69 static int fill_read_buffer(struct dentry * dentry, struct configfs_buffer * buffer)  in fill_read_buffer()  argument
76 	if (!buffer->page)  in fill_read_buffer()
77 		buffer->page = (char *) get_zeroed_page(GFP_KERNEL);  in fill_read_buffer()
78 	if (!buffer->page)  in fill_read_buffer()
81 	count = attr->show(item, buffer->page);  in fill_read_buffer()
85 		buffer->needs_read_fill = 0;  in fill_read_buffer()
86 		buffer->count = count;  in fill_read_buffer()
114 	struct configfs_buffer * buffer = file->private_data;  in configfs_read_file()  local
117 	mutex_lock(&buffer->mutex);  in configfs_read_file()
118 	if (buffer->needs_read_fill) {  in configfs_read_file()
119 		if ((retval = fill_read_buffer(file->f_path.dentry,buffer)))  in configfs_read_file()
123 		 __func__, count, *ppos, buffer->page);  in configfs_read_file()
124 	retval = simple_read_from_buffer(buf, count, ppos, buffer->page,  in configfs_read_file()
125 					 buffer->count);  in configfs_read_file()
127 	mutex_unlock(&buffer->mutex);  in configfs_read_file()
155 	struct configfs_buffer *buffer = file->private_data;  in configfs_read_bin_file()  local
162 	mutex_lock(&buffer->mutex);  in configfs_read_bin_file()
165 	if (buffer->write_in_progress) {  in configfs_read_bin_file()
169 	buffer->read_in_progress = true;  in configfs_read_bin_file()
171 	if (buffer->needs_read_fill) {  in configfs_read_bin_file()
185 		buffer->bin_buffer = vmalloc(len);  in configfs_read_bin_file()
186 		if (buffer->bin_buffer == NULL) {  in configfs_read_bin_file()
190 		buffer->bin_buffer_size = len;  in configfs_read_bin_file()
193 		len = bin_attr->read(item, buffer->bin_buffer, len);  in configfs_read_bin_file()
196 			vfree(buffer->bin_buffer);  in configfs_read_bin_file()
197 			buffer->bin_buffer_size = 0;  in configfs_read_bin_file()
198 			buffer->bin_buffer = NULL;  in configfs_read_bin_file()
202 		buffer->needs_read_fill = 0;  in configfs_read_bin_file()
205 	retval = simple_read_from_buffer(buf, count, ppos, buffer->bin_buffer,  in configfs_read_bin_file()
206 					buffer->bin_buffer_size);  in configfs_read_bin_file()
208 	mutex_unlock(&buffer->mutex);  in configfs_read_bin_file()
224 fill_write_buffer(struct configfs_buffer * buffer, const char __user * buf, size_t count)  in fill_write_buffer()  argument
228 	if (!buffer->page)  in fill_write_buffer()
229 		buffer->page = (char *)__get_free_pages(GFP_KERNEL, 0);  in fill_write_buffer()
230 	if (!buffer->page)  in fill_write_buffer()
235 	error = copy_from_user(buffer->page,buf,count);  in fill_write_buffer()
236 	buffer->needs_read_fill = 1;  in fill_write_buffer()
239 	buffer->page[count] = 0;  in fill_write_buffer()
256 flush_write_buffer(struct dentry * dentry, struct configfs_buffer * buffer, size_t count)  in flush_write_buffer()  argument
261 	return attr->store(item, buffer->page, count);  in flush_write_buffer()
285 	struct configfs_buffer * buffer = file->private_data;  in configfs_write_file()  local
288 	mutex_lock(&buffer->mutex);  in configfs_write_file()
289 	len = fill_write_buffer(buffer, buf, count);  in configfs_write_file()
291 		len = flush_write_buffer(file->f_path.dentry, buffer, len);  in configfs_write_file()
294 	mutex_unlock(&buffer->mutex);  in configfs_write_file()
315 	struct configfs_buffer *buffer = file->private_data;  in configfs_write_bin_file()  local
321 	mutex_lock(&buffer->mutex);  in configfs_write_bin_file()
324 	if (buffer->read_in_progress) {  in configfs_write_bin_file()
328 	buffer->write_in_progress = true;  in configfs_write_bin_file()
331 	if (*ppos + count > buffer->bin_buffer_size) {  in configfs_write_bin_file()
346 		if (buffer->bin_buffer) {  in configfs_write_bin_file()
347 			memcpy(tbuf, buffer->bin_buffer,  in configfs_write_bin_file()
348 				buffer->bin_buffer_size);  in configfs_write_bin_file()
349 			vfree(buffer->bin_buffer);  in configfs_write_bin_file()
353 		memset(tbuf + buffer->bin_buffer_size, 0,  in configfs_write_bin_file()
354 			*ppos + count - buffer->bin_buffer_size);  in configfs_write_bin_file()
355 		buffer->bin_buffer = tbuf;  in configfs_write_bin_file()
356 		buffer->bin_buffer_size = *ppos + count;  in configfs_write_bin_file()
359 	len = simple_write_to_buffer(buffer->bin_buffer,  in configfs_write_bin_file()
360 			buffer->bin_buffer_size, ppos, buf, count);  in configfs_write_bin_file()
362 	mutex_unlock(&buffer->mutex);  in configfs_write_bin_file()
371 	struct configfs_buffer * buffer;  in check_perm()  local
425 	buffer = kzalloc(sizeof(struct configfs_buffer),GFP_KERNEL);  in check_perm()
426 	if (!buffer) {  in check_perm()
430 	mutex_init(&buffer->mutex);  in check_perm()
431 	buffer->needs_read_fill = 1;  in check_perm()
432 	buffer->read_in_progress = false;  in check_perm()
433 	buffer->write_in_progress = false;  in check_perm()
434 	buffer->ops = ops;  in check_perm()
435 	file->private_data = buffer;  in check_perm()
456 	struct configfs_buffer * buffer = filp->private_data;  in configfs_release()  local
463 	if (buffer) {  in configfs_release()
464 		if (buffer->page)  in configfs_release()
465 			free_page((unsigned long)buffer->page);  in configfs_release()
466 		mutex_destroy(&buffer->mutex);  in configfs_release()
467 		kfree(buffer);  in configfs_release()
484 	struct configfs_buffer *buffer = filp->private_data;  in configfs_release_bin_file()  local
491 	buffer->read_in_progress = false;  in configfs_release_bin_file()
493 	if (buffer->write_in_progress) {  in configfs_release_bin_file()
494 		buffer->write_in_progress = false;  in configfs_release_bin_file()
496 		len = bin_attr->write(item, buffer->bin_buffer,  in configfs_release_bin_file()
497 				buffer->bin_buffer_size);  in configfs_release_bin_file()
500 		vfree(buffer->bin_buffer);  in configfs_release_bin_file()
501 		buffer->bin_buffer = NULL;  in configfs_release_bin_file()
502 		buffer->bin_buffer_size = 0;  in configfs_release_bin_file()
503 		buffer->needs_read_fill = 1;  in configfs_release_bin_file()