Lines Matching full:buffer
72 static int fill_read_buffer(struct file *file, struct configfs_buffer *buffer) in fill_read_buffer() argument
77 if (!buffer->page) in fill_read_buffer()
78 buffer->page = (char *) get_zeroed_page(GFP_KERNEL); in fill_read_buffer()
79 if (!buffer->page) in fill_read_buffer()
84 count = buffer->attr->show(buffer->item, buffer->page); in fill_read_buffer()
91 buffer->needs_read_fill = 0; in fill_read_buffer()
92 buffer->count = count; in fill_read_buffer()
99 * @buf: buffer to fill.
107 * We call fill_read_buffer() to allocate and fill the buffer from the
109 * the beginning of the file). That should fill the entire buffer with
111 * We then call flush_read_buffer() to copy the buffer to userspace
118 struct configfs_buffer *buffer = file->private_data; in configfs_read_file() local
121 mutex_lock(&buffer->mutex); in configfs_read_file()
122 if (buffer->needs_read_fill) { in configfs_read_file()
123 retval = fill_read_buffer(file, buffer); in configfs_read_file()
128 __func__, count, *ppos, buffer->page); in configfs_read_file()
129 retval = simple_read_from_buffer(buf, count, ppos, buffer->page, in configfs_read_file()
130 buffer->count); in configfs_read_file()
132 mutex_unlock(&buffer->mutex); in configfs_read_file()
139 * @buf: buffer to fill.
147 * We check whether we need to refill the buffer. If so we will
149 * will pass a NULL as a buffer pointer, which the attributes' method
150 * will use to return the size of the buffer required. If no error
151 * occurs we will allocate the buffer using vmalloc and call
152 * attr->read() again passing that buffer as an argument.
161 struct configfs_buffer *buffer = file->private_data; in configfs_read_bin_file() local
165 mutex_lock(&buffer->mutex); in configfs_read_bin_file()
168 if (buffer->write_in_progress) { in configfs_read_bin_file()
172 buffer->read_in_progress = true; in configfs_read_bin_file()
174 if (buffer->needs_read_fill) { in configfs_read_bin_file()
178 len = buffer->bin_attr->read(buffer->item, NULL, 0); in configfs_read_bin_file()
188 if (buffer->cb_max_size && len > buffer->cb_max_size) { in configfs_read_bin_file()
193 buffer->bin_buffer = vmalloc(len); in configfs_read_bin_file()
194 if (buffer->bin_buffer == NULL) { in configfs_read_bin_file()
198 buffer->bin_buffer_size = len; in configfs_read_bin_file()
200 /* perform second read to fill buffer */ in configfs_read_bin_file()
203 len = buffer->bin_attr->read(buffer->item, in configfs_read_bin_file()
204 buffer->bin_buffer, len); in configfs_read_bin_file()
210 vfree(buffer->bin_buffer); in configfs_read_bin_file()
211 buffer->bin_buffer_size = 0; in configfs_read_bin_file()
212 buffer->bin_buffer = NULL; in configfs_read_bin_file()
216 buffer->needs_read_fill = 0; in configfs_read_bin_file()
219 retval = simple_read_from_buffer(buf, count, ppos, buffer->bin_buffer, in configfs_read_bin_file()
220 buffer->bin_buffer_size); in configfs_read_bin_file()
222 mutex_unlock(&buffer->mutex); in configfs_read_bin_file()
228 * fill_write_buffer - copy buffer from userspace.
229 * @buffer: data buffer for file.
233 * Allocate @buffer->page if it hasn't been already, then
234 * copy the user-supplied buffer into it.
238 fill_write_buffer(struct configfs_buffer * buffer, const char __user * buf, size_t count) in fill_write_buffer() argument
242 if (!buffer->page) in fill_write_buffer()
243 buffer->page = (char *)__get_free_pages(GFP_KERNEL, 0); in fill_write_buffer()
244 if (!buffer->page) in fill_write_buffer()
249 error = copy_from_user(buffer->page,buf,count); in fill_write_buffer()
250 buffer->needs_read_fill = 1; in fill_write_buffer()
253 buffer->page[count] = 0; in fill_write_buffer()
258 flush_write_buffer(struct file *file, struct configfs_buffer *buffer, size_t count) in flush_write_buffer() argument
265 res = buffer->attr->store(buffer->item, buffer->page, count); in flush_write_buffer()
282 * write, so we don't support them. We expect the entire buffer to come
285 * the value you're changing, then write entire buffer back.
291 struct configfs_buffer *buffer = file->private_data; in configfs_write_file() local
294 mutex_lock(&buffer->mutex); in configfs_write_file()
295 len = fill_write_buffer(buffer, buf, count); in configfs_write_file()
297 len = flush_write_buffer(file, buffer, len); in configfs_write_file()
300 mutex_unlock(&buffer->mutex); in configfs_write_file()
312 * We buffer the consecutive writes (binary attribute files do not
313 * support lseek) in a continuously growing buffer, but we don't
321 struct configfs_buffer *buffer = file->private_data; in configfs_write_bin_file() local
325 mutex_lock(&buffer->mutex); in configfs_write_bin_file()
328 if (buffer->read_in_progress) { in configfs_write_bin_file()
332 buffer->write_in_progress = true; in configfs_write_bin_file()
334 /* buffer grows? */ in configfs_write_bin_file()
335 if (*ppos + count > buffer->bin_buffer_size) { in configfs_write_bin_file()
337 if (buffer->cb_max_size && in configfs_write_bin_file()
338 *ppos + count > buffer->cb_max_size) { in configfs_write_bin_file()
350 if (buffer->bin_buffer) { in configfs_write_bin_file()
351 memcpy(tbuf, buffer->bin_buffer, in configfs_write_bin_file()
352 buffer->bin_buffer_size); in configfs_write_bin_file()
353 vfree(buffer->bin_buffer); in configfs_write_bin_file()
357 memset(tbuf + buffer->bin_buffer_size, 0, in configfs_write_bin_file()
358 *ppos + count - buffer->bin_buffer_size); in configfs_write_bin_file()
359 buffer->bin_buffer = tbuf; in configfs_write_bin_file()
360 buffer->bin_buffer_size = *ppos + count; in configfs_write_bin_file()
363 len = simple_write_to_buffer(buffer->bin_buffer, in configfs_write_bin_file()
364 buffer->bin_buffer_size, ppos, buf, count); in configfs_write_bin_file()
366 mutex_unlock(&buffer->mutex); in configfs_write_bin_file()
375 struct configfs_buffer *buffer; in __configfs_open_file() local
379 buffer = kzalloc(sizeof(struct configfs_buffer), GFP_KERNEL); in __configfs_open_file()
380 if (!buffer) in __configfs_open_file()
389 buffer->item = to_item(dentry->d_parent); in __configfs_open_file()
390 if (!buffer->item) in __configfs_open_file()
398 buffer->bin_attr = to_bin_attr(dentry); in __configfs_open_file()
399 buffer->cb_max_size = buffer->bin_attr->cb_max_size; in __configfs_open_file()
401 buffer->attr = attr; in __configfs_open_file()
404 buffer->owner = attr->ca_owner; in __configfs_open_file()
407 if (!try_module_get(buffer->owner)) in __configfs_open_file()
411 if (!buffer->item->ci_type) in __configfs_open_file()
414 buffer->ops = buffer->item->ci_type->ct_item_ops; in __configfs_open_file()
425 if ((type & CONFIGFS_ITEM_BIN_ATTR) && !buffer->bin_attr->write) in __configfs_open_file()
438 if ((type & CONFIGFS_ITEM_BIN_ATTR) && !buffer->bin_attr->read) in __configfs_open_file()
442 mutex_init(&buffer->mutex); in __configfs_open_file()
443 buffer->needs_read_fill = 1; in __configfs_open_file()
444 buffer->read_in_progress = false; in __configfs_open_file()
445 buffer->write_in_progress = false; in __configfs_open_file()
446 file->private_data = buffer; in __configfs_open_file()
451 module_put(buffer->owner); in __configfs_open_file()
453 config_item_put(buffer->item); in __configfs_open_file()
456 kfree(buffer); in __configfs_open_file()
463 struct configfs_buffer *buffer = filp->private_data; in configfs_release() local
465 module_put(buffer->owner); in configfs_release()
466 if (buffer->page) in configfs_release()
467 free_page((unsigned long)buffer->page); in configfs_release()
468 mutex_destroy(&buffer->mutex); in configfs_release()
469 kfree(buffer); in configfs_release()
485 struct configfs_buffer *buffer = file->private_data; in configfs_release_bin_file() local
487 buffer->read_in_progress = false; in configfs_release_bin_file()
489 if (buffer->write_in_progress) { in configfs_release_bin_file()
491 buffer->write_in_progress = false; in configfs_release_bin_file()
496 buffer->bin_attr->write(buffer->item, in configfs_release_bin_file()
497 buffer->bin_buffer, in configfs_release_bin_file()
498 buffer->bin_buffer_size); in configfs_release_bin_file()
502 vfree(buffer->bin_buffer); in configfs_release_bin_file()
503 buffer->bin_buffer = NULL; in configfs_release_bin_file()
504 buffer->bin_buffer_size = 0; in configfs_release_bin_file()
505 buffer->needs_read_fill = 1; in configfs_release_bin_file()