UFFS 文件系统

5 uffs文件系统报错写不进去数据

发布于 2021-11-08 19:09:20 浏览：1101 订阅该版

/** 
 * get a page buffer
 * \param[in] dev uffs device
 * \param[in] type dir, file or data ?
 * \param[in] node node on the tree
 * \param[in] page_id page_id
 * \param[in] oflag the open flag of current file/dir object
 * \return return the buffer if found in buffer list, if not found in 
 *		buffer list, it will get a free buffer, and load data from flash.
 *		return NULL if not free buffer.
 */
uffs_Buf *uffs_BufGetEx(struct uffs_DeviceSt *dev,
						u8 type, TreeNode *node, u16 page_id, int oflag)
{
	uffs_Buf *buf;
	u16 parent, serial, block, page;
	uffs_BlockInfo *bc;

switch (type) {
	case UFFS_TYPE_DIR:
		parent = node->u.dir.parent;
		serial = node->u.dir.serial;
		block = node->u.dir.block;
		break;
	case UFFS_TYPE_FILE:
		parent = node->u.file.parent;
		serial = node->u.file.serial;
		block = node->u.file.block;
		break;
	case UFFS_TYPE_DATA:
		parent = node->u.data.parent;
		serial = node->u.data.serial;
		block = node->u.data.block;
		break;
	default:
		uffs_Perror(UFFS_MSG_SERIOUS, "unknown type");
		return NULL;
	}

buf = uffs_BufFind(dev, parent, serial, page_id);
	if (buf) {
		buf->ref_count++;
		return buf;
	}

buf = _FindFreeBuf(dev);
	if (buf == NULL) {
		uffs_BufFlushMostDirtyGroup(dev);
		buf = _FindFreeBuf(dev);
		if (buf == NULL) {
			uffs_Perror(UFFS_MSG_SERIOUS, "no free page buf!");
			return NULL;
		}

/* Note: if uffs_BufFlushMostDirtyGroup() flush the same block as we'll write to,
		 *	the block will be changed to a new one! (and the content of 'node' is changed).
		 *	So here we need to update block number from the new 'node'.
		 */
		switch (type) {
		case UFFS_TYPE_DIR:
			block = node->u.dir.block;
			break;
		case UFFS_TYPE_FILE:
			block = node->u.file.block;
			break;
		case UFFS_TYPE_DATA:
			block = node->u.data.block;
			break;
		default:
			uffs_Perror(UFFS_MSG_SERIOUS, "unknown type");
			return NULL;
		}
	}

bc = uffs_BlockInfoGet(dev, block);
	if (bc == NULL) {
		uffs_Perror(UFFS_MSG_SERIOUS, "Can't get block info!");
		return NULL;
	}
	
	page = uffs_FindPageInBlockWithPageId(dev, bc, page_id);
	if (page == UFFS_INVALID_PAGE) {
		uffs_BlockInfoPut(dev, bc);
		uffs_Perror(UFFS_MSG_SERIOUS, "can't find right page ? block %d page_id %d", bc->block, page_id);
		return NULL;
	}
	page = uffs_FindBestPageInBlock(dev, bc, page);
	if (!uffs_Assert(page != UFFS_INVALID_PAGE, "got an invalid page?\n"))
		return NULL;

uffs_BlockInfoPut(dev, bc);

buf->mark = UFFS_BUF_EMPTY;
	buf->type = type;
	buf->parent = parent;
	buf->serial = serial;
	buf->page_id = page_id;

if (UFFS_FLASH_HAVE_ERR(uffs_FlashReadPage(dev, block, page, buf, oflag & UO_NOECC ? U_TRUE : U_FALSE))) {
		uffs_Perror(UFFS_MSG_SERIOUS, "can't load page from flash !");
		return NULL;
	}

buf->data_len = TAG_DATA_LEN(GET_TAG(bc, page));
	buf->mark = UFFS_BUF_VALID;
	buf->ref_count++;

_MoveNodeToHead(dev, buf);
	
	return buf;

}

日志打印结果：pbuf: can't find right page ? block 52 page_id 63
fs  : can't get buffer ?