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12#ifndef DM_PATH_SELECTOR_H
13#define DM_PATH_SELECTOR_H
14
15#include <linux/device-mapper.h>
16
17#include "dm-mpath.h"
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22
23struct path_selector_type;
24struct path_selector {
25 struct path_selector_type *type;
26 void *context;
27};
28
29
30struct path_selector_type {
31 char *name;
32 struct module *module;
33
34 unsigned int table_args;
35 unsigned int info_args;
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40 int (*create) (struct path_selector *ps, unsigned argc, char **argv);
41 void (*destroy) (struct path_selector *ps);
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47 int (*add_path) (struct path_selector *ps, struct dm_path *path,
48 int argc, char **argv, char **error);
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58 struct dm_path *(*select_path) (struct path_selector *ps,
59 unsigned *repeat_count,
60 size_t nr_bytes);
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65 void (*fail_path) (struct path_selector *ps, struct dm_path *p);
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70 int (*reinstate_path) (struct path_selector *ps, struct dm_path *p);
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76 int (*status) (struct path_selector *ps, struct dm_path *path,
77 status_type_t type, char *result, unsigned int maxlen);
78
79 int (*start_io) (struct path_selector *ps, struct dm_path *path,
80 size_t nr_bytes);
81 int (*end_io) (struct path_selector *ps, struct dm_path *path,
82 size_t nr_bytes);
83};
84
85
86int dm_register_path_selector(struct path_selector_type *type);
87
88
89int dm_unregister_path_selector(struct path_selector_type *type);
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92struct path_selector_type *dm_get_path_selector(const char *name);
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94
95void dm_put_path_selector(struct path_selector_type *pst);
96
97#endif
98