최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0582465 (1996-01-03) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 648 인용 특허 : 12 |
Various versions of a computer file are provided without requiring copying the file or logging changed data, so that the files have consistent user data. A program module responds to a system call argument and allocates another node in file system tables and copies metadata information from the old
Various versions of a computer file are provided without requiring copying the file or logging changed data, so that the files have consistent user data. A program module responds to a system call argument and allocates another node in file system tables and copies metadata information from the old node into the new node, so that both nodes contain the same data block allocation information. Portions of the module set shadow pointers in the old node to point to the new node, and in the new node to point to the old node. Changes to data are made with respect to the new node and fresh physical data blocks are allocated for the changed blocks. A method includes the steps of allocating a new node for storing file allocation information for another version of an existing file; logically connecting the new node to the existing node for file name and other purposes; and replacing node identification information in the directory with the new mode identification. In other steps the method replaces the current node identification information of a file in the directory with previous node identification information obtained from the current node; and logically disconnects the current node from the previous node.
[ What is claimed is:] [19.] In a computer having an operating system including a file system, for executing an application program, a method of consistently storing user data from said application program into said file system comprising the computer implemented steps of:A) receiving from said appl
[ What is claimed is:] [19.] In a computer having an operating system including a file system, for executing an application program, a method of consistently storing user data from said application program into said file system comprising the computer implemented steps of:A) receiving from said application program, an argument indicating that a version of an existing file is to be created;B) allocating a version index structure;C) copying from an original index structure into said version index structure, file storage block allocation information;D) connecting said version index structure to said original index structure of said existing file;E) resetting a connection to said original index structure of said existing file from a record of a name of said existing file and connecting said record of said name of said existing file to said version index structure;wherein the connecting of step D) further comprises the steps of:D1) setting a next pointer value in said original index structure to a numerical value of said version index structure; andD2) setting a back pointer value in said version index structure to a numerical value of said original index structure.
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