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/*
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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 .
*
* This copyrighted material is made available to anyone wishing to use ,
* 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 ,
* Inc . , 59 Temple Place , Suite 330 , Boston , MA 02111 - 1307 USA
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*/
# ifndef _LVM_DEVICE_H
# 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 */
# define DEV_O_DIRECT 0x00000020 /* Use O_DIRECT */
# define DEV_O_DIRECT_TESTED 0x00000040 /* DEV_O_DIRECT is reliable */
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/*
* All devices in LVM will be represented by one of these .
* pointer comparisons are valid .
*/
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 */
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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struct device_area {
struct device * dev ;
uint64_t start ; /* Bytes */
uint64_t size ; /* Bytes */
} ;
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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 */
int dev_open ( struct device * dev ) ;
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 ) ;
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 ,
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 ) ;
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 ) ;
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? */
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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unsigned long dev_alignment_offset ( const char * sysfs_dir ,
struct device * dev ) ;
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# endif