[mirror_lxc.git] / src / lxc / bdev / lxclvm.c

/*
 * lxc: linux Container library
 *
 * (C) Copyright IBM Corp. 2007, 2008
 *
 * Authors:
 * Daniel Lezcano <daniel.lezcano at free.fr>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#define _GNU_SOURCE
#define __STDC_FORMAT_MACROS /* Required for PRIu64 to work. */
#include <inttypes.h> /* Required for PRIu64 to work. */
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/sysmacros.h>
#include <sys/wait.h>

#include "bdev.h"
#include "config.h"
#include "log.h"
#include "lxclvm.h"
#include "storage_utils.h"
#include "utils.h"

/* major()/minor() */
#ifdef MAJOR_IN_MKDEV
#    include <sys/mkdev.h>
#endif

lxc_log_define(lxclvm, lxc);

extern char *dir_new_path(char *src, const char *oldname, const char *name,
		const char *oldpath, const char *lxcpath);

    /*
     * LVM ops
     */

    /*
     * path must be '/dev/$vg/$lv', $vg must be an existing VG, and $lv must not
     * yet exist.  This function will attempt to create /dev/$vg/$lv of size
     * $size. If thinpool is specified, we'll check for it's existence and if
     * it's
     * a valid thin pool, and if so, we'll create the requested lv from that
     * thin
     * pool.
     */
    static int do_lvm_create(const char *path, uint64_t size,
			     const char *thinpool)
{
	int ret, pid, len;
	char sz[24], *pathdup, *vg, *lv, *tp = NULL;

	if ((pid = fork()) < 0) {
		SYSERROR("failed fork");
		return -1;
	}
	if (pid > 0)
		return wait_for_pid(pid);

	// specify bytes to lvcreate
	ret = snprintf(sz, 24, "%"PRIu64"b", size);
	if (ret < 0 || ret >= 24)
		exit(EXIT_FAILURE);

	pathdup = strdup(path);
	if (!pathdup)
		exit(EXIT_FAILURE);

	lv = strrchr(pathdup, '/');
	if (!lv)
		exit(EXIT_FAILURE);

	*lv = '\0';
	lv++;

	vg = strrchr(pathdup, '/');
	if (!vg)
		exit(EXIT_FAILURE);
	vg++;

	if (thinpool) {
		len = strlen(pathdup) + strlen(thinpool) + 2;
		tp = alloca(len);

		ret = snprintf(tp, len, "%s/%s", pathdup, thinpool);
		if (ret < 0 || ret >= len)
			exit(EXIT_FAILURE);

		ret = lvm_is_thin_pool(tp);
		INFO("got %d for thin pool at path: %s", ret, tp);
		if (ret < 0)
			exit(EXIT_FAILURE);

		if (!ret)
			tp = NULL;
	}

	(void)setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
	if (!tp)
	    execlp("lvcreate", "lvcreate", "-L", sz, vg, "-n", lv, (char *)NULL);
	else
	    execlp("lvcreate", "lvcreate", "--thinpool", tp, "-V", sz, vg, "-n", lv, (char *)NULL);

	SYSERROR("execlp");
	exit(EXIT_FAILURE);
}


/*
 * Look at /sys/dev/block/maj:min/dm/uuid.  If it contains the hardcoded LVM
 * prefix "LVM-", then this is an lvm2 LV
 */
int lvm_detect(const char *path)
{
	char devp[MAXPATHLEN], buf[4];
	FILE *fout;
	int ret;
	struct stat statbuf;

	if (!strncmp(path, "lvm:", 4))
		return 1;

	ret = stat(path, &statbuf);
	if (ret != 0)
		return 0;
	if (!S_ISBLK(statbuf.st_mode))
		return 0;

	ret = snprintf(devp, MAXPATHLEN, "/sys/dev/block/%d:%d/dm/uuid",
			major(statbuf.st_rdev), minor(statbuf.st_rdev));
	if (ret < 0 || ret >= MAXPATHLEN) {
		ERROR("lvm uuid pathname too long");
		return 0;
	}
	fout = fopen(devp, "r");
	if (!fout)
		return 0;
	ret = fread(buf, 1, 4, fout);
	fclose(fout);
	if (ret != 4 || strncmp(buf, "LVM-", 4) != 0)
		return 0;
	return 1;
}

int lvm_mount(struct bdev *bdev)
{
	if (strcmp(bdev->type, "lvm"))
		return -22;
	if (!bdev->src || !bdev->dest)
		return -22;
	/* if we might pass in data sometime, then we'll have to enrich
	 * mount_unknown_fs */
	return mount_unknown_fs(bdev->src, bdev->dest, bdev->mntopts);
}

int lvm_umount(struct bdev *bdev)
{
	if (strcmp(bdev->type, "lvm"))
		return -22;
	if (!bdev->src || !bdev->dest)
		return -22;
	return umount(bdev->dest);
}

int lvm_compare_lv_attr(const char *path, int pos, const char expected)
{
	struct lxc_popen_FILE *f;
	int ret, len, status, start=0;
	char *cmd, output[12];
	const char *lvscmd = "lvs --unbuffered --noheadings -o lv_attr %s 2>/dev/null";

	len = strlen(lvscmd) + strlen(path) - 1;
	cmd = alloca(len);

	ret = snprintf(cmd, len, lvscmd, path);
	if (ret < 0 || ret >= len)
		return -1;

	f = lxc_popen(cmd);

	if (f == NULL) {
		SYSERROR("popen failed");
		return -1;
	}

	ret = fgets(output, 12, f->f) == NULL;

	status = lxc_pclose(f);

	if (ret || WEXITSTATUS(status))
		// Assume either vg or lvs do not exist, default
		// comparison to false.
		return 0;

	len = strlen(output);
	while(start < len && output[start] == ' ') start++;

	if (start + pos < len && output[start + pos] == expected)
		return 1;

	return 0;
}

int lvm_is_thin_volume(const char *path)
{
	return lvm_compare_lv_attr(path, 6, 't');
}

int lvm_is_thin_pool(const char *path)
{
	return lvm_compare_lv_attr(path, 0, 't');
}

int lvm_snapshot(const char *orig, const char *path, uint64_t size)
{
	int ret, pid;
	char sz[24], *pathdup, *lv;

	if ((pid = fork()) < 0) {
		SYSERROR("failed fork");
		return -1;
	}
	if (pid > 0)
		return wait_for_pid(pid);

	// specify bytes to lvcreate
	ret = snprintf(sz, 24, "%"PRIu64"b", size);
	if (ret < 0 || ret >= 24)
		exit(EXIT_FAILURE);

	pathdup = strdup(path);
	if (!pathdup)
		exit(EXIT_FAILURE);
	lv = strrchr(pathdup, '/');
	if (!lv) {
		free(pathdup);
		exit(EXIT_FAILURE);
	}
	*lv = '\0';
	lv++;

	// check if the original lv is backed by a thin pool, in which case we
	// cannot specify a size that's different from the original size.
	ret = lvm_is_thin_volume(orig);
	if (ret == -1) {
		free(pathdup);
		return -1;
	}

	(void)setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
	if (!ret) {
		ret = execlp("lvcreate", "lvcreate", "-s", "-L", sz, "-n", lv, orig, (char *)NULL);
	} else {
		ret = execlp("lvcreate", "lvcreate", "-s", "-n", lv, orig, (char *)NULL);
	}

	free(pathdup);
	exit(EXIT_FAILURE);
}

int lvm_clonepaths(struct bdev *orig, struct bdev *new, const char *oldname,
		const char *cname, const char *oldpath, const char *lxcpath, int snap,
		uint64_t newsize, struct lxc_conf *conf)
{
	char fstype[100];
	uint64_t size = newsize;
	int len, ret;
	const char *cmd_args[2];
	char cmd_output[MAXPATHLEN];

	if (!orig->src || !orig->dest)
		return -1;

	if (strcmp(orig->type, "lvm")) {
		const char *vg;

		if (snap) {
			ERROR("LVM snapshot from %s backing store is not supported",
				orig->type);
			return -1;
		}
		vg = lxc_global_config_value("lxc.bdev.lvm.vg");
		len = strlen("/dev/") + strlen(vg) + strlen(cname) + 2;
		if ((new->src = malloc(len)) == NULL)
			return -1;
		ret = snprintf(new->src, len, "/dev/%s/%s", vg, cname);
		if (ret < 0 || ret >= len)
			return -1;
	} else {
		new->src = dir_new_path(orig->src, oldname, cname, oldpath, lxcpath);
		if (!new->src)
			return -1;
	}

	if (orig->mntopts) {
		new->mntopts = strdup(orig->mntopts);
		if (!new->mntopts)
			return -1;
	}

	len = strlen(lxcpath) + strlen(cname) + strlen("rootfs") + 3;
	new->dest = malloc(len);
	if (!new->dest)
		return -1;
	ret = snprintf(new->dest, len, "%s/%s/rootfs", lxcpath, cname);
	if (ret < 0 || ret >= len)
		return -1;
	if (mkdir_p(new->dest, 0755) < 0)
		return -1;

	if (is_blktype(orig)) {
		if (!newsize && blk_getsize(orig, &size) < 0) {
			ERROR("Error getting size of %s", orig->src);
			return -1;
		}
		if (detect_fs(orig, fstype, 100) < 0) {
			INFO("could not find fstype for %s, using ext3", orig->src);
			return -1;
		}
	} else {
		sprintf(fstype, "ext3");
		if (!newsize)
			size = DEFAULT_FS_SIZE;
	}

	if (snap) {
		if (lvm_snapshot(orig->src, new->src, size) < 0) {
			ERROR("could not create %s snapshot of %s", new->src, orig->src);
			return -1;
		}
	} else {
		if (do_lvm_create(new->src, size, lxc_global_config_value("lxc.bdev.lvm.thin_pool")) < 0) {
			ERROR("Error creating new lvm blockdev");
			return -1;
		}

		cmd_args[0] = fstype;
		cmd_args[1] = new->src;
		// create an fs in the loopback file
		ret = run_command(cmd_output, sizeof(cmd_output),
				  do_mkfs_exec_wrapper, (void *)cmd_args);
		if (ret < 0)
			return -1;
	}

	return 0;
}

int lvm_destroy(struct bdev *orig)
{
	pid_t pid;

	if ((pid = fork()) < 0)
		return -1;
	if (!pid) {
		(void)setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
		execlp("lvremove", "lvremove", "-f", orig->src, (char *)NULL);
		exit(EXIT_FAILURE);
	}
	return wait_for_pid(pid);
}

int lvm_create(struct bdev *bdev, const char *dest, const char *n,
		struct bdev_specs *specs)
{
	const char *vg, *thinpool, *fstype, *lv = n;
	uint64_t sz;
	int ret, len;
	const char *cmd_args[2];
	char cmd_output[MAXPATHLEN];

	if (!specs)
		return -1;

	vg = specs->lvm.vg;
	if (!vg)
		vg = lxc_global_config_value("lxc.bdev.lvm.vg");

	thinpool = specs->lvm.thinpool;
	if (!thinpool)
		thinpool = lxc_global_config_value("lxc.bdev.lvm.thin_pool");

	/* /dev/$vg/$lv */
	if (specs->lvm.lv)
		lv = specs->lvm.lv;

	len = strlen(vg) + strlen(lv) + 7;
	bdev->src = malloc(len);
	if (!bdev->src)
		return -1;

	ret = snprintf(bdev->src, len, "/dev/%s/%s", vg, lv);
	if (ret < 0 || ret >= len)
		return -1;

	// fssize is in bytes.
	sz = specs->fssize;
	if (!sz)
		sz = DEFAULT_FS_SIZE;

	if (do_lvm_create(bdev->src, sz, thinpool) < 0) {
		ERROR("Error creating new lvm blockdev %s size %"PRIu64" bytes", bdev->src, sz);
		return -1;
	}

	fstype = specs->fstype;
	if (!fstype)
		fstype = DEFAULT_FSTYPE;

	cmd_args[0] = fstype;
	cmd_args[1] = bdev->src;
	ret = run_command(cmd_output, sizeof(cmd_output), do_mkfs_exec_wrapper,
			  (void *)cmd_args);
	if (ret < 0)
		return -1;

	if (!(bdev->dest = strdup(dest)))
		return -1;

	if (mkdir_p(bdev->dest, 0755) < 0) {
		ERROR("Error creating %s", bdev->dest);
		return -1;
	}

	return 0;
}
Commit	Line	Data
2b9cbd53 CB	1	/*
	2	* lxc: linux Container library
	3	*
	4	* (C) Copyright IBM Corp. 2007, 2008
	5	*
	6	* Authors:
	7	* Daniel Lezcano <daniel.lezcano at free.fr>
	8	*
	9	* This library is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU Lesser General Public
	11	* License as published by the Free Software Foundation; either
	12	* version 2.1 of the License, or (at your option) any later version.
	13	*
	14	* This library is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* Lesser General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU Lesser General Public
	20	* License along with this library; if not, write to the Free Software
	21	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	22	*/
	23
	24	#define _GNU_SOURCE
	25	#define __STDC_FORMAT_MACROS /* Required for PRIu64 to work. */
	26	#include <inttypes.h> /* Required for PRIu64 to work. */
	27	#include <stdint.h>
	28	#include <stdio.h>
	29	#include <stdlib.h>
	30	#include <string.h>
	31	#include <unistd.h>
ce831b3b	32	#include <sys/sysmacros.h>
23c9c64d	33	#include <sys/wait.h>
2b9cbd53 CB	34
2b9cbd53 CB	35	#include "bdev.h"
af6824fc	36	#include "config.h"
2b9cbd53 CB	37	#include "log.h"
2b9cbd53 CB	38	#include "lxclvm.h"
f2d5a09d	39	#include "storage_utils.h"
2b9cbd53 CB	40	#include "utils.h"
2b9cbd53 CB	41
af6824fc ST	42	/* major()/minor() */
	43	#ifdef MAJOR_IN_MKDEV
	44	# include <sys/mkdev.h>
	45	#endif
af6824fc	46
2b9cbd53 CB	47	lxc_log_define(lxclvm, lxc);
	48
	49	extern char dir_new_path(char src, const char oldname, const char name,
	50	const char oldpath, const char lxcpath);
	51
	52	/*
	53	* LVM ops
	54	*/
	55
	56	/*
	57	* path must be '/dev/$vg/$lv', $vg must be an existing VG, and $lv must not
	58	* yet exist. This function will attempt to create /dev/$vg/$lv of size
	59	* $size. If thinpool is specified, we'll check for it's existence and if
	60	* it's
	61	* a valid thin pool, and if so, we'll create the requested lv from that
	62	* thin
	63	* pool.
	64	*/
	65	static int do_lvm_create(const char *path, uint64_t size,
	66	const char *thinpool)
	67	{
	68	int ret, pid, len;
	69	char sz[24], pathdup, vg, lv, tp = NULL;
	70
	71	if ((pid = fork()) < 0) {
	72	SYSERROR("failed fork");
	73	return -1;
	74	}
	75	if (pid > 0)
	76	return wait_for_pid(pid);
	77
	78	// specify bytes to lvcreate
	79	ret = snprintf(sz, 24, "%"PRIu64"b", size);
	80	if (ret < 0 \|\| ret >= 24)
	81	exit(EXIT_FAILURE);
	82
	83	pathdup = strdup(path);
	84	if (!pathdup)
	85	exit(EXIT_FAILURE);
	86
	87	lv = strrchr(pathdup, '/');
	88	if (!lv)
	89	exit(EXIT_FAILURE);
	90
	91	*lv = '\0';
	92	lv++;
	93
	94	vg = strrchr(pathdup, '/');
	95	if (!vg)
	96	exit(EXIT_FAILURE);
	97	vg++;
	98
	99	if (thinpool) {
	100	len = strlen(pathdup) + strlen(thinpool) + 2;
	101	tp = alloca(len);
	102
	103	ret = snprintf(tp, len, "%s/%s", pathdup, thinpool);
	104	if (ret < 0 \|\| ret >= len)
	105	exit(EXIT_FAILURE);
	106
	107	ret = lvm_is_thin_pool(tp);
	108	INFO("got %d for thin pool at path: %s", ret, tp);
	109	if (ret < 0)
	110	exit(EXIT_FAILURE);
111
112	if (!ret)
113	tp = NULL;
114	}
115
79816ab3	116	(void)setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
2b9cbd53 CB	117	if (!tp)
	118	execlp("lvcreate", "lvcreate", "-L", sz, vg, "-n", lv, (char *)NULL);
	119	else
	120	execlp("lvcreate", "lvcreate", "--thinpool", tp, "-V", sz, vg, "-n", lv, (char *)NULL);
	121
	122	SYSERROR("execlp");
	123	exit(EXIT_FAILURE);
	124	}
	125
	126
	127	/*
	128	* Look at /sys/dev/block/maj:min/dm/uuid. If it contains the hardcoded LVM
	129	* prefix "LVM-", then this is an lvm2 LV
	130	*/
	131	int lvm_detect(const char *path)
	132	{
	133	char devp[MAXPATHLEN], buf[4];
	134	FILE *fout;
	135	int ret;
	136	struct stat statbuf;
	137
f7ac4459 CB	138	if (!strncmp(path, "lvm:", 4))
f7ac4459 CB	139	return 1;
2b9cbd53 CB	140
	141	ret = stat(path, &statbuf);
	142	if (ret != 0)
	143	return 0;
	144	if (!S_ISBLK(statbuf.st_mode))
	145	return 0;
	146
	147	ret = snprintf(devp, MAXPATHLEN, "/sys/dev/block/%d:%d/dm/uuid",
	148	major(statbuf.st_rdev), minor(statbuf.st_rdev));
	149	if (ret < 0 \|\| ret >= MAXPATHLEN) {
	150	ERROR("lvm uuid pathname too long");
	151	return 0;
	152	}
	153	fout = fopen(devp, "r");
	154	if (!fout)
	155	return 0;
	156	ret = fread(buf, 1, 4, fout);
	157	fclose(fout);
	158	if (ret != 4 \|\| strncmp(buf, "LVM-", 4) != 0)
	159	return 0;
	160	return 1;
	161	}
	162
	163	int lvm_mount(struct bdev *bdev)
	164	{
	165	if (strcmp(bdev->type, "lvm"))
	166	return -22;
	167	if (!bdev->src \|\| !bdev->dest)
	168	return -22;
	169	/* if we might pass in data sometime, then we'll have to enrich
	170	* mount_unknown_fs */
	171	return mount_unknown_fs(bdev->src, bdev->dest, bdev->mntopts);
	172	}
	173
	174	int lvm_umount(struct bdev *bdev)
	175	{
	176	if (strcmp(bdev->type, "lvm"))
	177	return -22;
	178	if (!bdev->src \|\| !bdev->dest)
	179	return -22;
	180	return umount(bdev->dest);
	181	}
	182
	183	int lvm_compare_lv_attr(const char *path, int pos, const char expected)
	184	{
	185	struct lxc_popen_FILE *f;
	186	int ret, len, status, start=0;
	187	char *cmd, output[12];
	188	const char *lvscmd = "lvs --unbuffered --noheadings -o lv_attr %s 2>/dev/null";
	189
	190	len = strlen(lvscmd) + strlen(path) - 1;
	191	cmd = alloca(len);
	192
	193	ret = snprintf(cmd, len, lvscmd, path);
	194	if (ret < 0 \|\| ret >= len)
	195	return -1;
	196
	197	f = lxc_popen(cmd);
	198
	199	if (f == NULL) {
	200	SYSERROR("popen failed");
	201	return -1;
	202	}
	203
204	ret = fgets(output, 12, f->f) == NULL;
205
206	status = lxc_pclose(f);
207
208	if (ret \|\| WEXITSTATUS(status))
209	// Assume either vg or lvs do not exist, default
210	// comparison to false.
211	return 0;
212
213	len = strlen(output);
214	while(start < len && output[start] == ' ') start++;
215
216	if (start + pos < len && output[start + pos] == expected)
217	return 1;
218
219	return 0;
220	}
221
222	int lvm_is_thin_volume(const char *path)
223	{
224	return lvm_compare_lv_attr(path, 6, 't');
225	}
226
227	int lvm_is_thin_pool(const char *path)
228	{
229	return lvm_compare_lv_attr(path, 0, 't');
230	}
231
232	int lvm_snapshot(const char orig, const char path, uint64_t size)
233	{
234	int ret, pid;
235	char sz[24], pathdup, lv;
236
237	if ((pid = fork()) < 0) {
238	SYSERROR("failed fork");
239	return -1;
240	}
241	if (pid > 0)
242	return wait_for_pid(pid);
243
244	// specify bytes to lvcreate
245	ret = snprintf(sz, 24, "%"PRIu64"b", size);
246	if (ret < 0 \|\| ret >= 24)
247	exit(EXIT_FAILURE);
248
249	pathdup = strdup(path);
250	if (!pathdup)
251	exit(EXIT_FAILURE);
252	lv = strrchr(pathdup, '/');
253	if (!lv) {
254	free(pathdup);
255	exit(EXIT_FAILURE);
256	}
257	*lv = '\0';
258	lv++;
259
260	// check if the original lv is backed by a thin pool, in which case we
261	// cannot specify a size that's different from the original size.
262	ret = lvm_is_thin_volume(orig);
263	if (ret == -1) {
264	free(pathdup);
265	return -1;
266	}
267
79816ab3	268	(void)setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
2b9cbd53 CB	269	if (!ret) {
	270	ret = execlp("lvcreate", "lvcreate", "-s", "-L", sz, "-n", lv, orig, (char *)NULL);
	271	} else {
	272	ret = execlp("lvcreate", "lvcreate", "-s", "-n", lv, orig, (char *)NULL);
	273	}
	274
	275	free(pathdup);
	276	exit(EXIT_FAILURE);
	277	}
	278
	279	int lvm_clonepaths(struct bdev orig, struct bdev new, const char *oldname,
	280	const char cname, const char oldpath, const char *lxcpath, int snap,
	281	uint64_t newsize, struct lxc_conf *conf)
	282	{
	283	char fstype[100];
	284	uint64_t size = newsize;
	285	int len, ret;
a5b18cb1 CB	286	const char *cmd_args[2];
a5b18cb1 CB	287	char cmd_output[MAXPATHLEN];
2b9cbd53 CB	288
	289	if (!orig->src \|\| !orig->dest)
	290	return -1;
	291
	292	if (strcmp(orig->type, "lvm")) {
	293	const char *vg;
	294
	295	if (snap) {
	296	ERROR("LVM snapshot from %s backing store is not supported",
	297	orig->type);
	298	return -1;
	299	}
	300	vg = lxc_global_config_value("lxc.bdev.lvm.vg");
	301	len = strlen("/dev/") + strlen(vg) + strlen(cname) + 2;
	302	if ((new->src = malloc(len)) == NULL)
	303	return -1;
	304	ret = snprintf(new->src, len, "/dev/%s/%s", vg, cname);
	305	if (ret < 0 \|\| ret >= len)
	306	return -1;
	307	} else {
	308	new->src = dir_new_path(orig->src, oldname, cname, oldpath, lxcpath);
	309	if (!new->src)
	310	return -1;
	311	}
	312
	313	if (orig->mntopts) {
	314	new->mntopts = strdup(orig->mntopts);
	315	if (!new->mntopts)
	316	return -1;
	317	}
	318
	319	len = strlen(lxcpath) + strlen(cname) + strlen("rootfs") + 3;
	320	new->dest = malloc(len);
	321	if (!new->dest)
	322	return -1;
	323	ret = snprintf(new->dest, len, "%s/%s/rootfs", lxcpath, cname);
	324	if (ret < 0 \|\| ret >= len)
	325	return -1;
	326	if (mkdir_p(new->dest, 0755) < 0)
	327	return -1;
	328
	329	if (is_blktype(orig)) {
	330	if (!newsize && blk_getsize(orig, &size) < 0) {
	331	ERROR("Error getting size of %s", orig->src);
	332	return -1;
	333	}
	334	if (detect_fs(orig, fstype, 100) < 0) {
	335	INFO("could not find fstype for %s, using ext3", orig->src);
	336	return -1;
	337	}
	338	} else {
	339	sprintf(fstype, "ext3");
	340	if (!newsize)
	341	size = DEFAULT_FS_SIZE;
	342	}
	343
	344	if (snap) {
	345	if (lvm_snapshot(orig->src, new->src, size) < 0) {
	346	ERROR("could not create %s snapshot of %s", new->src, orig->src);
	347	return -1;
	348	}
	349	} else {
	350	if (do_lvm_create(new->src, size, lxc_global_config_value("lxc.bdev.lvm.thin_pool")) < 0) {
	351	ERROR("Error creating new lvm blockdev");
352	return -1;
353	}
a5b18cb1 CB	354
	355	cmd_args[0] = fstype;
	356	cmd_args[1] = new->src;
	357	// create an fs in the loopback file
	358	ret = run_command(cmd_output, sizeof(cmd_output),
	359	do_mkfs_exec_wrapper, (void *)cmd_args);
	360	if (ret < 0)
2b9cbd53	361	return -1;
2b9cbd53 CB	362	}
	363
	364	return 0;
	365	}
	366
	367	int lvm_destroy(struct bdev *orig)
	368	{
	369	pid_t pid;
	370
	371	if ((pid = fork()) < 0)
	372	return -1;
	373	if (!pid) {
79816ab3	374	(void)setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
acf47e1b	375	execlp("lvremove", "lvremove", "-f", orig->src, (char *)NULL);
2b9cbd53 CB	376	exit(EXIT_FAILURE);
	377	}
	378	return wait_for_pid(pid);
	379	}
	380
	381	int lvm_create(struct bdev bdev, const char dest, const char *n,
	382	struct bdev_specs *specs)
	383	{
	384	const char vg, thinpool, fstype, lv = n;
	385	uint64_t sz;
	386	int ret, len;
a5b18cb1 CB	387	const char *cmd_args[2];
a5b18cb1 CB	388	char cmd_output[MAXPATHLEN];
2b9cbd53 CB	389
	390	if (!specs)
	391	return -1;
	392
	393	vg = specs->lvm.vg;
	394	if (!vg)
	395	vg = lxc_global_config_value("lxc.bdev.lvm.vg");
	396
	397	thinpool = specs->lvm.thinpool;
	398	if (!thinpool)
	399	thinpool = lxc_global_config_value("lxc.bdev.lvm.thin_pool");
	400
	401	/* /dev/$vg/$lv */
	402	if (specs->lvm.lv)
	403	lv = specs->lvm.lv;
	404
	405	len = strlen(vg) + strlen(lv) + 7;
	406	bdev->src = malloc(len);
	407	if (!bdev->src)
	408	return -1;
	409
	410	ret = snprintf(bdev->src, len, "/dev/%s/%s", vg, lv);
	411	if (ret < 0 \|\| ret >= len)
	412	return -1;
	413
	414	// fssize is in bytes.
	415	sz = specs->fssize;
	416	if (!sz)
	417	sz = DEFAULT_FS_SIZE;
	418
	419	if (do_lvm_create(bdev->src, sz, thinpool) < 0) {
	420	ERROR("Error creating new lvm blockdev %s size %"PRIu64" bytes", bdev->src, sz);
	421	return -1;
	422	}
	423
	424	fstype = specs->fstype;
	425	if (!fstype)
	426	fstype = DEFAULT_FSTYPE;
a5b18cb1 CB	427
	428	cmd_args[0] = fstype;
	429	cmd_args[1] = bdev->src;
	430	ret = run_command(cmd_output, sizeof(cmd_output), do_mkfs_exec_wrapper,
	431	(void *)cmd_args);
	432	if (ret < 0)
2b9cbd53	433	return -1;
a5b18cb1	434
2b9cbd53 CB	435	if (!(bdev->dest = strdup(dest)))
	436	return -1;
	437
	438	if (mkdir_p(bdev->dest, 0755) < 0) {
	439	ERROR("Error creating %s", bdev->dest);
	440	return -1;
	441	}
	442
	443	return 0;
	444	}