Maintaining and recomputing reference counts in a persistent memory file system

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United States of America

PATENT NO 12248376
APP PUB NO 20240241801A1
SERIAL NO

18623387

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Abstract

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Techniques are provided for maintaining and recomputing reference counts in a persistent memory file system of a node. Primary reference counts are maintained for pages within persistent memory of the node. In response to receiving a first operation to link a page into a persistent memory file system of the persistent memory, a primary reference count of the page is incremented before linking the page into the persistent memory file system. In response to receiving a second operation to unlink the page from the persistent memory file system, the page is unlinked from the persistent memory file system before the primary reference count is decremented. Upon the node recovering from a crash, the persistent memory file system is traversed in order to update shadow reference counts for the pages with correct reference count values, which are used to overwrite the primary reference counts with the correct reference count values.

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Patent Owner(s)

Patent OwnerAddress
NETAPP INCSAN JOSE CA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Curtis-Maury, Matthew Fontaine Apex, US 33 53
Devadas, Vinay Apex, US 38 53
Subramanian, Ananthan San Ramon, US 117 1174

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