[edk2-devel] [edk2 PATCH 14/48] OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_FLUSH
Laszlo Ersek
lersek at redhat.com
Wed Dec 16 21:10:51 UTC 2020
Add the VirtioFsFuseFlush() function, for sending the FUSE_FLUSH command
to the Virtio Filesystem device.
Cc: Ard Biesheuvel <ard.biesheuvel at arm.com>
Cc: Jordan Justen <jordan.l.justen at intel.com>
Cc: Philippe Mathieu-Daudé <philmd at redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097
Signed-off-by: Laszlo Ersek <lersek at redhat.com>
---
OvmfPkg/Include/IndustryStandard/VirtioFs.h | 11 ++
OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf | 1 +
OvmfPkg/VirtioFsDxe/VirtioFsDxe.h | 7 ++
OvmfPkg/VirtioFsDxe/FuseFlush.c | 111 ++++++++++++++++++++
4 files changed, 130 insertions(+)
diff --git a/OvmfPkg/Include/IndustryStandard/VirtioFs.h b/OvmfPkg/Include/IndustryStandard/VirtioFs.h
index 797d94a39a39..fec2f4be531f 100644
--- a/OvmfPkg/Include/IndustryStandard/VirtioFs.h
+++ b/OvmfPkg/Include/IndustryStandard/VirtioFs.h
@@ -83,16 +83,17 @@ typedef struct {
//
// FUSE operation codes.
//
typedef enum {
VirtioFsFuseOpForget = 2,
VirtioFsFuseOpRelease = 18,
VirtioFsFuseOpFsync = 20,
+ VirtioFsFuseOpFlush = 25,
VirtioFsFuseOpInit = 26,
VirtioFsFuseOpOpenDir = 27,
VirtioFsFuseOpReleaseDir = 29,
VirtioFsFuseOpFsyncDir = 30,
} VIRTIO_FS_FUSE_OPCODE;
#pragma pack (1)
//
@@ -136,16 +137,26 @@ typedef struct {
// Header for VirtioFsFuseOpFsync and VirtioFsFuseOpFsyncDir.
//
typedef struct {
UINT64 FileHandle;
UINT32 FsyncFlags;
UINT32 Padding;
} VIRTIO_FS_FUSE_FSYNC_REQUEST;
+//
+// Header for VirtioFsFuseOpFlush.
+//
+typedef struct {
+ UINT64 FileHandle;
+ UINT32 Unused;
+ UINT32 Padding;
+ UINT64 LockOwner;
+} VIRTIO_FS_FUSE_FLUSH_REQUEST;
+
//
// Headers for VirtioFsFuseOpInit.
//
typedef struct {
UINT32 Major;
UINT32 Minor;
UINT32 MaxReadahead;
UINT32 Flags;
diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf
index 839660a0f904..15e21772c8ac 100644
--- a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf
+++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf
@@ -77,16 +77,17 @@ [Defines]
ENTRY_POINT = VirtioFsEntryPoint
[Packages]
MdePkg/MdePkg.dec
OvmfPkg/OvmfPkg.dec
[Sources]
DriverBinding.c
+ FuseFlush.c
FuseForget.c
FuseFsync.c
FuseInit.c
FuseOpenDir.c
FuseRelease.c
Helpers.c
SimpleFsClose.c
SimpleFsDelete.c
diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h
index ac1fb8965472..7151a62bb42b 100644
--- a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h
+++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h
@@ -212,16 +212,23 @@ VirtioFsFuseReleaseFileOrDir (
EFI_STATUS
VirtioFsFuseFsyncFileOrDir (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
IN UINT64 FuseHandle,
IN BOOLEAN IsDir
);
+EFI_STATUS
+VirtioFsFuseFlush (
+ IN OUT VIRTIO_FS *VirtioFs,
+ IN UINT64 NodeId,
+ IN UINT64 FuseHandle
+ );
+
EFI_STATUS
VirtioFsFuseInitSession (
IN OUT VIRTIO_FS *VirtioFs
);
EFI_STATUS
VirtioFsFuseOpenDir (
IN OUT VIRTIO_FS *VirtioFs,
diff --git a/OvmfPkg/VirtioFsDxe/FuseFlush.c b/OvmfPkg/VirtioFsDxe/FuseFlush.c
new file mode 100644
index 000000000000..b689ad32910a
--- /dev/null
+++ b/OvmfPkg/VirtioFsDxe/FuseFlush.c
@@ -0,0 +1,111 @@
+/** @file
+ FUSE_FLUSH wrapper for the Virtio Filesystem device.
+
+ Copyright (C) 2020, Red Hat, Inc.
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include "VirtioFsDxe.h"
+
+/**
+ Flush changes queued on the local virtualization host to the remote storage
+ server's memory (not storage device), over the network, by sending the
+ FUSE_FLUSH request to the Virtio Filesystem device.
+
+ 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_FLUSH
+ request to. On output, the FUSE request counter
+ "VirtioFs->RequestId" will have been incremented.
+
+ @param[in] NodeId The inode number of the regular file to flush.
+
+ @param[in] FuseHandle The open handle to the regular file to flush.
+
+ @retval EFI_SUCCESS The regular file has been flushed.
+
+ @return The "errno" value mapped to an EFI_STATUS code, if the
+ Virtio Filesystem device explicitly reported an error.
+
+ @return Error codes propagated from VirtioFsSgListsValidate(),
+ VirtioFsFuseNewRequest(), VirtioFsSgListsSubmit(),
+ VirtioFsFuseCheckResponse().
+**/
+EFI_STATUS
+VirtioFsFuseFlush (
+ IN OUT VIRTIO_FS *VirtioFs,
+ IN UINT64 NodeId,
+ IN UINT64 FuseHandle
+ )
+{
+ VIRTIO_FS_FUSE_REQUEST CommonReq;
+ VIRTIO_FS_FUSE_FLUSH_REQUEST FlushReq;
+ VIRTIO_FS_IO_VECTOR ReqIoVec[2];
+ VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
+ VIRTIO_FS_FUSE_RESPONSE CommonResp;
+ VIRTIO_FS_IO_VECTOR RespIoVec[1];
+ VIRTIO_FS_SCATTER_GATHER_LIST RespSgList;
+ EFI_STATUS Status;
+
+ //
+ // Set up the scatter-gather lists.
+ //
+ ReqIoVec[0].Buffer = &CommonReq;
+ ReqIoVec[0].Size = sizeof CommonReq;
+ ReqIoVec[1].Buffer = &FlushReq;
+ ReqIoVec[1].Size = sizeof FlushReq;
+ ReqSgList.IoVec = ReqIoVec;
+ ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
+
+ RespIoVec[0].Buffer = &CommonResp;
+ RespIoVec[0].Size = sizeof CommonResp;
+ RespSgList.IoVec = RespIoVec;
+ RespSgList.NumVec = ARRAY_SIZE (RespIoVec);
+
+ //
+ // Validate the scatter-gather lists; calculate the total transfer sizes.
+ //
+ Status = VirtioFsSgListsValidate (VirtioFs, &ReqSgList, &RespSgList);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ //
+ // Populate the common request header.
+ //
+ Status = VirtioFsFuseNewRequest (VirtioFs, &CommonReq, ReqSgList.TotalSize,
+ VirtioFsFuseOpFlush, NodeId);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ //
+ // Populate the FUSE_FLUSH-specific fields.
+ //
+ FlushReq.FileHandle = FuseHandle;
+ FlushReq.Unused = 0;
+ FlushReq.Padding = 0;
+ FlushReq.LockOwner = 0;
+
+ //
+ // Submit the request.
+ //
+ Status = VirtioFsSgListsSubmit (VirtioFs, &ReqSgList, &RespSgList);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ //
+ // Verify the response (all response buffers are fixed size).
+ //
+ Status = VirtioFsFuseCheckResponse (&RespSgList, CommonReq.Unique, NULL);
+ if (Status == EFI_DEVICE_ERROR) {
+ DEBUG ((DEBUG_ERROR, "%a: Label=\"%s\" NodeId=%Lu FuseHandle=%Lu "
+ "Errno=%d\n", __FUNCTION__, VirtioFs->Label, NodeId, FuseHandle,
+ CommonResp.Error));
+ Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);
+ }
+ return Status;
+}
--
2.19.1.3.g30247aa5d201
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