OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_WRITE

Add the VirtioFsFuseWrite() function, for sending the FUSE_WRITE command
to the Virtio Filesystem device.

(For avoiding oversized FUSE_WRITE commands, save the maximum write buffer
size that is advertized by the FUSE server, in the session init code.)

Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20201216211125.19496-39-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/OvmfPkg/Include/IndustryStandard/VirtioFs.h b/OvmfPkg/Include/IndustryStandard/VirtioFs.h
index fa8c40019f..0b7b3ff80e 100644
--- a/OvmfPkg/Include/IndustryStandard/VirtioFs.h
+++ b/OvmfPkg/Include/IndustryStandard/VirtioFs.h
@@ -153,6 +153,7 @@ typedef enum {
   VirtioFsFuseOpRmDir       = 11,

   VirtioFsFuseOpOpen        = 14,

   VirtioFsFuseOpRead        = 15,

+  VirtioFsFuseOpWrite       = 16,

   VirtioFsFuseOpStatFs      = 17,

   VirtioFsFuseOpRelease     = 18,

   VirtioFsFuseOpFsync       = 20,

@@ -283,6 +284,24 @@ typedef struct {
 } VIRTIO_FS_FUSE_READ_REQUEST;

 

 //

+// Headers for VirtioFsFuseOpWrite.

+//

+typedef struct {

+  UINT64 FileHandle;

+  UINT64 Offset;

+  UINT32 Size;

+  UINT32 WriteFlags;

+  UINT64 LockOwner;

+  UINT32 Flags;

+  UINT32 Padding;

+} VIRTIO_FS_FUSE_WRITE_REQUEST;

+

+typedef struct {

+  UINT32 Size;

+  UINT32 Padding;

+} VIRTIO_FS_FUSE_WRITE_RESPONSE;

+

+//

 // Header for VirtioFsFuseOpStatFs.

 //

 typedef struct {