include/linux/ceph/osdmap.h

   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 static inline bool ceph_can_shift_osds(struct ceph_pg_pool_info *pool)
  45 {
  46         switch (pool->type) {
  47         case CEPH_POOL_TYPE_REP:
  48                 return true;
  49         case CEPH_POOL_TYPE_EC:
  50                 return false;
  51         default:
  52                 BUG_ON(1);
  53         }
  54 }
  55
  56 struct ceph_object_locator {
  57         s64 pool;
  58 };
  59
  60 /*
  61  * Maximum supported by kernel client object name length
  62  *
  63  * (probably outdated: must be >= RBD_MAX_MD_NAME_LEN -- currently 100)
  64  */
  65 #define CEPH_MAX_OID_NAME_LEN 100
  66
  67 struct ceph_object_id {
  68         char name[CEPH_MAX_OID_NAME_LEN];
  69         int name_len;
  70 };
  71
  72 struct ceph_pg_mapping {
  73         struct rb_node node;
  74         struct ceph_pg pgid;
  75
  76         union {
  77                 struct {
  78                         int len;
  79                         int osds[];
  80                 } pg_temp;
  81                 struct {
  82                         int osd;
  83                 } primary_temp;
  84         };
  85 };
  86
  87 struct ceph_osdmap {
  88         struct ceph_fsid fsid;
  89         u32 epoch;
  90         u32 mkfs_epoch;
  91         struct ceph_timespec created, modified;
  92
  93         u32 flags;         /* CEPH_OSDMAP_* */
  94
  95         u32 max_osd;       /* size of osd_state, _offload, _addr arrays */
  96         u8 *osd_state;     /* CEPH_OSD_* */
  97         u32 *osd_weight;   /* 0 = failed, 0x10000 = 100% normal */
  98         struct ceph_entity_addr *osd_addr;
  99
 100         struct rb_root pg_temp;
 101         struct rb_root primary_temp;
 102
 103         u32 *osd_primary_affinity;
 104
 105         struct rb_root pg_pools;
 106         u32 pool_max;
 107
 108         /* the CRUSH map specifies the mapping of placement groups to
 109          * the list of osds that store+replicate them. */
 110         struct crush_map *crush;
 111
 112         struct mutex crush_scratch_mutex;
 113         int crush_scratch_ary[CEPH_PG_MAX_SIZE * 3];
 114 };
 115
 116 static inline void ceph_oid_set_name(struct ceph_object_id *oid,
 117                                      const char *name)
 118 {
 119         int len;
 120
 121         len = strlen(name);
 122         if (len > sizeof(oid->name)) {
 123                 WARN(1, "ceph_oid_set_name '%s' len %d vs %zu, truncating\n",
 124                      name, len, sizeof(oid->name));
 125                 len = sizeof(oid->name);
 126         }
 127
 128         memcpy(oid->name, name, len);
 129         oid->name_len = len;
 130 }
 131
 132 static inline void ceph_oid_copy(struct ceph_object_id *dest,
 133                                  struct ceph_object_id *src)
 134 {
 135         BUG_ON(src->name_len > sizeof(dest->name));
 136         memcpy(dest->name, src->name, src->name_len);
 137         dest->name_len = src->name_len;
 138 }
 139
 140 static inline int ceph_osd_exists(struct ceph_osdmap *map, int osd)
 141 {
 142         return osd >= 0 && osd < map->max_osd &&
 143                (map->osd_state[osd] & CEPH_OSD_EXISTS);
 144 }
 145
 146 static inline int ceph_osd_is_up(struct ceph_osdmap *map, int osd)
 147 {
 148         return ceph_osd_exists(map, osd) &&
 149                (map->osd_state[osd] & CEPH_OSD_UP);
 150 }
 151
 152 static inline int ceph_osd_is_down(struct ceph_osdmap *map, int osd)
 153 {
 154         return !ceph_osd_is_up(map, osd);
 155 }
 156
 157 static inline bool ceph_osdmap_flag(struct ceph_osdmap *map, int flag)
 158 {
 159         return map && (map->flags & flag);
 160 }
 161
 162 extern char *ceph_osdmap_state_str(char *str, int len, int state);
 163 extern u32 ceph_get_primary_affinity(struct ceph_osdmap *map, int osd);
 164
 165 static inline struct ceph_entity_addr *ceph_osd_addr(struct ceph_osdmap *map,
 166                                                      int osd)
 167 {
 168         if (osd >= map->max_osd)
 169                 return NULL;
 170         return &map->osd_addr[osd];
 171 }
 172
 173 static inline int ceph_decode_pgid(void **p, void *end, struct ceph_pg *pgid)
 174 {
 175         __u8 version;
 176
 177         if (!ceph_has_room(p, end, 1 + 8 + 4 + 4)) {
 178                 pr_warn("incomplete pg encoding\n");
 179                 return -EINVAL;
 180         }
 181         version = ceph_decode_8(p);
 182         if (version > 1) {
 183                 pr_warn("do not understand pg encoding %d > 1\n",
 184                         (int)version);
 185                 return -EINVAL;
 186         }
 187
 188         pgid->pool = ceph_decode_64(p);
 189         pgid->seed = ceph_decode_32(p);
 190         *p += 4;        /* skip deprecated preferred value */
 191
 192         return 0;
 193 }
 194
 195 extern struct ceph_osdmap *ceph_osdmap_decode(void **p, void *end);
 196 extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 197                                             struct ceph_osdmap *map,
 198                                             struct ceph_messenger *msgr);
 199 extern void ceph_osdmap_destroy(struct ceph_osdmap *map);
 200
 201 /* calculate mapping of a file extent to an object */
 202 extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
 203                                          u64 off, u64 len,
 204                                          u64 *bno, u64 *oxoff, u64 *oxlen);
 205
 206 /* calculate mapping of object to a placement group */
 207 extern int ceph_oloc_oid_to_pg(struct ceph_osdmap *osdmap,
 208                                struct ceph_object_locator *oloc,
 209                                struct ceph_object_id *oid,
 210                                struct ceph_pg *pg_out);
 211
 212 extern int ceph_calc_pg_acting(struct ceph_osdmap *osdmap,
 213                                struct ceph_pg pgid,
 214                                int *osds, int *primary);
 215 extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap,
 216                                 struct ceph_pg pgid);
 217
 218 extern struct ceph_pg_pool_info *ceph_pg_pool_by_id(struct ceph_osdmap *map,
 219                                                     u64 id);
 220
 221 extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id);
 222 extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name);
 223
 224 #endif