diff --git a/Makefile b/Makefile
index 636cbf0..70eaf57 100644
--- a/Makefile
+++ b/Makefile
@@ -56,7 +56,7 @@ btrfs_convert_libs = -lext2fs -lcom_err
 btrfs_image_libs = -lpthread
 btrfs_fragment_libs = -lgd -lpng -ljpeg -lfreetype
 
-SUBDIRS = man
+SUBDIRS = Documentation
 BUILDDIRS = $(patsubst %,build-%,$(SUBDIRS))
 INSTALLDIRS = $(patsubst %,install-%,$(SUBDIRS))
 CLEANDIRS = $(patsubst %,clean-%,$(SUBDIRS))
@@ -221,7 +221,7 @@ send-test: $(objects) $(libs) send-test.o
 	$(Q)$(CC) $(CFLAGS) -o send-test $(objects) send-test.o $(LDFLAGS) $(LIBS) -lpthread
 
 manpages:
-	$(Q)$(MAKE) $(MAKEOPTS) -C man
+	$(Q)$(MAKE) $(MAKEOPTS) -C Documentation
 
 clean: $(CLEANDIRS)
 	@echo "Cleaning"
diff --git a/man/Makefile b/man/Makefile
deleted file mode 100644
index 552c9f7..0000000
--- a/man/Makefile
+++ /dev/null
@@ -1,31 +0,0 @@
-GZIPCMD=gzip
-INSTALL= install
-
-prefix ?= /usr/local
-bindir = $(prefix)/bin
-mandir = $(prefix)/man
-man8dir = $(mandir)/man8
-
-# clear out all suffixes
-.SUFFIXES:
-# list only those we use
-.SUFFIXES: .in .gz
-
-MANPAGES = mkfs.btrfs.8.gz btrfsck.8.gz btrfs-image.8.gz btrfs.8.gz \
-	   btrfs-debug-tree.8.gz btrfs-show-super.8.gz btrfs-find-root.8.gz \
-	   btrfs-convert.8.gz btrfstune.8.gz btrfs-zero-log.8.gz btrfs-map-logical.8.gz \
-	   fsck.btrfs.8.gz
-INFILES = ${MANPAGES:.in=.gz}
-
-all: $(MANPAGES)
-
-.in.gz :
-	@echo "    [MAN]    $@"
-	$(Q)$(GZIPCMD) -n -c $< > $@
-
-clean :
-	$(Q)rm -f $(MANPAGES)
-
-install: $(MANPAGES)
-	$(INSTALL) -m755 -d $(DESTDIR)$(man8dir)
-	$(INSTALL) -m 644 $(MANPAGES) $(DESTDIR)$(man8dir)
diff --git a/man/btrfs-convert.8.in b/man/btrfs-convert.8.in
deleted file mode 100644
index 85cfa61..0000000
--- a/man/btrfs-convert.8.in
+++ /dev/null
@@ -1,33 +0,0 @@
-.TH BTRFS-CONVERT 8
-.SH NAME
-btrfs-convert \- convert ext2/3/4 to btrfs.
-.SH SYNOPSIS
-.B btrfs-convert [\fIoptions\fP] \fI<dev>\fP
-.SH DESCRIPTION
-\fBbtrfs-convert\fP is used to convert existed ext2/3/4 to btrfs filesystem, and the original filesystem image is accessible as from separate subvolume named ext2_subvol as file image.
-
-\fIOptions\fP
-.IP "\fB-d\fP" 5
-disable data checksum.
-.IP "\fB-i\fP" 5
-ignore xattrs and ACLs.
-.IP "\fB-n\fP" 5
-disable packing of small files.
-.IP "\fB-r\fP" 5
-roll back to ext2fs.
-
-.SH EXIT CODE
-\fBbtrfs-convert\fP will return 0 if no error happened.
-If any problems happened, 1 will be returned.
-
-.SH AUTHOR
-Written by Shilong Wang and Wenruo Qu.
-
-.SH COPYRIGHT
-Copyright \(co 2013 FUJITSU LIMITED.
-License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
-.br
-This is free software: you are free  to  change  and  redistribute  it. There is NO WARRANTY, to the extent permitted by law.
-
-.SH SEE ALSO
-.BR mkfs.btrfs (8)
diff --git a/man/btrfs-debug-tree.8.in b/man/btrfs-debug-tree.8.in
deleted file mode 100644
index eed7097..0000000
--- a/man/btrfs-debug-tree.8.in
+++ /dev/null
@@ -1,35 +0,0 @@
-.TH BTRFS-DEBUG-TREE 8
-.SH NAME
-btrfs-debug-tree \- dump Btrfs filesystem metadata into stdout.
-.SH SYNOPSIS
-.B btrfs-debug-tree [\fIoptions\fP] \fI<device>\fP
-.SH DESCRIPTION
-\fBbtrfs-debug-tree\fP is used to dump the whole tree of the given device.
-This is maybe useful for analyzing filesystem state or inconsistence and has
-a positive educational effect on understanding the internal structure.
-\fIdevice\fP is the device file where the filesystem is stored.
-
-\fIOptions\fP
-.IP "\fB-e\fP" 5
-print detailed extents info.
-.IP "\fB-d\fP" 5
-print info of btrfs device and root tree dirs only.
-.IP "\fB-r\fP" 5
-print info of roots only.
-.IP "\fB-b \fI<block_num>\fP" 5
-print info of the specified block only.
-
-.SH EXIT CODE
-\fBbtrfs-debug-tree\fP will return 0 if no error happened.
-If any problems happened, 1 will be returned.
-
-.SH AUTHOR
-Written by Shilong Wang and Wenruo Qu.
-
-.SH COPYRIGHT
-Copyright \(co 2013 FUJITSU LIMITED.
-License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
-.br
-This is free software: you are free  to  change  and  redistribute  it. There is NO WARRANTY, to the extent permitted by law.
-.SH SEE ALSO
-.BR mkfs.btrfs (8)
diff --git a/man/btrfs-find-root.8.in b/man/btrfs-find-root.8.in
deleted file mode 100644
index c1f48a0..0000000
--- a/man/btrfs-find-root.8.in
+++ /dev/null
@@ -1,30 +0,0 @@
-.TH BTRFS-FIND-ROOT 8
-.SH NAME
-btrfs-find-root \- filter to find btrfs root.
-.SH SYNOPSIS
-.B btrfs-find-root [\fIoptions\fP] \fI<dev>\fP
-.SH DESCRIPTION
-\fBbtrfs-find-root\fP is used to find the satisfied root, you can filter by root tree's objectid, generation, level.
-
-\fIOptions\fP
-.IP "\fB-g \fI<generation>\fP" 5
-filter root tree by it's original transaction id, tree root's generation in default.
-.IP "\fB-o \fI<objectid>\fP" 5
-filter root tree by it's objectid,tree root's objectid in default.
-.IP "\fB-l \fI<level>\fP" 5
-filter root tree by B-+ tree's level, level 0 in default.
-
-.SH EXIT CODE
-\fBbtrfs-find-root\fP will return 0 if no error happened.
-If any problems happened, 1 will be returned.
-
-.SH AUTHOR
-Written by Shilong Wang and Wenruo Qu.
-
-.SH COPYRIGHT
-Copyright \(co 2013 FUJITSU LIMITED.
-License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
-.br
-This is free software: you are free  to  change  and  redistribute  it. There is NO WARRANTY, to the extent permitted by law.
-.SH SEE ALSO
-.BR mkfs.btrfs (8)
diff --git a/man/btrfs-image.8.in b/man/btrfs-image.8.in
deleted file mode 100644
index 3f51f3f..0000000
--- a/man/btrfs-image.8.in
+++ /dev/null
@@ -1,55 +0,0 @@
-.TH BTRFS-IMAGE 8
-.SH NAME
-btrfs-image \- create/restore an image of the filesystem
-.SH SYNOPSIS
-.B btrfs-image
-[options] \fIsource\fP \fItarget\fP
-.SH DESCRIPTION
-.B btrfs-image
-is used to create an image of a btrfs filesystem. All data will be zeroed,
-but metadata and the like is preserved.
-.I source
-is the special file corresponding to the device containing a btrfs filesystem.
-(e.g \fI/dev/sdXX\fP).
-.I target
-is the image file that btrfs-image creates. When used with \fB-r\fP option,
-\fBbtrfs-image\fP restores the image file from source into target.
-.SH OPTIONS
-.TP
-\fB\-r\fP
-Restore metadump image. By default, this fixes super's chunk tree, by
-using 1 stripe pointing to primary device, so that file system can be
-restored by running tree log reply if possible. To restore without
-changing number of stripes in chunk tree check \fB-o\fP option.
-.TP
-\fB\-c\fR \fIvalue\fP
-compression level (0 ~ 9).
-.TP
-\fB\-t\fR \fIvalue\fP
-number of threads (1 ~ 32) to be used to process the image dump or restore.
-.TP
-\fB\-o\fP
-use the old restore method, this does not fixup the chunk tree so the restored
-file system will not be able to be mounted.
-.TP
-\fB\-s\fP
-Sanitize the file names when generating the image. One \fB-s\fP means just
-generate random garbage, which means that the directory indexes won't match up
-since the hashes won't match with the garbage filenames. Using \fB-ss\fP will
-calculate a collision for the filename so that the hashes match, and if it
-can't calculate a collision then it will just generate garbage.  The collision
-calculator is very time and CPU intensive so only use it if you are having
-problems with your file system tree and need to have it mostly working.
-.TP
-\fB\-w\fP
-Walk all the trees manually and copy any blocks that are referenced. Use this
-option if your extent tree is corrupted to make sure that all of the metadata is
-captured.
-.SH AVAILABILITY
-.B btrfs-image
-is part of btrfs-progs. Btrfs is currently under heavy development,
-and not suitable for any uses other than benchmarking and review.
-Please refer to the btrfs wiki
-http://btrfs.wiki.kernel.org for further details.
-.SH SEE ALSO
-.BR btrfsck (8), mkfs.btrfs (8)
diff --git a/man/btrfs-map-logical.8.in b/man/btrfs-map-logical.8.in
deleted file mode 100644
index a253051..0000000
--- a/man/btrfs-map-logical.8.in
+++ /dev/null
@@ -1,33 +0,0 @@
-.TH BTRFS-MAP-LOGICAL 8
-.SH NAME
-btrfs-map-logical \- map btrfs logical extent to physical extent
-.SH SYNOPSIS
-.B btrfs-map-logical [\fIoptions\fP] \fI<device>\fP
-.SH DESCRIPTION
-\fBbtrfs-map-logical\fP can be used to find out what the physical offsets are
-on the mirrors, the result is dumped into stdout in default.
-
-\fIOptions\fP
-.IP "\fB-l|--logical \fI<logical_num>\fP" 5
-Logical extent to map.
-.IP "\fB-c|--copy \fI<copy>\fP" 5
-Copy of the extent to read(usually 1 or 2).
-.IP "\fB-o|--output \fI<filename>\fP" 5
-Output file to hold the extent.
-.IP "\fB-b|--bytes \fI<bytes>\fP" 5
-Number of bytes to read.
-
-.SH EXIT CODE
-\fBbtrfs-map-logical\fP will return 0 if no error happened.
-If any problems happened, 1 will be returned.
-
-.SH AUTHOR
-Written by Shilong Wang and Wenruo Qu.
-
-.SH COPYRIGHT
-Copyright \(co 2013 FUJITSU LIMITED.
-License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
-.br
-This is free software: you are free  to  change  and  redistribute  it. There is NO WARRANTY, to the extent permitted by law.
-.SH SEE ALSO
-.BR mkfs.btrfs (8)
diff --git a/man/btrfs-show-super.8.in b/man/btrfs-show-super.8.in
deleted file mode 100644
index 3fe8bde..0000000
--- a/man/btrfs-show-super.8.in
+++ /dev/null
@@ -1,30 +0,0 @@
-.TH BTRFS-SHOW-SUPER 8
-.SH NAME
-btrfs-show-super \- show btrfs superblock information stored in devices
-.SH SYNOPSIS
-.B btrfs-show-super [\fIoptions\fP] \fI<dev>\fP [\fI<dev>...\fP]
-.SH DESCRIPTION
-\fBbtrfs-show-super\fP is used to print the information of superblock,
-you can specify which mirror to print out. In default, every device's
-first superblock will be printed out.
-
-\fIOptions\fP
-.IP "\fB-a\fP" 5
-print all the superblock information, if this option is given, '\fB-i\fP' option will be ignored.
-.IP "\fB-i \fI<super_mirror>\fP" 5
-specify which mirror to print out. \fI<super_mirror>\fP is between 0 and 2. if several '\fB-i \fI<super_mirror>\fP'\fR are given, only the last one is valid.
-
-.SH EXIT CODE
-\fBbtrfs-show-super\fR will return 0 exit code if no error happened.
-If any problems happened, 1 will be returned.
-
-.SH AUTHOR
-Written by Shilong Wang and Wenruo Qu.
-
-.SH COPYRIGHT
-Copyright \(co 2013 FUJITSU LIMITED.
-License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
-.br
-This is free software: you are free  to  change  and  redistribute  it. There is NO WARRANTY, to the extent permitted by law.
-.SH SEE ALSO
-.BR mkfs.btrfs (8)
diff --git a/man/btrfs-zero-log.8.in b/man/btrfs-zero-log.8.in
deleted file mode 100644
index 0ccfb0e..0000000
--- a/man/btrfs-zero-log.8.in
+++ /dev/null
@@ -1,23 +0,0 @@
-.TH BTRFS-ZERO-LOG 8
-.SH NAME
-btrfs-zero-log \- clear out log tree.
-.SH SYNOPSIS
-.B btrfs-zero-log \fI <dev>\fP
-.SH DESCRIPTION
-\fBbtrfs-zero-log\fP will remove the log tree if log tree is corrupt, which will allow you to mount the filesystem again. The common case where this
-happens has been fixed a long time ago, so it is unlikely that you will see this particular problem.
-
-.SH EXIT CODE
-\fBbtrfs-zero-log\fR will return 0 exit code if no error happened.
-Other exit code means some problems happened.
-
-.SH AUTHOR
-Written by Shilong Wang and Wenruo Qu.
-
-.SH COPYRIGHT
-Copyright \(co 2013 FUJITSU LIMITED.
-License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
-.br
-This is free software: you are free  to  change  and  redistribute  it. There is NO WARRANTY, to the extent permitted by law.
-.SH SEE ALSO
-.BR mkfs.btrfs (8)
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
deleted file mode 100644
index 2b36b26..0000000
--- a/man/btrfs.8.in
+++ /dev/null
@@ -1,932 +0,0 @@
-.TH BTRFS 8 "" "btrfs" "btrfs"
-.\"
-.\" Man page written by Goffredo Baroncelli <kreijack@inwind.it> (Feb 2010)
-.\" Modified by Qu Wenruo <quwenruo@cn.fujitsu.com> (Jun 2013)
-.\"
-.SH NAME
-btrfs \- control a btrfs filesystem
-.SH SYNOPSIS
-\fBbtrfs\fP \fBsubvolume create\fP [-i \fI<qgroupid>\fP] [\fI<dest>\fP/]\fI<name>\fP
-.PP
-\fBbtrfs\fP \fBsubvolume delete\fP [\fIoptions\fP] \fI<subvolume>\fP [\fI<subvolume>...\fP]
-.PP
-\fBbtrfs\fP \fBsubvolume list\fP [\fIoptions\fP] [-G [+|-]\fIvalue\fP] [-C [+|-]\fIvalue\fP] [--sort=rootid,gen,ogen,path] \fI<path>\fP
-.PP
-\fBbtrfs\fP \fBsubvolume snapshot\fP [-r] [-i qgroupid] \fI<source>\fP \fI<dest>\fP|[\fI<dest>\fP/]\fI<name>\fP
-.PP
-\fBbtrfs\fP \fBsubvolume snapshot\fP [-r] [-i qgroupid] \fI-s <subvolid>\fP \fI<dest>/<name>\fP
-.PP
-\fBbtrfs\fP \fBsubvolume get-default\fP\fI <path>\fP
-.PP
-\fBbtrfs\fP \fBsubvolume set-default\fP\fI <id> <path>\fP
-.PP
-\fBbtrfs\fP \fBsubvolume find-new\fP\fI <subvolume> <lastgen>\fP
-.PP
-\fBbtrfs\fP \fBsubvolume show\fP\fI <path>\fP
-.PP
-.PP
-\fBbtrfs\fP \fBfilesystem df\fP\fI [-b] \fIpath [path..]\fR\fP
-.PP
-\fBbtrfs\fP \fBfilesystem show\fP [\fI--mounted\fP|\fI--all-devices\fP|\fI<path>\fP|\fI<uuid>\fP|\fI<device>\fP|\fI<lable>\fP]\fP
-.PP
-\fBbtrfs\fP \fBfilesystem sync\fP\fI <path> \fP
-.PP
-\fBbtrfs\fP \fBfilesystem defragment\fP [\fIoptions\fP] \fI<file>\fP|\fI<dir>\fP [\fI<file>\fP|\fI<dir>...\fP]\fP
-.PP
-\fBbtrfs\fP \fBfilesystem resize\fP [\fIdevid\fP:][+/\-]\fI<size>\fP[gkm]|[\fIdevid\fP:]\fImax <path>\fP
-.PP
-\fBbtrfs\fP \fBfilesystem label\fP [\fI<device>\fP|\fI<mount_point>\fP] [\fI<newlabel>\fP]
-.PP
-\fBbtrfs\fP \fBfilesystem disk-usage [-tb]\fP\fI <path> 
-[path..]\fP
-.PP
-.PP
-\fBbtrfs\fP \fB[filesystem] balance\fP\fI <path> \fP
-.PP
-\fBbtrfs\fP \fB[filesystem] balance start\fP [\fIoptions\fP] \fI<path>\fP
-.PP
-\fBbtrfs\fP \fB[filesystem] balance pause\fP\fI <path>\fP
-.PP
-\fBbtrfs\fP \fB[filesystem] balance cancel\fP\fI <path>\fP
-.PP
-\fBbtrfs\fP \fB[filesystem] balance resume\fP\fI <path>\fP
-.PP
-\fBbtrfs\fP \fB[filesystem] balance status\fP [-v] \fI<path>\fP
-.PP
-.PP
-\fBbtrfs\fP \fBdevice add\fP [-Kf] \fI<device>\fP [\fI<device>...\fP] \fI<path>\fP
-.PP
-\fBbtrfs\fP \fBdevice delete\fP \fI<device>\fP [\fI<device>...\fP] \fI<path>\fP
-.PP
-\fBbtrfs\fP \fBdevice scan\fP [(\fI-d\fP|\fI--all-devices\fP)|\fI<device>\fP [\fI<device>...\fP]]
-.PP
-\fBbtrfs\fP \fBdevice disk-usage\fP\fI [-b] <path> [<path>...] \fP
-.PP
-\fBbtrfs\fP \fBdevice ready\fP\fI <device>\fP
-.PP
-\fBbtrfs\fP \fBdevice stats\fP [-z] {\fI<path>\fP|\fI<device>\fP}
-.PP
-.PP
-\fBbtrfs\fP \fBscrub start\fP [-BdqrRf] [-c \fIioprio_class\fP -n \fIioprio_classdata\fP] {\fI<path>\fP|\fI<device>\fP}
-.PP
-\fBbtrfs\fP \fBscrub cancel\fP {\fI<path>\fP|\fI<device>\fP}
-.PP
-\fBbtrfs\fP \fBscrub resume\fP [-BdqrR] [-c \fIioprio_class\fP -n \fIioprio_classdata\fP] {\fI<path>\fP|\fI<device>\fP}
-.PP
-\fBbtrfs\fP \fBscrub status\fP [-d] {\fI<path>\fP|\fI<device>\fP}
-.PP
-.PP
-\fBbtrfs\fP \fBcheck\fP [\fIoptions\fP] \fI<device>\fP
-.PP
-\fBbtrfs\fP \fBrescue chunk-recover\fP [\fIoptions\fP] \fI<device>\fP
-.PP
-\fBbtrfs\fP \fBrescue super-recover\fP [\fIoptions\fP] \fI<device>\fP
-.PP
-\fBbtrfs\fP \fBrestore\fP [\fIoptions\fP] \fI<device>\fP \fI<path>\fP | -l \fI<device>\fP
-.PP
-.PP
-\fBbtrfs\fP \fBinspect-internal inode-resolve\fP [-v] \fI<inode>\fP \fI<path>\fP
-.PP
-\fBbtrfs\fP \fBinspect-internal logical-resolve\fP [-Pv] [-s \fI<size>\fP] \fI<logical>\fP \fI<path>\fP
-.PP
-\fBbtrfs\fP \fBinspect-internal subvolid-resolve\fP \fI<subvolid>\fP \fI<path>\fP
-.PP
-\fBbtrfs\fP \fBinspect-internal rootid\fP \fI<path>\fP
-.PP
-.PP
-\fBbtrfs\fP \fBsend\fP [-ve] [-p \fI<parent>\fP] [-c \fI<clone-src>\fP] [-f \fI<outfile>\fP] \fI<subvol>\fP [\fI<subvol>\fP...]
-.PP
-\fBbtrfs\fP \fBreceive\fP [-ve] [-f \fI<infile>\fP] \fI<mount>\fP
-.PP
-.PP
-\fBbtrfs\fP \fBquota enable\fP\fI <path>\fP
-.PP
-\fBbtrfs\fP \fBquota disable\fP\fI <path>\fP
-.PP
-\fBbtrfs\fP \fBquota rescan\fP [-sw] \fI<path>\fP
-.PP
-.PP
-\fBbtrfs\fP \fBqgroup assign\fP \fI<src>\fP \fI<dst>\fP \fI<path>\fP
-.PP
-\fBbtrfs\fP \fBqgroup remove\fP \fI<src>\fP \fI<dst>\fP \fI<path>\fP
-.PP
-\fBbtrfs\fP \fBqgroup create\fP \fI<qgroupid>\fP \fI<path>\fP
-.PP
-\fBbtrfs\fP \fBqgroup destroy\fP \fI<qgroupid>\fP \fI<path>\fP
-.PP
-\fBbtrfs\fP \fBqgroup show\fP [\fIoptions\fP] \fI<path>\fP
-.PP
-\fBbtrfs\fP \fBqgroup limit\fP [\fIoptions\fP] \fI<size>\fP|\fBnone\fP [\fI<qgroupid>\fP] \fI<path>\fP
-.PP
-.PP
-\fBbtrfs\fP \fBreplace start\fP [-Bfr] \fI<srcdev>\fP|\fI<devid> <targetdev> <mount_point>\fP
-.PP
-\fBbtrfs\fP \fBreplace status\fP [-1] \fI<mount_point>\fP
-.PP
-\fBbtrfs\fP \fBreplace cancel\fP \fI<mount_point>\fP
-.PP
-\fBbtrfs\fP \fBdedup enable <path> \fP\fI\fP
-.PP
-\fBbtrfs\fP \fBdedup disable <path> \fP\fI\fP
-.PP
-\fBbtrfs\fP \fBdedup on [-b|--bs size] <path> \fP\fI\fP
-.PP
-\fBbtrfs\fP \fBdedup off <path> \fP\fI\fP
-.PP
-\fBbtrfs\fP \fBhelp|\-\-help \fP
-.PP
-\fBbtrfs\fP \fB<command> \-\-help \fP
-.PP
-.SH DESCRIPTION
-.B btrfs
-is used to control the filesystem and the files and directories stored. It is
-the tool to create or destroy a snapshot or a subvolume for the
-filesystem, to defrag a file or a directory, flush the data to the disk,
-to resize the filesystem, to scan the device.
-
-It is possible to abbreviate the commands unless the commands are ambiguous.
-For example: it is possible to run
-.I btrfs sub snaps
-instead of
-.I btrfs subvolume snapshot.
-But
-.I btrfs file s
-is not allowed, because
-.I file s
-may be interpreted both as
-.I filesystem show
-and as
-.I filesystem sync.
-In this case
-.I btrfs
-returns filesystem sync
-If a command is terminated by
-.I --help
-, the detailed help is showed. If the passed command matches more commands,
-detailed help of all the matched commands is showed. For example
-.I btrfs dev --help
-shows the help of all
-.I device*
-commands.
-
-.SH COMMANDS
-.TP
-
-\fBsubvolume create\fP [-i \fI<qgroupid>\fP] [\fI<dest>\fP/]\fI<name>\fP
-Create a subvolume \fI<name>\fR in \fI<dest>\fR.
-If \fI<dest>\fR is not given subvolume \fI<name>\fR will be created in the
-current directory.
-.RS
-
-\fIOptions\fP
-.IP "\fB-i\fP \fI<qgroupid>\fR" 5
-Add the newly created subvolume to a qgroup. This option can be given multiple
-times.
-.RE
-.TP
-
-\fBsubvolume delete\fR [\fIoptions\fP] \fI<subvolume>\fP [\fI<subvolume>...\fP]\fR
-Delete the subvolume(s) from the filesystem. If \fI<subvolume>\fR is not a
-subvolume, \fBbtrfs\fR returns an error but continues if there are more arguments
-to process.
-
-The corresponding directory is removed instantly but the data blocks are
-removed later.  The deletion does not involve full commit by default due to
-performance reasons (as a consequence, the subvolume may appear again after a
-crash).  Use one of the --commit options to wait until the operation is safely
-stored on the media.
-.RS
-
-\fIOptions\fP
-.IP "\fB-c|--commit-after\fP" 5
-wait for transaction commit at the end of the operation
-.IP "\fB-C|--commit-each\fP" 5
-wait for transaction commit after deleting each subvolume
-.RE
-.TP
-
-\fBsubvolume list\fR [\fIoptions\fP] [-G [+|-]\fIvalue\fP] [-C [+|-]\fIvalue\fP] [--sort=rootid,gen,ogen,path] \fI<path>\fR
-
-List the subvolumes present in the filesystem \fI<path>\fR. For every
-subvolume the following information is shown by default.
-ID \fI<ID>\fP top level \fI<ID>\fP path \fI<path>\fP
-where path is the relative path of the subvolume to the \fItop level\fR
-subvolume.
-
-The subvolume's ID may be used by the \fBsubvolume set-default\fR command, or
-at mount time via the \fIsubvolid=\fR option.
-If \fI-p\fR is given, then \fIparent <ID>\fR is added to the output between ID
-and top level. The parent's ID may be used at mount time via the
-\fIsubvolrootid=\fR option.
-.RS
-
-\fIOptions\fP
-.IP "\fB-p\fP" 5
-print parent ID.
-.IP "\fB-a\fP" 5
-print all the subvolumes in the filesystem and distinguish between
-absolute and relative path with respect to the given \fI<path>\fP.
-.IP "\fB-c\fP" 5
-print the ogeneration of the subvolume, aliases: ogen or origin generation.
-.IP "\fB-g\fP" 5
-print the generation of the subvolume.
-.IP "\fB-o\fP" 5
-print only subvolumes bellow specified <path>.
-.IP "\fB-u\fP" 5
-print the UUID of the subvolume.
-.IP "\fB-q\fP" 5
-print the parent uuid of subvolumes (and snapshots).
-.IP "\fB-t\fP" 5
-print the result as a table.
-.IP "\fB-s\fP" 5
-only snapshot subvolumes in the filesystem will be listed.
-.IP "\fB-r\fP" 5
-only readonly subvolumes in the filesystem will be listed.
-.IP "\fB-G [+|-]\fIvalue\fP\fP" 5
-list subvolumes in the filesystem that its generation is
->=, <= or = \fIvalue\fP. '+' means >= \fIvalue\fP, '-' means <= \fIvalue\fP, If there is
-neither '+' nor '-', it means = \fIvalue\fP.
-.IP "\fB-C [+|-]\fIvalue\fP" 5
-list subvolumes in the filesystem that its ogeneration is
->=, <= or = \fIvalue\fP. The usage is the same to '-g' option.
-.IP "\fB--sort=rootid,gen,ogen,path\fP" 5
-list subvolumes in order by specified items.
-you can add '+' or '-' in front of each items, '+' means ascending, '-'
-means descending. The default is ascending.
-
-for \fB--sort\fP you can combine some items together by ',', just like
-\f--sort=+ogen,-gen,path,rootid\fR.
-.RE
-.TP
-
-\fBsubvolume snapshot\fP [-r] [-i qgroupid] \fI<source>\fP \fI<dest>\fP|[\fI<dest>\fP/]\fI<name>\fP
-Create a writable/readonly snapshot of the subvolume \fI<source>\fR with the
-name \fI<name>\fR in the \fI<dest>\fR directory.
-If only \fI<dest>\fR is given, the subvolume will be named the basename of \fI<source>\fR.
-If \fI<source>\fR is not a subvolume, \fBbtrfs\fR returns an error.
-.RS
-
-\fIOptions\fP
-.IP \fB-r\fP 5
-The newly created snapshot will be readonly.
-.IP "\fB-i\fP \fI<qgroupid>\fR" 5
-Add the newly created subvolume to a qgroup. This option can be given multiple
-times.
-.RE
-.TP
-
-\fBsubvolume snapshot\fP [-r] [-i qgroupid] \fI-s <subvolid>\fP \fI<dest>\fP/\fI<name>\fP
-Create a writable/readonly snapshot of the subvolume \fI<subvolid>\fR with the
-name \fI<name>\fR in the \fI<dest>\fR directory.
-If \fI<subvolid>\fR does not refer to a subvolume, \fBbtrfs\fR returns an error.
-.RS
-
-\fIOptions\fP
-.IP \fB-r\fP 5
-The newly created snapshot will be readonly.
-.IP "\fB-i\fP \fI<qgroupid>\fR" 5
-Add the newly created subvolume to a qgroup. This option can be given multiple
-times.
-.RE
-.TP
-
-\fBsubvolume get-default\fR\fI <path>\fR
-Get the default subvolume of the filesystem \fI<path>\fR. The output format
-is similar to \fBsubvolume list\fR command.
-.TP
-
-\fBsubvolume set-default\fR\fI <id> <path>\fR
-Set the subvolume of the filesystem \fI<path>\fR which is mounted as
-\fIdefault\fR. The subvolume is identified by \fI<id>\fR, which
-is returned by the \fBsubvolume list\fR command.
-.TP
-
-\fBsubvolume find-new\fR\fI <subvolume> <last_gen>\fR
-List the recently modified files in a subvolume, after \fI<last_gen>\fR ID.
-.TP
-
-\fBsubvolume show\fR\fI <path>\fR
-Show information of a given subvolume in the \fI<path>\fR.
-.TP
-
-\fBfilesystem df\fP [-b] \fIpath [path..]\fR
-
-Show space usage information for a mount point.
-
-\fB-b\fP Set byte as unit
-
-The command \fBbtrfs filesystem df\fP is used to query how many space on the 
-disk(s) are used and an estimation of the free
-space of the filesystem.
-The output of the command \fBbtrfs filesystem df\fP shows:
-
-.RS
-.IP \fBDisk\ size\fP
-the total size of the disks which compose the filesystem.
-
-.IP \fBDisk\ allocated\fP
-the size of the area of the disks used by the chunks.
-
-.IP \fBDisk\ unallocated\fP 
-the size of the area of the disks which is free (i.e.
-the differences of the values above).
-
-.IP \fBUsed\fP
-the portion of the logical space used by the file and metadata.
-
-.IP \fBFree\ (estimated)\fP
-the estimated free space available: i.e. how many space can be used
-by the user. The evaluation 
-cannot be rigorous because it depends by the allocation policy (DUP, Single,
-RAID1...) of the metadata and data chunks. If every chunk is stored as
-"Single" the sum of the \fBfree (estimated)\fP space and the \fBused\fP 
-space  is equal to the \fBdisk size\fP.
-Otherwise if all the chunk are mirrored (raid1 or raid10) or duplicated
-the sum of the \fBfree (estimated)\fP space and the \fBused\fP space is
-half of the \fBdisk size\fP. Normally the \fBfree (estimated)\fP is between
-these two limits.
-
-.IP \fBData\ to\ disk\ ratio\fP
-the ratio betwen the \fBlogical size\fP (i.e. the space available by
-the chunks) and the \fBdisk allocated\fP (by the chunks). Normally it is 
-lower than 100% because the metadata is duplicated for security reasons.
-If all the data and metadata are duplicated (or have a profile like RAID1)
-the \fBData\ to\ disk\ ratio\fP could be 50%.
-.RE
-.TP
-
-\fBfilesystem show\fR [\fI--mounted\fP|\fI--all-devices\fP|\fI<path>\fP|\fI<uuid>\fP|\fI<device>\fP|\fI<lable>\fP]\fR
-Show the btrfs filesystem with some additional info. If no option or
-\fIPATH\fP|\fIUUID\fP|\fIDEVICE\fP|\fILABEL\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
-Force a sync for the filesystem identified by \fI<path>\fR.
-.TP
-
-\fBfilesystem defragment\fP [\fIoptions\fP] \fI<file>\fP|\fI<dir>\fP [\fI<file>\fP|\fI<dir>...\fP]\fP
-Defragment file data and/or directory metadata. If \fB-r\fP is passed, 
-files in \fIdir\fR will be defragmented recursively.
-
-
-The start position and the number of bytes to defragment can be specified by
-\fIstart\fR and \fIlen\fR. Any extent bigger than threshold will be
-considered already defragged. Use 0 to take the kernel default, and use 1 to
-say every single extent must be rewritten. You can also turn on compression in
-defragment operations.
-.RS
-
-\fIOptions\fR
-.IP "\fB-v\fP" 5
-be verbose
-.IP "\fB-c\fP" 5
-compress file contents while defragmenting
-.IP "\fB-r\fP" 5
-defragment files recursively
-.IP "\fB-f\fP" 5
-flush filesystem after defragmenting
-.IP "\fB-s \fIstart\fP\fP" 5
-defragment only from byte \fIstart\fR onward
-.IP "\fB-l \fIlen\fP\fP" 5
-defragment only up to \fIlen\fR bytes
-.IP "\fB-t \fIsize\fP\fP" 5
-defragment only files at least \fIsize\fR bytes big
-
-For \fBstart\fP, \fBlen\fP, \fBsize\fP it is possible to append a suffix
-like \fBk\fP for 1 KBytes, \fBm\fP for 1 MBytes...
-
-NOTE: defragmenting with kernels up to 2.6.37 will unlink COW-ed copies of data,
-don't use it if you use snapshots, have de-duplicated your data or made
-copies with \fBcp --reflink\fP.
-.RE
-.TP
-
-.\"
-.\" Some wording are extracted by the resize2fs man page
-.\"
-\fBfilesystem resize\fP [\fIdevid\fP:][+/\-]\fI<size>\fP[gkm]|[\fIdevid\fP:]\fImax <path>\fR
-Resize a filesystem identified by \fI<path>\fR for the underlying device
-\fIdevid\fR.  The \fIdevid\fR can be found with \fBbtrfs filesystem show\fR and
-defaults to 1 if not specified.
-The \fI<size>\fR parameter specifies the new size of the filesystem.
-If the prefix \fI+\fR or \fI\-\fR is present the size is increased or decreased
-by the quantity \fI<size>\fR.
-If no units are specified, the unit of the \fI<size>\fR parameter defaults to
-bytes. Optionally, the size parameter may be suffixed by one of the following
-units designators: 'K', 'M', or 'G', kilobytes, megabytes, or gigabytes,
-respectively.
-
-If 'max' is passed, the filesystem will occupy all available space on the
-device \fIdevid\fR.
-
-The \fBresize\fR command \fBdoes not\fR manipulate the size of underlying
-partition.  If you wish to enlarge/reduce a filesystem, you must make sure you
-can expand the partition before enlarging the filesystem and shrink the
-partition after reducing the size of the filesystem.  This can done using
-\fBfdisk(8)\fR or \fBparted(8)\fR to delete the existing partition and recreate
-it with the new desired size.  When recreating the partition make sure to use
-the same starting disk cylinder as before.
-.TP
-
-\fBfilesystem label\fP [\fI<dev>\fP|\fI<mount_point>\fP] [\fInewlabel\fP]\fP
-Show or update the label of a filesystem. \fI[<device>|<mountpoint>]\fR is used
-to identify the filesystem. 
-
-If a \fInewlabel\fR optional argument is passed, the label is changed. The
-following constraints exist for a label:
-.IP
-- the maximum allowable length shall be less than 256 chars
-.TP
-\fBfilesystem disk-usage\fP [-tb] \fIpath [path..]\fR
-
-Show in which disk the chunks are allocated.
-
-\fB-b\fP Set byte as unit
-
-\fB-t\fP Show data in tabular format
-
-.TP
-
-\fB[filesystem] balance \fI<path>\fR
-Blanace chunks across the devices
-
-\fBbtrfs balance \fI<path>\fR is deprecated,
-please use \fBbtrfs balance start\fR command instead.
-
-.TP
-\fB[filesystem] balance start\fR [\fIoptions\fP] \fI<path>\fR
-Balance chunks across the devices
-Balance and/or convert (change allocation profile of) chunks that
-passed all \fIfilters\fR in a comma-separated list of filters for a
-particular chunk type.
-If filter list is not given balance all chunks of that type.
-In case none of the \fI-d\fR, \fI-m\fR or \fI-s\fR options is
-given balance all chunks in a filesystem.
-.RS
-
-\fIOptions\fR
-.IP "\fB-d[\fIfilters\fP]\fR" 5
-act on data chunks
-.IP "\fB-m[\fIfilters\fP]\fR" 5
-act on metadata chunks
-.IP "\fB-s[\fIfilters\fP]\fR" 5
-act on system chunks (only under -f)
-.IP "\fB-v\fP" 5
-be verbose
-.IP "\fB-f\fP" 5
-force reducing of metadata integrity
-.RE
-.TP
-
-\fB[filesystem] balance pause\fR\fI <path>\fR
-Pause running balance.
-
-.RE
-.TP
-
-\fB[filesystem] balance cancel\fR\fI <path>\fR
-Cancel running or paused balance.
-.TP
-
-\fB[filesystem] balance resume\fR\fI <path>\fR
-Resume interrupted balance.
-.TP
-
-\fB[filesystem] balance status\fR [-v] \fI<path>\fR
-Show status of running or paused balance.
-.RS
-
-\fIOptions\fR
-.IP "\fB-v\fP" 5
-be verbose
-.RE
-.TP
-
-\fBdevice add\fR [-Kf] \fI<dev> \fP[\fI<dev>...\fP] \fI<path>\fR
-Add device(s) to the filesystem identified by \fI<path>\fR.
-If applicable, a whole device discard (TRIM) operation is performed.
-.RS
-
-\fIOptions\fR
-.IP "\fB-K|--nodiscard\fP" 5
-do not perform discard by default
-.IP "\fB-f|--force\fP" 5
-force overwrite of existing filesystem on the given disk(s)
-.RE
-.TP
-
-\fBdevice delete\fR\fI <dev> \fP[\fI<dev>...\fP] \fI<path>\fR
-Remove device(s) from a filesystem identified by \fI<path>\fR.
-.TP
-
-\fBdevice scan\fR [(--all-devices|-d)|\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 uses block devices containing btrfs
-filesystem as listed by blkid.
-Finally, if \fB--all-devices\fP or \fB-d\fP is passed, all the devices under /dev are 
-scanned.
-.TP
-
-\fBdevice disk-usage\fR\fI [-b] <path> [<path>..]\fR
-Show which chunks are in a device.
-
-\fB-b\fP set byte as unit.
-.TP
-
-\fBdevice ready\fR \fI<device>\fR
-Check device to see if it has all of it's devices in cache for mounting.
-.TP
-
-\fBdevice stats\fP [-z] {\fI<path>\fP|\fI<device>\fP}
-Read and print the device IO stats for all devices of the filesystem
-identified by \fI<path>\fR or for a single \fI<device>\fR.
-.RS
-
-\fIOptions\fR
-.IP "\fB-z\fP" 5
-Reset stats to zero after reading them.
-.RE
-.TP
-
-\fBscrub start\fP [-BdqrRf] [-c \fIioprio_class\fP -n \fIioprio_classdata\fP] {\fI<path>\fP|\fI<device>\fP}
-Start a scrub on all devices of the filesystem identified by \fI<path>\fR or on
-a single \fI<device>\fR. Without options, scrub is started as a background
-process. Progress can be obtained with the \fBscrub status\fR command. Scrubbing
-involves reading all data from all disks and verifying checksums. Errors are
-corrected along the way if possible.
-.IP
-The default IO priority of scrub is the idle class. The priority can be configured similar to the
-.BR ionice (1)
-syntax.
-.RS
-
-\fIOptions\fR
-.IP "\fB-B\fP" 5
-Do not background and print scrub statistics when finished.
-.IP "\fB-d\fP" 5
-Print separate statistics for each device of the filesystem (-B only).
-.IP "\fB-q\fP" 5
-Quiet. Omit error messages and statistics.
-.IP "\fB-r\fP" 5
-Read only mode. Do not attempt to correct anything.
-.IP "\fB-R\fP" 5
-Raw print mode. Print full data instead of summary.
-.IP "\fB-c \fIioprio_class\fP" 5
-Set IO priority class (see
-.BR ionice (1)
-manpage).
-.IP "\fB-n \fIioprio_classdata\fP" 5
-Set IO priority classdata (see
-.BR ionice (1)
-manpage).
-.IP "\fB-f\fP" 5
-force to check whether scrub has started or resumed in userspace.
-this is useful when scrub stat record file is damaged.
-.RE
-.TP
-
-\fBscrub cancel\fP {\fI<path>\fP|\fI<device>\fP}
-If a scrub is running on the filesystem identified by \fI<path>\fR, cancel it.
-Progress is saved in the scrub progress file and scrubbing can be resumed later
-using the \fBscrub resume\fR command.
-If a \fI<device>\fR is given, the corresponding filesystem is found and
-\fBscrub cancel\fP behaves as if it was called on that filesystem.
-.TP
-
-\fBscrub resume\fP [-BdqrR] [-c ioprio_class -n ioprio_classdata] {\fI<path>\fP|\fI<device>\fP}
-Resume a canceled or interrupted scrub cycle on the filesystem identified by
-\fI<path>\fR or on a given \fI<device>\fR. Does not start a new scrub if the
-last scrub finished successfully.
-.RS
-
-\fIOptions\fR
-.TP
-see \fBscrub start\fP.
-.RE
-.TP
-
-\fBscrub status\fP [-d] {\fI<path>\fP|\fI<device>\fP}
-Show status of a running scrub for the filesystem identified by \fI<path>\fR or
-for the specified \fI<device>\fR.
-If no scrub is running, show statistics of the last finished or canceled scrub
-for that filesystem or device.
-.RS
-
-\fIOptions\fR
-.IP "\fB-d\fP" 5
-Print separate statistics for each device of the filesystem.
-.RE
-.TP
-
-\fBcheck\fR [\fIoptions\fP] <device>\fR
-Check an unmounted btrfs filesystem.
-.RS
-
-\fIOptions\fR
-.IP "\fB-s|--support \fI<superblock>\fP\fR" 5
-use this superblock copy.
-.IP "\fB--repair\fP" 5
-try to repair the filesystem.
-.IP "\fB--init-csum-tree\fP" 5
-create a new CRC tree.
-.IP "\fB--init-extent-tree\fP" 5
-create a new extent tree.
-.RE
-.TP
-
-\fBrescue chunk-recover\fR [\fIoptions\fP] <device>\fR
-Recover the chunk tree by scanning the devices one by one.
-.RS
-
-\fIOptions\fR
-.IP "\fB-y\fP" 5
-assume an answer of 'yes' to all questions.
-.IP "\fB-v\fP" 5
-verbose mode.
-.IP "\fB-h\fP" 5
-help.
-.RE
-.TP
-
-\fBrescue super-recover\fR [\fIoptions\fP] <device>\fR
-Recover bad superblocks from good copies.
-.RS
-
-\fIOptions\fR
-.IP "\fB-y\fP" 5
-assume an answer of 'yes' to all questions.
-.IP "\fB-v\fP" 5
-verbose mode.
-.RE
-.TP
-
-\fBrestore\fR [\fIoptions\fP] \fI<device>\fR \fI<path>\fR | -l \fI<device>\fP
-Try to restore files from a damaged filesystem(unmounted) to given \fI<path>\fR or list  tree roots.
-.RS
-
-\fIOptions\fR
-.IP "\fB-s\fP" 5
-get snapshots.
-.IP "\fB-x\fP" 5
-get extended attributes.
-.IP "\fB-v\fP" 5
-verbose.
-.IP "\fB-i\fP" 5
-ignore errors.
-.IP "\fB-o\fP" 5
-overwrite.
-.IP "\fB-t \fI<location>\fP\fP" 5
-tree location.
-.IP "\fB-f \fI<offset>\fP\fP" 5
-filesystem location.
-.IP "\fB-u \fI<block>\fP\fP" 5
-super mirror.
-.IP "\fB-r \fI<rootid>\fP\fP" 5
-root objectid.
-.IP "\fB-d\fP" 5
-find dir.
-.IP "\fB-l\fP" 5
-list tree roots.
-.RE
-.TP
-
-\fBinspect-internal inode-resolve\fP [-v] \fI<inode>\fP \fI<path>\fP
-Resolves an <inode> in subvolume <path> to all filesystem paths.
-.RS
-
-\fIOptions\fR
-.IP "\fB-v\fP" 5
-verbose mode. print count of returned paths and ioctl() return value
-.RE
-.TP
-
-\fBinspect-internal logical-resolve\fP [-Pv] [-s bufsize] \fI<logical>\fP \fI<path>\fP
-Resolves a <logical> address in the filesystem mounted at <path> to all inodes.
-By default, each inode is then resolved to a file system path (similar to the
-\fBinode-resolve\fP subcommand).
-.RS
-
-\fIOptions\fR
-.IP "\fB-P\fP" 5
-skip the path resolving and print the inodes instead
-.IP "\fB-v\fP" 5
-verbose mode. print count of returned paths and all ioctl() return values
-.IP "\fB-s \fI<bufsize>\fP" 5
-set inode container's size. This is used to increase inode container's size in case it is
-not enough to read all the resolved results. The max value one can set is 64k.
-.RE
-.TP
-
-\fBinspect-internal subvolid-resolve\fP \fI<subvolid> <path>\fP
-Get file system paths for the given subvolume ID.
-.TP
-
-\fBinspect-internal rootid\fP \fI<path>\fP
-For a given file or directory, return the containing tree root id. For a
-subvolume return it's own tree id.
-
-The result is undefined for the so-called empty subvolumes (identified by inode number 2).
-.TP
-
-\fBsend\fP [-ve] [-p \fI<parent>\fP] [-c \fI<clone-src>\fP] [-f \fI<outfile>\fP] \fI<subvol>\fP [\fI<subvol>...\fP]
-Send the subvolume(s) to stdout.
-Sends the subvolume(s) specified by \fI<subvol>\fR to stdout.
-By default, this will send the whole subvolume. To do an incremental
-send, use '\fI-p <parent>\fR'. If you want to allow btrfs to clone from
-any additional local snapshots, use '\fI-c <clone-src>\fR' (multiple times
-where applicable). You must not specify clone sources unless you
-guarantee that these snapshots are exactly in the same state on both
-sides, the sender and the receiver. It is allowed to omit the '\fI-p <parent>\fR'
-option when '\fI-c <clone-src>\fR' options are given, in
-which case '\fBbtrfs send\fP' will determine a suitable parent among the
-clone sources itself.
-.RS
-
-\fIOptions\fR
-.IP "\fB-v\fP" 5
-Enable verbose debug output. Each occurrence of this option increases the
-verbose level more.
-.IP "\fB-e\fP" 5
-If sending multiple subvols at once, use the new format and omit the <end cmd> between the subvols.
-.IP "\fB-p \fI<parent>\fP" 5
-Send an incremental stream from \fI<parent>\fR to \fI<subvol>\fR.
-.IP "\fB-c \fI<clone-src>\fP" 5
-Use this snapshot as a clone source for an incremental send (multiple allowed).
-.IP "\fB-f \fI<outfile>\fP" 5
-Output is normally written to stdout. To write to a file, use this option.
-An alternative would be to use pipes.
-.RE
-.TP
-
-\fBreceive\fP [-ve] [-f \fI<infile>\fR] \fI<mount>\fR
-Receive subvolumes from stdin.
-Receives one or more subvolumes that were previously
-sent with btrfs send. The received subvolumes are stored
-into \fI<mount>\fP.
-btrfs receive will fail with the following case:
-
-1.a receiving subvolume already exists.
-
-2.a previously received subvolume was changed after it was received.
-
-3.default subvolume is changed or you don't mount btrfs filesystem with
-fs tree.
-
-After receiving a subvolume, it is immediately set to read only.
-.RS
-
-\fIOptions\fR
-.IP "\fB-v\fP" 5
-Enable verbose debug output. Each occurrence of this option increases the
-verbose level more.
-.IP "\fB-f \fI<infile>\fR" 5
-By default, btrfs receive uses stdin to receive the subvolumes.
-Use this option to specify a file to use instead.
-.IP "\fB-e\fP" 5
-Terminate after receiving an <end cmd> in the data stream.
-Without this option, the receiver terminates only if an error is recognized or on EOF.
-.RE
-.TP
-
-\fBquota enable\fR \fI<path>\fR
-Enable subvolume quota support for a filesystem.
-.TP
-
-\fBquota disable\fR \fI<path>\fR
-Disable subvolume quota support for a filesystem.
-.TP
-
-\fBquota rescan\fR [-s] \fI<path>\fR
-Trash all qgroup numbers and scan the metadata again with the current config.
-.RS
-
-\fIOptions\fR
-.IP "\fB-s\fP" 5
-show status of a running rescan operation.
-.IP "\fB-w\fP" 5
-wait for rescan operation to finish(can be already in progress).
-.RE
-.TP
-
-\fBqgroup assign\fP \fI<src> <dst> <path>\fP
-Enable subvolume qgroup support for a filesystem.
-.TP
-
-\fBqgroup remove\fP \fI<src> <dst> <path>\fP
-Remove a subvol from a quota group.
-.TP
-
-\fBqgroup create\fP \fI<qgroupid> <path>\fP
-Create a subvolume quota group.
-.TP
-
-\fBqgroup destroy\fP \fI<qgroupid> <path>\fP
-Destroy a subvolume quota group.
-.TP
-
-\fBqgroup show\fP [\fIoptions\fP] \fI<path>\fP
-Show all subvolume quota groups.
-.RS
-
-\fIOptions\fR
-.IP "\fB-p\fP" 5
-print parent qgroup id.
-.IP "\fB-c\fP" 5
-print child qgroup id.
-.IP "\fB-r\fP" 5
-print max referenced size of qgroup.
-.IP "\fB-e\fP" 5
-print max exclusive size of qgroup.
-.IP "\fB-F\fP" 5
-list all qgroups which impact the given path(include ancestral qgroups)
-.IP "\fB-f\fP" 5
-list all qgroups which impact the given path(exclude ancestral qgroups)
-.IP "\fB--sort=ATTR\fP" 5
-list qgroups in order of ATTR.
-ATTR can be one or more of \fBqgroupid\fP,\fBrfer\fP,\fBexcl\fP,\fBmax_rfer\fP,\fBmax_excl\fP.
-If multiple ATTRs is given, use comma to seperate.
-.RE
-.TP
-
-\fBqgroup limit\fP [\fIoptions\fP] \fI<size>\fP|\fBnone\fP [\fI<qgroupid>\fP] \fI<path>\fP
-Limit the size of a subvolume quota group.
-.TP
-
-\fBreplace start\fR [-Bfr] \fI<srcdev>\fP|\fI<devid> <targetdev> <path>\fR
-Replace device of a btrfs filesystem.
-On a live filesystem, duplicate the data to the target device which
-is currently stored on the source device. If the source device is not
-available anymore, or if the \fB-r\fR option is set, the data is built
-only using the RAID redundancy mechanisms. After completion of the
-operation, the source device is removed from the filesystem.
-If the \fI<srcdev>\fR is a numerical value, it is assumed to be the device id
-of the filesystem which is mounted at mount_point, otherwise is is
-the path to the source device. If the source device is disconnected,
-from the system, you have to use the \fIdevid\fR parameter format.
-The \fI<targetdev>\fP needs to be same size or larger than the \fI<srcdev>\fR.
-.RS
-
-\fIOptions\fR
-.IP "\fB-r\fP" 5
-only read from \fI<srcdev>\fR if no other zero-defect mirror exists (enable
-this if your drive has lots of read errors, the access would be very slow)
-.IP "\fB-f\fP" 5
-force using and overwriting \fI<targetdev>\fR even if it looks like
-containing a valid btrfs filesystem. A valid filesystem is
-assumed if a btrfs superblock is found which contains a
-correct checksum. Devices which are currently mounted are
-never allowed to be used as the \fI<targetdev>\fR
-.IP "\fB-B\fP" 5
-do not background
-.RE
-.TP
-
-\fBreplace status\fR [-1] \fI<mount_point>\fR
-Print status and progress information of a running device replace operation.
-.RS
-
-\fIOptions\fR
-.IP "\fB-1\fP" 5
-print once instead of print continuously until the replace
-operation finishes (or is canceled)
-.RE
-.TP
-
-\fBreplace cancel\fR \fI<mount_point>\fR
-Cancel a running device replace operation.
-.TP
-
-\fBbtrfs dedup enable\fP \fI<path>\fP
-Enable data deduplication support for a filesystem.
-.TP
-
-\fBbtrfs dedup disable\fP \fI<path>\fP
-Disable data deduplication support for a filesystem.
-.TP
-
-\fBbtrfs dedup on [-b|--bs size]\fP \fI<path>\fP
-Switch on data deduplication or change the dedup blocksize.
-.TP
-
-\fBbtrfs dedup off\fP \fI<path>\fP
-Switch off data deduplication.
-.RE
-
-.SH EXIT STATUS
-\fBbtrfs\fR returns a zero exist status if it succeeds. Non zero is returned in
-case of failure.
-
-.SH AVAILABILITY
-.B btrfs
-is part of btrfs-progs. Btrfs filesystem is currently under heavy development,
-and not suitable for any uses other than benchmarking and review.
-Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for
-further details.
-.SH SEE ALSO
-.BR mkfs.btrfs (8),
-.BR ionice (1)
diff --git a/man/btrfsck.8.in b/man/btrfsck.8.in
deleted file mode 100644
index bf65e3c..0000000
--- a/man/btrfsck.8.in
+++ /dev/null
@@ -1,29 +0,0 @@
-.TH BTRFSCK 8
-.SH NAME
-btrfsck \- check and repair of a Btrfs filesystem
-.SH SYNOPSIS
-.B btrfsck [\fIoptions\fP] \fI<device>\fP
-.SH DESCRIPTION
-\fBbtrfsck\fP is used to check and optionally repair of a Btrfs filesystem. Now, it can only be run on an unmounted FS. Considering it is not well-tested
-in real-life situations yet. if you have a broken Btrfs filesystem, btrfsck may not repair but cause aditional damages. \fI<device>\fP is the device file
-where the filesystem is stored.
-
-\fIOptions\fP
-.IP "\fB-s,--super \fI<superblock>\fP" 5
-specify which superblock copy that you want to use.
-.IP "\fB--repair\fP" 5
-try to repair the filesystem.
-.IP "\fB--init-csum-tree\fP" 5
-create a new CRC tree.
-.IP "\fB--init-extent-tree\fP" 5
-create a new extent tree.
-
-.SH EXIT CODE
-\fBbtrfsck\fR will return 0 exit code if no error happened.
-Other exit code means some problems happened.
-
-.br
-This is free software: you are free  to  change  and  redistribute  it. There is NO WARRANTY, to the extent permitted by law.
-.SH SEE ALSO
-.BR mkfs.btrfs (8),
-.BR btrfs (8)
diff --git a/man/btrfstune.8.in b/man/btrfstune.8.in
deleted file mode 100644
index c7fff9a..0000000
--- a/man/btrfstune.8.in
+++ /dev/null
@@ -1,31 +0,0 @@
-.TH BTRFSTUNE 8
-.SH NAME
-btrfstune \- tune various filesystem parameters.
-.SH SYNOPSIS
-.B btrfstune [\fIoptions\fP] \fI<device>\fP
-.SH DESCRIPTION
-\fBbtrfstune\fP is used to tune various filesystem parameters,you can
-enable/disable some extended features for btrfs.
-
-\fIOptions\fP
-.IP "\fB-S \fI<value>\fP" 5
-updates the seeding value, it forces a fs readonly so that you can use it to build other filesystems.
-.IP "\fB-r\fP" 5
-enable extended inode refs.
-.IP "\fB-x\fP" 5
-enable skinny metadata extent refs.
-
-.SH EXIT CODE
-\fBbtrfstune\fP will return 0 if no error happened.
-If any problems happened, 1 will be returned.
-
-.SH AUTHOR
-Written by Shilong Wang and Wenruo Qu.
-
-.SH COPYRIGHT
-Copyright \(co 2013 FUJITSU LIMITED.
-License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
-.br
-This is free software: you are free  to  change  and  redistribute  it. There is NO WARRANTY, to the extent permitted by law.
-.SH SEE ALSO
-.BR mkfs.btrfs (8)
diff --git a/man/fsck.btrfs.8.in b/man/fsck.btrfs.8.in
deleted file mode 100644
index eb21c89..0000000
--- a/man/fsck.btrfs.8.in
+++ /dev/null
@@ -1,47 +0,0 @@
-.TH fsck.btrfs 8
-.SH NAME
-fsck.btrfs \- do nothing, successfully
-.SH SYNOPSIS
-.B fsck.btrfs
-[\fB-aApy\fP]
-[\fBdevice...\fP]
-.SH DESCRIPTION
-.B fsck.btrfs
-is a type of utility that should exist for any filesystem and is
-called during system setup when the corresponding
-.BR /etc/fstab
-entries contain non-zero value for
-.BR fs_passno
-, see
-.BR fstab(5)
-for more.
-.PP
-Traditional filesystems need to run their respective fsck utility in case the
-filesystem was not unmounted cleanly and the log needs to be replayed before
-mount. This is not needed for BTRFS. You should set fs_passno to 0.
-.PP
-If you wish to check the consistency of a BTRFS filesystem or repair a damaged
-filesystem, see
-.BR btrfs(8)
-subcommand 'check'. By default the filesystem
-consistency is checked, the repair mode is enabled via --repair option (use
-with care!).
-.SH OPTIONS
-The options detect if \fBfsck.btrfs\fP is executed in non-interactive mode and exits
-with success, otherwise prints a message about \fBbtrfs check\fP.
-.SH EXIT CODE
-There are two possible exit code returned:
-.RS
-.IP 0 5
-No errors
-.IP 8 5
-Operational error, eg. device does not exist
-.RE
-.
-.SH FILES
-.IR /etc/fstab .
-.SH SEE ALSO
-.BR btrfs (8),
-.BR fsck (8),
-.BR fstab (5),
-.\" btrfsck is intentionally left out
diff --git a/man/mkfs.btrfs.8.in b/man/mkfs.btrfs.8.in
deleted file mode 100644
index dabeb62..0000000
--- a/man/mkfs.btrfs.8.in
+++ /dev/null
@@ -1,105 +0,0 @@
-.TH MKFS.BTRFS 8
-.SH NAME
-mkfs.btrfs \- create a btrfs filesystem
-.SH SYNOPSIS
-.B mkfs.btrfs
-[ \fB\-A\fP\fI alloc-start\fP ]
-[ \fB\-b\fP\fI byte-count\fP ]
-[ \fB\-d\fP\fI data-profile\fP ]
-[ \fB\-f\fP ]
-[ \fB\-n\fP\fI nodesize\fP ]
-[ \fB\-l\fP\fI leafsize\fP ]
-[ \fB\-L\fP\fI label\fP ]
-[ \fB\-m\fP\fI metadata profile\fP ]
-[ \fB\-M\fP\fI mixed data+metadata\fP ]
-[ \fB\-s\fP\fI sectorsize\fP ]
-[ \fB\-r\fP\fI rootdir\fP ]
-[ \fB\-K\fP ]
-[ \fB\-O\fP\fI feature1,feature2,...\fP ]
-[ \fB\-h\fP ]
-[ \fB\-V\fP ]
-\fI device\fP [ \fIdevice ...\fP ]
-.SH DESCRIPTION
-.B mkfs.btrfs
-is used to create a btrfs filesystem (usually in a disk partition, or an array
-of disk partitions).
-.I device
-is the special file corresponding to the device (e.g \fI/dev/sdXX\fP ).
-If multiple \fI devices \fP are specified, btrfs is created
-spanning across the specified \fI devices\fP.
-.SH OPTIONS
-.TP
-\fB\-A\fR, \fB\-\-alloc\-start \fIoffset\fR
-Specify the offset from the start of the device to start the btrfs filesystem. The default value is zero, or the start of the device.
-.TP
-\fB\-b\fR, \fB\-\-byte\-count \fIsize\fR
-Specify the size of the resultant filesystem. If this option is not used,
-mkfs.btrfs uses all the available storage for the filesystem.
-.TP
-\fB\-d\fR, \fB\-\-data \fItype\fR
-Specify how the data must be spanned across the devices specified. Valid
-values are raid0, raid1, raid5, raid6, raid10 or single.
-.TP
-\fB\-f\fR, \fB\-\-force\fR
-Force overwrite when an existing filesystem is detected on the device.
-By default, mkfs.btrfs will not write to the device if it suspects that 
-there is a filesystem or partition table on the device already.
-.TP
-\fB\-n\fR, \fB\-\-nodesize \fIsize\fR
-\fB\-l\fR, \fB\-\-leafsize \fIsize\fR
-Specify the nodesize, the tree block size in which btrfs stores
-data. The default value is 16KB (16384) or the page size, whichever is
-bigger. Must be a multiple of the sectorsize, but not larger than
-65536. Leafsize always equals nodesize and the options are aliases.
-.TP
-\fB\-L\fR, \fB\-\-label \fIname\fR
-Specify a label for the filesystem.
-.TP
-\fB\-m\fR, \fB\-\-metadata \fIprofile\fR
-Specify how metadata must be spanned across the devices specified. Valid
-values are raid0, raid1, raid5, raid6, raid10, single or dup.  Single device
-will have dup set by default except in the case of SSDs which will default to
-single. This is because SSDs can remap blocks internally so duplicate blocks
-could end up in the same erase block which negates the benefits of doing
-metadata duplication.
-.TP
-\fB\-M\fR, \fB\-\-mixed\fR
-Mix data and metadata chunks together for more efficient space 
-utilization.  This feature incurs a performance penalty in
-larger filesystems.  It is recommended for use with filesystems
-of 1 GiB or smaller.
-.TP
-\fB\-s\fR, \fB\-\-sectorsize \fIsize\fR
-Specify the sectorsize, the minimum data block allocation unit. The default
-value is the page size. If the sectorsize differs from the page size, the
-created filesystem may not be mountable by current kernel. Therefore it is not
-recommended to use this option unless you are going to mount it on a system
-with the appropriate page size.
-.TP
-\fB\-r\fR, \fB\-\-rootdir \fIrootdir\fR
-Specify a directory to copy into the newly created fs.
-.TP
-\fB\-K\fR, \fB\-\-nodiscard \fR
-Do not perform whole device TRIM operation by default.
-.TP
-\fB\-O\fR, \fB\-\-features \fIfeature1,feature2,...\fR
-A list of filesystem features turned on at mkfs time. Not all features are
-supported by old kernels.
-
-To see all run
-
-\fBmkfs.btrfs -O list-all\fR
-.TP
-\fB\-V\fR, \fB\-\-version\fR
-Print the \fBmkfs.btrfs\fP version and exit.
-.SH UNIT
-As default the unit is the byte, however it is possible to append a suffix
-to the arguments like \fBk\fP for KBytes, \fBm\fP for MBytes...
-.SH AVAILABILITY
-.B mkfs.btrfs
-is part of btrfs-progs. Btrfs is currently under heavy development,
-and not suitable for any uses other than benchmarking and review.
-Please refer to the btrfs wiki
-http://btrfs.wiki.kernel.org for further details.
-.SH SEE ALSO
-.BR btrfsck (8)
