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mirror of git://sourceware.org/git/lvm2.git synced 2024-12-22 17:35:59 +03:00
lvm2/lib/device/device.h
Alasdair Kergon 1c31f23f56 Add a const.
2004-08-11 13:15:35 +00:00

104 lines
2.7 KiB
C

/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License v.2.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _LVM_DEVICE_H
#define _LVM_DEVICE_H
#include "uuid.h"
#include <fcntl.h>
#define DEV_ACCESSED_W 0x00000001 /* Device written to? */
#define DEV_REGULAR 0x00000002 /* Regular file? */
#define DEV_ALLOCED 0x00000004 /* dbg_malloc used */
/*
* All devices in LVM will be represented by one of these.
* pointer comparisons are valid.
*/
struct device {
struct list aliases; /* struct str_list from lvm-types.h */
dev_t dev;
/* private */
int fd;
int open_count;
uint32_t flags;
uint64_t end;
struct list open_list;
char pvid[ID_LEN + 1];
};
struct device_list {
struct list list;
struct device *dev;
};
struct device_area {
struct device *dev;
uint64_t start; /* Bytes */
uint64_t size; /* Bytes */
};
/*
* All io should use these routines.
*/
int dev_get_size(const struct device *dev, uint64_t *size);
int dev_get_sectsize(struct device *dev, uint32_t *size);
/* Use quiet version if device number could change e.g. when opening LV */
int dev_open(struct device *dev);
int dev_open_quiet(struct device *dev);
int dev_open_flags(struct device *dev, int flags, int append, int quiet);
int dev_close(struct device *dev);
int dev_close_immediate(struct device *dev);
void dev_close_all(void);
static inline int dev_fd(struct device *dev)
{
return dev->fd;
}
int dev_read(struct device *dev, uint64_t offset, size_t len, void *buffer);
int dev_write(struct device *dev, uint64_t offset, size_t len, void *buffer);
int dev_append(struct device *dev, size_t len, void *buffer);
int dev_zero(struct device *dev, uint64_t offset, size_t len);
void dev_flush(struct device *dev);
struct device *dev_create_file(const char *filename, struct device *dev,
struct str_list *alias);
static inline const char *dev_name(const struct device *dev)
{
return (dev) ? list_item(dev->aliases.n, struct str_list)->str :
"unknown device";
}
/* Return a valid device name from the alias list; NULL otherwise */
const char *dev_name_confirmed(struct device *dev, int quiet);
/* FIXME Check partition type if appropriate */
#define is_lvm_partition(a) 1
/*
static inline int is_lvm_partition(const char *name)
{
return 1;
}
*/
#endif