5 files changed, 135 insertions, 0 deletions

diff --git a/Documentation/filesystems/v9fs.txt b/Documentation/filesystems/v9fs.txt
new file mode 100644
index 000000000000..4e92feb6b507
--- /dev/null
+++ b/Documentation/filesystems/v9fs.txt
@@ -0,0 +1,95 @@
+                        V9FS: 9P2000 for Linux
+                        ======================
+
+ABOUT
+=====
+
+v9fs is a Unix implementation of the Plan 9 9p remote filesystem protocol.
+
+This software was originally developed by Ron Minnich <rminnich@lanl.gov>
+and Maya Gokhale <maya@lanl.gov>.  Additional development by Greg Watson
+<gwatson@lanl.gov> and most recently Eric Van Hensbergen
+<ericvh@gmail.com> and Latchesar Ionkov <lucho@ionkov.net>.
+
+USAGE
+=====
+
+For remote file server:
+
+        mount -t 9P 10.10.1.2 /mnt/9
+
+For Plan 9 From User Space applications (http://swtch.com/plan9)
+
+        mount -t 9P `namespace`/acme /mnt/9 -o proto=unix,name=$USER
+
+OPTIONS
+=======
+
+  proto=name    select an alternative transport.  Valid options are
+                currently:
+                        unix - specifying a named pipe mount point
+                        tcp  - specifying a normal TCP/IP connection
+                        fd   - used passed file descriptors for connection
+                                (see rfdno and wfdno)
+
+  name=name     user name to attempt mount as on the remote server.  The
+                server may override or ignore this value.  Certain user
+                names may require authentication.
+
+  aname=name    aname specifies the file tree to access when the server is
+                offering several exported file systems.
+
+  debug=n       specifies debug level.  The debug level is a bitmask.
+                        0x01 = display verbose error messages
+                        0x02 = developer debug (DEBUG_CURRENT)
+                        0x04 = display 9P trace
+                        0x08 = display VFS trace
+                        0x10 = display Marshalling debug
+                        0x20 = display RPC debug
+                        0x40 = display transport debug
+                        0x80 = display allocation debug
+
+  rfdno=n       the file descriptor for reading with proto=fd
+
+  wfdno=n       the file descriptor for writing with proto=fd
+
+  maxdata=n     the number of bytes to use for 9P packet payload (msize)
+
+  port=n        port to connect to on the remote server
+
+  timeout=n     request timeouts (in ms) (default 60000ms)
+
+  noextend      force legacy mode (no 9P2000.u semantics)
+
+  uid           attempt to mount as a particular uid
+
+  gid           attempt to mount with a particular gid
+
+  afid          security channel - used by Plan 9 authentication protocols
+
+  nodevmap      do not map special files - represent them as normal files.
+                This can be used to share devices/named pipes/sockets between
+                hosts.  This functionality will be expanded in later versions.
+
+RESOURCES
+=========
+
+The Linux version of the 9P server, along with some client-side utilities
+can be found at http://v9fs.sf.net (along with a CVS repository of the
+development branch of this module).  There are user and developer mailing
+lists here, as well as a bug-tracker.
+
+For more information on the Plan 9 Operating System check out
+http://plan9.bell-labs.com/plan9
+
+For information on Plan 9 from User Space (Plan 9 applications and libraries
+ported to Linux/BSD/OSX/etc) check out http://swtch.com/plan9
+
+
+STATUS
+======
+
+The 2.6 kernel support is working on PPC and x86.
+
+PLEASE USE THE SOURCEFORGE BUG-TRACKER TO REPORT PROBLEMS.
+
diff --git a/MAINTAINERS b/MAINTAINERS
index eaa46594f021..8429bdb1d2a1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2684,6 +2684,17 @@ L:	rio500-users@lists.sourceforge.net
 W:      http://rio500.sourceforge.net
 S:      Maintained
 
+V9FS FILE SYSTEM
+P:      Eric Van Hensbergen
+M:      ericvh@gmail.com
+P:      Ron Minnich
+M:      rminnich@lanl.gov
+P:      Latchesar Ionkov
+M:      lucho@ionkov.net
+L:      v9fs-developer@lists.sourceforge.net
+W:      http://v9fs.sf.net
+S:      Maintained
+
 VIDEO FOR LINUX
 P:      Mauro Carvalho Chehab
 M:      mchehab@brturbo.com.br
diff --git a/fs/9p/Makefile b/fs/9p/Makefile
new file mode 100644
index 000000000000..e4e4ffe5a7dc
--- /dev/null
+++ b/fs/9p/Makefile
@@ -0,0 +1,17 @@
+obj-$(CONFIG_9P_FS) := 9p2000.o
+
+9p2000-objs := \
+        vfs_super.o \
+        vfs_inode.o \
+        vfs_file.o \
+        vfs_dir.o \
+        vfs_dentry.o \
+        error.o \
+        mux.o \
+        trans_fd.o \
+        trans_sock.o \
+        9p.o \
+        conv.o \
+        v9fs.o \
+        fid.o
+
diff --git a/fs/Kconfig b/fs/Kconfig
index 5e817902cb3b..443aed4e2067 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1703,6 +1703,17 @@ config AFS_FS
 config RXRPC
         tristate
 
+config 9P_FS
+        tristate "Plan 9 Resource Sharing Support (9P2000) (Experimental)"
+        depends on INET && EXPERIMENTAL
+        help
+          If you say Y here, you will get experimental support for
+          Plan 9 resource sharing via the 9P2000 protocol.
+
+          See <http://v9fs.sf.net> for more information.
+
+          If unsure, say N.
+
 endmenu
 
 menu "Partition Types"
diff --git a/fs/Makefile b/fs/Makefile
index 15158309dee4..d646502c1efb 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -94,6 +94,7 @@ obj-$(CONFIG_RELAYFS_FS)	+= relayfs/
 obj-$(CONFIG_SUN_OPENPROMFS)    += openpromfs/
 obj-$(CONFIG_JFS_FS)            += jfs/
 obj-$(CONFIG_XFS_FS)            += xfs/
+obj-$(CONFIG_9P_FS)             += 9p/
 obj-$(CONFIG_AFS_FS)            += afs/
 obj-$(CONFIG_BEFS_FS)           += befs/
 obj-$(CONFIG_HOSTFS)            += hostfs/