[thirdparty/util-linux.git] / libblkid / src / devname.c

/*
 * devname.c - get a dev by its device inode name
 *
 * Copyright (C) Andries Brouwer
 * Copyright (C) 1999, 2000, 2001, 2002, 2003 Theodore Ts'o
 * Copyright (C) 2001 Andreas Dilger
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the
 * GNU Lesser General Public License.
 * %End-Header%
 */

#define _GNU_SOURCE 1

#include <stdio.h>
#include <string.h>
#include <limits.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include <ctype.h>
#include <fcntl.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <dirent.h>
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include <time.h>

#include "blkidP.h"

#include "canonicalize.h"		/* $(top_srcdir)/include */
#include "pathnames.h"
#include "sysfs.h"

/*
 * Find a dev struct in the cache by device name, if available.
 *
 * If there is no entry with the specified device name, and the create
 * flag is set, then create an empty device entry.
 */
blkid_dev blkid_get_dev(blkid_cache cache, const char *devname, int flags)
{
	blkid_dev dev = NULL, tmp;
	struct list_head *p, *pnext;
	char *cn = NULL;

	if (!cache || !devname)
		return NULL;

	/* search by name */
	list_for_each(p, &cache->bic_devs) {
		tmp = list_entry(p, struct blkid_struct_dev, bid_devs);
		if (strcmp(tmp->bid_name, devname))
			continue;
		dev = tmp;
		break;
	}

	/* try canonicalize the name */
	if (!dev && (cn = canonicalize_path(devname))) {
		if (strcmp(cn, devname) != 0) {
			DBG(DEVNAME, ul_debug("search canonical %s", cn));
			list_for_each(p, &cache->bic_devs) {
				tmp = list_entry(p, struct blkid_struct_dev, bid_devs);
				if (strcmp(tmp->bid_name, cn))
					continue;
				dev = tmp;

				/* update name returned by blkid_dev_devname() */
				free(dev->bid_xname);
				dev->bid_xname = strdup(devname);
				break;
			}
		} else {
			free(cn);
			cn = NULL;
		}
	}

	if (!dev && (flags & BLKID_DEV_CREATE)) {
		if (access(devname, F_OK) < 0)
			goto done;
		dev = blkid_new_dev();
		if (!dev)
			goto done;
		dev->bid_time = INT_MIN;
		if (cn) {
			dev->bid_name = cn;
			dev->bid_xname = strdup(devname);
			cn = NULL;	/* see free() below */
		} else
			dev->bid_name = strdup(devname);

		dev->bid_cache = cache;
		list_add_tail(&dev->bid_devs, &cache->bic_devs);
		cache->bic_flags |= BLKID_BIC_FL_CHANGED;
	}

	if (flags & BLKID_DEV_VERIFY) {
		dev = blkid_verify(cache, dev);
		if (!dev || !(dev->bid_flags & BLKID_BID_FL_VERIFIED))
			goto done;
		/*
		 * If the device is verified, then search the blkid
		 * cache for any entries that match on the type, uuid,
		 * and label, and verify them; if a cache entry can
		 * not be verified, then it's stale and so we remove
		 * it.
		 */
		list_for_each_safe(p, pnext, &cache->bic_devs) {
			blkid_dev dev2 = list_entry(p, struct blkid_struct_dev, bid_devs);
			if (dev2->bid_flags & BLKID_BID_FL_VERIFIED)
				continue;
			if (!dev->bid_type || !dev2->bid_type ||
			    strcmp(dev->bid_type, dev2->bid_type))
				continue;
			if (dev->bid_label && dev2->bid_label &&
			    strcmp(dev->bid_label, dev2->bid_label))
				continue;
			if (dev->bid_uuid && dev2->bid_uuid &&
			    strcmp(dev->bid_uuid, dev2->bid_uuid))
				continue;
			if ((dev->bid_label && !dev2->bid_label) ||
			    (!dev->bid_label && dev2->bid_label) ||
			    (dev->bid_uuid && !dev2->bid_uuid) ||
			    (!dev->bid_uuid && dev2->bid_uuid))
				continue;
			dev2 = blkid_verify(cache, dev2);
			if (dev2 && !(dev2->bid_flags & BLKID_BID_FL_VERIFIED))
				blkid_free_dev(dev2);
		}
	}
done:
	if (dev)
		DBG(DEVNAME, ul_debug("%s requested, found %s in cache", devname, dev->bid_name));
	free(cn);
	return dev;
}

/* Directories where we will try to search for device names */
static const char *dirlist[] = { "/dev", "/devfs", "/devices", NULL };

static int is_dm_leaf(const char *devname)
{
	struct dirent	*de, *d_de;
	DIR		*dir, *d_dir;
	char		path[NAME_MAX + 18 + 1];
	int		ret = 1;

	if ((dir = opendir("/sys/block")) == NULL)
		return 0;
	while ((de = readdir(dir)) != NULL) {
		if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, "..") ||
		    !strcmp(de->d_name, devname) ||
		    strncmp(de->d_name, "dm-", 3) ||
		    strlen(de->d_name) > sizeof(path)-32)
			continue;
		sprintf(path, "/sys/block/%s/slaves", de->d_name);
		if ((d_dir = opendir(path)) == NULL)
			continue;
		while ((d_de = readdir(d_dir)) != NULL) {
			if (!strcmp(d_de->d_name, devname)) {
				ret = 0;
				break;
			}
		}
		closedir(d_dir);
		if (!ret)
			break;
	}
	closedir(dir);
	return ret;
}

/*
 * Probe a single block device to add to the device cache.
 */
static void probe_one(blkid_cache cache, const char *ptname,
		      dev_t devno, int pri, int only_if_new, int removable)
{
	blkid_dev dev = NULL;
	struct list_head *p, *pnext;
	const char **dir;
	char *devname = NULL;

	/* See if we already have this device number in the cache. */
	list_for_each_safe(p, pnext, &cache->bic_devs) {
		blkid_dev tmp = list_entry(p, struct blkid_struct_dev,
					   bid_devs);
		if (tmp->bid_devno == devno) {
			if (only_if_new && !access(tmp->bid_name, F_OK))
				return;
			dev = blkid_verify(cache, tmp);
			if (dev && (dev->bid_flags & BLKID_BID_FL_VERIFIED))
				break;
			dev = NULL;
		}
	}
	if (dev && dev->bid_devno == devno)
		goto set_pri;

	/* Try to translate private device-mapper dm-<N> names
	 * to standard /dev/mapper/<name>.
	 */
	if (!strncmp(ptname, "dm-", 3) && isdigit(ptname[3])) {
		devname = canonicalize_dm_name(ptname);
		if (!devname)
			blkid__scan_dir("/dev/mapper", devno, NULL, &devname);
		if (devname)
			goto get_dev;
	}

	/*
	 * Take a quick look at /dev/ptname for the device number.  We check
	 * all of the likely device directories.  If we don't find it, or if
	 * the stat information doesn't check out, use blkid_devno_to_devname()
	 * to find it via an exhaustive search for the device major/minor.
	 */
	for (dir = dirlist; *dir; dir++) {
		struct stat st;
		char device[256];

		snprintf(device, sizeof(device), "%s/%s", *dir, ptname);
		if ((dev = blkid_get_dev(cache, device, BLKID_DEV_FIND)) &&
		    dev->bid_devno == devno)
			goto set_pri;

		if (stat(device, &st) == 0 &&
		    (S_ISBLK(st.st_mode) ||
		     (S_ISCHR(st.st_mode) && !strncmp(ptname, "ubi", 3))) &&
		    st.st_rdev == devno) {
			devname = strdup(device);
			goto get_dev;
		}
	}
	/* Do a short-cut scan of /dev/mapper first */
	if (!devname)
		blkid__scan_dir("/dev/mapper", devno, NULL, &devname);
	if (!devname) {
		devname = blkid_devno_to_devname(devno);
		if (!devname)
			return;
	}

get_dev:
	dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
	free(devname);

set_pri:
	if (dev) {
		if (pri)
			dev->bid_pri = pri;
		else if (!strncmp(dev->bid_name, "/dev/mapper/", 11)) {
			dev->bid_pri = BLKID_PRI_DM;
			if (is_dm_leaf(ptname))
				dev->bid_pri += 5;
		} else if (!strncmp(ptname, "md", 2))
			dev->bid_pri = BLKID_PRI_MD;
		if (removable)
			dev->bid_flags |= BLKID_BID_FL_REMOVABLE;
	}
	return;
}

#define PROC_PARTITIONS "/proc/partitions"
#define VG_DIR		"/proc/lvm/VGs"

/*
 * This function initializes the UUID cache with devices from the LVM
 * proc hierarchy.  We currently depend on the names of the LVM
 * hierarchy giving us the device structure in /dev.  (XXX is this a
 * safe thing to do?)
 */
#ifdef VG_DIR
static dev_t lvm_get_devno(const char *lvm_device)
{
	FILE *lvf;
	char buf[1024];
	int ma, mi;
	dev_t ret = 0;

	DBG(DEVNAME, ul_debug("opening %s", lvm_device));
	if ((lvf = fopen(lvm_device, "r" UL_CLOEXECSTR)) == NULL) {
		DBG(DEVNAME, ul_debug("%s: (%d) %m", lvm_device, errno));
		return 0;
	}

	while (fgets(buf, sizeof(buf), lvf)) {
		if (sscanf(buf, "device: %d:%d", &ma, &mi) == 2) {
			ret = makedev(ma, mi);
			break;
		}
	}
	fclose(lvf);

	return ret;
}

static void lvm_probe_all(blkid_cache cache, int only_if_new)
{
	DIR		*vg_list;
	struct dirent	*vg_iter;
	int		vg_len = strlen(VG_DIR);
	dev_t		dev;

	if ((vg_list = opendir(VG_DIR)) == NULL)
		return;

	DBG(DEVNAME, ul_debug("probing LVM devices under %s", VG_DIR));

	while ((vg_iter = readdir(vg_list)) != NULL) {
		DIR		*lv_list;
		char		*vdirname;
		char		*vg_name;
		struct dirent	*lv_iter;

		vg_name = vg_iter->d_name;
		if (!strcmp(vg_name, ".") || !strcmp(vg_name, ".."))
			continue;
		vdirname = malloc(vg_len + strlen(vg_name) + 8);
		if (!vdirname)
			goto exit;
		sprintf(vdirname, "%s/%s/LVs", VG_DIR, vg_name);

		lv_list = opendir(vdirname);
		free(vdirname);
		if (lv_list == NULL)
			continue;

		while ((lv_iter = readdir(lv_list)) != NULL) {
			char		*lv_name, *lvm_device;

			lv_name = lv_iter->d_name;
			if (!strcmp(lv_name, ".") || !strcmp(lv_name, ".."))
				continue;

			lvm_device = malloc(vg_len + strlen(vg_name) +
					    strlen(lv_name) + 8);
			if (!lvm_device) {
				closedir(lv_list);
				goto exit;
			}
			sprintf(lvm_device, "%s/%s/LVs/%s", VG_DIR, vg_name,
				lv_name);
			dev = lvm_get_devno(lvm_device);
			sprintf(lvm_device, "%s/%s", vg_name, lv_name);
			DBG(DEVNAME, ul_debug("LVM dev %s: devno 0x%04X",
						  lvm_device,
						  (unsigned int) dev));
			probe_one(cache, lvm_device, dev, BLKID_PRI_LVM,
				  only_if_new, 0);
			free(lvm_device);
		}
		closedir(lv_list);
	}
exit:
	closedir(vg_list);
}
#endif

#define PROC_EVMS_VOLUMES "/proc/evms/volumes"

static int
evms_probe_all(blkid_cache cache, int only_if_new)
{
	char line[100];
	int ma, mi, sz, num = 0;
	FILE *procpt;
	char device[110];

	procpt = fopen(PROC_EVMS_VOLUMES, "r" UL_CLOEXECSTR);
	if (!procpt)
		return 0;
	while (fgets(line, sizeof(line), procpt)) {
		if (sscanf (line, " %d %d %d %*s %*s %[^\n ]",
			    &ma, &mi, &sz, device) != 4)
			continue;

		DBG(DEVNAME, ul_debug("Checking partition %s (%d, %d)",
					  device, ma, mi));

		probe_one(cache, device, makedev(ma, mi), BLKID_PRI_EVMS,
			  only_if_new, 0);
		num++;
	}
	fclose(procpt);
	return num;
}

static void
ubi_probe_all(blkid_cache cache, int only_if_new)
{
	const char **dirname;

	for (dirname = dirlist; *dirname; dirname++) {
		DIR		*dir;
		struct dirent	*iter;

		DBG(DEVNAME, ul_debug("probing UBI volumes under %s",
					  *dirname));

		dir = opendir(*dirname);
		if (dir == NULL)
			continue ;

		while ((iter = readdir(dir)) != NULL) {
			char		*name;
			struct stat	st;
			dev_t		dev;

			name = iter->d_name;
#ifdef _DIRENT_HAVE_D_TYPE
			if (iter->d_type != DT_UNKNOWN &&
			    iter->d_type != DT_CHR && iter->d_type != DT_LNK)
				continue;
#endif
			if (!strcmp(name, ".") || !strcmp(name, "..") ||
			    !strstr(name, "ubi"))
				continue;
			if (!strcmp(name, "ubi_ctrl"))
				continue;
			if (fstatat(dirfd(dir), name, &st, 0))
				continue;

			dev = st.st_rdev;

			if (!S_ISCHR(st.st_mode) || !minor(dev))
				continue;
			DBG(DEVNAME, ul_debug("UBI vol %s/%s: devno 0x%04X",
				  *dirname, name, (int) dev));
			probe_one(cache, name, dev, BLKID_PRI_UBI, only_if_new, 0);
		}
		closedir(dir);
	}
}

/*
 * Read the device data for all available block devices in the system.
 */
static int probe_all(blkid_cache cache, int only_if_new)
{
	FILE *proc;
	char line[1024];
	char ptname0[128 + 1], ptname1[128 + 1], *ptname = NULL;
	char *ptnames[2];
	dev_t devs[2] = { 0, 0 };
	int iswhole[2] = { 0, 0 };
	int ma, mi;
	unsigned long long sz;
	int lens[2] = { 0, 0 };
	int which = 0, last = 0;
	struct list_head *p, *pnext;

	ptnames[0] = ptname0;
	ptnames[1] = ptname1;

	if (!cache)
		return -BLKID_ERR_PARAM;

	if (cache->bic_flags & BLKID_BIC_FL_PROBED &&
	    time(NULL) - cache->bic_time < BLKID_PROBE_INTERVAL)
		return 0;

	blkid_read_cache(cache);
	evms_probe_all(cache, only_if_new);
#ifdef VG_DIR
	lvm_probe_all(cache, only_if_new);
#endif
	ubi_probe_all(cache, only_if_new);

	proc = fopen(PROC_PARTITIONS, "r" UL_CLOEXECSTR);
	if (!proc)
		return -BLKID_ERR_PROC;

	while (fgets(line, sizeof(line), proc)) {
		last = which;
		which ^= 1;
		ptname = ptnames[which];

		if (sscanf(line, " %d %d %llu %128[^\n ]",
			   &ma, &mi, &sz, ptname) != 4)
			continue;
		devs[which] = makedev(ma, mi);

		DBG(DEVNAME, ul_debug("read device name %s", ptname));

		/* Skip whole disk devs unless they have no partitions.
		 * If base name of device has changed, also
		 * check previous dev to see if it didn't have a partn.
		 * heuristic: partition name ends in a digit, & partition
		 * names contain whole device name as substring.
		 *
		 * Skip extended partitions.
		 * heuristic: size is 1
		 */

		lens[which] = strlen(ptname);
		iswhole[which] = sysfs_devno_is_wholedisk(devs[which]);

		/* probably partition, so check */
		if (!iswhole[which]) {
			DBG(DEVNAME, ul_debug(" partition dev %s, devno 0x%04X",
				   ptname, (unsigned int) devs[which]));

			if (sz > 1)
				probe_one(cache, ptname, devs[which], 0,
					  only_if_new, 0);
			lens[which] = 0;	/* mark as checked */
		}

		/*
		 * If last was a whole disk and we just found a partition
		 * on it, remove the whole-disk dev from the cache if
		 * it exists.
		 */
		if (lens[last] && iswhole[last]
		    && !strncmp(ptnames[last], ptname, lens[last])) {

			list_for_each_safe(p, pnext, &cache->bic_devs) {
				blkid_dev tmp;

				/* find blkid dev for the whole-disk devno */
				tmp = list_entry(p, struct blkid_struct_dev,
						 bid_devs);
				if (tmp->bid_devno == devs[last]) {
					DBG(DEVNAME, ul_debug(" freeing %s",
						       tmp->bid_name));
					blkid_free_dev(tmp);
					cache->bic_flags |= BLKID_BIC_FL_CHANGED;
					break;
				}
			}
			lens[last] = 0;		/* mark as checked */
		}
		/*
		 * If last was not checked because it looked like a whole-disk
		 * dev, and the device's base name has changed,
		 * check last as well.
		 */
		if (lens[last] && strncmp(ptnames[last], ptname, lens[last])) {
			DBG(DEVNAME, ul_debug(" whole dev %s, devno 0x%04X",
				   ptnames[last], (unsigned int) devs[last]));
			probe_one(cache, ptnames[last], devs[last], 0,
				  only_if_new, 0);

			lens[last] = 0;		/* mark as checked */
		}
	}

	/* Handle the last device if it wasn't partitioned */
	if (lens[which])
		probe_one(cache, ptname, devs[which], 0, only_if_new, 0);

	fclose(proc);
	blkid_flush_cache(cache);
	return 0;
}

/* Don't use it by default -- it's pretty slow (because cdroms, floppy, ...)
 */
static int probe_all_removable(blkid_cache cache)
{
	struct path_cxt *pc;
	DIR *dir;
	struct dirent *d;

	if (!cache)
		return -BLKID_ERR_PARAM;

	dir = opendir(_PATH_SYS_BLOCK);
	if (!dir)
		return -BLKID_ERR_PROC;

	pc = ul_new_path(NULL);

	while((d = readdir(dir))) {
		int removable = 0;
		dev_t devno;

#ifdef _DIRENT_HAVE_D_TYPE
		if (d->d_type != DT_UNKNOWN && d->d_type != DT_LNK)
			continue;
#endif
		if (d->d_name[0] == '.' &&
		    ((d->d_name[1] == 0) ||
		     ((d->d_name[1] == '.') && (d->d_name[2] == 0))))
			continue;

		devno = sysfs_devname_to_devno(d->d_name);
		if (!devno)
			continue;

		if (sysfs_blkdev_init_path(pc, devno, NULL) == 0
		    && ul_path_read_s32(pc, &removable, "removable") != 0)
				removable = 0;

		if (removable)
			probe_one(cache, d->d_name, devno, 0, 0, 1);
	}

	ul_unref_path(pc);
	closedir(dir);
	return 0;
}


/**
 * blkid_probe_all:
 * @cache: cache handler
 *
 * Probes all block devices.
 *
 * Returns: 0 on success, or number less than zero in case of error.
 */
int blkid_probe_all(blkid_cache cache)
{
	int ret;

	DBG(PROBE, ul_debug("Begin blkid_probe_all()"));
	ret = probe_all(cache, 0);
	if (ret == 0) {
		cache->bic_time = time(NULL);
		cache->bic_flags |= BLKID_BIC_FL_PROBED;
	}
	DBG(PROBE, ul_debug("End blkid_probe_all() [rc=%d]", ret));
	return ret;
}

/**
 * blkid_probe_all_new:
 * @cache: cache handler
 *
 * Probes all new block devices.
 *
 * Returns: 0 on success, or number less than zero in case of error.
 */
int blkid_probe_all_new(blkid_cache cache)
{
	int ret;

	DBG(PROBE, ul_debug("Begin blkid_probe_all_new()"));
	ret = probe_all(cache, 1);
	DBG(PROBE, ul_debug("End blkid_probe_all_new() [rc=%d]", ret));
	return ret;
}

/**
 * blkid_probe_all_removable:
 * @cache: cache handler
 *
 * The libblkid probing is based on devices from /proc/partitions by default.
 * This file usually does not contain removable devices (e.g. CDROMs) and this kind
 * of devices are invisible for libblkid.
 *
 * This function adds removable block devices to @cache (probing is based on
 * information from the /sys directory). Don't forget that removable devices
 * (floppies, CDROMs, ...) could be pretty slow. It's very bad idea to call
 * this function by default.
 *
 * Note that devices which were detected by this function won't be written to
 * blkid.tab cache file.
 *
 * Returns: 0 on success, or number less than zero in case of error.
 */
int blkid_probe_all_removable(blkid_cache cache)
{
	int ret;

	DBG(PROBE, ul_debug("Begin blkid_probe_all_removable()"));
	ret = probe_all_removable(cache);
	DBG(PROBE, ul_debug("End blkid_probe_all_removable() [rc=%d]", ret));
	return ret;
}

#ifdef TEST_PROGRAM
int main(int argc, char **argv)
{
	blkid_cache cache = NULL;
	int ret;

	blkid_init_debug(BLKID_DEBUG_ALL);
	if (argc != 1) {
		fprintf(stderr, "Usage: %s\n"
			"Probe all devices and exit\n", argv[0]);
		exit(1);
	}
	if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) {
		fprintf(stderr, "%s: error creating cache (%d)\n",
			argv[0], ret);
		exit(1);
	}
	if (blkid_probe_all(cache) < 0)
		printf("%s: error probing devices\n", argv[0]);

	if (blkid_probe_all_removable(cache) < 0)
		printf("%s: error probing removable devices\n", argv[0]);

	blkid_put_cache(cache);
	return (0);
}
#endif
Commit	Line	Data
a0948ffe KZ	1	/*
	2	* devname.c - get a dev by its device inode name
	3	*
	4	* Copyright (C) Andries Brouwer
	5	* Copyright (C) 1999, 2000, 2001, 2002, 2003 Theodore Ts'o
	6	* Copyright (C) 2001 Andreas Dilger
	7	*
	8	* %Begin-Header%
	9	* This file may be redistributed under the terms of the
	10	* GNU Lesser General Public License.
	11	* %End-Header%
	12	*/
	13
	14	#define _GNU_SOURCE 1
	15
	16	#include <stdio.h>
	17	#include <string.h>
	18	#include <limits.h>
fbc333fe	19	#ifdef HAVE_UNISTD_H
a0948ffe KZ	20	#include <unistd.h>
	21	#endif
	22	#include <stdlib.h>
a0948ffe	23	#include <ctype.h>
49361dc4	24	#include <fcntl.h>
fbc333fe	25	#ifdef HAVE_SYS_TYPES_H
a0948ffe KZ	26	#include <sys/types.h>
a0948ffe KZ	27	#endif
fd5a4d7f	28	#include <dirent.h>
fbc333fe	29	#ifdef HAVE_SYS_STAT_H
a0948ffe KZ	30	#include <sys/stat.h>
a0948ffe KZ	31	#endif
fbc333fe	32	#ifdef HAVE_ERRNO_H
a0948ffe KZ	33	#include <errno.h>
a0948ffe KZ	34	#endif
a0948ffe KZ	35	#include <time.h>
	36
	37	#include "blkidP.h"
49361dc4	38
a992137b	39	#include "canonicalize.h" /* $(top_srcdir)/include */
49361dc4	40	#include "pathnames.h"
d8a84552	41	#include "sysfs.h"
a0948ffe	42
a0948ffe KZ	43	/*
	44	* Find a dev struct in the cache by device name, if available.
	45	*
	46	* If there is no entry with the specified device name, and the create
	47	* flag is set, then create an empty device entry.
	48	*/
	49	blkid_dev blkid_get_dev(blkid_cache cache, const char *devname, int flags)
	50	{
	51	blkid_dev dev = NULL, tmp;
	52	struct list_head p, pnext;
924c93d9	53	char *cn = NULL;
a0948ffe KZ	54
	55	if (!cache \|\| !devname)
	56	return NULL;
	57
924c93d9	58	/* search by name */
a0948ffe KZ	59	list_for_each(p, &cache->bic_devs) {
	60	tmp = list_entry(p, struct blkid_struct_dev, bid_devs);
	61	if (strcmp(tmp->bid_name, devname))
	62	continue;
a0948ffe KZ	63	dev = tmp;
	64	break;
	65	}
	66
924c93d9 KZ	67	/* try canonicalize the name */
	68	if (!dev && (cn = canonicalize_path(devname))) {
	69	if (strcmp(cn, devname) != 0) {
9e930041	70	DBG(DEVNAME, ul_debug("search canonical %s", cn));
924c93d9 KZ	71	list_for_each(p, &cache->bic_devs) {
	72	tmp = list_entry(p, struct blkid_struct_dev, bid_devs);
	73	if (strcmp(tmp->bid_name, cn))
	74	continue;
	75	dev = tmp;
	76
	77	/* update name returned by blkid_dev_devname() */
	78	free(dev->bid_xname);
	79	dev->bid_xname = strdup(devname);
	80	break;
	81	}
	82	} else {
	83	free(cn);
	84	cn = NULL;
	85	}
	86	}
	87
a0948ffe	88	if (!dev && (flags & BLKID_DEV_CREATE)) {
1de91705	89	if (access(devname, F_OK) < 0)
924c93d9	90	goto done;
a0948ffe KZ	91	dev = blkid_new_dev();
a0948ffe KZ	92	if (!dev)
924c93d9	93	goto done;
a0948ffe	94	dev->bid_time = INT_MIN;
924c93d9 KZ	95	if (cn) {
	96	dev->bid_name = cn;
	97	dev->bid_xname = strdup(devname);
	98	cn = NULL; /* see free() below */
	99	} else
	100	dev->bid_name = strdup(devname);
	101
a0948ffe KZ	102	dev->bid_cache = cache;
	103	list_add_tail(&dev->bid_devs, &cache->bic_devs);
	104	cache->bic_flags \|= BLKID_BIC_FL_CHANGED;
	105	}
	106
	107	if (flags & BLKID_DEV_VERIFY) {
	108	dev = blkid_verify(cache, dev);
	109	if (!dev \|\| !(dev->bid_flags & BLKID_BID_FL_VERIFIED))
924c93d9	110	goto done;
a0948ffe KZ	111	/*
	112	* If the device is verified, then search the blkid
	113	* cache for any entries that match on the type, uuid,
	114	* and label, and verify them; if a cache entry can
	115	* not be verified, then it's stale and so we remove
	116	* it.
	117	*/
	118	list_for_each_safe(p, pnext, &cache->bic_devs) {
b29a6412	119	blkid_dev dev2 = list_entry(p, struct blkid_struct_dev, bid_devs);
a0948ffe KZ	120	if (dev2->bid_flags & BLKID_BID_FL_VERIFIED)
	121	continue;
	122	if (!dev->bid_type \|\| !dev2->bid_type \|\|
	123	strcmp(dev->bid_type, dev2->bid_type))
	124	continue;
	125	if (dev->bid_label && dev2->bid_label &&
	126	strcmp(dev->bid_label, dev2->bid_label))
	127	continue;
	128	if (dev->bid_uuid && dev2->bid_uuid &&
	129	strcmp(dev->bid_uuid, dev2->bid_uuid))
	130	continue;
	131	if ((dev->bid_label && !dev2->bid_label) \|\|
	132	(!dev->bid_label && dev2->bid_label) \|\|
	133	(dev->bid_uuid && !dev2->bid_uuid) \|\|
	134	(!dev->bid_uuid && dev2->bid_uuid))
	135	continue;
	136	dev2 = blkid_verify(cache, dev2);
	137	if (dev2 && !(dev2->bid_flags & BLKID_BID_FL_VERIFIED))
	138	blkid_free_dev(dev2);
	139	}
	140	}
924c93d9 KZ	141	done:
	142	if (dev)
	143	DBG(DEVNAME, ul_debug("%s requested, found %s in cache", devname, dev->bid_name));
	144	free(cn);
a0948ffe KZ	145	return dev;
	146	}
	147
241b6cf3 TT	148	/* Directories where we will try to search for device names */
	149	static const char *dirlist[] = { "/dev", "/devfs", "/devices", NULL };
	150
fd5a4d7f TT	151	static int is_dm_leaf(const char *devname)
	152	{
	153	struct dirent de, d_de;
	154	DIR dir, d_dir;
f64ddc95	155	char path[NAME_MAX + 18 + 1];
fd5a4d7f TT	156	int ret = 1;
	157
	158	if ((dir = opendir("/sys/block")) == NULL)
	159	return 0;
	160	while ((de = readdir(dir)) != NULL) {
	161	if (!strcmp(de->d_name, ".") \|\| !strcmp(de->d_name, "..") \|\|
	162	!strcmp(de->d_name, devname) \|\|
	163	strncmp(de->d_name, "dm-", 3) \|\|
	164	strlen(de->d_name) > sizeof(path)-32)
	165	continue;
	166	sprintf(path, "/sys/block/%s/slaves", de->d_name);
	167	if ((d_dir = opendir(path)) == NULL)
	168	continue;
	169	while ((d_de = readdir(d_dir)) != NULL) {
	170	if (!strcmp(d_de->d_name, devname)) {
	171	ret = 0;
	172	break;
	173	}
	174	}
	175	closedir(d_dir);
	176	if (!ret)
	177	break;
	178	}
	179	closedir(dir);
	180	return ret;
	181	}
	182
a0948ffe KZ	183	/*
	184	* Probe a single block device to add to the device cache.
	185	*/
	186	static void probe_one(blkid_cache cache, const char *ptname,
49361dc4	187	dev_t devno, int pri, int only_if_new, int removable)
a0948ffe KZ	188	{
	189	blkid_dev dev = NULL;
	190	struct list_head p, pnext;
	191	const char **dir;
	192	char *devname = NULL;
	193
	194	/* See if we already have this device number in the cache. */
	195	list_for_each_safe(p, pnext, &cache->bic_devs) {
	196	blkid_dev tmp = list_entry(p, struct blkid_struct_dev,
	197	bid_devs);
a0948ffe KZ	198	if (tmp->bid_devno == devno) {
	199	if (only_if_new && !access(tmp->bid_name, F_OK))
	200	return;
	201	dev = blkid_verify(cache, tmp);
	202	if (dev && (dev->bid_flags & BLKID_BID_FL_VERIFIED))
	203	break;
87918040	204	dev = NULL;
a0948ffe KZ	205	}
	206	}
	207	if (dev && dev->bid_devno == devno)
	208	goto set_pri;
	209
0e1ae8ab KZ	210	/* Try to translate private device-mapper dm-<N> names
	211	* to standard /dev/mapper/<name>.
	212	*/
	213	if (!strncmp(ptname, "dm-", 3) && isdigit(ptname[3])) {
a992137b	214	devname = canonicalize_dm_name(ptname);
6f52b6e9	215	if (!devname)
87918040	216	blkid__scan_dir("/dev/mapper", devno, NULL, &devname);
0e1ae8ab KZ	217	if (devname)
	218	goto get_dev;
	219	}
	220
a0948ffe KZ	221	/*
	222	* Take a quick look at /dev/ptname for the device number. We check
	223	* all of the likely device directories. If we don't find it, or if
	224	* the stat information doesn't check out, use blkid_devno_to_devname()
	225	* to find it via an exhaustive search for the device major/minor.
	226	*/
241b6cf3	227	for (dir = dirlist; *dir; dir++) {
a0948ffe KZ	228	struct stat st;
	229	char device[256];
	230
e3436956	231	snprintf(device, sizeof(device), "%s/%s", *dir, ptname);
a0948ffe KZ	232	if ((dev = blkid_get_dev(cache, device, BLKID_DEV_FIND)) &&
	233	dev->bid_devno == devno)
	234	goto set_pri;
	235
c1ba7962 CC	236	if (stat(device, &st) == 0 &&
	237	(S_ISBLK(st.st_mode) \|\|
	238	(S_ISCHR(st.st_mode) && !strncmp(ptname, "ubi", 3))) &&
a0948ffe	239	st.st_rdev == devno) {
e0a9b8cf	240	devname = strdup(device);
0e1ae8ab	241	goto get_dev;
a0948ffe KZ	242	}
a0948ffe KZ	243	}
241b6cf3 TT	244	/* Do a short-cut scan of /dev/mapper first */
241b6cf3 TT	245	if (!devname)
87918040	246	blkid__scan_dir("/dev/mapper", devno, NULL, &devname);
a0948ffe KZ	247	if (!devname) {
	248	devname = blkid_devno_to_devname(devno);
	249	if (!devname)
	250	return;
	251	}
0e1ae8ab KZ	252
0e1ae8ab KZ	253	get_dev:
a0948ffe KZ	254	dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
	255	free(devname);
	256
	257	set_pri:
241b6cf3 TT	258	if (dev) {
	259	if (pri)
	260	dev->bid_pri = pri;
fd5a4d7f	261	else if (!strncmp(dev->bid_name, "/dev/mapper/", 11)) {
241b6cf3	262	dev->bid_pri = BLKID_PRI_DM;
fd5a4d7f TT	263	if (is_dm_leaf(ptname))
	264	dev->bid_pri += 5;
	265	} else if (!strncmp(ptname, "md", 2))
241b6cf3	266	dev->bid_pri = BLKID_PRI_MD;
49361dc4 KZ	267	if (removable)
49361dc4 KZ	268	dev->bid_flags \|= BLKID_BID_FL_REMOVABLE;
241b6cf3	269	}
a0948ffe KZ	270	return;
	271	}
	272
a0948ffe KZ	273	#define PROC_PARTITIONS "/proc/partitions"
	274	#define VG_DIR "/proc/lvm/VGs"
	275
	276	/*
	277	* This function initializes the UUID cache with devices from the LVM
	278	* proc hierarchy. We currently depend on the names of the LVM
	279	* hierarchy giving us the device structure in /dev. (XXX is this a
	280	* safe thing to do?)
	281	*/
	282	#ifdef VG_DIR
a0948ffe KZ	283	static dev_t lvm_get_devno(const char *lvm_device)
	284	{
	285	FILE *lvf;
	286	char buf[1024];
	287	int ma, mi;
	288	dev_t ret = 0;
	289
c62a6311	290	DBG(DEVNAME, ul_debug("opening %s", lvm_device));
4000fc12	291	if ((lvf = fopen(lvm_device, "r" UL_CLOEXECSTR)) == NULL) {
c62a6311	292	DBG(DEVNAME, ul_debug("%s: (%d) %m", lvm_device, errno));
a0948ffe KZ	293	return 0;
	294	}
	295
	296	while (fgets(buf, sizeof(buf), lvf)) {
	297	if (sscanf(buf, "device: %d:%d", &ma, &mi) == 2) {
	298	ret = makedev(ma, mi);
	299	break;
	300	}
	301	}
	302	fclose(lvf);
	303
	304	return ret;
	305	}
	306
	307	static void lvm_probe_all(blkid_cache cache, int only_if_new)
	308	{
	309	DIR *vg_list;
	310	struct dirent *vg_iter;
	311	int vg_len = strlen(VG_DIR);
	312	dev_t dev;
	313
	314	if ((vg_list = opendir(VG_DIR)) == NULL)
	315	return;
	316
c62a6311	317	DBG(DEVNAME, ul_debug("probing LVM devices under %s", VG_DIR));
a0948ffe KZ	318
	319	while ((vg_iter = readdir(vg_list)) != NULL) {
	320	DIR *lv_list;
	321	char *vdirname;
	322	char *vg_name;
	323	struct dirent *lv_iter;
	324
	325	vg_name = vg_iter->d_name;
	326	if (!strcmp(vg_name, ".") \|\| !strcmp(vg_name, ".."))
	327	continue;
	328	vdirname = malloc(vg_len + strlen(vg_name) + 8);
	329	if (!vdirname)
	330	goto exit;
	331	sprintf(vdirname, "%s/%s/LVs", VG_DIR, vg_name);
	332
	333	lv_list = opendir(vdirname);
	334	free(vdirname);
	335	if (lv_list == NULL)
	336	continue;
	337
	338	while ((lv_iter = readdir(lv_list)) != NULL) {
	339	char lv_name, lvm_device;
	340
	341	lv_name = lv_iter->d_name;
	342	if (!strcmp(lv_name, ".") \|\| !strcmp(lv_name, ".."))
	343	continue;
	344
	345	lvm_device = malloc(vg_len + strlen(vg_name) +
	346	strlen(lv_name) + 8);
	347	if (!lvm_device) {
	348	closedir(lv_list);
	349	goto exit;
	350	}
	351	sprintf(lvm_device, "%s/%s/LVs/%s", VG_DIR, vg_name,
	352	lv_name);
	353	dev = lvm_get_devno(lvm_device);
	354	sprintf(lvm_device, "%s/%s", vg_name, lv_name);
c62a6311	355	DBG(DEVNAME, ul_debug("LVM dev %s: devno 0x%04X",
a0948ffe KZ	356	lvm_device,
	357	(unsigned int) dev));
	358	probe_one(cache, lvm_device, dev, BLKID_PRI_LVM,
49361dc4	359	only_if_new, 0);
a0948ffe KZ	360	free(lvm_device);
	361	}
	362	closedir(lv_list);
	363	}
	364	exit:
	365	closedir(vg_list);
	366	}
	367	#endif
	368
	369	#define PROC_EVMS_VOLUMES "/proc/evms/volumes"
	370
	371	static int
	372	evms_probe_all(blkid_cache cache, int only_if_new)
	373	{
	374	char line[100];
	375	int ma, mi, sz, num = 0;
	376	FILE *procpt;
	377	char device[110];
	378
4000fc12	379	procpt = fopen(PROC_EVMS_VOLUMES, "r" UL_CLOEXECSTR);
a0948ffe KZ	380	if (!procpt)
	381	return 0;
	382	while (fgets(line, sizeof(line), procpt)) {
	383	if (sscanf (line, " %d %d %d %s %s %[^\n ]",
	384	&ma, &mi, &sz, device) != 4)
	385	continue;
	386
c62a6311	387	DBG(DEVNAME, ul_debug("Checking partition %s (%d, %d)",
a0948ffe KZ	388	device, ma, mi));
	389
	390	probe_one(cache, device, makedev(ma, mi), BLKID_PRI_EVMS,
49361dc4	391	only_if_new, 0);
a0948ffe KZ	392	num++;
	393	}
	394	fclose(procpt);
	395	return num;
	396	}
	397
c1ba7962 CC	398	static void
	399	ubi_probe_all(blkid_cache cache, int only_if_new)
	400	{
	401	const char **dirname;
	402
	403	for (dirname = dirlist; *dirname; dirname++) {
c1ba7962 CC	404	DIR *dir;
	405	struct dirent *iter;
	406
c62a6311	407	DBG(DEVNAME, ul_debug("probing UBI volumes under %s",
3acc206d SK	408	*dirname));
3acc206d SK	409
c1ba7962 CC	410	dir = opendir(*dirname);
	411	if (dir == NULL)
	412	continue ;
	413
	414	while ((iter = readdir(dir)) != NULL) {
f38fd19d	415	char *name;
c1ba7962 CC	416	struct stat st;
	417	dev_t dev;
	418
	419	name = iter->d_name;
f38fd19d KZ	420	#ifdef _DIRENT_HAVE_D_TYPE
	421	if (iter->d_type != DT_UNKNOWN &&
	422	iter->d_type != DT_CHR && iter->d_type != DT_LNK)
	423	continue;
	424	#endif
c1ba7962 CC	425	if (!strcmp(name, ".") \|\| !strcmp(name, "..") \|\|
	426	!strstr(name, "ubi"))
	427	continue;
	428	if (!strcmp(name, "ubi_ctrl"))
	429	continue;
2208b3cc	430	if (fstatat(dirfd(dir), name, &st, 0))
f38fd19d KZ	431	continue;
f38fd19d KZ	432
c1ba7962	433	dev = st.st_rdev;
f38fd19d KZ	434
	435	if (!S_ISCHR(st.st_mode) \|\| !minor(dev))
	436	continue;
c62a6311	437	DBG(DEVNAME, ul_debug("UBI vol %s/%s: devno 0x%04X",
f38fd19d	438	*dirname, name, (int) dev));
49361dc4	439	probe_one(cache, name, dev, BLKID_PRI_UBI, only_if_new, 0);
c1ba7962 CC	440	}
	441	closedir(dir);
	442	}
	443	}
	444
a0948ffe KZ	445	/*
	446	* Read the device data for all available block devices in the system.
	447	*/
	448	static int probe_all(blkid_cache cache, int only_if_new)
	449	{
	450	FILE *proc;
	451	char line[1024];
87918040	452	char ptname0[128 + 1], ptname1[128 + 1], *ptname = NULL;
a0948ffe	453	char *ptnames[2];
709beed9	454	dev_t devs[2] = { 0, 0 };
969e8cbe	455	int iswhole[2] = { 0, 0 };
a0948ffe KZ	456	int ma, mi;
	457	unsigned long long sz;
	458	int lens[2] = { 0, 0 };
	459	int which = 0, last = 0;
0295be03	460	struct list_head p, pnext;
a0948ffe KZ	461
	462	ptnames[0] = ptname0;
	463	ptnames[1] = ptname1;
	464
	465	if (!cache)
	466	return -BLKID_ERR_PARAM;
	467
	468	if (cache->bic_flags & BLKID_BIC_FL_PROBED &&
87918040	469	time(NULL) - cache->bic_time < BLKID_PROBE_INTERVAL)
a0948ffe KZ	470	return 0;
	471
	472	blkid_read_cache(cache);
a0948ffe KZ	473	evms_probe_all(cache, only_if_new);
	474	#ifdef VG_DIR
	475	lvm_probe_all(cache, only_if_new);
	476	#endif
c1ba7962	477	ubi_probe_all(cache, only_if_new);
a0948ffe	478
4000fc12	479	proc = fopen(PROC_PARTITIONS, "r" UL_CLOEXECSTR);
a0948ffe KZ	480	if (!proc)
	481	return -BLKID_ERR_PROC;
	482
	483	while (fgets(line, sizeof(line), proc)) {
	484	last = which;
	485	which ^= 1;
	486	ptname = ptnames[which];
	487
	488	if (sscanf(line, " %d %d %llu %128[^\n ]",
	489	&ma, &mi, &sz, ptname) != 4)
	490	continue;
	491	devs[which] = makedev(ma, mi);
	492
969e8cbe	493	DBG(DEVNAME, ul_debug("read device name %s", ptname));
a0948ffe KZ	494
	495	/* Skip whole disk devs unless they have no partitions.
	496	* If base name of device has changed, also
	497	* check previous dev to see if it didn't have a partn.
	498	* heuristic: partition name ends in a digit, & partition
	499	* names contain whole device name as substring.
	500	*
	501	* Skip extended partitions.
	502	* heuristic: size is 1
a0948ffe KZ	503	*/
	504
	505	lens[which] = strlen(ptname);
969e8cbe	506	iswhole[which] = sysfs_devno_is_wholedisk(devs[which]);
a0948ffe	507
969e8cbe KZ	508	/* probably partition, so check */
	509	if (!iswhole[which]) {
	510	DBG(DEVNAME, ul_debug(" partition dev %s, devno 0x%04X",
a0948ffe KZ	511	ptname, (unsigned int) devs[which]));
	512
	513	if (sz > 1)
	514	probe_one(cache, ptname, devs[which], 0,
49361dc4	515	only_if_new, 0);
a0948ffe KZ	516	lens[which] = 0; /* mark as checked */
	517	}
	518
0295be03 ES	519	/*
	520	* If last was a whole disk and we just found a partition
	521	* on it, remove the whole-disk dev from the cache if
	522	* it exists.
	523	*/
969e8cbe KZ	524	if (lens[last] && iswhole[last]
	525	&& !strncmp(ptnames[last], ptname, lens[last])) {
	526
0295be03 ES	527	list_for_each_safe(p, pnext, &cache->bic_devs) {
	528	blkid_dev tmp;
	529
	530	/* find blkid dev for the whole-disk devno */
	531	tmp = list_entry(p, struct blkid_struct_dev,
	532	bid_devs);
	533	if (tmp->bid_devno == devs[last]) {
969e8cbe	534	DBG(DEVNAME, ul_debug(" freeing %s",
0295be03 ES	535	tmp->bid_name));
	536	blkid_free_dev(tmp);
	537	cache->bic_flags \|= BLKID_BIC_FL_CHANGED;
	538	break;
	539	}
	540	}
969e8cbe	541	lens[last] = 0; /* mark as checked */
0295be03	542	}
a0948ffe KZ	543	/*
	544	* If last was not checked because it looked like a whole-disk
	545	* dev, and the device's base name has changed,
	546	* check last as well.
	547	*/
	548	if (lens[last] && strncmp(ptnames[last], ptname, lens[last])) {
969e8cbe	549	DBG(DEVNAME, ul_debug(" whole dev %s, devno 0x%04X",
a0948ffe KZ	550	ptnames[last], (unsigned int) devs[last]));
a0948ffe KZ	551	probe_one(cache, ptnames[last], devs[last], 0,
49361dc4	552	only_if_new, 0);
969e8cbe KZ	553
969e8cbe KZ	554	lens[last] = 0; /* mark as checked */
a0948ffe KZ	555	}
	556	}
	557
	558	/* Handle the last device if it wasn't partitioned */
	559	if (lens[which])
49361dc4	560	probe_one(cache, ptname, devs[which], 0, only_if_new, 0);
a0948ffe KZ	561
	562	fclose(proc);
	563	blkid_flush_cache(cache);
	564	return 0;
	565	}
	566
49361dc4 KZ	567	/* Don't use it by default -- it's pretty slow (because cdroms, floppy, ...)
	568	*/
	569	static int probe_all_removable(blkid_cache cache)
	570	{
708a58b6	571	struct path_cxt *pc;
49361dc4 KZ	572	DIR *dir;
49361dc4 KZ	573	struct dirent *d;
49361dc4 KZ	574
	575	if (!cache)
	576	return -BLKID_ERR_PARAM;
	577
	578	dir = opendir(_PATH_SYS_BLOCK);
	579	if (!dir)
	580	return -BLKID_ERR_PROC;
	581
708a58b6 KZ	582	pc = ul_new_path(NULL);
708a58b6 KZ	583
49361dc4	584	while((d = readdir(dir))) {
90e9fcda	585	int removable = 0;
d8a84552	586	dev_t devno;
49361dc4 KZ	587
	588	#ifdef _DIRENT_HAVE_D_TYPE
	589	if (d->d_type != DT_UNKNOWN && d->d_type != DT_LNK)
	590	continue;
	591	#endif
	592	if (d->d_name[0] == '.' &&
	593	((d->d_name[1] == 0) \|\|
	594	((d->d_name[1] == '.') && (d->d_name[2] == 0))))
	595	continue;
	596
708a58b6	597	devno = sysfs_devname_to_devno(d->d_name);
d8a84552	598	if (!devno)
49361dc4 KZ	599	continue;
49361dc4 KZ	600
708a58b6 KZ	601	if (sysfs_blkdev_init_path(pc, devno, NULL) == 0
708a58b6 KZ	602	&& ul_path_read_s32(pc, &removable, "removable") != 0)
eb542dff	603	removable = 0;
49361dc4	604
d8a84552 KZ	605	if (removable)
d8a84552 KZ	606	probe_one(cache, d->d_name, devno, 0, 0, 1);
49361dc4 KZ	607	}
49361dc4 KZ	608
708a58b6	609	ul_unref_path(pc);
49361dc4 KZ	610	closedir(dir);
	611	return 0;
	612	}
	613
	614
488e52be KZ	615	/**
	616	* blkid_probe_all:
	617	* @cache: cache handler
	618	*
	619	* Probes all block devices.
	620	*
	621	* Returns: 0 on success, or number less than zero in case of error.
	622	*/
a0948ffe KZ	623	int blkid_probe_all(blkid_cache cache)
	624	{
	625	int ret;
	626
c62a6311	627	DBG(PROBE, ul_debug("Begin blkid_probe_all()"));
a0948ffe	628	ret = probe_all(cache, 0);
e3436956	629	if (ret == 0) {
87918040	630	cache->bic_time = time(NULL);
e3436956 KZ	631	cache->bic_flags \|= BLKID_BIC_FL_PROBED;
e3436956 KZ	632	}
c62a6311	633	DBG(PROBE, ul_debug("End blkid_probe_all() [rc=%d]", ret));
a0948ffe KZ	634	return ret;
	635	}
	636
488e52be KZ	637	/**
	638	* blkid_probe_all_new:
	639	* @cache: cache handler
	640	*
	641	* Probes all new block devices.
	642	*
	643	* Returns: 0 on success, or number less than zero in case of error.
	644	*/
a0948ffe KZ	645	int blkid_probe_all_new(blkid_cache cache)
	646	{
	647	int ret;
	648
c62a6311	649	DBG(PROBE, ul_debug("Begin blkid_probe_all_new()"));
a0948ffe	650	ret = probe_all(cache, 1);
c62a6311	651	DBG(PROBE, ul_debug("End blkid_probe_all_new() [rc=%d]", ret));
a0948ffe KZ	652	return ret;
	653	}
	654
49361dc4 KZ	655	/**
	656	* blkid_probe_all_removable:
	657	* @cache: cache handler
	658	*
	659	* The libblkid probing is based on devices from /proc/partitions by default.
	660	* This file usually does not contain removable devices (e.g. CDROMs) and this kind
	661	* of devices are invisible for libblkid.
	662	*
	663	* This function adds removable block devices to @cache (probing is based on
	664	* information from the /sys directory). Don't forget that removable devices
	665	* (floppies, CDROMs, ...) could be pretty slow. It's very bad idea to call
	666	* this function by default.
	667	*
	668	* Note that devices which were detected by this function won't be written to
	669	* blkid.tab cache file.
	670	*
	671	* Returns: 0 on success, or number less than zero in case of error.
	672	*/
	673	int blkid_probe_all_removable(blkid_cache cache)
	674	{
	675	int ret;
	676
c62a6311	677	DBG(PROBE, ul_debug("Begin blkid_probe_all_removable()"));
49361dc4	678	ret = probe_all_removable(cache);
c62a6311	679	DBG(PROBE, ul_debug("End blkid_probe_all_removable() [rc=%d]", ret));
49361dc4 KZ	680	return ret;
49361dc4 KZ	681	}
a0948ffe KZ	682
	683	#ifdef TEST_PROGRAM
	684	int main(int argc, char **argv)
	685	{
	686	blkid_cache cache = NULL;
	687	int ret;
	688
0540ea54	689	blkid_init_debug(BLKID_DEBUG_ALL);
a0948ffe KZ	690	if (argc != 1) {
	691	fprintf(stderr, "Usage: %s\n"
	692	"Probe all devices and exit\n", argv[0]);
	693	exit(1);
	694	}
	695	if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) {
	696	fprintf(stderr, "%s: error creating cache (%d)\n",
	697	argv[0], ret);
	698	exit(1);
	699	}
	700	if (blkid_probe_all(cache) < 0)
	701	printf("%s: error probing devices\n", argv[0]);
	702
49361dc4 KZ	703	if (blkid_probe_all_removable(cache) < 0)
	704	printf("%s: error probing removable devices\n", argv[0]);
	705
a0948ffe KZ	706	blkid_put_cache(cache);
	707	return (0);
	708	}
	709	#endif