From: NeilBrown <neilb@suse.de>
Date: Wed, 14 Feb 2007 08:33:11 +0000 (-0800)
Subject: [PATCH] knfsd: fix return value for writes to some files in 'nfsd' filesystem
X-Git-Tag: firefly_0821_release~31285
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8971a1016b9db4164c3c1b47ae1fde2818becf91;p=firefly-linux-kernel-4.4.55.git

[PATCH] knfsd: fix return value for writes to some files in 'nfsd' filesystem

Most files in the 'nfsd' filesystem are transactional.  When you write, a
reply is generated that can be read back only on the same 'file'.

If the reply has zero length, the 'write' will incorrectly return a value of
'0' instead of the length that was written.  This causes 'rpc.nfsd' to give an
annoying warning.

This patch fixes the test.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index eedf2e3990a9..71c686dc7257 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -123,7 +123,7 @@ static ssize_t nfsctl_transaction_write(struct file *file, const char __user *bu
 		return PTR_ERR(data);
 
 	rv =  write_op[ino](file, data, size);
-	if (rv>0) {
+	if (rv >= 0) {
 		simple_transaction_set(file, rv);
 		rv = size;
 	}