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/ceph_fs.h>
   7 #include <linux/crush/crush.h>
   8
   9 /*
  10  * The osd map describes the current membership of the osd cluster and
  11  * specifies the mapping of objects to placement groups and placement
  12  * groups to (sets of) osds.  That is, it completely specifies the
  13  * (desired) distribution of all data objects in the system at some
  14  * point in time.
  15  *
  16  * Each map version is identified by an epoch, which increases monotonically.
  17  *
  18  * The map can be updated either via an incremental map (diff) describing
  19  * the change between two successive epochs, or as a fully encoded map.
  20  */
  21 struct ceph_pg {
  22         uint64_t pool;
  23         uint32_t seed;
  24 };
  25
  26 struct ceph_pg_pool_info {
  27         struct rb_node node;
  28         s64 id;
  29         u8 type;
  30         u8 size;
  31         u8 crush_ruleset;
  32         u8 object_hash;
  33         u32 pg_num, pgp_num;
  34         int pg_num_mask, pgp_num_mask;
  35         u64 flags;
  36         char *name;
  37 };
  38
  39 struct ceph_object_locator {
  40         uint64_t pool;
  41         char *key;
  42 };
  43
  44 struct ceph_pg_mapping {
  45         struct rb_node node;
  46         struct ceph_pg pgid;
  47         int len;
  48         int osds[];
  49 };
  50
  51 struct ceph_osdmap {
  52         struct ceph_fsid fsid;
  53         u32 epoch;
  54         u32 mkfs_epoch;
  55         struct ceph_timespec created, modified;
  56
  57         u32 flags;         /* CEPH_OSDMAP_* */
  58
  59         u32 max_osd;       /* size of osd_state, _offload, _addr arrays */
  60         u8 *osd_state;     /* CEPH_OSD_* */
  61         u32 *osd_weight;   /* 0 = failed, 0x10000 = 100% normal */
  62         struct ceph_entity_addr *osd_addr;
  63
  64         struct rb_root pg_temp;
  65         struct rb_root pg_pools;
  66         u32 pool_max;
  67
  68         /* the CRUSH map specifies the mapping of placement groups to
  69          * the list of osds that store+replicate them. */
  70         struct crush_map *crush;
  71 };
  72
  73 /*
  74  * file layout helpers
  75  */
  76 #define ceph_file_layout_su(l) ((__s32)le32_to_cpu((l).fl_stripe_unit))
  77 #define ceph_file_layout_stripe_count(l) \
  78         ((__s32)le32_to_cpu((l).fl_stripe_count))
  79 #define ceph_file_layout_object_size(l) ((__s32)le32_to_cpu((l).fl_object_size))
  80 #define ceph_file_layout_cas_hash(l) ((__s32)le32_to_cpu((l).fl_cas_hash))
  81 #define ceph_file_layout_object_su(l) \
  82         ((__s32)le32_to_cpu((l).fl_object_stripe_unit))
  83 #define ceph_file_layout_pg_pool(l) \
  84         ((__s32)le32_to_cpu((l).fl_pg_pool))
  85
  86 static inline unsigned ceph_file_layout_stripe_width(struct ceph_file_layout *l)
  87 {
  88         return le32_to_cpu(l->fl_stripe_unit) *
  89                 le32_to_cpu(l->fl_stripe_count);
  90 }
  91
  92 /* "period" == bytes before i start on a new set of objects */
  93 static inline unsigned ceph_file_layout_period(struct ceph_file_layout *l)
  94 {
  95         return le32_to_cpu(l->fl_object_size) *
  96                 le32_to_cpu(l->fl_stripe_count);
  97 }
  98
  99
 100 static inline int ceph_osd_is_up(struct ceph_osdmap *map, int osd)
 101 {
 102         return (osd < map->max_osd) && (map->osd_state[osd] & CEPH_OSD_UP);
 103 }
 104
 105 static inline bool ceph_osdmap_flag(struct ceph_osdmap *map, int flag)
 106 {
 107         return map && (map->flags & flag);
 108 }
 109
 110 extern char *ceph_osdmap_state_str(char *str, int len, int state);
 111
 112 static inline struct ceph_entity_addr *ceph_osd_addr(struct ceph_osdmap *map,
 113                                                      int osd)
 114 {
 115         if (osd >= map->max_osd)
 116                 return NULL;
 117         return &map->osd_addr[osd];
 118 }
 119
 120 extern struct ceph_osdmap *osdmap_decode(void **p, void *end);
 121 extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 122                                             struct ceph_osdmap *map,
 123                                             struct ceph_messenger *msgr);
 124 extern void ceph_osdmap_destroy(struct ceph_osdmap *map);
 125
 126 /* calculate mapping of a file extent to an object */
 127 extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
 128                                          u64 off, u64 len,
 129                                          u64 *bno, u64 *oxoff, u64 *oxlen);
 130
 131 /* calculate mapping of object to a placement group */
 132 extern int ceph_calc_object_layout(struct ceph_pg *pg,
 133                                    const char *oid,
 134                                    struct ceph_file_layout *fl,
 135                                    struct ceph_osdmap *osdmap);
 136 extern int ceph_calc_pg_acting(struct ceph_osdmap *osdmap,
 137                                struct ceph_pg pgid,
 138                                int *acting);
 139 extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap,
 140                                 struct ceph_pg pgid);
 141
 142 extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id);
 143 extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name);
 144
 145 #endif