PRESERVING PAST STATES OF FILE SYSTEM NODES

摘要

A selective tuple versioning is used on a files system for preserving past states of file system nodes by adding a bitmap to a row for a node within a file system table for preserving the past state of the node in a file system, receiving a request for updating the node along with a node identification (ID) and associated attributes of the node needing to be updated, generating a second time value indicating the time of the updating, and duplicating the row for the node into a new row in the file system table with an end time set equal to the second time value if the bit in the bitmap for the node is set.

主权项

1. A method for preserving past states of file system nodes using selective tuple versioning in a computing environment using a processor device, comprising:
using the selective tuple versioning on a file system table by adding a bitmap to a row for a node within a file system table for preserving the past state of the node in a file system;
receiving a request for updating the node along with a node identification (ID) and associated attributes of the node needing to be updated,generating a second time value indicating the time of the updating, and
duplicating the row for the node into a new row in the file system table with an end time set equal to the second time value if the bit in the bitmap for the node is set.