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fuse: device fd clone

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Allow an open fuse device to be "cloned".  Userspace can create a clone by:

      newfd = open("/dev/fuse", O_RDWR)
      ioctl(newfd, FUSE_DEV_IOC_CLONE, &oldfd);

At this point newfd will refer to the same fuse connection as oldfd.

Signed-off-by: Miklos Szeredi <[email protected]>
Reviewed-by: Ashish Samant <[email protected]>
This commit is contained in:
Miklos Szeredi 2015-07-01 16:26:08 +02:00
commit 00c570f4ba
3 changed files with 44 additions and 0 deletions
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40
fs/fuse/dev.c
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@ -2197,6 +2197,44 @@ static int fuse_dev_fasync(int fd, struct file *file, int on)
return fasync_helper(fd, file, on, &fc->iq.fasync);
}
static int fuse_device_clone(struct fuse_conn *fc, struct file *new)
{
if (new->private_data)
return -EINVAL;
new->private_data = fuse_conn_get(fc);
return 0;
}
static long fuse_dev_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
int err = -ENOTTY;
if (cmd == FUSE_DEV_IOC_CLONE) {
int oldfd;
err = -EFAULT;
if (!get_user(oldfd, (__u32 __user *) arg)) {
struct file *old = fget(oldfd);
err = -EINVAL;
if (old) {
struct fuse_conn *fc = fuse_get_conn(old);
if (fc) {
mutex_lock(&fuse_mutex);
err = fuse_device_clone(fc, file);
mutex_unlock(&fuse_mutex);
}
fput(old);
}
}
}
return err;
}
const struct file_operations fuse_dev_operations = {
.owner = THIS_MODULE,
.open = fuse_dev_open,
@ -2208,6 +2246,8 @@ const struct file_operations fuse_dev_operations = {
.poll = fuse_dev_poll,
.release = fuse_dev_release,
.fasync = fuse_dev_fasync,
.unlocked_ioctl = fuse_dev_ioctl,
.compat_ioctl = fuse_dev_ioctl,
};
EXPORT_SYMBOL_GPL(fuse_dev_operations);