C++ (Cpp) scribe_track_next_file_no_inode示例

示例#1

SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high,
		unsigned long, offset_low, loff_t __user *, result,
		unsigned int, origin)
{
	int retval;
	struct file * file;
	loff_t offset;
	int fput_needed;

	if (scribe_track_next_file_no_inode())
		return -ENOMEM;

	retval = -EBADF;
	file = fget_light(fd, &fput_needed);
	if (!file)
		goto bad;

	retval = -EINVAL;
	if (origin > SEEK_MAX)
		goto out_putf;

	offset = vfs_llseek(file, ((loff_t) offset_high << 32) | offset_low,
			origin);

	retval = (int)offset;
	if (offset >= 0) {
		retval = -EFAULT;
		if (!copy_to_user(result, &offset, sizeof(offset)))
			retval = 0;
	}
out_putf:
	fput_light(file, fput_needed);
bad:
	return retval;
}

示例#2

SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, origin)
{
	off_t retval;
	struct file * file;
	int fput_needed;

	if (scribe_track_next_file_no_inode())
		return -ENOMEM;

	retval = -EBADF;
	file = fget_light(fd, &fput_needed);
	if (!file)
		goto bad;

	retval = -EINVAL;
	if (origin <= SEEK_MAX) {
		loff_t res = vfs_llseek(file, offset, origin);
		retval = res;
		if (res != (loff_t)retval)
			retval = -EOVERFLOW;	/* LFS: should only happen on 32 bit platforms */
	}
	fput_light(file, fput_needed);
bad:
	return retval;
}

示例#3

int vfs_fstat(unsigned int fd, struct kstat *stat)
{
	struct file *f;
	int error = -EBADF;

	if (scribe_track_next_file_no_inode())
		return -ENOMEM;

	f = fget(fd);
	if (f) {
		error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
		fput(f);
	}
	return error;
}