diff options
Diffstat (limited to 'src/VBox/Devices/EFI/Firmware/OvmfPkg/VirtioFsDxe/FuseUnlink.c')
-rw-r--r-- | src/VBox/Devices/EFI/Firmware/OvmfPkg/VirtioFsDxe/FuseUnlink.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/OvmfPkg/VirtioFsDxe/FuseUnlink.c b/src/VBox/Devices/EFI/Firmware/OvmfPkg/VirtioFsDxe/FuseUnlink.c new file mode 100644 index 00000000..b51349e7 --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/OvmfPkg/VirtioFsDxe/FuseUnlink.c @@ -0,0 +1,114 @@ +/** @file + FUSE_UNLINK / FUSE_RMDIR wrapper for the Virtio Filesystem device. + + Copyright (C) 2020, Red Hat, Inc. + + SPDX-License-Identifier: BSD-2-Clause-Patent +**/ + +#include <Library/BaseLib.h> // AsciiStrSize() + +#include "VirtioFsDxe.h" + +/** + Remove a regular file or a directory, by sending the FUSE_UNLINK or + FUSE_RMDIR 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_UNLINK + / FUSE_RMDIR request to. On output, the FUSE request + counter "VirtioFs->RequestId" will have been + incremented. + + @param[in] ParentNodeId The inode number of the directory in which Name + should be removed. + + @param[in] Name The single-component filename to remove in the + directory identified by ParentNodeId. + + @param[in] IsDir TRUE if Name refers to a directory, FALSE otherwise. + + @retval EFI_SUCCESS The file or directory has been removed. + + @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 +VirtioFsFuseRemoveFileOrDir ( + IN OUT VIRTIO_FS *VirtioFs, + IN UINT64 ParentNodeId, + IN CHAR8 *Name, + IN BOOLEAN IsDir + ) +{ + VIRTIO_FS_FUSE_REQUEST CommonReq; + 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 = Name; + ReqIoVec[1].Size = AsciiStrSize (Name); + 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, + IsDir ? VirtioFsFuseOpRmDir : VirtioFsFuseOpUnlink, + ParentNodeId + ); + if (EFI_ERROR (Status)) { + return Status; + } + + // + // 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\" ParentNodeId=%Lu Name=\"%a\" " + "IsDir=%d Errno=%d\n", __FUNCTION__, VirtioFs->Label, ParentNodeId, Name, + IsDir, CommonResp.Error)); + Status = VirtioFsErrnoToEfiStatus (CommonResp.Error); + } + return Status; +} |