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cfbbcd24a6
linux/fs/ceph/ceph_fs.h
Sage Weil cfbbcd24a6 ceph: use strong hash function for mapping objects to pgs 
We were using the (weak) dcache hash function, but it was leaving lower
bits consecutive for consecutive (inode) objects.  We really want to make
the object to pg mapping random and uniform, so use a proper hash function
here.

This is Robert Jenkin's public domain hash function (with some minor
cleanup):
	http://burtleburtle.net/bob/hash/evahash.html

This is a protocol revision.

Signed-off-by: Sage Weil <sage@newdream.net>
2009-11-06 16:44:05 -08:00

640 lines
20 KiB
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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 22 /* 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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