diff --git a/cmds-device.c b/cmds-device.c
index 800a050..94ba2f2 100644
--- a/cmds-device.c
+++ b/cmds-device.c
@@ -179,7 +179,7 @@ static const char * const cmd_scan_dev_usage[] = {
 static int cmd_scan_dev(int argc, char **argv)
 {
 	int	i, fd, e;
-	int	where = BTRFS_SCAN_PROC;
+	int	where = 0;
 	int	devstart = 1;
 
 	if( argc > 1 && !strcmp(argv[1],"--all-devices")){
@@ -193,14 +193,21 @@ static int cmd_scan_dev(int argc, char **argv)
 	if(argc<=devstart){
 		int ret;
 		printf("Scanning for Btrfs filesystems\n");
-		ret = scan_for_btrfs(where, 1);
-		if (ret){
-			fprintf(stderr, "ERROR: error %d while scanning\n", ret);
-			return 1;
-		}
+		if (where == BTRFS_SCAN_DEV) {
+			ret = scan_for_btrfs(BTRFS_SCAN_DEV,
+						BTRFS_UPDATE_KERNEL);
+			if (ret) {
+				fprintf(stderr,
+					"ERROR: %d while scanning\n", ret);
+				return 1;
+			}
+		} else
+			scan_for_btrfs_v2(BTRFS_UPDATE_KERNEL);
+
 		return 0;
 	}
 
+	/* if its here that means scan the specificed device/file */
 	fd = open("/dev/btrfs-control", O_RDWR);
 	if (fd < 0) {
 		perror("failed to open /dev/btrfs-control");
diff --git a/cmds-filesystem.c b/cmds-filesystem.c
index e1db9e7..80b6de1 100644
--- a/cmds-filesystem.c
+++ b/cmds-filesystem.c
@@ -22,6 +22,9 @@
 #include <errno.h>
 #include <uuid/uuid.h>
 #include <ctype.h>
+#include <mntent.h>
+#include <fcntl.h>
+#include <linux/limits.h>
 
 #include "kerncompat.h"
 #include "ctree.h"
@@ -212,8 +215,9 @@ static void print_one_uuid(struct btrfs_fs_devices *fs_devices)
 
 
 	total = device->total_devs;
-	printf(" uuid: %s\n\tTotal devices %llu FS bytes used %s\n", uuidbuf,
-	       (unsigned long long)total,
+
+	printf(" uuid: %s (unmounted)\n\tTotal devices %llu FS bytes used %s\n",
+		uuidbuf, (unsigned long long)total,
 	       pretty_size(device->super_bytes_used));
 
 	list_for_each(cur, &fs_devices->devices) {
@@ -232,10 +236,98 @@ static void print_one_uuid(struct btrfs_fs_devices *fs_devices)
 	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 *fi,
+		struct btrfs_ioctl_dev_info_args *di_n,
+		struct btrfs_ioctl_space_args *si_n, char *label, char *path)
+{
+	int i;
+	char uuidbuf[37];
+	struct btrfs_ioctl_dev_info_args *di = di_n;
+	u64 flags;
+
+	uuid_unparse(fi->fsid, uuidbuf);
+	printf("Label: %s  uuid: %s mounted: %s\n",
+		strlen(label) ? label : "none", uuidbuf, path);
+	printf("\tGroup profile:");
+	for (i = si_n->total_spaces - 1; i >= 0; i--) {
+		flags = si_n->spaces[i].flags;
+		if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
+			continue;
+		printf(" %s: %s", group_type_str(flags),
+					group_profile_str(flags));
+		printf(" ");
+	}
+	printf("\n");
+
+	printf("\tTotal devices %llu FS bytes used %s\n",
+				fi->num_devices,
+			pretty_size(calc_used_bytes(si_n)));
+
+	for (i = 0; i < fi->num_devices; i++) {
+		di = (struct btrfs_ioctl_dev_info_args *)&di_n[i];
+		printf("\tdevid    %llu size %s used %s path %s\n",
+			di->devid,
+			pretty_size(di->total_bytes),
+			pretty_size(di->bytes_used),
+			di->path);
+	}
+
+	printf("\n");
+	return 0;
+}
+
+static int btrfs_scan_kernel()
+{
+	int ret = 0, fd;
+	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;
+	char label[BTRFS_LABEL_SIZE];
+
+	f = setmntent("/proc/self/mounts", "r");
+	if (f == NULL)
+		return 1;
+
+	while ((mnt = getmntent(f)) != NULL) {
+		if (strcmp(mnt->mnt_type, "btrfs"))
+			continue;
+		ret = get_fs_info(mnt->mnt_dir, &fs_info_arg,
+				&dev_info_arg);
+		if (ret)
+			return ret;
+
+		fd = open(mnt->mnt_dir, O_RDONLY);
+		if (fd > 0 && !get_df(fd, &space_info_arg)) {
+			get_label_mounted(mnt->mnt_dir, label);
+			print_one_fs(&fs_info_arg, dev_info_arg,
+				space_info_arg, label, mnt->mnt_dir);
+			free(space_info_arg);
+		}
+		if (fd > 0)
+			close(fd);
+		free(dev_info_arg);
+	}
+	return ret;
+}
+
 static const char * const cmd_show_usage[] = {
-	"btrfs filesystem show [--all-devices|<uuid>]",
-	"Show the structure of a filesystem",
+	"btrfs filesystem show [--mounted|--all-devices [<uuid>]]",
+	"Show the structure of btrfs filesystem(s)",
 	"If no argument is given, structure of all present filesystems is shown.",
+	"--mounted  show only the mounted btrfs filesystem",
 	NULL
 };
 
@@ -246,34 +338,73 @@ static int cmd_show(int argc, char **argv)
 	struct list_head *cur_uuid;
 	char *search = NULL;
 	int ret;
-	int where = BTRFS_SCAN_PROC;
+	int where = 0;
 	int searchstart = 1;
 
 	if( argc > 1 && !strcmp(argv[1],"--all-devices")){
 		where = BTRFS_SCAN_DEV;
 		searchstart += 1;
+	} else if (argc > 1 && !strcmp(argv[1], "--mounted")) {
+		where = BTRFS_SCAN_MOUNTED;
+		searchstart += 1;
 	}
 
-	if (check_argc_max(argc, searchstart + 1))
-		usage(cmd_show_usage);
-
-	ret = scan_for_btrfs(where, 0);
-
-	if (ret){
-		fprintf(stderr, "ERROR: error %d while scanning\n", ret);
-		return 1;
+	if (where == BTRFS_SCAN_DEV) {
+		if (check_argc_max(argc, searchstart + 1))
+			usage(cmd_show_usage);
+	} else if (where == BTRFS_SCAN_MOUNTED) {
+		if (check_argc_max(argc, searchstart))
+			usage(cmd_show_usage);
+	} else {
+		if (check_argc_max(argc, searchstart))
+			usage(cmd_show_usage);
 	}
-	
+
 	if(searchstart < argc)
 		search = argv[searchstart];
 
-	all_uuids = btrfs_scanned_uuids();
-	list_for_each(cur_uuid, all_uuids) {
-		fs_devices = list_entry(cur_uuid, struct btrfs_fs_devices,
+	switch (where) {
+	case 0:
+		/* no option : show both mounted and unmounted
+		 */
+		/* mounted */
+		ret = btrfs_scan_kernel();
+		if (ret)
+			fprintf(stderr, "ERROR: scan kernel failed, %d\n",
+				ret);
+
+		/* unmounted */
+		scan_for_btrfs_v2(!BTRFS_UPDATE_KERNEL);
+		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);
+			print_one_uuid(fs_devices);
+		}
+		break;
+	case BTRFS_SCAN_DEV:
+		ret = scan_for_btrfs(BTRFS_SCAN_DEV, !BTRFS_UPDATE_KERNEL);
+		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);
+		}
+		break;
+	case BTRFS_SCAN_MOUNTED:
+		ret = btrfs_scan_kernel();
+		if (ret)
+			fprintf(stderr, "ERROR: scan kernel failed, %d\n",
+				ret);
+		break;
 	}
 	printf("%s\n", BTRFS_BUILD_VERSION);
 	return 0;
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index 61ffe8d..6a4f5bc 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -25,7 +25,7 @@ btrfs \- control a btrfs filesystem
 .PP
 \fBbtrfs\fP \fBfilesystem df\fP\fI <path>\fP
 .PP
-\fBbtrfs\fP \fBfilesystem show\fP [--all-devices|\fI<uuid>\fP|\fI<label>\fP]\fP
+\fBbtrfs\fP \fBfilesystem show\fP [\fI--mounted\fP|\fI--all-devices\fP|\fI<uuid>\fP]\fP
 .PP
 \fBbtrfs\fP \fBfilesystem sync\fP\fI <path> \fP
 .PP
@@ -51,7 +51,7 @@ btrfs \- control a btrfs filesystem
 .PP
 \fBbtrfs\fP \fBdevice delete\fP \fI<device>\fP [\fI<device>...\fP] \fI<path>\fP
 .PP
-\fBbtrfs\fP \fBdevice scan\fP [--all-devices|\fI<device> \fP[\fI<device>...\fP]
+\fBbtrfs\fP \fBdevice scan\fP [\fI--all-devices\fP|\fI<device> \P[\fI<device>...\fP]
 .PP
 \fBbtrfs\fP \fBdevice ready\fP\fI <device>\fP
 .PP
@@ -259,11 +259,12 @@ Show information of a given subvolume in the \fI<path>\fR.
 Show space usage information for a mount point.
 .TP
 
-\fBfilesystem show\fR [--all-devices|\fI<uuid>\fR|\fI<label>\fR]\fR
-Show the btrfs filesystem with some additional info. If no \fIUUID\fP or
-\fIlabel\fP is passed, \fBbtrfs\fR show info of all the btrfs filesystem.
+\fBfilesystem show\fR [\fI--mounted\fP|\fI--all-devices\fP|\fI<uuid>\fR]\fR
+Show the btrfs filesystem with some additional info. If no option or \fIUUID\fP
+is passed, \fBbtrfs\fR shows information of all the btrfs filesystem both mounted
+and unmounted.
+If \fB--mounted\fP is passed, it would probe btrfs kernel to list mounted btrfs filesystem(s);
 If \fB--all-devices\fP is passed, all the devices under /dev are scanned;
-otherwise the devices list is extracted from the /proc/partitions file.
 .TP
 
 \fBfilesystem sync\fR\fI <path> \fR
@@ -396,8 +397,8 @@ Remove device(s) from a filesystem identified by \fI<path>\fR.
 
 \fBdevice scan\fR [--all-devices|\fI<device> \fP[\fI<device>...\fP]\fR
 If one or more devices are passed, these are scanned for a btrfs filesystem. 
-If no devices are passed, \fBbtrfs\fR scans all the block devices listed
-in the /proc/partitions file.
+If no devices are passed, \fBbtrfs\fR uses block devices containing btrfs
+filesystem as listed by blkid.
 Finally, if \fB--all-devices\fP is passed, all the devices under /dev are 
 scanned.
 .TP
diff --git a/utils.c b/utils.c
index 134bf80..02a2658 100644
--- a/utils.c
+++ b/utils.c
@@ -685,9 +685,9 @@ int is_block_device(const char *path) {
  * Find the mount point for a mounted device.
  * On success, returns 0 with mountpoint in *mp.
  * On failure, returns -errno (not mounted yields -EINVAL)
- * Is noisy on failures, expects to be given a mounted device.
  */
-static int get_btrfs_mount(const char *dev, char *mp, size_t mp_size) {
+int get_btrfs_mount(const char *dev, char *mp, size_t mp_size)
+{
 	int ret;
 	int fd = -1;
 
@@ -712,7 +712,6 @@ static int get_btrfs_mount(const char *dev, char *mp, size_t mp_size) {
 
 	ret = check_mounted_where(fd, dev, mp, mp_size, NULL);
 	if (!ret) {
-		fprintf(stderr, "%s is not a mounted btrfs device\n", dev);
 		ret = -EINVAL;
 	} else { /* mounted, all good */
 		ret = 0;
@@ -1144,6 +1143,56 @@ fail:
 	return ret;
 }
 
+int test_skip_this_disk(char *path)
+{
+	int fd;
+	/* this will eliminate disks which are mounted (btrfs)
+	 * and non-dm disk path when dm is enabled
+	 */
+	fd = open(path, O_RDWR|O_EXCL);
+	if (fd < 0)
+		return 1;
+	close(fd);
+	return 0;
+}
+
+void scan_for_btrfs_v2(int update_kernel)
+{
+	int fd = -1;
+	u64 num_devices;
+	struct btrfs_fs_devices *tmp_devices;
+	blkid_dev_iterate iter = NULL;
+	blkid_dev dev = NULL;
+	blkid_cache cache = NULL;
+	char path[PATH_MAX];
+
+	if (blkid_get_cache(&cache, 0) < 0) {
+		printf("ERROR: lblkid cache get failed\n");
+		return;
+	}
+	blkid_probe_all(cache);
+	iter = blkid_dev_iterate_begin(cache);
+	blkid_dev_set_search(iter, "TYPE", "btrfs");
+	while (blkid_dev_next(iter, &dev) == 0) {
+		dev = blkid_verify(cache, dev);
+		if (!dev)
+			continue;
+		/* if we are here its definitly a btrfs disk*/
+		strcpy(path, blkid_dev_devname(dev));
+		if (test_skip_this_disk(path))
+			continue;
+
+		fd = open(path, O_RDONLY);
+		btrfs_scan_one_device(fd, path, &tmp_devices,
+				&num_devices, BTRFS_SUPER_INFO_OFFSET);
+		close(fd);
+		fd = -1;
+		if (update_kernel)
+			btrfs_register_one_device(path);
+	}
+	blkid_dev_iterate_end(iter);
+}
+
 int btrfs_scan_for_fsid(int run_ioctls)
 {
 	int ret;
diff --git a/utils.h b/utils.h
index 6c2553a..616bae1 100644
--- a/utils.h
+++ b/utils.h
@@ -27,6 +27,9 @@
 
 #define BTRFS_SCAN_PROC	1
 #define BTRFS_SCAN_DEV		2
+#define BTRFS_SCAN_MOUNTED	3
+
+#define BTRFS_UPDATE_KERNEL	1
 
 int make_btrfs(int fd, const char *device, const char *label,
 	       u64 blocks[6], u64 num_bytes, u32 nodesize,
@@ -74,10 +77,12 @@ u64 btrfs_device_size(int fd, struct stat *st);
 #define strncpy_null(dest, src) __strncpy__null(dest, src, sizeof(dest))
 int test_dev_for_mkfs(char *file, int force_overwrite, char *estr);
 int scan_for_btrfs(int where, int update_kernel);
+void scan_for_btrfs_v2(int update_kernel);
 int get_label_mounted(const char *mount_path, char *labelp);
 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
 	u64 dev_cnt, int mixed, char *estr);
 int is_vol_small(char *file);
 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
 			   int verify);
+int get_btrfs_mount(const char *dev, char *mp, size_t mp_size);
 #endif
