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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, | |
fb4100ae JT |
19 | struct bio *bio, struct policy_locker *locker, |
20 | struct policy_result *result) | |
c6b4fcba | 21 | { |
fb4100ae | 22 | return p->map(p, oblock, can_block, can_migrate, discarded_oblock, bio, locker, result); |
c6b4fcba JT |
23 | } |
24 | ||
25 | static inline int policy_lookup(struct dm_cache_policy *p, dm_oblock_t oblock, dm_cblock_t *cblock) | |
26 | { | |
27 | BUG_ON(!p->lookup); | |
28 | return p->lookup(p, oblock, cblock); | |
29 | } | |
30 | ||
31 | static inline void policy_set_dirty(struct dm_cache_policy *p, dm_oblock_t oblock) | |
32 | { | |
33 | if (p->set_dirty) | |
34 | p->set_dirty(p, oblock); | |
35 | } | |
36 | ||
37 | static inline void policy_clear_dirty(struct dm_cache_policy *p, dm_oblock_t oblock) | |
38 | { | |
39 | if (p->clear_dirty) | |
40 | p->clear_dirty(p, oblock); | |
41 | } | |
42 | ||
43 | static inline int policy_load_mapping(struct dm_cache_policy *p, | |
44 | dm_oblock_t oblock, dm_cblock_t cblock, | |
45 | uint32_t hint, bool hint_valid) | |
46 | { | |
47 | return p->load_mapping(p, oblock, cblock, hint, hint_valid); | |
48 | } | |
49 | ||
50 | static inline int policy_walk_mappings(struct dm_cache_policy *p, | |
51 | policy_walk_fn fn, void *context) | |
52 | { | |
53 | return p->walk_mappings ? p->walk_mappings(p, fn, context) : 0; | |
54 | } | |
55 | ||
56 | static inline int policy_writeback_work(struct dm_cache_policy *p, | |
57 | dm_oblock_t *oblock, | |
20f6814b JT |
58 | dm_cblock_t *cblock, |
59 | bool critical_only) | |
c6b4fcba | 60 | { |
20f6814b | 61 | return p->writeback_work ? p->writeback_work(p, oblock, cblock, critical_only) : -ENOENT; |
c6b4fcba JT |
62 | } |
63 | ||
64 | static inline void policy_remove_mapping(struct dm_cache_policy *p, dm_oblock_t oblock) | |
65 | { | |
3351937e | 66 | p->remove_mapping(p, oblock); |
c6b4fcba JT |
67 | } |
68 | ||
532906aa JT |
69 | static inline int policy_remove_cblock(struct dm_cache_policy *p, dm_cblock_t cblock) |
70 | { | |
71 | return p->remove_cblock(p, cblock); | |
72 | } | |
73 | ||
c6b4fcba JT |
74 | static inline void policy_force_mapping(struct dm_cache_policy *p, |
75 | dm_oblock_t current_oblock, dm_oblock_t new_oblock) | |
76 | { | |
77 | return p->force_mapping(p, current_oblock, new_oblock); | |
78 | } | |
79 | ||
80 | static inline dm_cblock_t policy_residency(struct dm_cache_policy *p) | |
81 | { | |
82 | return p->residency(p); | |
83 | } | |
84 | ||
85 | static inline void policy_tick(struct dm_cache_policy *p) | |
86 | { | |
87 | if (p->tick) | |
88 | return p->tick(p); | |
89 | } | |
90 | ||
91 | static inline int policy_emit_config_values(struct dm_cache_policy *p, char *result, unsigned maxlen) | |
92 | { | |
93 | ssize_t sz = 0; | |
94 | if (p->emit_config_values) | |
95 | return p->emit_config_values(p, result, maxlen); | |
96 | ||
97 | DMEMIT("0"); | |
98 | return 0; | |
99 | } | |
100 | ||
101 | static inline int policy_set_config_value(struct dm_cache_policy *p, | |
102 | const char *key, const char *value) | |
103 | { | |
104 | return p->set_config_value ? p->set_config_value(p, key, value) : -EINVAL; | |
105 | } | |
106 | ||
107 | /*----------------------------------------------------------------*/ | |
108 | ||
109 | /* | |
110 | * Creates a new cache policy given a policy name, a cache size, an origin size and the block size. | |
111 | */ | |
112 | struct dm_cache_policy *dm_cache_policy_create(const char *name, dm_cblock_t cache_size, | |
113 | sector_t origin_size, sector_t block_size); | |
114 | ||
115 | /* | |
116 | * Destroys the policy. This drops references to the policy module as well | |
117 | * as calling it's destroy method. So always use this rather than calling | |
118 | * the policy->destroy method directly. | |
119 | */ | |
120 | void dm_cache_policy_destroy(struct dm_cache_policy *p); | |
121 | ||
122 | /* | |
123 | * In case we've forgotten. | |
124 | */ | |
125 | const char *dm_cache_policy_get_name(struct dm_cache_policy *p); | |
126 | ||
4e7f506f MS |
127 | const unsigned *dm_cache_policy_get_version(struct dm_cache_policy *p); |
128 | ||
c6b4fcba JT |
129 | size_t dm_cache_policy_get_hint_size(struct dm_cache_policy *p); |
130 | ||
131 | /*----------------------------------------------------------------*/ | |
132 | ||
133 | #endif /* DM_CACHE_POLICY_INTERNAL_H */ |