Imported Upstream version 4.6.1

1 files changed, 1308 insertions, 0 deletions

diff --git a/cmds-filesystem.c b/cmds-filesystem.c
new file mode 100644
index 00000000..9392a30b
--- /dev/null
+++ b/cmds-filesystem.c
@@ -0,0 +1,1308 @@
+/*
+ * 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 <uuid/uuid.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <ftw.h>
+#include <mntent.h>
+#include <linux/limits.h>
+#include <getopt.h>
+
+#include "kerncompat.h"
+#include "ctree.h"
+#include "ioctl.h"
+#include "utils.h"
+#include "volumes.h"
+#include "commands.h"
+#include "cmds-fi-usage.h"
+#include "list_sort.h"
+#include "disk-io.h"
+#include "cmds-fi-du.h"
+
+/*
+ * for btrfs fi show, we maintain a hash of fsids we've already printed.
+ * This way we don't print dups if a given FS is mounted more than once.
+ */
+#define SEEN_FSID_HASH_SIZE 256
+
+struct seen_fsid {
+	u8 fsid[BTRFS_FSID_SIZE];
+	struct seen_fsid *next;
+};
+
+static struct seen_fsid *seen_fsid_hash[SEEN_FSID_HASH_SIZE] = {NULL,};
+
+static int is_seen_fsid(u8 *fsid)
+{
+	u8 hash = fsid[0];
+	int slot = hash % SEEN_FSID_HASH_SIZE;
+	struct seen_fsid *seen = seen_fsid_hash[slot];
+
+	while (seen) {
+		if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
+			return 1;
+
+		seen = seen->next;
+	}
+
+	return 0;
+}
+
+static int add_seen_fsid(u8 *fsid)
+{
+	u8 hash = fsid[0];
+	int slot = hash % SEEN_FSID_HASH_SIZE;
+	struct seen_fsid *seen = seen_fsid_hash[slot];
+	struct seen_fsid *alloc;
+
+	if (!seen)
+		goto insert;
+
+	while (1) {
+		if (memcmp(seen->fsid, fsid, BTRFS_FSID_SIZE) == 0)
+			return -EEXIST;
+
+		if (!seen->next)
+			break;
+
+		seen = seen->next;
+	}
+
+insert:
+
+	alloc = malloc(sizeof(*alloc));
+	if (!alloc)
+		return -ENOMEM;
+
+	alloc->next = NULL;
+	memcpy(alloc->fsid, fsid, BTRFS_FSID_SIZE);
+
+	if (seen)
+		seen->next = alloc;
+	else
+		seen_fsid_hash[slot] = alloc;
+
+	return 0;
+}
+
+static void free_seen_fsid(void)
+{
+	int slot;
+	struct seen_fsid *seen;
+	struct seen_fsid *next;
+
+	for (slot = 0; slot < SEEN_FSID_HASH_SIZE; slot++) {
+		seen = seen_fsid_hash[slot];
+		while (seen) {
+			next = seen->next;
+			free(seen);
+			seen = next;
+		}
+		seen_fsid_hash[slot] = NULL;
+	}
+}
+
+static const char * const filesystem_cmd_group_usage[] = {
+	"btrfs filesystem [<group>] <command> [<args>]",
+	NULL
+};
+
+static const char * const cmd_filesystem_df_usage[] = {
+	"btrfs filesystem df [options] <path>",
+	"Show space usage information for a mount point",
+	HELPINFO_UNITS_SHORT_LONG,
+	NULL
+};
+
+static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
+{
+	u64 count = 0;
+	int ret;
+	struct btrfs_ioctl_space_args *sargs;
+
+	sargs = malloc(sizeof(struct btrfs_ioctl_space_args));
+	if (!sargs)
+		return -ENOMEM;
+
+	sargs->space_slots = 0;
+	sargs->total_spaces = 0;
+
+	ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
+	if (ret < 0) {
+		error("cannot get space info: %s\n", strerror(errno));
+		free(sargs);
+		return -errno;
+	}
+	/* This really should never happen */
+	if (!sargs->total_spaces) {
+		free(sargs);
+		return -ENOENT;
+	}
+	count = sargs->total_spaces;
+	free(sargs);
+
+	sargs = malloc(sizeof(struct btrfs_ioctl_space_args) +
+			(count * sizeof(struct btrfs_ioctl_space_info)));
+	if (!sargs)
+		return -ENOMEM;
+
+	sargs->space_slots = count;
+	sargs->total_spaces = 0;
+	ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
+	if (ret < 0) {
+		error("cannot get space info with %llu slots: %s",
+				count, strerror(errno));
+		free(sargs);
+		return -errno;
+	}
+	*sargs_ret = sargs;
+	return 0;
+}
+
+static void print_df(struct btrfs_ioctl_space_args *sargs, unsigned unit_mode)
+{
+	u64 i;
+	struct btrfs_ioctl_space_info *sp = sargs->spaces;
+
+	for (i = 0; i < sargs->total_spaces; i++, sp++) {
+		printf("%s, %s: total=%s, used=%s\n",
+			btrfs_group_type_str(sp->flags),
+			btrfs_group_profile_str(sp->flags),
+			pretty_size_mode(sp->total_bytes, unit_mode),
+			pretty_size_mode(sp->used_bytes, unit_mode));
+	}
+}
+
+static int cmd_filesystem_df(int argc, char **argv)
+{
+	struct btrfs_ioctl_space_args *sargs = NULL;
+	int ret;
+	int fd;
+	char *path;
+	DIR *dirstream = NULL;
+	unsigned unit_mode;
+
+	unit_mode = get_unit_mode_from_arg(&argc, argv, 1);
+
+	clean_args_no_options(argc, argv, cmd_filesystem_df_usage);
+
+	if (check_argc_exact(argc - optind, 1))
+		usage(cmd_filesystem_df_usage);
+
+	path = argv[optind];
+
+	fd = btrfs_open_dir(path, &dirstream, 1);
+	if (fd < 0)
+		return 1;
+
+	ret = get_df(fd, &sargs);
+
+	if (ret == 0) {
+		print_df(sargs, unit_mode);
+		free(sargs);
+	} else {
+		error("get_df failed %s", strerror(-ret));
+	}
+
+	close_file_or_dir(fd, dirstream);
+	return !!ret;
+}
+
+static int match_search_item_kernel(__u8 *fsid, char *mnt, char *label,
+					char *search)
+{
+	char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
+	int search_len = strlen(search);
+
+	search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
+	uuid_unparse(fsid, uuidbuf);
+	if (!strncmp(uuidbuf, search, search_len))
+		return 1;
+
+	if (*label && strcmp(label, search) == 0)
+		return 1;
+
+	if (strcmp(mnt, search) == 0)
+		return 1;
+
+	return 0;
+}
+
+static int uuid_search(struct btrfs_fs_devices *fs_devices, char *search)
+{
+	char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
+	struct list_head *cur;
+	struct btrfs_device *device;
+	int search_len = strlen(search);
+
+	search_len = min(search_len, BTRFS_UUID_UNPARSED_SIZE);
+	uuid_unparse(fs_devices->fsid, uuidbuf);
+	if (!strncmp(uuidbuf, search, search_len))
+		return 1;
+
+	list_for_each(cur, &fs_devices->devices) {
+		device = list_entry(cur, struct btrfs_device, dev_list);
+		if ((device->label && strcmp(device->label, search) == 0) ||
+		    strcmp(device->name, search) == 0)
+			return 1;
+	}
+	return 0;
+}
+
+/*
+ * Sort devices by devid, ascending
+ */
+static int cmp_device_id(void *priv, struct list_head *a,
+		struct list_head *b)
+{
+	const struct btrfs_device *da = list_entry(a, struct btrfs_device,
+			dev_list);
+	const struct btrfs_device *db = list_entry(b, struct btrfs_device,
+			dev_list);
+
+	return da->devid < db->devid ? -1 :
+		da->devid > db->devid ? 1 : 0;
+}
+
+static void splice_device_list(struct list_head *seed_devices,
+			       struct list_head *all_devices)
+{
+	struct btrfs_device *in_all, *next_all;
+	struct btrfs_device *in_seed, *next_seed;
+
+	list_for_each_entry_safe(in_all, next_all, all_devices, dev_list) {
+		list_for_each_entry_safe(in_seed, next_seed, seed_devices,
+								dev_list) {
+			if (in_all->devid == in_seed->devid) {
+				/*
+				 * When do dev replace in a sprout fs
+				 * to a dev in its seed fs, the replacing
+				 * dev will reside in the sprout fs and
+				 * the replaced dev will still exist
+				 * in the seed fs.
+				 * So pick the latest one when showing
+				 * the sprout fs.
+				 */
+				if (in_all->generation
+						< in_seed->generation) {
+					list_del(&in_all->dev_list);
+					free(in_all);
+				} else if (in_all->generation
+						> in_seed->generation) {
+					list_del(&in_seed->dev_list);
+					free(in_seed);
+				}
+				break;
+			}
+		}
+	}
+
+	list_splice(seed_devices, all_devices);
+}
+
+static void print_devices(struct btrfs_fs_devices *fs_devices,
+			  u64 *devs_found, unsigned unit_mode)
+{
+	struct btrfs_device *device;
+	struct btrfs_fs_devices *cur_fs;
+	struct list_head *all_devices;
+
+	all_devices = &fs_devices->devices;
+	cur_fs = fs_devices->seed;
+	/* add all devices of seed fs to the fs to be printed */
+	while (cur_fs) {
+		splice_device_list(&cur_fs->devices, all_devices);
+		cur_fs = cur_fs->seed;
+	}
+
+	list_sort(NULL, all_devices, cmp_device_id);
+	list_for_each_entry(device, all_devices, dev_list) {
+		printf("\tdevid %4llu size %s used %s path %s\n",
+		       (unsigned long long)device->devid,
+		       pretty_size_mode(device->total_bytes, unit_mode),
+		       pretty_size_mode(device->bytes_used, unit_mode),
+		       device->name);
+
+		(*devs_found)++;
+	}
+}
+
+static void print_one_uuid(struct btrfs_fs_devices *fs_devices,
+			   unsigned unit_mode)
+{
+	char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
+	struct btrfs_device *device;
+	u64 devs_found = 0;
+	u64 total;
+
+	if (add_seen_fsid(fs_devices->fsid))
+		return;
+
+	uuid_unparse(fs_devices->fsid, uuidbuf);
+	device = list_entry(fs_devices->devices.next, struct btrfs_device,
+			    dev_list);
+	if (device->label && device->label[0])
+		printf("Label: '%s' ", device->label);
+	else
+		printf("Label: none ");
+
+	total = device->total_devs;
+	printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
+	       (unsigned long long)total,
+	       pretty_size_mode(device->super_bytes_used, unit_mode));
+
+	print_devices(fs_devices, &devs_found, unit_mode);
+
+	if (devs_found < total) {
+		printf("\t*** Some devices missing\n");
+	}
+	printf("\n");
+}
+
+/* adds up all the used spaces as reported by the space info ioctl
+ */
+static u64 calc_used_bytes(struct btrfs_ioctl_space_args *si)
+{
+	u64 ret = 0;
+	int i;
+	for (i = 0; i < si->total_spaces; i++)
+		ret += si->spaces[i].used_bytes;
+	return ret;
+}
+
+static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
+		struct btrfs_ioctl_dev_info_args *dev_info,
+		struct btrfs_ioctl_space_args *space_info,
+		char *label, unsigned unit_mode)
+{
+	int i;
+	int fd;
+	int missing = 0;
+	char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
+	struct btrfs_ioctl_dev_info_args *tmp_dev_info;
+	int ret;
+
+	ret = add_seen_fsid(fs_info->fsid);
+	if (ret == -EEXIST)
+		return 0;
+	else if (ret)
+		return ret;
+
+	uuid_unparse(fs_info->fsid, uuidbuf);
+	if (label && *label)
+		printf("Label: '%s' ", label);
+	else
+		printf("Label: none ");
+
+	printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
+			fs_info->num_devices,
+			pretty_size_mode(calc_used_bytes(space_info),
+					 unit_mode));
+
+	for (i = 0; i < fs_info->num_devices; i++) {
+		char *canonical_path;
+
+		tmp_dev_info = (struct btrfs_ioctl_dev_info_args *)&dev_info[i];
+
+		/* Add check for missing devices even mounted */
+		fd = open((char *)tmp_dev_info->path, O_RDONLY);
+		if (fd < 0) {
+			missing = 1;
+			continue;
+		}
+		close(fd);
+		canonical_path = canonicalize_path((char *)tmp_dev_info->path);
+		printf("\tdevid %4llu size %s used %s path %s\n",
+			tmp_dev_info->devid,
+			pretty_size_mode(tmp_dev_info->total_bytes, unit_mode),
+			pretty_size_mode(tmp_dev_info->bytes_used, unit_mode),
+			canonical_path);
+
+		free(canonical_path);
+	}
+
+	if (missing)
+		printf("\t*** Some devices missing\n");
+	printf("\n");
+	return 0;
+}
+
+static int btrfs_scan_kernel(void *search, unsigned unit_mode)
+{
+	int ret = 0, fd;
+	int found = 0;
+	FILE *f;
+	struct mntent *mnt;
+	struct btrfs_ioctl_fs_info_args fs_info_arg;
+	struct btrfs_ioctl_dev_info_args *dev_info_arg = NULL;
+	struct btrfs_ioctl_space_args *space_info_arg = NULL;
+	char label[BTRFS_LABEL_SIZE];
+
+	f = setmntent("/proc/self/mounts", "r");
+	if (f == NULL)
+		return 1;
+
+	memset(label, 0, sizeof(label));
+	while ((mnt = getmntent(f)) != NULL) {
+		free(dev_info_arg);
+		dev_info_arg = NULL;
+		if (strcmp(mnt->mnt_type, "btrfs"))
+			continue;
+		ret = get_fs_info(mnt->mnt_dir, &fs_info_arg,
+				&dev_info_arg);
+		if (ret)
+			goto out;
+
+		/* skip all fs already shown as mounted fs */
+		if (is_seen_fsid(fs_info_arg.fsid))
+			continue;
+
+		ret = get_label_mounted(mnt->mnt_dir, label);
+		/* provide backward kernel compatibility */
+		if (ret == -ENOTTY)
+			ret = get_label_unmounted(
+				(const char *)dev_info_arg->path, label);
+
+		if (ret)
+			goto out;
+
+		if (search && !match_search_item_kernel(fs_info_arg.fsid,
+					mnt->mnt_dir, label, search)) {
+			continue;
+		}
+
+		fd = open(mnt->mnt_dir, O_RDONLY);
+		if ((fd != -1) && !get_df(fd, &space_info_arg)) {
+			print_one_fs(&fs_info_arg, dev_info_arg,
+				     space_info_arg, label, unit_mode);
+			kfree(space_info_arg);
+			memset(label, 0, sizeof(label));
+			found = 1;
+		}
+		if (fd != -1)
+			close(fd);
+	}
+
+out:
+	free(dev_info_arg);
+	endmntent(f);
+	return !found;
+}
+
+static int dev_to_fsid(char *dev, __u8 *fsid)
+{
+	struct btrfs_super_block *disk_super;
+	char buf[BTRFS_SUPER_INFO_SIZE];
+	int ret;
+	int fd;
+
+	fd = open(dev, O_RDONLY);
+	if (fd < 0) {
+		ret = -errno;
+		return ret;
+	}
+
+	disk_super = (struct btrfs_super_block *)buf;
+	ret = btrfs_read_dev_super(fd, disk_super,
+				   BTRFS_SUPER_INFO_OFFSET, 0);
+	if (ret)
+		goto out;
+
+	memcpy(fsid, disk_super->fsid, BTRFS_FSID_SIZE);
+	ret = 0;
+
+out:
+	close(fd);
+	return ret;
+}
+
+static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
+{
+	struct btrfs_fs_devices *cur_seed, *next_seed;
+	struct btrfs_device *device;
+
+	while (!list_empty(&fs_devices->devices)) {
+		device = list_entry(fs_devices->devices.next,
+					struct btrfs_device, dev_list);
+		list_del(&device->dev_list);
+
+		free(device->name);
+		free(device->label);
+		free(device);
+	}
+
+	/* free seed fs chain */
+	cur_seed = fs_devices->seed;
+	fs_devices->seed = NULL;
+	while (cur_seed) {
+		next_seed = cur_seed->seed;
+		free(cur_seed);
+
+		cur_seed = next_seed;
+	}
+
+	list_del(&fs_devices->list);
+	free(fs_devices);
+}
+
+static int copy_device(struct btrfs_device *dst,
+		       struct btrfs_device *src)
+{
+	dst->devid = src->devid;
+	memcpy(dst->uuid, src->uuid, BTRFS_UUID_SIZE);
+	if (src->name == NULL)
+		dst->name = NULL;
+	else {
+		dst->name = strdup(src->name);
+		if (!dst->name)
+			return -ENOMEM;
+	}
+	if (src->label == NULL)
+		dst->label = NULL;
+	else {
+		dst->label = strdup(src->label);
+		if (!dst->label) {
+			free(dst->name);
+			return -ENOMEM;
+		}
+	}
+	dst->total_devs = src->total_devs;
+	dst->super_bytes_used = src->super_bytes_used;
+	dst->total_bytes = src->total_bytes;
+	dst->bytes_used = src->bytes_used;
+	dst->generation = src->generation;
+
+	return 0;
+}
+
+static int copy_fs_devices(struct btrfs_fs_devices *dst,
+			   struct btrfs_fs_devices *src)
+{
+	struct btrfs_device *cur_dev, *dev_copy;
+	int ret = 0;
+
+	memcpy(dst->fsid, src->fsid, BTRFS_FSID_SIZE);
+	INIT_LIST_HEAD(&dst->devices);
+	dst->seed = NULL;
+
+	list_for_each_entry(cur_dev, &src->devices, dev_list) {
+		dev_copy = malloc(sizeof(*dev_copy));
+		if (!dev_copy) {
+			ret = -ENOMEM;
+			break;
+		}
+
+		ret = copy_device(dev_copy, cur_dev);
+		if (ret) {
+			free(dev_copy);
+			break;
+		}
+
+		list_add(&dev_copy->dev_list, &dst->devices);
+		dev_copy->fs_devices = dst;
+	}
+
+	return ret;
+}
+
+static int find_and_copy_seed(struct btrfs_fs_devices *seed,
+			      struct btrfs_fs_devices *copy,
+			      struct list_head *fs_uuids) {
+	struct btrfs_fs_devices *cur_fs;
+
+	list_for_each_entry(cur_fs, fs_uuids, list)
+		if (!memcmp(seed->fsid, cur_fs->fsid, BTRFS_FSID_SIZE))
+			return copy_fs_devices(copy, cur_fs);
+
+	return 1;
+}
+
+static int has_seed_devices(struct btrfs_fs_devices *fs_devices)
+{
+	struct btrfs_device *device;
+	int dev_cnt_total, dev_cnt = 0;
+
+	device = list_first_entry(&fs_devices->devices, struct btrfs_device,
+				  dev_list);
+
+	dev_cnt_total = device->total_devs;
+
+	list_for_each_entry(device, &fs_devices->devices, dev_list)
+		dev_cnt++;
+
+	return dev_cnt_total != dev_cnt;
+}
+
+static int search_umounted_fs_uuids(struct list_head *all_uuids,
+				    char *search, int *found)
+{
+	struct btrfs_fs_devices *cur_fs, *fs_copy;
+	struct list_head *fs_uuids;
+	int ret = 0;
+
+	fs_uuids = btrfs_scanned_uuids();
+
+	/*
+	 * The fs_uuids list is global, and open_ctree_* will
+	 * modify it, make a private copy here
+	 */
+	list_for_each_entry(cur_fs, fs_uuids, list) {
+		/* don't bother handle all fs, if search target specified */
+		if (search) {
+			if (uuid_search(cur_fs, search) == 0)
+				continue;
+			if (found)
+				*found = 1;
+		}
+
+		/* skip all fs already shown as mounted fs */
+		if (is_seen_fsid(cur_fs->fsid))
+			continue;
+
+		fs_copy = calloc(1, sizeof(*fs_copy));
+		if (!fs_copy) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		ret = copy_fs_devices(fs_copy, cur_fs);
+		if (ret) {
+			free(fs_copy);
+			goto out;
+		}
+
+		list_add(&fs_copy->list, all_uuids);
+	}
+
+out:
+	return ret;
+}
+
+static int map_seed_devices(struct list_head *all_uuids)
+{
+	struct btrfs_fs_devices *cur_fs, *cur_seed;
+	struct btrfs_fs_devices *seed_copy;
+	struct btrfs_fs_devices *opened_fs;
+	struct btrfs_device *device;
+	struct btrfs_fs_info *fs_info;
+	struct list_head *fs_uuids;
+	int ret = 0;
+
+	fs_uuids = btrfs_scanned_uuids();
+
+	list_for_each_entry(cur_fs, all_uuids, list) {
+		device = list_first_entry(&cur_fs->devices,
+						struct btrfs_device, dev_list);
+		if (!device)
+			continue;
+
+		/* skip fs without seeds */
+		if (!has_seed_devices(cur_fs))
+			continue;
+
+		/*
+		 * open_ctree_* detects seed/sprout mapping
+		 */
+		fs_info = open_ctree_fs_info(device->name, 0, 0, 0,
+						OPEN_CTREE_PARTIAL);
+		if (!fs_info)
+			continue;
+
+		/*
+		 * copy the seed chain under the opened fs
+		 */
+		opened_fs = fs_info->fs_devices;
+		cur_seed = cur_fs;
+		while (opened_fs->seed) {
+			seed_copy = malloc(sizeof(*seed_copy));
+			if (!seed_copy) {
+				ret = -ENOMEM;
+				goto fail_out;
+			}
+			ret = find_and_copy_seed(opened_fs->seed, seed_copy,
+						 fs_uuids);
+			if (ret) {
+				free(seed_copy);
+				goto fail_out;
+			}
+
+			cur_seed->seed = seed_copy;
+
+			opened_fs = opened_fs->seed;
+			cur_seed = cur_seed->seed;
+		}
+
+		close_ctree(fs_info->chunk_root);
+	}
+
+out:
+	return ret;
+fail_out:
+	close_ctree(fs_info->chunk_root);
+	goto out;
+}
+
+static const char * const cmd_filesystem_show_usage[] = {
+	"btrfs filesystem show [options] [<path>|<uuid>|<device>|label]",
+	"Show the structure of a filesystem",
+	"-d|--all-devices   show only disks under /dev containing btrfs filesystem",
+	"-m|--mounted       show only mounted btrfs",
+	HELPINFO_UNITS_LONG,
+	"If no argument is given, structure of all present filesystems is shown.",
+	NULL
+};
+
+static int cmd_filesystem_show(int argc, char **argv)
+{
+	LIST_HEAD(all_uuids);
+	struct btrfs_fs_devices *fs_devices;
+	char *search = NULL;
+	int ret;
+	/* default, search both kernel and udev */
+	int where = -1;
+	int type = 0;
+	char mp[PATH_MAX];
+	char path[PATH_MAX];
+	__u8 fsid[BTRFS_FSID_SIZE];
+	char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
+	unsigned unit_mode;
+	int found = 0;
+
+	unit_mode = get_unit_mode_from_arg(&argc, argv, 0);
+
+	while (1) {
+		int c;
+		static const struct option long_options[] = {
+			{ "all-devices", no_argument, NULL, 'd'},
+			{ "mounted", no_argument, NULL, 'm'},
+			{ NULL, 0, NULL, 0 }
+		};
+
+		c = getopt_long(argc, argv, "dm", long_options, NULL);
+		if (c < 0)
+			break;
+		switch (c) {
+		case 'd':
+			where = BTRFS_SCAN_LBLKID;
+			break;
+		case 'm':
+			where = BTRFS_SCAN_MOUNTED;
+			break;
+		default:
+			usage(cmd_filesystem_show_usage);
+		}
+	}
+
+	if (check_argc_max(argc, optind + 1))
+		usage(cmd_filesystem_show_usage);
+
+	if (argc > optind) {
+		search = argv[optind];
+		if (*search == 0)
+			usage(cmd_filesystem_show_usage);
+		type = check_arg_type(search);
+
+		/*
+		 * For search is a device:
+		 *     realpath do /dev/mapper/XX => /dev/dm-X
+		 *     which is required by BTRFS_SCAN_DEV
+		 * For search is a mountpoint:
+		 *     realpath do  /mnt/btrfs/  => /mnt/btrfs
+		 *     which shall be recognized by btrfs_scan_kernel()
+		 */
+		if (realpath(search, path))
+			search = path;
+
+		/*
+		 * Needs special handling if input arg is block dev And if
+		 * input arg is mount-point just print it right away
+		 */
+		if (type == BTRFS_ARG_BLKDEV && where != BTRFS_SCAN_LBLKID) {
+			ret = get_btrfs_mount(search, mp, sizeof(mp));
+			if (!ret) {
+				/* given block dev is mounted */
+				search = mp;
+				type = BTRFS_ARG_MNTPOINT;
+			} else {
+				ret = dev_to_fsid(search, fsid);
+				if (ret) {
+					error("no btrfs on %s", search);
+					return 1;
+				}
+				uuid_unparse(fsid, uuid_buf);
+				search = uuid_buf;
+				type = BTRFS_ARG_UUID;
+				goto devs_only;
+			}
+		}
+	}
+
+	if (where == BTRFS_SCAN_LBLKID)
+		goto devs_only;
+
+	/* show mounted btrfs */
+	ret = btrfs_scan_kernel(search, unit_mode);
+	if (search && !ret) {
+		/* since search is found we are done */
+		goto out;
+	}
+
+	/* shows mounted only */
+	if (where == BTRFS_SCAN_MOUNTED)
+		goto out;
+
+devs_only:
+	ret = btrfs_scan_lblkid();
+
+	if (ret) {
+		error("blkid device scan returned %d\n", ret);
+		return 1;
+	}
+
+	ret = search_umounted_fs_uuids(&all_uuids, search, &found);
+	if (ret < 0) {
+		error("searching target device returned error %d", ret);
+		return 1;
+	}
+
+	/*
+	 * The seed/sprout mapping are not detected yet,
+	 * do mapping build for all umounted fs
+	 */
+	ret = map_seed_devices(&all_uuids);
+	if (ret) {
+		error("mapping seed devices returned error %d", ret);
+		return 1;
+	}
+
+	list_for_each_entry(fs_devices, &all_uuids, list)
+		print_one_uuid(fs_devices, unit_mode);
+
+	if (search && !found) {
+		error("not a valid btrfs filesystem: %s", search);
+		ret = 1;
+	}
+	while (!list_empty(&all_uuids)) {
+		fs_devices = list_entry(all_uuids.next,
+					struct btrfs_fs_devices, list);
+		free_fs_devices(fs_devices);
+	}
+out:
+	free_seen_fsid();
+	return ret;
+}
+
+static const char * const cmd_filesystem_sync_usage[] = {
+	"btrfs filesystem sync <path>",
+	"Force a sync on a filesystem",
+	NULL
+};
+
+static int cmd_filesystem_sync(int argc, char **argv)
+{
+	int 	fd, res, e;
+	char	*path;
+	DIR	*dirstream = NULL;
+
+	clean_args_no_options(argc, argv, cmd_filesystem_sync_usage);
+
+	if (check_argc_exact(argc - optind, 1))
+		usage(cmd_filesystem_sync_usage);
+
+	path = argv[optind];
+
+	fd = btrfs_open_dir(path, &dirstream, 1);
+	if (fd < 0)
+		return 1;
+
+	res = ioctl(fd, BTRFS_IOC_SYNC);
+	e = errno;
+	close_file_or_dir(fd, dirstream);
+	if( res < 0 ){
+		error("sync ioctl failed on '%s': %s", path, strerror(e));
+		return 1;
+	}
+
+	return 0;
+}
+
+static int parse_compress_type(char *s)
+{
+	if (strcmp(optarg, "zlib") == 0)
+		return BTRFS_COMPRESS_ZLIB;
+	else if (strcmp(optarg, "lzo") == 0)
+		return BTRFS_COMPRESS_LZO;
+	else {
+		error("unknown compression type %s", s);
+		exit(1);
+	};
+}
+
+static const char * const cmd_filesystem_defrag_usage[] = {
+	"btrfs filesystem defragment [options] <file>|<dir> [<file>|<dir>...]",
+	"Defragment a file or a directory",
+	"",
+	"-v             be verbose",
+	"-r             defragment files recursively",
+	"-c[zlib,lzo]   compress the file while defragmenting",
+	"-f             flush data to disk immediately after defragmenting",
+	"-s start       defragment only from byte onward",
+	"-l len         defragment only up to len bytes",
+	"-t size        target extent size hint",
+	NULL
+};
+
+static int do_defrag(int fd, int fancy_ioctl,
+		struct btrfs_ioctl_defrag_range_args *range)
+{
+	int ret;
+
+	if (!fancy_ioctl)
+		ret = ioctl(fd, BTRFS_IOC_DEFRAG, NULL);
+	else
+		ret = ioctl(fd, BTRFS_IOC_DEFRAG_RANGE, range);
+
+	return ret;
+}
+
+static int defrag_global_fancy_ioctl;
+static struct btrfs_ioctl_defrag_range_args defrag_global_range;
+static int defrag_global_verbose;
+static int defrag_global_errors;
+static int defrag_callback(const char *fpath, const struct stat *sb,
+		int typeflag, struct FTW *ftwbuf)
+{
+	int ret = 0;
+	int e = 0;
+	int fd = 0;
+
+	if ((typeflag == FTW_F) && S_ISREG(sb->st_mode)) {
+		if (defrag_global_verbose)
+			printf("%s\n", fpath);
+		fd = open(fpath, O_RDWR);
+		if (fd < 0)
+			goto error;
+		ret = do_defrag(fd, defrag_global_fancy_ioctl, &defrag_global_range);
+		e = errno;
+		close(fd);
+		if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
+			error("defrag range ioctl not "
+				"supported in this kernel, please try "
+				"without any options.");
+			defrag_global_errors++;
+			return ENOTTY;
+		}
+		if (ret)
+			goto error;
+	}
+	return 0;
+
+error:
+	error("defrag failed on %s: %s", fpath, strerror(e));
+	defrag_global_errors++;
+	return 0;
+}
+
+static int cmd_filesystem_defrag(int argc, char **argv)
+{
+	int fd;
+	int flush = 0;
+	u64 start = 0;
+	u64 len = (u64)-1;
+	u64 thresh = 0;
+	int i;
+	int recursive = 0;
+	int ret = 0;
+	int e = 0;
+	int compress_type = BTRFS_COMPRESS_NONE;
+	DIR *dirstream;
+
+	defrag_global_errors = 0;
+	defrag_global_verbose = 0;
+	defrag_global_errors = 0;
+	defrag_global_fancy_ioctl = 0;
+	optind = 1;
+	while(1) {
+		int c = getopt(argc, argv, "vrc::fs:l:t:");
+		if (c < 0)
+			break;
+
+		switch(c) {
+		case 'c':
+			compress_type = BTRFS_COMPRESS_ZLIB;
+			if (optarg)
+				compress_type = parse_compress_type(optarg);
+			defrag_global_fancy_ioctl = 1;
+			break;
+		case 'f':
+			flush = 1;
+			defrag_global_fancy_ioctl = 1;
+			break;
+		case 'v':
+			defrag_global_verbose = 1;
+			break;
+		case 's':
+			start = parse_size(optarg);
+			defrag_global_fancy_ioctl = 1;
+			break;
+		case 'l':
+			len = parse_size(optarg);
+			defrag_global_fancy_ioctl = 1;
+			break;
+		case 't':
+			thresh = parse_size(optarg);
+			if (thresh > (u32)-1) {
+				warning(
+			    "target extent size %llu too big, trimmed to %u",
+					thresh, (u32)-1);
+				thresh = (u32)-1;
+			}
+			defrag_global_fancy_ioctl = 1;
+			break;
+		case 'r':
+			recursive = 1;
+			break;
+		default:
+			usage(cmd_filesystem_defrag_usage);
+		}
+	}
+
+	if (check_argc_min(argc - optind, 1))
+		usage(cmd_filesystem_defrag_usage);
+
+	memset(&defrag_global_range, 0, sizeof(defrag_global_range));
+	defrag_global_range.start = start;
+	defrag_global_range.len = len;
+	defrag_global_range.extent_thresh = (u32)thresh;
+	if (compress_type) {
+		defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
+		defrag_global_range.compress_type = compress_type;
+	}
+	if (flush)
+		defrag_global_range.flags |= BTRFS_DEFRAG_RANGE_START_IO;
+
+	for (i = optind; i < argc; i++) {
+		struct stat st;
+
+		dirstream = NULL;
+		fd = open_file_or_dir(argv[i], &dirstream);
+		if (fd < 0) {
+			error("cannot open %s: %s\n", argv[i],
+					strerror(errno));
+			defrag_global_errors++;
+			close_file_or_dir(fd, dirstream);
+			continue;
+		}
+		if (fstat(fd, &st)) {
+			error("failed to stat %s: %s",
+					argv[i], strerror(errno));
+			defrag_global_errors++;
+			close_file_or_dir(fd, dirstream);
+			continue;
+		}
+		if (!(S_ISDIR(st.st_mode) || S_ISREG(st.st_mode))) {
+			error("%s is not a directory or a regular file\n",
+					argv[i]);
+			defrag_global_errors++;
+			close_file_or_dir(fd, dirstream);
+			continue;
+		}
+		if (recursive) {
+			if (S_ISDIR(st.st_mode)) {
+				ret = nftw(argv[i], defrag_callback, 10,
+						FTW_MOUNT | FTW_PHYS);
+				if (ret == ENOTTY)
+					exit(1);
+				/* errors are handled in the callback */
+				ret = 0;
+			} else {
+				if (defrag_global_verbose)
+					printf("%s\n", argv[i]);
+				ret = do_defrag(fd, defrag_global_fancy_ioctl,
+						&defrag_global_range);
+				e = errno;
+			}
+		} else {
+			if (defrag_global_verbose)
+				printf("%s\n", argv[i]);
+			ret = do_defrag(fd, defrag_global_fancy_ioctl,
+					&defrag_global_range);
+			e = errno;
+		}
+		close_file_or_dir(fd, dirstream);
+		if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
+			error("defrag range ioctl not "
+				"supported in this kernel, please try "
+				"without any options.");
+			defrag_global_errors++;
+			break;
+		}
+		if (ret) {
+			error("defrag failed on %s: %s", argv[i], strerror(e));
+			defrag_global_errors++;
+		}
+	}
+	if (defrag_global_errors)
+		fprintf(stderr, "total %d failures\n", defrag_global_errors);
+
+	return !!defrag_global_errors;
+}
+
+static const char * const cmd_filesystem_resize_usage[] = {
+	"btrfs filesystem resize [devid:][+/-]<newsize>[kKmMgGtTpPeE]|[devid:]max <path>",
+	"Resize a filesystem",
+	"If 'max' is passed, the filesystem will occupy all available space",
+	"on the device 'devid'.",
+	"[kK] means KiB, which denotes 1KiB = 1024B, 1MiB = 1024KiB, etc.",
+	NULL
+};
+
+static int cmd_filesystem_resize(int argc, char **argv)
+{
+	struct btrfs_ioctl_vol_args	args;
+	int	fd, res, len, e;
+	char	*amount, *path;
+	DIR	*dirstream = NULL;
+	struct stat st;
+
+	clean_args_no_options_relaxed(argc, argv, cmd_filesystem_resize_usage);
+
+	if (check_argc_exact(argc - optind, 2))
+		usage(cmd_filesystem_resize_usage);
+
+	amount = argv[optind];
+	path = argv[optind + 1];
+
+	len = strlen(amount);
+	if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
+		error("resize value too long (%s)", amount);
+		return 1;
+	}
+
+	res = stat(path, &st);
+	if (res < 0) {
+		error("resize: cannot stat %s: %s", path, strerror(errno));
+		return 1;
+	}
+	if (!S_ISDIR(st.st_mode)) {
+		error("resize works on mounted filesystems and accepts only\n"
+			"directories as argument. Passing file containing a btrfs image\n"
+			"would resize the underlying filesystem instead of the image.\n");
+		return 1;
+	}
+
+	fd = btrfs_open_dir(path, &dirstream, 1);
+	if (fd < 0)
+		return 1;
+
+	printf("Resize '%s' of '%s'\n", path, amount);
+	memset(&args, 0, sizeof(args));
+	strncpy_null(args.name, amount);
+	res = ioctl(fd, BTRFS_IOC_RESIZE, &args);
+	e = errno;
+	close_file_or_dir(fd, dirstream);
+	if( res < 0 ){
+		switch (e) {
+		case EFBIG:
+			error("unable to resize '%s': no enough free space",
+				path);
+			break;
+		default:
+			error("unable to resize '%s': %s", path, strerror(e));
+			break;
+		}
+		return 1;
+	} else if (res > 0) {
+		const char *err_str = btrfs_err_str(res);
+
+		if (err_str) {
+			error("resizing of '%s' failed: %s", path, err_str);
+		} else {
+			error("resizing of '%s' failed: unknown error %d",
+				path, res);
+		}
+		return 1;
+	}
+	return 0;
+}
+
+static const char * const cmd_filesystem_label_usage[] = {
+	"btrfs filesystem label [<device>|<mount_point>] [<newlabel>]",
+	"Get or change the label of a filesystem",
+	"With one argument, get the label of filesystem on <device>.",
+	"If <newlabel> is passed, set the filesystem label to <newlabel>.",
+	NULL
+};
+
+static int cmd_filesystem_label(int argc, char **argv)
+{
+	clean_args_no_options(argc, argv, cmd_filesystem_label_usage);
+
+	if (check_argc_min(argc - optind, 1) ||
+			check_argc_max(argc - optind, 2))
+		usage(cmd_filesystem_label_usage);
+
+	if (argc - optind > 1) {
+		return set_label(argv[optind], argv[optind + 1]);
+	} else {
+		char label[BTRFS_LABEL_SIZE];
+		int ret;
+
+		ret = get_label(argv[optind], label);
+		if (!ret)
+			fprintf(stdout, "%s\n", label);
+
+		return ret;
+	}
+}
+
+static const char filesystem_cmd_group_info[] =
+"overall filesystem tasks and information";
+
+const struct cmd_group filesystem_cmd_group = {
+	filesystem_cmd_group_usage, filesystem_cmd_group_info, {
+		{ "df", cmd_filesystem_df, cmd_filesystem_df_usage, NULL, 0 },
+		{ "du", cmd_filesystem_du, cmd_filesystem_du_usage, NULL, 0 },
+		{ "show", cmd_filesystem_show, cmd_filesystem_show_usage, NULL,
+			0 },
+		{ "sync", cmd_filesystem_sync, cmd_filesystem_sync_usage, NULL,
+			0 },
+		{ "defragment", cmd_filesystem_defrag,
+			cmd_filesystem_defrag_usage, NULL, 0 },
+		{ "balance", cmd_balance, NULL, &balance_cmd_group,
+			CMD_HIDDEN },
+		{ "resize", cmd_filesystem_resize, cmd_filesystem_resize_usage,
+			NULL, 0 },
+		{ "label", cmd_filesystem_label, cmd_filesystem_label_usage,
+			NULL, 0 },
+		{ "usage", cmd_filesystem_usage,
+			cmd_filesystem_usage_usage, NULL, 0 },
+
+		NULL_CMD_STRUCT
+	}
+};
+
+int cmd_filesystem(int argc, char **argv)
+{
+	return handle_command_group(&filesystem_cmd_group, argc, argv);
+}