LXR linux/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 */
  22struct ceph_pg {
  23        uint64_t pool;
  24        uint32_t seed;
  25};
  26
  27#define CEPH_POOL_FLAG_HASHPSPOOL  1
  28
  29struct 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
  44static 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
  56struct 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  63 * (probably outdated: must be 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
  67struct ceph_object_id {
  68        char name[CEPH_MAX_OID_NAME_LEN];
  69        int name_len;
  70};
  71
  72struct 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
  87struct 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
 116static 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
 132static 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
 140static 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
 146static 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
 152static inline int ceph_osd_is_down(struct ceph_osdmap *map, int osd)
 153{
 154        return !ceph_osd_is_up(map, osd);
 155}
 156
 157static inline bool ceph_osdmap_flag(struct ceph_osdmap *map, int flag)
 158{
 159        return map && (map->flags & flag);
 160}
 161
 162extern char *ceph_osdmap_state_str(char *str, int len, int state);
 163extern u32 ceph_get_primary_affinity(struct ceph_osdmap *map, int osd);
 164
 165static 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
 173static 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
 195extern struct ceph_osdmap *ceph_osdmap_decode(void **p, void *end);
 196extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 197                                            struct ceph_osdmap *map,
 198                                            struct ceph_messenger *msgr);
 199extern void ceph_osdmap_destroy(struct ceph_osdmap *map);
 200
 201/* calculate mapping of a file extent to an object */
 202extern 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 */
 207extern 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
 212extern int ceph_calc_pg_acting(struct ceph_osdmap *osdmap,
 213                               struct ceph_pg pgid,
 214                               int *osds, int *primary);
 215extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap,
 216                                struct ceph_pg pgid);
 217
 218extern struct ceph_pg_pool_info *ceph_pg_pool_by_id(struct ceph_osdmap *map,
 219                                                    u64 id);
 220
 221extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id);
 222extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name);
 223
 224#endif
 225