[PATCH] fuse: enable close_wait feature (v2)

[Maxim Patlasov <mpatlasov@parallels.com>]

The patch enables feature by passing 'true' to fuse_file_put in
fuse_release_common.

Previously, this was safe only in special cases when we sure that
multi-threaded userspace won't deadlock if we'll synchronously send
FUSE_RELEASE in the context of read-ahead or write-back callback. Now, it's
always safe because callbacks don't send requests to userspace anymore.

Changed in v2: update the patch to be applied cleanly on the top of
previous modified (v2) patch of the patch-set.

Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com>
---
 fs/fuse/file.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 150033a..83c8904 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -279,7 +279,8 @@ void fuse_release_common(struct file *file, int opcode)
 	 * synchronous RELEASE is allowed (and desirable) in this case
 	 * because the server can be trusted not to screw up.
 	 */
-	fuse_file_put(ff, ff->fc->destroy_req != NULL);
+	fuse_file_put(ff, ff->fc->destroy_req != NULL ||
+			  ff->fc->close_wait);
 }
 
 static int fuse_open(struct inode *inode, struct file *file)