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