fuse: support BSD locking semantics
It is trivial to add support for flock(2) semantics to the existing protocol,
by setting the lock owner field to the file pointer, and passing a new
FUSE_LK_FLOCK flag with the locking request.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index 4360470..015a8b1 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -13,6 +13,7 @@
*
* 7.9:
* - new fuse_getattr_in input argument of GETATTR
+ * - add lk_flags in fuse_lk_in
*/
#include <asm/types.h>
@@ -113,6 +114,11 @@
*/
#define FUSE_GETATTR_FH (1 << 0)
+/**
+ * Lock flags
+ */
+#define FUSE_LK_FLOCK (1 << 0)
+
enum fuse_opcode {
FUSE_LOOKUP = 1,
FUSE_FORGET = 2, /* no reply */
@@ -295,6 +301,8 @@
__u64 fh;
__u64 owner;
struct fuse_file_lock lk;
+ __u32 lk_flags;
+ __u32 padding;
};
struct fuse_lk_out {