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Linux 2005
Conference and Tutorials
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Thursday 4th to Sunday 7th August
University of Wales, Swansea

Linux 2005

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Jan Blunck

VFS based Union Mounts for Linux

Unlike a traditional mount that hides the contents of the mountpoint, a union mount presents a view as if the filesystems were merged together. Although only the top layer filesystem of the union stack can be altered, it appears as if it allows anything to be deleted or modified. Files in the lower layer may be deleted with whiteouts in the top layer. Files to be modified are automatically copied to the top layer.

For a VFS based implementation, heavy changes to the VFS itself and to some low-level filesystems were necessary. This includes modification of lookup and readdir operations as well as the persistent storage of a whiteout dentry type.


S  P O N S O R S
Red Hat
Red Hat
ITWales
ITWales
Astaro Internet Security
Astaro Internet Security
PepLink
PePLink

M  E D I A   S  P O N S O R S
Linux Magazine
Linux Magazine
ITWales
ITWales
Linux User
Linux User & Developer
Ping Wales
Ping Wales
Need To Know
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The Register
The Register

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