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fs: ignore O_TRUNC open flag for devices 

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

| commit d4f5bb1e01
| Author: Sascha Hauer <s.hauer@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@pengutronix.de>

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2013-10-16 10:58:53 +02:00
parent 0ce9083582
commit 42cb98c6ae
1 changed files with 1 additions and 2 deletions
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3
fs/fs.c
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@ -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)