[821] | 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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