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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 /include | |
| 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 'include')
| -rw-r--r-- | include/driver.h | 1 | ||||
| -rw-r--r-- | include/fs.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/include/driver.h b/include/driver.h index a5e3f44212..7d597b41b7 100644 --- a/include/driver.h +++ b/include/driver.h @@ -417,6 +417,7 @@ int cdev_erase(struct cdev *cdev, size_t count, loff_t offset); #define DEVFS_PARTITION_FIXED (1 << 0) #define DEVFS_PARTITION_READONLY (1 << 1) #define DEVFS_IS_PARTITION (1 << 2) +#define DEVFS_IS_CHARACTER_DEV (1 << 3) int devfs_add_partition(const char *devname, loff_t offset, loff_t size, int flags, const char *name); diff --git a/include/fs.h b/include/fs.h index 2b1023e453..c0b9f71fbd 100644 --- a/include/fs.h +++ b/include/fs.h @@ -24,6 +24,7 @@ typedef struct dir { typedef struct filep { struct device_d *dev; /* The device this FILE belongs to */ loff_t pos; /* current position in stream */ +#define FILE_SIZE_STREAM ((loff_t) -1) loff_t size; /* The size of this inode */ ulong flags; /* the O_* flags from open */ |