms;     /* lease duration */
 396         __le32 seq;
 397 } __attribute__ ((packed));
 398
 399 struct ceph_mds_reply_dirfrag {
 400         __le32 frag;            /* fragment */
 401         __le32 auth;            /* auth mds, if this is a delegation point */
 402         __le32 ndist;           /* number of mds' this is replicated on */
 403         __le32 dist[];
 404 } __attribute__ ((packed));
 405
 406 /* file access modes */
 407 #define CEPH_FILE_MODE_PIN        0
 408 #define CEPH_FILE_MODE_RD         1
 409 #define CEPH_FILE_MODE_WR         2
 410 #define CEPH_FILE_MODE_RDWR       3  /* RD | WR */
 411 #define CEPH_FILE_MODE_LAZY       4  /* lazy io */
 412 #define CEPH_FILE_MODE_NUM        8  /* bc these are bit fields.. mostly */
 413
 414 int ceph_flags_to_mode(int flags);
 415
 416
 417 /* capability bits */
 418 #define CEPH_CAP_PIN         1  /* no specific capabilities beyond the pin */
 419
 420 /* generic cap bits */
 421 #define CEPH_CAP_GSHARED     1  /* client can reads */
 422 #define CEPH_CAP_GEXCL       2  /* client can read and update */
 423 #define CEPH_CAP_GCACHE      4  /* (file) client can cache reads */
 424 #define CEPH_CAP_GRD         8  /* (file) client can read */
 425 #define CEPH_CAP_GWR        16  /* (file) client can write */
 426 #define CEPH_CAP_GBUFFER    32  /* (file) client can buffer writes */
 427 #define CEPH_CAP_GWREXTEND  64  /* (file) client can extend EOF */
 428 #define CEPH_CAP_GLAZYIO   128  /* (file) client can perform lazy io */
 429
 430 /* per-lock shift */
 431 #define CEPH_CAP_SAUTH      2
 432 #define CEPH_CAP_SLINK      4
 433 #define CEPH_CAP_SXATTR     6
 434 #define CEPH_CAP_SFILE      8   /* goes at the end (uses >2 cap bits) */
 435
 436 #define CEPH_CAP_BITS       16
 437
 438 /* composed values */
 439 #define CEPH_CAP_AUTH_SHARED  (CEPH_CAP_GSHARED  << CEPH_CAP_SAUTH)
 440 #define CEPH_CAP_AUTH_EXCL     (CEPH_CAP_GEXCL     << CEPH_CAP_SAUTH)
 441 #define CEPH_CAP_LINK_SHARED  (CEPH_CAP_GSHARED  << CEPH_CAP_SLINK)
 442 #define CEPH_CAP_LINK_EXCL     (CEPH_CAP_GEXCL     << CEPH_CAP_SLINK)
 443 #define CEPH_CAP_XATTR_SHARED (CEPH_CAP_GSHARED  << CEPH_CAP_SXATTR)
 444 #define CEPH_CAP_XATTR_EXCL    (CEPH_CAP_GEXCL     << CEPH_CAP_SXATTR)
 445 #define CEPH_CAP_FILE(x)    (x << CEPH_CAP_SFILE)
 446 #define CEPH_CAP_FILE_SHARED   (CEPH_CAP_GSHARED   << CEPH_CAP_SFILE)
 447 #define CEPH_CAP_FILE_EXCL     (CEPH_CAP_GEXCL     << CEPH_CAP_SFILE)
 448 #define CEPH_CAP_FILE_CACHE    (CEPH_CAP_GCACHE    << CEPH_CAP_SFILE)
 449 #define CEPH_CAP_FILE_RD       (CEPH_CAP_GRD       << CEPH_CAP_SFILE)
 450 #define CEPH_CAP_FILE_WR       (CEPH_CAP_GWR       << CEPH_CAP_SFILE)
 451 #define CEPH_CAP_FILE_BUFFER   (CEPH_CAP_GBUFFER   << CEPH_CAP_SFILE)
 452 #define CEPH_CAP_FILE_WREXTEND (CEPH_CAP_GWREXTEND << CEPH_CAP_SFILE)
 453 #define CEPH_CAP_FILE_LAZYIO   (CEPH_CAP_GLAZYIO   << CEPH_CAP_SFILE)
 454
 455 /* cap masks (for getattr) */
 456 #define CEPH_STAT_CAP_INODE    CEPH_CAP_PIN
 457 #define CEPH_STAT_CAP_TYPE     CEPH_CAP_PIN  /* mode >> 12 */
 458 #define CEPH_STAT_CAP_SYMLINK  CEPH_CAP_PIN
 459 #define CEPH_STAT_CAP_UID      CEPH_CAP_AUTH_SHARED
 460 #define CEPH_STAT_CAP_GID      CEPH_CAP_AUTH_SHARED
 461 #define CEPH_STAT_CAP_MODE     CEPH_CAP_AUTH_SHARED
 462 #define CEPH_STAT_CAP_NLINK    CEPH_CAP_LINK_SHARED
 463 #define CEPH_STAT_CAP_LAYOUT   CEPH_CAP_FILE_SHARED
 464 #define CEPH_STAT_CAP_MTIME    CEPH_CAP_FILE_SHARED
 465 #define CEPH_STAT_CAP_SIZE     CEPH_CAP_FILE_SHARED
 466 #define CEPH_STAT_CAP_ATIME    CEPH_CAP_FILE_SHARED  /* fixme */
 467 #define CEPH_STAT_CAP_XATTR    CEPH_CAP_XATTR_SHARED
 468 #define CEPH_STAT_CAP_INODE_ALL (CEPH_CAP_PIN |                 \
 469                                  CEPH_CAP_AUTH_SHARED | \
 470                                  CEPH_CAP_LINK_SHARED | \
 471                                  CEPH_CAP_FILE_SHARED | \
 472                                  CEPH_CAP_XATTR_SHARED)
 473
 474 #define CEPH_CAP_ANY_SHARED (CEPH_CAP_AUTH_SHARED |                     \
 475                               CEPH_CAP_LINK_SHARED |                    \
 476                               CEPH_CAP_XATTR_SHARED |                   \
 477                               CEPH_CAP_FILE_SHARED)
 478 #define CEPH_CAP_ANY_RD   (CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_RD |     \
 479                            CEPH_CAP_FILE_CACHE)
 480
 481 #define CEPH_CAP_ANY_EXCL (CEPH_CAP_AUTH_EXCL |         \
 482                            CEPH_CAP_LINK_EXCL |         \
 483                            CEPH_CAP_XATTR_EXCL |        \
 484                            CEPH_CAP_FILE_EXCL)
 485 #define CEPH_CAP_ANY_FILE_WR (CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER | \
 486                               CEPH_CAP_FILE_EXCL)
 487 #define CEPH_CAP_ANY_WR   (CEPH_CAP_ANY_EXCL | CEPH_CAP_ANY_FILE_WR)
 488 #define CEPH_CAP_ANY      (CEPH_CAP_ANY_RD | CEPH_CAP_ANY_EXCL | \
 489                            CEPH_CAP_ANY_FILE_WR | CEPH_CAP_PIN)
 490
 491 #define CEPH_CAP_LOCKS (CEPH_LOCK_IFILE | CEPH_LOCK_IAUTH | CEPH_LOCK_ILINK | \
 492                         CEPH_LOCK_IXATTR)
 493
 494 int ceph_caps_for_mode(int mode);
 495
 496 enum {
 497         CEPH_CAP_OP_GRANT,         /* mds->client grant */
 498         CEPH_CAP_OP_REVOKE,        /* mds->client revoke */
 499         CEPH_CAP_OP_TRUNC,         /* mds->client trunc notify */
 500         CEPH_CAP_OP_EXPORT,        /* mds has exported the cap */
 501         CEPH_CAP_OP_IMPORT,        /* mds has imported the cap */
 502         CEPH_CAP_OP_UPDATE,        /* client->mds update */
 503         CEPH_CAP_OP_DROP,          /* client->mds drop cap bits */
 504         CEPH_CAP_OP_FLUSH,         /* client->mds cap writeback */
 505         CEPH_CAP_OP_FLUSH_ACK,     /* mds->client flushed */
 506         CEPH_CAP_OP_FLUSHSNAP,     /* client->mds flush snapped metadata */
 507         CEPH_CAP_OP_FLUSHSNAP_ACK, /* mds->client flushed snapped metadata */
 508         CEPH_CAP_OP_RELEASE,       /* client->mds release (clean) cap */
 509         CEPH_CAP_OP_RENEW,         /* client->mds renewal request */
 510 };
 511
 512 extern const char *ceph_cap_op_name(int op);
 513
 514 /*
 515  * caps message, used for capability callbacks, acks, requests, etc.
 516  */
 517 struct ceph_mds_caps {
 518         __le32 op;                  /* CEPH_CAP_OP_* */
 519         __le64 ino, realm;
 520         __le64 cap_id;
 521         __le32 seq, issue_seq;
 522         __le32 caps, wanted, dirty; /* latest issued/wanted/dirty */
 523         __le32 migrate_seq;
 524         __le64 snap_follows;
 525         __le32 snap_trace_len;
 526         __le64 client_tid;          /* for FLUSH(SNAP) -> FLUSH(SNAP)_ACK */
 527
 528         /* authlock */
 529         __le32 uid, gid, mode;
 530
 531         /* linklock */
 532         __le32 nlink;
 533
 534         /* xattrlock */
 535         __le32 xattr_len;
 536         __le64 xattr_version;
 537
 538         /* filelock */
 539         __le64 size, max_size, truncate_size;
 540         __le32 truncate_seq;
 541         struct ceph_timespec mtime, atime, ctime;
 542         struct ceph_file_layout layout;
 543         __le32 time_warp_seq;
 544 } __attribute__ ((packed));
 545
 546 /* cap release msg head */
 547 struct ceph_mds_cap_release {
 548         __le32 num;                /* number of cap_items that follow */
 549 } __attribute__ ((packed));
 550
 551 struct ceph_mds_cap_item {
 552         __le64 ino;
 553         __le64 cap_id;
 554         __le32 migrate_seq, seq;
 555 } __attribute__ ((packed));
 556
 557 #define CEPH_MDS_LEASE_REVOKE           1  /*    mds  -> client */
 558 #define CEPH_MDS_LEASE_RELEASE          2  /* client  -> mds    */
 559 #define CEPH_MDS_LEASE_RENEW            3  /* client <-> mds    */
 560 #define CEPH_MDS_LEASE_REVOKE_ACK       4  /* client  -> mds    */
 561
 562 extern const char *ceph_lease_op_name(int o);
 563
 564 /* lease msg header */
 565 struct ceph_mds_lease {
 566         __u8 action;            /* CEPH_MDS_LEASE_* */
 567         __le16 mask;            /* which lease */
 568         __le64 ino;
 569         __le64 first, last;     /* snap range */
 570         __le32 seq;
 571         __le32 duration_ms;     /* duration of renewal */
 572 } __attribute__ ((packed));
 573 /* followed by a __le32+string for dname */
 574
 575 /* client reconnect */
 576 struct ceph_mds_cap_reconnect {
 577         __le64 cap_id;
 578         __le32 wanted;
 579         __le32 issued;
 580         __le64 size;
 581         struct ceph_timespec mtime, atime;
 582         __le64 snaprealm;
 583         __le64 pathbase;        /* base ino for our path to this ino */
 584 } __attribute__ ((packed));
 585 /* followed by encoded string */
 586
 587 struct ceph_mds_snaprealm_reconnect {
 588         __le64 ino;     /* snap realm base */
 589         __le64 seq;     /* snap seq for this snap realm */
 590         __le64 parent;  /* parent realm */
 591 } __attribute__ ((packed));
 592
 593 /*
 594  * snaps
 595  */
 596 enum {
 597         CEPH_SNAP_OP_UPDATE,  /* CREATE or DESTROY */
 598         CEPH_SNAP_OP_CREATE,
 599         CEPH_SNAP_OP_DESTROY,
 600         CEPH_SNAP_OP_SPLIT,
 601 };
 602
 603 extern const char *ceph_snap_op_name(int o);
 604
 605 /* snap msg header */
 606 struct ceph_mds_snap_head {
 607         __le32 op;                /* CEPH_SNAP_OP_* */
 608         __le64 split;             /* ino to split off, if any */
 609         __le32 num_split_inos;    /* # inos belonging to new child realm */
 610         __le32 num_split_realms;  /* # child realms udner new child realm */
 611         __le32 trace_len;         /* size of snap trace blob */
 612 } __attribute__ ((packed));
 613 /* followed by split ino list, then split realms, then the trace blob */
 614
 615 /*
 616  * encode info about a snaprealm, as viewed by a client
 617  */
 618 struct ceph_mds_snap_realm {
 619         __le64 ino;           /* ino */
 620         __le64 created;       /* snap: when created */
 621         __le64 parent;        /* ino: parent realm */
 622         __le64 parent_since;  /* snap: same parent since */
 623         __le64 seq;           /* snap: version */
 624         __le32 num_snaps;
 625         __le32 num_prior_parent_snaps;
 626 } __attribute__ ((packed));
 627 /* followed by my snap list, then prior parent snap list */
 628
 629 #endif