release/src/router/busybox/e2fsprogs/old_e2fsprogs/blkid/blkidP.h

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