From a70860f4499571669f3795adf52ccb0fa02cdac1 Mon Sep 17 00:00:00 2001 From: Laszlo Ersek Date: Wed, 16 Dec 2020 22:10:57 +0100 Subject: OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_CREATE MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add the VirtioFsFuseOpenOrCreate() function, for sending the FUSE_CREATE command to the Virtio Filesystem device. Cc: Ard Biesheuvel Cc: Jordan Justen Cc: Philippe Mathieu-Daudé Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097 Signed-off-by: Laszlo Ersek Message-Id: <20201216211125.19496-21-lersek@redhat.com> Acked-by: Ard Biesheuvel --- OvmfPkg/VirtioFsDxe/FuseOpenOrCreate.c | 155 +++++++++++++++++++++++++++++++++ 1 file changed, 155 insertions(+) create mode 100644 OvmfPkg/VirtioFsDxe/FuseOpenOrCreate.c (limited to 'OvmfPkg/VirtioFsDxe/FuseOpenOrCreate.c') diff --git a/OvmfPkg/VirtioFsDxe/FuseOpenOrCreate.c b/OvmfPkg/VirtioFsDxe/FuseOpenOrCreate.c new file mode 100644 index 0000000000..60ab002bcd --- /dev/null +++ b/OvmfPkg/VirtioFsDxe/FuseOpenOrCreate.c @@ -0,0 +1,155 @@ +/** @file + FUSE_CREATE wrapper for the Virtio Filesystem device. + + Copyright (C) 2020, Red Hat, Inc. + + SPDX-License-Identifier: BSD-2-Clause-Patent +**/ + +#include // AsciiStrSize() + +#include "VirtioFsDxe.h" + +/** + Send a FUSE_CREATE request to the Virtio Filesystem device, for opening a + regular file with (O_RDWR | O_CREAT) semantics. + + 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_CREATE + request to. On output, the FUSE request counter + "VirtioFs->RequestId" will have been incremented. + + @param[in] ParentNodeId The inode number of the direct parent directory of + the regular file to open or create. + + @param[in] Name The single-component filename of the regular file to + open or create, under the parent directory + identified by ParentNodeId. + + @param[out] NodeId The inode number of the regular file, returned by + the Virtio Filesystem device. + + @param[out] FuseHandle The open file handle returned by the Virtio + Filesystem device. + + @retval EFI_SUCCESS The regular file has been opened, and (if necessary) + created. + + @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 +VirtioFsFuseOpenOrCreate ( + IN OUT VIRTIO_FS *VirtioFs, + IN UINT64 ParentNodeId, + IN CHAR8 *Name, + OUT UINT64 *NodeId, + OUT UINT64 *FuseHandle + ) +{ + VIRTIO_FS_FUSE_REQUEST CommonReq; + VIRTIO_FS_FUSE_CREATE_REQUEST CreateReq; + VIRTIO_FS_IO_VECTOR ReqIoVec[3]; + VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList; + VIRTIO_FS_FUSE_RESPONSE CommonResp; + VIRTIO_FS_FUSE_NODE_RESPONSE NodeResp; + VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE AttrResp; + VIRTIO_FS_FUSE_OPEN_RESPONSE OpenResp; + VIRTIO_FS_IO_VECTOR RespIoVec[4]; + 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 = &CreateReq; + ReqIoVec[1].Size = sizeof CreateReq; + ReqIoVec[2].Buffer = Name; + ReqIoVec[2].Size = AsciiStrSize (Name); + ReqSgList.IoVec = ReqIoVec; + ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec); + + RespIoVec[0].Buffer = &CommonResp; + RespIoVec[0].Size = sizeof CommonResp; + RespIoVec[1].Buffer = &NodeResp; + RespIoVec[1].Size = sizeof NodeResp; + RespIoVec[2].Buffer = &AttrResp; + RespIoVec[2].Size = sizeof AttrResp; + RespIoVec[3].Buffer = &OpenResp; + RespIoVec[3].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, + VirtioFsFuseOpCreate, ParentNodeId); + if (EFI_ERROR (Status)) { + return Status; + } + + // + // Populate the FUSE_CREATE-specific fields. + // + // VIRTIO_FS_FUSE_OPEN_REQ_F_RDWR is why this request can never open a + // directory (EISDIR). And VIRTIO_FS_FUSE_OPEN_REQ_F_RDWR is consistent with + // the only OpenMode of EFI_FILE_PROTOCOL.Open() that enables filesystem + // object creation -- that is, Create/Read/Write. + // + CreateReq.Flags = VIRTIO_FS_FUSE_OPEN_REQ_F_RDWR; + CreateReq.Mode = (VIRTIO_FS_FUSE_MODE_PERM_RUSR | + VIRTIO_FS_FUSE_MODE_PERM_WUSR | + VIRTIO_FS_FUSE_MODE_PERM_RGRP | + VIRTIO_FS_FUSE_MODE_PERM_WGRP | + VIRTIO_FS_FUSE_MODE_PERM_ROTH | + VIRTIO_FS_FUSE_MODE_PERM_WOTH); + CreateReq.Umask = 0; + CreateReq.Padding = 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\" ParentNodeId=%Lu Name=\"%a\" " + "Errno=%d\n", __FUNCTION__, VirtioFs->Label, ParentNodeId, Name, + CommonResp.Error)); + Status = VirtioFsErrnoToEfiStatus (CommonResp.Error); + } + return Status; + } + + // + // Output the NodeId of the (possibly new) regular file. Also output the open + // file handle. + // + *NodeId = NodeResp.NodeId; + *FuseHandle = OpenResp.FileHandle; + return EFI_SUCCESS; +} -- cgit v1.2.3