diff options
Diffstat (limited to 'OvmfPkg')
| -rw-r--r-- | OvmfPkg/Include/IndustryStandard/VirtioFs.h | 35 | ||||
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/FuseOpen.c | 126 | ||||
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/VirtioFsDxe.h | 8 | ||||
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf | 1 |
4 files changed, 156 insertions, 14 deletions
diff --git a/OvmfPkg/Include/IndustryStandard/VirtioFs.h b/OvmfPkg/Include/IndustryStandard/VirtioFs.h index fec2f4be53..7b6f303355 100644 --- a/OvmfPkg/Include/IndustryStandard/VirtioFs.h +++ b/OvmfPkg/Include/IndustryStandard/VirtioFs.h @@ -82,10 +82,17 @@ typedef struct { #define VIRTIO_FS_FUSE_ROOT_DIR_NODE_ID 1
//
+// Flags for VirtioFsFuseOpOpen.
+//
+#define VIRTIO_FS_FUSE_OPEN_REQ_F_RDONLY 0
+#define VIRTIO_FS_FUSE_OPEN_REQ_F_RDWR 2
+
+//
// FUSE operation codes.
//
typedef enum {
VirtioFsFuseOpForget = 2,
+ VirtioFsFuseOpOpen = 14,
VirtioFsFuseOpRelease = 18,
VirtioFsFuseOpFsync = 20,
VirtioFsFuseOpFlush = 25,
@@ -124,6 +131,20 @@ typedef struct { } VIRTIO_FS_FUSE_FORGET_REQUEST;
//
+// Headers for VirtioFsFuseOpOpen and VirtioFsFuseOpOpenDir.
+//
+typedef struct {
+ UINT32 Flags;
+ UINT32 Unused;
+} VIRTIO_FS_FUSE_OPEN_REQUEST;
+
+typedef struct {
+ UINT64 FileHandle;
+ UINT32 OpenFlags;
+ UINT32 Padding;
+} VIRTIO_FS_FUSE_OPEN_RESPONSE;
+
+//
// Header for VirtioFsFuseOpRelease and VirtioFsFuseOpReleaseDir.
//
typedef struct {
@@ -175,20 +196,6 @@ typedef struct { UINT16 MapAlignment;
UINT32 Unused[8];
} VIRTIO_FS_FUSE_INIT_RESPONSE;
-
-//
-// Headers for VirtioFsFuseOpOpenDir.
-//
-typedef struct {
- UINT32 Flags;
- UINT32 Unused;
-} VIRTIO_FS_FUSE_OPEN_REQUEST;
-
-typedef struct {
- UINT64 FileHandle;
- UINT32 OpenFlags;
- UINT32 Padding;
-} VIRTIO_FS_FUSE_OPEN_RESPONSE;
#pragma pack ()
#endif // VIRTIO_FS_H_
diff --git a/OvmfPkg/VirtioFsDxe/FuseOpen.c b/OvmfPkg/VirtioFsDxe/FuseOpen.c new file mode 100644 index 0000000000..b731580729 --- /dev/null +++ b/OvmfPkg/VirtioFsDxe/FuseOpen.c @@ -0,0 +1,126 @@ +/** @file
+ FUSE_OPEN wrapper for the Virtio Filesystem device.
+
+ Copyright (C) 2020, Red Hat, Inc.
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include "VirtioFsDxe.h"
+
+/**
+ Send a FUSE_OPEN request to the Virtio Filesystem device, for opening a
+ regular file.
+
+ 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_OPEN
+ 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 open.
+
+ @param[in] ReadWrite If TRUE, open the regular file in read-write mode.
+ If FALSE, open the regular file in read-only mode.
+
+ @param[out] FuseHandle The open handle to the regular file, returned by the
+ Virtio Filesystem device.
+
+ @retval EFI_SUCCESS The regular file has been opened.
+
+ @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
+VirtioFsFuseOpen (
+ IN OUT VIRTIO_FS *VirtioFs,
+ IN UINT64 NodeId,
+ IN BOOLEAN ReadWrite,
+ OUT UINT64 *FuseHandle
+ )
+{
+ VIRTIO_FS_FUSE_REQUEST CommonReq;
+ VIRTIO_FS_FUSE_OPEN_REQUEST OpenReq;
+ VIRTIO_FS_IO_VECTOR ReqIoVec[2];
+ VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
+ VIRTIO_FS_FUSE_RESPONSE CommonResp;
+ VIRTIO_FS_FUSE_OPEN_RESPONSE OpenResp;
+ VIRTIO_FS_IO_VECTOR RespIoVec[2];
+ 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 = &OpenReq;
+ ReqIoVec[1].Size = sizeof OpenReq;
+ ReqSgList.IoVec = ReqIoVec;
+ ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
+
+ RespIoVec[0].Buffer = &CommonResp;
+ RespIoVec[0].Size = sizeof CommonResp;
+ RespIoVec[1].Buffer = &OpenResp;
+ RespIoVec[1].Size = sizeof OpenResp;
+ 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,
+ VirtioFsFuseOpOpen, NodeId);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ //
+ // Populate the FUSE_OPEN-specific fields.
+ //
+ OpenReq.Flags = (ReadWrite ?
+ VIRTIO_FS_FUSE_OPEN_REQ_F_RDWR :
+ VIRTIO_FS_FUSE_OPEN_REQ_F_RDONLY);
+ OpenReq.Unused = 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 (EFI_ERROR (Status)) {
+ if (Status == EFI_DEVICE_ERROR) {
+ DEBUG ((DEBUG_ERROR, "%a: Label=\"%s\" NodeId=%Lu ReadWrite=%d "
+ "Errno=%d\n", __FUNCTION__, VirtioFs->Label, NodeId, ReadWrite,
+ CommonResp.Error));
+ Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);
+ }
+ return Status;
+ }
+
+ //
+ // Output the open handle.
+ //
+ *FuseHandle = OpenResp.FileHandle;
+ return EFI_SUCCESS;
+}
diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h index 487d215c7f..c13258a2e0 100644 --- a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h +++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h @@ -236,6 +236,14 @@ VirtioFsFuseForget ( );
EFI_STATUS
+VirtioFsFuseOpen (
+ IN OUT VIRTIO_FS *VirtioFs,
+ IN UINT64 NodeId,
+ IN BOOLEAN ReadWrite,
+ OUT UINT64 *FuseHandle
+ );
+
+EFI_STATUS
VirtioFsFuseReleaseFileOrDir (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf index 0c92bccdac..dc9a12820f 100644 --- a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf +++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf @@ -86,6 +86,7 @@ FuseForget.c
FuseFsync.c
FuseInit.c
+ FuseOpen.c
FuseOpenDir.c
FuseRelease.c
Helpers.c
|