Managing extent sharing between snapshots using mapping addresses

• Main Authors: Sarkar, Subhradyuti, Wang, Wenguang, Xiang, Enning, Singh, Pranay
• Format: Patent
• Language: English
• Published: 21.11.2023
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

The present disclosure is related to methods, systems, and machine-readable media for managing extent sharing between snapshots using mapping addresses. A first mapping address can be assigned to a first extent responsive to a request to write the first extent. A second mapping address can be assigned to a second extent responsive to a request to write the second extent. A snapshot can be created. A snapshot mapping address, that is monotonically increased from the second mapping address, can be assigned to the snapshot. A third mapping address, that is monotonically increased from the second mapping address, can be assigned to a third extent of the snapshot responsive to a request to write the third extent. An ownership status of each of the first extent, the second extent, and the third extent can be determined based respectively on: a comparison between the first mapping address and the snapshot mapping address, a comparison between the second mapping address and the snapshot mapping address, and a comparison between the third mapping address and the snapshot mapping address.