Exemplos de get_files_struct em C++ (Cpp)

Exemplo n.º 1

Arquivo: fd.c Projeto: AD5GB/kernel_n5_3.10-experimental

static int tid_fd_revalidate(struct dentry *dentry, unsigned int flags)
{
	struct files_struct *files;
	struct task_struct *task;
	const struct cred *cred;
	struct inode *inode;
	int fd;

	if (flags & LOOKUP_RCU)
		return -ECHILD;

	inode = dentry->d_inode;
	task = get_proc_task(inode);
	fd = proc_fd(inode);

	if (task) {
		files = get_files_struct(task);
		if (files) {
			struct file *file;

			rcu_read_lock();
			file = fcheck_files(files, fd);
			if (file) {
				unsigned f_mode = file->f_mode;

				rcu_read_unlock();
				put_files_struct(files);

				if (task_dumpable(task)) {
					rcu_read_lock();
					cred = __task_cred(task);
					inode->i_uid = cred->euid;
					inode->i_gid = cred->egid;
					rcu_read_unlock();
				} else {
					inode->i_uid = GLOBAL_ROOT_UID;
					inode->i_gid = GLOBAL_ROOT_GID;
				}

				if (S_ISLNK(inode->i_mode)) {
					unsigned i_mode = S_IFLNK;
					if (f_mode & FMODE_READ)
						i_mode |= S_IRUSR | S_IXUSR;
					if (f_mode & FMODE_WRITE)
						i_mode |= S_IWUSR | S_IXUSR;
					inode->i_mode = i_mode;
				}

				security_task_to_inode(task, inode);
				put_task_struct(task);
				return 1;
			}
			rcu_read_unlock();
			put_files_struct(files);
		}
		put_task_struct(task);
	}

	d_drop(dentry);
	return 0;
}

Exemplo n.º 2

Arquivo: fd_link.c Projeto: Grace-Liu/dpdk-ovs

static long
fd_link_ioctl (struct file *f, unsigned int ioctl, unsigned long arg)
{
	void __user *argp = (void __user *) arg;
	struct task_struct *task_target = NULL;
	struct file *file;
	struct files_struct *files;
	struct fdtable *fdt;
	struct fd_copy fd_copy;

	switch (ioctl)
	{
		case FD_COPY:
			if (copy_from_user (&fd_copy, argp, sizeof (struct fd_copy)))
				return -EFAULT;

			/*
			 * Find the task struct for the target pid
			 */
			task_target =
				pid_task (find_vpid (fd_copy.target_pid), PIDTYPE_PID);
			if (task_target == NULL)
			{
				printk (KERN_DEBUG "Failed to get mem ctx for target pid\n");
				return -EFAULT;
			}

			files = get_files_struct (current);
			if (files == NULL)
			{
				printk (KERN_DEBUG "Failed to get files struct\n");
				return -EFAULT;
			}

			rcu_read_lock ();
			file = fcheck_files (files, fd_copy.source_fd);
			if (file)
			{
				if (file->f_mode & FMODE_PATH
						|| !atomic_long_inc_not_zero (&file->f_count))
					file = NULL;
			}
			rcu_read_unlock ();
			put_files_struct (files);

			if (file == NULL)
			{
				printk (KERN_DEBUG "Failed to get file from source pid\n");
				return 0;
			}

			/*
			 * Release the existing fd in the source process
			 */
			spin_lock (&files->file_lock);
			filp_close (file, files);
			fdt = files_fdtable (files);
			fdt->fd[fd_copy.source_fd] = NULL;
			spin_unlock (&files->file_lock);

			/*
			 * Find the file struct associated with the target fd.
			 */

			files = get_files_struct (task_target);
			if (files == NULL)
			{
				printk (KERN_DEBUG "Failed to get files struct\n");
				return -EFAULT;
			}

			rcu_read_lock ();
			file = fcheck_files (files, fd_copy.target_fd);
			if (file)
			{
				if (file->f_mode & FMODE_PATH
						|| !atomic_long_inc_not_zero (&file->f_count))
					file = NULL;
			}
			rcu_read_unlock ();
			put_files_struct (files);

			if (file == NULL)
			{
				printk (KERN_DEBUG "Failed to get file from target pid\n");
				return 0;
			}


			/*
			 * Install the file struct from the target process into the
			 * file desciptor of the source process,
			 */

			fd_install (fd_copy.source_fd, file);

			return 0;

		default:
			return -ENOIOCTLCMD;
	}
}