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Linux/include/linux/ceph/osdmap.h

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  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_pool_info {
 22         struct rb_node node;
 23         int id;
 24         struct ceph_pg_pool v;
 25         int pg_num_mask, pgp_num_mask, lpg_num_mask, lpgp_num_mask;
 26         char *name;
 27 };
 28 
 29 struct ceph_pg_mapping {
 30         struct rb_node node;
 31         struct ceph_pg pgid;
 32         int len;
 33         int osds[];
 34 };
 35 
 36 struct ceph_osdmap {
 37         struct ceph_fsid fsid;
 38         u32 epoch;
 39         u32 mkfs_epoch;
 40         struct ceph_timespec created, modified;
 41 
 42         u32 flags;         /* CEPH_OSDMAP_* */
 43 
 44         u32 max_osd;       /* size of osd_state, _offload, _addr arrays */
 45         u8 *osd_state;     /* CEPH_OSD_* */
 46         u32 *osd_weight;   /* 0 = failed, 0x10000 = 100% normal */
 47         struct ceph_entity_addr *osd_addr;
 48 
 49         struct rb_root pg_temp;
 50         struct rb_root pg_pools;
 51         u32 pool_max;
 52 
 53         /* the CRUSH map specifies the mapping of placement groups to
 54          * the list of osds that store+replicate them. */
 55         struct crush_map *crush;
 56 };
 57 
 58 /*
 59  * file layout helpers
 60  */
 61 #define ceph_file_layout_su(l) ((__s32)le32_to_cpu((l).fl_stripe_unit))
 62 #define ceph_file_layout_stripe_count(l) \
 63         ((__s32)le32_to_cpu((l).fl_stripe_count))
 64 #define ceph_file_layout_object_size(l) ((__s32)le32_to_cpu((l).fl_object_size))
 65 #define ceph_file_layout_cas_hash(l) ((__s32)le32_to_cpu((l).fl_cas_hash))
 66 #define ceph_file_layout_object_su(l) \
 67         ((__s32)le32_to_cpu((l).fl_object_stripe_unit))
 68 #define ceph_file_layout_pg_pool(l) \
 69         ((__s32)le32_to_cpu((l).fl_pg_pool))
 70 
 71 static inline unsigned ceph_file_layout_stripe_width(struct ceph_file_layout *l)
 72 {
 73         return le32_to_cpu(l->fl_stripe_unit) *
 74                 le32_to_cpu(l->fl_stripe_count);
 75 }
 76 
 77 /* "period" == bytes before i start on a new set of objects */
 78 static inline unsigned ceph_file_layout_period(struct ceph_file_layout *l)
 79 {
 80         return le32_to_cpu(l->fl_object_size) *
 81                 le32_to_cpu(l->fl_stripe_count);
 82 }
 83 
 84 
 85 static inline int ceph_osd_is_up(struct ceph_osdmap *map, int osd)
 86 {
 87         return (osd < map->max_osd) && (map->osd_state[osd] & CEPH_OSD_UP);
 88 }
 89 
 90 static inline bool ceph_osdmap_flag(struct ceph_osdmap *map, int flag)
 91 {
 92         return map && (map->flags & flag);
 93 }
 94 
 95 extern char *ceph_osdmap_state_str(char *str, int len, int state);
 96 
 97 static inline struct ceph_entity_addr *ceph_osd_addr(struct ceph_osdmap *map,
 98                                                      int osd)
 99 {
100         if (osd >= map->max_osd)
101                 return NULL;
102         return &map->osd_addr[osd];
103 }
104 
105 extern struct ceph_osdmap *osdmap_decode(void **p, void *end);
106 extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
107                                             struct ceph_osdmap *map,
108                                             struct ceph_messenger *msgr);
109 extern void ceph_osdmap_destroy(struct ceph_osdmap *map);
110 
111 /* calculate mapping of a file extent to an object */
112 extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
113                                          u64 off, u64 *plen,
114                                          u64 *bno, u64 *oxoff, u64 *oxlen);
115 
116 /* calculate mapping of object to a placement group */
117 extern int ceph_calc_object_layout(struct ceph_object_layout *ol,
118                                    const char *oid,
119                                    struct ceph_file_layout *fl,
120                                    struct ceph_osdmap *osdmap);
121 extern int ceph_calc_pg_acting(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
122                                int *acting);
123 extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap,
124                                 struct ceph_pg pgid);
125 
126 extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id);
127 extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name);
128 
129 #endif
130 

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