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| author | Sascha Hauer <s.hauer@pengutronix.de> | 2012-07-03 10:12:40 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2012-07-04 08:38:22 +0200 |
| commit | 8d064097eb1033f9ada70e786dd09617ffa0eed0 (patch) | |
| tree | 155d7c803db286aa039f1d74de69a5bdc6a14b71 /fs/devfs.c | |
| parent | cca17e25bfb7e7cc2b0ab4164561f725969ce36a (diff) | |
| download | barebox-8d064097eb1033f9ada70e786dd09617ffa0eed0.tar.gz barebox-8d064097eb1033f9ada70e786dd09617ffa0eed0.tar.xz | |
fs: fix standard zero, full devices
The standard devices are currently broken since they have
the size ~0. As now files use loff_t as file size which is a signed
type the read implementation gets confused and now returns -1.
The current implementation also has the (somewhat theorical) problem
that we do not have real streaming devices, so /dev/zero went out
of zeroes after reading 4GB (or now LLONG_MAX).
This patch introduces a new cdev flag DEVFS_IS_CHARACTER_DEV and a new
file size flag FILE_SIZE_STREAM which makes it possible to create
real stream devices instead.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'fs/devfs.c')
| -rw-r--r-- | fs/devfs.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/devfs.c b/fs/devfs.c index ea8b250a68..fccf25a721 100644 --- a/fs/devfs.c +++ b/fs/devfs.c @@ -121,7 +121,8 @@ static int devfs_open(struct device_d *_dev, FILE *f, const char *filename) if (!cdev) return -ENOENT; - f->size = cdev->size; + f->size = cdev->flags & DEVFS_IS_CHARACTER_DEV ? + FILE_SIZE_STREAM : cdev->size; f->inode = cdev; if (cdev->ops->open) { |