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