COMPUTER
First Claim
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1. A computer comprising:
- a storing unit that stores a data file; and
a processor that reads out the data file from the storing unit, wherein the storing unit storesa past image that is a past version of the data file, anda present access control list in which access right of a user to the data file and access right of a user to the past image are described, andwhen the processor receives an access request to the past image from the user, the processor reads out access right of the user to the past image from the present access control list and validates, according to a description of the present access control list, whether the user has right for accessing the past image.
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Abstract
It is an object of the present invention to provide a technique for managing, in a file system that stores past images of a data file, access right to the past images.
A computer according to the present invention includes a past access control list in which access right of a user to past images and a period in which the access right is applied are described and validates accessibility to the past images using the past access control list (see FIG. 5).
31 Citations
14 Claims
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1. A computer comprising:
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a storing unit that stores a data file; and a processor that reads out the data file from the storing unit, wherein the storing unit stores a past image that is a past version of the data file, and a present access control list in which access right of a user to the data file and access right of a user to the past image are described, and when the processor receives an access request to the past image from the user, the processor reads out access right of the user to the past image from the present access control list and validates, according to a description of the present access control list, whether the user has right for accessing the past image. - View Dependent Claims (2, 3, 5, 6, 14)
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4. A computer comprising:
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a storing unit that stores a data file; and a processor that reads out the data file from the storing unit, wherein the storing unit stores a past image that is a past version of the data file, a present access control list in which access right of a user to the data file is described, and a past access control list in which access right of a user to the past image is described, and when the processor receives the period set as the target for rewriting the access right of the user to the past image and the contents of the rewriting as a rewriting request for the past access control list, the processor rewrites the contents of the past access control list corresponding to the period according to the rewriting contents, and when the processor receives an access request to the past image from the user, the processor reads out access right of the user to the past image from the past access control list and validates, according to a description of the past access control list, whether the user has right for accessing the past image.
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7. A computer comprising:
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a storing unit that stores a data file; and a processor that reads out the data file from the storing unit, wherein the storing unit stores a past image that is a past version of the data file, a present access control list in which access right of a user to the data file is described, and a past access control list in which access right of a user to the past image is described, and if the access right described in the present access control list and the access right described in the past access control list coincide with each other, the processor validates accessibility according to coinciding contents of the access right, and if the access right described in the present access control list and the access right described in the past access control list do not coincide with each other, the processor compares the access rights and determines to which of the access rights priority should be given. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification