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5abdb52fdc
The list of strings is used quite frequently and we'd like to reuse this simple structure for report selection support too. Make it part of libdevmapper for general reuse throughout the code. This also simplifies the LVM code a bit since we don't need to include and manage lvm-types.h anymore (the string list was the only structure defined there).
104 lines
3.3 KiB
C
104 lines
3.3 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 dm_str_list */
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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 error_count;
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int max_error_count;
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int phys_block_size;
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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_block_size(struct device *dev, unsigned int *phys_block_size, unsigned int *block_size);
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int dev_get_size(const struct device *dev, uint64_t *size);
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int dev_get_read_ahead(struct device *dev, uint32_t *read_ahead);
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int dev_discard_blocks(struct device *dev, uint64_t offset_bytes, uint64_t size_bytes);
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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_open_readonly(struct device *dev);
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int dev_open_readonly_buffered(struct device *dev);
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int dev_open_readonly_quiet(struct device *dev);
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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, char *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, char *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 dm_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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#endif
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