1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * devname.c - get a dev by its device inode name
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4 | *
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5 | * Copyright (C) Andries Brouwer
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6 | * Copyright (C) 1999, 2000, 2001, 2002, 2003 Theodore Ts'o
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7 | * Copyright (C) 2001 Andreas Dilger
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8 | *
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9 | * %Begin-Header%
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10 | * This file may be redistributed under the terms of the
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11 | * GNU Lesser General Public License.
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12 | * %End-Header%
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13 | */
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14 |
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15 | #include <stdio.h>
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16 | #include <string.h>
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17 | #ifdef HAVE_UNISTD_H
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18 | #include <unistd.h>
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19 | #endif
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20 | #include <stdlib.h>
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21 | #include <string.h>
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22 | #include <ctype.h>
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23 | #ifdef HAVE_SYS_TYPES_H
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24 | #include <sys/types.h>
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25 | #endif
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26 | #include <sys/stat.h>
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27 | #ifdef HAVE_ERRNO_H
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28 | #include <errno.h>
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29 | #endif
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30 | #ifdef HAVE_SYS_MKDEV_H
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31 | #include <sys/mkdev.h>
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32 | #endif
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33 | #include <time.h>
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34 |
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35 | #include "blkidP.h"
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36 |
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37 | /*
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38 | * Find a dev struct in the cache by device name, if available.
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39 | *
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40 | * If there is no entry with the specified device name, and the create
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41 | * flag is set, then create an empty device entry.
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42 | */
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43 | blkid_dev blkid_get_dev(blkid_cache cache, const char *devname, int flags)
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44 | {
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45 | blkid_dev dev = NULL, tmp;
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46 | struct list_head *p;
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47 |
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48 | if (!cache || !devname)
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49 | return NULL;
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50 |
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51 | list_for_each(p, &cache->bic_devs) {
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52 | tmp = list_entry(p, struct blkid_struct_dev, bid_devs);
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53 | if (strcmp(tmp->bid_name, devname))
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54 | continue;
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55 |
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56 | DBG(DEBUG_DEVNAME,
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57 | printf("found devname %s in cache\n", tmp->bid_name));
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58 | dev = tmp;
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59 | break;
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60 | }
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61 |
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62 | if (!dev && (flags & BLKID_DEV_CREATE)) {
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63 | dev = blkid_new_dev();
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64 | if (!dev)
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65 | return NULL;
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66 | dev->bid_name = blkid_strdup(devname);
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67 | dev->bid_cache = cache;
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68 | list_add_tail(&dev->bid_devs, &cache->bic_devs);
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69 | cache->bic_flags |= BLKID_BIC_FL_CHANGED;
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70 | }
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71 |
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72 | if (flags & BLKID_DEV_VERIFY)
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73 | dev = blkid_verify(cache, dev);
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74 | return dev;
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75 | }
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76 |
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77 | /*
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78 | * Probe a single block device to add to the device cache.
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79 | */
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80 | static void probe_one(blkid_cache cache, const char *ptname,
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81 | dev_t devno, int pri)
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82 | {
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83 | blkid_dev dev = NULL;
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84 | struct list_head *p;
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85 | const char **dir;
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86 | char *devname = NULL;
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87 |
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88 | /* See if we already have this device number in the cache. */
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89 | list_for_each(p, &cache->bic_devs) {
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90 | blkid_dev tmp = list_entry(p, struct blkid_struct_dev,
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91 | bid_devs);
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92 | if (tmp->bid_devno == devno) {
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93 | dev = blkid_verify(cache, tmp);
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94 | break;
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95 | }
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96 | }
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97 | if (dev && dev->bid_devno == devno)
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98 | goto set_pri;
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99 |
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100 | /*
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101 | * Take a quick look at /dev/ptname for the device number. We check
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102 | * all of the likely device directories. If we don't find it, or if
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103 | * the stat information doesn't check out, use blkid_devno_to_devname()
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104 | * to find it via an exhaustive search for the device major/minor.
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105 | */
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106 | for (dir = blkid_devdirs; *dir; dir++) {
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107 | struct stat st;
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108 | char device[256];
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109 |
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110 | sprintf(device, "%s/%s", *dir, ptname);
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111 | if ((dev = blkid_get_dev(cache, device, BLKID_DEV_FIND)) &&
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112 | dev->bid_devno == devno)
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113 | goto set_pri;
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114 |
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115 | if (stat(device, &st) == 0 && S_ISBLK(st.st_mode) &&
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116 | st.st_rdev == devno) {
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117 | devname = blkid_strdup(device);
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118 | break;
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119 | }
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120 | }
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121 | if (!devname) {
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122 | devname = blkid_devno_to_devname(devno);
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123 | if (!devname)
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124 | return;
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125 | }
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126 | dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
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127 | free(devname);
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128 |
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129 | set_pri:
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130 | if (!pri && !strncmp(ptname, "md", 2))
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131 | pri = BLKID_PRI_MD;
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132 | if (dev)
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133 | dev->bid_pri = pri;
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134 | }
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135 |
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136 | #define PROC_PARTITIONS "/proc/partitions"
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137 | #define VG_DIR "/proc/lvm/VGs"
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138 |
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139 | /*
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140 | * This function initializes the UUID cache with devices from the LVM
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141 | * proc hierarchy. We currently depend on the names of the LVM
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142 | * hierarchy giving us the device structure in /dev. (XXX is this a
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143 | * safe thing to do?)
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144 | */
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145 | #ifdef VG_DIR
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146 | #include <dirent.h>
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147 | static dev_t lvm_get_devno(const char *lvm_device)
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148 | {
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149 | FILE *lvf;
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150 | char buf[1024];
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151 | int ma, mi;
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152 | dev_t ret = 0;
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153 |
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154 | DBG(DEBUG_DEVNAME, printf("opening %s\n", lvm_device));
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155 | if ((lvf = fopen(lvm_device, "r")) == NULL) {
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156 | DBG(DEBUG_DEVNAME, printf("%s: (%d) %s\n", lvm_device, errno,
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157 | strerror(errno)));
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158 | return 0;
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159 | }
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160 |
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161 | while (fgets(buf, sizeof(buf), lvf)) {
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162 | if (sscanf(buf, "device: %d:%d", &ma, &mi) == 2) {
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163 | ret = makedev(ma, mi);
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164 | break;
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165 | }
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166 | }
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167 | fclose(lvf);
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168 |
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169 | return ret;
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170 | }
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171 |
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172 | static void lvm_probe_all(blkid_cache cache)
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173 | {
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174 | DIR *vg_list;
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175 | struct dirent *vg_iter;
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176 | int vg_len = strlen(VG_DIR);
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177 | dev_t dev;
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178 |
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179 | if ((vg_list = opendir(VG_DIR)) == NULL)
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180 | return;
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181 |
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182 | DBG(DEBUG_DEVNAME, printf("probing LVM devices under %s\n", VG_DIR));
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183 |
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184 | while ((vg_iter = readdir(vg_list)) != NULL) {
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185 | DIR *lv_list;
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186 | char *vdirname;
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187 | char *vg_name;
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188 | struct dirent *lv_iter;
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189 |
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190 | vg_name = vg_iter->d_name;
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191 | if (LONE_CHAR(vg_name, '.') || !strcmp(vg_name, ".."))
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192 | continue;
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193 | vdirname = xmalloc(vg_len + strlen(vg_name) + 8);
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194 | sprintf(vdirname, "%s/%s/LVs", VG_DIR, vg_name);
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195 |
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196 | lv_list = opendir(vdirname);
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197 | free(vdirname);
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198 | if (lv_list == NULL)
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199 | continue;
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200 |
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201 | while ((lv_iter = readdir(lv_list)) != NULL) {
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202 | char *lv_name, *lvm_device;
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203 |
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204 | lv_name = lv_iter->d_name;
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205 | if (LONE_CHAR(lv_name, '.') || !strcmp(lv_name, ".."))
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206 | continue;
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207 |
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208 | lvm_device = xmalloc(vg_len + strlen(vg_name) +
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209 | strlen(lv_name) + 8);
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210 | sprintf(lvm_device, "%s/%s/LVs/%s", VG_DIR, vg_name,
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211 | lv_name);
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212 | dev = lvm_get_devno(lvm_device);
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213 | sprintf(lvm_device, "%s/%s", vg_name, lv_name);
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214 | DBG(DEBUG_DEVNAME, printf("LVM dev %s: devno 0x%04X\n",
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215 | lvm_device,
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216 | (unsigned int) dev));
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217 | probe_one(cache, lvm_device, dev, BLKID_PRI_LVM);
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218 | free(lvm_device);
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219 | }
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220 | closedir(lv_list);
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221 | }
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222 | closedir(vg_list);
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223 | }
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224 | #endif
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225 |
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226 | #define PROC_EVMS_VOLUMES "/proc/evms/volumes"
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227 |
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228 | static int
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229 | evms_probe_all(blkid_cache cache)
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230 | {
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231 | char line[100];
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232 | int ma, mi, sz, num = 0;
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233 | FILE *procpt;
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234 | char device[110];
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235 |
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236 | procpt = fopen(PROC_EVMS_VOLUMES, "r");
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237 | if (!procpt)
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238 | return 0;
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239 | while (fgets(line, sizeof(line), procpt)) {
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240 | if (sscanf (line, " %d %d %d %*s %*s %[^\n ]",
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241 | &ma, &mi, &sz, device) != 4)
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242 | continue;
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243 |
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244 | DBG(DEBUG_DEVNAME, printf("Checking partition %s (%d, %d)\n",
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245 | device, ma, mi));
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246 |
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247 | probe_one(cache, device, makedev(ma, mi), BLKID_PRI_EVMS);
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248 | num++;
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249 | }
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250 | fclose(procpt);
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251 | return num;
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252 | }
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253 |
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254 | /*
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255 | * Read the device data for all available block devices in the system.
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256 | */
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257 | int blkid_probe_all(blkid_cache cache)
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258 | {
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259 | FILE *proc;
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260 | char line[1024];
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261 | char ptname0[128], ptname1[128], *ptname = 0;
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262 | char *ptnames[2];
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263 | dev_t devs[2];
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264 | int ma, mi;
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265 | unsigned long long sz;
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266 | int lens[2] = { 0, 0 };
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267 | int which = 0, last = 0;
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268 |
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269 | ptnames[0] = ptname0;
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270 | ptnames[1] = ptname1;
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271 |
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272 | if (!cache)
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273 | return -BLKID_ERR_PARAM;
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274 |
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275 | if (cache->bic_flags & BLKID_BIC_FL_PROBED &&
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276 | time(0) - cache->bic_time < BLKID_PROBE_INTERVAL)
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277 | return 0;
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278 |
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279 | blkid_read_cache(cache);
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280 | evms_probe_all(cache);
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281 | #ifdef VG_DIR
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282 | lvm_probe_all(cache);
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283 | #endif
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284 |
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285 | proc = fopen(PROC_PARTITIONS, "r");
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286 | if (!proc)
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287 | return -BLKID_ERR_PROC;
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288 |
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289 | while (fgets(line, sizeof(line), proc)) {
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290 | last = which;
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291 | which ^= 1;
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292 | ptname = ptnames[which];
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293 |
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294 | if (sscanf(line, " %d %d %llu %128[^\n ]",
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295 | &ma, &mi, &sz, ptname) != 4)
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296 | continue;
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297 | devs[which] = makedev(ma, mi);
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298 |
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299 | DBG(DEBUG_DEVNAME, printf("read partition name %s\n", ptname));
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300 |
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301 | /* Skip whole disk devs unless they have no partitions
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302 | * If we don't have a partition on this dev, also
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303 | * check previous dev to see if it didn't have a partn.
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304 | * heuristic: partition name ends in a digit.
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305 | *
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306 | * Skip extended partitions.
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307 | * heuristic: size is 1
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308 | *
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309 | * FIXME: skip /dev/{ida,cciss,rd} whole-disk devs
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310 | */
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311 |
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312 | lens[which] = strlen(ptname);
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313 | if (isdigit(ptname[lens[which] - 1])) {
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314 | DBG(DEBUG_DEVNAME,
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315 | printf("partition dev %s, devno 0x%04X\n",
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316 | ptname, (unsigned int) devs[which]));
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317 |
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318 | if (sz > 1)
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319 | probe_one(cache, ptname, devs[which], 0);
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320 | lens[which] = 0;
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321 | lens[last] = 0;
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322 | } else if (lens[last] && strncmp(ptnames[last], ptname,
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323 | lens[last])) {
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324 | DBG(DEBUG_DEVNAME,
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325 | printf("whole dev %s, devno 0x%04X\n",
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326 | ptnames[last], (unsigned int) devs[last]));
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327 | probe_one(cache, ptnames[last], devs[last], 0);
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328 | lens[last] = 0;
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329 | }
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330 | }
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331 |
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332 | /* Handle the last device if it wasn't partitioned */
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333 | if (lens[which])
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334 | probe_one(cache, ptname, devs[which], 0);
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335 |
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336 | fclose(proc);
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337 |
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338 | cache->bic_time = time(0);
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339 | cache->bic_flags |= BLKID_BIC_FL_PROBED;
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340 | blkid_flush_cache(cache);
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341 | return 0;
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342 | }
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343 |
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344 | #ifdef TEST_PROGRAM
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345 | int main(int argc, char **argv)
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346 | {
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347 | blkid_cache cache = NULL;
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348 | int ret;
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349 |
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350 | blkid_debug_mask = DEBUG_ALL;
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351 | if (argc != 1) {
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352 | fprintf(stderr, "Usage: %s\n"
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353 | "Probe all devices and exit\n", argv[0]);
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354 | exit(1);
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355 | }
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356 | if ((ret = blkid_get_cache(&cache, bb_dev_null)) != 0) {
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357 | fprintf(stderr, "%s: error creating cache (%d)\n",
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358 | argv[0], ret);
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359 | exit(1);
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360 | }
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361 | if (blkid_probe_all(cache) < 0)
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362 | printf("%s: error probing devices\n", argv[0]);
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363 |
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364 | blkid_put_cache(cache);
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365 | return 0;
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366 | }
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367 | #endif
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