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| author | Laszlo Ersek <lersek@redhat.com> | 2020-12-16 22:10:55 +0100 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2020-12-21 17:16:23 +0000 |
| commit | da82d2e3a088ba4c8e5598611196c55534ddb630 (patch) | |
| tree | 410e4a4aba181b3b186181b02c4dc5f1cc595476 /OvmfPkg/VirtioFsDxe | |
| parent | 7e8c83f7d4823009d1f37ec6a0fa2c4ef888c2d5 (diff) | |
| download | edk2-da82d2e3a088ba4c8e5598611196c55534ddb630.tar.gz edk2-da82d2e3a088ba4c8e5598611196c55534ddb630.tar.bz2 edk2-da82d2e3a088ba4c8e5598611196c55534ddb630.zip | |
OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_OPEN
Add the VirtioFsFuseOpen() function, for sending the FUSE_OPEN command to
the Virtio Filesystem device.
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: <20201216211125.19496-19-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Diffstat (limited to 'OvmfPkg/VirtioFsDxe')
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/FuseOpen.c | 126 | ||||
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/VirtioFsDxe.h | 8 | ||||
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf | 1 |
3 files changed, 135 insertions, 0 deletions
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
|