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124 lines
3.7 KiB
C
124 lines
3.7 KiB
C
/** @file
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FUSE_UNLINK / FUSE_RMDIR wrapper for the Virtio Filesystem device.
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Copyright (C) 2020, Red Hat, Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/BaseLib.h> // AsciiStrSize()
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#include "VirtioFsDxe.h"
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/**
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Remove a regular file or a directory, by sending the FUSE_UNLINK or
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FUSE_RMDIR request to the Virtio Filesystem device.
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The function may only be called after VirtioFsFuseInitSession() returns
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successfully and before VirtioFsUninit() is called.
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@param[in,out] VirtioFs The Virtio Filesystem device to send the FUSE_UNLINK
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/ FUSE_RMDIR request to. On output, the FUSE request
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counter "VirtioFs->RequestId" will have been
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incremented.
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@param[in] ParentNodeId The inode number of the directory in which Name
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should be removed.
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@param[in] Name The single-component filename to remove in the
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directory identified by ParentNodeId.
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@param[in] IsDir TRUE if Name refers to a directory, FALSE otherwise.
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@retval EFI_SUCCESS The file or directory has been removed.
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@return The "errno" value mapped to an EFI_STATUS code, if the
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Virtio Filesystem device explicitly reported an error.
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@return Error codes propagated from VirtioFsSgListsValidate(),
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VirtioFsFuseNewRequest(), VirtioFsSgListsSubmit(),
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VirtioFsFuseCheckResponse().
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**/
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EFI_STATUS
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VirtioFsFuseRemoveFileOrDir (
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IN OUT VIRTIO_FS *VirtioFs,
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IN UINT64 ParentNodeId,
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IN CHAR8 *Name,
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IN BOOLEAN IsDir
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)
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{
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VIRTIO_FS_FUSE_REQUEST CommonReq;
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VIRTIO_FS_IO_VECTOR ReqIoVec[2];
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VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
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VIRTIO_FS_FUSE_RESPONSE CommonResp;
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VIRTIO_FS_IO_VECTOR RespIoVec[1];
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VIRTIO_FS_SCATTER_GATHER_LIST RespSgList;
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EFI_STATUS Status;
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//
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// Set up the scatter-gather lists.
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//
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ReqIoVec[0].Buffer = &CommonReq;
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ReqIoVec[0].Size = sizeof CommonReq;
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ReqIoVec[1].Buffer = Name;
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ReqIoVec[1].Size = AsciiStrSize (Name);
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ReqSgList.IoVec = ReqIoVec;
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ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
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RespIoVec[0].Buffer = &CommonResp;
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RespIoVec[0].Size = sizeof CommonResp;
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RespSgList.IoVec = RespIoVec;
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RespSgList.NumVec = ARRAY_SIZE (RespIoVec);
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//
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// Validate the scatter-gather lists; calculate the total transfer sizes.
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//
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Status = VirtioFsSgListsValidate (VirtioFs, &ReqSgList, &RespSgList);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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//
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// Populate the common request header.
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//
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Status = VirtioFsFuseNewRequest (
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VirtioFs,
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&CommonReq,
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ReqSgList.TotalSize,
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IsDir ? VirtioFsFuseOpRmDir : VirtioFsFuseOpUnlink,
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ParentNodeId
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);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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//
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// Submit the request.
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//
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Status = VirtioFsSgListsSubmit (VirtioFs, &ReqSgList, &RespSgList);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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//
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// Verify the response (all response buffers are fixed size).
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//
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Status = VirtioFsFuseCheckResponse (&RespSgList, CommonReq.Unique, NULL);
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if (Status == EFI_DEVICE_ERROR) {
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DEBUG ((
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DEBUG_ERROR,
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"%a: Label=\"%s\" ParentNodeId=%Lu Name=\"%a\" "
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"IsDir=%d Errno=%d\n",
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__func__,
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VirtioFs->Label,
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ParentNodeId,
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Name,
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IsDir,
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CommonResp.Error
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));
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Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);
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}
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return Status;
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}
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