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linux/fs/ceph/ceph_fs.h

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/*
* ceph_fs.h - Ceph constants and data types to share between kernel and
* user space.
*
* Most types in this file are defined as little-endian, and are
* primarily intended to describe data structures that pass over the
* wire or that are stored on disk.
*
* LGPL2
*/
#ifndef _FS_CEPH_CEPH_FS_H
#define _FS_CEPH_CEPH_FS_H
#include "msgr.h"
#include "rados.h"
/*
* Ceph release version
*/
#define CEPH_VERSION_MAJOR 0
#define CEPH_VERSION_MINOR 17
#define CEPH_VERSION_PATCH 0
#define _CEPH_STRINGIFY(x) #x
#define CEPH_STRINGIFY(x) _CEPH_STRINGIFY(x)
#define CEPH_MAKE_VERSION(x, y, z) CEPH_STRINGIFY(x) "." CEPH_STRINGIFY(y) \
"." CEPH_STRINGIFY(z)
#define CEPH_VERSION CEPH_MAKE_VERSION(CEPH_VERSION_MAJOR, \
CEPH_VERSION_MINOR, CEPH_VERSION_PATCH)
/*
* subprotocol versions. when specific messages types or high-level
* protocols change, bump the affected components. we keep rev
* internal cluster protocols separately from the public,
* client-facing protocol.
*/
#define CEPH_OSD_PROTOCOL 7 /* cluster internal */
#define CEPH_MDS_PROTOCOL 9 /* cluster internal */
#define CEPH_MON_PROTOCOL 5 /* cluster internal */
#define CEPH_OSDC_PROTOCOL 21 /* server/client */
#define CEPH_MDSC_PROTOCOL 29 /* server/client */
#define CEPH_MONC_PROTOCOL 15 /* server/client */
#define CEPH_INO_ROOT 1
/* arbitrary limit on max # of monitors (cluster of 3 is typical) */
#define CEPH_MAX_MON 31
unsigned int ceph_full_name_hash(const char *name, unsigned int len);
/*
* ceph_file_layout - describe data layout for a file/inode
*/
struct ceph_file_layout {
/* file -> object mapping */
__le32 fl_stripe_unit; /* stripe unit, in bytes. must be multiple
of page size. */
__le32 fl_stripe_count; /* over this many objects */
__le32 fl_object_size; /* until objects are this big, then move to
new objects */
__le32 fl_cas_hash; /* 0 = none; 1 = sha256 */
/* pg -> disk layout */
__le32 fl_object_stripe_unit; /* for per-object parity, if any */
/* object -> pg layout */
__le32 fl_pg_preferred; /* preferred primary for pg (-1 for none) */
__le32 fl_pg_pool; /* namespace, crush ruleset, rep level */
} __attribute__ ((packed));
#define CEPH_MIN_STRIPE_UNIT 65536
int ceph_file_layout_is_valid(const struct ceph_file_layout *layout);
/*********************************************
* message layer
*/
/*
* message types
*/
/* misc */
#define CEPH_MSG_SHUTDOWN 1
#define CEPH_MSG_PING 2
/* client <-> monitor */
#define CEPH_MSG_MON_MAP 4
#define CEPH_MSG_MON_GET_MAP 5
#define CEPH_MSG_CLIENT_MOUNT 10
#define CEPH_MSG_CLIENT_MOUNT_ACK 11
#define CEPH_MSG_STATFS 13
#define CEPH_MSG_STATFS_REPLY 14
#define CEPH_MSG_MON_SUBSCRIBE 15
#define CEPH_MSG_MON_SUBSCRIBE_ACK 16
/* client <-> mds */
#define CEPH_MSG_MDS_MAP 21
#define CEPH_MSG_CLIENT_SESSION 22
#define CEPH_MSG_CLIENT_RECONNECT 23
#define CEPH_MSG_CLIENT_REQUEST 24
#define CEPH_MSG_CLIENT_REQUEST_FORWARD 25
#define CEPH_MSG_CLIENT_REPLY 26
#define CEPH_MSG_CLIENT_CAPS 0x310
#define CEPH_MSG_CLIENT_LEASE 0x311
#define CEPH_MSG_CLIENT_SNAP 0x312
#define CEPH_MSG_CLIENT_CAPRELEASE 0x313
/* osd */
#define CEPH_MSG_OSD_MAP 41
#define CEPH_MSG_OSD_OP 42
#define CEPH_MSG_OSD_OPREPLY 43
struct ceph_mon_request_header {
__le64 have_version;
__le16 session_mon;
__le64 session_mon_tid;
} __attribute__ ((packed));
struct ceph_mon_statfs {
struct ceph_mon_request_header monhdr;
struct ceph_fsid fsid;
__le64 tid;
} __attribute__ ((packed));
struct ceph_statfs {
__le64 kb, kb_used, kb_avail;
__le64 num_objects;
} __attribute__ ((packed));
struct ceph_mon_statfs_reply {
struct ceph_fsid fsid;
__le64 tid;
__le64 version;
struct ceph_statfs st;
} __attribute__ ((packed));
struct ceph_osd_getmap {
struct ceph_mon_request_header monhdr;
struct ceph_fsid fsid;
__le32 start;
} __attribute__ ((packed));
struct ceph_mds_getmap {
struct ceph_mon_request_header monhdr;
struct ceph_fsid fsid;
} __attribute__ ((packed));
struct ceph_client_mount {
struct ceph_mon_request_header monhdr;
} __attribute__ ((packed));
struct ceph_mon_subscribe_item {
__le64 have_version; __le64 have;
__u8 onetime;
} __attribute__ ((packed));
struct ceph_mon_subscribe_ack {
__le32 duration; /* seconds */
struct ceph_fsid fsid;
} __attribute__ ((packed));
/*
* mds states
* > 0 -> in
* <= 0 -> out
*/
#define CEPH_MDS_STATE_DNE 0 /* down, does not exist. */
#define CEPH_MDS_STATE_STOPPED -1 /* down, once existed, but no subtrees.
empty log. */
#define CEPH_MDS_STATE_BOOT -4 /* up, boot announcement. */
#define CEPH_MDS_STATE_STANDBY -5 /* up, idle. waiting for assignment. */
#define CEPH_MDS_STATE_CREATING -6 /* up, creating MDS instance. */
#define CEPH_MDS_STATE_STARTING -7 /* up, starting previously stopped mds */
#define CEPH_MDS_STATE_STANDBY_REPLAY -8 /* up, tailing active node's journal */
#define CEPH_MDS_STATE_REPLAY 8 /* up, replaying journal. */
#define CEPH_MDS_STATE_RESOLVE 9 /* up, disambiguating distributed
operations (import, rename, etc.) */
#define CEPH_MDS_STATE_RECONNECT 10 /* up, reconnect to clients */
#define CEPH_MDS_STATE_REJOIN 11 /* up, rejoining distributed cache */
#define CEPH_MDS_STATE_CLIENTREPLAY 12 /* up, replaying client operations */
#define CEPH_MDS_STATE_ACTIVE 13 /* up, active */
#define CEPH_MDS_STATE_STOPPING 14 /* up, but exporting metadata */
extern const char *ceph_mds_state_name(int s);
/*
* metadata lock types.
* - these are bitmasks.. we can compose them
* - they also define the lock ordering by the MDS
* - a few of these are internal to the mds
*/
#define CEPH_LOCK_DN 1
#define CEPH_LOCK_ISNAP 2
#define CEPH_LOCK_IVERSION 4 /* mds internal */
#define CEPH_LOCK_IFILE 8 /* mds internal */
#define CEPH_LOCK_IAUTH 32
#define CEPH_LOCK_ILINK 64
#define CEPH_LOCK_IDFT 128 /* dir frag tree */
#define CEPH_LOCK_INEST 256 /* mds internal */
#define CEPH_LOCK_IXATTR 512
#define CEPH_LOCK_INO 2048 /* immutable inode bits; not a lock */
/* client_session ops */
enum {
CEPH_SESSION_REQUEST_OPEN,
CEPH_SESSION_OPEN,
CEPH_SESSION_REQUEST_CLOSE,
CEPH_SESSION_CLOSE,
CEPH_SESSION_REQUEST_RENEWCAPS,
CEPH_SESSION_RENEWCAPS,
CEPH_SESSION_STALE,
CEPH_SESSION_RECALL_STATE,
};
extern const char *ceph_session_op_name(int op);
struct ceph_mds_session_head {
__le32 op;
__le64 seq;
struct ceph_timespec stamp;
__le32 max_caps, max_leases;
} __attribute__ ((packed));
/* client_request */
/*
* metadata ops.
* & 0x001000 -> write op
* & 0x010000 -> follow symlink (e.g. stat(), not lstat()).
& & 0x100000 -> use weird ino/path trace
*/
#define CEPH_MDS_OP_WRITE 0x001000
enum {
CEPH_MDS_OP_LOOKUP = 0x00100,
CEPH_MDS_OP_GETATTR = 0x00101,
CEPH_MDS_OP_LOOKUPHASH = 0x00102,
CEPH_MDS_OP_LOOKUPPARENT = 0x00103,
CEPH_MDS_OP_SETXATTR = 0x01105,
CEPH_MDS_OP_RMXATTR = 0x01106,
CEPH_MDS_OP_SETLAYOUT = 0x01107,
CEPH_MDS_OP_SETATTR = 0x01108,
CEPH_MDS_OP_MKNOD = 0x01201,
CEPH_MDS_OP_LINK = 0x01202,
CEPH_MDS_OP_UNLINK = 0x01203,
CEPH_MDS_OP_RENAME = 0x01204,
CEPH_MDS_OP_MKDIR = 0x01220,
CEPH_MDS_OP_RMDIR = 0x01221,
CEPH_MDS_OP_SYMLINK = 0x01222,
CEPH_MDS_OP_CREATE = 0x00301,
CEPH_MDS_OP_OPEN = 0x00302,
CEPH_MDS_OP_READDIR = 0x00305,
CEPH_MDS_OP_LOOKUPSNAP = 0x00400,
CEPH_MDS_OP_MKSNAP = 0x01400,
CEPH_MDS_OP_RMSNAP = 0x01401,
CEPH_MDS_OP_LSSNAP = 0x00402,
};
extern const char *ceph_mds_op_name(int op);
#define CEPH_SETATTR_MODE 1
#define CEPH_SETATTR_UID 2
#define CEPH_SETATTR_GID 4
#define CEPH_SETATTR_MTIME 8
#define CEPH_SETATTR_ATIME 16
#define CEPH_SETATTR_SIZE 32
#define CEPH_SETATTR_CTIME 64
union ceph_mds_request_args {
struct {
__le32 mask; /* CEPH_CAP_* */
} __attribute__ ((packed)) getattr;
struct {
__le32 mode;
__le32 uid;
__le32 gid;
struct ceph_timespec mtime;
struct ceph_timespec atime;
__le64 size, old_size; /* old_size needed by truncate */
__le32 mask; /* CEPH_SETATTR_* */
} __attribute__ ((packed)) setattr;
struct {
__le32 frag; /* which dir fragment */
__le32 max_entries; /* how many dentries to grab */
} __attribute__ ((packed)) readdir;
struct {
__le32 mode;
__le32 rdev;
} __attribute__ ((packed)) mknod;
struct {
__le32 mode;
} __attribute__ ((packed)) mkdir;
struct {
__le32 flags;
__le32 mode;
__le32 stripe_unit; /* layout for newly created file */
__le32 stripe_count; /* ... */
__le32 object_size;
__le32 file_replication;
__le32 preferred;
} __attribute__ ((packed)) open;
struct {
__le32 flags;
} __attribute__ ((packed)) setxattr;
struct {
struct ceph_file_layout layout;
} __attribute__ ((packed)) setlayout;
} __attribute__ ((packed));
#define CEPH_MDS_FLAG_REPLAY 1 /* this is a replayed op */
#define CEPH_MDS_FLAG_WANT_DENTRY 2 /* want dentry in reply */
struct ceph_mds_request_head {
__le64 tid, oldest_client_tid;
__le32 mdsmap_epoch; /* on client */
__le32 flags; /* CEPH_MDS_FLAG_* */
__u8 num_retry, num_fwd; /* count retry, fwd attempts */
__le16 num_releases; /* # include cap/lease release records */
__le32 op; /* mds op code */
__le32 caller_uid, caller_gid;
__le64 ino; /* use this ino for openc, mkdir, mknod,
etc. (if replaying) */
union ceph_mds_request_args args;
} __attribute__ ((packed));
/* cap/lease release record */
struct ceph_mds_request_release {
__le64 ino, cap_id; /* ino and unique cap id */
__le32 caps, wanted; /* new issued, wanted */
__le32 seq, issue_seq, mseq;
__le32 dname_seq; /* if releasing a dentry lease, a */
__le32 dname_len; /* string follows. */
} __attribute__ ((packed));
/* client reply */
struct ceph_mds_reply_head {
__le64 tid;
__le32 op;
__le32 result;
__le32 mdsmap_epoch;
__u8 safe; /* true if committed to disk */
__u8 is_dentry, is_target; /* true if dentry, target inode records
are included with reply */
} __attribute__ ((packed));
/* one for each node split */
struct ceph_frag_tree_split {
__le32 frag; /* this frag splits... */
__le32 by; /* ...by this many bits */
} __attribute__ ((packed));
struct ceph_frag_tree_head {
__le32 nsplits; /* num ceph_frag_tree_split records */
struct ceph_frag_tree_split splits[];
} __attribute__ ((packed));
/* capability issue, for bundling with mds reply */
struct ceph_mds_reply_cap {
__le32 caps, wanted; /* caps issued, wanted */
__le64 cap_id;
__le32 seq, mseq;
__le64 realm; /* snap realm */
__u8 flags; /* CEPH_CAP_FLAG_* */
} __attribute__ ((packed));
#define CEPH_CAP_FLAG_AUTH 1 /* cap is issued by auth mds */
/* inode record, for bundling with mds reply */
struct ceph_mds_reply_inode {
__le64 ino;
__le64 snapid;
__le32 rdev;
__le64 version; /* inode version */
__le64 xattr_version; /* version for xattr blob */
struct ceph_mds_reply_cap cap; /* caps issued for this inode */
struct ceph_file_layout layout;
struct ceph_timespec ctime, mtime, atime;
__le32 time_warp_seq;
__le64 size, max_size, truncate_size;
__le32 truncate_seq;
__le32 mode, uid, gid;
__le32 nlink;
__le64 files, subdirs, rbytes, rfiles, rsubdirs; /* dir stats */
struct ceph_timespec rctime;
struct ceph_frag_tree_head fragtree; /* (must be at end of struct) */
} __attribute__ ((packed));
/* followed by frag array, then symlink string, then xattr blob */
/* reply_lease follows dname, and reply_inode */
struct ceph_mds_reply_lease {
__le16 mask; /* lease type(s) */
__le32 duration_ms; /* lease duration */
__le32 seq;
} __attribute__ ((packed));
struct ceph_mds_reply_dirfrag {
__le32 frag; /* fragment */
__le32 auth; /* auth mds, if this is a delegation point */
__le32 ndist; /* number of mds' this is replicated on */
__le32 dist[];
} __attribute__ ((packed));
/* file access modes */
#define CEPH_FILE_MODE_PIN 0
#define CEPH_FILE_MODE_RD 1
#define CEPH_FILE_MODE_WR 2
#define CEPH_FILE_MODE_RDWR 3 /* RD | WR */
#define CEPH_FILE_MODE_LAZY 4 /* lazy io */
#define CEPH_FILE_MODE_NUM 8 /* bc these are bit fields.. mostly */
int ceph_flags_to_mode(int flags);
/* capability bits */
#define CEPH_CAP_PIN 1 /* no specific capabilities beyond the pin */
/* generic cap bits */
#define CEPH_CAP_GSHARED 1 /* client can reads */
#define CEPH_CAP_GEXCL 2 /* client can read and update */
#define CEPH_CAP_GCACHE 4 /* (file) client can cache reads */
#define CEPH_CAP_GRD 8 /* (file) client can read */
#define CEPH_CAP_GWR 16 /* (file) client can write */
#define CEPH_CAP_GBUFFER 32 /* (file) client can buffer writes */
#define CEPH_CAP_GWREXTEND 64 /* (file) client can extend EOF */
#define CEPH_CAP_GLAZYIO 128 /* (file) client can perform lazy io */
/* per-lock shift */
#define CEPH_CAP_SAUTH 2
#define CEPH_CAP_SLINK 4
#define CEPH_CAP_SXATTR 6
#define CEPH_CAP_SFILE 8 /* goes at the end (uses >2 cap bits) */
#define CEPH_CAP_BITS 16
/* composed values */
#define CEPH_CAP_AUTH_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SAUTH)
#define CEPH_CAP_AUTH_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SAUTH)
#define CEPH_CAP_LINK_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SLINK)
#define CEPH_CAP_LINK_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SLINK)
#define CEPH_CAP_XATTR_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SXATTR)
#define CEPH_CAP_XATTR_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SXATTR)
#define CEPH_CAP_FILE(x) (x << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_SHARED (CEPH_CAP_GSHARED << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_EXCL (CEPH_CAP_GEXCL << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_CACHE (CEPH_CAP_GCACHE << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_RD (CEPH_CAP_GRD << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_WR (CEPH_CAP_GWR << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_BUFFER (CEPH_CAP_GBUFFER << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_WREXTEND (CEPH_CAP_GWREXTEND << CEPH_CAP_SFILE)
#define CEPH_CAP_FILE_LAZYIO (CEPH_CAP_GLAZYIO << CEPH_CAP_SFILE)
/* cap masks (for getattr) */
#define CEPH_STAT_CAP_INODE CEPH_CAP_PIN
#define CEPH_STAT_CAP_TYPE CEPH_CAP_PIN /* mode >> 12 */
#define CEPH_STAT_CAP_SYMLINK CEPH_CAP_PIN
#define CEPH_STAT_CAP_UID CEPH_CAP_AUTH_SHARED
#define CEPH_STAT_CAP_GID CEPH_CAP_AUTH_SHARED
#define CEPH_STAT_CAP_MODE CEPH_CAP_AUTH_SHARED
#define CEPH_STAT_CAP_NLINK CEPH_CAP_LINK_SHARED
#define CEPH_STAT_CAP_LAYOUT CEPH_CAP_FILE_SHARED
#define CEPH_STAT_CAP_MTIME CEPH_CAP_FILE_SHARED
#define CEPH_STAT_CAP_SIZE CEPH_CAP_FILE_SHARED
#define CEPH_STAT_CAP_ATIME CEPH_CAP_FILE_SHARED /* fixme */
#define CEPH_STAT_CAP_XATTR CEPH_CAP_XATTR_SHARED
#define CEPH_STAT_CAP_INODE_ALL (CEPH_CAP_PIN | \
CEPH_CAP_AUTH_SHARED | \
CEPH_CAP_LINK_SHARED | \
CEPH_CAP_FILE_SHARED | \
CEPH_CAP_XATTR_SHARED)
#define CEPH_CAP_ANY_SHARED (CEPH_CAP_AUTH_SHARED | \
CEPH_CAP_LINK_SHARED | \
CEPH_CAP_XATTR_SHARED | \
CEPH_CAP_FILE_SHARED)
#define CEPH_CAP_ANY_RD (CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_RD | \
CEPH_CAP_FILE_CACHE)
#define CEPH_CAP_ANY_EXCL (CEPH_CAP_AUTH_EXCL | \
CEPH_CAP_LINK_EXCL | \
CEPH_CAP_XATTR_EXCL | \
CEPH_CAP_FILE_EXCL)
#define CEPH_CAP_ANY_FILE_WR (CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER | \
CEPH_CAP_FILE_EXCL)
#define CEPH_CAP_ANY_WR (CEPH_CAP_ANY_EXCL | CEPH_CAP_ANY_FILE_WR)
#define CEPH_CAP_ANY (CEPH_CAP_ANY_RD | CEPH_CAP_ANY_EXCL | \
CEPH_CAP_ANY_FILE_WR | CEPH_CAP_PIN)
#define CEPH_CAP_LOCKS (CEPH_LOCK_IFILE | CEPH_LOCK_IAUTH | CEPH_LOCK_ILINK | \
CEPH_LOCK_IXATTR)
int ceph_caps_for_mode(int mode);
enum {
CEPH_CAP_OP_GRANT, /* mds->client grant */
CEPH_CAP_OP_REVOKE, /* mds->client revoke */
CEPH_CAP_OP_TRUNC, /* mds->client trunc notify */
CEPH_CAP_OP_EXPORT, /* mds has exported the cap */
CEPH_CAP_OP_IMPORT, /* mds has imported the cap */
CEPH_CAP_OP_UPDATE, /* client->mds update */
CEPH_CAP_OP_DROP, /* client->mds drop cap bits */
CEPH_CAP_OP_FLUSH, /* client->mds cap writeback */
CEPH_CAP_OP_FLUSH_ACK, /* mds->client flushed */
CEPH_CAP_OP_FLUSHSNAP, /* client->mds flush snapped metadata */
CEPH_CAP_OP_FLUSHSNAP_ACK, /* mds->client flushed snapped metadata */
CEPH_CAP_OP_RELEASE, /* client->mds release (clean) cap */
CEPH_CAP_OP_RENEW, /* client->mds renewal request */
};
extern const char *ceph_cap_op_name(int op);
/*
* caps message, used for capability callbacks, acks, requests, etc.
*/
struct ceph_mds_caps {
__le32 op; /* CEPH_CAP_OP_* */
__le64 ino, realm;
__le64 cap_id;
__le32 seq, issue_seq;
__le32 caps, wanted, dirty; /* latest issued/wanted/dirty */
__le32 migrate_seq;
__le64 snap_follows;
__le32 snap_trace_len;
__le64 client_tid; /* for FLUSH(SNAP) -> FLUSH(SNAP)_ACK */
/* authlock */
__le32 uid, gid, mode;
/* linklock */
__le32 nlink;
/* xattrlock */
__le32 xattr_len;
__le64 xattr_version;
/* filelock */
__le64 size, max_size, truncate_size;
__le32 truncate_seq;
struct ceph_timespec mtime, atime, ctime;
struct ceph_file_layout layout;
__le32 time_warp_seq;
} __attribute__ ((packed));
/* cap release msg head */
struct ceph_mds_cap_release {
__le32 num; /* number of cap_items that follow */
} __attribute__ ((packed));
struct ceph_mds_cap_item {
__le64 ino;
__le64 cap_id;
__le32 migrate_seq, seq;
} __attribute__ ((packed));
#define CEPH_MDS_LEASE_REVOKE 1 /* mds -> client */
#define CEPH_MDS_LEASE_RELEASE 2 /* client -> mds */
#define CEPH_MDS_LEASE_RENEW 3 /* client <-> mds */
#define CEPH_MDS_LEASE_REVOKE_ACK 4 /* client -> mds */
extern const char *ceph_lease_op_name(int o);
/* lease msg header */
struct ceph_mds_lease {
__u8 action; /* CEPH_MDS_LEASE_* */
__le16 mask; /* which lease */
__le64 ino;
__le64 first, last; /* snap range */
__le32 seq;
__le32 duration_ms; /* duration of renewal */
} __attribute__ ((packed));
/* followed by a __le32+string for dname */
/* client reconnect */
struct ceph_mds_cap_reconnect {
__le64 cap_id;
__le32 wanted;
__le32 issued;
__le64 size;
struct ceph_timespec mtime, atime;
__le64 snaprealm;
__le64 pathbase; /* base ino for our path to this ino */
} __attribute__ ((packed));
/* followed by encoded string */
struct ceph_mds_snaprealm_reconnect {
__le64 ino; /* snap realm base */
__le64 seq; /* snap seq for this snap realm */
__le64 parent; /* parent realm */
} __attribute__ ((packed));
/*
* snaps
*/
enum {
CEPH_SNAP_OP_UPDATE, /* CREATE or DESTROY */
CEPH_SNAP_OP_CREATE,
CEPH_SNAP_OP_DESTROY,
CEPH_SNAP_OP_SPLIT,
};
extern const char *ceph_snap_op_name(int o);
/* snap msg header */
struct ceph_mds_snap_head {
__le32 op; /* CEPH_SNAP_OP_* */
__le64 split; /* ino to split off, if any */
__le32 num_split_inos; /* # inos belonging to new child realm */
__le32 num_split_realms; /* # child realms udner new child realm */
__le32 trace_len; /* size of snap trace blob */
} __attribute__ ((packed));
/* followed by split ino list, then split realms, then the trace blob */
/*
* encode info about a snaprealm, as viewed by a client
*/
struct ceph_mds_snap_realm {
__le64 ino; /* ino */
__le64 created; /* snap: when created */
__le64 parent; /* ino: parent realm */
__le64 parent_since; /* snap: same parent since */
__le64 seq; /* snap: version */
__le32 num_snaps;
__le32 num_prior_parent_snaps;
} __attribute__ ((packed));
/* followed by my snap list, then prior parent snap list */
#endif
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