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/** @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;
}
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