[PATCH 1/6] fuse: add FOPEN_SYNC_RELEASE flag to ff->open_flags

[Maxim Patlasov <MPatlasov@parallels.com>]

The feature will be governed by fuse file open flag FOPEN_SYNC_RELEASE.
Userspace can enable it on per file basis in the same way as for
FOPEN_KEEP_CACHE or FOPEN_DIRECT_IO.

Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com>
---
 include/uapi/linux/fuse.h |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index 25084a0..607c45c 100644
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -205,10 +205,13 @@ struct fuse_file_lock {
  * FOPEN_DIRECT_IO: bypass page cache for this open file
  * FOPEN_KEEP_CACHE: don't invalidate the data cache on open
  * FOPEN_NONSEEKABLE: the file is not seekable
+ * FOPEN_SYNC_RELEASE: synchronously release file on last fput,
+ *                     which, in turn, not always bound to fclose(2)!
  */
 #define FOPEN_DIRECT_IO		(1 << 0)
 #define FOPEN_KEEP_CACHE	(1 << 1)
 #define FOPEN_NONSEEKABLE	(1 << 2)
+#define FOPEN_SYNC_RELEASE	(1 << 3)
 
 /**
  * INIT request/reply flags