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1. 发明授权

US5926821A File control method and system for allocating a free block to a file when the previously allocated block is to be written to 失效
标题翻译：当要写入先前分配的块时，用于将空闲块分配给文件的文件控制方法和系统
公开(公告)号：US5926821A
公开(公告)日：1999-07-20
申请号：US909073
申请日：1997-08-14
申请人： Nozomu Hirose , Kumiko Yagi , Miho Iwanaga , Hirofumi Yamashita
发明人： Nozomu Hirose , Kumiko Yagi , Miho Iwanaga , Hirofumi Yamashita
IPC分类号： G06F12/00 , G06F3/06 , G06F17/30
CPC分类号： G06F3/0619 , G06F3/0643 , G06F3/0674 , Y10S707/99953
摘要： A file control method by which a number of a block first allocated to a file is saved in an external memory and data and a number of a block to be next linked or a flag indicative of an idle block are recorded in each block to thereby restore the file information, and a version of each block is recorded therein to thereby allow easy access to a data block of the specified version. A number of a head block in the file is always saved in an allocated block list of a file information area. The data and the number of the block to be next linked or the identifier indicative of an idle block are recorded in each block of the data storage area. A file control program, when it is desired to add new data to the file, allocates a spare idle block to the file. When file writing operation is interrupted, the head block number and the next block number of each block in the file information area are traced up to the idle block to thereby restore a file information table.
摘要翻译：将首先分配给文件的块的数量保存在外部存储器中的文件控制方法，并且在每个块中记录数据和要下一个链接的块的数量或表示空闲块的标志，从而恢复文件信息和每个块的版本被记录在其中，从而允许容易地访问指定版本的数据块。文件中的头块的数量总是保存在文件信息区域的分配的块列表中。将要下一个链接的块的数据和编号或指示空闲块的标识符记录在数据存储区的每个块中。文件控制程序当需要向文件添加新数据时，将一个备用空闲块分配给该文件。当文件写入操作中断时，文件信息区域中的每个块的头块号和下一个块号被追溯到空闲块，从而恢复文件信息表。

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