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 19
  23 #define CEPH_VERSION_PATCH 0
  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     8 /* cluster internal */
  39 #define CEPH_MDS_PROTOCOL     9 /* cluster internal */
  40 #define CEPH_MON_PROTOCOL     5 /* cluster internal */
  41 #define CEPH_OSDC_PROTOCOL   24 /* server/client */
  42 #define CEPH_MDSC_PROTOCOL   32 /* server/client */
  43 #define CEPH_MONC_PROTOCOL   15 /* server/client */
  44
  45
  46 #define CEPH_INO_ROOT  1
  47 #define CEPH_INO_CEPH  2        /* hidden .ceph dir */
  48
  49 /* arbitrary limit on max # of monitors (cluster of 3 is typical) */
  50 #define CEPH_MAX_MON   31
  51
  52
  53 /*
  54  * feature bits
  55  */
  56 #define CEPH_FEATURE_SUPPORTED  0
  57 #define CEPH_FEATURE_REQUIRED   0
  58
  59
  60 /*
  61  * ceph_file_layout - describe data layout for a file/inode
  62  */
  63 struct ceph_file_layout {
  64         /* file -> object mapping */
  65         __le32 fl_stripe_unit;     /* stripe unit, in bytes.  must be multiple
  66                                       of page size. */
  67         __le32 fl_stripe_count;    /* over this many objects */
  68         __le32 fl_object_size;     /* until objects are this big, then move to
  69                                       new objects */
  70         __le32 fl_cas_hash;        /* 0 = none; 1 = sha256 */
  71
  72         /* pg -> disk layout */
  73         __le32 fl_object_stripe_unit;  /* for per-object parity, if any */
  74
  75         /* object -> pg layout */
  76         __le32 fl_pg_preferred; /* preferred primary for pg (-1 for none) */
  77         __le32 fl_pg_pool;      /* namespace, crush ruleset, rep level */
  78 } __attribute__ ((packed));
  79
  80 #define CEPH_MIN_STRIPE_UNIT 65536
  81
  82 int ceph_file_layout_is_valid(const struct ceph_file_layout *layout);
  83
  84
  85 /* crypto algorithms */
  86 #define CEPH_CRYPTO_NONE 0x0
  87 #define CEPH_CRYPTO_AES  0x1
  88
  89 /* security/authentication protocols */
  90 #define CEPH_AUTH_UNKNOWN       0x0
  91 #define CEPH_AUTH_NONE          0x1
  92 #define CEPH_AUTH_CEPHX         0x2
  93
  94
  95 /*********************************************
  96  * message layer
  97  */
  98
  99 /*
 100  * message types
 101  */
 102
 103 /* misc */
 104 #define CEPH_MSG_SHUTDOWN               1
 105 #define CEPH_MSG_PING                   2
 106
 107 /* client <-> monitor */
 108 #define CEPH_MSG_MON_MAP                4
 109 #define CEPH_MSG_MON_GET_MAP            5
 110 #define CEPH_MSG_STATFS                 13
 111 #define CEPH_MSG_STATFS_REPLY           14
 112 #define CEPH_MSG_MON_SUBSCRIBE          15
 113 #define CEPH_MSG_MON_SUBSCRIBE_ACK      16
 114 #define CEPH_MSG_AUTH                   17
 115 #define CEPH_MSG_AUTH_REPLY             18
 116
 117 /* client <-> mds */
 118 #define CEPH_MSG_MDS_MAP                21
 119
 120 #define CEPH_MSG_CLIENT_SESSION         22
 121 #define CEPH_MSG_CLIENT_RECONNECT       23
 122
 123 #define CEPH_MSG_CLIENT_REQUEST         24
 124 #define CEPH_MSG_CLIENT_REQUEST_FORWARD 25
 125 #define CEPH_MSG_CLIENT_REPLY           26
 126 #define CEPH_MSG_CLIENT_CAPS            0x310
 127 #define CEPH_MSG_CLIENT_LEASE           0x311
 128 #define CEPH_MSG_CLIENT_SNAP            0x312
 129 #define CEPH_MSG_CLIENT_CAPRELEASE      0x313
 130
 131 /* osd */
 132 #define CEPH_MSG_OSD_MAP          41
 133 #define CEPH_MSG_OSD_OP           42
 134 #define CEPH_MSG_OSD_OPREPLY      43
 135
 136 struct ceph_mon_request_header {
 137         __le64 have_version;
 138         __le16 session_mon;
 139         __le64 session_mon_tid;
 140 } __attribute__ ((packed));
 141
 142 struct ceph_mon_statfs {
 143         struct ceph_mon_request_header monhdr;
 144         struct ceph_fsid fsid;
 145 } __attribute__ ((packed));
 146
 147 struct ceph_statfs {
 148         __le64 kb, kb_used, kb_avail;
 149         __le64 num_objects;
 150 } __attribute__ ((packed));
 151
 152 struct ceph_mon_statfs_reply {
 153         struct ceph_fsid fsid;
 154         __le64 version;
 155         struct ceph_statfs st;
 156 } __attribute__ ((packed));
 157
 158 struct ceph_osd_getmap {
 159         struct ceph_mon_request_header monhdr;
 160         struct ceph_fsid fsid;
 161         __le32 start;
 162 } __attribute__ ((packed));
 163
 164 struct ceph_mds_getmap {
 165         struct ceph_mon_request_header monhdr;
 166         struct ceph_fsid fsid;
 167 } __attribute__ ((packed));
 168
 169 struct ceph_client_mount {
 170         struct ceph_mon_request_header monhdr;
 171 } __attribute__ ((packed));
 172
 173 struct ceph_mon_subscribe_item {
 174         __le64 have_version;    __le64 have;
 175         __u8 onetime;
 176 } __attribute__ ((packed));
 177
 178 struct ceph_mon_subscribe_ack {
 179         __le32 duration;         /* seconds */
 180         struct ceph_fsid fsid;
 181 } __attribute__ ((packed));
 182
 183 /*
 184  * mds states
 185  *   > 0 -> in
 186  *  <= 0 -> out
 187  */
 188 #define CEPH_MDS_STATE_DNE          0  /* down, does not exist. */
 189 #define CEPH_MDS_STATE_STOPPED     -1  /* down, once existed, but no subtrees.
 190                                           empty log. */
 191 #define CEPH_MDS_STATE_BOOT        -4  /* up, boot announcement. */
 192 #define CEPH_MDS_STATE_STANDBY     -5  /* up, idle.  waiting for assignment. */
 193 #define CEPH_MDS_STATE_CREATING    -6  /* up, creating MDS instance. */
 194 #define CEPH_MDS_STATE_STARTING    -7  /* up, starting previously stopped mds */
 195 #define CEPH_MDS_STATE_STANDBY_REPLAY -8 /* up, tailing active node's journal */
 196
 197 #define CEPH_MDS_STATE_REPLAY       8  /* up, replaying journal. */
 198 #define CEPH_MDS_STATE_RESOLVE      9  /* up, disambiguating distributed
 199                                           operations (import, rename, etc.) */
 200 #define CEPH_MDS_STATE_RECONNECT    10 /* up, reconnect to clients */
 201 #define CEPH_MDS_STATE_REJOIN       11 /* up, rejoining distributed cache */
 202 #define CEPH_MDS_STATE_CLIENTREPLAY 12 /* up, replaying client operations */
 203 #define CEPH_MDS_STATE_ACTIVE       13 /* up, active */
 204 #define CEPH_MDS_STATE_STOPPING     14 /* up, but exporting metadata */
 205
 206 extern const char *ceph_mds_state_name(int s);
 207
 208
 209 /*
 210  * metadata lock types.
 211  *  - these are bitmasks.. we can compose them
 212  *  - they also define the lock ordering by the MDS
 213  *  - a few of these are internal to the mds
 214  */
 215 #define CEPH_LOCK_DN          1
 216 #define CEPH_LOCK_ISNAP       2
 217 #define CEPH_LOCK_IVERSION    4     /* mds internal */
 218 #define CEPH_LOCK_IFILE       8     /* mds internal */
 219 #define CEPH_LOCK_IAUTH       32
 220 #define CEPH_LOCK_ILINK       64
 221 #define CEPH_LOCK_IDFT        128   /* dir frag tree */
 222 #define CEPH_LOCK_INEST       256   /* mds internal */
 223 #define CEPH_LOCK_IXATTR      512
 224 #define CEPH_LOCK_INO         2048  /* immutable inode bits; not a lock */
 225
 226 /* client_session ops */
 227 enum {
 228         CEPH_SESSION_REQUEST_OPEN,
 229         CEPH_SESSION_OPEN,
 230         CEPH_SESSION_REQUEST_CLOSE,
 231         CEPH_SESSION_CLOSE,
 232         CEPH_SESSION_REQUEST_RENEWCAPS,
 233         CEPH_SESSION_RENEWCAPS,
 234         CEPH_SESSION_STALE,
 235         CEPH_SESSION_RECALL_STATE,
 236 };
 237
 238 extern const char *ceph_session_op_name(int op);
 239
 240 struct ceph_mds_session_head {
 241         __le32 op;
 242         __le64 seq;
 243         struct ceph_timespec stamp;
 244         __le32 max_caps, max_leases;
 245 } __attribute__ ((packed));
 246
 247 /* client_request */
 248 /*
 249  * metadata ops.
 250  *  & 0x001000 -> write op
 251  *  & 0x010000 -> follow symlink (e.g. stat(), not lstat()).
 252  &  & 0x100000 -> use weird ino/path trace
 253  */
 254 #define CEPH_MDS_OP_WRITE        0x001000
 255 enum {
 256         CEPH_MDS_OP_LOOKUP     = 0x00100,
 257         CEPH_MDS_OP_GETATTR    = 0x00101,
 258         CEPH_MDS_OP_LOOKUPHASH = 0x00102,
 259         CEPH_MDS_OP_LOOKUPPARENT = 0x00103,
 260
 261         CEPH_MDS_OP_SETXATTR   = 0x01105,
 262         CEPH_MDS_OP_RMXATTR    = 0x01106,
 263         CEPH_MDS_OP_SETLAYOUT  = 0x01107,
 264         CEPH_MDS_OP_SETATTR    = 0x01108,
 265
 266         CEPH_MDS_OP_MKNOD      = 0x01201,
 267         CEPH_MDS_OP_LINK       = 0x01202,
 268         CEPH_MDS_OP_UNLINK     = 0x01203,
 269         CEPH_MDS_OP_RENAME     = 0x01204,
 270         CEPH_MDS_OP_MKDIR      = 0x01220,
 271         CEPH_MDS_OP_RMDIR      = 0x01221,
 272         CEPH_MDS_OP_SYMLINK    = 0x01222,
 273
 274         CEPH_MDS_OP_CREATE     = 0x01301,
 275         CEPH_MDS_OP_OPEN       = 0x00302,
 276         CEPH_MDS_OP_READDIR    = 0x00305,
 277
 278         CEPH_MDS_OP_LOOKUPSNAP = 0x00400,
 279         CEPH_MDS_OP_MKSNAP     = 0x01400,
 280         CEPH_MDS_OP_RMSNAP     = 0x01401,
 281         CEPH_MDS_OP_LSSNAP     = 0x00402,
 282 };
 283
 284 extern const char *ceph_mds_op_name(int op);
 285
 286
 287 #define CEPH_SETATTR_MODE   1
 288 #define CEPH_SETATTR_UID    2
 289 #define CEPH_SETATTR_GID    4
 290 #define CEPH_SETATTR_MTIME  8
 291 #define CEPH_SETATTR_ATIME 16
 292 #define CEPH_SETATTR_SIZE  32
 293 #define CEPH_SETATTR_CTIME 64
 294
 295 union ceph_mds_request_args {
 296         struct {
 297                 __le32 mask;                 /* CEPH_CAP_* */
 298         } __attribute__ ((packed)) getattr;
 299         struct {
 300                 __le32 mode;
 301                 __le32 uid;
 302                 __le32 gid;
 303                 struct ceph_timespec mtime;
 304                 struct ceph_timespec atime;
 305                 __le64 size, old_size;       /* old_size needed by truncate */
 306                 __le32 mask;                 /* CEPH_SETATTR_* */
 307         } __attribute__ ((packed)) setattr;
 308         struct {
 309                 __le32 frag;                 /* which dir fragment */
 310                 __le32 max_entries;          /* how many dentries to grab */
 311         } __attribute__ ((packed)) readdir;
 312         struct {
 313                 __le32 mode;
 314                 __le32 rdev;
 315         } __attribute__ ((packed)) mknod;
 316         struct {
 317                 __le32 mode;
 318         } __attribute__ ((packed)) mkdir;
 319         struct {
 320                 __le32 flags;
 321                 __le32 mode;
 322                 __le32 stripe_unit;          /* layout for newly created file */
 323                 __le32 stripe_count;         /* ... */
 324                 __le32 object_size;
 325                 __le32 file_replication;
 326                 __le32 preferred;
 327         } __attribute__ ((packed)) open;
 328         struct {
 329                 __le32 flags;
 330         } __attribute__ ((packed)) setxattr;
 331         struct {
 332                 struct ceph_file_layout layout;
 333         } __attribute__ ((packed)) setlayout;
 334 } __attribute__ ((packed));
 335
 336 #define CEPH_MDS_FLAG_REPLAY        1  /* this is a replayed op */
 337 #define CEPH_MDS_FLAG_WANT_DENTRY   2  /* want dentry in reply */
 338
 339 struct ceph_mds_request_head {
 340         __le64 oldest_client_tid;
 341         __le32 mdsmap_epoch;           /* on client */
 342         __le32 flags;                  /* CEPH_MDS_FLAG_* */
 343         __u8 num_retry, num_fwd;       /* count retry, fwd attempts */
 344         __le16 num_releases;           /* # include cap/lease release records */
 345         __le32 op;                     /* mds op code */
 346         __le32 caller_uid, caller_gid;
 347         __le64 ino;                    /* use this ino for openc, mkdir, mknod,
 348                                           etc. (if replaying) */
 349         union ceph_mds_request_args args;
 350 } __attribute__ ((packed));
 351
 352 /* cap/lease release record */
 353 struct ceph_mds_request_release {
 354         __le64 ino, cap_id;            /* ino and unique cap id */
 355         __le32 caps, wanted;           /* new issued, wanted */
 356         __le32 seq, issue_seq, mseq;
 357         __le32 dname_seq;              /* if releasing a dentry lease, a */
 358         __le32 dname_len;              /* string follows. */
 359 } __attribute__ ((packed));
 360
 361 /* client reply */
 362 struct ceph_mds_reply_head {
 363         __le32 op;
 364         __le32 result;
 365         __le32 mdsmap_epoch;
 366         __u8 safe;                     /* true if committed to disk */
 367         __u8 is_dentry, is_target;     /* true if dentry, target inode records
 368                                           are included with reply */
 369 } __attribute__ ((packed));
 370
 371 /* one for each node split */
 372 struct ceph_frag_tree_split {
 373         __le32 frag;                   /* this frag splits... */
 374         __le32 by;                     /* ...by this many bits */
 375 } __attribute__ ((packed));
 376
 377 struct ceph_frag_tree_head {
 378         __le32 nsplits;                /* num ceph_frag_tree_split records */
 379         struct ceph_frag_tree_split splits[];
 380 } __attribute__ ((packed));
 381
 382 /* capability issue, for bundling with mds reply */
 383 struct ceph_mds_reply_cap {
 384         __le32 caps, wanted;           /* caps issued, wanted */
 385         __le64 cap_id;
 386         __le32 seq, mseq;
 387         __le64 realm;                  /* snap realm */
 388         __u8 flags;                    /* CEPH_CAP_FLAG_* */
 389 } __attribute__ ((packed));
 390
 391 #define CEPH_CAP_FLAG_AUTH  1          /* cap is issued by auth mds */
 392
 393 /* inode record, for bundling with mds reply */
 394 struct ceph_mds_reply_inode {
 395         __le64 ino;
 396         __le64 snapid;
 397         __le32 rdev;
 398         __le64 version;                /* inode version */
 399         __le64 xattr_version;          /* version for xattr blob */
 400         struct ceph_mds_reply_cap cap; /* caps issued for this inode */
 401         struct ceph_file_layout layout;
 402         struct ceph_timespec ctime, mtime, atime;
 403         __le32 time_warp_seq;
 404         __le64 size, max_size, truncate_size;
 405         __le32 truncate_seq;
 406         __le32 mode, uid, gid;
 407         __le32 nlink;
 408         __le64 files, subdirs, rbytes, rfiles, rsubdirs;  /* dir stats */
 409         struct ceph_timespec rctime;
 410         struct ceph_frag_tree_head fragtree;  /* (must be at end of struct) */
 411 } __attribute__ ((packed));
 412 /* followed by frag array, then symlink string, then xattr blob */
 413
 414 /* reply_lease follows dname, and reply_inode */
 415 struct ceph_mds_reply_lease {
 416         __le16 mask;            /* lease type(s) */
 417         __le32 duration_ms;     /* lease duration */
 418         __le32 seq;
 419 } __attribute__ ((packed));
 420
 421 struct ceph_mds_reply_dirfrag {
 422         __le32 frag;            /* fragment */
 423         __le32 auth;            /* auth mds, if this is a delegation point */
 424         __le32 ndist;           /* number of mds' this is replicated on */
 425         __le32 dist[];
 426 } __attribute__ ((packed));
 427
 428 /* file access modes */
 429 #define CEPH_FILE_MODE_PIN        0
 430 #define CEPH_FILE_MODE_RD         1
 431 #define CEPH_FILE_MODE_WR         2
 432 #define CEPH_FILE_MODE_RDWR       3  /* RD | WR */
 433 #define CEPH_FILE_MODE_LAZY       4  /* lazy io */
 434 #define CEPH_FILE_MODE_NUM        8  /* bc these are bit fields.. mostly */
 435
 436 int ceph_flags_to_mode(int flags);
 437
 438
 439 /* capability bits */
 440 #define CEPH_CAP_PIN         1  /* no specific capabilities beyond the pin */
 441
 442 /* generic cap bits */
 443 #define CEPH_CAP_GSHARED     1  /* client can reads */
 444 #define CEPH_CAP_GEXCL       2  /* client can read and update */
 445 #define CEPH_CAP_GCACHE      4  /* (file) client can cache reads */
 446 #define CEPH_CAP_GRD         8  /* (file) client can read */
 447 #define CEPH_CAP_GWR        16  /* (file) client can write */
 448 #define CEPH_CAP_GBUFFER    32  /* (file) client can buffer writes */
 449 #define CEPH_CAP_GWREXTEND  64  /* (file) client can extend EOF */
 450 #define CEPH_CAP_GLAZYIO   128  /* (file) client can perform lazy io */
 451
 452 /* per-lock shift */
 453 #define CEPH_CAP_SAUTH      2
 454 #define CEPH_CAP_SLINK      4
 455 #define CEPH_CAP_SXATTR     6
 456 #define CEPH_CAP_SFILE      8   /* goes at the end (uses >2 cap bits) */
 457
 458 #define CEPH_CAP_BITS       16
 459
 460 /* composed values */
 461 #define CEPH_CAP_AUTH_SHARED  (CEPH_CAP_GSHARED  << CEPH_CAP_SAUTH)
 462 #define CEPH_CAP_AUTH_EXCL     (CEPH_CAP_GEXCL     << CEPH_CAP_SAUTH)
 463 #define CEPH_CAP_LINK_SHARED  (CEPH_CAP_GSHARED  << CEPH_CAP_SLINK)
 464 #define CEPH_CAP_LINK_EXCL     (CEPH_CAP_GEXCL     << CEPH_CAP_SLINK)
 465 #define CEPH_CAP_XATTR_SHARED (CEPH_CAP_GSHARED  << CEPH_CAP_SXATTR)
 466 #define CEPH_CAP_XATTR_EXCL    (CEPH_CAP_GEXCL     << CEPH_CAP_SXATTR)
 467 #define CEPH_CAP_FILE(x)    (x << CEPH_CAP_SFILE)
 468 #define CEPH_CAP_FILE_SHARED   (CEPH_CAP_GSHARED   << CEPH_CAP_SFILE)
 469 #define CEPH_CAP_FILE_EXCL     (CEPH_CAP_GEXCL     << CEPH_CAP_SFILE)
 470 #define CEPH_CAP_FILE_CACHE    (CEPH_CAP_GCACHE    << CEPH_CAP_SFILE)
 471 #define CEPH_CAP_FILE_RD       (CEPH_CAP_GRD       << CEPH_CAP_SFILE)
 472 #define CEPH_CAP_FILE_WR       (CEPH_CAP_GWR       << CEPH_CAP_SFILE)
 473 #define CEPH_CAP_FILE_BUFFER   (CEPH_CAP_GBUFFER   << CEPH_CAP_SFILE)
 474 #define CEPH_CAP_FILE_WREXTEND (CEPH_CAP_GWREXTEND << CEPH_CAP_SFILE)
 475 #define CEPH_CAP_FILE_LAZYIO   (CEPH_CAP_GLAZYIO   << CEPH_CAP_SFILE)
 476
 477 /* cap masks (for getattr) */
 478 #define CEPH_STAT_CAP_INODE    CEPH_CAP_PIN
 479 #define CEPH_STAT_CAP_TYPE     CEPH_CAP_PIN  /* mode >> 12 */
 480 #define CEPH_STAT_CAP_SYMLINK  CEPH_CAP_PIN
 481 #define CEPH_STAT_CAP_UID      CEPH_CAP_AUTH_SHARED
 482 #define CEPH_STAT_CAP_GID      CEPH_CAP_AUTH_SHARED
 483 #define CEPH_STAT_CAP_MODE     CEPH_CAP_AUTH_SHARED
 484 #define CEPH_STAT_CAP_NLINK    CEPH_CAP_LINK_SHARED
 485 #define CEPH_STAT_CAP_LAYOUT   CEPH_CAP_FILE_SHARED
 486 #define CEPH_STAT_CAP_MTIME    CEPH_CAP_FILE_SHARED
 487 #define CEPH_STAT_CAP_SIZE     CEPH_CAP_FILE_SHARED
 488 #define CEPH_STAT_CAP_ATIME    CEPH_CAP_FILE_SHARED  /* fixme */
 489 #define CEPH_STAT_CAP_XATTR    CEPH_CAP_XATTR_SHARED
 490 #define CEPH_STAT_CAP_INODE_ALL (CEPH_CAP_PIN |                 \
 491                                  CEPH_CAP_AUTH_SHARED | \
 492                                  CEPH_CAP_LINK_SHARED | \
 493                                  CEPH_CAP_FILE_SHARED | \
 494                                  CEPH_CAP_XATTR_SHARED)
 495
 496 #define CEPH_CAP_ANY_SHARED (CEPH_CAP_AUTH_SHARED |                     \
 497                               CEPH_CAP_LINK_SHARED |                    \
 498                               CEPH_CAP_XATTR_SHARED |                   \
 499                               CEPH_CAP_FILE_SHARED)
 500 #define CEPH_CAP_ANY_RD   (CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_RD |     \
 501                            CEPH_CAP_FILE_CACHE)
 502
 503 #define CEPH_CAP_ANY_EXCL (CEPH_CAP_AUTH_EXCL |         \
 504                            CEPH_CAP_LINK_EXCL |         \
 505                            CEPH_CAP_XATTR_EXCL |        \
 506                            CEPH_CAP_FILE_EXCL)
 507 #define CEPH_CAP_ANY_FILE_WR (CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER | \
 508                               CEPH_CAP_FILE_EXCL)
 509 #define CEPH_CAP_ANY_WR   (CEPH_CAP_ANY_EXCL | CEPH_CAP_ANY_FILE_WR)
 510 #define CEPH_CAP_ANY      (CEPH_CAP_ANY_RD | CEPH_CAP_ANY_EXCL | \
 511                            CEPH_CAP_ANY_FILE_WR | CEPH_CAP_PIN)
 512
 513 #define CEPH_CAP_LOCKS (CEPH_LOCK_IFILE | CEPH_LOCK_IAUTH | CEPH_LOCK_ILINK | \
 514                         CEPH_LOCK_IXATTR)
 515
 516 int ceph_caps_for_mode(int mode);
 517
 518 enum {
 519         CEPH_CAP_OP_GRANT,         /* mds->client grant */
 520         CEPH_CAP_OP_REVOKE,        /* mds->client revoke */
 521         CEPH_CAP_OP_TRUNC,         /* mds->client trunc notify */
 522         CEPH_CAP_OP_EXPORT,        /* mds has exported the cap */
 523         CEPH_CAP_OP_IMPORT,        /* mds has imported the cap */
 524         CEPH_CAP_OP_UPDATE,        /* client->mds update */
 525         CEPH_CAP_OP_DROP,          /* client->mds drop cap bits */
 526         CEPH_CAP_OP_FLUSH,         /* client->mds cap writeback */
 527         CEPH_CAP_OP_FLUSH_ACK,     /* mds->client flushed */
 528         CEPH_CAP_OP_FLUSHSNAP,     /* client->mds flush snapped metadata */
 529         CEPH_CAP_OP_FLUSHSNAP_ACK, /* mds->client flushed snapped metadata */
 530         CEPH_CAP_OP_RELEASE,       /* client->mds release (clean) cap */
 531         CEPH_CAP_OP_RENEW,         /* client->mds renewal request */
 532 };
 533
 534 extern const char *ceph_cap_op_name(int op);
 535
 536 /*
 537  * caps message, used for capability callbacks, acks, requests, etc.
 538  */
 539 struct ceph_mds_caps {
 540         __le32 op;                  /* CEPH_CAP_OP_* */
 541         __le64 ino, realm;
 542         __le64 cap_id;
 543         __le32 seq, issue_seq;
 544         __le32 caps, wanted, dirty; /* latest issued/wanted/dirty */
 545         __le32 migrate_seq;
 546         __le64 snap_follows;
 547         __le32 snap_trace_len;
 548
 549         /* authlock */
 550         __le32 uid, gid, mode;
 551
 552         /* linklock */
 553         __le32 nlink;
 554
 555         /* xattrlock */
 556         __le32 xattr_len;
 557         __le64 xattr_version;
 558
 559         /* filelock */
 560         __le64 size, max_size, truncate_size;
 561         __le32 truncate_seq;
 562         struct ceph_timespec mtime, atime, ctime;
 563         struct ceph_file_layout layout;
 564         __le32 time_warp_seq;
 565 } __attribute__ ((packed));
 566
 567 /* cap release msg head */
 568 struct ceph_mds_cap_release {
 569         __le32 num;                /* number of cap_items that follow */
 570 } __attribute__ ((packed));
 571
 572 struct ceph_mds_cap_item {
 573         __le64 ino;
 574         __le64 cap_id;
 575         __le32 migrate_seq, seq;
 576 } __attribute__ ((packed));
 577
 578 #define CEPH_MDS_LEASE_REVOKE           1  /*    mds  -> client */
 579 #define CEPH_MDS_LEASE_RELEASE          2  /* client  -> mds    */
 580 #define CEPH_MDS_LEASE_RENEW            3  /* client <-> mds    */
 581 #define CEPH_MDS_LEASE_REVOKE_ACK       4  /* client  -> mds    */
 582
 583 extern const char *ceph_lease_op_name(int o);
 584
 585 /* lease msg header */
 586 struct ceph_mds_lease {
 587         __u8 action;            /* CEPH_MDS_LEASE_* */
 588         __le16 mask;            /* which lease */
 589         __le64 ino;
 590         __le64 first, last;     /* snap range */
 591         __le32 seq;
 592         __le32 duration_ms;     /* duration of renewal */
 593 } __attribute__ ((packed));
 594 /* followed by a __le32+string for dname */
 595
 596 /* client reconnect */
 597 struct ceph_mds_cap_reconnect {
 598         __le64 cap_id;
 599         __le32 wanted;
 600         __le32 issued;
 601         __le64 size;
 602         struct ceph_timespec mtime, atime;
 603         __le64 snaprealm;
 604         __le64 pathbase;        /* base ino for our path to this ino */
 605 } __attribute__ ((packed));
 606 /* followed by encoded string */
 607
 608 struct ceph_mds_snaprealm_reconnect {
 609         __le64 ino;     /* snap realm base */
 610         __le64 seq;     /* snap seq for this snap realm */
 611         __le64 parent;  /* parent realm */
 612 } __attribute__ ((packed));
 613
 614 /*
 615  * snaps
 616  */
 617 enum {
 618         CEPH_SNAP_OP_UPDATE,  /* CREATE or DESTROY */
 619         CEPH_SNAP_OP_CREATE,
 620         CEPH_SNAP_OP_DESTROY,
 621         CEPH_SNAP_OP_SPLIT,
 622 };
 623
 624 extern const char *ceph_snap_op_name(int o);
 625
 626 /* snap msg header */
 627 struct ceph_mds_snap_head {
 628         __le32 op;                /* CEPH_SNAP_OP_* */
 629         __le64 split;             /* ino to split off, if any */
 630         __le32 num_split_inos;    /* # inos belonging to new child realm */
 631         __le32 num_split_realms;  /* # child realms udner new child realm */
 632         __le32 trace_len;         /* size of snap trace blob */
 633 } __attribute__ ((packed));
 634 /* followed by split ino list, then split realms, then the trace blob */
 635
 636 /*
 637  * encode info about a snaprealm, as viewed by a client
 638  */
 639 struct ceph_mds_snap_realm {
 640         __le64 ino;           /* ino */
 641         __le64 created;       /* snap: when created */
 642         __le64 parent;        /* ino: parent realm */
 643         __le64 parent_since;  /* snap: same parent since */
 644         __le64 seq;           /* snap: version */
 645         __le32 num_snaps;
 646         __le32 num_prior_parent_snaps;
 647 } __attribute__ ((packed));
 648 /* followed by my snap list, then prior parent snap list */
 649
 650 #endif