old_e2fsprogs/blkid/devname.c

/* vi: set sw=4 ts=4: */
/*
 * 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>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <sys/stat.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef 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;
}

#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_for_read(lvm_device)) == 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 (LONE_CHAR(vg_name, '.') || !strcmp(vg_name, ".."))
			continue;
		vdirname = xmalloc(vg_len + strlen(vg_name) + 8);
		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 (LONE_CHAR(lv_name, '.') || !strcmp(lv_name, ".."))
				continue;

			lvm_device = xmalloc(vg_len + strlen(vg_name) +
					    strlen(lv_name) + 8);
			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);
	}
	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_for_read(PROC_EVMS_VOLUMES);
	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 = NULL;
	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(NULL) - 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_for_read(PROC_PARTITIONS);
	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(NULL);
	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, bb_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
1	niro	532	/* vi: set sw=4 ts=4: */
2			/*
3			* devname.c - get a dev by its device inode name
4			*
5			* Copyright (C) Andries Brouwer
6			* Copyright (C) 1999, 2000, 2001, 2002, 2003 Theodore Ts'o
7			* Copyright (C) 2001 Andreas Dilger
8			*
9			* %Begin-Header%
10			* This file may be redistributed under the terms of the
11			* GNU Lesser General Public License.
12			* %End-Header%
13			*/
14
15			#include <stdio.h>
16			#include <string.h>
17			#ifdef HAVE_UNISTD_H
18			#include <unistd.h>
19			#endif
20			#include <stdlib.h>
21			#include <string.h>
22			#include <ctype.h>
23			#ifdef HAVE_SYS_TYPES_H
24			#include <sys/types.h>
25			#endif
26			#include <sys/stat.h>
27			#ifdef HAVE_ERRNO_H
28			#include <errno.h>
29			#endif
30			#ifdef HAVE_SYS_MKDEV_H
31			#include <sys/mkdev.h>
32			#endif
33			#include <time.h>
34
35			#include "blkidP.h"
36
37			/*
38			* Find a dev struct in the cache by device name, if available.
39			*
40			* If there is no entry with the specified device name, and the create
41			* flag is set, then create an empty device entry.
42			*/
43			blkid_dev blkid_get_dev(blkid_cache cache, const char *devname, int flags)
44			{
45			blkid_dev dev = NULL, tmp;
46			struct list_head *p;
47
48			if (!cache \|\| !devname)
49			return NULL;
50
51			list_for_each(p, &cache->bic_devs) {
52			tmp = list_entry(p, struct blkid_struct_dev, bid_devs);
53			if (strcmp(tmp->bid_name, devname))
54			continue;
55
56			DBG(DEBUG_DEVNAME,
57			printf("found devname %s in cache\n", tmp->bid_name));
58			dev = tmp;
59			break;
60			}
61
62			if (!dev && (flags & BLKID_DEV_CREATE)) {
63			dev = blkid_new_dev();
64			if (!dev)
65			return NULL;
66			dev->bid_name = blkid_strdup(devname);
67			dev->bid_cache = cache;
68			list_add_tail(&dev->bid_devs, &cache->bic_devs);
69			cache->bic_flags \|= BLKID_BIC_FL_CHANGED;
70			}
71
72			if (flags & BLKID_DEV_VERIFY)
73			dev = blkid_verify(cache, dev);
74			return dev;
75			}
76
77			/*
78			* Probe a single block device to add to the device cache.
79			*/
80			static void probe_one(blkid_cache cache, const char *ptname,
81			dev_t devno, int pri)
82			{
83			blkid_dev dev = NULL;
84			struct list_head *p;
85			const char **dir;
86			char *devname = NULL;
87
88			/* See if we already have this device number in the cache. */
89			list_for_each(p, &cache->bic_devs) {
90			blkid_dev tmp = list_entry(p, struct blkid_struct_dev,
91			bid_devs);
92			if (tmp->bid_devno == devno) {
93			dev = blkid_verify(cache, tmp);
94			break;
95			}
96			}
97			if (dev && dev->bid_devno == devno)
98			goto set_pri;
99
100			/*
101			* Take a quick look at /dev/ptname for the device number. We check
102			* all of the likely device directories. If we don't find it, or if
103			* the stat information doesn't check out, use blkid_devno_to_devname()
104			* to find it via an exhaustive search for the device major/minor.
105			*/
106			for (dir = blkid_devdirs; *dir; dir++) {
107			struct stat st;
108			char device[256];
109
110			sprintf(device, "%s/%s", *dir, ptname);
111			if ((dev = blkid_get_dev(cache, device, BLKID_DEV_FIND)) &&
112			dev->bid_devno == devno)
113			goto set_pri;
114
115			if (stat(device, &st) == 0 && S_ISBLK(st.st_mode) &&
116			st.st_rdev == devno) {
117			devname = blkid_strdup(device);
118			break;
119			}
120			}
121			if (!devname) {
122			devname = blkid_devno_to_devname(devno);
123			if (!devname)
124			return;
125			}
126			dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
127			free(devname);
128
129			set_pri:
130			if (!pri && !strncmp(ptname, "md", 2))
131			pri = BLKID_PRI_MD;
132			if (dev)
133			dev->bid_pri = pri;
134			}
135
136			#define PROC_PARTITIONS "/proc/partitions"
137			#define VG_DIR "/proc/lvm/VGs"
138
139			/*
140			* This function initializes the UUID cache with devices from the LVM
141			* proc hierarchy. We currently depend on the names of the LVM
142			* hierarchy giving us the device structure in /dev. (XXX is this a
143			* safe thing to do?)
144			*/
145			#ifdef VG_DIR
146			#include <dirent.h>
147			static dev_t lvm_get_devno(const char *lvm_device)
148			{
149			FILE *lvf;
150			char buf[1024];
151			int ma, mi;
152			dev_t ret = 0;
153
154			DBG(DEBUG_DEVNAME, printf("opening %s\n", lvm_device));
155	niro	816	if ((lvf = fopen_for_read(lvm_device)) == NULL) {
156	niro	532	DBG(DEBUG_DEVNAME, printf("%s: (%d) %s\n", lvm_device, errno,
157			strerror(errno)));
158			return 0;
159			}
160
161			while (fgets(buf, sizeof(buf), lvf)) {
162			if (sscanf(buf, "device: %d:%d", &ma, &mi) == 2) {
163			ret = makedev(ma, mi);
164			break;
165			}
166			}
167			fclose(lvf);
168
169			return ret;
170			}
171
172			static void lvm_probe_all(blkid_cache cache)
173			{
174			DIR *vg_list;
175			struct dirent *vg_iter;
176			int vg_len = strlen(VG_DIR);
177			dev_t dev;
178
179			if ((vg_list = opendir(VG_DIR)) == NULL)
180			return;
181
182			DBG(DEBUG_DEVNAME, printf("probing LVM devices under %s\n", VG_DIR));
183
184			while ((vg_iter = readdir(vg_list)) != NULL) {
185			DIR *lv_list;
186			char *vdirname;
187			char *vg_name;
188			struct dirent *lv_iter;
189
190			vg_name = vg_iter->d_name;
191			if (LONE_CHAR(vg_name, '.') \|\| !strcmp(vg_name, ".."))
192			continue;
193			vdirname = xmalloc(vg_len + strlen(vg_name) + 8);
194			sprintf(vdirname, "%s/%s/LVs", VG_DIR, vg_name);
195
196			lv_list = opendir(vdirname);
197			free(vdirname);
198			if (lv_list == NULL)
199			continue;
200
201			while ((lv_iter = readdir(lv_list)) != NULL) {
202			char lv_name, lvm_device;
203
204			lv_name = lv_iter->d_name;
205			if (LONE_CHAR(lv_name, '.') \|\| !strcmp(lv_name, ".."))
206			continue;
207
208			lvm_device = xmalloc(vg_len + strlen(vg_name) +
209			strlen(lv_name) + 8);
210			sprintf(lvm_device, "%s/%s/LVs/%s", VG_DIR, vg_name,
211			lv_name);
212			dev = lvm_get_devno(lvm_device);
213			sprintf(lvm_device, "%s/%s", vg_name, lv_name);
214			DBG(DEBUG_DEVNAME, printf("LVM dev %s: devno 0x%04X\n",
215			lvm_device,
216			(unsigned int) dev));
217			probe_one(cache, lvm_device, dev, BLKID_PRI_LVM);
218			free(lvm_device);
219			}
220			closedir(lv_list);
221			}
222			closedir(vg_list);
223			}
224			#endif
225
226			#define PROC_EVMS_VOLUMES "/proc/evms/volumes"
227
228			static int
229			evms_probe_all(blkid_cache cache)
230			{
231			char line[100];
232			int ma, mi, sz, num = 0;
233			FILE *procpt;
234			char device[110];
235
236	niro	816	procpt = fopen_for_read(PROC_EVMS_VOLUMES);
237	niro	532	if (!procpt)
238			return 0;
239			while (fgets(line, sizeof(line), procpt)) {
240	niro	816	if (sscanf(line, " %d %d %d %s %s %[^\n ]",
241	niro	532	&ma, &mi, &sz, device) != 4)
242			continue;
243
244			DBG(DEBUG_DEVNAME, printf("Checking partition %s (%d, %d)\n",
245			device, ma, mi));
246
247			probe_one(cache, device, makedev(ma, mi), BLKID_PRI_EVMS);
248			num++;
249			}
250			fclose(procpt);
251			return num;
252			}
253
254			/*
255			* Read the device data for all available block devices in the system.
256			*/
257			int blkid_probe_all(blkid_cache cache)
258			{
259			FILE *proc;
260			char line[1024];
261	niro	1123	char ptname0[128], ptname1[128], *ptname = NULL;
262	niro	532	char *ptnames[2];
263			dev_t devs[2];
264			int ma, mi;
265			unsigned long long sz;
266			int lens[2] = { 0, 0 };
267			int which = 0, last = 0;
268
269			ptnames[0] = ptname0;
270			ptnames[1] = ptname1;
271
272			if (!cache)
273			return -BLKID_ERR_PARAM;
274
275			if (cache->bic_flags & BLKID_BIC_FL_PROBED &&
276	niro	984	time(NULL) - cache->bic_time < BLKID_PROBE_INTERVAL)
277	niro	532	return 0;
278
279			blkid_read_cache(cache);
280			evms_probe_all(cache);
281			#ifdef VG_DIR
282			lvm_probe_all(cache);
283			#endif
284
285	niro	816	proc = fopen_for_read(PROC_PARTITIONS);
286	niro	532	if (!proc)
287			return -BLKID_ERR_PROC;
288
289			while (fgets(line, sizeof(line), proc)) {
290			last = which;
291			which ^= 1;
292			ptname = ptnames[which];
293
294			if (sscanf(line, " %d %d %llu %128[^\n ]",
295			&ma, &mi, &sz, ptname) != 4)
296			continue;
297			devs[which] = makedev(ma, mi);
298
299			DBG(DEBUG_DEVNAME, printf("read partition name %s\n", ptname));
300
301			/* Skip whole disk devs unless they have no partitions
302			* If we don't have a partition on this dev, also
303			* check previous dev to see if it didn't have a partn.
304			* heuristic: partition name ends in a digit.
305			*
306			* Skip extended partitions.
307			* heuristic: size is 1
308			*
309			* FIXME: skip /dev/{ida,cciss,rd} whole-disk devs
310			*/
311
312			lens[which] = strlen(ptname);
313			if (isdigit(ptname[lens[which] - 1])) {
314			DBG(DEBUG_DEVNAME,
315			printf("partition dev %s, devno 0x%04X\n",
316			ptname, (unsigned int) devs[which]));
317
318			if (sz > 1)
319			probe_one(cache, ptname, devs[which], 0);
320			lens[which] = 0;
321			lens[last] = 0;
322			} else if (lens[last] && strncmp(ptnames[last], ptname,
323			lens[last])) {
324			DBG(DEBUG_DEVNAME,
325			printf("whole dev %s, devno 0x%04X\n",
326			ptnames[last], (unsigned int) devs[last]));
327			probe_one(cache, ptnames[last], devs[last], 0);
328			lens[last] = 0;
329			}
330			}
331
332			/* Handle the last device if it wasn't partitioned */
333			if (lens[which])
334			probe_one(cache, ptname, devs[which], 0);
335
336			fclose(proc);
337
338	niro	984	cache->bic_time = time(NULL);
339	niro	532	cache->bic_flags \|= BLKID_BIC_FL_PROBED;
340			blkid_flush_cache(cache);
341			return 0;
342			}
343
344			#ifdef TEST_PROGRAM
345			int main(int argc, char **argv)
346			{
347			blkid_cache cache = NULL;
348			int ret;
349
350			blkid_debug_mask = DEBUG_ALL;
351			if (argc != 1) {
352			fprintf(stderr, "Usage: %s\n"
353			"Probe all devices and exit\n", argv[0]);
354			exit(1);
355			}
356			if ((ret = blkid_get_cache(&cache, bb_dev_null)) != 0) {
357			fprintf(stderr, "%s: error creating cache (%d)\n",
358			argv[0], ret);
359			exit(1);
360			}
361			if (blkid_probe_all(cache) < 0)
362			printf("%s: error probing devices\n", argv[0]);
363
364			blkid_put_cache(cache);
365			return 0;
366			}
367			#endif