[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
#include <inttypes.h>
#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 "lxcrsync.h"
#include "storage_utils.h"
#include "utils.h"

#ifdef MAJOR_IN_MKDEV
#include <sys/mkdev.h>
#endif

lxc_log_define(lxclvm, lxc);

struct lvcreate_args {
	const char *size;
	const char *vg;
	const char *lv;
	const char *thinpool;

	/* snapshot specific arguments */
	const char *source_lv;
};

static int lvm_destroy_exec_wrapper(void *data)
{
	struct lvcreate_args *args = data;

	(void)setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
	execlp("lvremove", "lvremove", "-f", args->lv, (char *)NULL);

	return -1;
}

static int lvm_create_exec_wrapper(void *data)
{
	struct lvcreate_args *args = data;

	(void)setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
	if (args->thinpool)
		execlp("lvcreate", "lvcreate", "--thinpool", args->thinpool,
		       "-V", args->size, args->vg, "-n", args->lv,
		       (char *)NULL);
	else
		execlp("lvcreate", "lvcreate", "-L", args->size, args->vg, "-n",
		       args->lv, (char *)NULL);

	return -1;
}

static int lvm_snapshot_exec_wrapper(void *data)
{
	struct lvcreate_args *args = data;

	(void)setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
	if (args->thinpool)
		execlp("lvcreate", "lvcreate", "-s", "-n", args->lv,
		       args->source_lv, (char *)NULL);
	else
		execlp("lvcreate", "lvcreate", "-s", "-L", args->size, "-n",
		       args->lv, args->source_lv, (char *)NULL);

	return -1;
}

/* The path must be "/dev/<vg>/<lv>". The volume group <vg> must be an existing
 * volume group, and the logical volume <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 logical volume from that
 * thin pool.
 */
static int do_lvm_create(const char *path, uint64_t size, const char *thinpool)
{
	int len, ret;
	char *pathdup, *vg, *lv;
	char cmd_output[MAXPATHLEN];
	char sz[24];
	char *tp = NULL;
	struct lvcreate_args cmd_args = {0};

	ret = snprintf(sz, 24, "%" PRIu64 "b", size);
	if (ret < 0 || ret >= 24) {
		ERROR("Failed to create string: %d", ret);
		return -1;
	}

	pathdup = strdup(path);
	if (!pathdup) {
		ERROR("Failed to duplicate string \"%s\"", path);
		return -1;
	}

	lv = strrchr(pathdup, '/');
	if (!lv) {
		ERROR("Failed to detect \"/\" in string \"%s\"", pathdup);
		free(pathdup);
		return -1;
	}
	*lv = '\0';
	lv++;
	TRACE("Parsed logical volume \"%s\"", lv);

	vg = strrchr(pathdup, '/');
	if (!vg) {
		ERROR("Failed to detect \"/\" in string \"%s\"", pathdup);
		free(pathdup);
		return -1;
	}
	vg++;
	TRACE("Parsed volume group \"%s\"", 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) {
			ERROR("Failed to create string: %d", ret);
			free(pathdup);
			return -1;
		}

		ret = lvm_is_thin_pool(tp);
		TRACE("got %d for thin pool at path: %s", ret, tp);
		if (ret < 0) {
			ERROR("Failed to detect whether \"%s\" is a thinpool", tp);
			free(pathdup);
			return -1;
		} else if (!ret) {
			TRACE("Detected that \"%s\" is not a thinpool", tp);
			tp = NULL;
		} else {
			TRACE("Detected \"%s\" is a thinpool", tp);
		}
	}

	cmd_args.thinpool = tp;
	cmd_args.vg = vg;
	cmd_args.lv = lv;
	cmd_args.size = sz;
	TRACE("Creating new lvm storage volume \"%s\" on volume group \"%s\" "
	      "of size \"%s\"", lv, vg, sz);
	ret = run_command(cmd_output, sizeof(cmd_output),
			  lvm_create_exec_wrapper, (void *)&cmd_args);
	if (ret < 0) {
		ERROR("Failed to create logical volume \"%s\": %s", lv,
		      cmd_output);
		free(pathdup);
		return -1;
	}
	TRACE("Created new lvm storage volume \"%s\" on volume group \"%s\" "
	      "of size \"%s\"", lv, vg, sz);

	free(pathdup);
	return ret;
}

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

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

	ret = stat(path, &statbuf);
	if (ret < 0)
		return false;

	if (!S_ISBLK(statbuf.st_mode))
		return false;

	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("Failed to create string");
		return false;
	}

	fd = open(devp, O_RDONLY);
	if (fd < 0)
		return false;

	ret = read(fd, buf, sizeof(buf));
	close(fd);
	if (ret != sizeof(buf))
		return false;

	if (strncmp(buf, "LVM-", 4))
		return false;

	return true;
}

int lvm_mount(struct bdev *bdev)
{
	char *src;

	if (strcmp(bdev->type, "lvm"))
		return -22;

	if (!bdev->src || !bdev->dest)
		return -22;

	src = lxc_storage_get_path(bdev->src, bdev->type);

	/* If we might pass in data sometime, then we'll have to enrich
	 * mount_unknown_fs().
	 */
	return mount_unknown_fs(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;
	char *cmd;
	char output[12];
	int start=0;
	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) {
		SYSERROR("popen failed");
		return -1;
	}

	if (!fgets(output, 12, f->f))
		ret = 1;

	status = lxc_pclose(f);
	/* Assume either vg or lvs do not exist, default comparison to false. */
	if (ret || WEXITSTATUS(status))
		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;
	char *pathdup, *lv;
	char sz[24];
	char cmd_output[MAXPATHLEN];
	struct lvcreate_args cmd_args = {0};

	ret = snprintf(sz, 24, "%" PRIu64 "b", size);
	if (ret < 0 || ret >= 24) {
		ERROR("Failed to create string");
		return -1;
	}

	pathdup = strdup(path);
	if (!pathdup) {
		ERROR("Failed to duplicate string \"%s\"", path);
		return -1;
	}

	lv = strrchr(pathdup, '/');
	if (!lv) {
		ERROR("Failed to detect \"/\" in string \"%s\"", pathdup);
		free(pathdup);
		return -1;
	}
	*lv = '\0';
	lv++;
	TRACE("Parsed logical volume \"%s\"", lv);

	/* Check if the original logical volume is backed by a thinpool, in
	 * which case we cannot specify a size that's different from the
	 * original size.
	 */
	ret = lvm_is_thin_volume(orig);
	if (ret < 0) {
		free(pathdup);
		return -1;
	} else if (ret) {
		cmd_args.thinpool = orig;
	}

	cmd_args.lv = lv;
	cmd_args.source_lv = orig;
	cmd_args.size = sz;
	TRACE("Creating new lvm snapshot \"%s\" of \"%s\" with size \"%s\"", lv,
	      orig, sz);
	ret = run_command(cmd_output, sizeof(cmd_output),
			  lvm_snapshot_exec_wrapper, (void *)&cmd_args);
	if (ret < 0) {
		ERROR("Failed to create logical volume \"%s\": %s", orig,
		      cmd_output);
		free(pathdup);
		return -1;
	}

	free(pathdup);
	return 0;
}

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)
{
	int len, ret;
	const char *vg;

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

	if (strcmp(orig->type, "lvm") && snap) {
		ERROR("LVM snapshot from \"%s\" storage driver is not supported",
		      orig->type);
		return -1;
	}

	if (strcmp(orig->type, "lvm")) {
		vg = lxc_global_config_value("lxc.bdev.lvm.vg");
		new->src = lxc_string_join(
		    "/",
		    (const char *[]){"lvm:", "dev", vg, cname, NULL},
		    false);
	} else {
		char *dup, *slider, *src;

		src = lxc_storage_get_path(orig->src, orig->type);

		dup = strdup(src);
		if (!dup) {
			ERROR("Failed to duplicate string \"%s\"", src);
			return -1;
		}

		slider = strrchr(dup, '/');
		if (!slider) {
			ERROR("Failed to detect \"/\" in string \"%s\"", dup);
			free(dup);
			return -1;
		}
		*slider = '\0';
		slider = dup;

		new->src = lxc_string_join(
		    "/",
		    (const char *[]){"lvm:", *slider == '/' ? ++slider : slider,
				     cname, NULL},
		    false);
		free(dup);
	}
	if (!new->src) {
		ERROR("Failed to create string");
		return -1;
	}

	if (orig->mntopts) {
		new->mntopts = strdup(orig->mntopts);
		if (!new->mntopts) {
			ERROR("Failed to duplicate string \"%s\"", orig->mntopts);
			return -1;
		}
	}

	len = strlen(lxcpath) + strlen(cname) + strlen("rootfs") + 3;
	new->dest = malloc(len);
	if (!new->dest) {
		ERROR("Failed to allocate memory");
		return -1;
	}

	ret = snprintf(new->dest, len, "%s/%s/rootfs", lxcpath, cname);
	if (ret < 0 || ret >= len) {
		ERROR("Failed to create string");
		return -1;
	}

	ret = mkdir_p(new->dest, 0755);
	if (ret < 0) {
		SYSERROR("Failed to create directory \"%s\"", new->dest);
		return -1;
	}

	return 0;
}

bool lvm_create_clone(struct lxc_conf *conf, struct bdev *orig,
		      struct bdev *new, uint64_t newsize)
{
	char *src;
	const char *thinpool;
	int ret;
	struct rsync_data data;
	char *cmd_args[2];
	char cmd_output[MAXPATHLEN];
	char fstype[100] = "ext4";
	uint64_t size = newsize;

	if (is_blktype(orig)) {
		/* detect size */
		if (!newsize && blk_getsize(orig, &size) < 0) {
			ERROR("Failed to detect size of logical volume \"%s\"",
			      orig->src);
			return -1;
		}

		/* detect filesystem */
		if (detect_fs(orig, fstype, 100) < 0) {
			INFO("Failed to detect filesystem type for \"%s\"", orig->src);
			return -1;
		}
	} else if (!newsize) {
			size = DEFAULT_FS_SIZE;
	}

	src = lxc_storage_get_path(new->src, "lvm");
	thinpool = lxc_global_config_value("lxc.bdev.lvm.thin_pool");

	ret = do_lvm_create(src, size, thinpool);
	if (ret < 0) {
		ERROR("Failed to create lvm storage volume \"%s\"", src);
		return -1;
	}

	cmd_args[0] = fstype;
	cmd_args[1] = src;
	ret = run_command(cmd_output, sizeof(cmd_output),
			do_mkfs_exec_wrapper, (void *)cmd_args);
	if (ret < 0) {
		ERROR("Failed to create new filesystem \"%s\" for lvm storage "
		      "volume \"%s\": %s", fstype, src, cmd_output);
		return -1;
	}

	data.orig = orig;
	data.new = new;
	ret = rsync_rootfs(&data);
	if (ret < 0) {
		ERROR("Failed to rsync from \"%s\" to \"%s\"", orig->dest,
		      new->dest);
		return false;
	}

	TRACE("Created lvm storage volume \"%s\"", new->dest);
	return true;
}

bool lvm_create_snapshot(struct lxc_conf *conf, struct bdev *orig,
			 struct bdev *new, uint64_t newsize)
{
	int ret;
	char *newsrc, *origsrc;
	uint64_t size = newsize;

	if (is_blktype(orig)) {
		if (!newsize && blk_getsize(orig, &size) < 0) {
			ERROR("Failed to detect size of logical volume \"%s\"",
			      orig->src);
			return -1;
		}
	} else if (!newsize) {
			size = DEFAULT_FS_SIZE;
	}

	origsrc = lxc_storage_get_path(orig->src, "lvm");
	newsrc = lxc_storage_get_path(new->src, "lvm");

	ret = lvm_snapshot(origsrc, newsrc, size);
	if (ret < 0) {
		ERROR("Failed to create lvm \"%s\" snapshot of \"%s\"",
		      new->src, orig->src);
		return false;
	}

	TRACE("Created lvm snapshot \"%s\" from \"%s\"", new->dest, orig->dest);
	return true;
}

int lvm_destroy(struct bdev *orig)
{
	int ret;
	char cmd_output[MAXPATHLEN];
	struct lvcreate_args cmd_args = {0};

	cmd_args.lv = lxc_storage_get_path(orig->src, "lvm");
	ret = run_command(cmd_output, sizeof(cmd_output),
			  lvm_destroy_exec_wrapper, (void *)&cmd_args);
	if (ret < 0) {
		ERROR("Failed to destroy logical volume \"%s\": %s", orig->src,
		      cmd_output);
		return -1;
	}

	TRACE("Destroyed logical volume \"%s\"", orig->src);
	return 0;
}

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) + 4 + 7;
	bdev->src = malloc(len);
	if (!bdev->src) {
		ERROR("Failed to allocate memory");
		return -1;
	}

	ret = snprintf(bdev->src, len, "lvm:/dev/%s/%s", vg, lv);
	if (ret < 0 || ret >= len) {
		ERROR("Failed to create string");
		return -1;
	}

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

	ret = do_lvm_create(bdev->src + 4, sz, thinpool);
	if (ret < 0) {
		ERROR("Error creating new logical volume \"%s\" of size "
		      "\"%" PRIu64 " bytes\"", bdev->src, sz);
		return -1;
	}

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

	cmd_args[0] = fstype;
	cmd_args[1] = lxc_storage_get_path(bdev->src, bdev->type);
	ret = run_command(cmd_output, sizeof(cmd_output), do_mkfs_exec_wrapper,
			  (void *)cmd_args);
	if (ret < 0) {
		ERROR("Failed to create new logical volume \"%s\": %s",
		      bdev->src, cmd_output);
		return -1;
	}

	bdev->dest = strdup(dest);
	if (!bdev->dest) {
		ERROR("Failed to duplicate string \"%s\"", dest);
		return -1;
	}

	ret = mkdir_p(bdev->dest, 0755);
	if (ret < 0) {
		SYSERROR("Failed to create directory \"%s\"", bdev->dest);
		return -1;
	}

	TRACE("Created new logical volume \"%s\"", bdev->dest);
	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
d91e13d8 CB	25	#define __STDC_FORMAT_MACROS
d91e13d8 CB	26	#include <inttypes.h>
2b9cbd53 CB	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"
d91e13d8	39	#include "lxcrsync.h"
f2d5a09d	40	#include "storage_utils.h"
2b9cbd53 CB	41	#include "utils.h"
2b9cbd53 CB	42
af6824fc	43	#ifdef MAJOR_IN_MKDEV
d91e13d8	44	#include <sys/mkdev.h>
af6824fc	45	#endif
af6824fc	46
2b9cbd53 CB	47	lxc_log_define(lxclvm, lxc);
2b9cbd53 CB	48
d91e13d8 CB	49	struct lvcreate_args {
	50	const char *size;
	51	const char *vg;
	52	const char *lv;
	53	const char *thinpool;
2b9cbd53	54
d91e13d8 CB	55	/* snapshot specific arguments */
	56	const char *source_lv;
	57	};
	58
	59	static int lvm_destroy_exec_wrapper(void *data)
	60	{
	61	struct lvcreate_args *args = data;
	62
	63	(void)setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
	64	execlp("lvremove", "lvremove", "-f", args->lv, (char *)NULL);
	65
	66	return -1;
	67	}
	68
	69	static int lvm_create_exec_wrapper(void *data)
	70	{
	71	struct lvcreate_args *args = data;
	72
	73	(void)setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
	74	if (args->thinpool)
	75	execlp("lvcreate", "lvcreate", "--thinpool", args->thinpool,
	76	"-V", args->size, args->vg, "-n", args->lv,
	77	(char *)NULL);
	78	else
	79	execlp("lvcreate", "lvcreate", "-L", args->size, args->vg, "-n",
	80	args->lv, (char *)NULL);
	81
	82	return -1;
	83	}
	84
	85	static int lvm_snapshot_exec_wrapper(void *data)
	86	{
	87	struct lvcreate_args *args = data;
	88
	89	(void)setenv("LVM_SUPPRESS_FD_WARNINGS", "1", 1);
	90	if (args->thinpool)
	91	execlp("lvcreate", "lvcreate", "-s", "-n", args->lv,
	92	args->source_lv, (char *)NULL);
	93	else
	94	execlp("lvcreate", "lvcreate", "-s", "-L", args->size, "-n",
	95	args->lv, args->source_lv, (char *)NULL);
	96
	97	return -1;
	98	}
	99
	100	/* The path must be "/dev/<vg>/<lv>". The volume group <vg> must be an existing
	101	* volume group, and the logical volume <lv> must not yet exist.
	102	* This function will attempt to create "/dev/<vg>/<lv> of size <size>. If
02b5e381	103	* thinpool is specified, we'll check for it's existence and if it's a valid
d91e13d8 CB	104	* thin pool, and if so, we'll create the requested logical volume from that
d91e13d8 CB	105	* thin pool.
02b5e381 CB	106	*/
02b5e381 CB	107	static int do_lvm_create(const char path, uint64_t size, const char thinpool)
2b9cbd53	108	{
d91e13d8 CB	109	int len, ret;
	110	char pathdup, vg, *lv;
	111	char cmd_output[MAXPATHLEN];
	112	char sz[24];
	113	char *tp = NULL;
	114	struct lvcreate_args cmd_args = {0};
2b9cbd53	115
d91e13d8 CB	116	ret = snprintf(sz, 24, "%" PRIu64 "b", size);
	117	if (ret < 0 \|\| ret >= 24) {
	118	ERROR("Failed to create string: %d", ret);
2b9cbd53 CB	119	return -1;
2b9cbd53 CB	120	}
2b9cbd53 CB	121
2b9cbd53 CB	122	pathdup = strdup(path);
d91e13d8 CB	123	if (!pathdup) {
	124	ERROR("Failed to duplicate string \"%s\"", path);
	125	return -1;
	126	}
2b9cbd53 CB	127
2b9cbd53 CB	128	lv = strrchr(pathdup, '/');
d91e13d8 CB	129	if (!lv) {
	130	ERROR("Failed to detect \"/\" in string \"%s\"", pathdup);
	131	free(pathdup);
	132	return -1;
	133	}
2b9cbd53 CB	134	*lv = '\0';
2b9cbd53 CB	135	lv++;
d91e13d8	136	TRACE("Parsed logical volume \"%s\"", lv);
2b9cbd53 CB	137
2b9cbd53 CB	138	vg = strrchr(pathdup, '/');
d91e13d8 CB	139	if (!vg) {
	140	ERROR("Failed to detect \"/\" in string \"%s\"", pathdup);
	141	free(pathdup);
	142	return -1;
	143	}
2b9cbd53	144	vg++;
d91e13d8	145	TRACE("Parsed volume group \"%s\"", vg);
2b9cbd53 CB	146
	147	if (thinpool) {
	148	len = strlen(pathdup) + strlen(thinpool) + 2;
	149	tp = alloca(len);
	150
	151	ret = snprintf(tp, len, "%s/%s", pathdup, thinpool);
d91e13d8 CB	152	if (ret < 0 \|\| ret >= len) {
	153	ERROR("Failed to create string: %d", ret);
	154	free(pathdup);
	155	return -1;
	156	}
2b9cbd53 CB	157
2b9cbd53 CB	158	ret = lvm_is_thin_pool(tp);
d91e13d8 CB	159	TRACE("got %d for thin pool at path: %s", ret, tp);
	160	if (ret < 0) {
	161	ERROR("Failed to detect whether \"%s\" is a thinpool", tp);
	162	free(pathdup);
	163	return -1;
	164	} else if (!ret) {
	165	TRACE("Detected that \"%s\" is not a thinpool", tp);
2b9cbd53	166	tp = NULL;
d91e13d8 CB	167	} else {
	168	TRACE("Detected \"%s\" is a thinpool", tp);
	169	}
2b9cbd53 CB	170	}
2b9cbd53 CB	171
d91e13d8 CB	172	cmd_args.thinpool = tp;
	173	cmd_args.vg = vg;
	174	cmd_args.lv = lv;
	175	cmd_args.size = sz;
	176	TRACE("Creating new lvm storage volume \"%s\" on volume group \"%s\" "
	177	"of size \"%s\"", lv, vg, sz);
	178	ret = run_command(cmd_output, sizeof(cmd_output),
	179	lvm_create_exec_wrapper, (void *)&cmd_args);
	180	if (ret < 0) {
	181	ERROR("Failed to create logical volume \"%s\": %s", lv,
	182	cmd_output);
	183	free(pathdup);
	184	return -1;
	185	}
	186	TRACE("Created new lvm storage volume \"%s\" on volume group \"%s\" "
	187	"of size \"%s\"", lv, vg, sz);
2b9cbd53	188
d91e13d8 CB	189	free(pathdup);
d91e13d8 CB	190	return ret;
2b9cbd53 CB	191	}
2b9cbd53 CB	192
d91e13d8 CB	193	/* Look at "/sys/dev/block/maj:min/dm/uuid". If it contains the hardcoded LVM
d91e13d8 CB	194	* prefix "LVM-" then this is an lvm2 LV.
2b9cbd53	195	*/
3d2ae1e2	196	bool lvm_detect(const char *path)
2b9cbd53	197	{
d91e13d8 CB	198	int fd;
d91e13d8 CB	199	ssize_t ret;
2b9cbd53	200	struct stat statbuf;
d91e13d8	201	char devp[MAXPATHLEN], buf[4];
2b9cbd53	202
f7ac4459	203	if (!strncmp(path, "lvm:", 4))
3d2ae1e2	204	return true;
2b9cbd53 CB	205
2b9cbd53 CB	206	ret = stat(path, &statbuf);
d91e13d8	207	if (ret < 0)
3d2ae1e2	208	return false;
d91e13d8	209
2b9cbd53	210	if (!S_ISBLK(statbuf.st_mode))
3d2ae1e2	211	return false;
2b9cbd53 CB	212
2b9cbd53 CB	213	ret = snprintf(devp, MAXPATHLEN, "/sys/dev/block/%d:%d/dm/uuid",
d91e13d8	214	major(statbuf.st_rdev), minor(statbuf.st_rdev));
2b9cbd53	215	if (ret < 0 \|\| ret >= MAXPATHLEN) {
d91e13d8	216	ERROR("Failed to create string");
3d2ae1e2	217	return false;
2b9cbd53	218	}
d91e13d8 CB	219
	220	fd = open(devp, O_RDONLY);
	221	if (fd < 0)
3d2ae1e2	222	return false;
d91e13d8 CB	223
	224	ret = read(fd, buf, sizeof(buf));
	225	close(fd);
	226	if (ret != sizeof(buf))
3d2ae1e2	227	return false;
d91e13d8 CB	228
d91e13d8 CB	229	if (strncmp(buf, "LVM-", 4))
3d2ae1e2	230	return false;
d91e13d8	231
3d2ae1e2	232	return true;
2b9cbd53 CB	233	}
	234
	235	int lvm_mount(struct bdev *bdev)
	236	{
11274f69 CB	237	char *src;
11274f69 CB	238
2b9cbd53 CB	239	if (strcmp(bdev->type, "lvm"))
2b9cbd53 CB	240	return -22;
11274f69	241
2b9cbd53 CB	242	if (!bdev->src \|\| !bdev->dest)
2b9cbd53 CB	243	return -22;
11274f69 CB	244
	245	src = lxc_storage_get_path(bdev->src, bdev->type);
	246
	247	/* If we might pass in data sometime, then we'll have to enrich
	248	* mount_unknown_fs().
	249	*/
	250	return mount_unknown_fs(src, bdev->dest, bdev->mntopts);
2b9cbd53 CB	251	}
	252
	253	int lvm_umount(struct bdev *bdev)
	254	{
	255	if (strcmp(bdev->type, "lvm"))
	256	return -22;
11274f69	257
2b9cbd53 CB	258	if (!bdev->src \|\| !bdev->dest)
2b9cbd53 CB	259	return -22;
11274f69	260
2b9cbd53 CB	261	return umount(bdev->dest);
	262	}
	263
	264	int lvm_compare_lv_attr(const char *path, int pos, const char expected)
	265	{
	266	struct lxc_popen_FILE *f;
d91e13d8 CB	267	int ret, len, status;
	268	char *cmd;
	269	char output[12];
	270	int start=0;
2b9cbd53 CB	271	const char *lvscmd = "lvs --unbuffered --noheadings -o lv_attr %s 2>/dev/null";
	272
	273	len = strlen(lvscmd) + strlen(path) - 1;
	274	cmd = alloca(len);
	275
	276	ret = snprintf(cmd, len, lvscmd, path);
	277	if (ret < 0 \|\| ret >= len)
	278	return -1;
	279
	280	f = lxc_popen(cmd);
d91e13d8	281	if (!f) {
2b9cbd53 CB	282	SYSERROR("popen failed");
	283	return -1;
	284	}
	285
d91e13d8 CB	286	if (!fgets(output, 12, f->f))
d91e13d8 CB	287	ret = 1;
2b9cbd53 CB	288
2b9cbd53 CB	289	status = lxc_pclose(f);
d91e13d8	290	/* Assume either vg or lvs do not exist, default comparison to false. */
2b9cbd53	291	if (ret \|\| WEXITSTATUS(status))
2b9cbd53 CB	292	return 0;
	293
	294	len = strlen(output);
d91e13d8 CB	295	while (start < len && output[start] == ' ')
d91e13d8 CB	296	start++;
2b9cbd53 CB	297
	298	if (start + pos < len && output[start + pos] == expected)
	299	return 1;
	300
	301	return 0;
	302	}
	303
	304	int lvm_is_thin_volume(const char *path)
	305	{
	306	return lvm_compare_lv_attr(path, 6, 't');
	307	}
	308
	309	int lvm_is_thin_pool(const char *path)
	310	{
	311	return lvm_compare_lv_attr(path, 0, 't');
	312	}
	313
	314	int lvm_snapshot(const char orig, const char path, uint64_t size)
	315	{
d91e13d8 CB	316	int ret;
	317	char pathdup, lv;
	318	char sz[24];
	319	char cmd_output[MAXPATHLEN];
	320	struct lvcreate_args cmd_args = {0};
2b9cbd53	321
d91e13d8 CB	322	ret = snprintf(sz, 24, "%" PRIu64 "b", size);
	323	if (ret < 0 \|\| ret >= 24) {
	324	ERROR("Failed to create string");
2b9cbd53 CB	325	return -1;
2b9cbd53 CB	326	}
2b9cbd53 CB	327
2b9cbd53 CB	328	pathdup = strdup(path);
d91e13d8 CB	329	if (!pathdup) {
	330	ERROR("Failed to duplicate string \"%s\"", path);
	331	return -1;
	332	}
	333
2b9cbd53 CB	334	lv = strrchr(pathdup, '/');
2b9cbd53 CB	335	if (!lv) {
d91e13d8	336	ERROR("Failed to detect \"/\" in string \"%s\"", pathdup);
2b9cbd53	337	free(pathdup);
d91e13d8	338	return -1;
2b9cbd53 CB	339	}
	340	*lv = '\0';
	341	lv++;
d91e13d8	342	TRACE("Parsed logical volume \"%s\"", lv);
2b9cbd53	343
d91e13d8 CB	344	/* Check if the original logical volume is backed by a thinpool, in
	345	* which case we cannot specify a size that's different from the
	346	* original size.
	347	*/
2b9cbd53	348	ret = lvm_is_thin_volume(orig);
d91e13d8	349	if (ret < 0) {
2b9cbd53 CB	350	free(pathdup);
2b9cbd53 CB	351	return -1;
d91e13d8 CB	352	} else if (ret) {
d91e13d8 CB	353	cmd_args.thinpool = orig;
2b9cbd53 CB	354	}
2b9cbd53 CB	355
d91e13d8 CB	356	cmd_args.lv = lv;
	357	cmd_args.source_lv = orig;
	358	cmd_args.size = sz;
	359	TRACE("Creating new lvm snapshot \"%s\" of \"%s\" with size \"%s\"", lv,
	360	orig, sz);
	361	ret = run_command(cmd_output, sizeof(cmd_output),
	362	lvm_snapshot_exec_wrapper, (void *)&cmd_args);
	363	if (ret < 0) {
	364	ERROR("Failed to create logical volume \"%s\": %s", orig,
	365	cmd_output);
	366	free(pathdup);
	367	return -1;
2b9cbd53 CB	368	}
	369
	370	free(pathdup);
d91e13d8	371	return 0;
2b9cbd53 CB	372	}
	373
	374	int lvm_clonepaths(struct bdev orig, struct bdev new, const char *oldname,
	375	const char cname, const char oldpath, const char *lxcpath, int snap,
	376	uint64_t newsize, struct lxc_conf *conf)
	377	{
2b9cbd53	378	int len, ret;
d91e13d8	379	const char *vg;
2b9cbd53 CB	380
	381	if (!orig->src \|\| !orig->dest)
	382	return -1;
	383
d91e13d8 CB	384	if (strcmp(orig->type, "lvm") && snap) {
	385	ERROR("LVM snapshot from \"%s\" storage driver is not supported",
	386	orig->type);
	387	return -1;
	388	}
2b9cbd53	389
d91e13d8	390	if (strcmp(orig->type, "lvm")) {
2b9cbd53	391	vg = lxc_global_config_value("lxc.bdev.lvm.vg");
d91e13d8 CB	392	new->src = lxc_string_join(
	393	"/",
	394	(const char *[]){"lvm:", "dev", vg, cname, NULL},
	395	false);
	396	} else {
	397	char dup, slider, *src;
01e5fa07	398
d91e13d8	399	src = lxc_storage_get_path(orig->src, orig->type);
11274f69	400
d91e13d8 CB	401	dup = strdup(src);
	402	if (!dup) {
	403	ERROR("Failed to duplicate string \"%s\"", src);
2b9cbd53	404	return -1;
d91e13d8 CB	405	}
	406
	407	slider = strrchr(dup, '/');
	408	if (!slider) {
	409	ERROR("Failed to detect \"/\" in string \"%s\"", dup);
	410	free(dup);
2b9cbd53	411	return -1;
d91e13d8 CB	412	}
	413	*slider = '\0';
	414	slider = dup;
	415
	416	new->src = lxc_string_join(
	417	"/",
	418	(const char []){"lvm:", slider == '/' ? ++slider : slider,
	419	cname, NULL},
	420	false);
	421	free(dup);
	422	}
	423	if (!new->src) {
	424	ERROR("Failed to create string");
	425	return -1;
2b9cbd53 CB	426	}
	427
	428	if (orig->mntopts) {
	429	new->mntopts = strdup(orig->mntopts);
d91e13d8 CB	430	if (!new->mntopts) {
d91e13d8 CB	431	ERROR("Failed to duplicate string \"%s\"", orig->mntopts);
2b9cbd53	432	return -1;
d91e13d8	433	}
2b9cbd53 CB	434	}
	435
	436	len = strlen(lxcpath) + strlen(cname) + strlen("rootfs") + 3;
	437	new->dest = malloc(len);
d91e13d8 CB	438	if (!new->dest) {
d91e13d8 CB	439	ERROR("Failed to allocate memory");
2b9cbd53	440	return -1;
d91e13d8 CB	441	}
d91e13d8 CB	442
2b9cbd53	443	ret = snprintf(new->dest, len, "%s/%s/rootfs", lxcpath, cname);
d91e13d8 CB	444	if (ret < 0 \|\| ret >= len) {
d91e13d8 CB	445	ERROR("Failed to create string");
2b9cbd53	446	return -1;
d91e13d8 CB	447	}
	448
	449	ret = mkdir_p(new->dest, 0755);
	450	if (ret < 0) {
	451	SYSERROR("Failed to create directory \"%s\"", new->dest);
2b9cbd53	452	return -1;
d91e13d8 CB	453	}
	454
	455	return 0;
	456	}
	457
	458	bool lvm_create_clone(struct lxc_conf conf, struct bdev orig,
	459	struct bdev *new, uint64_t newsize)
	460	{
	461	char *src;
	462	const char *thinpool;
	463	int ret;
	464	struct rsync_data data;
	465	char *cmd_args[2];
	466	char cmd_output[MAXPATHLEN];
	467	char fstype[100] = "ext4";
	468	uint64_t size = newsize;
2b9cbd53 CB	469
2b9cbd53 CB	470	if (is_blktype(orig)) {
d91e13d8	471	/* detect size */
2b9cbd53	472	if (!newsize && blk_getsize(orig, &size) < 0) {
d91e13d8 CB	473	ERROR("Failed to detect size of logical volume \"%s\"",
d91e13d8 CB	474	orig->src);
2b9cbd53 CB	475	return -1;
2b9cbd53 CB	476	}
d91e13d8 CB	477
d91e13d8 CB	478	/* detect filesystem */
2b9cbd53	479	if (detect_fs(orig, fstype, 100) < 0) {
d91e13d8	480	INFO("Failed to detect filesystem type for \"%s\"", orig->src);
2b9cbd53 CB	481	return -1;
2b9cbd53 CB	482	}
d91e13d8	483	} else if (!newsize) {
2b9cbd53 CB	484	size = DEFAULT_FS_SIZE;
	485	}
	486
d91e13d8 CB	487	src = lxc_storage_get_path(new->src, "lvm");
d91e13d8 CB	488	thinpool = lxc_global_config_value("lxc.bdev.lvm.thin_pool");
11274f69	489
d91e13d8 CB	490	ret = do_lvm_create(src, size, thinpool);
	491	if (ret < 0) {
	492	ERROR("Failed to create lvm storage volume \"%s\"", src);
	493	return -1;
	494	}
11274f69	495
d91e13d8 CB	496	cmd_args[0] = fstype;
	497	cmd_args[1] = src;
	498	ret = run_command(cmd_output, sizeof(cmd_output),
	499	do_mkfs_exec_wrapper, (void *)cmd_args);
	500	if (ret < 0) {
	501	ERROR("Failed to create new filesystem \"%s\" for lvm storage "
	502	"volume \"%s\": %s", fstype, src, cmd_output);
	503	return -1;
	504	}
	505
	506	data.orig = orig;
	507	data.new = new;
	508	ret = rsync_rootfs(&data);
	509	if (ret < 0) {
	510	ERROR("Failed to rsync from \"%s\" to \"%s\"", orig->dest,
	511	new->dest);
	512	return false;
	513	}
	514
	515	TRACE("Created lvm storage volume \"%s\"", new->dest);
	516	return true;
	517	}
11274f69	518
d91e13d8 CB	519	bool lvm_create_snapshot(struct lxc_conf conf, struct bdev orig,
	520	struct bdev *new, uint64_t newsize)
	521	{
	522	int ret;
	523	char newsrc, origsrc;
	524	uint64_t size = newsize;
	525
	526	if (is_blktype(orig)) {
	527	if (!newsize && blk_getsize(orig, &size) < 0) {
	528	ERROR("Failed to detect size of logical volume \"%s\"",
	529	orig->src);
2b9cbd53 CB	530	return -1;
2b9cbd53 CB	531	}
d91e13d8 CB	532	} else if (!newsize) {
	533	size = DEFAULT_FS_SIZE;
	534	}
a5b18cb1	535
d91e13d8 CB	536	origsrc = lxc_storage_get_path(orig->src, "lvm");
	537	newsrc = lxc_storage_get_path(new->src, "lvm");
	538
	539	ret = lvm_snapshot(origsrc, newsrc, size);
	540	if (ret < 0) {
	541	ERROR("Failed to create lvm \"%s\" snapshot of \"%s\"",
	542	new->src, orig->src);
	543	return false;
2b9cbd53 CB	544	}
2b9cbd53 CB	545
d91e13d8 CB	546	TRACE("Created lvm snapshot \"%s\" from \"%s\"", new->dest, orig->dest);
d91e13d8 CB	547	return true;
2b9cbd53 CB	548	}
	549
	550	int lvm_destroy(struct bdev *orig)
	551	{
d91e13d8 CB	552	int ret;
	553	char cmd_output[MAXPATHLEN];
	554	struct lvcreate_args cmd_args = {0};
	555
	556	cmd_args.lv = lxc_storage_get_path(orig->src, "lvm");
	557	ret = run_command(cmd_output, sizeof(cmd_output),
	558	lvm_destroy_exec_wrapper, (void *)&cmd_args);
	559	if (ret < 0) {
	560	ERROR("Failed to destroy logical volume \"%s\": %s", orig->src,
	561	cmd_output);
2b9cbd53	562	return -1;
2b9cbd53	563	}
11274f69	564
d91e13d8 CB	565	TRACE("Destroyed logical volume \"%s\"", orig->src);
d91e13d8 CB	566	return 0;
2b9cbd53 CB	567	}
	568
	569	int lvm_create(struct bdev bdev, const char dest, const char *n,
d91e13d8	570	struct bdev_specs *specs)
2b9cbd53 CB	571	{
	572	const char vg, thinpool, fstype, lv = n;
	573	uint64_t sz;
	574	int ret, len;
a5b18cb1 CB	575	const char *cmd_args[2];
a5b18cb1 CB	576	char cmd_output[MAXPATHLEN];
2b9cbd53 CB	577
	578	if (!specs)
	579	return -1;
	580
	581	vg = specs->lvm.vg;
	582	if (!vg)
	583	vg = lxc_global_config_value("lxc.bdev.lvm.vg");
	584
	585	thinpool = specs->lvm.thinpool;
	586	if (!thinpool)
	587	thinpool = lxc_global_config_value("lxc.bdev.lvm.thin_pool");
	588
	589	/* /dev/$vg/$lv */
	590	if (specs->lvm.lv)
	591	lv = specs->lvm.lv;
	592
11274f69	593	len = strlen(vg) + strlen(lv) + 4 + 7;
2b9cbd53	594	bdev->src = malloc(len);
d91e13d8 CB	595	if (!bdev->src) {
d91e13d8 CB	596	ERROR("Failed to allocate memory");
2b9cbd53	597	return -1;
d91e13d8	598	}
2b9cbd53	599
11274f69	600	ret = snprintf(bdev->src, len, "lvm:/dev/%s/%s", vg, lv);
d91e13d8 CB	601	if (ret < 0 \|\| ret >= len) {
d91e13d8 CB	602	ERROR("Failed to create string");
2b9cbd53	603	return -1;
d91e13d8	604	}
2b9cbd53	605
d91e13d8	606	/* size is in bytes */
2b9cbd53 CB	607	sz = specs->fssize;
	608	if (!sz)
	609	sz = DEFAULT_FS_SIZE;
	610
d91e13d8 CB	611	ret = do_lvm_create(bdev->src + 4, sz, thinpool);
	612	if (ret < 0) {
	613	ERROR("Error creating new logical volume \"%s\" of size "
	614	"\"%" PRIu64 " bytes\"", bdev->src, sz);
2b9cbd53 CB	615	return -1;
	616	}
	617
	618	fstype = specs->fstype;
	619	if (!fstype)
	620	fstype = DEFAULT_FSTYPE;
a5b18cb1 CB	621
a5b18cb1 CB	622	cmd_args[0] = fstype;
d91e13d8	623	cmd_args[1] = lxc_storage_get_path(bdev->src, bdev->type);
a5b18cb1 CB	624	ret = run_command(cmd_output, sizeof(cmd_output), do_mkfs_exec_wrapper,
a5b18cb1 CB	625	(void *)cmd_args);
d91e13d8 CB	626	if (ret < 0) {
	627	ERROR("Failed to create new logical volume \"%s\": %s",
	628	bdev->src, cmd_output);
2b9cbd53	629	return -1;
d91e13d8	630	}
a5b18cb1	631
d91e13d8 CB	632	bdev->dest = strdup(dest);
	633	if (!bdev->dest) {
	634	ERROR("Failed to duplicate string \"%s\"", dest);
2b9cbd53	635	return -1;
d91e13d8	636	}
2b9cbd53	637
d91e13d8 CB	638	ret = mkdir_p(bdev->dest, 0755);
	639	if (ret < 0) {
	640	SYSERROR("Failed to create directory \"%s\"", bdev->dest);
2b9cbd53 CB	641	return -1;
	642	}
	643
d91e13d8	644	TRACE("Created new logical volume \"%s\"", bdev->dest);
2b9cbd53 CB	645	return 0;
2b9cbd53 CB	646	}