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- /** @file
- FUSE_RENAME2 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"
- /**
- Rename a regular file or a directory, by sending the FUSE_RENAME2 request to
- the Virtio Filesystem device. If the new filename exists, the request will
- fail.
- 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_RENAME2 request to. On output, the FUSE
- request counter "VirtioFs->RequestId" will have
- been incremented.
- @param[in] OldParentNodeId The inode number of the directory in which
- OldName should be removed.
- @param[in] OldName The single-component filename to remove in the
- directory identified by OldParentNodeId.
- @param[in] NewParentNodeId The inode number of the directory in which
- NewName should be created, such that on
- successful return, (NewParentNodeId, NewName)
- refer to the same inode as (OldParentNodeId,
- OldName) did on entry.
- @param[in] NewName The single-component filename to create in the
- directory identified by NewParentNodeId.
- @retval EFI_SUCCESS The file or directory has been renamed.
- @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
- VirtioFsFuseRename (
- IN OUT VIRTIO_FS *VirtioFs,
- IN UINT64 OldParentNodeId,
- IN CHAR8 *OldName,
- IN UINT64 NewParentNodeId,
- IN CHAR8 *NewName
- )
- {
- VIRTIO_FS_FUSE_REQUEST CommonReq;
- VIRTIO_FS_FUSE_RENAME2_REQUEST Rename2Req;
- VIRTIO_FS_IO_VECTOR ReqIoVec[4];
- 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 = &Rename2Req;
- ReqIoVec[1].Size = sizeof Rename2Req;
- ReqIoVec[2].Buffer = OldName;
- ReqIoVec[2].Size = AsciiStrSize (OldName);
- ReqIoVec[3].Buffer = NewName;
- ReqIoVec[3].Size = AsciiStrSize (NewName);
- 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,
- VirtioFsFuseOpRename2,
- OldParentNodeId
- );
- if (EFI_ERROR (Status)) {
- return Status;
- }
- //
- // Populate the FUSE_RENAME2-specific fields.
- //
- Rename2Req.NewDir = NewParentNodeId;
- Rename2Req.Flags = VIRTIO_FS_FUSE_RENAME2_REQ_F_NOREPLACE;
- Rename2Req.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 (Status == EFI_DEVICE_ERROR) {
- DEBUG ((
- DEBUG_ERROR,
- "%a: Label=\"%s\" OldParentNodeId=%Lu OldName=\"%a\" "
- "NewParentNodeId=%Lu NewName=\"%a\" Errno=%d\n",
- __FUNCTION__,
- VirtioFs->Label,
- OldParentNodeId,
- OldName,
- NewParentNodeId,
- NewName,
- CommonResp.Error
- ));
- Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);
- }
- return Status;
- }
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