Hi Philipp,
On Tue, May 30, 2017 at 04:09:46PM +0200, Philipp Zabel wrote:
> Allow to create a loopback cdev from a file.
>
> Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
> ---
> fs/devfs-core.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> fs/fs.c | 21 ++++++++++++---
> include/driver.h | 1 +
> 3 files changed, 99 insertions(+), 4 deletions(-)
>
> diff --git a/fs/devfs-core.c b/fs/devfs-core.c
> +static ssize_t loop_write(struct cdev *cdev, const void *buf, size_t count,
> + loff_t offset, ulong flags)
> +{
> + struct loop_priv *priv = cdev->priv;
> + loff_t ofs;
> +
> + ofs = lseek(priv->fd, offset, SEEK_SET);
> + if (ofs < 0)
> + return ofs;
> +
> + return write(priv->fd, buf, count);
> +}
> +
> +static const struct file_operations loop_ops = {
> + .read = loop_read,
> + .write = loop_write,
> + .memmap = generic_memmap_rw,
> + .lseek = dev_lseek_default,
> +};
> +
> +struct cdev *cdev_create_from_file(const char *path, ulong flags)
Looks good, but I'm missing the counterpart of this function and its
usage in umount().
Sascha
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