From e5ac1d1e70a8c19a65a959d73650203df7a2e168 Mon Sep 17 00:00:00 2001
From: Jeff Dike <jdike@addtoit.com>
Date: Mon, 10 Apr 2006 22:54:53 -0700
Subject: [PATCH] [PATCH] fuse: add O_NONBLOCK support to FUSE device

I don't like duplicating the connected and list_empty tests in fuse_dev_readv,
but this seemed cleaner than adding the f_flags test to request_wait.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 fs/fuse/dev.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 438770f8867fc..75c6e9166c392 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -619,6 +619,12 @@ static ssize_t fuse_dev_readv(struct file *file, const struct iovec *iov,
 	err = -EPERM;
 	if (!fc)
 		goto err_unlock;
+
+	err = -EAGAIN;
+	if ((file->f_flags & O_NONBLOCK) && fc->connected &&
+	    list_empty(&fc->pending))
+		goto err_unlock;
+
 	request_wait(fc);
 	err = -ENODEV;
 	if (!fc->connected)
-- 
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