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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/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 */
21struct ceph_pg {
22 uint64_t pool;
23 uint32_t seed;
24};
25
26#define CEPH_POOL_FLAG_HASHPSPOOL 1
27
28struct ceph_pg_pool_info {
29 struct rb_node node;
30 s64 id;
31 u8 type;
32 u8 size;
33 u8 crush_ruleset;
34 u8 object_hash;
35 u32 pg_num, pgp_num;
36 int pg_num_mask, pgp_num_mask;
37 u64 flags;
38 char *name;
39};
40
41struct ceph_object_locator {
42 uint64_t pool;
43 char *key;
44};
45
46struct ceph_pg_mapping {
47 struct rb_node node;
48 struct ceph_pg pgid;
49 int len;
50 int osds[];
51};
52
53struct ceph_osdmap {
54 struct ceph_fsid fsid;
55 u32 epoch;
56 u32 mkfs_epoch;
57 struct ceph_timespec created, modified;
58
59 u32 flags; /* CEPH_OSDMAP_* */
60
61 u32 max_osd; /* size of osd_state, _offload, _addr arrays */
62 u8 *osd_state; /* CEPH_OSD_* */
63 u32 *osd_weight; /* 0 = failed, 0x10000 = 100% normal */
64 struct ceph_entity_addr *osd_addr;
65
66 struct rb_root pg_temp;
67 struct rb_root pg_pools;
68 u32 pool_max;
69
70 /* the CRUSH map specifies the mapping of placement groups to
71 * the list of osds that store+replicate them. */
72 struct crush_map *crush;
73};
74
75/*
76 * file layout helpers
77 */
78#define ceph_file_layout_su(l) ((__s32)le32_to_cpu((l).fl_stripe_unit))
79#define ceph_file_layout_stripe_count(l) \
80 ((__s32)le32_to_cpu((l).fl_stripe_count))
81#define ceph_file_layout_object_size(l) ((__s32)le32_to_cpu((l).fl_object_size))
82#define ceph_file_layout_cas_hash(l) ((__s32)le32_to_cpu((l).fl_cas_hash))
83#define ceph_file_layout_object_su(l) \
84 ((__s32)le32_to_cpu((l).fl_object_stripe_unit))
85#define ceph_file_layout_pg_pool(l) \
86 ((__s32)le32_to_cpu((l).fl_pg_pool))
87
88static inline unsigned ceph_file_layout_stripe_width(struct ceph_file_layout *l)
89{
90 return le32_to_cpu(l->fl_stripe_unit) *
91 le32_to_cpu(l->fl_stripe_count);
92}
93
94/* "period" == bytes before i start on a new set of objects */
95static inline unsigned ceph_file_layout_period(struct ceph_file_layout *l)
96{
97 return le32_to_cpu(l->fl_object_size) *
98 le32_to_cpu(l->fl_stripe_count);
99}
100
101
102static inline int ceph_osd_is_up(struct ceph_osdmap *map, int osd)
103{
104 return (osd < map->max_osd) && (map->osd_state[osd] & CEPH_OSD_UP);
105}
106
107static inline bool ceph_osdmap_flag(struct ceph_osdmap *map, int flag)
108{
109 return map && (map->flags & flag);
110}
111
112extern char *ceph_osdmap_state_str(char *str, int len, int state);
113
114static inline struct ceph_entity_addr *ceph_osd_addr(struct ceph_osdmap *map,
115 int osd)
116{
117 if (osd >= map->max_osd)
118 return NULL;
119 return &map->osd_addr[osd];
120}
121
122extern struct ceph_osdmap *osdmap_decode(void **p, void *end);
123extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
124 struct ceph_osdmap *map,
125 struct ceph_messenger *msgr);
126extern void ceph_osdmap_destroy(struct ceph_osdmap *map);
127
128/* calculate mapping of a file extent to an object */
129extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
130 u64 off, u64 len,
131 u64 *bno, u64 *oxoff, u64 *oxlen);
132
133/* calculate mapping of object to a placement group */
134extern int ceph_calc_object_layout(struct ceph_pg *pg,
135 const char *oid,
136 struct ceph_file_layout *fl,
137 struct ceph_osdmap *osdmap);
138extern int ceph_calc_pg_acting(struct ceph_osdmap *osdmap,
139 struct ceph_pg pgid,
140 int *acting);
141extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap,
142 struct ceph_pg pgid);
143
144extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id);
145extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name);
146
147#endif