2 * Copyright (C) 2001 Sistina Software (UK) Limited
4 * This file is released under the GPL.
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/kmod.h>
12 #include <linux/bio.h>
13 #include <linux/slab.h>
15 #define DM_MSG_PREFIX "target"
17 static LIST_HEAD(_targets
);
18 static DECLARE_RWSEM(_lock
);
20 #define DM_MOD_NAME_SIZE 32
22 static inline struct target_type
*__find_target_type(const char *name
)
24 struct target_type
*tt
;
26 list_for_each_entry(tt
, &_targets
, list
)
27 if (!strcmp(name
, tt
->name
))
33 static struct target_type
*get_target_type(const char *name
)
35 struct target_type
*tt
;
39 tt
= __find_target_type(name
);
40 if (tt
&& !try_module_get(tt
->module
))
47 static void load_module(const char *name
)
49 request_module("dm-%s", name
);
52 struct target_type
*dm_get_target_type(const char *name
)
54 struct target_type
*tt
= get_target_type(name
);
58 tt
= get_target_type(name
);
64 void dm_put_target_type(struct target_type
*tt
)
67 module_put(tt
->module
);
71 int dm_target_iterate(void (*iter_func
)(struct target_type
*tt
,
72 void *param
), void *param
)
74 struct target_type
*tt
;
77 list_for_each_entry(tt
, &_targets
, list
)
84 int dm_register_target(struct target_type
*tt
)
89 if (__find_target_type(tt
->name
))
92 list_add(&tt
->list
, &_targets
);
98 void dm_unregister_target(struct target_type
*tt
)
101 if (!__find_target_type(tt
->name
)) {
102 DMCRIT("Unregistering unrecognised target: %s", tt
->name
);
112 * io-err: always fails an io, useful for bringing
113 * up LVs that have holes in them.
115 static int io_err_ctr(struct dm_target
*tt
, unsigned int argc
, char **args
)
120 static void io_err_dtr(struct dm_target
*tt
)
125 static int io_err_map(struct dm_target
*tt
, struct bio
*bio
,
126 union map_info
*map_context
)
131 static struct target_type error_target
= {
133 .version
= {1, 0, 1},
139 int __init
dm_target_init(void)
141 return dm_register_target(&error_target
);
144 void dm_target_exit(void)
146 dm_unregister_target(&error_target
);
149 EXPORT_SYMBOL(dm_register_target
);
150 EXPORT_SYMBOL(dm_unregister_target
);
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