include/linux/ceph/rados.h - arm/linux-arm-legacy - Git at Google

 #ifndef CEPH_RADOS_H
 #define CEPH_RADOS_H

 /*
  * Data types for the Ceph distributed object storage layer RADOS
  * (Reliable Autonomic Distributed Object Store).
  */

 #include <linux/ceph/msgr.h>

 /*
  * fs id
  */
 struct ceph_fsid {
 	unsigned char fsid[16];
 };

 static inline int ceph_fsid_compare(const struct ceph_fsid *a,
 				    const struct ceph_fsid *b)
 {
 	return memcmp(a, b, sizeof(*a));
 }

 /*
  * ino, object, etc.
  */
 typedef __le64 ceph_snapid_t;
 #define CEPH_SNAPDIR ((__u64)(-1))  /* reserved for hidden .snap dir */
 #define CEPH_NOSNAP  ((__u64)(-2))  /* "head", "live" revision */
 #define CEPH_MAXSNAP ((__u64)(-3))  /* largest valid snapid */

 struct ceph_timespec {
 	__le32 tv_sec;
 	__le32 tv_nsec;
 } __attribute__ ((packed));


 /*
  * object layout - how objects are mapped into PGs
  */
 #define CEPH_OBJECT_LAYOUT_HASH     1
 #define CEPH_OBJECT_LAYOUT_LINEAR   2
 #define CEPH_OBJECT_LAYOUT_HASHINO  3

 /*
  * pg layout -- how PGs are mapped onto (sets of) OSDs
  */
 #define CEPH_PG_LAYOUT_CRUSH  0
 #define CEPH_PG_LAYOUT_HASH   1
 #define CEPH_PG_LAYOUT_LINEAR 2
 #define CEPH_PG_LAYOUT_HYBRID 3

 #define CEPH_PG_MAX_SIZE      16  /* max # osds in a single pg */

 /*
  * placement group.
  * we encode this into one __le64.
  */
 struct ceph_pg_v1 {
 	__le16 preferred; /* preferred primary osd */
 	__le16 ps;        /* placement seed */
 	__le32 pool;      /* object pool */
 } __attribute__ ((packed));

 /*
  * pg_pool is a set of pgs storing a pool of objects
  *
  *  pg_num -- base number of pseudorandomly placed pgs
  *
  *  pgp_num -- effective number when calculating pg placement.  this
  * is used for pg_num increases.  new pgs result in data being "split"
  * into new pgs.  for this to proceed smoothly, new pgs are intiially
  * colocated with their parents; that is, pgp_num doesn't increase
  * until the new pgs have successfully split.  only _then_ are the new
  * pgs placed independently.
  *
  *  lpg_num -- localized pg count (per device).  replicas are randomly
  * selected.
  *
  *  lpgp_num -- as above.
  */
 #define CEPH_NOPOOL  ((__u64) (-1))  /* pool id not defined */

 #define CEPH_PG_TYPE_REP     1
 #define CEPH_PG_TYPE_RAID4   2

 /*
  * stable_mod func is used to control number of placement groups.
  * similar to straight-up modulo, but produces a stable mapping as b
  * increases over time.  b is the number of bins, and bmask is the
  * containing power of 2 minus 1.
  *
  * b <= bmask and bmask=(2**n)-1
  * e.g., b=12 -> bmask=15, b=123 -> bmask=127
  */
 static inline int ceph_stable_mod(int x, int b, int bmask)
 {
 	if ((x & bmask) < b)
 		return x & bmask;
 	else
 		return x & (bmask >> 1);
 }

 /*
  * object layout - how a given object should be stored.
  */
 struct ceph_object_layout {
 	struct ceph_pg_v1 ol_pgid;   /* raw pg, with _full_ ps precision. */
 	__le32 ol_stripe_unit;    /* for per-object parity, if any */
 } __attribute__ ((packed));

 /*
  * compound epoch+version, used by storage layer to serialize mutations
  */
 struct ceph_eversion {
 	__le32 epoch;
 	__le64 version;
 } __attribute__ ((packed));

 /*
  * osd map bits
  */

 /* status bits */
 #define CEPH_OSD_EXISTS  (1<<0)
 #define CEPH_OSD_UP      (1<<1)
 #define CEPH_OSD_AUTOOUT (1<<2)  /* osd was automatically marked out */
 #define CEPH_OSD_NEW     (1<<3)  /* osd is new, never marked in */

 extern const char *ceph_osd_state_name(int s);

 /* osd weights.  fixed point value: 0x10000 == 1.0 ("in"), 0 == "out" */
 #define CEPH_OSD_IN  0x10000
 #define CEPH_OSD_OUT 0


 /*
  * osd map flag bits
  */
 #define CEPH_OSDMAP_NEARFULL (1<<0)  /* sync writes (near ENOSPC) */
 #define CEPH_OSDMAP_FULL     (1<<1)  /* no data writes (ENOSPC) */
 #define CEPH_OSDMAP_PAUSERD  (1<<2)  /* pause all reads */
 #define CEPH_OSDMAP_PAUSEWR  (1<<3)  /* pause all writes */
 #define CEPH_OSDMAP_PAUSEREC (1<<4)  /* pause recovery */
 #define CEPH_OSDMAP_NOUP     (1<<5)  /* block osd boot */
 #define CEPH_OSDMAP_NODOWN   (1<<6)  /* block osd mark-down/failure */
 #define CEPH_OSDMAP_NOOUT    (1<<7)  /* block osd auto mark-out */
 #define CEPH_OSDMAP_NOIN     (1<<8)  /* block osd auto mark-in */
 #define CEPH_OSDMAP_NOBACKFILL (1<<9) /* block osd backfill */
 #define CEPH_OSDMAP_NORECOVER (1<<10) /* block osd recovery and backfill */

 /*
  * The error code to return when an OSD can't handle a write
  * because it is too large.
  */
 #define OSD_WRITETOOBIG EMSGSIZE

 /*
  * osd ops
  *
  * WARNING: do not use these op codes directly.  Use the helpers
  * defined below instead.  In certain cases, op code behavior was
  * redefined, resulting in special-cases in the helpers.
  */
 #define CEPH_OSD_OP_MODE       0xf000
 #define CEPH_OSD_OP_MODE_RD    0x1000
 #define CEPH_OSD_OP_MODE_WR    0x2000
 #define CEPH_OSD_OP_MODE_RMW   0x3000
 #define CEPH_OSD_OP_MODE_SUB   0x4000

 #define CEPH_OSD_OP_TYPE       0x0f00
 #define CEPH_OSD_OP_TYPE_LOCK  0x0100
 #define CEPH_OSD_OP_TYPE_DATA  0x0200
 #define CEPH_OSD_OP_TYPE_ATTR  0x0300
 #define CEPH_OSD_OP_TYPE_EXEC  0x0400
 #define CEPH_OSD_OP_TYPE_PG    0x0500
 #define CEPH_OSD_OP_TYPE_MULTI 0x0600 /* multiobject */

 enum {
 	/** data **/
 	/* read */
 	CEPH_OSD_OP_READ      = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 1,
 	CEPH_OSD_OP_STAT      = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 2,
 	CEPH_OSD_OP_MAPEXT    = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 3,

 	/* fancy read */
 	CEPH_OSD_OP_MASKTRUNC   = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 4,
 	CEPH_OSD_OP_SPARSE_READ = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 5,

 	CEPH_OSD_OP_NOTIFY    = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 6,
 	CEPH_OSD_OP_NOTIFY_ACK = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 7,

 	/* versioning */
 	CEPH_OSD_OP_ASSERT_VER = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 8,

 	/* write */
 	CEPH_OSD_OP_WRITE     = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 1,
 	CEPH_OSD_OP_WRITEFULL = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 2,
 	CEPH_OSD_OP_TRUNCATE  = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 3,
 	CEPH_OSD_OP_ZERO      = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 4,
 	CEPH_OSD_OP_DELETE    = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 5,

 	/* fancy write */
 	CEPH_OSD_OP_APPEND    = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 6,
 	CEPH_OSD_OP_STARTSYNC = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 7,
 	CEPH_OSD_OP_SETTRUNC  = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 8,
 	CEPH_OSD_OP_TRIMTRUNC = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 9,

 	CEPH_OSD_OP_TMAPUP  = CEPH_OSD_OP_MODE_RMW | CEPH_OSD_OP_TYPE_DATA | 10,
 	CEPH_OSD_OP_TMAPPUT = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 11,
 	CEPH_OSD_OP_TMAPGET = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 12,

 	CEPH_OSD_OP_CREATE  = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 13,
 	CEPH_OSD_OP_ROLLBACK= CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 14,

 	CEPH_OSD_OP_WATCH   = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 15,

 	/* omap */
 	CEPH_OSD_OP_OMAPGETKEYS   = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 17,
 	CEPH_OSD_OP_OMAPGETVALS   = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 18,
 	CEPH_OSD_OP_OMAPGETHEADER = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 19,
 	CEPH_OSD_OP_OMAPGETVALSBYKEYS  =
 	  CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 20,
 	CEPH_OSD_OP_OMAPSETVALS   = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 21,
 	CEPH_OSD_OP_OMAPSETHEADER = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 22,
 	CEPH_OSD_OP_OMAPCLEAR     = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 23,
 	CEPH_OSD_OP_OMAPRMKEYS    = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_DATA | 24,
 	CEPH_OSD_OP_OMAP_CMP      = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_DATA | 25,

 	/** multi **/
 	CEPH_OSD_OP_CLONERANGE = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_MULTI | 1,
 	CEPH_OSD_OP_ASSERT_SRC_VERSION = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_MULTI | 2,
 	CEPH_OSD_OP_SRC_CMPXATTR = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_MULTI | 3,

 	/** attrs **/
 	/* read */
 	CEPH_OSD_OP_GETXATTR  = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_ATTR | 1,
 	CEPH_OSD_OP_GETXATTRS = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_ATTR | 2,
 	CEPH_OSD_OP_CMPXATTR  = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_ATTR | 3,

 	/* write */
 	CEPH_OSD_OP_SETXATTR  = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_ATTR | 1,
 	CEPH_OSD_OP_SETXATTRS = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_ATTR | 2,
 	CEPH_OSD_OP_RESETXATTRS = CEPH_OSD_OP_MODE_WR|CEPH_OSD_OP_TYPE_ATTR | 3,
 	CEPH_OSD_OP_RMXATTR   = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_ATTR | 4,

 	/** subop **/
 	CEPH_OSD_OP_PULL            = CEPH_OSD_OP_MODE_SUB | 1,
 	CEPH_OSD_OP_PUSH            = CEPH_OSD_OP_MODE_SUB | 2,
 	CEPH_OSD_OP_BALANCEREADS    = CEPH_OSD_OP_MODE_SUB | 3,
 	CEPH_OSD_OP_UNBALANCEREADS  = CEPH_OSD_OP_MODE_SUB | 4,
 	CEPH_OSD_OP_SCRUB           = CEPH_OSD_OP_MODE_SUB | 5,
 	CEPH_OSD_OP_SCRUB_RESERVE   = CEPH_OSD_OP_MODE_SUB | 6,
 	CEPH_OSD_OP_SCRUB_UNRESERVE = CEPH_OSD_OP_MODE_SUB | 7,
 	CEPH_OSD_OP_SCRUB_STOP      = CEPH_OSD_OP_MODE_SUB | 8,
 	CEPH_OSD_OP_SCRUB_MAP     = CEPH_OSD_OP_MODE_SUB | 9,

 	/** lock **/
 	CEPH_OSD_OP_WRLOCK    = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_LOCK | 1,
 	CEPH_OSD_OP_WRUNLOCK  = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_LOCK | 2,
 	CEPH_OSD_OP_RDLOCK    = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_LOCK | 3,
 	CEPH_OSD_OP_RDUNLOCK  = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_LOCK | 4,
 	CEPH_OSD_OP_UPLOCK    = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_LOCK | 5,
 	CEPH_OSD_OP_DNLOCK    = CEPH_OSD_OP_MODE_WR | CEPH_OSD_OP_TYPE_LOCK | 6,

 	/** exec **/
 	/* note: the RD bit here is wrong; see special-case below in helper */
 	CEPH_OSD_OP_CALL    = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_EXEC | 1,

 	/** pg **/
 	CEPH_OSD_OP_PGLS      = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_PG | 1,
 	CEPH_OSD_OP_PGLS_FILTER = CEPH_OSD_OP_MODE_RD | CEPH_OSD_OP_TYPE_PG | 2,
 };

 static inline int ceph_osd_op_type_lock(int op)
 {
 	return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_LOCK;
 }
 static inline int ceph_osd_op_type_data(int op)
 {
 	return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_DATA;
 }
 static inline int ceph_osd_op_type_attr(int op)
 {
 	return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_ATTR;
 }
 static inline int ceph_osd_op_type_exec(int op)
 {
 	return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_EXEC;
 }
 static inline int ceph_osd_op_type_pg(int op)
 {
 	return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_PG;
 }
 static inline int ceph_osd_op_type_multi(int op)
 {
 	return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_MULTI;
 }

 static inline int ceph_osd_op_mode_subop(int op)
 {
 	return (op & CEPH_OSD_OP_MODE) == CEPH_OSD_OP_MODE_SUB;
 }
 static inline int ceph_osd_op_mode_read(int op)
 {
 	return (op & CEPH_OSD_OP_MODE_RD) &&
 		op != CEPH_OSD_OP_CALL;
 }
 static inline int ceph_osd_op_mode_modify(int op)
 {
 	return op & CEPH_OSD_OP_MODE_WR;
 }

 /*
  * note that the following tmap stuff is also defined in the ceph librados.h
  * any modification here needs to be updated there
  */
 #define CEPH_OSD_TMAP_HDR 'h'
 #define CEPH_OSD_TMAP_SET 's'
 #define CEPH_OSD_TMAP_CREATE 'c' /* create key */
 #define CEPH_OSD_TMAP_RM  'r'
 #define CEPH_OSD_TMAP_RMSLOPPY 'R'

 extern const char *ceph_osd_op_name(int op);

 /*
  * osd op flags
  *
  * An op may be READ, WRITE, or READ|WRITE.
  */
 enum {
 	CEPH_OSD_FLAG_ACK =            0x0001,  /* want (or is) "ack" ack */
 	CEPH_OSD_FLAG_ONNVRAM =        0x0002,  /* want (or is) "onnvram" ack */
 	CEPH_OSD_FLAG_ONDISK =         0x0004,  /* want (or is) "ondisk" ack */
 	CEPH_OSD_FLAG_RETRY =          0x0008,  /* resend attempt */
 	CEPH_OSD_FLAG_READ =           0x0010,  /* op may read */
 	CEPH_OSD_FLAG_WRITE =          0x0020,  /* op may write */
 	CEPH_OSD_FLAG_ORDERSNAP =      0x0040,  /* EOLDSNAP if snapc is out of order */
 	CEPH_OSD_FLAG_PEERSTAT_OLD =   0x0080,  /* DEPRECATED msg includes osd_peer_stat */
 	CEPH_OSD_FLAG_BALANCE_READS =  0x0100,
 	CEPH_OSD_FLAG_PARALLELEXEC =   0x0200,  /* execute op in parallel */
 	CEPH_OSD_FLAG_PGOP =           0x0400,  /* pg op, no object */
 	CEPH_OSD_FLAG_EXEC =           0x0800,  /* op may exec */
 	CEPH_OSD_FLAG_EXEC_PUBLIC =    0x1000,  /* DEPRECATED op may exec (public) */
 	CEPH_OSD_FLAG_LOCALIZE_READS = 0x2000,  /* read from nearby replica, if any */
 	CEPH_OSD_FLAG_RWORDERED =      0x4000,  /* order wrt concurrent reads */
 	CEPH_OSD_FLAG_IGNORE_CACHE =   0x8000,  /* ignore cache logic */
 	CEPH_OSD_FLAG_SKIPRWLOCKS =   0x10000,  /* skip rw locks */
 	CEPH_OSD_FLAG_IGNORE_OVERLAY = 0x20000, /* ignore pool overlay */
 	CEPH_OSD_FLAG_FLUSH =         0x40000,  /* this is part of flush */
 };

 enum {
 	CEPH_OSD_OP_FLAG_EXCL = 1,      /* EXCL object create */
 	CEPH_OSD_OP_FLAG_FAILOK = 2,    /* continue despite failure */
 };

 #define EOLDSNAPC    ERESTART  /* ORDERSNAP flag set; writer has old snapc*/
 #define EBLACKLISTED ESHUTDOWN /* blacklisted */

 /* xattr comparison */
 enum {
 	CEPH_OSD_CMPXATTR_OP_NOP = 0,
 	CEPH_OSD_CMPXATTR_OP_EQ  = 1,
 	CEPH_OSD_CMPXATTR_OP_NE  = 2,
 	CEPH_OSD_CMPXATTR_OP_GT  = 3,
 	CEPH_OSD_CMPXATTR_OP_GTE = 4,
 	CEPH_OSD_CMPXATTR_OP_LT  = 5,
 	CEPH_OSD_CMPXATTR_OP_LTE = 6
 };

 enum {
 	CEPH_OSD_CMPXATTR_MODE_STRING = 1,
 	CEPH_OSD_CMPXATTR_MODE_U64    = 2
 };

 #define RADOS_NOTIFY_VER	1

 /*
  * an individual object operation.  each may be accompanied by some data
  * payload
  */
 struct ceph_osd_op {
 	__le16 op;           /* CEPH_OSD_OP_* */
 	__le32 flags;        /* CEPH_OSD_FLAG_* */
 	union {
 		struct {
 			__le64 offset, length;
 			__le64 truncate_size;
 			__le32 truncate_seq;
 		} __attribute__ ((packed)) extent;
 		struct {
 			__le32 name_len;
 			__le32 value_len;
 			__u8 cmp_op;       /* CEPH_OSD_CMPXATTR_OP_* */
 			__u8 cmp_mode;     /* CEPH_OSD_CMPXATTR_MODE_* */
 		} __attribute__ ((packed)) xattr;
 		struct {
 			__u8 class_len;
 			__u8 method_len;
 			__u8 argc;
 			__le32 indata_len;
 		} __attribute__ ((packed)) cls;
 		struct {
 			__le64 cookie, count;
 		} __attribute__ ((packed)) pgls;
 	        struct {
 		        __le64 snapid;
 	        } __attribute__ ((packed)) snap;
 		struct {
 			__le64 cookie;
 			__le64 ver;
 			__u8 flag;	/* 0 = unwatch, 1 = watch */
 		} __attribute__ ((packed)) watch;
 		struct {
 			__le64 offset, length;
 			__le64 src_offset;
 		} __attribute__ ((packed)) clonerange;
 	};
 	__le32 payload_len;
 } __attribute__ ((packed));


 #endif
	#ifndef CEPH_RADOS_H
	#define CEPH_RADOS_H

	/*
	* Data types for the Ceph distributed object storage layer RADOS
	* (Reliable Autonomic Distributed Object Store).
	*/

	#include <linux/ceph/msgr.h>

	/*
	* fs id
	*/
	struct ceph_fsid {
	unsigned char fsid[16];
	};

	static inline int ceph_fsid_compare(const struct ceph_fsid *a,
	const struct ceph_fsid *b)
	{
	return memcmp(a, b, sizeof(*a));
	}

	/*
	* ino, object, etc.
	*/
	typedef __le64 ceph_snapid_t;
	#define CEPH_SNAPDIR ((__u64)(-1)) /* reserved for hidden .snap dir */
	#define CEPH_NOSNAP ((__u64)(-2)) /* "head", "live" revision */
	#define CEPH_MAXSNAP ((__u64)(-3)) /* largest valid snapid */

	struct ceph_timespec {
	__le32 tv_sec;
	__le32 tv_nsec;
	} __attribute__ ((packed));


	/*
	* object layout - how objects are mapped into PGs
	*/
	#define CEPH_OBJECT_LAYOUT_HASH 1
	#define CEPH_OBJECT_LAYOUT_LINEAR 2
	#define CEPH_OBJECT_LAYOUT_HASHINO 3

	/*
	* pg layout -- how PGs are mapped onto (sets of) OSDs
	*/
	#define CEPH_PG_LAYOUT_CRUSH 0
	#define CEPH_PG_LAYOUT_HASH 1
	#define CEPH_PG_LAYOUT_LINEAR 2
	#define CEPH_PG_LAYOUT_HYBRID 3

	#define CEPH_PG_MAX_SIZE 16 /* max # osds in a single pg */

	/*
	* placement group.
	* we encode this into one __le64.
	*/
	struct ceph_pg_v1 {
	__le16 preferred; /* preferred primary osd */
	__le16 ps; /* placement seed */
	__le32 pool; /* object pool */
	} __attribute__ ((packed));

	/*
	* pg_pool is a set of pgs storing a pool of objects
	*
	* pg_num -- base number of pseudorandomly placed pgs
	*
	* pgp_num -- effective number when calculating pg placement. this
	* is used for pg_num increases. new pgs result in data being "split"
	* into new pgs. for this to proceed smoothly, new pgs are intiially
	* colocated with their parents; that is, pgp_num doesn't increase
	* until the new pgs have successfully split. only _then_ are the new
	* pgs placed independently.
	*
	* lpg_num -- localized pg count (per device). replicas are randomly
	* selected.
	*
	* lpgp_num -- as above.
	*/
	#define CEPH_NOPOOL ((__u64) (-1)) /* pool id not defined */

	#define CEPH_PG_TYPE_REP 1
	#define CEPH_PG_TYPE_RAID4 2

	/*
	* stable_mod func is used to control number of placement groups.
	* similar to straight-up modulo, but produces a stable mapping as b
	* increases over time. b is the number of bins, and bmask is the
	* containing power of 2 minus 1.
	*
	* b <= bmask and bmask=(2**n)-1
	* e.g., b=12 -> bmask=15, b=123 -> bmask=127
	*/
	static inline int ceph_stable_mod(int x, int b, int bmask)
	{
	if ((x & bmask) < b)
	return x & bmask;
	else
	return x & (bmask >> 1);
	}

	/*
	* object layout - how a given object should be stored.
	*/
	struct ceph_object_layout {
	struct ceph_pg_v1 ol_pgid; /* raw pg, with _full_ ps precision. */
	__le32 ol_stripe_unit; /* for per-object parity, if any */
	} __attribute__ ((packed));

	/*
	* compound epoch+version, used by storage layer to serialize mutations
	*/
	struct ceph_eversion {
	__le32 epoch;
	__le64 version;
	} __attribute__ ((packed));

	/*
	* osd map bits
	*/

	/* status bits */
	#define CEPH_OSD_EXISTS (1<<0)
	#define CEPH_OSD_UP (1<<1)
	#define CEPH_OSD_AUTOOUT (1<<2) /* osd was automatically marked out */
	#define CEPH_OSD_NEW (1<<3) /* osd is new, never marked in */

	extern const char *ceph_osd_state_name(int s);

	/* osd weights. fixed point value: 0x10000 == 1.0 ("in"), 0 == "out" */
	#define CEPH_OSD_IN 0x10000
	#define CEPH_OSD_OUT 0


	/*
	* osd map flag bits
	*/
	#define CEPH_OSDMAP_NEARFULL (1<<0) /* sync writes (near ENOSPC) */
	#define CEPH_OSDMAP_FULL (1<<1) /* no data writes (ENOSPC) */
	#define CEPH_OSDMAP_PAUSERD (1<<2) /* pause all reads */
	#define CEPH_OSDMAP_PAUSEWR (1<<3) /* pause all writes */
	#define CEPH_OSDMAP_PAUSEREC (1<<4) /* pause recovery */
	#define CEPH_OSDMAP_NOUP (1<<5) /* block osd boot */
	#define CEPH_OSDMAP_NODOWN (1<<6) /* block osd mark-down/failure */
	#define CEPH_OSDMAP_NOOUT (1<<7) /* block osd auto mark-out */
	#define CEPH_OSDMAP_NOIN (1<<8) /* block osd auto mark-in */
	#define CEPH_OSDMAP_NOBACKFILL (1<<9) /* block osd backfill */
	#define CEPH_OSDMAP_NORECOVER (1<<10) /* block osd recovery and backfill */

	/*
	* The error code to return when an OSD can't handle a write
	* because it is too large.
	*/
	#define OSD_WRITETOOBIG EMSGSIZE

	/*
	* osd ops
	*
	* WARNING: do not use these op codes directly. Use the helpers
	* defined below instead. In certain cases, op code behavior was
	* redefined, resulting in special-cases in the helpers.
	*/
	#define CEPH_OSD_OP_MODE 0xf000
	#define CEPH_OSD_OP_MODE_RD 0x1000
	#define CEPH_OSD_OP_MODE_WR 0x2000
	#define CEPH_OSD_OP_MODE_RMW 0x3000
	#define CEPH_OSD_OP_MODE_SUB 0x4000

	#define CEPH_OSD_OP_TYPE 0x0f00
	#define CEPH_OSD_OP_TYPE_LOCK 0x0100
	#define CEPH_OSD_OP_TYPE_DATA 0x0200
	#define CEPH_OSD_OP_TYPE_ATTR 0x0300
	#define CEPH_OSD_OP_TYPE_EXEC 0x0400
	#define CEPH_OSD_OP_TYPE_PG 0x0500
	#define CEPH_OSD_OP_TYPE_MULTI 0x0600 /* multiobject */

	enum {
	/ data /
	/* read */
	CEPH_OSD_OP_READ = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_DATA \| 1,
	CEPH_OSD_OP_STAT = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_DATA \| 2,
	CEPH_OSD_OP_MAPEXT = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_DATA \| 3,

	/* fancy read */
	CEPH_OSD_OP_MASKTRUNC = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_DATA \| 4,
	CEPH_OSD_OP_SPARSE_READ = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_DATA \| 5,

	CEPH_OSD_OP_NOTIFY = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_DATA \| 6,
	CEPH_OSD_OP_NOTIFY_ACK = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_DATA \| 7,

	/* versioning */
	CEPH_OSD_OP_ASSERT_VER = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_DATA \| 8,

	/* write */
	CEPH_OSD_OP_WRITE = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 1,
	CEPH_OSD_OP_WRITEFULL = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 2,
	CEPH_OSD_OP_TRUNCATE = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 3,
	CEPH_OSD_OP_ZERO = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 4,
	CEPH_OSD_OP_DELETE = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 5,

	/* fancy write */
	CEPH_OSD_OP_APPEND = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 6,
	CEPH_OSD_OP_STARTSYNC = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 7,
	CEPH_OSD_OP_SETTRUNC = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 8,
	CEPH_OSD_OP_TRIMTRUNC = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 9,

	CEPH_OSD_OP_TMAPUP = CEPH_OSD_OP_MODE_RMW \| CEPH_OSD_OP_TYPE_DATA \| 10,
	CEPH_OSD_OP_TMAPPUT = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 11,
	CEPH_OSD_OP_TMAPGET = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_DATA \| 12,

	CEPH_OSD_OP_CREATE = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 13,
	CEPH_OSD_OP_ROLLBACK= CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 14,

	CEPH_OSD_OP_WATCH = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 15,

	/* omap */
	CEPH_OSD_OP_OMAPGETKEYS = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_DATA \| 17,
	CEPH_OSD_OP_OMAPGETVALS = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_DATA \| 18,
	CEPH_OSD_OP_OMAPGETHEADER = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_DATA \| 19,
	CEPH_OSD_OP_OMAPGETVALSBYKEYS =
	CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_DATA \| 20,
	CEPH_OSD_OP_OMAPSETVALS = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 21,
	CEPH_OSD_OP_OMAPSETHEADER = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 22,
	CEPH_OSD_OP_OMAPCLEAR = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 23,
	CEPH_OSD_OP_OMAPRMKEYS = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_DATA \| 24,
	CEPH_OSD_OP_OMAP_CMP = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_DATA \| 25,

	/ multi /
	CEPH_OSD_OP_CLONERANGE = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_MULTI \| 1,
	CEPH_OSD_OP_ASSERT_SRC_VERSION = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_MULTI \| 2,
	CEPH_OSD_OP_SRC_CMPXATTR = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_MULTI \| 3,

	/ attrs /
	/* read */
	CEPH_OSD_OP_GETXATTR = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_ATTR \| 1,
	CEPH_OSD_OP_GETXATTRS = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_ATTR \| 2,
	CEPH_OSD_OP_CMPXATTR = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_ATTR \| 3,

	/* write */
	CEPH_OSD_OP_SETXATTR = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_ATTR \| 1,
	CEPH_OSD_OP_SETXATTRS = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_ATTR \| 2,
	CEPH_OSD_OP_RESETXATTRS = CEPH_OSD_OP_MODE_WR\|CEPH_OSD_OP_TYPE_ATTR \| 3,
	CEPH_OSD_OP_RMXATTR = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_ATTR \| 4,

	/ subop /
	CEPH_OSD_OP_PULL = CEPH_OSD_OP_MODE_SUB \| 1,
	CEPH_OSD_OP_PUSH = CEPH_OSD_OP_MODE_SUB \| 2,
	CEPH_OSD_OP_BALANCEREADS = CEPH_OSD_OP_MODE_SUB \| 3,
	CEPH_OSD_OP_UNBALANCEREADS = CEPH_OSD_OP_MODE_SUB \| 4,
	CEPH_OSD_OP_SCRUB = CEPH_OSD_OP_MODE_SUB \| 5,
	CEPH_OSD_OP_SCRUB_RESERVE = CEPH_OSD_OP_MODE_SUB \| 6,
	CEPH_OSD_OP_SCRUB_UNRESERVE = CEPH_OSD_OP_MODE_SUB \| 7,
	CEPH_OSD_OP_SCRUB_STOP = CEPH_OSD_OP_MODE_SUB \| 8,
	CEPH_OSD_OP_SCRUB_MAP = CEPH_OSD_OP_MODE_SUB \| 9,

	/ lock /
	CEPH_OSD_OP_WRLOCK = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_LOCK \| 1,
	CEPH_OSD_OP_WRUNLOCK = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_LOCK \| 2,
	CEPH_OSD_OP_RDLOCK = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_LOCK \| 3,
	CEPH_OSD_OP_RDUNLOCK = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_LOCK \| 4,
	CEPH_OSD_OP_UPLOCK = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_LOCK \| 5,
	CEPH_OSD_OP_DNLOCK = CEPH_OSD_OP_MODE_WR \| CEPH_OSD_OP_TYPE_LOCK \| 6,

	/ exec /
	/* note: the RD bit here is wrong; see special-case below in helper */
	CEPH_OSD_OP_CALL = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_EXEC \| 1,

	/ pg /
	CEPH_OSD_OP_PGLS = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_PG \| 1,
	CEPH_OSD_OP_PGLS_FILTER = CEPH_OSD_OP_MODE_RD \| CEPH_OSD_OP_TYPE_PG \| 2,
	};

	static inline int ceph_osd_op_type_lock(int op)
	{
	return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_LOCK;
	}
	static inline int ceph_osd_op_type_data(int op)
	{
	return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_DATA;
	}
	static inline int ceph_osd_op_type_attr(int op)
	{
	return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_ATTR;
	}
	static inline int ceph_osd_op_type_exec(int op)
	{
	return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_EXEC;
	}
	static inline int ceph_osd_op_type_pg(int op)
	{
	return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_PG;
	}
	static inline int ceph_osd_op_type_multi(int op)
	{
	return (op & CEPH_OSD_OP_TYPE) == CEPH_OSD_OP_TYPE_MULTI;
	}

	static inline int ceph_osd_op_mode_subop(int op)
	{
	return (op & CEPH_OSD_OP_MODE) == CEPH_OSD_OP_MODE_SUB;
	}
	static inline int ceph_osd_op_mode_read(int op)
	{
	return (op & CEPH_OSD_OP_MODE_RD) &&
	op != CEPH_OSD_OP_CALL;
	}
	static inline int ceph_osd_op_mode_modify(int op)
	{
	return op & CEPH_OSD_OP_MODE_WR;
	}

	/*
	* note that the following tmap stuff is also defined in the ceph librados.h
	* any modification here needs to be updated there
	*/
	#define CEPH_OSD_TMAP_HDR 'h'
	#define CEPH_OSD_TMAP_SET 's'
	#define CEPH_OSD_TMAP_CREATE 'c' /* create key */
	#define CEPH_OSD_TMAP_RM 'r'
	#define CEPH_OSD_TMAP_RMSLOPPY 'R'

	extern const char *ceph_osd_op_name(int op);

	/*
	* osd op flags
	*
	* An op may be READ, WRITE, or READ\|WRITE.
	*/
	enum {
	CEPH_OSD_FLAG_ACK = 0x0001, /* want (or is) "ack" ack */
	CEPH_OSD_FLAG_ONNVRAM = 0x0002, /* want (or is) "onnvram" ack */
	CEPH_OSD_FLAG_ONDISK = 0x0004, /* want (or is) "ondisk" ack */
	CEPH_OSD_FLAG_RETRY = 0x0008, /* resend attempt */
	CEPH_OSD_FLAG_READ = 0x0010, /* op may read */
	CEPH_OSD_FLAG_WRITE = 0x0020, /* op may write */
	CEPH_OSD_FLAG_ORDERSNAP = 0x0040, /* EOLDSNAP if snapc is out of order */
	CEPH_OSD_FLAG_PEERSTAT_OLD = 0x0080, /* DEPRECATED msg includes osd_peer_stat */
	CEPH_OSD_FLAG_BALANCE_READS = 0x0100,
	CEPH_OSD_FLAG_PARALLELEXEC = 0x0200, /* execute op in parallel */
	CEPH_OSD_FLAG_PGOP = 0x0400, /* pg op, no object */
	CEPH_OSD_FLAG_EXEC = 0x0800, /* op may exec */
	CEPH_OSD_FLAG_EXEC_PUBLIC = 0x1000, /* DEPRECATED op may exec (public) */
	CEPH_OSD_FLAG_LOCALIZE_READS = 0x2000, /* read from nearby replica, if any */
	CEPH_OSD_FLAG_RWORDERED = 0x4000, /* order wrt concurrent reads */
	CEPH_OSD_FLAG_IGNORE_CACHE = 0x8000, /* ignore cache logic */
	CEPH_OSD_FLAG_SKIPRWLOCKS = 0x10000, /* skip rw locks */
	CEPH_OSD_FLAG_IGNORE_OVERLAY = 0x20000, /* ignore pool overlay */
	CEPH_OSD_FLAG_FLUSH = 0x40000, /* this is part of flush */
	};

	enum {
	CEPH_OSD_OP_FLAG_EXCL = 1, /* EXCL object create */
	CEPH_OSD_OP_FLAG_FAILOK = 2, /* continue despite failure */
	};

	#define EOLDSNAPC ERESTART /* ORDERSNAP flag set; writer has old snapc*/
	#define EBLACKLISTED ESHUTDOWN /* blacklisted */

	/* xattr comparison */
	enum {
	CEPH_OSD_CMPXATTR_OP_NOP = 0,
	CEPH_OSD_CMPXATTR_OP_EQ = 1,
	CEPH_OSD_CMPXATTR_OP_NE = 2,
	CEPH_OSD_CMPXATTR_OP_GT = 3,
	CEPH_OSD_CMPXATTR_OP_GTE = 4,
	CEPH_OSD_CMPXATTR_OP_LT = 5,
	CEPH_OSD_CMPXATTR_OP_LTE = 6
	};

	enum {
	CEPH_OSD_CMPXATTR_MODE_STRING = 1,
	CEPH_OSD_CMPXATTR_MODE_U64 = 2
	};

	#define RADOS_NOTIFY_VER 1

	/*
	* an individual object operation. each may be accompanied by some data
	* payload
	*/
	struct ceph_osd_op {
	__le16 op; /* CEPH_OSD_OP_* */
	__le32 flags; /* CEPH_OSD_FLAG_* */
	union {
	struct {
	__le64 offset, length;
	__le64 truncate_size;
	__le32 truncate_seq;
	} __attribute__ ((packed)) extent;
	struct {
	__le32 name_len;
	__le32 value_len;
	__u8 cmp_op; /* CEPH_OSD_CMPXATTR_OP_* */
	__u8 cmp_mode; /* CEPH_OSD_CMPXATTR_MODE_* */
	} __attribute__ ((packed)) xattr;
	struct {
	__u8 class_len;
	__u8 method_len;
	__u8 argc;
	__le32 indata_len;
	} __attribute__ ((packed)) cls;
	struct {
	__le64 cookie, count;
	} __attribute__ ((packed)) pgls;
	struct {
	__le64 snapid;
	} __attribute__ ((packed)) snap;
	struct {
	__le64 cookie;
	__le64 ver;
	__u8 flag; /* 0 = unwatch, 1 = watch */
	} __attribute__ ((packed)) watch;
	struct {
	__le64 offset, length;
	__le64 src_offset;
	} __attribute__ ((packed)) clonerange;
	};
	__le32 payload_len;
	} __attribute__ ((packed));


	#endif