Overlay
Copy on Write
Inode Mapping
Change Tracking
Storage System
File Attributes
| Status | Released |
| Description | The contents of one filesystem can be overlayed with the contents of another filesystem. |
| Details | Overlay |
| Status | Released |
| Description | Files in the base filesystem are copied into the storage filesystem on write so that the original files remain intact while the processes accessing those files can modify their content as-needed. |
| Details | Copy on Write |
| Status | Released |
| Description | Inodes in the base and storage filesystems are mapped to overlay filesystem inodes by device and inode number. |
| Details | Inode Mapping |
| Status | Released |
| Description | Changes to inode attributes and directory contents are tracked by the Overlay Filesystem for the base filesystem. |
| Details | Change Tracking |
| Status | Partially Implemented |
| Description | Storage for the Overlay Filesystem's inodes, mappings, directory contents, and file contents can be supplied by separate subsystems using the Storage System registration. |
| Details | Storage System |
| Status | Under Consideration |
| Description | Files can be tagged with attribute name/value pairs transparent to the filesystem user. These attributes can be retrieved using special commands or library calls. |
| Details | File Attributes |
Last Updated: Feburary 21, 2003