Invention Grant
US09075813B2 Saving a snapshot of free space of a file system on persistent storage
有权
在持久存储器上保存文件系统的可用空间的快照
- Patent Title: Saving a snapshot of free space of a file system on persistent storage
- Patent Title (中): 在持久存储器上保存文件系统的可用空间的快照
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Application No.: US13233605Application Date: 2011-09-15
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Publication No.: US09075813B2Publication Date: 2015-07-07
- Inventor: Josef Michael Bacik
- Applicant: Josef Michael Bacik
- Applicant Address: US NC Raleigh
- Assignee: Red Hat, Inc.
- Current Assignee: Red Hat, Inc.
- Current Assignee Address: US NC Raleigh
- Agency: Lowenstein Sandler LLP
- Main IPC: G06F12/00
- IPC: G06F12/00 ; G06F17/30 ; G06F12/08
Abstract:
A mechanism for saving a snapshot of free space of a file system on persistent storage is disclosed. A method of the invention includes determining whether generation numbers stored in each of a free space cache inode of an on-disk free space cache of a block group, a free space cache item, and a free space cache header are valid, determining whether a checksum generated for a first page of the free space cache matches a checksum stored in the file system and associated with the free space cache, and adding entries stored in the on-disk free space cache to an in-memory free space cache for the block group kept in volatile memory of a computing device, wherein the on-disk free space cache is stored in persistent data storage indexed by a file system of the computing device.
Public/Granted literature
- US20130073813A1 Mechanism for Saving a Snapshot of Free Space of a File System on Persistent Storage Public/Granted day:2013-03-21
Information query
