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143 lines
3.3 KiB
C
143 lines
3.3 KiB
C
/*
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* Copyright (C) 2001 Sistina Software (UK) Limited.
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*
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* This file is released under the LGPL.
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*/
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#ifndef LIB_DEVICE_MAPPER_H
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#define LIB_DEVICE_MAPPER_H
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#include <inttypes.h>
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#include <sys/types.h>
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#include <linux/types.h>
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/*
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* Since it is quite laborious to build the ioctl
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* arguments for the device-mapper people are
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* encouraged to use this library.
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*
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* You will need to build a struct dm_task for
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* each ioctl command you want to execute.
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*/
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typedef void (*dm_log_fn) (int level, const char *file, int line,
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const char *f, ...);
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/*
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* The library user may wish to register their own
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* logging function, by default errors go to
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* stderr.
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*/
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void dm_log_init(dm_log_fn fn);
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void dm_log_init_verbose(int level);
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enum {
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DM_DEVICE_CREATE,
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DM_DEVICE_RELOAD,
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DM_DEVICE_REMOVE,
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DM_DEVICE_REMOVE_ALL,
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DM_DEVICE_SUSPEND,
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DM_DEVICE_RESUME,
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DM_DEVICE_INFO,
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DM_DEVICE_DEPS,
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DM_DEVICE_RENAME,
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DM_DEVICE_VERSION,
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DM_DEVICE_STATUS,
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DM_DEVICE_TABLE,
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DM_DEVICE_WAITEVENT,
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DM_DEVICE_LIST,
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DM_DEVICE_CLEAR
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};
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struct dm_task;
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struct dm_task *dm_task_create(int type);
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void dm_task_destroy(struct dm_task *dmt);
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int dm_task_set_name(struct dm_task *dmt, const char *name);
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int dm_task_set_uuid(struct dm_task *dmt, const char *uuid);
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/*
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* Retrieve attributes after an info.
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*/
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struct dm_info {
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int exists;
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int suspended;
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int live_table;
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int inactive_table;
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int32_t open_count;
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uint32_t event_nr;
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uint32_t major;
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uint32_t minor; /* minor device number */
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int read_only; /* 0:read-write; 1:read-only */
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int32_t target_count;
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};
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struct dm_deps {
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uint32_t count;
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uint32_t filler;
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uint64_t device[0];
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};
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struct dm_names {
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uint64_t dev;
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uint32_t next; /* Offset to next struct from start of this struct */
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char name[0];
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};
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int dm_get_library_version(char *version, size_t size);
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int dm_task_get_driver_version(struct dm_task *dmt, char *version, size_t size);
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int dm_task_get_info(struct dm_task *dmt, struct dm_info *dmi);
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const char *dm_task_get_name(struct dm_task *dmt);
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const char *dm_task_get_uuid(struct dm_task *dmt);
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struct dm_deps *dm_task_get_deps(struct dm_task *dmt);
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struct dm_names *dm_task_get_names(struct dm_task *dmt);
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int dm_task_set_ro(struct dm_task *dmt);
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int dm_task_set_newname(struct dm_task *dmt, const char *newname);
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int dm_task_set_minor(struct dm_task *dmt, int minor);
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int dm_task_set_major(struct dm_task *dmt, int major);
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int dm_task_set_event_nr(struct dm_task *dmt, uint32_t event_nr);
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/*
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* Use these to prepare for a create or reload.
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*/
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int dm_task_add_target(struct dm_task *dmt,
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uint64_t start,
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uint64_t size, const char *ttype, const char *params);
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/*
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* Format major/minor numbers correctly for input to driver
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*/
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int dm_format_dev(char *buf, int bufsize, uint32_t dev_major, uint32_t dev_minor);
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/* Use this to retrive target information returned from a STATUS call */
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void *dm_get_next_target(struct dm_task *dmt,
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void *next, uint64_t *start, uint64_t *length,
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char **target_type, char **params);
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/*
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* Call this to actually run the ioctl.
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*/
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int dm_task_run(struct dm_task *dmt);
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/*
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* Configure the device-mapper directory
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*/
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int dm_set_dev_dir(const char *dir);
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const char *dm_dir(void);
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/* Release library resources */
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void dm_lib_release(void);
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void dm_lib_exit(void);
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#endif /* LIB_DEVICE_MAPPER_H */
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