mirror of
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104 lines
3.2 KiB
C
104 lines
3.2 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LVM_DEVICE_H
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#define _LVM_DEVICE_H
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#include "uuid.h"
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#include <fcntl.h>
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#define DEV_ACCESSED_W 0x00000001 /* Device written to? */
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#define DEV_REGULAR 0x00000002 /* Regular file? */
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#define DEV_ALLOCED 0x00000004 /* dm_malloc used */
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#define DEV_OPENED_RW 0x00000008 /* Opened RW */
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#define DEV_OPENED_EXCL 0x00000010 /* Opened EXCL */
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#define DEV_O_DIRECT 0x00000020 /* Use O_DIRECT */
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#define DEV_O_DIRECT_TESTED 0x00000040 /* DEV_O_DIRECT is reliable */
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/*
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* All devices in LVM will be represented by one of these.
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* pointer comparisons are valid.
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*/
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struct device {
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struct dm_list aliases; /* struct str_list from lvm-types.h */
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dev_t dev;
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/* private */
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int fd;
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int open_count;
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int block_size;
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int read_ahead;
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uint32_t flags;
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uint64_t end;
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struct dm_list open_list;
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char pvid[ID_LEN + 1];
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char _padding[7];
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};
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struct device_list {
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struct dm_list list;
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struct device *dev;
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};
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struct device_area {
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struct device *dev;
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uint64_t start; /* Bytes */
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uint64_t size; /* Bytes */
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};
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/*
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* All io should use these routines.
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*/
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int dev_get_size(const struct device *dev, uint64_t *size);
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int dev_get_sectsize(struct device *dev, uint32_t *size);
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int dev_get_read_ahead(struct device *dev, uint32_t *read_ahead);
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/* Use quiet version if device number could change e.g. when opening LV */
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int dev_open(struct device *dev);
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int dev_open_quiet(struct device *dev);
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int dev_open_flags(struct device *dev, int flags, int direct, int quiet);
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int dev_close(struct device *dev);
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int dev_close_immediate(struct device *dev);
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void dev_close_all(void);
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int dev_test_excl(struct device *dev);
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int dev_fd(struct device *dev);
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const char *dev_name(const struct device *dev);
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int dev_read(struct device *dev, uint64_t offset, size_t len, void *buffer);
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int dev_read_circular(struct device *dev, uint64_t offset, size_t len,
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uint64_t offset2, size_t len2, void *buf);
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int dev_write(struct device *dev, uint64_t offset, size_t len, void *buffer);
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int dev_append(struct device *dev, size_t len, void *buffer);
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int dev_set(struct device *dev, uint64_t offset, size_t len, int value);
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void dev_flush(struct device *dev);
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struct device *dev_create_file(const char *filename, struct device *dev,
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struct str_list *alias, int use_malloc);
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/* Return a valid device name from the alias list; NULL otherwise */
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const char *dev_name_confirmed(struct device *dev, int quiet);
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/* Does device contain md superblock? If so, where? */
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int dev_is_md(struct device *dev, uint64_t *sb);
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int dev_is_swap(struct device *dev, uint64_t *signature);
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unsigned long dev_md_stripe_width(const char *sysfs_dir, struct device *dev);
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int is_partitioned_dev(struct device *dev);
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#endif
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