X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=cmds-filesystem.c;h=b44a65532bf9d48998efec000afad389d849ac54;hb=a57606e815f3e1c4fe66c61ce3c6e3621ea522e9;hp=384d1b96b7a0581abe21b04938cd367a254273da;hpb=ef3f6124f0b5e8be126999f27f7f299a6bb3fbf6;p=platform%2Fupstream%2Fbtrfs-progs.git

diff --git a/cmds-filesystem.c b/cmds-filesystem.c
index 384d1b9..b44a655 100644
--- a/cmds-filesystem.c
+++ b/cmds-filesystem.c
@@ -14,7 +14,6 @@
  * Boston, MA 021110-1307, USA.
  */
 
-#define _XOPEN_SOURCE 500
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -34,9 +33,10 @@
 #include "ioctl.h"
 #include "utils.h"
 #include "volumes.h"
-#include "version.h"
 #include "commands.h"
+#include "cmds-fi-usage.h"
 #include "list_sort.h"
+#include "disk-io.h"
 
 
 /*
@@ -52,6 +52,15 @@ struct seen_fsid {
 
 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];
+
+	return seen ? 1 : 0;
+}
+
 static int add_seen_fsid(u8 *fsid)
 {
 	u8 hash = fsid[0];
@@ -111,50 +120,22 @@ static const char * const filesystem_cmd_group_usage[] = {
 	NULL
 };
 
-static const char * const cmd_df_usage[] = {
-	"btrfs filesystem df <path>",
-	"Show space usage information for a mount point",
-	NULL
+static const char * const cmd_filesystem_df_usage[] = {
+       "btrfs filesystem df [options] <path>",
+       "Show space usage information for a mount point",
+	"-b|--raw           raw numbers in bytes",
+	"-h|--human-readable",
+	"                   human friendly numbers, base 1024 (default)",
+	"-H                 human friendly numbers, base 1000",
+	"--iec              use 1024 as a base (KiB, MiB, GiB, TiB)",
+	"--si               use 1000 as a base (kB, MB, GB, TB)",
+	"-k|--kbytes        show sizes in KiB, or kB with --si",
+	"-m|--mbytes        show sizes in MiB, or MB with --si",
+	"-g|--gbytes        show sizes in GiB, or GB with --si",
+	"-t|--tbytes        show sizes in TiB, or TB with --si",
+       NULL
 };
 
-static char *group_type_str(u64 flag)
-{
-	switch (flag & BTRFS_BLOCK_GROUP_TYPE_MASK) {
-	case BTRFS_BLOCK_GROUP_DATA:
-		return "Data";
-	case BTRFS_BLOCK_GROUP_SYSTEM:
-		return "System";
-	case BTRFS_BLOCK_GROUP_METADATA:
-		return "Metadata";
-	case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
-		return "Data+Metadata";
-	default:
-		return "unknown";
-	}
-}
-
-static char *group_profile_str(u64 flag)
-{
-	switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
-	case 0:
-		return "single";
-	case BTRFS_BLOCK_GROUP_RAID0:
-		return "RAID0";
-	case BTRFS_BLOCK_GROUP_RAID1:
-		return "RAID1";
-	case BTRFS_BLOCK_GROUP_RAID5:
-		return "RAID5";
-	case BTRFS_BLOCK_GROUP_RAID6:
-		return "RAID6";
-	case BTRFS_BLOCK_GROUP_DUP:
-		return "DUP";
-	case BTRFS_BLOCK_GROUP_RAID10:
-		return "RAID10";
-	default:
-		return "unknown";
-	}
-}
-
 static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
 {
 	u64 count = 0;
@@ -187,7 +168,7 @@ static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
 	sargs = malloc(sizeof(struct btrfs_ioctl_space_args) +
 			(count * sizeof(struct btrfs_ioctl_space_info)));
 	if (!sargs)
-		ret = -ENOMEM;
+		return -ENOMEM;
 
 	sargs->space_slots = count;
 	sargs->total_spaces = 0;
@@ -203,32 +184,85 @@ static int get_df(int fd, struct btrfs_ioctl_space_args **sargs_ret)
 	return 0;
 }
 
-static void print_df(struct btrfs_ioctl_space_args *sargs)
+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",
-			group_type_str(sp->flags),
-			group_profile_str(sp->flags),
-			pretty_size(sp->total_bytes),
-			pretty_size(sp->used_bytes));
+			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_df(int argc, char **argv)
+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;
+	DIR *dirstream = NULL;
+	unsigned unit_mode = UNITS_DEFAULT;
 
-	if (check_argc_exact(argc, 2))
-		usage(cmd_df_usage);
+	while (1) {
+		int c;
+		static const struct option long_options[] = {
+			{ "raw", no_argument, NULL, 'b'},
+			{ "kbytes", no_argument, NULL, 'k'},
+			{ "mbytes", no_argument, NULL, 'm'},
+			{ "gbytes", no_argument, NULL, 'g'},
+			{ "tbytes", no_argument, NULL, 't'},
+			{ "si", no_argument, NULL, GETOPT_VAL_SI},
+			{ "iec", no_argument, NULL, GETOPT_VAL_IEC},
+			{ "human-readable", no_argument, NULL,
+				GETOPT_VAL_HUMAN_READABLE},
+			{ NULL, 0, NULL, 0 }
+		};
 
-	path = argv[1];
+		c = getopt_long(argc, argv, "bhHkmgt", long_options, NULL);
+		if (c < 0)
+			break;
+		switch (c) {
+		case 'b':
+			unit_mode = UNITS_RAW;
+			break;
+		case 'k':
+			units_set_base(&unit_mode, UNITS_KBYTES);
+			break;
+		case 'm':
+			units_set_base(&unit_mode, UNITS_MBYTES);
+			break;
+		case 'g':
+			units_set_base(&unit_mode, UNITS_GBYTES);
+			break;
+		case 't':
+			units_set_base(&unit_mode, UNITS_TBYTES);
+			break;
+		case GETOPT_VAL_HUMAN_READABLE:
+		case 'h':
+			unit_mode = UNITS_HUMAN_BINARY;
+			break;
+		case 'H':
+			unit_mode = UNITS_HUMAN_DECIMAL;
+			break;
+		case GETOPT_VAL_SI:
+			units_set_mode(&unit_mode, UNITS_DECIMAL);
+			break;
+		case GETOPT_VAL_IEC:
+			units_set_mode(&unit_mode, UNITS_BINARY);
+			break;
+		default:
+			usage(cmd_filesystem_df_usage);
+		}
+	}
+
+	if (check_argc_exact(argc, optind + 1))
+		usage(cmd_filesystem_df_usage);
+
+	path = argv[optind];
 
 	fd = open_file_or_dir(path, &dirstream);
 	if (fd < 0) {
@@ -237,8 +271,8 @@ static int cmd_df(int argc, char **argv)
 	}
 	ret = get_df(fd, &sargs);
 
-	if (!ret && sargs) {
-		print_df(sargs);
+	if (ret == 0) {
+		print_df(sargs, unit_mode);
 		free(sargs);
 	} else {
 		fprintf(stderr, "ERROR: get_df failed %s\n", strerror(-ret));
@@ -304,10 +338,73 @@ static int cmp_device_id(void *priv, struct list_head *a,
 		da->devid > db->devid ? 1 : 0;
 }
 
-static void print_one_uuid(struct btrfs_fs_devices *fs_devices)
+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 list_head *cur;
 	struct btrfs_device *device;
 	u64 devs_found = 0;
 	u64 total;
@@ -323,23 +420,13 @@ static void print_one_uuid(struct btrfs_fs_devices *fs_devices)
 	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(device->super_bytes_used));
+	       pretty_size_mode(device->super_bytes_used, unit_mode));
 
-	list_sort(NULL, &fs_devices->devices, cmp_device_id);
-	list_for_each(cur, &fs_devices->devices) {
-		device = list_entry(cur, struct btrfs_device, dev_list);
-
-		printf("\tdevid %4llu size %s used %s path %s\n",
-		       (unsigned long long)device->devid,
-		       pretty_size(device->total_bytes),
-		       pretty_size(device->bytes_used), device->name);
+	print_devices(fs_devices, &devs_found, unit_mode);
 
-		devs_found++;
-	}
 	if (devs_found < total) {
 		printf("\t*** Some devices missing\n");
 	}
@@ -360,9 +447,11 @@ static u64 calc_used_bytes(struct btrfs_ioctl_space_args *si)
 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, char *path)
+		char *label, char *path, 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;
@@ -381,61 +470,46 @@ static int print_one_fs(struct btrfs_ioctl_fs_info_args *fs_info,
 
 	printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
 			fs_info->num_devices,
-			pretty_size(calc_used_bytes(space_info)));
+			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(tmp_dev_info->total_bytes),
-			pretty_size(tmp_dev_info->bytes_used),
-			tmp_dev_info->path);
+			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;
 }
 
-/* This function checks if the given input parameter is
- * an uuid or a path
- * return -1: some error in the given input
- * return 0: unknow input
- * return 1: given input is uuid
- * return 2: given input is path
- */
-static int check_arg_type(char *input)
-{
-	uuid_t	out;
-	char path[PATH_MAX];
-
-	if (!input)
-		return -EINVAL;
-
-	if (realpath(input, path)) {
-		if (is_block_device(input) == 1)
-			return BTRFS_ARG_BLKDEV;
-
-		if (is_mount_point(input) == 1)
-			return BTRFS_ARG_MNTPOINT;
-
-		return BTRFS_ARG_UNKNOWN;
-	}
-
-	if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
-		!uuid_parse(input, out))
-		return BTRFS_ARG_UUID;
-
-	return BTRFS_ARG_UNKNOWN;
-}
-
-static int btrfs_scan_kernel(void *search)
+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;
+	struct btrfs_ioctl_space_args *space_info_arg = NULL;
 	char label[BTRFS_LABEL_SIZE];
 
 	f = setmntent("/proc/self/mounts", "r");
@@ -448,12 +522,13 @@ static int btrfs_scan_kernel(void *search)
 			continue;
 		ret = get_fs_info(mnt->mnt_dir, &fs_info_arg,
 				&dev_info_arg);
-		if (ret)
+		if (ret) {
+			kfree(dev_info_arg);
 			goto out;
+		}
 
 		if (get_label_mounted(mnt->mnt_dir, label)) {
 			kfree(dev_info_arg);
-			ret = 1;
 			goto out;
 		}
 		if (search && !match_search_item_kernel(fs_info_arg.fsid,
@@ -465,63 +540,365 @@ static int btrfs_scan_kernel(void *search)
 		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, mnt->mnt_dir);
+				     space_info_arg, label, mnt->mnt_dir,
+				     unit_mode);
 			kfree(space_info_arg);
 			memset(label, 0, sizeof(label));
+			found = 1;
 		}
 		if (fd != -1)
 			close(fd);
 		kfree(dev_info_arg);
-		if (search)
-			ret = 0;
 	}
-	if (search)
-		ret = 1;
 
 out:
 	endmntent(f);
+	return !found;
+}
+
+static int dev_to_fsid(char *dev, __u8 *fsid)
+{
+	struct btrfs_super_block *disk_super;
+	char *buf;
+	int ret;
+	int fd;
+
+	buf = malloc(4096);
+	if (!buf)
+		return -ENOMEM;
+
+	fd = open(dev, O_RDONLY);
+	if (fd < 0) {
+		ret = -errno;
+		free(buf);
+		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);
+	free(buf);
+	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 = malloc(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,
+						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_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",
+	"--raw              raw numbers in bytes",
+	"--human-readable   human friendly numbers, base 1024 (default)",
+	"--iec              use 1024 as a base (KiB, MiB, GiB, TiB)",
+	"--si               use 1000 as a base (kB, MB, GB, TB)",
+	"--kbytes           show sizes in KiB, or kB with --si",
+	"--mbytes           show sizes in MiB, or MB with --si",
+	"--gbytes           show sizes in GiB, or GB with --si",
+	"--tbytes           show sizes in TiB, or TB with --si",
 	"If no argument is given, structure of all present filesystems is shown.",
 	NULL
 };
 
 static int cmd_show(int argc, char **argv)
 {
-	struct list_head *all_uuids;
+	LIST_HEAD(all_uuids);
 	struct btrfs_fs_devices *fs_devices;
-	struct list_head *cur_uuid;
 	char *search = NULL;
 	int ret;
-	int where = BTRFS_SCAN_LBLKID;
+	/* default, search both kernel and udev */
+	int where = -1;
 	int type = 0;
-	char mp[BTRFS_PATH_NAME_MAX + 1];
+	char mp[PATH_MAX];
 	char path[PATH_MAX];
+	__u8 fsid[BTRFS_FSID_SIZE];
+	char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
+	unsigned unit_mode = UNITS_DEFAULT;
+	int found = 0;
 
 	while (1) {
-		int long_index;
-		static struct option long_options[] = {
+		int c;
+		static const struct option long_options[] = {
 			{ "all-devices", no_argument, NULL, 'd'},
 			{ "mounted", no_argument, NULL, 'm'},
-			{ NULL, no_argument, NULL, 0 },
+			{ "raw", no_argument, NULL, GETOPT_VAL_RAW},
+			{ "kbytes", no_argument, NULL, GETOPT_VAL_KBYTES},
+			{ "mbytes", no_argument, NULL, GETOPT_VAL_MBYTES},
+			{ "gbytes", no_argument, NULL, GETOPT_VAL_GBYTES},
+			{ "tbytes", no_argument, NULL, GETOPT_VAL_TBYTES},
+			{ "si", no_argument, NULL, GETOPT_VAL_SI},
+			{ "iec", no_argument, NULL, GETOPT_VAL_IEC},
+			{ "human-readable", no_argument, NULL,
+				GETOPT_VAL_HUMAN_READABLE},
+			{ NULL, 0, NULL, 0 }
 		};
-		int c = getopt_long(argc, argv, "dm", long_options,
-					&long_index);
+
+		c = getopt_long(argc, argv, "dm", long_options, NULL);
 		if (c < 0)
 			break;
 		switch (c) {
 		case 'd':
-			where = BTRFS_SCAN_DEV;
+			where = BTRFS_SCAN_LBLKID;
 			break;
 		case 'm':
 			where = BTRFS_SCAN_MOUNTED;
 			break;
+		case GETOPT_VAL_RAW:
+			units_set_mode(&unit_mode, UNITS_RAW);
+			break;
+		case GETOPT_VAL_KBYTES:
+			units_set_base(&unit_mode, UNITS_KBYTES);
+			break;
+		case GETOPT_VAL_MBYTES:
+			units_set_base(&unit_mode, UNITS_MBYTES);
+			break;
+		case GETOPT_VAL_GBYTES:
+			units_set_base(&unit_mode, UNITS_GBYTES);
+			break;
+		case GETOPT_VAL_TBYTES:
+			units_set_base(&unit_mode, UNITS_TBYTES);
+			break;
+		case GETOPT_VAL_SI:
+			units_set_mode(&unit_mode, UNITS_DECIMAL);
+			break;
+		case GETOPT_VAL_IEC:
+			units_set_mode(&unit_mode, UNITS_BINARY);
+			break;
+		case GETOPT_VAL_HUMAN_READABLE:
+			units_set_mode(&unit_mode, UNITS_HUMAN_BINARY);
+			break;
 		default:
 			usage(cmd_show_usage);
 		}
@@ -535,60 +912,99 @@ static int cmd_show(int argc, char **argv)
 		if (strlen(search) == 0)
 			usage(cmd_show_usage);
 		type = check_arg_type(search);
-		if (type == BTRFS_ARG_BLKDEV) {
-			if (where == BTRFS_SCAN_DEV) {
-				/* we need to do this because
-				 * legacy BTRFS_SCAN_DEV
-				 * provides /dev/dm-x paths
-				 */
-				if (realpath(search, path))
-					search = path;
+
+		/*
+		 * 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 = get_btrfs_mount(search,
-						mp, sizeof(mp));
-				if (!ret)
-					/* given block dev is mounted*/
-					search = mp;
-				else
-					goto devs_only;
+				ret = dev_to_fsid(search, fsid);
+				if (ret) {
+					fprintf(stderr,
+						"ERROR: No btrfs on %s\n",
+						search);
+					return 1;
+				}
+				uuid_unparse(fsid, uuid_buf);
+				search = uuid_buf;
+				type = BTRFS_ARG_UUID;
+				goto devs_only;
 			}
 		}
 	}
 
-	if (where == BTRFS_SCAN_DEV)
+	if (where == BTRFS_SCAN_LBLKID)
 		goto devs_only;
 
 	/* show mounted btrfs */
-	ret = btrfs_scan_kernel(search);
-	if (search && !ret)
-		return 0;
+	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 = scan_for_btrfs(where, !BTRFS_UPDATE_KERNEL);
+	ret = btrfs_scan_lblkid();
 
 	if (ret) {
 		fprintf(stderr, "ERROR: %d while scanning\n", ret);
 		return 1;
 	}
-	
-	all_uuids = btrfs_scanned_uuids();
-	list_for_each(cur_uuid, all_uuids) {
-		fs_devices = list_entry(cur_uuid, struct btrfs_fs_devices,
-					list);
-		if (search && uuid_search(fs_devices, search) == 0)
-			continue;
 
-		print_one_uuid(fs_devices);
+	ret = search_umounted_fs_uuids(&all_uuids, search, &found);
+	if (ret < 0) {
+		fprintf(stderr,
+			"ERROR: %d while searching target device\n", 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) {
+		fprintf(stderr,
+			"ERROR: %d while mapping seed devices\n", ret);
+		return 1;
+	}
+
+	list_for_each_entry(fs_devices, &all_uuids, list)
+		print_one_uuid(fs_devices, unit_mode);
+
+	if (search && !found)
+		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:
-	printf("%s\n", BTRFS_BUILD_VERSION);
+	printf("%s\n", PACKAGE_STRING);
 	free_seen_fsid();
-	return 0;
+	return ret;
 }
 
 static const char * const cmd_sync_usage[] = {
@@ -649,7 +1065,7 @@ static const char * const cmd_defrag_usage[] = {
 	"-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        minimal size of file to be considered for defragmenting",
+	"-t size        target extent size hint",
 	NULL
 };
 
@@ -711,7 +1127,7 @@ static int cmd_defrag(int argc, char **argv)
 	int flush = 0;
 	u64 start = 0;
 	u64 len = (u64)-1;
-	u32 thresh = 0;
+	u64 thresh = 0;
 	int i;
 	int recursive = 0;
 	int ret = 0;
@@ -754,6 +1170,11 @@ static int cmd_defrag(int argc, char **argv)
 			break;
 		case 't':
 			thresh = parse_size(optarg);
+			if (thresh > (u32)-1) {
+				fprintf(stderr,
+			"WARNING: target extent size %llu too big, trimmed to %u",
+					thresh, (u32)-1);
+			}
 			defrag_global_fancy_ioctl = 1;
 			break;
 		case 'r':
@@ -770,7 +1191,7 @@ static int cmd_defrag(int argc, char **argv)
 	memset(&defrag_global_range, 0, sizeof(range));
 	defrag_global_range.start = start;
 	defrag_global_range.len = len;
-	defrag_global_range.extent_thresh = thresh;
+	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;
@@ -842,7 +1263,7 @@ static int cmd_defrag(int argc, char **argv)
 		}
 	}
 	if (defrag_global_verbose)
-		printf("%s\n", BTRFS_BUILD_VERSION);
+		printf("%s\n", PACKAGE_STRING);
 	if (defrag_global_errors)
 		fprintf(stderr, "total %d failures\n", defrag_global_errors);
 
@@ -850,19 +1271,271 @@ static int cmd_defrag(int argc, char **argv)
 }
 
 static const char * const cmd_resize_usage[] = {
-	"btrfs filesystem resize [devid:][+/-]<newsize>[gkm]|[devid:]max <path>",
+	"btrfs filesystem resize [devid:][+/-]<newsize>[kKmMgGtTpPeE]|[devid:]max|[devid:]get_min_size <path>",
 	"Resize a filesystem",
 	"If 'max' is passed, the filesystem will occupy all available space",
 	"on the device 'devid'.",
+	"If 'get_min_size' is passed, return the minimum size the device can",
+	"be shrunk to.",
+	"[kK] means KiB, which denotes 1KiB = 1024B, 1MiB = 1024KiB, etc.",
 	NULL
 };
 
+struct dev_extent_elem {
+	u64 start;
+	/* inclusive end */
+	u64 end;
+	struct list_head list;
+};
+
+static int add_dev_extent(struct list_head *list,
+			  const u64 start, const u64 end,
+			  const int append)
+{
+	struct dev_extent_elem *e;
+
+	e = malloc(sizeof(*e));
+	if (!e)
+		return -ENOMEM;
+
+	e->start = start;
+	e->end = end;
+
+	if (append)
+		list_add_tail(&e->list, list);
+	else
+		list_add(&e->list, list);
+
+	return 0;
+}
+
+static void free_dev_extent_list(struct list_head *list)
+{
+	while (!list_empty(list)) {
+		struct dev_extent_elem *e;
+
+		e = list_first_entry(list, struct dev_extent_elem, list);
+		list_del(&e->list);
+		free(e);
+	}
+}
+
+static int hole_includes_sb_mirror(const u64 start, const u64 end)
+{
+	int i;
+	int ret = 0;
+
+	for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
+		u64 bytenr = btrfs_sb_offset(i);
+
+		if (bytenr >= start && bytenr <= end) {
+			ret = 1;
+			break;
+		}
+	}
+
+	return ret;
+}
+
+static void adjust_dev_min_size(struct list_head *extents,
+				struct list_head *holes,
+				u64 *min_size)
+{
+	/*
+	 * If relocation of the block group of a device extent must happen (see
+	 * below) scratch space is used for the relocation. So track here the
+	 * size of the largest device extent that has to be relocated. We track
+	 * only the largest and not the sum of the sizes of all relocated block
+	 * groups because after each block group is relocated the running
+	 * transaction is committed so that pinned space is released.
+	 */
+	u64 scratch_space = 0;
+
+	/*
+	 * List of device extents is sorted by descending order of the extent's
+	 * end offset. If some extent goes beyond the computed minimum size,
+	 * which initially matches the sum of the lenghts of all extents,
+	 * we need to check if the extent can be relocated to an hole in the
+	 * device between [0, *min_size[ (which is what the resize ioctl does).
+	 */
+	while (!list_empty(extents)) {
+		struct dev_extent_elem *e;
+		struct dev_extent_elem *h;
+		int found = 0;
+		u64 extent_len;
+		u64 hole_len = 0;
+
+		e = list_first_entry(extents, struct dev_extent_elem, list);
+		if (e->end <= *min_size)
+			break;
+
+		/*
+		 * Our extent goes beyond the computed *min_size. See if we can
+		 * find a hole large enough to relocate it to. If not we must stop
+		 * and set *min_size to the end of the extent.
+		 */
+		extent_len = e->end - e->start + 1;
+		list_for_each_entry(h, holes, list) {
+			hole_len = h->end - h->start + 1;
+			if (hole_len >= extent_len) {
+				found = 1;
+				break;
+			}
+		}
+
+		if (!found) {
+			*min_size = e->end + 1;
+			break;
+		}
+
+		/*
+		 * If the hole found contains the location for a superblock
+		 * mirror, we are pessimistic and require allocating one
+		 * more extent of the same size. This is because the block
+		 * group could be in the worst case used by a single extent
+		 * with a size >= (block_group.length - superblock.size).
+		 */
+		if (hole_includes_sb_mirror(h->start,
+					    h->start + extent_len - 1))
+			*min_size += extent_len;
+
+		if (hole_len > extent_len) {
+			h->start += extent_len;
+		} else {
+			list_del(&h->list);
+			free(h);
+		}
+
+		list_del(&e->list);
+		free(e);
+
+		if (extent_len > scratch_space)
+			scratch_space = extent_len;
+	}
+
+	if (scratch_space) {
+		*min_size += scratch_space;
+		/*
+		 * Chunk allocation requires inserting/updating items in the
+		 * chunk tree, so often this can lead to the need of allocating
+		 * a new system chunk too, which has a maximum size of 32Mb.
+		 */
+		*min_size += 32 * 1024 * 1024;
+	}
+}
+
+static int get_min_size(int fd, DIR *dirstream, const char *amount)
+{
+	int ret = 1;
+	char *p = strstr(amount, ":");
+	u64 devid = 1;
+	/*
+	 * Device allocations starts at 1Mb or at the value passed through the
+	 * mount option alloc_start if it's bigger than 1Mb. The alloc_start
+	 * option is used for debugging and testing only, and recently the
+	 * possibility of deprecating/removing it has been discussed, so we
+	 * ignore it here.
+	 */
+	u64 min_size = 1 * 1024 * 1024ull;
+	struct btrfs_ioctl_search_args args;
+	struct btrfs_ioctl_search_key *sk = &args.key;
+	u64 last_pos = (u64)-1;
+	LIST_HEAD(extents);
+	LIST_HEAD(holes);
+
+	if (p && sscanf(amount, "%llu:get_min_size", &devid) != 1) {
+		fprintf(stderr, "Invalid parameter: %s\n", amount);
+		goto out;
+	}
+
+	memset(&args, 0, sizeof(args));
+	sk->tree_id = BTRFS_DEV_TREE_OBJECTID;
+	sk->min_objectid = devid;
+	sk->max_objectid = devid;
+	sk->max_type = BTRFS_DEV_EXTENT_KEY;
+	sk->min_type = BTRFS_DEV_EXTENT_KEY;
+	sk->min_offset = 0;
+	sk->max_offset = (u64)-1;
+	sk->min_transid = 0;
+	sk->max_transid = (u64)-1;
+	sk->nr_items = 4096;
+
+	while (1) {
+		int i;
+		struct btrfs_ioctl_search_header *sh;
+		unsigned long off = 0;
+
+		ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
+		if (ret < 0) {
+			fprintf(stderr,
+				"Error invoking tree search ioctl: %s\n",
+				strerror(errno));
+			ret = 1;
+			goto out;
+		}
+
+		if (sk->nr_items == 0)
+			break;
+
+		for (i = 0; i < sk->nr_items; i++) {
+			struct btrfs_dev_extent *extent;
+			u64 len;
+
+			sh = (struct btrfs_ioctl_search_header *)(args.buf +
+								  off);
+			off += sizeof(*sh);
+			extent = (struct btrfs_dev_extent *)(args.buf + off);
+			off += sh->len;
+
+			sk->min_objectid = sh->objectid;
+			sk->min_type = sh->type;
+			sk->min_offset = sh->offset + 1;
+
+			if (sh->objectid != devid ||
+			    sh->type != BTRFS_DEV_EXTENT_KEY)
+				continue;
+
+			len = btrfs_stack_dev_extent_length(extent);
+			min_size += len;
+			ret = add_dev_extent(&extents, sh->offset,
+					     sh->offset + len - 1, 0);
+
+			if (!ret && last_pos != (u64)-1 &&
+			    last_pos != sh->offset)
+				ret = add_dev_extent(&holes, last_pos,
+						     sh->offset - 1, 1);
+			if (ret) {
+				fprintf(stderr, "Error: %s\n", strerror(-ret));
+				ret = 1;
+				goto out;
+			}
+
+			last_pos = sh->offset + len;
+		}
+
+		if (sk->min_type != BTRFS_DEV_EXTENT_KEY ||
+		    sk->min_objectid != devid)
+			break;
+	}
+
+	adjust_dev_min_size(&extents, &holes, &min_size);
+	printf("%llu bytes (%s)\n", min_size, pretty_size(min_size));
+	ret = 0;
+out:
+	close_file_or_dir(fd, dirstream);
+	free_dev_extent_list(&extents);
+	free_dev_extent_list(&holes);
+
+	return ret;
+}
+
 static int cmd_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;
 
 	if (check_argc_exact(argc, 3))
 		usage(cmd_resize_usage);
@@ -877,13 +1550,31 @@ static int cmd_resize(int argc, char **argv)
 		return 1;
 	}
 
+	res = stat(path, &st);
+	if (res < 0) {
+		fprintf(stderr, "ERROR: resize: cannot stat %s: %s\n",
+				path, strerror(errno));
+		return 1;
+	}
+	if (!S_ISDIR(st.st_mode)) {
+		fprintf(stderr,
+			"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 = open_file_or_dir(path, &dirstream);
 	if (fd < 0) {
 		fprintf(stderr, "ERROR: can't access '%s'\n", path);
 		return 1;
 	}
 
+	if (strstr(amount, "get_min_size"))
+		return get_min_size(fd, dirstream, amount);
+
 	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;
@@ -892,6 +1583,18 @@ static int cmd_resize(int argc, char **argv)
 		fprintf(stderr, "ERROR: unable to resize '%s' - %s\n", 
 			path, strerror(e));
 		return 1;
+	} else if (res > 0) {
+		const char *err_str = btrfs_err_str(res);
+
+		if (err_str) {
+			fprintf(stderr, "ERROR: btrfs error resizing '%s' - %s\n",
+				path, err_str);
+		} else {
+			fprintf(stderr,
+			"ERROR: btrfs error resizing '%s' - unknown btrfs_err_code %d\n",
+				path, res);
+		}
+		return 1;
 	}
 	return 0;
 }
@@ -923,15 +1626,21 @@ static int cmd_label(int argc, char **argv)
 	}
 }
 
+static const char filesystem_cmd_group_info[] =
+"overall filesystem tasks and information";
+
 const struct cmd_group filesystem_cmd_group = {
-	filesystem_cmd_group_usage, NULL, {
-		{ "df", cmd_df, cmd_df_usage, NULL, 0 },
+	filesystem_cmd_group_usage, filesystem_cmd_group_info, {
+		{ "df", cmd_filesystem_df, cmd_filesystem_df_usage, NULL, 0 },
 		{ "show", cmd_show, cmd_show_usage, NULL, 0 },
 		{ "sync", cmd_sync, cmd_sync_usage, NULL, 0 },
 		{ "defragment", cmd_defrag, cmd_defrag_usage, NULL, 0 },
-		{ "balance", cmd_balance, NULL, &balance_cmd_group, 1 },
+		{ "balance", cmd_balance, NULL, &balance_cmd_group, CMD_HIDDEN },
 		{ "resize", cmd_resize, cmd_resize_usage, NULL, 0 },
 		{ "label", cmd_label, cmd_label_usage, NULL, 0 },
+		{ "usage", cmd_filesystem_usage,
+			cmd_filesystem_usage_usage, NULL, 0 },
+
 		NULL_CMD_STRUCT
 	}
 };