btrfs-progs/cmds-subvolume.c

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * 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 021110-1307, USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <sys/stat.h>
#include <libgen.h>
#include <limits.h>
#include <getopt.h>
#include <uuid/uuid.h>

#include "kerncompat.h"
#include "ioctl.h"
#include "qgroup.h"

#include "ctree.h"
#include "commands.h"
#include "utils.h"
#include "btrfs-list.h"
#include "utils.h"

static const char * const subvolume_cmd_group_usage[] = {
	"btrfs subvolume <command> <args>",
	NULL
};

/*
 * test if path is a directory
 * this function return
 * 0-> path exists but it is not a directory
 * 1-> path exists and it is  a directory
 * -1 -> path is unaccessible
 */
static int test_isdir(char *path)
{
	struct stat	st;
	int		res;

	res = stat(path, &st);
	if(res < 0 )
		return -1;

	return S_ISDIR(st.st_mode);
}

static const char * const cmd_subvol_create_usage[] = {
	"btrfs subvolume create [-i <qgroupid>] [<dest>/]<name>",
	"Create a subvolume",
	"Create a subvolume <name> in <dest>.  If <dest> is not given",
	"subvolume <name> will be created in the current directory.",
	"",
	"-i <qgroupid>  add the newly created subvolume to a qgroup. This",
	"               option can be given multiple times.",
	NULL
};

static int cmd_subvol_create(int argc, char **argv)
{
	int	retval, res, len;
	int	fddst = -1;
	char	*newname;
	char	*dstdir;
	char	*dst;
	struct btrfs_qgroup_inherit *inherit = NULL;
	DIR	*dirstream = NULL;

	optind = 1;
	while (1) {
		int c = getopt(argc, argv, "c:i:");
		if (c < 0)
			break;

		switch (c) {
		case 'c':
			res = qgroup_inherit_add_copy(&inherit, optarg, 0);
			if (res) {
				retval = res;
				goto out;
			}
			break;
		case 'i':
			res = qgroup_inherit_add_group(&inherit, optarg);
			if (res) {
				retval = res;
				goto out;
			}
			break;
		default:
			usage(cmd_subvol_create_usage);
		}
	}

	if (check_argc_exact(argc - optind, 1))
		usage(cmd_subvol_create_usage);

	dst = argv[optind];

	retval = 1;	/* failure */
	res = test_isdir(dst);
	if (res >= 0) {
		fprintf(stderr, "ERROR: '%s' exists\n", dst);
		goto out;
	}

	newname = strdup(dst);
	newname = basename(newname);
	dstdir = strdup(dst);
	dstdir = dirname(dstdir);

	if (!strcmp(newname, ".") || !strcmp(newname, "..") ||
	     strchr(newname, '/') ){
		fprintf(stderr, "ERROR: uncorrect subvolume name ('%s')\n",
			newname);
		goto out;
	}

	len = strlen(newname);
	if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
		fprintf(stderr, "ERROR: subvolume name too long ('%s)\n",
			newname);
		goto out;
	}

	fddst = open_file_or_dir(dstdir, &dirstream);
	if (fddst < 0) {
		fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
		goto out;
	}

	printf("Create subvolume '%s/%s'\n", dstdir, newname);
	if (inherit) {
		struct btrfs_ioctl_vol_args_v2	args;

		memset(&args, 0, sizeof(args));
		strncpy_null(args.name, newname);
		args.flags |= BTRFS_SUBVOL_QGROUP_INHERIT;
		args.size = qgroup_inherit_size(inherit);
		args.qgroup_inherit = inherit;

		res = ioctl(fddst, BTRFS_IOC_SUBVOL_CREATE_V2, &args);
	} else {
		struct btrfs_ioctl_vol_args	args;

		memset(&args, 0, sizeof(args));
		strncpy_null(args.name, newname);

		res = ioctl(fddst, BTRFS_IOC_SUBVOL_CREATE, &args);
	}

	if (res < 0) {
		fprintf(stderr, "ERROR: cannot create subvolume - %s\n",
			strerror(errno));
		goto out;
	}

	retval = 0;	/* success */
out:
	close_file_or_dir(fddst, dirstream);
	free(inherit);

	return retval;
}

/*
 * test if path is a subvolume:
 * this function return
 * 0-> path exists but it is not a subvolume
 * 1-> path exists and it is  a subvolume
 * -1 -> path is unaccessible
 */
int test_issubvolume(char *path)
{
	struct stat	st;
	int		res;

	res = stat(path, &st);
	if(res < 0 )
		return -1;

	return (st.st_ino == 256) && S_ISDIR(st.st_mode);
}

static const char * const cmd_subvol_delete_usage[] = {
	"btrfs subvolume delete <subvolume> [<subvolume>...]",
	"Delete subvolume(s)",
	NULL
};

static int cmd_subvol_delete(int argc, char **argv)
{
	int	res, fd, len, e, cnt = 1, ret = 0;
	struct btrfs_ioctl_vol_args	args;
	char	*dname, *vname, *cpath;
	char	*path;
	DIR	*dirstream = NULL;

	if (argc < 2)
		usage(cmd_subvol_delete_usage);

again:
	path = argv[cnt];

	res = test_issubvolume(path);
	if(res<0){
		fprintf(stderr, "ERROR: error accessing '%s'\n", path);
		ret = 12;
		goto out;
	}
	if(!res){
		fprintf(stderr, "ERROR: '%s' is not a subvolume\n", path);
		ret = 13;
		goto out;
	}

	cpath = realpath(path, 0);
	dname = strdup(cpath);
	dname = dirname(dname);
	vname = strdup(cpath);
	vname = basename(vname);
	free(cpath);

	if( !strcmp(vname,".") || !strcmp(vname,"..") ||
	     strchr(vname, '/') ){
		fprintf(stderr, "ERROR: incorrect subvolume name ('%s')\n",
			vname);
		ret = 14;
		goto out;
	}

	len = strlen(vname);
	if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
		fprintf(stderr, "ERROR: snapshot name too long ('%s)\n",
			vname);
		ret = 14;
		goto out;
	}

	fd = open_file_or_dir(dname, &dirstream);
	if (fd < 0) {
		fprintf(stderr, "ERROR: can't access to '%s'\n", dname);
		ret = 12;
		goto out;
	}

	printf("Delete subvolume '%s/%s'\n", dname, vname);
	strncpy_null(args.name, vname);
	res = ioctl(fd, BTRFS_IOC_SNAP_DESTROY, &args);
	e = errno;

	close_file_or_dir(fd, dirstream);

	if(res < 0 ){
		fprintf( stderr, "ERROR: cannot delete '%s/%s' - %s\n",
			dname, vname, strerror(e));
		ret = 11;
		goto out;
	}

out:
	cnt++;
	if (cnt < argc)
		goto again;

	return ret;
}

/*
 * Naming of options:
 * - uppercase for filters and sort options
 * - lowercase for enabling specific items in the output
 */
static const char * const cmd_subvol_list_usage[] = {
	"btrfs subvolume list [options] [-G [+|-]value] [-C [+|-]value] "
	"[--sort=gen,ogen,rootid,path] <path>",
	"List subvolumes (and snapshots)",
	"",
	"-p           print parent ID",
	"-a           print all the subvolumes in the filesystem and",
	"             distinguish absolute and relative path with respect",
	"             to the given <path>",
	"-c           print the ogeneration of the subvolume",
	"-g           print the generation of the subvolume",
	"-o           print only subvolumes bellow specified path",
	"-u           print the uuid of subvolumes (and snapshots)",
	"-q           print the parent uuid of the snapshots",
	"-t           print the result as a table",
	"-s           list snapshots only in the filesystem",
	"-r           list readonly subvolumes (including snapshots)",
	"-G [+|-]value",
	"             filter the subvolumes by generation",
	"             (+value: >= value; -value: <= value; value: = value)",
	"-C [+|-]value",
	"             filter the subvolumes by ogeneration",
	"             (+value: >= value; -value: <= value; value: = value)",
	"--sort=gen,ogen,rootid,path",
	"             list the subvolume in order of gen, ogen, rootid or path",
	"             you also can add '+' or '-' in front of each items.",
	"             (+:ascending, -:descending, ascending default)",
	NULL,
};

static int cmd_subvol_list(int argc, char **argv)
{
	struct btrfs_list_filter_set *filter_set;
	struct btrfs_list_comparer_set *comparer_set;
	u64 flags = 0;
	int fd = -1;
	u64 top_id;
	int ret = -1, uerr = 0;
	int c;
	char *subvol;
	int is_tab_result = 0;
	int is_list_all = 0;
	int is_only_in_path = 0;
	struct option long_options[] = {
		{"sort", 1, NULL, 'S'},
		{0, 0, 0, 0}
	};
	DIR *dirstream = NULL;

	filter_set = btrfs_list_alloc_filter_set();
	comparer_set = btrfs_list_alloc_comparer_set();

	optind = 1;
	while(1) {
		c = getopt_long(argc, argv,
				    "acgopqsurG:C:t", long_options, NULL);
		if (c < 0)
			break;

		switch(c) {
		case 'p':
			btrfs_list_setup_print_column(BTRFS_LIST_PARENT);
			break;
		case 'a':
			is_list_all = 1;
			break;
		case 'c':
			btrfs_list_setup_print_column(BTRFS_LIST_OGENERATION);
			break;
		case 'g':
			btrfs_list_setup_print_column(BTRFS_LIST_GENERATION);
			break;
		case 'o':
			is_only_in_path = 1;
			break;
		case 't':
			is_tab_result = 1;
			break;
		case 's':
			btrfs_list_setup_filter(&filter_set,
						BTRFS_LIST_FILTER_SNAPSHOT_ONLY,
						0);
			btrfs_list_setup_print_column(BTRFS_LIST_OGENERATION);
			btrfs_list_setup_print_column(BTRFS_LIST_OTIME);
			break;
		case 'u':
			btrfs_list_setup_print_column(BTRFS_LIST_UUID);
			break;
		case 'q':
			btrfs_list_setup_print_column(BTRFS_LIST_PUUID);
			break;
		case 'r':
			flags |= BTRFS_ROOT_SUBVOL_RDONLY;
			break;
		case 'G':
			btrfs_list_setup_print_column(BTRFS_LIST_GENERATION);
			ret = btrfs_list_parse_filter_string(optarg,
							&filter_set,
							BTRFS_LIST_FILTER_GEN);
			if (ret) {
				uerr = 1;
				goto out;
			}
			break;

		case 'C':
			btrfs_list_setup_print_column(BTRFS_LIST_OGENERATION);
			ret = btrfs_list_parse_filter_string(optarg,
							&filter_set,
							BTRFS_LIST_FILTER_CGEN);
			if (ret) {
				uerr = 1;
				goto out;
			}
			break;
		case 'S':
			ret = btrfs_list_parse_sort_string(optarg,
							   &comparer_set);
			if (ret) {
				uerr = 1;
				goto out;
			}
			break;

		default:
			uerr = 1;
			goto out;
		}
	}

	if (flags)
		btrfs_list_setup_filter(&filter_set, BTRFS_LIST_FILTER_FLAGS,
					flags);

	if (check_argc_exact(argc - optind, 1)) {
		uerr = 1;
		goto out;
	}

	subvol = argv[optind];
	fd = open_file_or_dir(subvol, &dirstream);
	if (fd < 0) {
		ret = -1;
		fprintf(stderr, "ERROR: can't access '%s'\n", subvol);
		goto out;
	}

	ret = btrfs_list_get_path_rootid(fd, &top_id);
	if (ret) {
		fprintf(stderr, "ERROR: can't get rootid for '%s'\n", subvol);
		goto out;
	}

	if (is_list_all)
		btrfs_list_setup_filter(&filter_set,
					BTRFS_LIST_FILTER_FULL_PATH,
					top_id);
	else if (is_only_in_path)
		btrfs_list_setup_filter(&filter_set,
					BTRFS_LIST_FILTER_TOPID_EQUAL,
					top_id);

	/* by default we shall print the following columns*/
	btrfs_list_setup_print_column(BTRFS_LIST_OBJECTID);
	btrfs_list_setup_print_column(BTRFS_LIST_GENERATION);
	btrfs_list_setup_print_column(BTRFS_LIST_TOP_LEVEL);
	btrfs_list_setup_print_column(BTRFS_LIST_PATH);

	if (is_tab_result)
		ret = btrfs_list_subvols_print(fd, filter_set, comparer_set,
				BTRFS_LIST_LAYOUT_TABLE,
				!is_list_all && !is_only_in_path, NULL);
	else
		ret = btrfs_list_subvols_print(fd, filter_set, comparer_set,
				BTRFS_LIST_LAYOUT_DEFAULT,
				!is_list_all && !is_only_in_path, NULL);

out:
	close_file_or_dir(fd, dirstream);
	if (filter_set)
		btrfs_list_free_filter_set(filter_set);
	if (comparer_set)
		btrfs_list_free_comparer_set(comparer_set);
	if (uerr)
		usage(cmd_subvol_list_usage);

	return ret;
}

static const char * const cmd_snapshot_usage[] = {
	"btrfs subvolume snapshot [-r] <source> <dest>|[<dest>/]<name>",
	"btrfs subvolume snapshot [-r] [-i <qgroupid>] <source> <dest>|[<dest>/]<name>",
	"Create a snapshot of the subvolume",
	"Create a writable/readonly snapshot of the subvolume <source> with",
	"the name <name> in the <dest> directory.  If only <dest> is given,",
	"the subvolume will be named the basename of <source>.",
	"",
	"-r             create a readonly snapshot",
	"-i <qgroupid>  add the newly created snapshot to a qgroup. This",
	"               option can be given multiple times.",
	NULL
};

static int cmd_snapshot(int argc, char **argv)
{
	char	*subvol, *dst;
	int	res, retval;
	int	fd = -1, fddst = -1;
	int	len, readonly = 0;
	char	*newname;
	char	*dstdir;
	struct btrfs_ioctl_vol_args_v2	args;
	struct btrfs_qgroup_inherit *inherit = NULL;
	DIR *dirstream1 = NULL, *dirstream2 = NULL;

	optind = 1;
	memset(&args, 0, sizeof(args));
	while (1) {
		int c = getopt(argc, argv, "c:i:r");
		if (c < 0)
			break;

		switch (c) {
		case 'c':
			res = qgroup_inherit_add_copy(&inherit, optarg, 0);
			if (res) {
				retval = res;
				goto out;
			}
			break;
		case 'i':
			res = qgroup_inherit_add_group(&inherit, optarg);
			if (res) {
				retval = res;
				goto out;
			}
			break;
		case 'r':
			readonly = 1;
			break;
		case 'x':
			res = qgroup_inherit_add_copy(&inherit, optarg, 1);
			if (res) {
				retval = res;
				goto out;
			}
			break;
		default:
			usage(cmd_snapshot_usage);
		}
	}

	if (check_argc_exact(argc - optind, 2))
		usage(cmd_snapshot_usage);

	subvol = argv[optind];
	dst = argv[optind + 1];

	retval = 1;	/* failure */
	res = test_issubvolume(subvol);
	if (res < 0) {
		fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
		goto out;
	}
	if (!res) {
		fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
		goto out;
	}

	res = test_isdir(dst);
	if (res == 0) {
		fprintf(stderr, "ERROR: '%s' exists and it is not a directory\n", dst);
		goto out;
	}

	if (res > 0) {
		newname = strdup(subvol);
		newname = basename(newname);
		dstdir = dst;
	} else {
		newname = strdup(dst);
		newname = basename(newname);
		dstdir = strdup(dst);
		dstdir = dirname(dstdir);
	}

	if (!strcmp(newname, ".") || !strcmp(newname, "..") ||
	     strchr(newname, '/') ){
		fprintf(stderr, "ERROR: incorrect snapshot name ('%s')\n",
			newname);
		goto out;
	}

	len = strlen(newname);
	if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
		fprintf(stderr, "ERROR: snapshot name too long ('%s)\n",
			newname);
		goto out;
	}

	fddst = open_file_or_dir(dstdir, &dirstream1);
	if (fddst < 0) {
		fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
		goto out;
	}

	fd = open_file_or_dir(subvol, &dirstream2);
	if (fd < 0) {
		fprintf(stderr, "ERROR: can't access to '%s'\n", dstdir);
		goto out;
	}

	if (readonly) {
		args.flags |= BTRFS_SUBVOL_RDONLY;
		printf("Create a readonly snapshot of '%s' in '%s/%s'\n",
		       subvol, dstdir, newname);
	} else {
		printf("Create a snapshot of '%s' in '%s/%s'\n",
		       subvol, dstdir, newname);
	}

	args.fd = fd;
	if (inherit) {
		args.flags |= BTRFS_SUBVOL_QGROUP_INHERIT;
		args.size = qgroup_inherit_size(inherit);
		args.qgroup_inherit = inherit;
	}
	strncpy_null(args.name, newname);

	res = ioctl(fddst, BTRFS_IOC_SNAP_CREATE_V2, &args);

	if (res < 0) {
		fprintf( stderr, "ERROR: cannot snapshot '%s' - %s\n",
			subvol, strerror(errno));
		goto out;
	}

	retval = 0;	/* success */

out:
	close_file_or_dir(fddst, dirstream1);
	close_file_or_dir(fd, dirstream2);
	free(inherit);

	return retval;
}

static const char * const cmd_subvol_get_default_usage[] = {
	"btrfs subvolume get-default <path>",
	"Get the default subvolume of a filesystem",
	NULL
};

static int cmd_subvol_get_default(int argc, char **argv)
{
	int fd = -1;
	int ret;
	char *subvol;
	struct btrfs_list_filter_set *filter_set;
	u64 default_id;
	DIR *dirstream = NULL;

	if (check_argc_exact(argc, 2))
		usage(cmd_subvol_get_default_usage);

	subvol = argv[1];
	fd = open_file_or_dir(subvol, &dirstream);
	if (fd < 0) {
		fprintf(stderr, "ERROR: can't access '%s'\n", subvol);
		return 1;
	}

	ret = btrfs_list_get_default_subvolume(fd, &default_id);
	if (ret) {
		fprintf(stderr, "ERROR: can't perform the search - %s\n",
			strerror(errno));
		goto out;
	}

	ret = 1;
	if (default_id == 0) {
		fprintf(stderr, "ERROR: 'default' dir item not found\n");
		goto out;
	}

	/* no need to resolve roots if FS_TREE is default */
	if (default_id == BTRFS_FS_TREE_OBJECTID) {
		printf("ID 5 (FS_TREE)\n");
		goto out;
	}

	filter_set = btrfs_list_alloc_filter_set();
	btrfs_list_setup_filter(&filter_set, BTRFS_LIST_FILTER_ROOTID,
				default_id);

	/* by default we shall print the following columns*/
	btrfs_list_setup_print_column(BTRFS_LIST_OBJECTID);
	btrfs_list_setup_print_column(BTRFS_LIST_GENERATION);
	btrfs_list_setup_print_column(BTRFS_LIST_TOP_LEVEL);
	btrfs_list_setup_print_column(BTRFS_LIST_PATH);

	ret = btrfs_list_subvols_print(fd, filter_set, NULL,
		BTRFS_LIST_LAYOUT_DEFAULT, 1, NULL);

	if (filter_set)
		btrfs_list_free_filter_set(filter_set);
out:
	close_file_or_dir(fd, dirstream);
	if (ret)
		return 1;
	return 0;
}

static const char * const cmd_subvol_set_default_usage[] = {
	"btrfs subvolume set-default <subvolid> <path>",
	"Set the default subvolume of a filesystem",
	NULL
};

static int cmd_subvol_set_default(int argc, char **argv)
{
	int	ret=0, fd, e;
	u64	objectid;
	char	*path;
	char	*subvolid;
	DIR	*dirstream = NULL;

	if (check_argc_exact(argc, 3))
		usage(cmd_subvol_set_default_usage);

	subvolid = argv[1];
	path = argv[2];

	objectid = (unsigned long long)strtoll(subvolid, NULL, 0);
	if (errno == ERANGE) {
		fprintf(stderr, "ERROR: invalid tree id (%s)\n", subvolid);
		return 1;
	}

	fd = open_file_or_dir(path, &dirstream);
	if (fd < 0) {
		fprintf(stderr, "ERROR: can't access to '%s'\n", path);
		return 1;
	}

	ret = ioctl(fd, BTRFS_IOC_DEFAULT_SUBVOL, &objectid);
	e = errno;
	close_file_or_dir(fd, dirstream);
	if (ret < 0) {
		fprintf(stderr, "ERROR: unable to set a new default subvolume - %s\n",
			strerror(e));
		return 1;
	}
	return 0;
}

static const char * const cmd_find_new_usage[] = {
	"btrfs subvolume find-new <path> <lastgen>",
	"List the recently modified files in a filesystem",
	NULL
};

static int cmd_find_new(int argc, char **argv)
{
	int fd;
	int ret;
	char *subvol;
	u64 last_gen;
	DIR *dirstream = NULL;

	if (check_argc_exact(argc, 3))
		usage(cmd_find_new_usage);

	subvol = argv[1];
	last_gen = atoll(argv[2]);

	ret = test_issubvolume(subvol);
	if (ret < 0) {
		fprintf(stderr, "ERROR: error accessing '%s'\n", subvol);
		return 12;
	}
	if (!ret) {
		fprintf(stderr, "ERROR: '%s' is not a subvolume\n", subvol);
		return 13;
	}

	fd = open_file_or_dir(subvol, &dirstream);
	if (fd < 0) {
		fprintf(stderr, "ERROR: can't access '%s'\n", subvol);
		return 12;
	}
	ret = btrfs_list_find_updated_files(fd, 0, last_gen);
	close_file_or_dir(fd, dirstream);
	if (ret)
		return 19;
	return 0;
}

static const char * const cmd_subvol_show_usage[] = {
	"btrfs subvolume show <subvol-path>",
	"Show more information of the subvolume",
	NULL
};

static int cmd_subvol_show(int argc, char **argv)
{
	struct root_info get_ri;
	struct btrfs_list_filter_set *filter_set;
	char tstr[256];
	char uuidparse[37];
	char *fullpath = NULL, *svpath = NULL, *mnt = NULL;
	char raw_prefix[] = "\t\t\t\t";
	u64 sv_id, mntid;
	int fd = -1, mntfd = -1;
	int ret = -1;
	DIR *dirstream1 = NULL, *dirstream2 = NULL;

	if (check_argc_exact(argc, 2))
		usage(cmd_subvol_show_usage);

	fullpath = realpath(argv[1], 0);
	if (!fullpath) {
		fprintf(stderr, "ERROR: finding real path for '%s', %s\n",
			argv[1], strerror(errno));
		goto out;
	}

	ret = test_issubvolume(fullpath);
	if (ret < 0) {
		fprintf(stderr, "ERROR: error accessing '%s'\n", fullpath);
		goto out;
	}
	if (!ret) {
		fprintf(stderr, "ERROR: '%s' is not a subvolume\n", fullpath);
		ret = -1;
		goto out;
	}

	ret = find_mount_root(fullpath, &mnt);
	if (ret < 0) {
		fprintf(stderr, "ERROR: find_mount_root failed on %s: "
				"%s\n", fullpath, strerror(-ret));
		goto out;
	}
	ret = -1;
	svpath = get_subvol_name(mnt, fullpath);

	fd = open_file_or_dir(fullpath, &dirstream1);
	if (fd < 0) {
		fprintf(stderr, "ERROR: can't access '%s'\n", fullpath);
		goto out;
	}

	ret = btrfs_list_get_path_rootid(fd, &sv_id);
	if (ret) {
		fprintf(stderr, "ERROR: can't get rootid for '%s'\n",
			fullpath);
		goto out;
	}

	mntfd = open_file_or_dir(mnt, &dirstream2);
	if (mntfd < 0) {
		fprintf(stderr, "ERROR: can't access '%s'\n", mnt);
		goto out;
	}

	ret = btrfs_list_get_path_rootid(mntfd, &mntid);
	if (ret) {
		fprintf(stderr, "ERROR: can't get rootid for '%s'\n", mnt);
		goto out;
	}

	if (sv_id == BTRFS_FS_TREE_OBJECTID) {
		printf("%s is btrfs root\n", fullpath);
		goto out;
	}

	memset(&get_ri, 0, sizeof(get_ri));
	get_ri.root_id = sv_id;

	if (btrfs_get_subvol(mntfd, &get_ri)) {
		fprintf(stderr, "ERROR: can't find '%s'\n",
			svpath);
		goto out;
	}

	ret = 0;
	/* print the info */
	printf("%s\n", fullpath);
	printf("\tName: \t\t\t%s\n", get_ri.name);

	if (uuid_is_null(get_ri.uuid))
		strcpy(uuidparse, "-");
	else
		uuid_unparse(get_ri.uuid, uuidparse);
	printf("\tuuid: \t\t\t%s\n", uuidparse);

	if (uuid_is_null(get_ri.puuid))
		strcpy(uuidparse, "-");
	else
		uuid_unparse(get_ri.puuid, uuidparse);
	printf("\tParent uuid: \t\t%s\n", uuidparse);

	if (get_ri.otime) {
		struct tm tm;

		localtime_r(&get_ri.otime, &tm);
		strftime(tstr, 256, "%Y-%m-%d %X", &tm);
	} else
		strcpy(tstr, "-");
	printf("\tCreation time: \t\t%s\n", tstr);

	printf("\tObject ID: \t\t%llu\n", get_ri.root_id);
	printf("\tGeneration (Gen): \t%llu\n", get_ri.gen);
	printf("\tGen at creation: \t%llu\n", get_ri.ogen);
	printf("\tParent: \t\t%llu\n", get_ri.ref_tree);
	printf("\tTop Level: \t\t%llu\n", get_ri.top_id);

	if (get_ri.flags & BTRFS_ROOT_SUBVOL_RDONLY)
		printf("\tFlags: \t\t\treadonly\n");
	else
		printf("\tFlags: \t\t\t-\n");

	/* print the snapshots of the given subvol if any*/
	printf("\tSnapshot(s):\n");
	filter_set = btrfs_list_alloc_filter_set();
	btrfs_list_setup_filter(&filter_set, BTRFS_LIST_FILTER_BY_PARENT,
				(u64)(unsigned long)get_ri.uuid);
	btrfs_list_setup_print_column(BTRFS_LIST_PATH);
	btrfs_list_subvols_print(fd, filter_set, NULL, BTRFS_LIST_LAYOUT_RAW,
			1, raw_prefix);

	/* clean up */
	if (get_ri.path)
		free(get_ri.path);
	if (get_ri.name)
		free(get_ri.name);
	if (get_ri.full_path)
		free(get_ri.full_path);
	if (filter_set)
		btrfs_list_free_filter_set(filter_set);

out:
	close_file_or_dir(fd, dirstream1);
	close_file_or_dir(mntfd, dirstream2);
	if (mnt)
		free(mnt);
	if (fullpath)
		free(fullpath);

	return ret;
}

const struct cmd_group subvolume_cmd_group = {
	subvolume_cmd_group_usage, NULL, {
		{ "create", cmd_subvol_create, cmd_subvol_create_usage, NULL, 0 },
		{ "delete", cmd_subvol_delete, cmd_subvol_delete_usage, NULL, 0 },
		{ "list", cmd_subvol_list, cmd_subvol_list_usage, NULL, 0 },
		{ "snapshot", cmd_snapshot, cmd_snapshot_usage, NULL, 0 },
		{ "get-default", cmd_subvol_get_default,
			cmd_subvol_get_default_usage, NULL, 0 },
		{ "set-default", cmd_subvol_set_default,
			cmd_subvol_set_default_usage, NULL, 0 },
		{ "find-new", cmd_find_new, cmd_find_new_usage, NULL, 0 },
		{ "show", cmd_subvol_show, cmd_subvol_show_usage, NULL, 0 },
		{ 0, 0, 0, 0, 0 }
	}
};

int cmd_subvolume(int argc, char **argv)
{
	return handle_command_group(&subvolume_cmd_group, argc, argv);
}