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 u64 flags; 39 char *name; 40 }; 41 42 struct ceph_object_locator { 43 uint64_t pool; 44 char *key; 45 }; 46 47 struct ceph_pg_mapping { 48 struct rb_node node; 49 struct ceph_pg pgid; 50 int len; 51 int osds[]; 52 }; 53 54 struct ceph_osdmap { 55 struct ceph_fsid fsid; 56 u32 epoch; 57 u32 mkfs_epoch; 58 struct ceph_timespec created, modified; 59 60 u32 flags; /* CEPH_OSDMAP_* */ 61 62 u32 max_osd; /* size of osd_state, _offload, _addr arrays */ 63 u8 *osd_state; /* CEPH_OSD_* */ 64 u32 *osd_weight; /* 0 = failed, 0x10000 = 100% normal */ 65 struct ceph_entity_addr *osd_addr; 66 67 struct rb_root pg_temp; 68 struct rb_root pg_pools; 69 u32 pool_max; 70 71 /* the CRUSH map specifies the mapping of placement groups to 72 * the list of osds that store+replicate them. */ 73 struct crush_map *crush; 74 }; 75 76 /* 77 * file layout helpers 78 */ 79 #define ceph_file_layout_su(l) ((__s32)le32_to_cpu((l).fl_stripe_unit)) 80 #define ceph_file_layout_stripe_count(l) \ 81 ((__s32)le32_to_cpu((l).fl_stripe_count)) 82 #define ceph_file_layout_object_size(l) ((__s32)le32_to_cpu((l).fl_object_size)) 83 #define ceph_file_layout_cas_hash(l) ((__s32)le32_to_cpu((l).fl_cas_hash)) 84 #define ceph_file_layout_object_su(l) \ 85 ((__s32)le32_to_cpu((l).fl_object_stripe_unit)) 86 #define ceph_file_layout_pg_pool(l) \ 87 ((__s32)le32_to_cpu((l).fl_pg_pool)) 88 89 static inline unsigned ceph_file_layout_stripe_width(struct ceph_file_layout *l) 90 { 91 return le32_to_cpu(l->fl_stripe_unit) * 92 le32_to_cpu(l->fl_stripe_count); 93 } 94 95 /* "period" == bytes before i start on a new set of objects */ 96 static inline unsigned ceph_file_layout_period(struct ceph_file_layout *l) 97 { 98 return le32_to_cpu(l->fl_object_size) * 99 le32_to_cpu(l->fl_stripe_count); 100 } 101 102 103 static inline int ceph_osd_is_up(struct ceph_osdmap *map, int osd) 104 { 105 return (osd < map->max_osd) && (map->osd_state[osd] & CEPH_OSD_UP); 106 } 107 108 static inline bool ceph_osdmap_flag(struct ceph_osdmap *map, int flag) 109 { 110 return map && (map->flags & flag); 111 } 112 113 extern char *ceph_osdmap_state_str(char *str, int len, int state); 114 115 static inline struct ceph_entity_addr *ceph_osd_addr(struct ceph_osdmap *map, 116 int osd) 117 { 118 if (osd >= map->max_osd) 119 return NULL; 120 return &map->osd_addr[osd]; 121 } 122 123 static inline int ceph_decode_pgid(void **p, void *end, struct ceph_pg *pgid) 124 { 125 __u8 version; 126 127 if (!ceph_has_room(p, end, 1 + 8 + 4 + 4)) { 128 pr_warning("incomplete pg encoding"); 129 130 return -EINVAL; 131 } 132 version = ceph_decode_8(p); 133 if (version > 1) { 134 pr_warning("do not understand pg encoding %d > 1", 135 (int)version); 136 return -EINVAL; 137 } 138 139 pgid->pool = ceph_decode_64(p); 140 pgid->seed = ceph_decode_32(p); 141 *p += 4; /* skip deprecated preferred value */ 142 143 return 0; 144 } 145 146 extern struct ceph_osdmap *osdmap_decode(void **p, void *end); 147 extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, 148 struct ceph_osdmap *map, 149 struct ceph_messenger *msgr); 150 extern void ceph_osdmap_destroy(struct ceph_osdmap *map); 151 152 /* calculate mapping of a file extent to an object */ 153 extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout, 154 u64 off, u64 len, 155 u64 *bno, u64 *oxoff, u64 *oxlen); 156 157 /* calculate mapping of object to a placement group */ 158 extern int ceph_calc_ceph_pg(struct ceph_pg *pg, const char *oid, 159 struct ceph_osdmap *osdmap, uint64_t pool); 160 extern int ceph_calc_pg_acting(struct ceph_osdmap *osdmap, 161 struct ceph_pg pgid, 162 int *acting); 163 extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap, 164 struct ceph_pg pgid); 165 166 extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id); 167 extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name); 168 169 #endif 170