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 u64 flags;
39 char *name;
40};
41
42struct ceph_object_locator {
43 uint64_t pool;
44 char *key;
45};
46
47struct ceph_pg_mapping {
48 struct rb_node node;
49 struct ceph_pg pgid;
50 int len;
51 int osds[];
52};
53
54struct ceph_osdmap {
55 struct ceph_fsid fsid;
56 u32 epoch;
57 u32 mkfs_epoch;
58 struct ceph_timespec created, modified;
59
60 u32 flags; /* CEPH_OSDMAP_* */
61
62 u32 max_osd; /* size of osd_state, _offload, _addr arrays */
63 u8 *osd_state; /* CEPH_OSD_* */
64 u32 *osd_weight; /* 0 = failed, 0x10000 = 100% normal */
65 struct ceph_entity_addr *osd_addr;
66
67 struct rb_root pg_temp;
68 struct rb_root pg_pools;
69 u32 pool_max;
70
71 /* the CRUSH map specifies the mapping of placement groups to
72 * the list of osds that store+replicate them. */
73 struct crush_map *crush;
74};
75
76/*
77 * file layout helpers
78 */
79#define ceph_file_layout_su(l) ((__s32)le32_to_cpu((l).fl_stripe_unit))
80#define ceph_file_layout_stripe_count(l) \
81 ((__s32)le32_to_cpu((l).fl_stripe_count))
82#define ceph_file_layout_object_size(l) ((__s32)le32_to_cpu((l).fl_object_size))
83#define ceph_file_layout_cas_hash(l) ((__s32)le32_to_cpu((l).fl_cas_hash))
84#define ceph_file_layout_object_su(l) \
85 ((__s32)le32_to_cpu((l).fl_object_stripe_unit))
86#define ceph_file_layout_pg_pool(l) \
87 ((__s32)le32_to_cpu((l).fl_pg_pool))
88
89static inline unsigned ceph_file_layout_stripe_width(struct ceph_file_layout *l)
90{
91 return le32_to_cpu(l->fl_stripe_unit) *
92 le32_to_cpu(l->fl_stripe_count);
93}
94
95/* "period" == bytes before i start on a new set of objects */
96static inline unsigned ceph_file_layout_period(struct ceph_file_layout *l)
97{
98 return le32_to_cpu(l->fl_object_size) *
99 le32_to_cpu(l->fl_stripe_count);
100}
101
102
103static inline int ceph_osd_is_up(struct ceph_osdmap *map, int osd)
104{
105 return (osd < map->max_osd) && (map->osd_state[osd] & CEPH_OSD_UP);
106}
107
108static inline bool ceph_osdmap_flag(struct ceph_osdmap *map, int flag)
109{
110 return map && (map->flags & flag);
111}
112
113extern char *ceph_osdmap_state_str(char *str, int len, int state);
114
115static inline struct ceph_entity_addr *ceph_osd_addr(struct ceph_osdmap *map,
116 int osd)
117{
118 if (osd >= map->max_osd)
119 return NULL;
120 return &map->osd_addr[osd];
121}
122
123static inline int ceph_decode_pgid(void **p, void *end, struct ceph_pg *pgid)
124{
125 __u8 version;
126
127 if (!ceph_has_room(p, end, 1 + 8 + 4 + 4)) {
128 pr_warning("incomplete pg encoding");
129
130 return -EINVAL;
131 }
132 version = ceph_decode_8(p);
133 if (version > 1) {
134 pr_warning("do not understand pg encoding %d > 1",
135 (int)version);
136 return -EINVAL;
137 }
138
139 pgid->pool = ceph_decode_64(p);
140 pgid->seed = ceph_decode_32(p);
141 *p += 4; /* skip deprecated preferred value */
142
143 return 0;
144}
145
146extern struct ceph_osdmap *osdmap_decode(void **p, void *end);
147extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
148 struct ceph_osdmap *map,
149 struct ceph_messenger *msgr);
150extern void ceph_osdmap_destroy(struct ceph_osdmap *map);
151
152/* calculate mapping of a file extent to an object */
153extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
154 u64 off, u64 len,
155 u64 *bno, u64 *oxoff, u64 *oxlen);
156
157/* calculate mapping of object to a placement group */
158extern int ceph_calc_ceph_pg(struct ceph_pg *pg, const char *oid,
159 struct ceph_osdmap *osdmap, uint64_t pool);
160extern int ceph_calc_pg_acting(struct ceph_osdmap *osdmap,
161 struct ceph_pg pgid,
162 int *acting);
163extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap,
164 struct ceph_pg pgid);
165
166extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id);
167extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name);
168
169#endif