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| author | Laszlo Ersek <lersek@redhat.com> | 2020-12-16 22:10:49 +0100 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2020-12-21 17:16:23 +0000 |
| commit | 92a4d30e0449da2940ff24d159d687afc6672e9c (patch) | |
| tree | 7efb7039b1e819b21098b219ad21f5f0e1190db0 /OvmfPkg/VirtioFsDxe | |
| parent | 334c13e106ebad35a8e620f3b0f1179a1a6eaa54 (diff) | |
| download | edk2-92a4d30e0449da2940ff24d159d687afc6672e9c.tar.gz edk2-92a4d30e0449da2940ff24d159d687afc6672e9c.tar.bz2 edk2-92a4d30e0449da2940ff24d159d687afc6672e9c.zip | |
OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_FORGET
Add the VirtioFsFuseForget() function, for sending the FUSE_FORGET command
to the Virtio Filesystem device.
This is an unusual command in that it doesn't generate any response from
the FUSE server.
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20201216211125.19496-13-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Diffstat (limited to 'OvmfPkg/VirtioFsDxe')
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/FuseForget.c | 85 | ||||
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/VirtioFsDxe.h | 6 | ||||
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf | 1 |
3 files changed, 92 insertions, 0 deletions
diff --git a/OvmfPkg/VirtioFsDxe/FuseForget.c b/OvmfPkg/VirtioFsDxe/FuseForget.c new file mode 100644 index 0000000000..fdee42cffb --- /dev/null +++ b/OvmfPkg/VirtioFsDxe/FuseForget.c @@ -0,0 +1,85 @@ +/** @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;
+}
diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h index 34574d0596..68ed6cd7e6 100644 --- a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h +++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h @@ -196,6 +196,12 @@ VirtioFsErrnoToEfiStatus ( //
EFI_STATUS
+VirtioFsFuseForget (
+ IN OUT VIRTIO_FS *VirtioFs,
+ IN UINT64 NodeId
+ );
+
+EFI_STATUS
VirtioFsFuseReleaseFileOrDir (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
diff --git a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf index 28e66082ec..baeb741be1 100644 --- a/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf +++ b/OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf @@ -82,6 +82,7 @@ [Sources]
DriverBinding.c
+ FuseForget.c
FuseInit.c
FuseOpenDir.c
FuseRelease.c
|