2003-01-24 00:45:16 +03:00
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/*
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* devname.c - get a dev by its device inode name
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*
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* Copyright (C) Andries Brouwer
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2003-01-26 02:44:33 +03:00
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* Copyright (C) 1999, 2000, 2001, 2002, 2003 Theodore Ts'o
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2003-01-24 00:45:16 +03:00
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* Copyright (C) 2001 Andreas Dilger
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the
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* GNU Lesser General Public License.
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* %End-Header%
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*/
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#include <stdio.h>
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#include <string.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#if HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#if HAVE_SYS_MKDEV_H
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#include <sys/mkdev.h>
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#endif
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#include <time.h>
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2003-01-26 09:54:39 +03:00
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#include "blkidP.h"
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2003-01-24 00:45:16 +03:00
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/* #define DEBUG_DEVNAME */
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#ifdef DEBUG_DEVNAME
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2003-01-25 08:26:48 +03:00
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#define DBG(x) x
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2003-01-24 00:45:16 +03:00
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#else
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2003-01-25 08:26:48 +03:00
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#define DBG(x)
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2003-01-24 00:45:16 +03:00
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#endif
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/*
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* Find a dev struct in the cache by device name, if available.
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*/
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2003-01-26 09:54:39 +03:00
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blkid_dev blkid_find_devname(blkid_cache cache, const char *devname)
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2003-01-24 00:45:16 +03:00
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{
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2003-01-26 09:54:39 +03:00
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blkid_dev dev = NULL;
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2003-01-24 00:45:16 +03:00
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struct list_head *p;
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if (!cache || !devname)
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return NULL;
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list_for_each(p, &cache->bic_devs) {
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2003-01-26 09:54:39 +03:00
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blkid_dev tmp = list_entry(p, struct blkid_struct_dev, bid_devs);
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2003-01-24 00:45:16 +03:00
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if (strcmp(tmp->bid_name, devname))
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continue;
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2003-01-25 08:26:48 +03:00
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DBG(printf("found devname %s in cache\n", tmp->bid_name));
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2003-01-24 00:45:16 +03:00
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dev = blkid_verify_devname(cache, tmp);
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break;
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}
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return dev;
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}
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/*
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* Return a pointer to an dev struct, either from cache or by probing.
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*/
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2003-01-26 09:54:39 +03:00
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blkid_dev blkid_get_devname(blkid_cache cache, const char *devname)
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2003-01-24 00:45:16 +03:00
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{
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2003-01-26 09:54:39 +03:00
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blkid_dev dev;
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2003-01-24 00:45:16 +03:00
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if ((dev = blkid_find_devname(cache, devname)))
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return dev;
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dev = blkid_devname_to_dev(devname, 0);
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return blkid_add_dev_to_cache(cache, dev);
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}
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/*
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* Probe a single block device to add to the device cache.
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* If the size is not specified, it will be found in blkid_devname_to_dev().
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*/
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2003-01-26 09:54:39 +03:00
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static blkid_dev probe_one(blkid_cache cache, const char *ptname,
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2003-01-24 00:45:16 +03:00
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int major, int minor, unsigned long long size)
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{
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dev_t devno = makedev(major, minor);
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2003-01-26 09:54:39 +03:00
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blkid_dev dev;
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2003-01-24 00:45:16 +03:00
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const char **dir;
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char *devname = NULL;
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/* See if we already have this device number in the cache. */
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if ((dev = blkid_find_devno(cache, devno)))
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return dev;
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/*
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* Take a quick look at /dev/ptname for the device number. We check
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* all of the likely device directories. If we don't find it, or if
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* the stat information doesn't check out, use blkid_devno_to_devname()
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* to find it via an exhaustive search for the device major/minor.
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*/
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for (dir = devdirs; *dir; dir++) {
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struct stat st;
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char device[256];
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sprintf(device, "%s/%s", *dir, ptname);
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if ((dev = blkid_find_devname(cache, device)) &&
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dev->bid_devno == devno)
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return dev;
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if (stat(device, &st) == 0 && st.st_rdev == devno) {
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devname = string_copy(device);
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break;
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}
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}
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if (!devname) {
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devname = blkid_devno_to_devname(devno);
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if (!devname)
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return NULL;
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}
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dev = blkid_devname_to_dev(devname, size);
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string_free(devname);
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return blkid_add_dev_to_cache(cache, dev);
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}
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#define PROC_PARTITIONS "/proc/partitions"
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#define VG_DIR "/proc/lvm/VGs"
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/*
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* This function initializes the UUID cache with devices from the LVM
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* proc hierarchy. We currently depend on the names of the LVM
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* hierarchy giving us the device structure in /dev. (XXX is this a
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* safe thing to do?)
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*/
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#ifdef VG_DIR
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#include <dirent.h>
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static int lvm_get_devno(const char *lvm_device, int *major, int *minor,
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blkid_loff_t *size)
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{
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FILE *lvf;
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char buf[1024];
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int ret = 1;
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*major = *minor = 0;
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*size = 0;
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2003-01-25 08:26:48 +03:00
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DBG(printf("opening %s\n", lvm_device));
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2003-01-24 00:45:16 +03:00
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if ((lvf = fopen(lvm_device, "r")) == NULL) {
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ret = errno;
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2003-01-25 08:26:48 +03:00
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DBG(printf("%s: (%d) %s\n", lvm_device, ret, strerror(ret)));
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2003-01-24 00:45:16 +03:00
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return -ret;
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}
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while (fgets(buf, sizeof(buf), lvf)) {
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2003-01-25 08:26:48 +03:00
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if (sscanf(buf, "size: %llu", size) == 1) { /* sectors */
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2003-01-24 00:45:16 +03:00
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*size <<= 9;
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}
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if (sscanf(buf, "device: %d:%d", major, minor) == 2) {
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ret = 0;
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break;
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}
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}
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fclose(lvf);
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return ret;
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}
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2003-01-26 09:54:39 +03:00
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static void lvm_probe_all(blkid_cache *cache)
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2003-01-24 00:45:16 +03:00
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{
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DIR *vg_list;
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struct dirent *vg_iter;
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int vg_len = strlen(VG_DIR);
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if ((vg_list = opendir(VG_DIR)) == NULL)
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return;
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2003-01-25 08:26:48 +03:00
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DBG(printf("probing LVM devices under %s\n", VG_DIR));
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2003-01-24 00:45:16 +03:00
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while ((vg_iter = readdir(vg_list)) != NULL) {
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DIR *lv_list;
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char *vdirname;
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char *vg_name;
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struct dirent *lv_iter;
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vg_name = vg_iter->d_name;
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if (!strcmp(vg_name, ".") || !strcmp(vg_name, ".."))
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continue;
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vdirname = malloc(vg_len + strlen(vg_name) + 8);
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if (!vdirname)
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goto exit;
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sprintf(vdirname, "%s/%s/LVs", VG_DIR, vg_name);
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lv_list = opendir(vdirname);
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free(vdirname);
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if (lv_list == NULL)
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continue;
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while ((lv_iter = readdir(lv_list)) != NULL) {
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char *lv_name, *lvm_device;
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int major, minor;
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blkid_loff_t size;
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lv_name = lv_iter->d_name;
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if (!strcmp(lv_name, ".") || !strcmp(lv_name, ".."))
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continue;
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lvm_device = malloc(vg_len + strlen(vg_name) +
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strlen(lv_name) + 8);
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if (!lvm_device) {
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closedir(lv_list);
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goto exit;
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}
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sprintf(lvm_device, "%s/%s/LVs/%s", VG_DIR, vg_name,
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lv_name);
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if (lvm_get_devno(lvm_device, &major, &minor, &size)) {
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free(lvm_device);
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continue;
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}
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sprintf(lvm_device, "%s/%s", vg_name, lv_name);
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2003-01-25 08:26:48 +03:00
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DBG(printf("LVM dev %s: devno 0x%02X%02X, size %Ld\n",
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lvm_device, major, minor, size));
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2003-01-24 00:45:16 +03:00
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probe_one(*cache, lvm_device, major, minor, size);
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free(lvm_device);
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}
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closedir(lv_list);
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}
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exit:
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closedir(vg_list);
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}
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#endif
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2003-01-26 02:44:33 +03:00
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#define PROC_EVMS_VOLUMES "/proc/evms/volumes"
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static int
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2003-01-26 09:54:39 +03:00
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evms_probe_all(blkid_cache *cache)
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2003-01-26 02:44:33 +03:00
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{
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char line[100];
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int ma, mi, sz, num = 0;
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FILE *procpt;
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char device[110];
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procpt = fopen(PROC_EVMS_VOLUMES, "r");
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if (!procpt)
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return 0;
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while (fgets(line, sizeof(line), procpt)) {
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if (sscanf (line, " %d %d %d %*s %*s %[^\n ]",
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&ma, &mi, &sz, device) != 4)
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continue;
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DBG(printf("Checking partition %s (%d, %d)\n",
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device, ma, mi));
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probe_one(*cache, device, ma, mi, sz << 10);
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num++;
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}
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fclose(procpt);
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return num;
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}
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2003-01-24 00:45:16 +03:00
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/*
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* Read the device data for all available block devices in the system.
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*/
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2003-01-26 09:54:39 +03:00
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int blkid_probe_all(blkid_cache *cache)
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2003-01-24 00:45:16 +03:00
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{
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FILE *proc;
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int firstPass;
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if (!cache)
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return -BLKID_ERR_PARAM;
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if (!*cache)
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*cache = blkid_new_cache();
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if (!*cache)
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return -BLKID_ERR_MEM;
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if ((*cache)->bic_flags & BLKID_BIC_FL_PROBED &&
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time(0) - (*cache)->bic_time < BLKID_PROBE_INTERVAL)
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return 0;
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2003-01-26 02:44:33 +03:00
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if (evms_probe_all(cache))
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goto finish;
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2003-01-24 00:45:16 +03:00
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#ifdef VG_DIR
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lvm_probe_all(cache);
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#endif
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proc = fopen(PROC_PARTITIONS, "r");
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if (!proc)
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return -BLKID_ERR_PROC;
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for (firstPass = 1; firstPass >= 0; firstPass--) {
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char line[1024];
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char ptname0[128], ptname1[128];
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char *ptnames[2] = { ptname0, ptname1 };
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int majors[2], minors[2];
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unsigned long long sizes[2];
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int lens[2] = { 0, 0 };
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int handleOnFirst;
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int which = 0, last = 0;
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fseek(proc, 0, SEEK_SET);
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while (fgets(line, sizeof(line), proc)) {
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last = which;
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which ^= 1;
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|
2003-01-25 08:26:48 +03:00
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if (sscanf(line, " %d %d %lld %128[^\n ]",
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2003-01-24 00:45:16 +03:00
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&majors[which], &minors[which],
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&sizes[which], ptnames[which]) != 4)
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continue;
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2003-01-25 08:26:48 +03:00
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DBG(printf("read partition name %s\n", ptnames[which]));
|
2003-01-24 00:45:16 +03:00
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/* look only at md devices on first pass */
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handleOnFirst = !strncmp(ptnames[which], "md", 2);
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if (firstPass != handleOnFirst)
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continue;
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/* Skip whole disk devs unless they have no partitions
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* If we don't have a partition on this dev, also
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* check previous dev to see if it didn't have a partn.
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* heuristic: partition name ends in a digit.
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*
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* Skip extended partitions.
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* heuristic: size is 1
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*
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* FIXME: skip /dev/{ida,cciss,rd} whole-disk devs
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*/
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lens[which] = strlen(ptnames[which]);
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if (isdigit(ptnames[which][lens[which] - 1])) {
|
2003-01-25 08:26:48 +03:00
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DBG(printf("partition dev %s, devno 0x%02X%02X\n",
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ptnames[which], majors[which],
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minors[which]));
|
2003-01-24 00:45:16 +03:00
|
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if (sizes[which] > 1)
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probe_one(*cache, ptnames[which],
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majors[which], minors[which],
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sizes[which] << 10);
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lens[which] = 0;
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lens[last] = 0;
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|
|
|
} else if (lens[last] &&
|
|
|
|
strncmp(ptnames[last], ptnames[which],
|
|
|
|
lens[last])) {
|
2003-01-25 08:26:48 +03:00
|
|
|
DBG(printf("whole dev %s, devno 0x%02X%02X\n",
|
|
|
|
ptnames[last], majors[last],
|
|
|
|
minors[last]));
|
2003-01-24 00:45:16 +03:00
|
|
|
probe_one(*cache, ptnames[last], majors[last],
|
|
|
|
minors[last], sizes[last] << 10);
|
|
|
|
lens[last] = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Handle the last device if it wasn't partitioned */
|
|
|
|
if (lens[which])
|
|
|
|
probe_one(*cache, ptnames[which], majors[which],
|
|
|
|
minors[which], sizes[which] << 10);
|
|
|
|
}
|
|
|
|
fclose(proc);
|
|
|
|
|
2003-01-26 02:44:33 +03:00
|
|
|
finish:
|
2003-01-24 00:45:16 +03:00
|
|
|
(*cache)->bic_time = time(0);
|
|
|
|
(*cache)->bic_flags |= BLKID_BIC_FL_PROBED;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef TEST_PROGRAM
|
|
|
|
int main(int argc, char **argv)
|
|
|
|
{
|
2003-01-26 09:54:39 +03:00
|
|
|
blkid_cache cache = NULL;
|
2003-01-24 00:45:16 +03:00
|
|
|
|
|
|
|
if (argc != 1) {
|
|
|
|
fprintf(stderr, "Usage: %s\n"
|
|
|
|
"Probe all devices and exit\n", argv[0]);
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
if (blkid_probe_all(&cache) < 0)
|
|
|
|
printf("%s: error probing devices\n", argv[0]);
|
|
|
|
|
|
|
|
blkid_free_cache(cache);
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
#endif
|