2 * ceph_fs.h - Ceph constants and data types to share between kernel and
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.
19 * subprotocol versions. when specific messages types or high-level
20 * protocols change, bump the affected components. we keep rev
21 * internal cluster protocols separately from the public,
22 * client-facing protocol.
24 #define CEPH_OSD_PROTOCOL 8 /* cluster internal */
25 #define CEPH_MDS_PROTOCOL 12 /* cluster internal */
26 #define CEPH_MON_PROTOCOL 5 /* cluster internal */
27 #define CEPH_OSDC_PROTOCOL 24 /* server/client */
28 #define CEPH_MDSC_PROTOCOL 32 /* server/client */
29 #define CEPH_MONC_PROTOCOL 15 /* server/client */
32 #define CEPH_INO_ROOT 1
33 #define CEPH_INO_CEPH 2 /* hidden .ceph dir */
35 /* arbitrary limit on max # of monitors (cluster of 3 is typical) */
36 #define CEPH_MAX_MON 31
42 #define CEPH_FEATURE_UID (1<<0)
43 #define CEPH_FEATURE_NOSRCADDR (1<<1)
44 #define CEPH_FEATURE_MONCLOCKCHECK (1<<2)
45 #define CEPH_FEATURE_FLOCK (1<<3)
49 * ceph_file_layout - describe data layout for a file/inode
51 struct ceph_file_layout {
52 /* file -> object mapping */
53 __le32 fl_stripe_unit; /* stripe unit, in bytes. must be multiple
55 __le32 fl_stripe_count; /* over this many objects */
56 __le32 fl_object_size; /* until objects are this big, then move to
58 __le32 fl_cas_hash; /* 0 = none; 1 = sha256 */
60 /* pg -> disk layout */
61 __le32 fl_object_stripe_unit; /* for per-object parity, if any */
63 /* object -> pg layout */
64 __le32 fl_pg_preferred; /* preferred primary for pg (-1 for none) */
65 __le32 fl_pg_pool; /* namespace, crush ruleset, rep level */
66 } __attribute__ ((packed));
68 #define CEPH_MIN_STRIPE_UNIT 65536
70 int ceph_file_layout_is_valid(const struct ceph_file_layout *layout);
73 /* crypto algorithms */
74 #define CEPH_CRYPTO_NONE 0x0
75 #define CEPH_CRYPTO_AES 0x1
77 /* security/authentication protocols */
78 #define CEPH_AUTH_UNKNOWN 0x0
79 #define CEPH_AUTH_NONE 0x1
80 #define CEPH_AUTH_CEPHX 0x2
82 #define CEPH_AUTH_UID_DEFAULT ((__u64) -1)
85 /*********************************************
94 #define CEPH_MSG_SHUTDOWN 1
95 #define CEPH_MSG_PING 2
97 /* client <-> monitor */
98 #define CEPH_MSG_MON_MAP 4
99 #define CEPH_MSG_MON_GET_MAP 5
100 #define CEPH_MSG_STATFS 13
101 #define CEPH_MSG_STATFS_REPLY 14
102 #define CEPH_MSG_MON_SUBSCRIBE 15
103 #define CEPH_MSG_MON_SUBSCRIBE_ACK 16
104 #define CEPH_MSG_AUTH 17
105 #define CEPH_MSG_AUTH_REPLY 18
108 #define CEPH_MSG_MDS_MAP 21
110 #define CEPH_MSG_CLIENT_SESSION 22
111 #define CEPH_MSG_CLIENT_RECONNECT 23
113 #define CEPH_MSG_CLIENT_REQUEST 24
114 #define CEPH_MSG_CLIENT_REQUEST_FORWARD 25
115 #define CEPH_MSG_CLIENT_REPLY 26
116 #define CEPH_MSG_CLIENT_CAPS 0x310
117 #define CEPH_MSG_CLIENT_LEASE 0x311
118 #define CEPH_MSG_CLIENT_SNAP 0x312
119 #define CEPH_MSG_CLIENT_CAPRELEASE 0x313
122 #define CEPH_MSG_POOLOP_REPLY 48
123 #define CEPH_MSG_POOLOP 49
127 #define CEPH_MSG_OSD_MAP 41
128 #define CEPH_MSG_OSD_OP 42
129 #define CEPH_MSG_OSD_OPREPLY 43
131 /* pool operations */
133 POOL_OP_CREATE = 0x01,
134 POOL_OP_DELETE = 0x02,
135 POOL_OP_AUID_CHANGE = 0x03,
136 POOL_OP_CREATE_SNAP = 0x11,
137 POOL_OP_DELETE_SNAP = 0x12,
138 POOL_OP_CREATE_UNMANAGED_SNAP = 0x21,
139 POOL_OP_DELETE_UNMANAGED_SNAP = 0x22,
142 struct ceph_mon_request_header {
145 __le64 session_mon_tid;
146 } __attribute__ ((packed));
148 struct ceph_mon_statfs {
149 struct ceph_mon_request_header monhdr;
150 struct ceph_fsid fsid;
151 } __attribute__ ((packed));
154 __le64 kb, kb_used, kb_avail;
156 } __attribute__ ((packed));
158 struct ceph_mon_statfs_reply {
159 struct ceph_fsid fsid;
161 struct ceph_statfs st;
162 } __attribute__ ((packed));
164 const char *ceph_pool_op_name(int op);
166 struct ceph_mon_poolop {
167 struct ceph_mon_request_header monhdr;
168 struct ceph_fsid fsid;
174 } __attribute__ ((packed));
176 struct ceph_mon_poolop_reply {
177 struct ceph_mon_request_header monhdr;
178 struct ceph_fsid fsid;
183 } __attribute__ ((packed));
185 struct ceph_mon_unmanaged_snap {
187 } __attribute__ ((packed));
189 struct ceph_osd_getmap {
190 struct ceph_mon_request_header monhdr;
191 struct ceph_fsid fsid;
193 } __attribute__ ((packed));
195 struct ceph_mds_getmap {
196 struct ceph_mon_request_header monhdr;
197 struct ceph_fsid fsid;
198 } __attribute__ ((packed));
200 struct ceph_client_mount {
201 struct ceph_mon_request_header monhdr;
202 } __attribute__ ((packed));
204 struct ceph_mon_subscribe_item {
205 __le64 have_version; __le64 have;
207 } __attribute__ ((packed));
209 struct ceph_mon_subscribe_ack {
210 __le32 duration; /* seconds */
211 struct ceph_fsid fsid;
212 } __attribute__ ((packed));
219 #define CEPH_MDS_STATE_DNE 0 /* down, does not exist. */
220 #define CEPH_MDS_STATE_STOPPED -1 /* down, once existed, but no subtrees.
222 #define CEPH_MDS_STATE_BOOT -4 /* up, boot announcement. */
223 #define CEPH_MDS_STATE_STANDBY -5 /* up, idle. waiting for assignment. */
224 #define CEPH_MDS_STATE_CREATING -6 /* up, creating MDS instance. */
225 #define CEPH_MDS_STATE_STARTING -7 /* up, starting previously stopped mds */
226 #define CEPH_MDS_STATE_STANDBY_REPLAY -8 /* up, tailing active node's journal */
228 #define CEPH_MDS_STATE_REPLAY 8 /* up, replaying journal. */
229 #define CEPH_MDS_STATE_RESOLVE 9 /* up, disambiguating distributed
230 operations (import, rename, etc.) */
231 #define CEPH_MDS_STATE_RECONNECT 10 /* up, reconnect to clients */
232 #define CEPH_MDS_STATE_REJOIN 11 /* up, rejoining distributed cache */
233 #define CEPH_MDS_STATE_CLIENTREPLAY 12 /* up, replaying client operations */
234 #define CEPH_MDS_STATE_ACTIVE 13 /* up, active */
235 #define CEPH_MDS_STATE_STOPPING 14 /* up, but exporting metadata */
237 extern const char *ceph_mds_state_name(int s);
241 * metadata lock types.
242 * - these are bitmasks.. we can compose them
243 * - they also define the lock ordering by the MDS
244 * - a few of these are internal to the mds
246 #define CEPH_LOCK_DVERSION 1
247 #define CEPH_LOCK_DN 2
248 #define CEPH_LOCK_ISNAP 16
249 #define CEPH_LOCK_IVERSION 32 /* mds internal */
250 #define CEPH_LOCK_IFILE 64
251 #define CEPH_LOCK_IAUTH 128
252 #define CEPH_LOCK_ILINK 256
253 #define CEPH_LOCK_IDFT 512 /* dir frag tree */
254 #define CEPH_LOCK_INEST 1024 /* mds internal */
255 #define CEPH_LOCK_IXATTR 2048
256 #define CEPH_LOCK_INO 8192 /* immutable inode bits; not a lock */
258 /* client_session ops */
260 CEPH_SESSION_REQUEST_OPEN,
262 CEPH_SESSION_REQUEST_CLOSE,
264 CEPH_SESSION_REQUEST_RENEWCAPS,
265 CEPH_SESSION_RENEWCAPS,
267 CEPH_SESSION_RECALL_STATE,
270 extern const char *ceph_session_op_name(int op);
272 struct ceph_mds_session_head {
275 struct ceph_timespec stamp;
276 __le32 max_caps, max_leases;
277 } __attribute__ ((packed));
282 * & 0x001000 -> write op
283 * & 0x010000 -> follow symlink (e.g. stat(), not lstat()).
284 & & 0x100000 -> use weird ino/path trace
286 #define CEPH_MDS_OP_WRITE 0x001000
288 CEPH_MDS_OP_LOOKUP = 0x00100,
289 CEPH_MDS_OP_GETATTR = 0x00101,
290 CEPH_MDS_OP_LOOKUPHASH = 0x00102,
291 CEPH_MDS_OP_LOOKUPPARENT = 0x00103,
293 CEPH_MDS_OP_SETXATTR = 0x01105,
294 CEPH_MDS_OP_RMXATTR = 0x01106,
295 CEPH_MDS_OP_SETLAYOUT = 0x01107,
296 CEPH_MDS_OP_SETATTR = 0x01108,
298 CEPH_MDS_OP_MKNOD = 0x01201,
299 CEPH_MDS_OP_LINK = 0x01202,
300 CEPH_MDS_OP_UNLINK = 0x01203,
301 CEPH_MDS_OP_RENAME = 0x01204,
302 CEPH_MDS_OP_MKDIR = 0x01220,
303 CEPH_MDS_OP_RMDIR = 0x01221,
304 CEPH_MDS_OP_SYMLINK = 0x01222,
306 CEPH_MDS_OP_CREATE = 0x01301,
307 CEPH_MDS_OP_OPEN = 0x00302,
308 CEPH_MDS_OP_READDIR = 0x00305,
310 CEPH_MDS_OP_LOOKUPSNAP = 0x00400,
311 CEPH_MDS_OP_MKSNAP = 0x01400,
312 CEPH_MDS_OP_RMSNAP = 0x01401,
313 CEPH_MDS_OP_LSSNAP = 0x00402,
316 extern const char *ceph_mds_op_name(int op);
319 #define CEPH_SETATTR_MODE 1
320 #define CEPH_SETATTR_UID 2
321 #define CEPH_SETATTR_GID 4
322 #define CEPH_SETATTR_MTIME 8
323 #define CEPH_SETATTR_ATIME 16
324 #define CEPH_SETATTR_SIZE 32
325 #define CEPH_SETATTR_CTIME 64
327 union ceph_mds_request_args {
329 __le32 mask; /* CEPH_CAP_* */
330 } __attribute__ ((packed)) getattr;
335 struct ceph_timespec mtime;
336 struct ceph_timespec atime;
337 __le64 size, old_size; /* old_size needed by truncate */
338 __le32 mask; /* CEPH_SETATTR_* */
339 } __attribute__ ((packed)) setattr;
341 __le32 frag; /* which dir fragment */
342 __le32 max_entries; /* how many dentries to grab */
344 } __attribute__ ((packed)) readdir;
348 } __attribute__ ((packed)) mknod;
351 } __attribute__ ((packed)) mkdir;
355 __le32 stripe_unit; /* layout for newly created file */
356 __le32 stripe_count; /* ... */
358 __le32 file_replication;
360 } __attribute__ ((packed)) open;
363 } __attribute__ ((packed)) setxattr;
365 struct ceph_file_layout layout;
366 } __attribute__ ((packed)) setlayout;
367 } __attribute__ ((packed));
369 #define CEPH_MDS_FLAG_REPLAY 1 /* this is a replayed op */
370 #define CEPH_MDS_FLAG_WANT_DENTRY 2 /* want dentry in reply */
372 struct ceph_mds_request_head {
373 __le64 oldest_client_tid;
374 __le32 mdsmap_epoch; /* on client */
375 __le32 flags; /* CEPH_MDS_FLAG_* */
376 __u8 num_retry, num_fwd; /* count retry, fwd attempts */
377 __le16 num_releases; /* # include cap/lease release records */
378 __le32 op; /* mds op code */
379 __le32 caller_uid, caller_gid;
380 __le64 ino; /* use this ino for openc, mkdir, mknod,
381 etc. (if replaying) */
382 union ceph_mds_request_args args;
383 } __attribute__ ((packed));
385 /* cap/lease release record */
386 struct ceph_mds_request_release {
387 __le64 ino, cap_id; /* ino and unique cap id */
388 __le32 caps, wanted; /* new issued, wanted */
389 __le32 seq, issue_seq, mseq;
390 __le32 dname_seq; /* if releasing a dentry lease, a */
391 __le32 dname_len; /* string follows. */
392 } __attribute__ ((packed));
395 struct ceph_mds_reply_head {
399 __u8 safe; /* true if committed to disk */
400 __u8 is_dentry, is_target; /* true if dentry, target inode records
401 are included with reply */
402 } __attribute__ ((packed));
404 /* one for each node split */
405 struct ceph_frag_tree_split {
406 __le32 frag; /* this frag splits... */
407 __le32 by; /* ...by this many bits */
408 } __attribute__ ((packed));
410 struct ceph_frag_tree_head {
411 __le32 nsplits; /* num ceph_frag_tree_split records */
412 struct ceph_frag_tree_split splits[];
413 } __attribute__ ((packed));
415 /* capability issue, for bundling with mds reply */
416 struct ceph_mds_reply_cap {
417 __le32 caps, wanted; /* caps issued, wanted */
420 __le64 realm; /* snap realm */
421 __u8 flags; /* CEPH_CAP_FLAG_* */
422 } __attribute__ ((packed));
424 #define CEPH_CAP_FLAG_AUTH 1 /* cap is issued by auth mds */
426 /* inode record, for bundling with mds reply */
427 struct ceph_mds_reply_inode {
431 __le64 version; /* inode version */
432 __le64 xattr_version; /* version for xattr blob */
433 struct ceph_mds_reply_cap cap; /* caps issued for this inode */
434 struct ceph_file_layout layout;
435 struct ceph_timespec ctime, mtime, atime;
436 __le32 time_warp_seq;
437 __le64 size, max_size, truncate_size;
439 __le32 mode, uid, gid;
441 __le64 files, subdirs, rbytes, rfiles, rsubdirs; /* dir stats */
442 struct ceph_timespec rctime;
443 struct ceph_frag_tree_head fragtree; /* (must be at end of struct) */
444 } __attribute__ ((packed));
445 /* followed by frag array, then symlink string, then xattr blob */
447 /* reply_lease follows dname, and reply_inode */
448 struct ceph_mds_reply_lease {
449 __le16 mask; /* lease type(s) */
450 __le32 duration_ms; /* lease duration */
452 } __attribute__ ((packed));
454 struct ceph_mds_reply_dirfrag {
455 __le32 frag; /* fragment */
456 __le32 auth; /* auth mds, if this is a delegation point */
457 __le32 ndist; /* number of mds' this is replicated on */
459 } __attribute__ ((packed));
461 /* file access modes */
462 #define CEPH_FILE_MODE_PIN 0
463 #define CEPH_FILE_MODE_RD 1
464 #define CEPH_FILE_MODE_WR 2
465 #define CEPH_FILE_MODE_RDWR 3 /* RD | WR */
466 #define CEPH_FILE_MODE_LAZY 4 /* lazy io */
467 #define CEPH_FILE_MODE_NUM 8 /* bc these are bit fields.. mostly */
469 int ceph_flags_to_mode(int flags);
472 /* capability bits */
473 #define CEPH_CAP_PIN 1 /* no specific capabilities beyond the pin */
475 /* generic cap bits */
476 #define CEPH_CAP_GSHARED 1 /* client can reads */
477 #define CEPH_CAP_GEXCL 2 /* client can read and update */
478 #define CEPH_CAP_GCACHE 4 /* (file) client can cache reads */
479 #define CEPH_CAP_GRD 8 /* (file) client can read */
480 #define CEPH_CAP_GWR 16 /* (file) client can write */
481 #define CEPH_CAP_GBUFFER 32 /* (file) client can buffer writes */
482 #define CEPH_CAP_GWREXTEND 64 /* (file) client can extend EOF */
483 #define CEPH_CAP_GLAZYIO 128 /* (file) client can perform lazy io */
486 #define CEPH_CAP_SAUTH 2
487 #define CEPH_CAP_SLINK 4
488 #define CEPH_CAP_SXATTR 6
489 #define CEPH_CAP_SFILE 8 /* goes at the end (uses >2 cap bits) */
491 #define CEPH_CAP_BITS 16
493 /* composed values */
494 #define CEPH_CAP_AUTH_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SAUTH)
495 #define CEPH_CAP_AUTH_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SAUTH)
496 #define CEPH_CAP_LINK_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SLINK)
497 #define CEPH_CAP_LINK_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SLINK)
498 #define CEPH_CAP_XATTR_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SXATTR)
499 #define CEPH_CAP_XATTR_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SXATTR)
500 #define CEPH_CAP_FILE(x) (x << CEPH_CAP_SFILE)
501 #define CEPH_CAP_FILE_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SFILE)
502 #define CEPH_CAP_FILE_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SFILE)
503 #define CEPH_CAP_FILE_CACHE (CEPH_CAP_GCACHE << CEPH_CAP_SFILE)
504 #define CEPH_CAP_FILE_RD (CEPH_CAP_GRD << CEPH_CAP_SFILE)
505 #define CEPH_CAP_FILE_WR (CEPH_CAP_GWR << CEPH_CAP_SFILE)
506 #define CEPH_CAP_FILE_BUFFER (CEPH_CAP_GBUFFER << CEPH_CAP_SFILE)
507 #define CEPH_CAP_FILE_WREXTEND (CEPH_CAP_GWREXTEND << CEPH_CAP_SFILE)
508 #define CEPH_CAP_FILE_LAZYIO (CEPH_CAP_GLAZYIO << CEPH_CAP_SFILE)
510 /* cap masks (for getattr) */
511 #define CEPH_STAT_CAP_INODE CEPH_CAP_PIN
512 #define CEPH_STAT_CAP_TYPE CEPH_CAP_PIN /* mode >> 12 */
513 #define CEPH_STAT_CAP_SYMLINK CEPH_CAP_PIN
514 #define CEPH_STAT_CAP_UID CEPH_CAP_AUTH_SHARED
515 #define CEPH_STAT_CAP_GID CEPH_CAP_AUTH_SHARED
516 #define CEPH_STAT_CAP_MODE CEPH_CAP_AUTH_SHARED
517 #define CEPH_STAT_CAP_NLINK CEPH_CAP_LINK_SHARED
518 #define CEPH_STAT_CAP_LAYOUT CEPH_CAP_FILE_SHARED
519 #define CEPH_STAT_CAP_MTIME CEPH_CAP_FILE_SHARED
520 #define CEPH_STAT_CAP_SIZE CEPH_CAP_FILE_SHARED
521 #define CEPH_STAT_CAP_ATIME CEPH_CAP_FILE_SHARED /* fixme */
522 #define CEPH_STAT_CAP_XATTR CEPH_CAP_XATTR_SHARED
523 #define CEPH_STAT_CAP_INODE_ALL (CEPH_CAP_PIN | \
524 CEPH_CAP_AUTH_SHARED | \
525 CEPH_CAP_LINK_SHARED | \
526 CEPH_CAP_FILE_SHARED | \
527 CEPH_CAP_XATTR_SHARED)
529 #define CEPH_CAP_ANY_SHARED (CEPH_CAP_AUTH_SHARED | \
530 CEPH_CAP_LINK_SHARED | \
531 CEPH_CAP_XATTR_SHARED | \
532 CEPH_CAP_FILE_SHARED)
533 #define CEPH_CAP_ANY_RD (CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_RD | \
536 #define CEPH_CAP_ANY_EXCL (CEPH_CAP_AUTH_EXCL | \
537 CEPH_CAP_LINK_EXCL | \
538 CEPH_CAP_XATTR_EXCL | \
540 #define CEPH_CAP_ANY_FILE_WR (CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER | \
542 #define CEPH_CAP_ANY_WR (CEPH_CAP_ANY_EXCL | CEPH_CAP_ANY_FILE_WR)
543 #define CEPH_CAP_ANY (CEPH_CAP_ANY_RD | CEPH_CAP_ANY_EXCL | \
544 CEPH_CAP_ANY_FILE_WR | CEPH_CAP_FILE_LAZYIO | \
547 #define CEPH_CAP_LOCKS (CEPH_LOCK_IFILE | CEPH_LOCK_IAUTH | CEPH_LOCK_ILINK | \
550 int ceph_caps_for_mode(int mode);
553 CEPH_CAP_OP_GRANT, /* mds->client grant */
554 CEPH_CAP_OP_REVOKE, /* mds->client revoke */
555 CEPH_CAP_OP_TRUNC, /* mds->client trunc notify */
556 CEPH_CAP_OP_EXPORT, /* mds has exported the cap */
557 CEPH_CAP_OP_IMPORT, /* mds has imported the cap */
558 CEPH_CAP_OP_UPDATE, /* client->mds update */
559 CEPH_CAP_OP_DROP, /* client->mds drop cap bits */
560 CEPH_CAP_OP_FLUSH, /* client->mds cap writeback */
561 CEPH_CAP_OP_FLUSH_ACK, /* mds->client flushed */
562 CEPH_CAP_OP_FLUSHSNAP, /* client->mds flush snapped metadata */
563 CEPH_CAP_OP_FLUSHSNAP_ACK, /* mds->client flushed snapped metadata */
564 CEPH_CAP_OP_RELEASE, /* client->mds release (clean) cap */
565 CEPH_CAP_OP_RENEW, /* client->mds renewal request */
568 extern const char *ceph_cap_op_name(int op);
571 * caps message, used for capability callbacks, acks, requests, etc.
573 struct ceph_mds_caps {
574 __le32 op; /* CEPH_CAP_OP_* */
577 __le32 seq, issue_seq;
578 __le32 caps, wanted, dirty; /* latest issued/wanted/dirty */
581 __le32 snap_trace_len;
584 __le32 uid, gid, mode;
591 __le64 xattr_version;
594 __le64 size, max_size, truncate_size;
596 struct ceph_timespec mtime, atime, ctime;
597 struct ceph_file_layout layout;
598 __le32 time_warp_seq;
599 } __attribute__ ((packed));
601 /* cap release msg head */
602 struct ceph_mds_cap_release {
603 __le32 num; /* number of cap_items that follow */
604 } __attribute__ ((packed));
606 struct ceph_mds_cap_item {
609 __le32 migrate_seq, seq;
610 } __attribute__ ((packed));
612 #define CEPH_MDS_LEASE_REVOKE 1 /* mds -> client */
613 #define CEPH_MDS_LEASE_RELEASE 2 /* client -> mds */
614 #define CEPH_MDS_LEASE_RENEW 3 /* client <-> mds */
615 #define CEPH_MDS_LEASE_REVOKE_ACK 4 /* client -> mds */
617 extern const char *ceph_lease_op_name(int o);
619 /* lease msg header */
620 struct ceph_mds_lease {
621 __u8 action; /* CEPH_MDS_LEASE_* */
622 __le16 mask; /* which lease */
624 __le64 first, last; /* snap range */
626 __le32 duration_ms; /* duration of renewal */
627 } __attribute__ ((packed));
628 /* followed by a __le32+string for dname */
630 /* client reconnect */
631 struct ceph_mds_cap_reconnect {
636 struct ceph_timespec mtime, atime;
638 __le64 pathbase; /* base ino for our path to this ino */
639 } __attribute__ ((packed));
640 /* followed by encoded string */
642 struct ceph_mds_snaprealm_reconnect {
643 __le64 ino; /* snap realm base */
644 __le64 seq; /* snap seq for this snap realm */
645 __le64 parent; /* parent realm */
646 } __attribute__ ((packed));
652 CEPH_SNAP_OP_UPDATE, /* CREATE or DESTROY */
654 CEPH_SNAP_OP_DESTROY,
658 extern const char *ceph_snap_op_name(int o);
660 /* snap msg header */
661 struct ceph_mds_snap_head {
662 __le32 op; /* CEPH_SNAP_OP_* */
663 __le64 split; /* ino to split off, if any */
664 __le32 num_split_inos; /* # inos belonging to new child realm */
665 __le32 num_split_realms; /* # child realms udner new child realm */
666 __le32 trace_len; /* size of snap trace blob */
667 } __attribute__ ((packed));
668 /* followed by split ino list, then split realms, then the trace blob */
671 * encode info about a snaprealm, as viewed by a client
673 struct ceph_mds_snap_realm {
674 __le64 ino; /* ino */
675 __le64 created; /* snap: when created */
676 __le64 parent; /* ino: parent realm */
677 __le64 parent_since; /* snap: same parent since */
678 __le64 seq; /* snap: version */
680 __le32 num_prior_parent_snaps;
681 } __attribute__ ((packed));
682 /* followed by my snap list, then prior parent snap list */