Linux kernel mirror (for testing)
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linux
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
44struct ceph_object_locator {
45 s64 pool;
46};
47
48/*
49 * Maximum supported by kernel client object name length
50 *
51 * (probably outdated: must be >= RBD_MAX_MD_NAME_LEN -- currently 100)
52 */
53#define CEPH_MAX_OID_NAME_LEN 100
54
55struct ceph_object_id {
56 char name[CEPH_MAX_OID_NAME_LEN];
57 int name_len;
58};
59
60struct ceph_pg_mapping {
61 struct rb_node node;
62 struct ceph_pg pgid;
63 int len;
64 int osds[];
65};
66
67struct ceph_osdmap {
68 struct ceph_fsid fsid;
69 u32 epoch;
70 u32 mkfs_epoch;
71 struct ceph_timespec created, modified;
72
73 u32 flags; /* CEPH_OSDMAP_* */
74
75 u32 max_osd; /* size of osd_state, _offload, _addr arrays */
76 u8 *osd_state; /* CEPH_OSD_* */
77 u32 *osd_weight; /* 0 = failed, 0x10000 = 100% normal */
78 struct ceph_entity_addr *osd_addr;
79
80 struct rb_root pg_temp;
81 struct rb_root pg_pools;
82 u32 pool_max;
83
84 /* the CRUSH map specifies the mapping of placement groups to
85 * the list of osds that store+replicate them. */
86 struct crush_map *crush;
87};
88
89static inline void ceph_oid_set_name(struct ceph_object_id *oid,
90 const char *name)
91{
92 int len;
93
94 len = strlen(name);
95 if (len > sizeof(oid->name)) {
96 WARN(1, "ceph_oid_set_name '%s' len %d vs %zu, truncating\n",
97 name, len, sizeof(oid->name));
98 len = sizeof(oid->name);
99 }
100
101 memcpy(oid->name, name, len);
102 oid->name_len = len;
103}
104
105static inline void ceph_oid_copy(struct ceph_object_id *dest,
106 struct ceph_object_id *src)
107{
108 BUG_ON(src->name_len > sizeof(dest->name));
109 memcpy(dest->name, src->name, src->name_len);
110 dest->name_len = src->name_len;
111}
112
113static inline int ceph_osd_is_up(struct ceph_osdmap *map, int osd)
114{
115 return (osd < map->max_osd) && (map->osd_state[osd] & CEPH_OSD_UP);
116}
117
118static inline bool ceph_osdmap_flag(struct ceph_osdmap *map, int flag)
119{
120 return map && (map->flags & flag);
121}
122
123extern char *ceph_osdmap_state_str(char *str, int len, int state);
124
125static inline struct ceph_entity_addr *ceph_osd_addr(struct ceph_osdmap *map,
126 int osd)
127{
128 if (osd >= map->max_osd)
129 return NULL;
130 return &map->osd_addr[osd];
131}
132
133static inline int ceph_decode_pgid(void **p, void *end, struct ceph_pg *pgid)
134{
135 __u8 version;
136
137 if (!ceph_has_room(p, end, 1 + 8 + 4 + 4)) {
138 pr_warning("incomplete pg encoding");
139
140 return -EINVAL;
141 }
142 version = ceph_decode_8(p);
143 if (version > 1) {
144 pr_warning("do not understand pg encoding %d > 1",
145 (int)version);
146 return -EINVAL;
147 }
148
149 pgid->pool = ceph_decode_64(p);
150 pgid->seed = ceph_decode_32(p);
151 *p += 4; /* skip deprecated preferred value */
152
153 return 0;
154}
155
156extern struct ceph_osdmap *osdmap_decode(void **p, void *end);
157extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
158 struct ceph_osdmap *map,
159 struct ceph_messenger *msgr);
160extern void ceph_osdmap_destroy(struct ceph_osdmap *map);
161
162/* calculate mapping of a file extent to an object */
163extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
164 u64 off, u64 len,
165 u64 *bno, u64 *oxoff, u64 *oxlen);
166
167/* calculate mapping of object to a placement group */
168extern int ceph_oloc_oid_to_pg(struct ceph_osdmap *osdmap,
169 struct ceph_object_locator *oloc,
170 struct ceph_object_id *oid,
171 struct ceph_pg *pg_out);
172
173extern int ceph_calc_pg_acting(struct ceph_osdmap *osdmap,
174 struct ceph_pg pgid,
175 int *acting);
176extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap,
177 struct ceph_pg pgid);
178
179extern struct ceph_pg_pool_info *ceph_pg_pool_by_id(struct ceph_osdmap *map,
180 u64 id);
181
182extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id);
183extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name);
184
185#endif