#ifndef _FS_CEPH_OSDMAP_H#define _FS_CEPH_OSDMAP_H #include <linux/rbtree.h>#include <linux/ceph/types.h>#include <linux/ceph/decode.h>#include <linux/ceph/ceph_fs.h>#include <linux/crush/crush.h> /* * The osd map describes the current membership of the osd cluster and * specifies the mapping of objects to placement groups and placement * groups to (sets of) osds.  That is, it completely specifies the * (desired) distribution of all data objects in the system at some * point in time. * * Each map version is identified by an epoch, which increases monotonically. * * The map can be updated either via an incremental map (diff) describing * the change between two successive epochs, or as a fully encoded map. */struct ceph_pg {	uint64_t pool;	uint32_t seed;}; #define CEPH_POOL_FLAG_HASHPSPOOL  1 struct ceph_pg_pool_info {	struct rb_node node;	s64 id;	u8 type;	u8 size;	u8 crush_ruleset;	u8 object_hash;	u32 pg_num, pgp_num;	int pg_num_mask, pgp_num_mask;	s64 read_tier;	s64 write_tier; /* wins for read+write ops */	u64 flags;	char *name;}; struct ceph_object_locator {	s64 pool;}; /* * Maximum supported by kernel client object name length * * (probably outdated: must be >= RBD_MAX_MD_NAME_LEN -- currently 100) */#define CEPH_MAX_OID_NAME_LEN 100 struct ceph_object_id {	char name[CEPH_MAX_OID_NAME_LEN];	int name_len;}; struct ceph_pg_mapping {	struct rb_node node;	struct ceph_pg pgid;	int len;	int osds[];}; struct ceph_osdmap {	struct ceph_fsid fsid;	u32 epoch;	u32 mkfs_epoch;	struct ceph_timespec created, modified; 	u32 flags;         /* CEPH_OSDMAP_* */ 	u32 max_osd;       /* size of osd_state, _offload, _addr arrays */	u8 *osd_state;     /* CEPH_OSD_* */	u32 *osd_weight;   /* 0 = failed, 0x10000 = 100% normal */	struct ceph_entity_addr *osd_addr; 	struct rb_root pg_temp;	struct rb_root pg_pools;	u32 pool_max; 	/* the CRUSH map specifies the mapping of placement groups to	 * the list of osds that store+replicate them. */	struct crush_map *crush;}; static inline void ceph_oid_set_name(struct ceph_object_id *oid,				     const char *name){	int len; 	len = strlen(name);	if (len > sizeof(oid->name)) {		WARN(1, "ceph_oid_set_name '%s' len %d vs %zu, truncating\n",		     name, len, sizeof(oid->name));		len = sizeof(oid->name);	} 	memcpy(oid->name, name, len);	oid->name_len = len;} static inline void ceph_oid_copy(struct ceph_object_id *dest,				 struct ceph_object_id *src){	BUG_ON(src->name_len > sizeof(dest->name));	memcpy(dest->name, src->name, src->name_len);	dest->name_len = src->name_len;} static inline int ceph_osd_is_up(struct ceph_osdmap *map, int osd){	return (osd < map->max_osd) && (map->osd_state[osd] & CEPH_OSD_UP);} static inline bool ceph_osdmap_flag(struct ceph_osdmap *map, int flag){	return map && (map->flags & flag);} extern char *ceph_osdmap_state_str(char *str, int len, int state); static inline struct ceph_entity_addr *ceph_osd_addr(struct ceph_osdmap *map,						     int osd){	if (osd >= map->max_osd)		return NULL;	return &map->osd_addr[osd];} static inline int ceph_decode_pgid(void **p, void *end, struct ceph_pg *pgid){	__u8 version; 	if (!ceph_has_room(p, end, 1 + 8 + 4 + 4)) {		pr_warning("incomplete pg encoding"); 		return -EINVAL;	}	version = ceph_decode_8(p);	if (version > 1) {		pr_warning("do not understand pg encoding %d > 1",			(int)version);		return -EINVAL;	} 	pgid->pool = ceph_decode_64(p);	pgid->seed = ceph_decode_32(p);	*p += 4;	/* skip deprecated preferred value */ 	return 0;} extern struct ceph_osdmap *osdmap_decode(void **p, void *end);extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,					    struct ceph_osdmap *map,					    struct ceph_messenger *msgr);extern void ceph_osdmap_destroy(struct ceph_osdmap *map); /* calculate mapping of a file extent to an object */extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,					 u64 off, u64 len,					 u64 *bno, u64 *oxoff, u64 *oxlen); /* calculate mapping of object to a placement group */extern int ceph_oloc_oid_to_pg(struct ceph_osdmap *osdmap,			       struct ceph_object_locator *oloc,			       struct ceph_object_id *oid,			       struct ceph_pg *pg_out); extern int ceph_calc_pg_acting(struct ceph_osdmap *osdmap,			       struct ceph_pg pgid,			       int *acting);extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap,				struct ceph_pg pgid); extern struct ceph_pg_pool_info *ceph_pg_pool_by_id(struct ceph_osdmap *map,						    u64 id); extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id);extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name); #endif