1 | /*
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2 | * devname.c - get a dev by its device inode name
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3 | *
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4 | * Copyright (C) Andries Brouwer
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5 | * Copyright (C) 1999, 2000, 2001, 2002, 2003 Theodore Ts'o
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6 | * Copyright (C) 2001 Andreas Dilger
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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 | #include <stdio.h>
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15 | #include <string.h>
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16 | #if HAVE_UNISTD_H
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17 | #include <unistd.h>
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18 | #endif
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19 | #include <stdlib.h>
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20 | #include <string.h>
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21 | #include <ctype.h>
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22 | #if HAVE_SYS_TYPES_H
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23 | #include <sys/types.h>
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24 | #endif
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25 | #if HAVE_SYS_STAT_H
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26 | #include <sys/stat.h>
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27 | #endif
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28 | #if HAVE_ERRNO_H
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29 | #include <errno.h>
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30 | #endif
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31 | #if HAVE_SYS_MKDEV_H
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32 | #include <sys/mkdev.h>
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33 | #endif
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34 | #include <time.h>
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35 |
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36 | #include "blkidP.h"
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37 |
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38 | /*
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39 | * Find a dev struct in the cache by device name, if available.
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40 | *
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41 | * If there is no entry with the specified device name, and the create
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42 | * flag is set, then create an empty device entry.
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43 | */
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44 | blkid_dev blkid_get_dev(blkid_cache cache, const char *devname, int flags)
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45 | {
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46 | blkid_dev dev = NULL, tmp;
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47 | struct list_head *p;
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48 |
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49 | if (!cache || !devname)
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50 | return NULL;
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51 |
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52 | list_for_each(p, &cache->bic_devs) {
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53 | tmp = list_entry(p, struct blkid_struct_dev, bid_devs);
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54 | if (strcmp(tmp->bid_name, devname))
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55 | continue;
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56 |
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57 | DBG(DEBUG_DEVNAME,
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58 | printf("found devname %s in cache\n", tmp->bid_name));
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59 | dev = tmp;
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60 | break;
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61 | }
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62 |
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63 | if (!dev && (flags & BLKID_DEV_CREATE)) {
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64 | dev = blkid_new_dev();
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65 | if (!dev)
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66 | return NULL;
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67 | dev->bid_name = blkid_strdup(devname);
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68 | dev->bid_cache = cache;
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69 | list_add_tail(&dev->bid_devs, &cache->bic_devs);
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70 | cache->bic_flags |= BLKID_BIC_FL_CHANGED;
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71 | }
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72 |
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73 | if (flags & BLKID_DEV_VERIFY)
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74 | dev = blkid_verify(cache, dev);
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75 | return dev;
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76 | }
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77 |
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78 | /*
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79 | * Probe a single block device to add to the device cache.
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80 | */
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81 | static void probe_one(blkid_cache cache, const char *ptname,
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82 | dev_t devno, int pri)
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83 | {
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84 | blkid_dev dev = NULL;
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85 | struct list_head *p;
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86 | const char **dir;
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87 | char *devname = NULL;
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88 |
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89 | /* See if we already have this device number in the cache. */
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90 | list_for_each(p, &cache->bic_devs) {
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91 | blkid_dev tmp = list_entry(p, struct blkid_struct_dev,
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92 | bid_devs);
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93 | if (tmp->bid_devno == devno) {
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94 | dev = blkid_verify(cache, tmp);
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95 | break;
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96 | }
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97 | }
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98 | if (dev && dev->bid_devno == devno)
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99 | goto set_pri;
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100 |
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101 | /*
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102 | * Take a quick look at /dev/ptname for the device number. We check
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103 | * all of the likely device directories. If we don't find it, or if
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104 | * the stat information doesn't check out, use blkid_devno_to_devname()
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105 | * to find it via an exhaustive search for the device major/minor.
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106 | */
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107 | for (dir = blkid_devdirs; *dir; dir++) {
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108 | struct stat st;
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109 | char device[256];
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110 |
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111 | sprintf(device, "%s/%s", *dir, ptname);
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112 | if ((dev = blkid_get_dev(cache, device, BLKID_DEV_FIND)) &&
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113 | dev->bid_devno == devno)
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114 | goto set_pri;
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115 |
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116 | if (stat(device, &st) == 0 && S_ISBLK(st.st_mode) &&
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117 | st.st_rdev == devno) {
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118 | devname = blkid_strdup(device);
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119 | break;
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120 | }
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121 | }
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122 | if (!devname) {
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123 | devname = blkid_devno_to_devname(devno);
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124 | if (!devname)
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125 | return;
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126 | }
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127 | dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
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128 | free(devname);
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129 |
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130 | set_pri:
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131 | if (!pri && !strncmp(ptname, "md", 2))
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132 | pri = BLKID_PRI_MD;
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133 | if (dev)
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134 | dev->bid_pri = pri;
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135 | return;
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136 | }
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137 |
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138 | #define PROC_PARTITIONS "/proc/partitions"
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139 | #define VG_DIR "/proc/lvm/VGs"
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140 |
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141 | /*
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142 | * This function initializes the UUID cache with devices from the LVM
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143 | * proc hierarchy. We currently depend on the names of the LVM
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144 | * hierarchy giving us the device structure in /dev. (XXX is this a
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145 | * safe thing to do?)
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146 | */
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147 | #ifdef VG_DIR
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148 | #include <dirent.h>
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149 | static dev_t lvm_get_devno(const char *lvm_device)
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150 | {
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151 | FILE *lvf;
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152 | char buf[1024];
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153 | int ma, mi;
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154 | dev_t ret = 0;
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155 |
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156 | DBG(DEBUG_DEVNAME, printf("opening %s\n", lvm_device));
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157 | if ((lvf = fopen(lvm_device, "r")) == NULL) {
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158 | DBG(DEBUG_DEVNAME, printf("%s: (%d) %s\n", lvm_device, errno,
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159 | strerror(errno)));
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160 | return 0;
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161 | }
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162 |
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163 | while (fgets(buf, sizeof(buf), lvf)) {
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164 | if (sscanf(buf, "device: %d:%d", &ma, &mi) == 2) {
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165 | ret = makedev(ma, mi);
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166 | break;
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167 | }
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168 | }
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169 | fclose(lvf);
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170 |
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171 | return ret;
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172 | }
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173 |
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174 | static void lvm_probe_all(blkid_cache cache)
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175 | {
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176 | DIR *vg_list;
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177 | struct dirent *vg_iter;
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178 | int vg_len = strlen(VG_DIR);
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179 | dev_t dev;
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180 |
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181 | if ((vg_list = opendir(VG_DIR)) == NULL)
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182 | return;
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183 |
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184 | DBG(DEBUG_DEVNAME, printf("probing LVM devices under %s\n", VG_DIR));
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185 |
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186 | while ((vg_iter = readdir(vg_list)) != NULL) {
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187 | DIR *lv_list;
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188 | char *vdirname;
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189 | char *vg_name;
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190 | struct dirent *lv_iter;
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191 |
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192 | vg_name = vg_iter->d_name;
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193 | if (!strcmp(vg_name, ".") || !strcmp(vg_name, ".."))
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194 | continue;
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195 | vdirname = xmalloc(vg_len + strlen(vg_name) + 8);
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196 | sprintf(vdirname, "%s/%s/LVs", VG_DIR, vg_name);
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197 |
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198 | lv_list = opendir(vdirname);
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199 | free(vdirname);
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200 | if (lv_list == NULL)
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201 | continue;
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202 |
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203 | while ((lv_iter = readdir(lv_list)) != NULL) {
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204 | char *lv_name, *lvm_device;
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205 |
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206 | lv_name = lv_iter->d_name;
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207 | if (!strcmp(lv_name, ".") || !strcmp(lv_name, ".."))
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208 | continue;
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209 |
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210 | lvm_device = xmalloc(vg_len + strlen(vg_name) +
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211 | strlen(lv_name) + 8);
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212 | sprintf(lvm_device, "%s/%s/LVs/%s", VG_DIR, vg_name,
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213 | lv_name);
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214 | dev = lvm_get_devno(lvm_device);
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215 | sprintf(lvm_device, "%s/%s", vg_name, lv_name);
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216 | DBG(DEBUG_DEVNAME, printf("LVM dev %s: devno 0x%04X\n",
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217 | lvm_device,
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218 | (unsigned int) dev));
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219 | probe_one(cache, lvm_device, dev, BLKID_PRI_LVM);
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220 | free(lvm_device);
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221 | }
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222 | closedir(lv_list);
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223 | }
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224 | closedir(vg_list);
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225 | }
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226 | #endif
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227 |
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228 | #define PROC_EVMS_VOLUMES "/proc/evms/volumes"
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229 |
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230 | static int
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231 | evms_probe_all(blkid_cache cache)
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232 | {
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233 | char line[100];
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234 | int ma, mi, sz, num = 0;
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235 | FILE *procpt;
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236 | char device[110];
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237 |
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238 | procpt = fopen(PROC_EVMS_VOLUMES, "r");
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239 | if (!procpt)
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240 | return 0;
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241 | while (fgets(line, sizeof(line), procpt)) {
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242 | if (sscanf (line, " %d %d %d %*s %*s %[^\n ]",
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243 | &ma, &mi, &sz, device) != 4)
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244 | continue;
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245 |
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246 | DBG(DEBUG_DEVNAME, printf("Checking partition %s (%d, %d)\n",
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247 | device, ma, mi));
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248 |
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249 | probe_one(cache, device, makedev(ma, mi), BLKID_PRI_EVMS);
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250 | num++;
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251 | }
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252 | fclose(procpt);
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253 | return num;
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254 | }
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255 |
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256 | /*
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257 | * Read the device data for all available block devices in the system.
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258 | */
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259 | int blkid_probe_all(blkid_cache cache)
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260 | {
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261 | FILE *proc;
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262 | char line[1024];
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263 | char ptname0[128], ptname1[128], *ptname = 0;
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264 | char *ptnames[2];
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265 | dev_t devs[2];
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266 | int ma, mi;
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267 | unsigned long long sz;
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268 | int lens[2] = { 0, 0 };
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269 | int which = 0, last = 0;
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270 |
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271 | ptnames[0] = ptname0;
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272 | ptnames[1] = ptname1;
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273 |
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274 | if (!cache)
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275 | return -BLKID_ERR_PARAM;
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276 |
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277 | if (cache->bic_flags & BLKID_BIC_FL_PROBED &&
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278 | time(0) - cache->bic_time < BLKID_PROBE_INTERVAL)
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279 | return 0;
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280 |
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281 | blkid_read_cache(cache);
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282 | evms_probe_all(cache);
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283 | #ifdef VG_DIR
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284 | lvm_probe_all(cache);
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285 | #endif
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286 |
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287 | proc = fopen(PROC_PARTITIONS, "r");
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288 | if (!proc)
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289 | return -BLKID_ERR_PROC;
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290 |
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291 | while (fgets(line, sizeof(line), proc)) {
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292 | last = which;
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293 | which ^= 1;
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294 | ptname = ptnames[which];
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295 |
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296 | if (sscanf(line, " %d %d %llu %128[^\n ]",
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297 | &ma, &mi, &sz, ptname) != 4)
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298 | continue;
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299 | devs[which] = makedev(ma, mi);
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300 |
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301 | DBG(DEBUG_DEVNAME, printf("read partition name %s\n", ptname));
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302 |
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303 | /* Skip whole disk devs unless they have no partitions
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304 | * If we don't have a partition on this dev, also
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305 | * check previous dev to see if it didn't have a partn.
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306 | * heuristic: partition name ends in a digit.
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307 | *
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308 | * Skip extended partitions.
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309 | * heuristic: size is 1
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310 | *
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311 | * FIXME: skip /dev/{ida,cciss,rd} whole-disk devs
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312 | */
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313 |
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314 | lens[which] = strlen(ptname);
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315 | if (isdigit(ptname[lens[which] - 1])) {
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316 | DBG(DEBUG_DEVNAME,
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317 | printf("partition dev %s, devno 0x%04X\n",
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318 | ptname, (unsigned int) devs[which]));
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319 |
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320 | if (sz > 1)
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321 | probe_one(cache, ptname, devs[which], 0);
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322 | lens[which] = 0;
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323 | lens[last] = 0;
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324 | } else if (lens[last] && strncmp(ptnames[last], ptname,
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325 | lens[last])) {
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326 | DBG(DEBUG_DEVNAME,
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327 | printf("whole dev %s, devno 0x%04X\n",
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328 | ptnames[last], (unsigned int) devs[last]));
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329 | probe_one(cache, ptnames[last], devs[last], 0);
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330 | lens[last] = 0;
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331 | }
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332 | }
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333 |
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334 | /* Handle the last device if it wasn't partitioned */
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335 | if (lens[which])
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336 | probe_one(cache, ptname, devs[which], 0);
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337 |
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338 | fclose(proc);
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339 |
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340 | cache->bic_time = time(0);
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341 | cache->bic_flags |= BLKID_BIC_FL_PROBED;
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342 | blkid_flush_cache(cache);
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343 | return 0;
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344 | }
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345 |
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346 | #ifdef TEST_PROGRAM
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347 | int main(int argc, char **argv)
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348 | {
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349 | blkid_cache cache = NULL;
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350 | int ret;
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351 |
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352 | blkid_debug_mask = DEBUG_ALL;
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353 | if (argc != 1) {
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354 | fprintf(stderr, "Usage: %s\n"
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355 | "Probe all devices and exit\n", argv[0]);
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356 | exit(1);
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357 | }
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358 | if ((ret = blkid_get_cache(&cache, bb_dev_null)) != 0) {
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359 | fprintf(stderr, "%s: error creating cache (%d)\n",
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360 | argv[0], ret);
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361 | exit(1);
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362 | }
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363 | if (blkid_probe_all(cache) < 0)
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364 | printf("%s: error probing devices\n", argv[0]);
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365 |
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366 | blkid_put_cache(cache);
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367 | return (0);
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368 | }
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369 | #endif
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