source: src/linux/universal/linux-3.18/include/linux/ceph/osdmap.h @ 31869

Last change on this file since 31869 was 31869, checked in by brainslayer, 2 months ago

update

File size: 5.4 KB
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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/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();
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63 * (probably outdated: must be 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_warning("incomplete pg encoding");
179
180                return -EINVAL;
181        }
182        version = ceph_decode_8(p);
183        if (version > 1) {
184                pr_warning("do not understand pg encoding %d > 1",
185                        (int)version);
186                return -EINVAL;
187        }
188
189        pgid->pool = ceph_decode_64(p);
190        pgid->seed = ceph_decode_32(p);
191        *p += 4;        /* skip deprecated preferred value */
192
193        return 0;
194}
195
196extern struct ceph_osdmap *ceph_osdmap_decode(void **p, void *end);
197extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
198                                            struct ceph_osdmap *map,
199                                            struct ceph_messenger *msgr);
200extern void ceph_osdmap_destroy(struct ceph_osdmap *map);
201
202/* calculate mapping of a file extent to an object */
203extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
204                                         u64 off, u64 len,
205                                         u64 *bno, u64 *oxoff, u64 *oxlen);
206
207/* calculate mapping of object to a placement group */
208extern int ceph_oloc_oid_to_pg(struct ceph_osdmap *osdmap,
209                               struct ceph_object_locator *oloc,
210                               struct ceph_object_id *oid,
211                               struct ceph_pg *pg_out);
212
213extern int ceph_calc_pg_acting(struct ceph_osdmap *osdmap,
214                               struct ceph_pg pgid,
215                               int *osds, int *primary);
216extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap,
217                                struct ceph_pg pgid);
218
219extern struct ceph_pg_pool_info *ceph_pg_pool_by_id(struct ceph_osdmap *map,
220                                                    u64 id);
221
222extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id);
223extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name);
224
225#endif
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