diff options
Diffstat (limited to 'OvmfPkg/VirtioFsDxe/FuseRename.c')
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/FuseRename.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/OvmfPkg/VirtioFsDxe/FuseRename.c b/OvmfPkg/VirtioFsDxe/FuseRename.c new file mode 100644 index 0000000000..fc9b27ccf6 --- /dev/null +++ b/OvmfPkg/VirtioFsDxe/FuseRename.c @@ -0,0 +1,131 @@ +/** @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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