FS / libfs: Implement simple_write_to_buffer

	return count;

}

/**

 * simple_write_to_buffer - copy data from user space to the buffer

 * @to: the buffer to write to

 * @available: the size of the buffer

 * @ppos: the current position in the buffer

 * @from: the user space buffer to read from

 * @count: the maximum number of bytes to read

 *

 * The simple_write_to_buffer() function reads up to @count bytes from the user

 * space address starting at @from into the buffer @to at offset @ppos.

 *

 * On success, the number of bytes written is returned and the offset @ppos is

 * advanced by this number, or negative value is returned on error.

 **/

ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,

		const void __user *from, size_t count)

{

	loff_t pos = *ppos;

	size_t res;

	if (pos < 0)

		return -EINVAL;

	if (pos >= available || !count)

		return 0;

	if (count > available - pos)

		count = available - pos;

	res = copy_from_user(to + pos, from, count);

	if (res == count)

		return -EFAULT;

	count -= res;

	*ppos = pos + count;

	return count;

}

/**

 * memory_read_from_buffer - copy data from the buffer

 * @to: the kernel space buffer to read to

EXPORT_SYMBOL(simple_sync_file);

EXPORT_SYMBOL(simple_unlink);

EXPORT_SYMBOL(simple_read_from_buffer);

EXPORT_SYMBOL(simple_write_to_buffer);

EXPORT_SYMBOL(memory_read_from_buffer);

EXPORT_SYMBOL(simple_transaction_set);

EXPORT_SYMBOL(simple_transaction_get);

extern ssize_t simple_read_from_buffer(void __user *to, size_t count,

			loff_t *ppos, const void *from, size_t available);

extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,

		const void __user *from, size_t count);

extern int simple_fsync(struct file *, struct dentry *, int);