e2fsprogs/blkid/devname.c - codeaurora/busybox - Gitiles

 /*
  * 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%
  */

 #include <stdio.h>
 #include <string.h>
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>
 #if HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
 #if HAVE_SYS_STAT_H
 #include <sys/stat.h>
 #endif
 #if HAVE_ERRNO_H
 #include <errno.h>
 #endif
 #if HAVE_SYS_MKDEV_H
 #include <sys/mkdev.h>
 #endif
 #include <time.h>

 #include "blkidP.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;

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

 	list_for_each(p, &cache->bic_devs) {
 		tmp = list_entry(p, struct blkid_struct_dev, bid_devs);
 		if (strcmp(tmp->bid_name, devname))
 			continue;

 		DBG(DEBUG_DEVNAME,
 		    printf("found devname %s in cache\n", tmp->bid_name));
 		dev = tmp;
 		break;
 	}

 	if (!dev && (flags & BLKID_DEV_CREATE)) {
 		dev = blkid_new_dev();
 		if (!dev)
 			return NULL;
 		dev->bid_name = blkid_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);
 	return dev;
 }

 /*
  * 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)
 {
 	blkid_dev dev = NULL;
 	struct list_head *p;
 	const char **dir;
 	char *devname = NULL;

 	/* See if we already have this device number in the cache. */
 	list_for_each(p, &cache->bic_devs) {
 		blkid_dev tmp = list_entry(p, struct blkid_struct_dev,
 					   bid_devs);
 		if (tmp->bid_devno == devno) {
 			dev = blkid_verify(cache, tmp);
 			break;
 		}
 	}
 	if (dev && dev->bid_devno == devno)
 		goto set_pri;

 	/*
 	 * 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 = blkid_devdirs; *dir; dir++) {
 		struct stat st;
 		char device[256];

 		sprintf(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) &&
 		    st.st_rdev == devno) {
 			devname = blkid_strdup(device);
 			break;
 		}
 	}
 	if (!devname) {
 		devname = blkid_devno_to_devname(devno);
 		if (!devname)
 			return;
 	}
 	dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
 	free(devname);

 set_pri:
 	if (!pri && !strncmp(ptname, "md", 2))
 		pri = BLKID_PRI_MD;
 	if (dev)
 		dev->bid_pri = pri;
 	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
 #include <dirent.h>
 static dev_t lvm_get_devno(const char *lvm_device)
 {
 	FILE *lvf;
 	char buf[1024];
 	int ma, mi;
 	dev_t ret = 0;

 	DBG(DEBUG_DEVNAME, printf("opening %s\n", lvm_device));
 	if ((lvf = fopen(lvm_device, "r")) == NULL) {
 		DBG(DEBUG_DEVNAME, printf("%s: (%d) %s\n", lvm_device, errno,
 					  strerror(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)
 {
 	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(DEBUG_DEVNAME, printf("probing LVM devices under %s\n", 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(DEBUG_DEVNAME, printf("LVM dev %s: devno 0x%04X\n",
 						  lvm_device,
 						  (unsigned int) dev));
 			probe_one(cache, lvm_device, dev, BLKID_PRI_LVM);
 			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)
 {
 	char line[100];
 	int ma, mi, sz, num = 0;
 	FILE *procpt;
 	char device[110];

 	procpt = fopen(PROC_EVMS_VOLUMES, "r");
 	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(DEBUG_DEVNAME, printf("Checking partition %s (%d, %d)\n",
 					  device, ma, mi));

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

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

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

 	if (!cache)
 		return -BLKID_ERR_PARAM;

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

 	blkid_read_cache(cache);
 	evms_probe_all(cache);
 #ifdef VG_DIR
 	lvm_probe_all(cache);
 #endif

 	proc = fopen(PROC_PARTITIONS, "r");
 	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(DEBUG_DEVNAME, printf("read partition name %s\n", ptname));

 		/* Skip whole disk devs unless they have no partitions
 		 * If we don't have a partition on this dev, also
 		 * check previous dev to see if it didn't have a partn.
 		 * heuristic: partition name ends in a digit.
 		 *
 		 * Skip extended partitions.
 		 * heuristic: size is 1
 		 *
 		 * FIXME: skip /dev/{ida,cciss,rd} whole-disk devs
 		 */

 		lens[which] = strlen(ptname);
 		if (isdigit(ptname[lens[which] - 1])) {
 			DBG(DEBUG_DEVNAME,
 			    printf("partition dev %s, devno 0x%04X\n",
 				   ptname, (unsigned int) devs[which]));

 			if (sz > 1)
 				probe_one(cache, ptname, devs[which], 0);
 			lens[which] = 0;
 			lens[last] = 0;
 		} else if (lens[last] && strncmp(ptnames[last], ptname,
 						 lens[last])) {
 			DBG(DEBUG_DEVNAME,
 			    printf("whole dev %s, devno 0x%04X\n",
 				   ptnames[last], (unsigned int) devs[last]));
 			probe_one(cache, ptnames[last], devs[last], 0);
 			lens[last] = 0;
 		}
 	}

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

 	fclose(proc);

 	cache->bic_time = time(0);
 	cache->bic_flags |= BLKID_BIC_FL_PROBED;
 	blkid_flush_cache(cache);
 	return 0;
 }

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

 	blkid_debug_mask = 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]);

 	blkid_put_cache(cache);
 	return (0);
 }
 #endif
	/*
	* 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%
	*/

	#include <stdio.h>
	#include <string.h>
	#if HAVE_UNISTD_H
	#include <unistd.h>
	#endif
	#include <stdlib.h>
	#include <string.h>
	#include <ctype.h>
	#if HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif
	#if HAVE_SYS_STAT_H
	#include <sys/stat.h>
	#endif
	#if HAVE_ERRNO_H
	#include <errno.h>
	#endif
	#if HAVE_SYS_MKDEV_H
	#include <sys/mkdev.h>
	#endif
	#include <time.h>

	#include "blkidP.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;

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

	list_for_each(p, &cache->bic_devs) {
	tmp = list_entry(p, struct blkid_struct_dev, bid_devs);
	if (strcmp(tmp->bid_name, devname))
	continue;

	DBG(DEBUG_DEVNAME,
	printf("found devname %s in cache\n", tmp->bid_name));
	dev = tmp;
	break;
	}

	if (!dev && (flags & BLKID_DEV_CREATE)) {
	dev = blkid_new_dev();
	if (!dev)
	return NULL;
	dev->bid_name = blkid_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);
	return dev;
	}

	/*
	* 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)
	{
	blkid_dev dev = NULL;
	struct list_head *p;
	const char **dir;
	char *devname = NULL;

	/* See if we already have this device number in the cache. */
	list_for_each(p, &cache->bic_devs) {
	blkid_dev tmp = list_entry(p, struct blkid_struct_dev,
	bid_devs);
	if (tmp->bid_devno == devno) {
	dev = blkid_verify(cache, tmp);
	break;
	}
	}
	if (dev && dev->bid_devno == devno)
	goto set_pri;

	/*
	* 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 = blkid_devdirs; *dir; dir++) {
	struct stat st;
	char device[256];

	sprintf(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) &&
	st.st_rdev == devno) {
	devname = blkid_strdup(device);
	break;
	}
	}
	if (!devname) {
	devname = blkid_devno_to_devname(devno);
	if (!devname)
	return;
	}
	dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
	free(devname);

	set_pri:
	if (!pri && !strncmp(ptname, "md", 2))
	pri = BLKID_PRI_MD;
	if (dev)
	dev->bid_pri = pri;
	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
	#include <dirent.h>
	static dev_t lvm_get_devno(const char *lvm_device)
	{
	FILE *lvf;
	char buf[1024];
	int ma, mi;
	dev_t ret = 0;

	DBG(DEBUG_DEVNAME, printf("opening %s\n", lvm_device));
	if ((lvf = fopen(lvm_device, "r")) == NULL) {
	DBG(DEBUG_DEVNAME, printf("%s: (%d) %s\n", lvm_device, errno,
	strerror(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)
	{
	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(DEBUG_DEVNAME, printf("probing LVM devices under %s\n", 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(DEBUG_DEVNAME, printf("LVM dev %s: devno 0x%04X\n",
	lvm_device,
	(unsigned int) dev));
	probe_one(cache, lvm_device, dev, BLKID_PRI_LVM);
	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)
	{
	char line[100];
	int ma, mi, sz, num = 0;
	FILE *procpt;
	char device[110];

	procpt = fopen(PROC_EVMS_VOLUMES, "r");
	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(DEBUG_DEVNAME, printf("Checking partition %s (%d, %d)\n",
	device, ma, mi));

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

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

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

	if (!cache)
	return -BLKID_ERR_PARAM;

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

	blkid_read_cache(cache);
	evms_probe_all(cache);
	#ifdef VG_DIR
	lvm_probe_all(cache);
	#endif

	proc = fopen(PROC_PARTITIONS, "r");
	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(DEBUG_DEVNAME, printf("read partition name %s\n", ptname));

	/* Skip whole disk devs unless they have no partitions
	* If we don't have a partition on this dev, also
	* check previous dev to see if it didn't have a partn.
	* heuristic: partition name ends in a digit.
	*
	* Skip extended partitions.
	* heuristic: size is 1
	*
	* FIXME: skip /dev/{ida,cciss,rd} whole-disk devs
	*/

	lens[which] = strlen(ptname);
	if (isdigit(ptname[lens[which] - 1])) {
	DBG(DEBUG_DEVNAME,
	printf("partition dev %s, devno 0x%04X\n",
	ptname, (unsigned int) devs[which]));

	if (sz > 1)
	probe_one(cache, ptname, devs[which], 0);
	lens[which] = 0;
	lens[last] = 0;
	} else if (lens[last] && strncmp(ptnames[last], ptname,
	lens[last])) {
	DBG(DEBUG_DEVNAME,
	printf("whole dev %s, devno 0x%04X\n",
	ptnames[last], (unsigned int) devs[last]));
	probe_one(cache, ptnames[last], devs[last], 0);
	lens[last] = 0;
	}
	}

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

	fclose(proc);

	cache->bic_time = time(0);
	cache->bic_flags \|= BLKID_BIC_FL_PROBED;
	blkid_flush_cache(cache);
	return 0;
	}

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

	blkid_debug_mask = 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]);

	blkid_put_cache(cache);
	return (0);
	}
	#endif