diff options
| -rw-r--r-- | OvmfPkg/Include/IndustryStandard/VirtioFs.h | 8 | ||||
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/FuseForget.c | 85 | ||||
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/VirtioFsDxe.h | 6 | ||||
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf | 1 |
4 files changed, 100 insertions, 0 deletions
diff --git a/OvmfPkg/Include/IndustryStandard/VirtioFs.h b/OvmfPkg/Include/IndustryStandard/VirtioFs.h index 67fcf975e8..0241daf1e8 100644 --- a/OvmfPkg/Include/IndustryStandard/VirtioFs.h +++ b/OvmfPkg/Include/IndustryStandard/VirtioFs.h @@ -85,6 +85,7 @@ typedef struct { // FUSE operation codes.
//
typedef enum {
+ VirtioFsFuseOpForget = 2,
VirtioFsFuseOpRelease = 18,
VirtioFsFuseOpInit = 26,
VirtioFsFuseOpOpenDir = 27,
@@ -113,6 +114,13 @@ typedef struct { } VIRTIO_FS_FUSE_RESPONSE;
//
+// Header for VirtioFsFuseOpForget.
+//
+typedef struct {
+ UINT64 NumberOfLookups;
+} VIRTIO_FS_FUSE_FORGET_REQUEST;
+
+//
// Header for VirtioFsFuseOpRelease and VirtioFsFuseOpReleaseDir.
//
typedef struct {
diff --git a/OvmfPkg/VirtioFsDxe/FuseForget.c b/OvmfPkg/VirtioFsDxe/FuseForget.c new file mode 100644 index 0000000000..fdee42cffb --- /dev/null +++ b/OvmfPkg/VirtioFsDxe/FuseForget.c @@ -0,0 +1,85 @@ +/** @file
+ FUSE_FORGET wrapper for the Virtio Filesystem device.
+
+ Copyright (C) 2020, Red Hat, Inc.
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include "VirtioFsDxe.h"
+
+/**
+ Make the Virtio Filesysem device drop one reference count from a NodeId that
+ the driver looked up by filename.
+
+ Send the FUSE_FORGET request to the Virtio Filesysem device for this. Unlike
+ most other FUSE requests, FUSE_FORGET doesn't elicit a response, not even the
+ common VIRTIO_FS_FUSE_RESPONSE header.
+
+ The function may only be called after VirtioFsFuseInitSession() returns
+ successfully and before VirtioFsUninit() is called.
+
+ @param[in,out] VirtioFs The Virtio Filesystem device to send the FUSE_FORGET
+ request to. On output, the FUSE request counter
+ "VirtioFs->RequestId" will have been incremented.
+
+ @param[in] NodeId The inode number that the client learned by way of
+ lookup, and that the server should now un-reference
+ exactly once.
+
+ @retval EFI_SUCCESS The FUSE_FORGET request has been submitted.
+
+ @return Error codes propagated from VirtioFsSgListsValidate(),
+ VirtioFsFuseNewRequest(), VirtioFsSgListsSubmit().
+**/
+EFI_STATUS
+VirtioFsFuseForget (
+ IN OUT VIRTIO_FS *VirtioFs,
+ IN UINT64 NodeId
+ )
+{
+ VIRTIO_FS_FUSE_REQUEST CommonReq;
+ VIRTIO_FS_FUSE_FORGET_REQUEST ForgetReq;
+ VIRTIO_FS_IO_VECTOR ReqIoVec[2];
+ VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
+ EFI_STATUS Status;
+
+ //
+ // Set up the scatter-gather list (note: only request).
+ //
+ ReqIoVec[0].Buffer = &CommonReq;
+ ReqIoVec[0].Size = sizeof CommonReq;
+ ReqIoVec[1].Buffer = &ForgetReq;
+ ReqIoVec[1].Size = sizeof ForgetReq;
+ ReqSgList.IoVec = ReqIoVec;
+ ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
+
+ //
+ // Validate the scatter-gather list (request only); calculate the total
+ // transfer size.
+ //
+ Status = VirtioFsSgListsValidate (VirtioFs, &ReqSgList, NULL);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ //
+ // Populate the common request header.
+ //
+ Status = VirtioFsFuseNewRequest (VirtioFs, &CommonReq, ReqSgList.TotalSize,
+ VirtioFsFuseOpForget, NodeId);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ //
+ // Populate the FUSE_FORGET-specific fields.
+ //
+ ForgetReq.NumberOfLookups = 1;
+
+ //
+ // Submit the request. There's not going to be a response.
+ //
+ Status = VirtioFsSgListsSubmit (VirtioFs, &ReqSgList, NULL);
+ return Status;
+}
diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h index 34574d0596..68ed6cd7e6 100644 --- a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h +++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h @@ -196,6 +196,12 @@ VirtioFsErrnoToEfiStatus ( //
EFI_STATUS
+VirtioFsFuseForget (
+ IN OUT VIRTIO_FS *VirtioFs,
+ IN UINT64 NodeId
+ );
+
+EFI_STATUS
VirtioFsFuseReleaseFileOrDir (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf index 28e66082ec..baeb741be1 100644 --- a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf +++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf @@ -82,6 +82,7 @@ [Sources]
DriverBinding.c
+ FuseForget.c
FuseInit.c
FuseOpenDir.c
FuseRelease.c
|