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.
12 #ifndef _FS_CEPH_CEPH_FS_H
13 #define _FS_CEPH_CEPH_FS_H
19 * Ceph release version
21 #define CEPH_VERSION_MAJOR 0
22 #define CEPH_VERSION_MINOR 17
23 #define CEPH_VERSION_PATCH 0
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) \
29 #define CEPH_VERSION CEPH_MAKE_VERSION(CEPH_VERSION_MAJOR, \
30 CEPH_VERSION_MINOR, CEPH_VERSION_PATCH)
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.
38 #define CEPH_OSD_PROTOCOL 7 /* cluster internal */
39 #define CEPH_MDS_PROTOCOL 9 /* cluster internal */
40 #define CEPH_MON_PROTOCOL 5 /* cluster internal */
41 #define CEPH_OSDC_PROTOCOL 22 /* server/client */
42 #define CEPH_MDSC_PROTOCOL 29 /* server/client */
43 #define CEPH_MONC_PROTOCOL 15 /* server/client */
46 #define CEPH_INO_ROOT 1
48 /* arbitrary limit on max # of monitors (cluster of 3 is typical) */
49 #define CEPH_MAX_MON 31
54 * ceph_file_layout - describe data layout for a file/inode
56 struct ceph_file_layout {
57 /* file -> object mapping */
58 __le32 fl_stripe_unit; /* stripe unit, in bytes. must be multiple
60 __le32 fl_stripe_count; /* over this many objects */
61 __le32 fl_object_size; /* until objects are this big, then move to
63 __le32 fl_cas_hash; /* 0 = none; 1 = sha256 */
65 /* pg -> disk layout */
66 __le32 fl_object_stripe_unit; /* for per-object parity, if any */
68 /* object -> pg layout */
69 __le32 fl_pg_preferred; /* preferred primary for pg (-1 for none) */
70 __le32 fl_pg_pool; /* namespace, crush ruleset, rep level */
71 } __attribute__ ((packed));
73 #define CEPH_MIN_STRIPE_UNIT 65536
75 int ceph_file_layout_is_valid(const struct ceph_file_layout *layout);
78 /*********************************************
87 #define CEPH_MSG_SHUTDOWN 1
88 #define CEPH_MSG_PING 2
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
101 #define CEPH_MSG_MDS_MAP 21
103 #define CEPH_MSG_CLIENT_SESSION 22
104 #define CEPH_MSG_CLIENT_RECONNECT 23
106 #define CEPH_MSG_CLIENT_REQUEST 24
107 #define CEPH_MSG_CLIENT_REQUEST_FORWARD 25
108 #define CEPH_MSG_CLIENT_REPLY 26
109 #define CEPH_MSG_CLIENT_CAPS 0x310
110 #define CEPH_MSG_CLIENT_LEASE 0x311
111 #define CEPH_MSG_CLIENT_SNAP 0x312
112 #define CEPH_MSG_CLIENT_CAPRELEASE 0x313
115 #define CEPH_MSG_OSD_MAP 41
116 #define CEPH_MSG_OSD_OP 42
117 #define CEPH_MSG_OSD_OPREPLY 43
119 struct ceph_mon_request_header {
122 __le64 session_mon_tid;
123 } __attribute__ ((packed));
125 struct ceph_mon_statfs {
126 struct ceph_mon_request_header monhdr;
127 struct ceph_fsid fsid;
129 } __attribute__ ((packed));
132 __le64 kb, kb_used, kb_avail;
134 } __attribute__ ((packed));
136 struct ceph_mon_statfs_reply {
137 struct ceph_fsid fsid;
140 struct ceph_statfs st;
141 } __attribute__ ((packed));
143 struct ceph_osd_getmap {
144 struct ceph_mon_request_header monhdr;
145 struct ceph_fsid fsid;
147 } __attribute__ ((packed));
149 struct ceph_mds_getmap {
150 struct ceph_mon_request_header monhdr;
151 struct ceph_fsid fsid;
152 } __attribute__ ((packed));
154 struct ceph_client_mount {
155 struct ceph_mon_request_header monhdr;
156 } __attribute__ ((packed));
158 struct ceph_mon_subscribe_item {
159 __le64 have_version; __le64 have;
161 } __attribute__ ((packed));
163 struct ceph_mon_subscribe_ack {
164 __le32 duration; /* seconds */
165 struct ceph_fsid fsid;
166 } __attribute__ ((packed));
173 #define CEPH_MDS_STATE_DNE 0 /* down, does not exist. */
174 #define CEPH_MDS_STATE_STOPPED -1 /* down, once existed, but no subtrees.
176 #define CEPH_MDS_STATE_BOOT -4 /* up, boot announcement. */
177 #define CEPH_MDS_STATE_STANDBY -5 /* up, idle. waiting for assignment. */
178 #define CEPH_MDS_STATE_CREATING -6 /* up, creating MDS instance. */
179 #define CEPH_MDS_STATE_STARTING -7 /* up, starting previously stopped mds */
180 #define CEPH_MDS_STATE_STANDBY_REPLAY -8 /* up, tailing active node's journal */
182 #define CEPH_MDS_STATE_REPLAY 8 /* up, replaying journal. */
183 #define CEPH_MDS_STATE_RESOLVE 9 /* up, disambiguating distributed
184 operations (import, rename, etc.) */
185 #define CEPH_MDS_STATE_RECONNECT 10 /* up, reconnect to clients */
186 #define CEPH_MDS_STATE_REJOIN 11 /* up, rejoining distributed cache */
187 #define CEPH_MDS_STATE_CLIENTREPLAY 12 /* up, replaying client operations */
188 #define CEPH_MDS_STATE_ACTIVE 13 /* up, active */
189 #define CEPH_MDS_STATE_STOPPING 14 /* up, but exporting metadata */
191 extern const char *ceph_mds_state_name(int s);
195 * metadata lock types.
196 * - these are bitmasks.. we can compose them
197 * - they also define the lock ordering by the MDS
198 * - a few of these are internal to the mds
200 #define CEPH_LOCK_DN 1
201 #define CEPH_LOCK_ISNAP 2
202 #define CEPH_LOCK_IVERSION 4 /* mds internal */
203 #define CEPH_LOCK_IFILE 8 /* mds internal */
204 #define CEPH_LOCK_IAUTH 32
205 #define CEPH_LOCK_ILINK 64
206 #define CEPH_LOCK_IDFT 128 /* dir frag tree */
207 #define CEPH_LOCK_INEST 256 /* mds internal */
208 #define CEPH_LOCK_IXATTR 512
209 #define CEPH_LOCK_INO 2048 /* immutable inode bits; not a lock */
211 /* client_session ops */
213 CEPH_SESSION_REQUEST_OPEN,
215 CEPH_SESSION_REQUEST_CLOSE,
217 CEPH_SESSION_REQUEST_RENEWCAPS,
218 CEPH_SESSION_RENEWCAPS,
220 CEPH_SESSION_RECALL_STATE,
223 extern const char *ceph_session_op_name(int op);
225 struct ceph_mds_session_head {
228 struct ceph_timespec stamp;
229 __le32 max_caps, max_leases;
230 } __attribute__ ((packed));
235 * & 0x001000 -> write op
236 * & 0x010000 -> follow symlink (e.g. stat(), not lstat()).
237 & & 0x100000 -> use weird ino/path trace
239 #define CEPH_MDS_OP_WRITE 0x001000
241 CEPH_MDS_OP_LOOKUP = 0x00100,
242 CEPH_MDS_OP_GETATTR = 0x00101,
243 CEPH_MDS_OP_LOOKUPHASH = 0x00102,
244 CEPH_MDS_OP_LOOKUPPARENT = 0x00103,
246 CEPH_MDS_OP_SETXATTR = 0x01105,
247 CEPH_MDS_OP_RMXATTR = 0x01106,
248 CEPH_MDS_OP_SETLAYOUT = 0x01107,
249 CEPH_MDS_OP_SETATTR = 0x01108,
251 CEPH_MDS_OP_MKNOD = 0x01201,
252 CEPH_MDS_OP_LINK = 0x01202,
253 CEPH_MDS_OP_UNLINK = 0x01203,
254 CEPH_MDS_OP_RENAME = 0x01204,
255 CEPH_MDS_OP_MKDIR = 0x01220,
256 CEPH_MDS_OP_RMDIR = 0x01221,
257 CEPH_MDS_OP_SYMLINK = 0x01222,
259 CEPH_MDS_OP_CREATE = 0x00301,
260 CEPH_MDS_OP_OPEN = 0x00302,
261 CEPH_MDS_OP_READDIR = 0x00305,
263 CEPH_MDS_OP_LOOKUPSNAP = 0x00400,
264 CEPH_MDS_OP_MKSNAP = 0x01400,
265 CEPH_MDS_OP_RMSNAP = 0x01401,
266 CEPH_MDS_OP_LSSNAP = 0x00402,
269 extern const char *ceph_mds_op_name(int op);
272 #define CEPH_SETATTR_MODE 1
273 #define CEPH_SETATTR_UID 2
274 #define CEPH_SETATTR_GID 4
275 #define CEPH_SETATTR_MTIME 8
276 #define CEPH_SETATTR_ATIME 16
277 #define CEPH_SETATTR_SIZE 32
278 #define CEPH_SETATTR_CTIME 64
280 union ceph_mds_request_args {
282 __le32 mask; /* CEPH_CAP_* */
283 } __attribute__ ((packed)) getattr;
288 struct ceph_timespec mtime;
289 struct ceph_timespec atime;
290 __le64 size, old_size; /* old_size needed by truncate */
291 __le32 mask; /* CEPH_SETATTR_* */
292 } __attribute__ ((packed)) setattr;
294 __le32 frag; /* which dir fragment */
295 __le32 max_entries; /* how many dentries to grab */
296 } __attribute__ ((packed)) readdir;
300 } __attribute__ ((packed)) mknod;
303 } __attribute__ ((packed)) mkdir;
307 __le32 stripe_unit; /* layout for newly created file */
308 __le32 stripe_count; /* ... */
310 __le32 file_replication;
312 } __attribute__ ((packed)) open;
315 } __attribute__ ((packed)) setxattr;
317 struct ceph_file_layout layout;
318 } __attribute__ ((packed)) setlayout;
319 } __attribute__ ((packed));
321 #define CEPH_MDS_FLAG_REPLAY 1 /* this is a replayed op */
322 #define CEPH_MDS_FLAG_WANT_DENTRY 2 /* want dentry in reply */
324 struct ceph_mds_request_head {
325 __le64 tid, oldest_client_tid;
326 __le32 mdsmap_epoch; /* on client */
327 __le32 flags; /* CEPH_MDS_FLAG_* */
328 __u8 num_retry, num_fwd; /* count retry, fwd attempts */
329 __le16 num_releases; /* # include cap/lease release records */
330 __le32 op; /* mds op code */
331 __le32 caller_uid, caller_gid;
332 __le64 ino; /* use this ino for openc, mkdir, mknod,
333 etc. (if replaying) */
334 union ceph_mds_request_args args;
335 } __attribute__ ((packed));
337 /* cap/lease release record */
338 struct ceph_mds_request_release {
339 __le64 ino, cap_id; /* ino and unique cap id */
340 __le32 caps, wanted; /* new issued, wanted */
341 __le32 seq, issue_seq, mseq;
342 __le32 dname_seq; /* if releasing a dentry lease, a */
343 __le32 dname_len; /* string follows. */
344 } __attribute__ ((packed));
347 struct ceph_mds_reply_head {
352 __u8 safe; /* true if committed to disk */
353 __u8 is_dentry, is_target; /* true if dentry, target inode records
354 are included with reply */
355 } __attribute__ ((packed));
357 /* one for each node split */
358 struct ceph_frag_tree_split {
359 __le32 frag; /* this frag splits... */
360 __le32 by; /* ...by this many bits */
361 } __attribute__ ((packed));
363 struct ceph_frag_tree_head {
364 __le32 nsplits; /* num ceph_frag_tree_split records */
365 struct ceph_frag_tree_split splits[];
366 } __attribute__ ((packed));
368 /* capability issue, for bundling with mds reply */
369 struct ceph_mds_reply_cap {
370 __le32 caps, wanted; /* caps issued, wanted */
373 __le64 realm; /* snap realm */
374 __u8 flags; /* CEPH_CAP_FLAG_* */
375 } __attribute__ ((packed));
377 #define CEPH_CAP_FLAG_AUTH 1 /* cap is issued by auth mds */
379 /* inode record, for bundling with mds reply */
380 struct ceph_mds_reply_inode {
384 __le64 version; /* inode version */
385 __le64 xattr_version; /* version for xattr blob */
386 struct ceph_mds_reply_cap cap; /* caps issued for this inode */
387 struct ceph_file_layout layout;
388 struct ceph_timespec ctime, mtime, atime;
389 __le32 time_warp_seq;
390 __le64 size, max_size, truncate_size;
392 __le32 mode, uid, gid;
394 __le64 files, subdirs, rbytes, rfiles, rsubdirs; /* dir stats */
395 struct ceph_timespec rctime;
396 struct ceph_frag_tree_head fragtree; /* (must be at end of struct) */
397 } __attribute__ ((packed));
398 /* followed by frag array, then symlink string, then xattr blob */
400 /* reply_lease follows dname, and reply_inode */
401 struct ceph_mds_reply_lease {
402 __le16 mask; /* lease type(s) */
403 __le32 duration_ms; /* lease duration */
405 } __attribute__ ((packed));
407 struct ceph_mds_reply_dirfrag {
408 __le32 frag; /* fragment */
409 __le32 auth; /* auth mds, if this is a delegation point */
410 __le32 ndist; /* number of mds' this is replicated on */
412 } __attribute__ ((packed));
414 /* file access modes */
415 #define CEPH_FILE_MODE_PIN 0
416 #define CEPH_FILE_MODE_RD 1
417 #define CEPH_FILE_MODE_WR 2
418 #define CEPH_FILE_MODE_RDWR 3 /* RD | WR */
419 #define CEPH_FILE_MODE_LAZY 4 /* lazy io */
420 #define CEPH_FILE_MODE_NUM 8 /* bc these are bit fields.. mostly */
422 int ceph_flags_to_mode(int flags);
425 /* capability bits */
426 #define CEPH_CAP_PIN 1 /* no specific capabilities beyond the pin */
428 /* generic cap bits */
429 #define CEPH_CAP_GSHARED 1 /* client can reads */
430 #define CEPH_CAP_GEXCL 2 /* client can read and update */
431 #define CEPH_CAP_GCACHE 4 /* (file) client can cache reads */
432 #define CEPH_CAP_GRD 8 /* (file) client can read */
433 #define CEPH_CAP_GWR 16 /* (file) client can write */
434 #define CEPH_CAP_GBUFFER 32 /* (file) client can buffer writes */
435 #define CEPH_CAP_GWREXTEND 64 /* (file) client can extend EOF */
436 #define CEPH_CAP_GLAZYIO 128 /* (file) client can perform lazy io */
439 #define CEPH_CAP_SAUTH 2
440 #define CEPH_CAP_SLINK 4
441 #define CEPH_CAP_SXATTR 6
442 #define CEPH_CAP_SFILE 8 /* goes at the end (uses >2 cap bits) */
444 #define CEPH_CAP_BITS 16
446 /* composed values */
447 #define CEPH_CAP_AUTH_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SAUTH)
448 #define CEPH_CAP_AUTH_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SAUTH)
449 #define CEPH_CAP_LINK_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SLINK)
450 #define CEPH_CAP_LINK_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SLINK)
451 #define CEPH_CAP_XATTR_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SXATTR)
452 #define CEPH_CAP_XATTR_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SXATTR)
453 #define CEPH_CAP_FILE(x) (x << CEPH_CAP_SFILE)
454 #define CEPH_CAP_FILE_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SFILE)
455 #define CEPH_CAP_FILE_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SFILE)
456 #define CEPH_CAP_FILE_CACHE (CEPH_CAP_GCACHE << CEPH_CAP_SFILE)
457 #define CEPH_CAP_FILE_RD (CEPH_CAP_GRD << CEPH_CAP_SFILE)
458 #define CEPH_CAP_FILE_WR (CEPH_CAP_GWR << CEPH_CAP_SFILE)
459 #define CEPH_CAP_FILE_BUFFER (CEPH_CAP_GBUFFER << CEPH_CAP_SFILE)
460 #define CEPH_CAP_FILE_WREXTEND (CEPH_CAP_GWREXTEND << CEPH_CAP_SFILE)
461 #define CEPH_CAP_FILE_LAZYIO (CEPH_CAP_GLAZYIO << CEPH_CAP_SFILE)
463 /* cap masks (for getattr) */
464 #define CEPH_STAT_CAP_INODE CEPH_CAP_PIN
465 #define CEPH_STAT_CAP_TYPE CEPH_CAP_PIN /* mode >> 12 */
466 #define CEPH_STAT_CAP_SYMLINK CEPH_CAP_PIN
467 #define CEPH_STAT_CAP_UID CEPH_CAP_AUTH_SHARED
468 #define CEPH_STAT_CAP_GID CEPH_CAP_AUTH_SHARED
469 #define CEPH_STAT_CAP_MODE CEPH_CAP_AUTH_SHARED
470 #define CEPH_STAT_CAP_NLINK CEPH_CAP_LINK_SHARED
471 #define CEPH_STAT_CAP_LAYOUT CEPH_CAP_FILE_SHARED
472 #define CEPH_STAT_CAP_MTIME CEPH_CAP_FILE_SHARED
473 #define CEPH_STAT_CAP_SIZE CEPH_CAP_FILE_SHARED
474 #define CEPH_STAT_CAP_ATIME CEPH_CAP_FILE_SHARED /* fixme */
475 #define CEPH_STAT_CAP_XATTR CEPH_CAP_XATTR_SHARED
476 #define CEPH_STAT_CAP_INODE_ALL (CEPH_CAP_PIN | \
477 CEPH_CAP_AUTH_SHARED | \
478 CEPH_CAP_LINK_SHARED | \
479 CEPH_CAP_FILE_SHARED | \
480 CEPH_CAP_XATTR_SHARED)
482 #define CEPH_CAP_ANY_SHARED (CEPH_CAP_AUTH_SHARED | \
483 CEPH_CAP_LINK_SHARED | \
484 CEPH_CAP_XATTR_SHARED | \
485 CEPH_CAP_FILE_SHARED)
486 #define CEPH_CAP_ANY_RD (CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_RD | \
489 #define CEPH_CAP_ANY_EXCL (CEPH_CAP_AUTH_EXCL | \
490 CEPH_CAP_LINK_EXCL | \
491 CEPH_CAP_XATTR_EXCL | \
493 #define CEPH_CAP_ANY_FILE_WR (CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER | \
495 #define CEPH_CAP_ANY_WR (CEPH_CAP_ANY_EXCL | CEPH_CAP_ANY_FILE_WR)
496 #define CEPH_CAP_ANY (CEPH_CAP_ANY_RD | CEPH_CAP_ANY_EXCL | \
497 CEPH_CAP_ANY_FILE_WR | CEPH_CAP_PIN)
499 #define CEPH_CAP_LOCKS (CEPH_LOCK_IFILE | CEPH_LOCK_IAUTH | CEPH_LOCK_ILINK | \
502 int ceph_caps_for_mode(int mode);
505 CEPH_CAP_OP_GRANT, /* mds->client grant */
506 CEPH_CAP_OP_REVOKE, /* mds->client revoke */
507 CEPH_CAP_OP_TRUNC, /* mds->client trunc notify */
508 CEPH_CAP_OP_EXPORT, /* mds has exported the cap */
509 CEPH_CAP_OP_IMPORT, /* mds has imported the cap */
510 CEPH_CAP_OP_UPDATE, /* client->mds update */
511 CEPH_CAP_OP_DROP, /* client->mds drop cap bits */
512 CEPH_CAP_OP_FLUSH, /* client->mds cap writeback */
513 CEPH_CAP_OP_FLUSH_ACK, /* mds->client flushed */
514 CEPH_CAP_OP_FLUSHSNAP, /* client->mds flush snapped metadata */
515 CEPH_CAP_OP_FLUSHSNAP_ACK, /* mds->client flushed snapped metadata */
516 CEPH_CAP_OP_RELEASE, /* client->mds release (clean) cap */
517 CEPH_CAP_OP_RENEW, /* client->mds renewal request */
520 extern const char *ceph_cap_op_name(int op);
523 * caps message, used for capability callbacks, acks, requests, etc.
525 struct ceph_mds_caps {
526 __le32 op; /* CEPH_CAP_OP_* */
529 __le32 seq, issue_seq;
530 __le32 caps, wanted, dirty; /* latest issued/wanted/dirty */
533 __le32 snap_trace_len;
534 __le64 client_tid; /* for FLUSH(SNAP) -> FLUSH(SNAP)_ACK */
537 __le32 uid, gid, mode;
544 __le64 xattr_version;
547 __le64 size, max_size, truncate_size;
549 struct ceph_timespec mtime, atime, ctime;
550 struct ceph_file_layout layout;
551 __le32 time_warp_seq;
552 } __attribute__ ((packed));
554 /* cap release msg head */
555 struct ceph_mds_cap_release {
556 __le32 num; /* number of cap_items that follow */
557 } __attribute__ ((packed));
559 struct ceph_mds_cap_item {
562 __le32 migrate_seq, seq;
563 } __attribute__ ((packed));
565 #define CEPH_MDS_LEASE_REVOKE 1 /* mds -> client */
566 #define CEPH_MDS_LEASE_RELEASE 2 /* client -> mds */
567 #define CEPH_MDS_LEASE_RENEW 3 /* client <-> mds */
568 #define CEPH_MDS_LEASE_REVOKE_ACK 4 /* client -> mds */
570 extern const char *ceph_lease_op_name(int o);
572 /* lease msg header */
573 struct ceph_mds_lease {
574 __u8 action; /* CEPH_MDS_LEASE_* */
575 __le16 mask; /* which lease */
577 __le64 first, last; /* snap range */
579 __le32 duration_ms; /* duration of renewal */
580 } __attribute__ ((packed));
581 /* followed by a __le32+string for dname */
583 /* client reconnect */
584 struct ceph_mds_cap_reconnect {
589 struct ceph_timespec mtime, atime;
591 __le64 pathbase; /* base ino for our path to this ino */
592 } __attribute__ ((packed));
593 /* followed by encoded string */
595 struct ceph_mds_snaprealm_reconnect {
596 __le64 ino; /* snap realm base */
597 __le64 seq; /* snap seq for this snap realm */
598 __le64 parent; /* parent realm */
599 } __attribute__ ((packed));
605 CEPH_SNAP_OP_UPDATE, /* CREATE or DESTROY */
607 CEPH_SNAP_OP_DESTROY,
611 extern const char *ceph_snap_op_name(int o);
613 /* snap msg header */
614 struct ceph_mds_snap_head {
615 __le32 op; /* CEPH_SNAP_OP_* */
616 __le64 split; /* ino to split off, if any */
617 __le32 num_split_inos; /* # inos belonging to new child realm */
618 __le32 num_split_realms; /* # child realms udner new child realm */
619 __le32 trace_len; /* size of snap trace blob */
620 } __attribute__ ((packed));
621 /* followed by split ino list, then split realms, then the trace blob */
624 * encode info about a snaprealm, as viewed by a client
626 struct ceph_mds_snap_realm {
627 __le64 ino; /* ino */
628 __le64 created; /* snap: when created */
629 __le64 parent; /* ino: parent realm */
630 __le64 parent_since; /* snap: same parent since */
631 __le64 seq; /* snap: version */
633 __le32 num_prior_parent_snaps;
634 } __attribute__ ((packed));
635 /* followed by my snap list, then prior parent snap list */