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c6b4fcba JT |
1 | /* |
2 | * Copyright (C) 2012 Red Hat. All rights reserved. | |
3 | * | |
4 | * This file is released under the GPL. | |
5 | */ | |
6 | ||
7 | #ifndef DM_CACHE_POLICY_INTERNAL_H | |
8 | #define DM_CACHE_POLICY_INTERNAL_H | |
9 | ||
10 | #include "dm-cache-policy.h" | |
11 | ||
12 | /*----------------------------------------------------------------*/ | |
13 | ||
14 | /* | |
15 | * Little inline functions that simplify calling the policy methods. | |
16 | */ | |
17 | static inline int policy_map(struct dm_cache_policy *p, dm_oblock_t oblock, | |
18 | bool can_block, bool can_migrate, bool discarded_oblock, | |
19 | struct bio *bio, struct policy_result *result) | |
20 | { | |
21 | return p->map(p, oblock, can_block, can_migrate, discarded_oblock, bio, result); | |
22 | } | |
23 | ||
24 | static inline int policy_lookup(struct dm_cache_policy *p, dm_oblock_t oblock, dm_cblock_t *cblock) | |
25 | { | |
26 | BUG_ON(!p->lookup); | |
27 | return p->lookup(p, oblock, cblock); | |
28 | } | |
29 | ||
30 | static inline void policy_set_dirty(struct dm_cache_policy *p, dm_oblock_t oblock) | |
31 | { | |
32 | if (p->set_dirty) | |
33 | p->set_dirty(p, oblock); | |
34 | } | |
35 | ||
36 | static inline void policy_clear_dirty(struct dm_cache_policy *p, dm_oblock_t oblock) | |
37 | { | |
38 | if (p->clear_dirty) | |
39 | p->clear_dirty(p, oblock); | |
40 | } | |
41 | ||
42 | static inline int policy_load_mapping(struct dm_cache_policy *p, | |
43 | dm_oblock_t oblock, dm_cblock_t cblock, | |
44 | uint32_t hint, bool hint_valid) | |
45 | { | |
46 | return p->load_mapping(p, oblock, cblock, hint, hint_valid); | |
47 | } | |
48 | ||
49 | static inline int policy_walk_mappings(struct dm_cache_policy *p, | |
50 | policy_walk_fn fn, void *context) | |
51 | { | |
52 | return p->walk_mappings ? p->walk_mappings(p, fn, context) : 0; | |
53 | } | |
54 | ||
55 | static inline int policy_writeback_work(struct dm_cache_policy *p, | |
56 | dm_oblock_t *oblock, | |
57 | dm_cblock_t *cblock) | |
58 | { | |
59 | return p->writeback_work ? p->writeback_work(p, oblock, cblock) : -ENOENT; | |
60 | } | |
61 | ||
62 | static inline void policy_remove_mapping(struct dm_cache_policy *p, dm_oblock_t oblock) | |
63 | { | |
3351937e | 64 | p->remove_mapping(p, oblock); |
c6b4fcba JT |
65 | } |
66 | ||
532906aa JT |
67 | static inline int policy_remove_cblock(struct dm_cache_policy *p, dm_cblock_t cblock) |
68 | { | |
69 | return p->remove_cblock(p, cblock); | |
70 | } | |
71 | ||
c6b4fcba JT |
72 | static inline void policy_force_mapping(struct dm_cache_policy *p, |
73 | dm_oblock_t current_oblock, dm_oblock_t new_oblock) | |
74 | { | |
75 | return p->force_mapping(p, current_oblock, new_oblock); | |
76 | } | |
77 | ||
78 | static inline dm_cblock_t policy_residency(struct dm_cache_policy *p) | |
79 | { | |
80 | return p->residency(p); | |
81 | } | |
82 | ||
83 | static inline void policy_tick(struct dm_cache_policy *p) | |
84 | { | |
85 | if (p->tick) | |
86 | return p->tick(p); | |
87 | } | |
88 | ||
89 | static inline int policy_emit_config_values(struct dm_cache_policy *p, char *result, unsigned maxlen) | |
90 | { | |
91 | ssize_t sz = 0; | |
92 | if (p->emit_config_values) | |
93 | return p->emit_config_values(p, result, maxlen); | |
94 | ||
95 | DMEMIT("0"); | |
96 | return 0; | |
97 | } | |
98 | ||
99 | static inline int policy_set_config_value(struct dm_cache_policy *p, | |
100 | const char *key, const char *value) | |
101 | { | |
102 | return p->set_config_value ? p->set_config_value(p, key, value) : -EINVAL; | |
103 | } | |
104 | ||
105 | /*----------------------------------------------------------------*/ | |
106 | ||
107 | /* | |
108 | * Creates a new cache policy given a policy name, a cache size, an origin size and the block size. | |
109 | */ | |
110 | struct dm_cache_policy *dm_cache_policy_create(const char *name, dm_cblock_t cache_size, | |
111 | sector_t origin_size, sector_t block_size); | |
112 | ||
113 | /* | |
114 | * Destroys the policy. This drops references to the policy module as well | |
115 | * as calling it's destroy method. So always use this rather than calling | |
116 | * the policy->destroy method directly. | |
117 | */ | |
118 | void dm_cache_policy_destroy(struct dm_cache_policy *p); | |
119 | ||
120 | /* | |
121 | * In case we've forgotten. | |
122 | */ | |
123 | const char *dm_cache_policy_get_name(struct dm_cache_policy *p); | |
124 | ||
4e7f506f MS |
125 | const unsigned *dm_cache_policy_get_version(struct dm_cache_policy *p); |
126 | ||
c6b4fcba JT |
127 | size_t dm_cache_policy_get_hint_size(struct dm_cache_policy *p); |
128 | ||
129 | /*----------------------------------------------------------------*/ | |
130 | ||
131 | #endif /* DM_CACHE_POLICY_INTERNAL_H */ |