1/* vi: set sw=4 ts=4: */ 2/* 3 * blkidP.h - Internal interfaces for libblkid 4 * 5 * Copyright (C) 2001 Andreas Dilger 6 * Copyright (C) 2003 Theodore Ts'o 7 * 8 * %Begin-Header% 9 * This file may be redistributed under the terms of the 10 * GNU Lesser General Public License. 11 * %End-Header% 12 */ 13 14#ifndef _BLKID_BLKIDP_H 15#define _BLKID_BLKIDP_H 16 17#include <sys/types.h> 18#include <stdio.h> 19 20#include "blkid.h" 21#include "list.h" 22 23#ifdef __GNUC__ 24#define __BLKID_ATTR(x) __attribute__(x) 25#else 26#define __BLKID_ATTR(x) 27#endif 28 29 30/* 31 * This describes the attributes of a specific device. 32 * We can traverse all of the tags by bid_tags (linking to the tag bit_names). 33 * The bid_label and bid_uuid fields are shortcuts to the LABEL and UUID tag 34 * values, if they exist. 35 */ 36struct blkid_struct_dev 37{ 38 struct list_head bid_devs; /* All devices in the cache */ 39 struct list_head bid_tags; /* All tags for this device */ 40 blkid_cache bid_cache; /* Dev belongs to this cache */ 41 char *bid_name; /* Device inode pathname */ 42 char *bid_type; /* Preferred device TYPE */ 43 int bid_pri; /* Device priority */ 44 dev_t bid_devno; /* Device major/minor number */ 45 time_t bid_time; /* Last update time of device */ 46 unsigned int bid_flags; /* Device status bitflags */ 47 char *bid_label; /* Shortcut to device LABEL */ 48 char *bid_uuid; /* Shortcut to binary UUID */ 49}; 50 51#define BLKID_BID_FL_VERIFIED 0x0001 /* Device data validated from disk */ 52#define BLKID_BID_FL_INVALID 0x0004 /* Device is invalid */ 53 54/* 55 * Each tag defines a NAME=value pair for a particular device. The tags 56 * are linked via bit_names for a single device, so that traversing the 57 * names list will get you a list of all tags associated with a device. 58 * They are also linked via bit_values for all devices, so one can easily 59 * search all tags with a given NAME for a specific value. 60 */ 61struct blkid_struct_tag 62{ 63 struct list_head bit_tags; /* All tags for this device */ 64 struct list_head bit_names; /* All tags with given NAME */ 65 char *bit_name; /* NAME of tag (shared) */ 66 char *bit_val; /* value of tag */ 67 blkid_dev bit_dev; /* pointer to device */ 68}; 69typedef struct blkid_struct_tag *blkid_tag; 70 71/* 72 * Minimum number of seconds between device probes, even when reading 73 * from the cache. This is to avoid re-probing all devices which were 74 * just probed by another program that does not share the cache. 75 */ 76#define BLKID_PROBE_MIN 2 77 78/* 79 * Time in seconds an entry remains verified in the in-memory cache 80 * before being reverified (in case of long-running processes that 81 * keep a cache in memory and continue to use it for a long time). 82 */ 83#define BLKID_PROBE_INTERVAL 200 84 85/* This describes an entire blkid cache file and probed devices. 86 * We can traverse all of the found devices via bic_list. 87 * We can traverse all of the tag types by bic_tags, which hold empty tags 88 * for each tag type. Those tags can be used as list_heads for iterating 89 * through all devices with a specific tag type (e.g. LABEL). 90 */ 91struct blkid_struct_cache 92{ 93 struct list_head bic_devs; /* List head of all devices */ 94 struct list_head bic_tags; /* List head of all tag types */ 95 time_t bic_time; /* Last probe time */ 96 time_t bic_ftime; /* Mod time of the cachefile */ 97 unsigned int bic_flags; /* Status flags of the cache */ 98 char *bic_filename; /* filename of cache */ 99}; 100 101#define BLKID_BIC_FL_PROBED 0x0002 /* We probed /proc/partition devices */ 102#define BLKID_BIC_FL_CHANGED 0x0004 /* Cache has changed from disk */ 103 104extern char *blkid_strdup(const char *s); 105extern char *blkid_strndup(const char *s, const int length); 106 107#define BLKID_CACHE_FILE "/etc/blkid.tab" 108extern const char *blkid_devdirs[]; 109 110#define BLKID_ERR_IO 5 111#define BLKID_ERR_PROC 9 112#define BLKID_ERR_MEM 12 113#define BLKID_ERR_CACHE 14 114#define BLKID_ERR_DEV 19 115#define BLKID_ERR_PARAM 22 116#define BLKID_ERR_BIG 27 117 118/* 119 * Priority settings for different types of devices 120 */ 121#define BLKID_PRI_EVMS 30 122#define BLKID_PRI_LVM 20 123#define BLKID_PRI_MD 10 124 125#if defined(TEST_PROGRAM) && !defined(CONFIG_BLKID_DEBUG) 126#define CONFIG_BLKID_DEBUG 127#endif 128 129#define DEBUG_CACHE 0x0001 130#define DEBUG_DUMP 0x0002 131#define DEBUG_DEV 0x0004 132#define DEBUG_DEVNAME 0x0008 133#define DEBUG_DEVNO 0x0010 134#define DEBUG_PROBE 0x0020 135#define DEBUG_READ 0x0040 136#define DEBUG_RESOLVE 0x0080 137#define DEBUG_SAVE 0x0100 138#define DEBUG_TAG 0x0200 139#define DEBUG_INIT 0x8000 140#define DEBUG_ALL 0xFFFF 141 142#ifdef CONFIG_BLKID_DEBUG 143#include <stdio.h> 144extern int blkid_debug_mask; 145#define DBG(m,x) if ((m) & blkid_debug_mask) x; 146#else 147#define DBG(m,x) 148#endif 149 150#ifdef CONFIG_BLKID_DEBUG 151extern void blkid_debug_dump_dev(blkid_dev dev); 152extern void blkid_debug_dump_tag(blkid_tag tag); 153#endif 154 155/* lseek.c */ 156/* extern blkid_loff_t blkid_llseek(int fd, blkid_loff_t offset, int whence); */ 157#ifdef CONFIG_LFS 158# define blkid_llseek lseek64 159#else 160# define blkid_llseek lseek 161#endif 162 163/* read.c */ 164extern void blkid_read_cache(blkid_cache cache); 165 166/* save.c */ 167extern int blkid_flush_cache(blkid_cache cache); 168 169/* 170 * Functions to create and find a specific tag type: tag.c 171 */ 172extern void blkid_free_tag(blkid_tag tag); 173extern blkid_tag blkid_find_tag_dev(blkid_dev dev, const char *type); 174extern int blkid_set_tag(blkid_dev dev, const char *name, 175 const char *value, const int vlength); 176 177/* 178 * Functions to create and find a specific tag type: dev.c 179 */ 180extern blkid_dev blkid_new_dev(void); 181extern void blkid_free_dev(blkid_dev dev); 182 183#ifdef __cplusplus 184} 185#endif 186 187#endif /* _BLKID_BLKIDP_H */ 188