vfs: Add name to file handle conversion support

The syscall also return mount id which can be used
to lookup file system specific information such as uuid
in /proc/<pid>/mountinfo

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 12 insertions, 0 deletions

diff --git a/init/Kconfig b/init/Kconfig
index be788c0957d4..e72fa17fe559 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -287,6 +287,18 @@ config BSD_PROCESS_ACCT_V3
           for processing it. A preliminary version of these tools is available
           at <http://www.gnu.org/software/acct/>.
 
+config FHANDLE
+        bool "open by fhandle syscalls"
+        select EXPORTFS
+        help
+          If you say Y here, a user level program will be able to map
+          file names to handle and then later use the handle for
+          different file system operations. This is useful in implementing
+          userspace file servers, which now track files using handles instead
+          of names. The handle would remain the same even if file names
+          get renamed. Enables open_by_handle_at(2) and name_to_handle_at(2)
+          syscalls.
+
 config TASKSTATS
         bool "Export task/process statistics through netlink (EXPERIMENTAL)"
         depends on NET