Commit Graph

9 Commits

Author SHA1 Message Date
Liu Bo
3f09eff6c5 vhost_user_fs: add fs cache request operations
This introduces setupmapping and removemapping methods to server.rs,
passthrough.rs and filesystem.rs in order to support virtiofs dax mode
inside guest.

Since we don't really want the server.rs to know that it is dealing with
vhost-user specifically, this is making it more generic by adding a new
trait which has three functions map()/unmap()/sync() corresponding to
fs_slave_{map, unmap, sync}, server.rs will take anything that implements
the trait.

Signed-off-by: Liu Bo <bo.liu@linux.alibaba.com>
2020-02-19 07:52:50 +00:00
Sebastien Boeuf
5c128023da vhost_user_fs: Add Server structure to consume FileSystem implementation
Add a Server type that links the FUSE protocol with the virtio
transport. It parses messages sent on the virtio queue and then
calls the appropriate method of the Filesystem trait.

This code has been ported over from crosvm commit
961461350c0b6824e5f20655031bf6c6bf6b7c30.

One small modification has been applied to the original code. Because
cloud-hypervisor didn't have the macro used by crosvm, the match
statement in the function handle_message() has been updated.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
2019-11-22 22:17:47 +01:00
Sebastien Boeuf
e1fccc3615 vhost_user_fs: Add virtio descriptor helper traits
Introduce helpers to split a virtio descriptor into its readable part on
one side, and into its writable part on the other side. This is useful
to separate the request from the reply.

This code has been ported over from crosvm commit
961461350c0b6824e5f20655031bf6c6bf6b7c30.

Two important modifications have been applied to the original code:
- GuestMemory is replaced by GuestMemoryMmap from the vm-memory crate,
  which comes with different ways of accessing the memory regions.
- VolatileSlice has different methods, which means the code has been
  updated accordingly.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
2019-11-22 22:17:47 +01:00
Sebastien Boeuf
5f7935f8e0 vhost_user_fs: Add file traits to handle writing volatile memory
The vm_memory implementation for VolatileSlice is able to read and write
to a source or destination which implements a Read or Write trait.

Unfortunately, this is not enough for this specific use case as we need
to be able to write to a file at a specific offset, which is not
provided by the Read or Write trait.

This code has been ported over from crosvm commit
961461350c0b6824e5f20655031bf6c6bf6b7c30.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
2019-11-22 22:17:47 +01:00
Sebastien Boeuf
e33ccb0c95 vhost_user_fs: Implement FileSystem trait for Passthrough
Add a "passthrough" file system implementation that just forwards its
requests to the appropriate system call.

This code has been ported over from crosvm commit
961461350c0b6824e5f20655031bf6c6bf6b7c30.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
2019-11-22 22:17:47 +01:00
Sebastien Boeuf
1b76c0a183 vhost_user_fs: Add FileSystem trait
Add the `Filesystem` trait, which is the main interface between the
transport and the actual file system implementation.

This code has been ported over from crosvm commit
961461350c0b6824e5f20655031bf6c6bf6b7c30.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
2019-11-22 22:17:47 +01:00
Sebastien Boeuf
1e65bda0a7 vhost_user_fs: Add multikey module
The multikey module provides a BTreeMap implementation that can use one
of 2 different kinds of keys to look up a value. This is needed by the
virtio-fs server since it needs to be able to look up keys either by
u64 or by a (ino_t, dev_t) pair.

This code has been ported over from crosvm commit
961461350c0b6824e5f20655031bf6c6bf6b7c30.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
2019-11-22 22:17:47 +01:00
Sebastien Boeuf
cd1684bd2e vhost_user_fs: Add FUSE definitions
To be able to deal with FUSE requests, this commit introduces FUSE
definitions, copied over from the crosvm commit
961461350c0b6824e5f20655031bf6c6bf6b7c30.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
2019-11-22 22:17:47 +01:00
Sebastien Boeuf
03361a6c29 vhost_user_fs: Add new crate
This new crate will be dedicated to vhost_user_fs specific code that can
be used as a library from the vhost-user-fs daemon.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
2019-11-22 22:17:47 +01:00