src/lib/image.c - vzctl - Rivoreo Source Code Repositories

 /*
  *  Copyright (C) 2011-2012, Parallels, Inc. All rights reserved.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program 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 General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */

 #include <stdlib.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/mount.h>
 #include <limits.h>
 #include <fcntl.h>
 #include <errno.h>
 #include <string.h>

 #include "image.h"
 #include "logger.h"
 #include "list.h"
 #include "util.h"
 #include "vzerror.h"
 #include "vzctl.h"
 #include "env.h"
 #include "destroy.h"

 #define DEFAULT_FSTYPE		"ext4"
 #define VZCTL_VE_ROOTHDD_DIR	"root.hdd"

 int get_ploop_type(const char *type)
 {
 	if (type == NULL)
 		return -1;
 	if (!strcmp(type, "expanded"))
 		return PLOOP_EXPANDED_MODE;
 	else if (!strcmp(type, "plain"))
 		return PLOOP_EXPANDED_PREALLOCATED_MODE;
 	else if (!strcmp(type, "raw"))
 		return PLOOP_RAW_MODE;

 	return -1;
 }

 int is_ploop_supported(void)
 {
 	int minor;
 	/* Use ploop_getdevice because it's a call that
 	 * - doesn't change anything
 	 * - fails if ploop is not available
 	 */
 	return (ploop_getdevice(&minor) == 0);
 }

 int is_image_mounted(const char *ve_private)
 {
 	int ret;
 	char dev[64];
 	char fname[PATH_MAX];
 	struct ploop_disk_images_data *di;

 	di = ploop_alloc_diskdescriptor();
 	if (di == NULL)
 		return -1;
 	GET_DISK_DESCRIPTOR(fname, ve_private);
 	ret = ploop_read_diskdescriptor(fname, di);
 	if (ret) {
 		logger(-1, 0, "Failed to read %s", fname);
 		ploop_free_diskdescriptor(di);
 		return -1;
 	}
 	ret = ploop_get_dev(di, dev, sizeof(dev));
 	ploop_free_diskdescriptor(di);

 	return (ret == 0);
 }

 int vzctl_mount_image(const char *ve_private, struct vzctl_mount_param *param)
 {
 	int ret;
 	struct ploop_mount_param mount_param = {};
 	char fname[PATH_MAX];
 	struct ploop_disk_images_data *di;

 	di = ploop_alloc_diskdescriptor();
 	if (di == NULL)
 		return VZ_RESOURCE_ERROR;
 	GET_DISK_DESCRIPTOR(fname, ve_private);
 	ret = ploop_read_diskdescriptor(fname, di);
 	if (ret) {
 		logger(-1, 0, "Failed to read %s", fname);
 		ploop_free_diskdescriptor(di);
 		return VZCTL_E_MOUNT_IMAGE;
 	}

 	mount_param.fstype = DEFAULT_FSTYPE;
 	mount_param.target = param->target;
 	mount_param.quota = param->quota;
 	mount_param.mount_data = param->mount_data;

 	ret = ploop_mount_image(di, &mount_param);
 	if (ret) {
 		logger(-1, 0, "Failed to mount image: %s [%d]",
 				ploop_get_last_error(), ret);
 		ret = VZCTL_E_MOUNT_IMAGE;
 	}
 	ploop_free_diskdescriptor(di);
 	return ret;
 }

 int vzctl_umount_image(const char *ve_private)
 {
 	int ret;
 	char fname[PATH_MAX];
 	struct ploop_disk_images_data *di;

 	di = ploop_alloc_diskdescriptor();
 	if (di == NULL)
 		return VZ_RESOURCE_ERROR;

 	GET_DISK_DESCRIPTOR(fname, ve_private);
 	ret = ploop_read_diskdescriptor(fname, di);
 	if (ret) {
 		logger(-1, 0, "Failed to read %s", fname);
 		ploop_free_diskdescriptor(di);
 		return VZCTL_E_UMOUNT_IMAGE;
 	}

 	ret = ploop_umount_image(di);
 	if (ret) {
 		logger(-1, 0, "Failed to umount image: %s [%d]",
 				ploop_get_last_error(), ret);
 		ret = VZCTL_E_UMOUNT_IMAGE;
 	}
 	ploop_free_diskdescriptor(di);
 	return ret;
 }

 int vzctl_create_image(const char *ve_private,
 		struct vzctl_create_image_param *param)
 {
 	int ret = 0;
 	struct ploop_create_param create_param = {};
 	char dir[PATH_MAX];
 	char image[PATH_MAX];

 	snprintf(dir, sizeof(dir), "%s/" VZCTL_VE_ROOTHDD_DIR, ve_private);
 	ret = make_dir_mode(dir, 1, 0700);
 	if (ret)
 		return ret;

 	snprintf(image, sizeof(image), "%s/root.hdd", dir);

 	logger(0, 0, "Creating image: %s size=%luK", image, param->size);
 	create_param.mode = param->mode;
 	create_param.fstype = DEFAULT_FSTYPE;
 	create_param.size = param->size * 2; /* Kb to 512b sectors */
 	create_param.image = image;
 	ret = ploop_create_image(&create_param);
 	if (ret) {
 		rmdir(dir);
 		logger(-1, 0, "Failed to create image: %s [%d]",
 				ploop_get_last_error(), ret);
 		return VZCTL_E_CREATE_IMAGE;
 	}
 	return 0;
 }

 int vzctl_convert_image(const char *ve_private, int mode)
 {
 	int ret;
 	char fname[PATH_MAX];
 	struct ploop_disk_images_data *di;

 	di = ploop_alloc_diskdescriptor();
 	if (di == NULL)
 		return VZ_RESOURCE_ERROR;
 	GET_DISK_DESCRIPTOR(fname, ve_private);
 	ret = ploop_read_diskdescriptor(fname, di);
 	if (ret) {
 		logger(-1, 0, "Failed to read %s", fname);
 		ploop_free_diskdescriptor(di);
 		return VZCTL_E_CONVERT_IMAGE;
 	}
 	ret = ploop_convert_image(di, mode, 0);
 	if (ret) {
 		logger(-1, 0, "Failed to convert image: %s [%d]",
 				ploop_get_last_error(), ret);
 		ret = VZCTL_E_CONVERT_IMAGE;
 	}
 	ploop_free_diskdescriptor(di);
 	return ret;
 }

 int vzctl_resize_image(const char *ve_private, unsigned long long newsize)
 {
 	int ret;
 	struct ploop_disk_images_data *di;
 	struct ploop_resize_param param;
 	char fname[PATH_MAX];

 	if (ve_private == NULL) {
 		logger(-1, 0, "Failed to resize image: "
 				"CT private is not specified");
 		return VZCTL_E_RESIZE_IMAGE;
 	}

 	if (check_ploop_size(newsize) < 0)
 		return VZ_DISKSPACE_NOT_SET;

 	di = ploop_alloc_diskdescriptor();
 	if (di == NULL)
 		return VZ_RESOURCE_ERROR;
 	GET_DISK_DESCRIPTOR(fname, ve_private);
 	ret = ploop_read_diskdescriptor(fname, di);
 	if (ret) {
 		logger(-1, 0, "Failed to read %s", fname);
 		ploop_free_diskdescriptor(di);
 		return VZCTL_E_RESIZE_IMAGE;
 	}
 	param.size = newsize * 2; /* Kb to 512b sectors */
 	ret = ploop_resize_image(di, &param);
 	if (ret) {
 		logger(-1, 0, "Failed to resize image: %s [%d]",
 				ploop_get_last_error(), ret);
 		ret = VZCTL_E_RESIZE_IMAGE;
 	}
 	ploop_free_diskdescriptor(di);
 	return ret;
 }

 int vzctl_get_ploop_dev(const char *mnt, char *out, int len)
 {
 	return ploop_get_partition_by_mnt(mnt, out, len);
 }

 int vzctl_create_snapshot(const char *ve_private, const char *guid)
 {
 	char fname[PATH_MAX];
 	struct ploop_disk_images_data *di;
 	int ret;
 	struct ploop_snapshot_param param = {};

 	if (ve_private == NULL) {
 		logger(-1, 0, "Failed to create snapshot: "
 				"CT private is not specified");
 		return VZ_VE_PRIVATE_NOTSET;
 	}
 	di = ploop_alloc_diskdescriptor();
 	if (di == NULL)
 		return VZ_RESOURCE_ERROR;
 	GET_DISK_DESCRIPTOR(fname, ve_private);
 	if (ploop_read_diskdescriptor(fname, di)) {
 		logger(-1, 0, "Failed to read %s", fname);
 		ploop_free_diskdescriptor(di);
 		return VZCTL_E_CREATE_SNAPSHOT;
 	}
 	param.guid = strdup(guid);
 	ret = ploop_create_snapshot(di, &param);
 	free(param.guid);
 	if (ret) {
 		logger(-1, 0, "Failed to create snapshot: %s [%d]",
 				ploop_get_last_error(), ret);
 		ret = VZCTL_E_CREATE_SNAPSHOT;
 	}
 	ploop_free_diskdescriptor(di);

 	return ret;
 }

 int vzctl_delete_snapshot(const char *ve_private, const char *guid)
 {
 	char fname[PATH_MAX];
 	struct ploop_disk_images_data *di;
 	int ret;

 	if (ve_private == NULL) {
 		logger(-1, 0, "Failed to delete snapshot: "
 				"CT private is not specified");
 		return VZ_VE_PRIVATE_NOTSET;
 	}
 	di = ploop_alloc_diskdescriptor();
 	if (di == NULL)
 		return VZ_RESOURCE_ERROR;
 	GET_DISK_DESCRIPTOR(fname, ve_private);
 	if (ploop_read_diskdescriptor(fname, di)) {
 		logger(-1, 0, "Failed to read %s", fname);
 		ploop_free_diskdescriptor(di);
 		return VZCTL_E_CREATE_SNAPSHOT;
 	}
 	ret = ploop_delete_snapshot(di, guid);
 	if (ret) {
 		logger(-1, 0, "Failed to delete snapshot: %s [%d]",
 				ploop_get_last_error(), ret);
 		ret = VZCTL_E_DELETE_SNAPSHOT;
 	}
 	ploop_free_diskdescriptor(di);

 	return ret;
 }

 int vzctl_merge_snapshot(const char *ve_private, const char *guid)
 {
 	char fname[PATH_MAX];
 	struct ploop_disk_images_data *di;
 	int ret;
 	struct ploop_merge_param param = {};

 	if (guid == NULL)
 		return VZCTL_E_MERGE_SNAPSHOT;
 	if (ve_private == NULL) {
 		logger(-1, 0, "Failed to merge snapshot: "
 				"CT private is not specified");
 		return VZ_VE_PRIVATE_NOTSET;
 	}
 	di = ploop_alloc_diskdescriptor();
 	if (di == NULL)
 		return VZ_RESOURCE_ERROR;
 	GET_DISK_DESCRIPTOR(fname, ve_private);
 	ret = VZCTL_E_MERGE_SNAPSHOT;
 	if (ploop_read_diskdescriptor(fname, di)) {
 		logger(-1, 0, "Failed to read %s", fname);
 		goto err;
 	}
 	param.guid = guid;
 	ret = ploop_merge_snapshot(di, &param);
 	if (ret) {
 		logger(-1, 0, "Failed to merge snapshot %s: %s [%d]",
 				guid, ploop_get_last_error(), ret);
 		goto err;
 	}
 err:
 	ploop_free_diskdescriptor(di);

 	return (ret = 0) ? 0: VZCTL_E_MERGE_SNAPSHOT;
 }

 int ve_private_is_ploop(const char *private)
 {
 	char image[PATH_MAX];

 	snprintf(image, sizeof(image), "%s/%s/root.hdd",
 			private, VZCTL_VE_ROOTHDD_DIR);
 	return stat_file(image);
 }

 int check_ploop_size(unsigned long size)
 {
 	const unsigned long max_size = /* 2T - 2G - 1M, in Kb */
 		(2ull << 30) - (2ull << 20) - (1 << 10);

 	if (size < max_size)
 		return 0;

 	logger(-1, 0, "Error: diskspace is set too big for ploop: %lu KB "
 			"(max size is %lu KB)", size, max_size - 1);
 	return -1;

 }

 /* Convert a CT to ploop layout
  * 1) mount CT
  * 2) create & mount image
  * 3) cp VE_ROOT -> image
  * 4) update ve_layout
  */
 int vzctl_env_convert_ploop(vps_handler *h, envid_t veid,
 		fs_param *fs, dq_param *dq, int mode)
 {
 	struct vzctl_create_image_param param = {};
 	struct vzctl_mount_param mount_param = {};
 	int ret, ret2;
 	char cmd[STR_SIZE];
 	char new_private[STR_SIZE];

 	if (ve_private_is_ploop(fs->private)) {
 		logger(0, 0, "CT is already on ploop");
 		return 0;
 	}
 	if (!is_ploop_supported()) {
 		logger(-1, 0, "No ploop support in the kernel");
 		return VZ_BAD_KERNEL;
 	}
 	if (vps_is_run(h, veid)) {
 		logger(-1, 0, "CT is running (stop it first)");
 		return VZ_VE_RUNNING;
 	}
 	if (vps_is_mounted(fs->root)) {
 		logger(-1, 0, "CT is mounted (umount it first)");
 		return VZ_FS_MOUNTED;
 	}
 	if (!dq->diskspace || dq->diskspace[1] <= 0) {
 		logger(-1, 0, "Error: diskspace not set");
 		return VZ_DISKSPACE_NOT_SET;
 	}
 	if (check_ploop_size(dq->diskspace[1]) < 0)
 		return VZ_DISKSPACE_NOT_SET;

 	snprintf(new_private, sizeof(new_private), "%s.ploop", fs->private);
 	if (make_dir_mode(new_private, 1, 0600) != 0)
 		return VZ_CANT_CREATE_DIR;

 	param.mode = mode;
 	param.size = dq->diskspace[1]; // limit
 	ret = vzctl_create_image(new_private, &param);
 	if (ret)
 		goto err;

 	mount_param.target = fs->root;

 	ret = vzctl_mount_image(new_private, &mount_param);
 	if (ret)
 		goto err;

 	logger(0, 0, "Copying content to ploop...");
 	snprintf(cmd, sizeof(cmd), "/bin/cp -ax %s/. %s",
 			fs->private, fs->root);
 	logger(1, 0, "Executing %s", cmd);
 	ret = system(cmd);
 	ret2 = vzctl_umount_image(new_private);
 	if (ret) {
 		ret = VZ_SYSTEM_ERROR;
 		goto err;
 	}
 	if (ret2) {
 		/* Error message already printed by vzctl_umount_image() */
 		ret = ret2;
 		goto err;
 	}
 	/* Finally, del the old private and replace it with the new one */
 	del_dir(fs->private);
 	rename(new_private, fs->private);
 	logger(0, 0, "Container was successfully converted "
 			"to the ploop layout");
 err:
 	if (ret != 0)
 		del_dir(new_private);
 	return ret;
 }
	/*
	* Copyright (C) 2011-2012, Parallels, Inc. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program 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 General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <stdlib.h>
	#include <unistd.h>
	#include <stdio.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <sys/mount.h>
	#include <limits.h>
	#include <fcntl.h>
	#include <errno.h>
	#include <string.h>

	#include "image.h"
	#include "logger.h"
	#include "list.h"
	#include "util.h"
	#include "vzerror.h"
	#include "vzctl.h"
	#include "env.h"
	#include "destroy.h"

	#define DEFAULT_FSTYPE "ext4"
	#define VZCTL_VE_ROOTHDD_DIR "root.hdd"

	int get_ploop_type(const char *type)
	{
	if (type == NULL)
	return -1;
	if (!strcmp(type, "expanded"))
	return PLOOP_EXPANDED_MODE;
	else if (!strcmp(type, "plain"))
	return PLOOP_EXPANDED_PREALLOCATED_MODE;
	else if (!strcmp(type, "raw"))
	return PLOOP_RAW_MODE;

	return -1;
	}

	int is_ploop_supported(void)
	{
	int minor;
	/* Use ploop_getdevice because it's a call that
	* - doesn't change anything
	* - fails if ploop is not available
	*/
	return (ploop_getdevice(&minor) == 0);
	}

	int is_image_mounted(const char *ve_private)
	{
	int ret;
	char dev[64];
	char fname[PATH_MAX];
	struct ploop_disk_images_data *di;

	di = ploop_alloc_diskdescriptor();
	if (di == NULL)
	return -1;
	GET_DISK_DESCRIPTOR(fname, ve_private);
	ret = ploop_read_diskdescriptor(fname, di);
	if (ret) {
	logger(-1, 0, "Failed to read %s", fname);
	ploop_free_diskdescriptor(di);
	return -1;
	}
	ret = ploop_get_dev(di, dev, sizeof(dev));
	ploop_free_diskdescriptor(di);

	return (ret == 0);
	}

	int vzctl_mount_image(const char ve_private, struct vzctl_mount_param param)
	{
	int ret;
	struct ploop_mount_param mount_param = {};
	char fname[PATH_MAX];
	struct ploop_disk_images_data *di;

	di = ploop_alloc_diskdescriptor();
	if (di == NULL)
	return VZ_RESOURCE_ERROR;
	GET_DISK_DESCRIPTOR(fname, ve_private);
	ret = ploop_read_diskdescriptor(fname, di);
	if (ret) {
	logger(-1, 0, "Failed to read %s", fname);
	ploop_free_diskdescriptor(di);
	return VZCTL_E_MOUNT_IMAGE;
	}

	mount_param.fstype = DEFAULT_FSTYPE;
	mount_param.target = param->target;
	mount_param.quota = param->quota;
	mount_param.mount_data = param->mount_data;

	ret = ploop_mount_image(di, &mount_param);
	if (ret) {
	logger(-1, 0, "Failed to mount image: %s [%d]",
	ploop_get_last_error(), ret);
	ret = VZCTL_E_MOUNT_IMAGE;
	}
	ploop_free_diskdescriptor(di);
	return ret;
	}

	int vzctl_umount_image(const char *ve_private)
	{
	int ret;
	char fname[PATH_MAX];
	struct ploop_disk_images_data *di;

	di = ploop_alloc_diskdescriptor();
	if (di == NULL)
	return VZ_RESOURCE_ERROR;

	GET_DISK_DESCRIPTOR(fname, ve_private);
	ret = ploop_read_diskdescriptor(fname, di);
	if (ret) {
	logger(-1, 0, "Failed to read %s", fname);
	ploop_free_diskdescriptor(di);
	return VZCTL_E_UMOUNT_IMAGE;
	}

	ret = ploop_umount_image(di);
	if (ret) {
	logger(-1, 0, "Failed to umount image: %s [%d]",
	ploop_get_last_error(), ret);
	ret = VZCTL_E_UMOUNT_IMAGE;
	}
	ploop_free_diskdescriptor(di);
	return ret;
	}

	int vzctl_create_image(const char *ve_private,
	struct vzctl_create_image_param *param)
	{
	int ret = 0;
	struct ploop_create_param create_param = {};
	char dir[PATH_MAX];
	char image[PATH_MAX];

	snprintf(dir, sizeof(dir), "%s/" VZCTL_VE_ROOTHDD_DIR, ve_private);
	ret = make_dir_mode(dir, 1, 0700);
	if (ret)
	return ret;

	snprintf(image, sizeof(image), "%s/root.hdd", dir);

	logger(0, 0, "Creating image: %s size=%luK", image, param->size);
	create_param.mode = param->mode;
	create_param.fstype = DEFAULT_FSTYPE;
	create_param.size = param->size * 2; /* Kb to 512b sectors */
	create_param.image = image;
	ret = ploop_create_image(&create_param);
	if (ret) {
	rmdir(dir);
	logger(-1, 0, "Failed to create image: %s [%d]",
	ploop_get_last_error(), ret);
	return VZCTL_E_CREATE_IMAGE;
	}
	return 0;
	}

	int vzctl_convert_image(const char *ve_private, int mode)
	{
	int ret;
	char fname[PATH_MAX];
	struct ploop_disk_images_data *di;

	di = ploop_alloc_diskdescriptor();
	if (di == NULL)
	return VZ_RESOURCE_ERROR;
	GET_DISK_DESCRIPTOR(fname, ve_private);
	ret = ploop_read_diskdescriptor(fname, di);
	if (ret) {
	logger(-1, 0, "Failed to read %s", fname);
	ploop_free_diskdescriptor(di);
	return VZCTL_E_CONVERT_IMAGE;
	}
	ret = ploop_convert_image(di, mode, 0);
	if (ret) {
	logger(-1, 0, "Failed to convert image: %s [%d]",
	ploop_get_last_error(), ret);
	ret = VZCTL_E_CONVERT_IMAGE;
	}
	ploop_free_diskdescriptor(di);
	return ret;
	}

	int vzctl_resize_image(const char *ve_private, unsigned long long newsize)
	{
	int ret;
	struct ploop_disk_images_data *di;
	struct ploop_resize_param param;
	char fname[PATH_MAX];

	if (ve_private == NULL) {
	logger(-1, 0, "Failed to resize image: "
	"CT private is not specified");
	return VZCTL_E_RESIZE_IMAGE;
	}

	if (check_ploop_size(newsize) < 0)
	return VZ_DISKSPACE_NOT_SET;

	di = ploop_alloc_diskdescriptor();
	if (di == NULL)
	return VZ_RESOURCE_ERROR;
	GET_DISK_DESCRIPTOR(fname, ve_private);
	ret = ploop_read_diskdescriptor(fname, di);
	if (ret) {
	logger(-1, 0, "Failed to read %s", fname);
	ploop_free_diskdescriptor(di);
	return VZCTL_E_RESIZE_IMAGE;
	}
	param.size = newsize * 2; /* Kb to 512b sectors */
	ret = ploop_resize_image(di, &param);
	if (ret) {
	logger(-1, 0, "Failed to resize image: %s [%d]",
	ploop_get_last_error(), ret);
	ret = VZCTL_E_RESIZE_IMAGE;
	}
	ploop_free_diskdescriptor(di);
	return ret;
	}

	int vzctl_get_ploop_dev(const char mnt, char out, int len)
	{
	return ploop_get_partition_by_mnt(mnt, out, len);
	}

	int vzctl_create_snapshot(const char ve_private, const char guid)
	{
	char fname[PATH_MAX];
	struct ploop_disk_images_data *di;
	int ret;
	struct ploop_snapshot_param param = {};

	if (ve_private == NULL) {
	logger(-1, 0, "Failed to create snapshot: "
	"CT private is not specified");
	return VZ_VE_PRIVATE_NOTSET;
	}
	di = ploop_alloc_diskdescriptor();
	if (di == NULL)
	return VZ_RESOURCE_ERROR;
	GET_DISK_DESCRIPTOR(fname, ve_private);
	if (ploop_read_diskdescriptor(fname, di)) {
	logger(-1, 0, "Failed to read %s", fname);
	ploop_free_diskdescriptor(di);
	return VZCTL_E_CREATE_SNAPSHOT;
	}
	param.guid = strdup(guid);
	ret = ploop_create_snapshot(di, &param);
	free(param.guid);
	if (ret) {
	logger(-1, 0, "Failed to create snapshot: %s [%d]",
	ploop_get_last_error(), ret);
	ret = VZCTL_E_CREATE_SNAPSHOT;
	}
	ploop_free_diskdescriptor(di);

	return ret;
	}

	int vzctl_delete_snapshot(const char ve_private, const char guid)
	{
	char fname[PATH_MAX];
	struct ploop_disk_images_data *di;
	int ret;

	if (ve_private == NULL) {
	logger(-1, 0, "Failed to delete snapshot: "
	"CT private is not specified");
	return VZ_VE_PRIVATE_NOTSET;
	}
	di = ploop_alloc_diskdescriptor();
	if (di == NULL)
	return VZ_RESOURCE_ERROR;
	GET_DISK_DESCRIPTOR(fname, ve_private);
	if (ploop_read_diskdescriptor(fname, di)) {
	logger(-1, 0, "Failed to read %s", fname);
	ploop_free_diskdescriptor(di);
	return VZCTL_E_CREATE_SNAPSHOT;
	}
	ret = ploop_delete_snapshot(di, guid);
	if (ret) {
	logger(-1, 0, "Failed to delete snapshot: %s [%d]",
	ploop_get_last_error(), ret);
	ret = VZCTL_E_DELETE_SNAPSHOT;
	}
	ploop_free_diskdescriptor(di);

	return ret;
	}

	int vzctl_merge_snapshot(const char ve_private, const char guid)
	{
	char fname[PATH_MAX];
	struct ploop_disk_images_data *di;
	int ret;
	struct ploop_merge_param param = {};

	if (guid == NULL)
	return VZCTL_E_MERGE_SNAPSHOT;
	if (ve_private == NULL) {
	logger(-1, 0, "Failed to merge snapshot: "
	"CT private is not specified");
	return VZ_VE_PRIVATE_NOTSET;
	}
	di = ploop_alloc_diskdescriptor();
	if (di == NULL)
	return VZ_RESOURCE_ERROR;
	GET_DISK_DESCRIPTOR(fname, ve_private);
	ret = VZCTL_E_MERGE_SNAPSHOT;
	if (ploop_read_diskdescriptor(fname, di)) {
	logger(-1, 0, "Failed to read %s", fname);
	goto err;
	}
	param.guid = guid;
	ret = ploop_merge_snapshot(di, &param);
	if (ret) {
	logger(-1, 0, "Failed to merge snapshot %s: %s [%d]",
	guid, ploop_get_last_error(), ret);
	goto err;
	}
	err:
	ploop_free_diskdescriptor(di);

	return (ret = 0) ? 0: VZCTL_E_MERGE_SNAPSHOT;
	}

	int ve_private_is_ploop(const char *private)
	{
	char image[PATH_MAX];

	snprintf(image, sizeof(image), "%s/%s/root.hdd",
	private, VZCTL_VE_ROOTHDD_DIR);
	return stat_file(image);
	}

	int check_ploop_size(unsigned long size)
	{
	const unsigned long max_size = /* 2T - 2G - 1M, in Kb */
	(2ull << 30) - (2ull << 20) - (1 << 10);

	if (size < max_size)
	return 0;

	logger(-1, 0, "Error: diskspace is set too big for ploop: %lu KB "
	"(max size is %lu KB)", size, max_size - 1);
	return -1;

	}

	/* Convert a CT to ploop layout
	* 1) mount CT
	* 2) create & mount image
	* 3) cp VE_ROOT -> image
	* 4) update ve_layout
	*/
	int vzctl_env_convert_ploop(vps_handler *h, envid_t veid,
	fs_param fs, dq_param dq, int mode)
	{
	struct vzctl_create_image_param param = {};
	struct vzctl_mount_param mount_param = {};
	int ret, ret2;
	char cmd[STR_SIZE];
	char new_private[STR_SIZE];

	if (ve_private_is_ploop(fs->private)) {
	logger(0, 0, "CT is already on ploop");
	return 0;
	}
	if (!is_ploop_supported()) {
	logger(-1, 0, "No ploop support in the kernel");
	return VZ_BAD_KERNEL;
	}
	if (vps_is_run(h, veid)) {
	logger(-1, 0, "CT is running (stop it first)");
	return VZ_VE_RUNNING;
	}
	if (vps_is_mounted(fs->root)) {
	logger(-1, 0, "CT is mounted (umount it first)");
	return VZ_FS_MOUNTED;
	}
	if (!dq->diskspace \|\| dq->diskspace[1] <= 0) {
	logger(-1, 0, "Error: diskspace not set");
	return VZ_DISKSPACE_NOT_SET;
	}
	if (check_ploop_size(dq->diskspace[1]) < 0)
	return VZ_DISKSPACE_NOT_SET;

	snprintf(new_private, sizeof(new_private), "%s.ploop", fs->private);
	if (make_dir_mode(new_private, 1, 0600) != 0)
	return VZ_CANT_CREATE_DIR;

	param.mode = mode;
	param.size = dq->diskspace[1]; // limit
	ret = vzctl_create_image(new_private, &param);
	if (ret)
	goto err;

	mount_param.target = fs->root;

	ret = vzctl_mount_image(new_private, &mount_param);
	if (ret)
	goto err;

	logger(0, 0, "Copying content to ploop...");
	snprintf(cmd, sizeof(cmd), "/bin/cp -ax %s/. %s",
	fs->private, fs->root);
	logger(1, 0, "Executing %s", cmd);
	ret = system(cmd);
	ret2 = vzctl_umount_image(new_private);
	if (ret) {
	ret = VZ_SYSTEM_ERROR;
	goto err;
	}
	if (ret2) {
	/* Error message already printed by vzctl_umount_image() */
	ret = ret2;
	goto err;
	}
	/* Finally, del the old private and replace it with the new one */
	del_dir(fs->private);
	rename(new_private, fs->private);
	logger(0, 0, "Container was successfully converted "
	"to the ploop layout");
	err:
	if (ret != 0)
	del_dir(new_private);
	return ret;
	}