tree 3d53ed7254c613ef8d8de36fdceda25bc493f4f7
parent 637d020a02cd734bf27acfc56c6d942cddd9eb80
author Abhishek Kulkarni <adkulkar@umail.iu.edu> 1253728827 -0500
committer Eric Van Hensbergen <ericvh@strongmad.austin.ibm.com> 1253729026 -0500

9p: Add fscache support to 9p

This patch adds a persistent, read-only caching facility for
9p clients using the FS-Cache caching backend.

When the fscache facility is enabled, each inode is associated
with a corresponding vcookie which is an index into the FS-Cache
indexing tree. The FS-Cache indexing tree is indexed at 3 levels:
- session object associated with each mount.
- inode/vcookie
- actual data (pages)

A cache tag is chosen randomly for each session. These tags can
be read off /sys/fs/9p/caches and can be passed as a mount-time
parameter to re-attach to the specified caching session.

Signed-off-by: Abhishek Kulkarni <adkulkar@umail.iu.edu>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>