[PATCH] fs: ignore O_TRUNC open flag for devices

[Sascha Hauer]

The O_TRUNC flag has to be ignored when opening devices. Otherwise
cp /somefile /dev/somedev fails. This is broken since:

| commit d4f5bb1e011ac653a167031554f0ac9e028e9e36
| Author: Sascha Hauer <s.hauer at pengutronix.de>
| Date:   Sat Sep 28 13:12:50 2013 +0200
|
|     copy_file: Add missing O_TRUNC
|
|     Without it, when copying a smaller file over a larger file the
|     resulting file still has the remaining space from the larger file.
|
|     Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---

Many usecases are broken on the latest release without this patch so
I'll make a stable release with it.

 fs/fs.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/fs.c b/fs/fs.c
index ce7b425..7d558e9 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -722,8 +722,7 @@ int open(const char *pathname, int flags, ...)
 	if (ret)
 		goto out;
 
-
-	if (flags & O_TRUNC) {
+	if (!(s.st_mode & S_IFCHR) && (flags & O_TRUNC)) {
 		ret = fsdrv->truncate(&fsdev->dev, f, 0);
 		f->size = 0;
 		if (ret)
-- 
1.8.4.rc3