146 lines
4.6 KiB
C
146 lines
4.6 KiB
C
/** @file
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FUSE_RENAME2 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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Rename a regular file or a directory, by sending the FUSE_RENAME2 request to
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the Virtio Filesystem device. If the new filename exists, the request will
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fail.
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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
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FUSE_RENAME2 request to. On output, the FUSE
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request counter "VirtioFs->RequestId" will have
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been incremented.
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@param[in] OldParentNodeId The inode number of the directory in which
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OldName should be removed.
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@param[in] OldName The single-component filename to remove in the
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directory identified by OldParentNodeId.
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@param[in] NewParentNodeId The inode number of the directory in which
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NewName should be created, such that on
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successful return, (NewParentNodeId, NewName)
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refer to the same inode as (OldParentNodeId,
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OldName) did on entry.
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@param[in] NewName The single-component filename to create in the
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directory identified by NewParentNodeId.
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@retval EFI_SUCCESS The file or directory has been renamed.
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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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VirtioFsFuseRename (
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IN OUT VIRTIO_FS *VirtioFs,
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IN UINT64 OldParentNodeId,
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IN CHAR8 *OldName,
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IN UINT64 NewParentNodeId,
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IN CHAR8 *NewName
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)
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{
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VIRTIO_FS_FUSE_REQUEST CommonReq;
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VIRTIO_FS_FUSE_RENAME2_REQUEST Rename2Req;
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VIRTIO_FS_IO_VECTOR ReqIoVec[4];
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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 = &Rename2Req;
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ReqIoVec[1].Size = sizeof Rename2Req;
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ReqIoVec[2].Buffer = OldName;
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ReqIoVec[2].Size = AsciiStrSize (OldName);
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ReqIoVec[3].Buffer = NewName;
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ReqIoVec[3].Size = AsciiStrSize (NewName);
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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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VirtioFsFuseOpRename2,
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OldParentNodeId
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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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// Populate the FUSE_RENAME2-specific fields.
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//
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Rename2Req.NewDir = NewParentNodeId;
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Rename2Req.Flags = VIRTIO_FS_FUSE_RENAME2_REQ_F_NOREPLACE;
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Rename2Req.Padding = 0;
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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\" OldParentNodeId=%Lu OldName=\"%a\" "
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"NewParentNodeId=%Lu NewName=\"%a\" Errno=%d\n",
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__func__,
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VirtioFs->Label,
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OldParentNodeId,
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OldName,
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NewParentNodeId,
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NewName,
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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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