1 #ifndef _FS_CEPH_OSDMAP_H 2 #define _FS_CEPH_OSDMAP_H 3 4 #include <linux/rbtree.h> 5 #include <linux/ceph/types.h> 6 #include <linux/ceph/decode.h> 7 #include <linux/ceph/ceph_fs.h> 8 #include <linux/crush/crush.h> 9 10 /* 11 * The osd map describes the current membership of the osd cluster and 12 * specifies the mapping of objects to placement groups and placement 13 * groups to (sets of) osds. That is, it completely specifies the 14 * (desired) distribution of all data objects in the system at some 15 * point in time. 16 * 17 * Each map version is identified by an epoch, which increases monotonically. 18 * 19 * The map can be updated either via an incremental map (diff) describing 20 * the change between two successive epochs, or as a fully encoded map. 21 */ 22 struct ceph_pg { 23 uint64_t pool; 24 uint32_t seed; 25 }; 26 27 #define CEPH_POOL_FLAG_HASHPSPOOL 1 28 29 struct ceph_pg_pool_info { 30 struct rb_node node; 31 s64 id; 32 u8 type; 33 u8 size; 34 u8 crush_ruleset; 35 u8 object_hash; 36 u32 pg_num, pgp_num; 37 int pg_num_mask, pgp_num_mask; 38 s64 read_tier; 39 s64 write_tier; /* wins for read+write ops */ 40 u64 flags; 41 char *name; 42 }; 43 44 struct ceph_object_locator { 45 s64 pool; 46 }; 47 48 /* 49 * Maximum supported by kernel client object name length 50 * 51 * (probably outdated: must be >= RBD_MAX_MD_NAME_LEN -- currently 100) 52 */ 53 #define CEPH_MAX_OID_NAME_LEN 100 54 55 struct ceph_object_id { 56 char name[CEPH_MAX_OID_NAME_LEN]; 57 int name_len; 58 }; 59 60 struct ceph_pg_mapping { 61 struct rb_node node; 62 struct ceph_pg pgid; 63 int len; 64 int osds[]; 65 }; 66 67 struct ceph_osdmap { 68 struct ceph_fsid fsid; 69 u32 epoch; 70 u32 mkfs_epoch; 71 struct ceph_timespec created, modified; 72 73 u32 flags; /* CEPH_OSDMAP_* */ 74 75 u32 max_osd; /* size of osd_state, _offload, _addr arrays */ 76 u8 *osd_state; /* CEPH_OSD_* */ 77 u32 *osd_weight; /* 0 = failed, 0x10000 = 100% normal */ 78 struct ceph_entity_addr *osd_addr; 79 80 struct rb_root pg_temp; 81 struct rb_root pg_pools; 82 u32 pool_max; 83 84 /* the CRUSH map specifies the mapping of placement groups to 85 * the list of osds that store+replicate them. */ 86 struct crush_map *crush; 87 }; 88 89 static inline void ceph_oid_set_name(struct ceph_object_id *oid, 90 const char *name) 91 { 92 int len; 93 94 len = strlen(name); 95 if (len > sizeof(oid->name)) { 96 WARN(1, "ceph_oid_set_name '%s' len %d vs %zu, truncating\n", 97 name, len, sizeof(oid->name)); 98 len = sizeof(oid->name); 99 } 100 101 memcpy(oid->name, name, len); 102 oid->name_len = len; 103 } 104 105 static inline void ceph_oid_copy(struct ceph_object_id *dest, 106 struct ceph_object_id *src) 107 { 108 BUG_ON(src->name_len > sizeof(dest->name)); 109 memcpy(dest->name, src->name, src->name_len); 110 dest->name_len = src->name_len; 111 } 112 113 static inline int ceph_osd_is_up(struct ceph_osdmap *map, int osd) 114 { 115 return (osd < map->max_osd) && (map->osd_state[osd] & CEPH_OSD_UP); 116 } 117 118 static inline bool ceph_osdmap_flag(struct ceph_osdmap *map, int flag) 119 { 120 return map && (map->flags & flag); 121 } 122 123 extern char *ceph_osdmap_state_str(char *str, int len, int state); 124 125 static inline struct ceph_entity_addr *ceph_osd_addr(struct ceph_osdmap *map, 126 int osd) 127 { 128 if (osd >= map->max_osd) 129 return NULL; 130 return &map->osd_addr[osd]; 131 } 132 133 static inline int ceph_decode_pgid(void **p, void *end, struct ceph_pg *pgid) 134 { 135 __u8 version; 136 137 if (!ceph_has_room(p, end, 1 + 8 + 4 + 4)) { 138 pr_warning("incomplete pg encoding"); 139 140 return -EINVAL; 141 } 142 version = ceph_decode_8(p); 143 if (version > 1) { 144 pr_warning("do not understand pg encoding %d > 1", 145 (int)version); 146 return -EINVAL; 147 } 148 149 pgid->pool = ceph_decode_64(p); 150 pgid->seed = ceph_decode_32(p); 151 *p += 4; /* skip deprecated preferred value */ 152 153 return 0; 154 } 155 156 extern struct ceph_osdmap *osdmap_decode(void **p, void *end); 157 extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, 158 struct ceph_osdmap *map, 159 struct ceph_messenger *msgr); 160 extern void ceph_osdmap_destroy(struct ceph_osdmap *map); 161 162 /* calculate mapping of a file extent to an object */ 163 extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout, 164 u64 off, u64 len, 165 u64 *bno, u64 *oxoff, u64 *oxlen); 166 167 /* calculate mapping of object to a placement group */ 168 extern int ceph_oloc_oid_to_pg(struct ceph_osdmap *osdmap, 169 struct ceph_object_locator *oloc, 170 struct ceph_object_id *oid, 171 struct ceph_pg *pg_out); 172 173 extern int ceph_calc_pg_acting(struct ceph_osdmap *osdmap, 174 struct ceph_pg pgid, 175 int *acting); 176 extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap, 177 struct ceph_pg pgid); 178 179 extern struct ceph_pg_pool_info *ceph_pg_pool_by_id(struct ceph_osdmap *map, 180 u64 id); 181 182 extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id); 183 extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name); 184 185 #endif 186