예제 #1
0
파일: bin.c 프로젝트: gnensis/linux-2.6.15
static int open(struct inode * inode, struct file * file)
{
	struct kobject *kobj = sysfs_get_kobject(file->f_dentry->d_parent);
	struct bin_attribute * attr = to_bin_attr(file->f_dentry);
	int error = -EINVAL;

	if (!kobj || !attr)
		goto Done;

	/* Grab the module reference for this attribute if we have one */
	error = -ENODEV;
	if (!try_module_get(attr->attr.owner)) 
		goto Done;

	error = -EACCES;
	if ((file->f_mode & FMODE_WRITE) && !(attr->write || attr->mmap))
		goto Error;
	if ((file->f_mode & FMODE_READ) && !(attr->read || attr->mmap))
		goto Error;

	error = -ENOMEM;
	file->private_data = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!file->private_data)
		goto Error;

	error = 0;
    goto Done;

 Error:
	module_put(attr->attr.owner);
 Done:
	if (error && kobj)
		kobject_put(kobj);
	return error;
}
예제 #2
0
static int configfs_release_bin_file(struct inode *inode, struct file *filp)
{
    struct configfs_buffer *buffer = filp->private_data;
    struct dentry *dentry = filp->f_path.dentry;
    struct config_item *item = to_item(dentry->d_parent);
    struct configfs_item_operations *ops = buffer->ops;
    struct configfs_bin_attribute *bin_attr = to_bin_attr(dentry);
    ssize_t len = 0;
    int ret;

    buffer->read_in_progress = 0;

    if (buffer->write_in_progress) {
        buffer->write_in_progress = 0;

        len = ops->write_bin_attribute(item, bin_attr,
                                       buffer->bin_buffer, buffer->bin_buffer_size);

        /* vfree on NULL is safe */
        vfree(buffer->bin_buffer);
        buffer->bin_buffer = NULL;
        buffer->bin_buffer_size = 0;
        buffer->needs_read_fill = 1;
    }

    ret = do_release(inode, filp,
                     to_item(filp->f_path.dentry->d_parent),
                     to_attr(filp->f_path.dentry), CONFIGFS_ITEM_BIN_ATTR);
    if (len < 0)
        return len;
    return ret;
}
예제 #3
0
파일: file.c 프로젝트: a2hojsjsjs/linux
static ssize_t
configfs_read_bin_file(struct file *file, char __user *buf,
		       size_t count, loff_t *ppos)
{
	struct configfs_buffer *buffer = file->private_data;
	struct dentry *dentry = file->f_path.dentry;
	struct config_item *item = to_item(dentry->d_parent);
	struct configfs_bin_attribute *bin_attr = to_bin_attr(dentry);
	ssize_t retval = 0;
	ssize_t len = min_t(size_t, count, PAGE_SIZE);

	mutex_lock(&buffer->mutex);

	/* we don't support switching read/write modes */
	if (buffer->write_in_progress) {
		retval = -ETXTBSY;
		goto out;
	}
	buffer->read_in_progress = 1;

	if (buffer->needs_read_fill) {
		/* perform first read with buf == NULL to get extent */
		len = bin_attr->read(item, NULL, 0);
		if (len <= 0) {
			retval = len;
			goto out;
		}

		/* do not exceed the maximum value */
		if (bin_attr->cb_max_size && len > bin_attr->cb_max_size) {
			retval = -EFBIG;
			goto out;
		}

		buffer->bin_buffer = vmalloc(len);
		if (buffer->bin_buffer == NULL) {
			retval = -ENOMEM;
			goto out;
		}
		buffer->bin_buffer_size = len;

		/* perform second read to fill buffer */
		len = bin_attr->read(item, buffer->bin_buffer, len);
		if (len < 0) {
			retval = len;
			vfree(buffer->bin_buffer);
			buffer->bin_buffer_size = 0;
			buffer->bin_buffer = NULL;
			goto out;
		}

		buffer->needs_read_fill = 0;
	}

	retval = simple_read_from_buffer(buf, count, ppos, buffer->bin_buffer,
					buffer->bin_buffer_size);
out:
	mutex_unlock(&buffer->mutex);
	return retval;
}
예제 #4
0
파일: file.c 프로젝트: a2hojsjsjs/linux
static ssize_t
configfs_write_bin_file(struct file *file, const char __user *buf,
			size_t count, loff_t *ppos)
{
	struct configfs_buffer *buffer = file->private_data;
	struct dentry *dentry = file->f_path.dentry;
	struct configfs_bin_attribute *bin_attr = to_bin_attr(dentry);
	void *tbuf = NULL;
	ssize_t len;

	mutex_lock(&buffer->mutex);

	/* we don't support switching read/write modes */
	if (buffer->read_in_progress) {
		len = -ETXTBSY;
		goto out;
	}
	buffer->write_in_progress = 1;

	/* buffer grows? */
	if (*ppos + count > buffer->bin_buffer_size) {

		if (bin_attr->cb_max_size &&
			*ppos + count > bin_attr->cb_max_size) {
			len = -EFBIG;
		}

		tbuf = vmalloc(*ppos + count);
		if (tbuf == NULL) {
			len = -ENOMEM;
			goto out;
		}

		/* copy old contents */
		if (buffer->bin_buffer) {
			memcpy(tbuf, buffer->bin_buffer,
				buffer->bin_buffer_size);
			vfree(buffer->bin_buffer);
		}

		/* clear the new area */
		memset(tbuf + buffer->bin_buffer_size, 0,
			*ppos + count - buffer->bin_buffer_size);
		buffer->bin_buffer = tbuf;
		buffer->bin_buffer_size = *ppos + count;
	}

	len = simple_write_to_buffer(buffer->bin_buffer,
			buffer->bin_buffer_size, ppos, buf, count);
	if (len > 0)
		*ppos += len;
out:
	mutex_unlock(&buffer->mutex);
	return len;
}
예제 #5
0
파일: bin.c 프로젝트: gnensis/linux-2.6.15
static int
flush_write(struct dentry *dentry, char *buffer, loff_t offset, size_t count)
{
	struct bin_attribute *attr = to_bin_attr(dentry);
	struct kobject *kobj = to_kobj(dentry->d_parent);

	if (!attr->write)
		return -EIO;

	return attr->write(kobj, buffer, offset, count);
}
예제 #6
0
파일: bin.c 프로젝트: gnensis/linux-2.6.15
static int
fill_read(struct dentry *dentry, char *buffer, loff_t off, size_t count)
{
	struct bin_attribute * attr = to_bin_attr(dentry);
	struct kobject * kobj = to_kobj(dentry->d_parent);

	if (!attr->read)
		return -EIO;

	return attr->read(kobj, buffer, off, count);
}
예제 #7
0
파일: bin.c 프로젝트: gnensis/linux-2.6.15
static int mmap(struct file *file, struct vm_area_struct *vma)
{
	struct dentry *dentry = file->f_dentry;
	struct bin_attribute *attr = to_bin_attr(dentry);
	struct kobject *kobj = to_kobj(dentry->d_parent);

	if (!attr->mmap)
		return -EINVAL;

	return attr->mmap(kobj, attr, vma);
}
예제 #8
0
파일: bin.c 프로젝트: gnensis/linux-2.6.15
static int release(struct inode * inode, struct file * file)
{
	struct kobject * kobj = to_kobj(file->f_dentry->d_parent);
	struct bin_attribute * attr = to_bin_attr(file->f_dentry);
	u8 * buffer = file->private_data;

	if (kobj) 
		kobject_put(kobj);
	module_put(attr->attr.owner);
	kfree(buffer);
	return 0;
}
예제 #9
0
파일: file.c 프로젝트: a2hojsjsjs/linux
static int check_perm(struct inode * inode, struct file * file, int type)
{
	struct config_item *item = configfs_get_config_item(file->f_path.dentry->d_parent);
	struct configfs_attribute * attr = to_attr(file->f_path.dentry);
	struct configfs_bin_attribute *bin_attr = NULL;
	struct configfs_buffer * buffer;
	struct configfs_item_operations * ops = NULL;
	int error = 0;

	if (!item || !attr)
		goto Einval;

	if (type & CONFIGFS_ITEM_BIN_ATTR)
		bin_attr = to_bin_attr(file->f_path.dentry);

	/* Grab the module reference for this attribute if we have one */
	if (!try_module_get(attr->ca_owner)) {
		error = -ENODEV;
		goto Done;
	}

	if (item->ci_type)
		ops = item->ci_type->ct_item_ops;
	else
		goto Eaccess;

	/* File needs write support.
	 * The inode's perms must say it's ok,
	 * and we must have a store method.
	 */
	if (file->f_mode & FMODE_WRITE) {
		if (!(inode->i_mode & S_IWUGO))
			goto Eaccess;

		if ((type & CONFIGFS_ITEM_ATTR) && !attr->store)
			goto Eaccess;

		if ((type & CONFIGFS_ITEM_BIN_ATTR) && !bin_attr->write)
			goto Eaccess;
	}

	/* File needs read support.
	 * The inode's perms must say it's ok, and we there
	 * must be a show method for it.
	 */
	if (file->f_mode & FMODE_READ) {
		if (!(inode->i_mode & S_IRUGO))
			goto Eaccess;

		if ((type & CONFIGFS_ITEM_ATTR) && !attr->show)
			goto Eaccess;

		if ((type & CONFIGFS_ITEM_BIN_ATTR) && !bin_attr->read)
			goto Eaccess;
	}

	/* No error? Great, allocate a buffer for the file, and store it
	 * it in file->private_data for easy access.
	 */
	buffer = kzalloc(sizeof(struct configfs_buffer),GFP_KERNEL);
	if (!buffer) {
		error = -ENOMEM;
		goto Enomem;
	}
	mutex_init(&buffer->mutex);
	buffer->needs_read_fill = 1;
	buffer->read_in_progress = 0;
	buffer->write_in_progress = 0;
	buffer->ops = ops;
	file->private_data = buffer;
	goto Done;

 Einval:
	error = -EINVAL;
	goto Done;
 Eaccess:
	error = -EACCES;
 Enomem:
	module_put(attr->ca_owner);
 Done:
	if (error && item)
		config_item_put(item);
	return error;
}