/* $NetBSD: device.h,v 1.1.1.2 2009/12/02 00:25:44 haad Exp $ */ /* * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved. * Copyright (C) 2004-2007 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 Lesser General Public License v.2.1. * * You should have received a copy of the GNU Lesser 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 #define DEV_ACCESSED_W 0x00000001 /* Device written to? */ #define DEV_REGULAR 0x00000002 /* Regular file? */ #define DEV_ALLOCED 0x00000004 /* dm_malloc used */ #define DEV_OPENED_RW 0x00000008 /* Opened RW */ #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 */ /* * All devices in LVM will be represented by one of these. * pointer comparisons are valid. */ struct device { struct dm_list aliases; /* struct str_list from lvm-types.h */ dev_t dev; /* private */ int fd; int open_count; int block_size; int read_ahead; uint32_t flags; uint64_t end; struct dm_list open_list; char pvid[ID_LEN + 1]; char _padding[7]; }; struct device_list { struct dm_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); int dev_get_read_ahead(struct device *dev, uint32_t *read_ahead); /* 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 direct, int quiet); int dev_close(struct device *dev); int dev_close_immediate(struct device *dev); void dev_close_all(void); int dev_test_excl(struct device *dev); int dev_fd(struct device *dev); const char *dev_name(const struct device *dev); int dev_read(struct device *dev, uint64_t offset, size_t len, void *buffer); int dev_read_circular(struct device *dev, uint64_t offset, size_t len, uint64_t offset2, size_t len2, void *buf); 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_set(struct device *dev, uint64_t offset, size_t len, int value); void dev_flush(struct device *dev); struct device *dev_create_file(const char *filename, struct device *dev, struct str_list *alias, int use_malloc); /* Return a valid device name from the alias list; NULL otherwise */ const char *dev_name_confirmed(struct device *dev, int quiet); /* Does device contain md superblock? If so, where? */ int dev_is_md(struct device *dev, uint64_t *sb); int dev_is_swap(struct device *dev, uint64_t *signature); unsigned long dev_md_stripe_width(const char *sysfs_dir, struct device *dev); int is_partitioned_dev(struct device *dev); int get_primary_dev(const char *sysfs_dir, struct device *dev, dev_t *result); unsigned long dev_alignment_offset(const char *sysfs_dir, struct device *dev); unsigned long dev_minimum_io_size(const char *sysfs_dir, struct device *dev); unsigned long dev_optimal_io_size(const char *sysfs_dir, struct device *dev); #endif