1 /* 2 * blkidP.h - Internal interfaces for libblkid 3 * 4 * Copyright (C) 2001 Andreas Dilger 5 * Copyright (C) 2003 Theodore Ts'o 6 * 7 * %Begin-Header% 8 * This file may be redistributed under the terms of the 9 * GNU Lesser General Public License. 10 * %End-Header% 11 */ 12 13 #ifndef _BLKID_BLKIDP_H 14 #define _BLKID_BLKIDP_H 15 16 #include <sys/types.h> 17 #include <stdio.h> 18 19 #include <blkid/blkid.h> 20 21 #include <blkid/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 */ 36 struct 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 */ 61 struct 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 }; 69 typedef 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 */ 91 struct 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 */ 103 104 extern char *blkid_strdup(const char *s); 105 extern char *blkid_strndup(const char *s, const int length); 106 107 #define BLKID_CACHE_FILE "/etc/blkid.tab" 108 extern 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_DM 40 122 #define BLKID_PRI_EVMS 30 123 #define BLKID_PRI_LVM 20 124 #define BLKID_PRI_MD 10 125 126 #if defined(TEST_PROGRAM) && !defined(CONFIG_BLKID_DEBUG) 127 #define CONFIG_BLKID_DEBUG 128 #endif 129 130 #define DEBUG_CACHE 0x0001 131 #define DEBUG_DUMP 0x0002 132 #define DEBUG_DEV 0x0004 133 #define DEBUG_DEVNAME 0x0008 134 #define DEBUG_DEVNO 0x0010 135 #define DEBUG_PROBE 0x0020 136 #define DEBUG_READ 0x0040 137 #define DEBUG_RESOLVE 0x0080 138 #define DEBUG_SAVE 0x0100 139 #define DEBUG_TAG 0x0200 140 #define DEBUG_INIT 0x8000 141 #define DEBUG_ALL 0xFFFF 142 143 #ifdef CONFIG_BLKID_DEBUG 144 #include <stdio.h> 145 extern int blkid_debug_mask; 146 #define DBG(m,x) if ((m) & blkid_debug_mask) x; 147 #else 148 #define DBG(m,x) 149 #endif 150 151 #ifdef CONFIG_BLKID_DEBUG 152 extern void blkid_debug_dump_dev(blkid_dev dev); 153 extern void blkid_debug_dump_tag(blkid_tag tag); 154 #endif 155 156 /* lseek.c */ 157 extern blkid_loff_t blkid_llseek(int fd, blkid_loff_t offset, int whence); 158 159 /* read.c */ 160 extern void blkid_read_cache(blkid_cache cache); 161 162 /* save.c */ 163 extern int blkid_flush_cache(blkid_cache cache); 164 165 /* 166 * Functions to create and find a specific tag type: tag.c 167 */ 168 extern void blkid_free_tag(blkid_tag tag); 169 extern blkid_tag blkid_find_tag_dev(blkid_dev dev, const char *type); 170 extern int blkid_set_tag(blkid_dev dev, const char *name, 171 const char *value, const int vlength); 172 173 /* 174 * Functions to create and find a specific tag type: dev.c 175 */ 176 extern blkid_dev blkid_new_dev(void); 177 extern void blkid_free_dev(blkid_dev dev); 178 179 #ifdef __cplusplus 180 } 181 #endif 182 183 #endif /* _BLKID_BLKIDP_H */ 184