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o added filter type.

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This commit is contained in:
Joe Thornber 2001-10-01 15:27:16 +00:00
parent b8ef655fb7
commit a5072db62a
1 changed files with 34 additions and 4 deletions
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38
lib/dev-mgr/dev-cache.h
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@ -9,21 +9,51 @@
#ifndef _LVM_DEV_CACHE_H
#define _LVM_DEV_CACHE_H
/*
* All devices in LVM will be represented by one of these.
* pointer comparisons are valid.
*/
struct device {
char *name;
dev_t dev;
};
int init_dev_cache();
void exit_dev_cache();
struct dev_filter {
int (*fn)(struct device *dev, struct dev_cache_filter *f);
void *private;
};
/*
* The global device cache.
*/
int dev_cache_init(void);
void dev_cache_exit(void);
int dev_cache_add_dir(const char *path);
struct device *dev_cache_get(const char *name);
void dev_cache_put(struct device *d);
/*
* Object for iterating through the cache.
*/
struct dev_iter;
struct dev_iter dev_iter_create(struct dev_filter *f);
void dev_iter_destroy(struct dev_iter *iter);
struct device *dev_cache_iter_get(struct dev_iter *iter);
void dev_cache_iter_put(struct dev_iter *iter);
/* returns 0 on eof */
int dev_cache_next(struct dev_iter *iter);
struct device *get_device(const char *name);
void put_device(struct device *d);
/*
* All io should use these routines, rather than opening the devices
* by hand. You do not have to call an open routine.
*/
uint64_t dev_get_size(struct device *dev); /* in 512 byte sectors */
ssize_t dev_read(struct device *dev, size_t offset, size_t len, void *buffer);
ssize_t dev_write(struct device *dev, size_t offset, size_t len, void *buffer);