mirror of https://github.com/acidanthera/audk.git
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/** @file
|
|
FUSE_FORGET wrapper for the Virtio Filesystem device.
|
|
|
|
Copyright (C) 2020, Red Hat, Inc.
|
|
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
**/
|
|
|
|
#include "VirtioFsDxe.h"
|
|
|
|
/**
|
|
Make the Virtio Filesysem device drop one reference count from a NodeId that
|
|
the driver looked up by filename.
|
|
|
|
Send the FUSE_FORGET request to the Virtio Filesysem device for this. Unlike
|
|
most other FUSE requests, FUSE_FORGET doesn't elicit a response, not even the
|
|
common VIRTIO_FS_FUSE_RESPONSE header.
|
|
|
|
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_FORGET
|
|
request to. On output, the FUSE request counter
|
|
"VirtioFs->RequestId" will have been incremented.
|
|
|
|
@param[in] NodeId The inode number that the client learned by way of
|
|
lookup, and that the server should now un-reference
|
|
exactly once.
|
|
|
|
@retval EFI_SUCCESS The FUSE_FORGET request has been submitted.
|
|
|
|
@return Error codes propagated from VirtioFsSgListsValidate(),
|
|
VirtioFsFuseNewRequest(), VirtioFsSgListsSubmit().
|
|
**/
|
|
EFI_STATUS
|
|
VirtioFsFuseForget (
|
|
IN OUT VIRTIO_FS *VirtioFs,
|
|
IN UINT64 NodeId
|
|
)
|
|
{
|
|
VIRTIO_FS_FUSE_REQUEST CommonReq;
|
|
VIRTIO_FS_FUSE_FORGET_REQUEST ForgetReq;
|
|
VIRTIO_FS_IO_VECTOR ReqIoVec[2];
|
|
VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
|
|
EFI_STATUS Status;
|
|
|
|
//
|
|
// Set up the scatter-gather list (note: only request).
|
|
//
|
|
ReqIoVec[0].Buffer = &CommonReq;
|
|
ReqIoVec[0].Size = sizeof CommonReq;
|
|
ReqIoVec[1].Buffer = &ForgetReq;
|
|
ReqIoVec[1].Size = sizeof ForgetReq;
|
|
ReqSgList.IoVec = ReqIoVec;
|
|
ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
|
|
|
|
//
|
|
// Validate the scatter-gather list (request only); calculate the total
|
|
// transfer size.
|
|
//
|
|
Status = VirtioFsSgListsValidate (VirtioFs, &ReqSgList, NULL);
|
|
if (EFI_ERROR (Status)) {
|
|
return Status;
|
|
}
|
|
|
|
//
|
|
// Populate the common request header.
|
|
//
|
|
Status = VirtioFsFuseNewRequest (VirtioFs, &CommonReq, ReqSgList.TotalSize,
|
|
VirtioFsFuseOpForget, NodeId);
|
|
if (EFI_ERROR (Status)) {
|
|
return Status;
|
|
}
|
|
|
|
//
|
|
// Populate the FUSE_FORGET-specific fields.
|
|
//
|
|
ForgetReq.NumberOfLookups = 1;
|
|
|
|
//
|
|
// Submit the request. There's not going to be a response.
|
|
//
|
|
Status = VirtioFsSgListsSubmit (VirtioFs, &ReqSgList, NULL);
|
|
return Status;
|
|
}
|