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 int ceph_pg_compare(const struct ceph_pg *lhs, const struct ceph_pg *rhs);
  28
  29 #define CEPH_POOL_FLAG_HASHPSPOOL       (1ULL << 0) /* hash pg seed and pool id
  30                                                        together */
  31 #define CEPH_POOL_FLAG_FULL             (1ULL << 1) /* pool is full */
  32
  33 struct ceph_pg_pool_info {
  34         struct rb_node node;
  35         s64 id;
  36         u8 type; /* CEPH_POOL_TYPE_* */
  37         u8 size;
  38         u8 min_size;
  39         u8 crush_ruleset;
  40         u8 object_hash;
  41         u32 last_force_request_resend;
  42         u32 pg_num, pgp_num;
  43         int pg_num_mask, pgp_num_mask;
  44         s64 read_tier;
  45         s64 write_tier; /* wins for read+write ops */
  46         u64 flags; /* CEPH_POOL_FLAG_* */
  47         char *name;
  48
  49         bool was_full;  /* for handle_one_map() */
  50 };
  51
  52 static inline bool ceph_can_shift_osds(struct ceph_pg_pool_info *pool)
  53 {
  54         switch (pool->type) {
  55         case CEPH_POOL_TYPE_REP:
  56                 return true;
  57         case CEPH_POOL_TYPE_EC:
  58                 return false;
  59         default:
  60                 BUG_ON(1);
  61         }
  62 }
  63
  64 struct ceph_object_locator {
  65         s64 pool;
  66 };
  67
  68 static inline void ceph_oloc_init(struct ceph_object_locator *oloc)
  69 {
  70         oloc->pool = -1;
  71 }
  72
  73 static inline bool ceph_oloc_empty(const struct ceph_object_locator *oloc)
  74 {
  75         return oloc->pool == -1;
  76 }
  77
  78 static inline void ceph_oloc_copy(struct ceph_object_locator *dest,
  79                                   const struct ceph_object_locator *src)
  80 {
  81         dest->pool = src->pool;
  82 }
  83
  84 /*
  85  * Maximum supported by kernel client object name length
  86  *
  87  * (probably outdated: must be >= RBD_MAX_MD_NAME_LEN -- currently 100)
  88  */
  89 #define CEPH_MAX_OID_NAME_LEN 100
  90
  91 /*
  92  * 51-char inline_name is long enough for all cephfs and all but one
  93  * rbd requests: <imgname> in "<imgname>.rbd"/"rbd_id.<imgname>" can be
  94  * arbitrarily long (~PAGE_SIZE).  It's done once during rbd map; all
  95  * other rbd requests fit into inline_name.
  96  *
  97  * Makes ceph_object_id 64 bytes on 64-bit.
  98  */
  99 #define CEPH_OID_INLINE_LEN 52
 100
 101 /*
 102  * Both inline and external buffers have space for a NUL-terminator,
 103  * which is carried around.  It's not required though - RADOS object
 104  * names don't have to be NUL-terminated and may contain NULs.
 105  */
 106 struct ceph_object_id {
 107         char *name;
 108         char inline_name[CEPH_OID_INLINE_LEN];
 109         int name_len;
 110 };
 111
 112 static inline void ceph_oid_init(struct ceph_object_id *oid)
 113 {
 114         oid->name = oid->inline_name;
 115         oid->name_len = 0;
 116 }
 117
 118 static inline bool ceph_oid_empty(const struct ceph_object_id *oid)
 119 {
 120         return oid->name == oid->inline_name && !oid->name_len;
 121 }
 122
 123 void ceph_oid_copy(struct ceph_object_id *dest,
 124                    const struct ceph_object_id *src);
 125 __printf(2, 3)
 126 void ceph_oid_printf(struct ceph_object_id *oid, const char *fmt, ...);
 127 __printf(3, 4)
 128 int ceph_oid_aprintf(struct ceph_object_id *oid, gfp_t gfp,
 129                      const char *fmt, ...);
 130 void ceph_oid_destroy(struct ceph_object_id *oid);
 131
 132 struct ceph_pg_mapping {
 133         struct rb_node node;
 134         struct ceph_pg pgid;
 135
 136         union {
 137                 struct {
 138                         int len;
 139                         int osds[];
 140                 } pg_temp;
 141                 struct {
 142                         int osd;
 143                 } primary_temp;
 144         };
 145 };
 146
 147 struct ceph_osdmap {
 148         struct ceph_fsid fsid;
 149         u32 epoch;
 150         struct ceph_timespec created, modified;
 151
 152         u32 flags;         /* CEPH_OSDMAP_* */
 153
 154         u32 max_osd;       /* size of osd_state, _offload, _addr arrays */
 155         u8 *osd_state;     /* CEPH_OSD_* */
 156         u32 *osd_weight;   /* 0 = failed, 0x10000 = 100% normal */
 157         struct ceph_entity_addr *osd_addr;
 158
 159         struct rb_root pg_temp;
 160         struct rb_root primary_temp;
 161
 162         u32 *osd_primary_affinity;
 163
 164         struct rb_root pg_pools;
 165         u32 pool_max;
 166
 167         /* the CRUSH map specifies the mapping of placement groups to
 168          * the list of osds that store+replicate them. */
 169         struct crush_map *crush;
 170
 171         struct mutex crush_scratch_mutex;
 172         int crush_scratch_ary[CEPH_PG_MAX_SIZE * 3];
 173 };
 174
 175 static inline bool ceph_osd_exists(struct ceph_osdmap *map, int osd)
 176 {
 177         return osd >= 0 && osd < map->max_osd &&
 178                (map->osd_state[osd] & CEPH_OSD_EXISTS);
 179 }
 180
 181 static inline bool ceph_osd_is_up(struct ceph_osdmap *map, int osd)
 182 {
 183         return ceph_osd_exists(map, osd) &&
 184                (map->osd_state[osd] & CEPH_OSD_UP);
 185 }
 186
 187 static inline bool ceph_osd_is_down(struct ceph_osdmap *map, int osd)
 188 {
 189         return !ceph_osd_is_up(map, osd);
 190 }
 191
 192 extern char *ceph_osdmap_state_str(char *str, int len, int state);
 193 extern u32 ceph_get_primary_affinity(struct ceph_osdmap *map, int osd);
 194
 195 static inline struct ceph_entity_addr *ceph_osd_addr(struct ceph_osdmap *map,
 196                                                      int osd)
 197 {
 198         if (osd >= map->max_osd)
 199                 return NULL;
 200         return &map->osd_addr[osd];
 201 }
 202
 203 static inline int ceph_decode_pgid(void **p, void *end, struct ceph_pg *pgid)
 204 {
 205         __u8 version;
 206
 207         if (!ceph_has_room(p, end, 1 + 8 + 4 + 4)) {
 208                 pr_warn("incomplete pg encoding\n");
 209                 return -EINVAL;
 210         }
 211         version = ceph_decode_8(p);
 212         if (version > 1) {
 213                 pr_warn("do not understand pg encoding %d > 1\n",
 214                         (int)version);
 215                 return -EINVAL;
 216         }
 217
 218         pgid->pool = ceph_decode_64(p);
 219         pgid->seed = ceph_decode_32(p);
 220         *p += 4;        /* skip deprecated preferred value */
 221
 222         return 0;
 223 }
 224
 225 struct ceph_osdmap *ceph_osdmap_alloc(void);
 226 extern struct ceph_osdmap *ceph_osdmap_decode(void **p, void *end);
 227 struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 228                                              struct ceph_osdmap *map);
 229 extern void ceph_osdmap_destroy(struct ceph_osdmap *map);
 230
 231 struct ceph_osds {
 232         int osds[CEPH_PG_MAX_SIZE];
 233         int size;
 234         int primary; /* id, NOT index */
 235 };
 236
 237 static inline void ceph_osds_init(struct ceph_osds *set)
 238 {
 239         set->size = 0;
 240         set->primary = -1;
 241 }
 242
 243 void ceph_osds_copy(struct ceph_osds *dest, const struct ceph_osds *src);
 244
 245 bool ceph_is_new_interval(const struct ceph_osds *old_acting,
 246                           const struct ceph_osds *new_acting,
 247                           const struct ceph_osds *old_up,
 248                           const struct ceph_osds *new_up,
 249                           int old_size,
 250                           int new_size,
 251                           int old_min_size,
 252                           int new_min_size,
 253                           u32 old_pg_num,
 254                           u32 new_pg_num,
 255                           bool old_sort_bitwise,
 256                           bool new_sort_bitwise,
 257                           const struct ceph_pg *pgid);
 258 bool ceph_osds_changed(const struct ceph_osds *old_acting,
 259                        const struct ceph_osds *new_acting,
 260                        bool any_change);
 261
 262 /* calculate mapping of a file extent to an object */
 263 extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
 264                                          u64 off, u64 len,
 265                                          u64 *bno, u64 *oxoff, u64 *oxlen);
 266
 267 int ceph_object_locator_to_pg(struct ceph_osdmap *osdmap,
 268                               struct ceph_object_id *oid,
 269                               struct ceph_object_locator *oloc,
 270                               struct ceph_pg *raw_pgid);
 271
 272 void ceph_pg_to_up_acting_osds(struct ceph_osdmap *osdmap,
 273                                const struct ceph_pg *raw_pgid,
 274                                struct ceph_osds *up,
 275                                struct ceph_osds *acting);
 276 int ceph_pg_to_acting_primary(struct ceph_osdmap *osdmap,
 277                               const struct ceph_pg *raw_pgid);
 278
 279 extern struct ceph_pg_pool_info *ceph_pg_pool_by_id(struct ceph_osdmap *map,
 280                                                     u64 id);
 281
 282 extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id);
 283 extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name);
 284
 285 #endif