diff options
| author | Laszlo Ersek <lersek@redhat.com> | 2020-12-16 22:11:01 +0100 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2020-12-21 17:16:23 +0000 |
| commit | 0771671c4b873c9de4e27144ddce67e1bb8988da (patch) | |
| tree | 6c812c33816843e98886227f649cbd8a78d49884 /OvmfPkg/VirtioFsDxe/FuseUnlink.c | |
| parent | ca61b84586d59bdda1837ba00eb6e24fa900dc56 (diff) | |
| download | edk2-0771671c4b873c9de4e27144ddce67e1bb8988da.tar.gz edk2-0771671c4b873c9de4e27144ddce67e1bb8988da.tar.bz2 edk2-0771671c4b873c9de4e27144ddce67e1bb8988da.zip | |
OvmfPkg/VirtioFsDxe: add a shared wrapper for FUSE_UNLINK / FUSE_RMDIR
The FUSE_UNLINK and FUSE_RMDIR commands only differ in the opcode. Add a
common function for wrapping both.
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: <20201216211125.19496-25-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Diffstat (limited to 'OvmfPkg/VirtioFsDxe/FuseUnlink.c')
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/FuseUnlink.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/OvmfPkg/VirtioFsDxe/FuseUnlink.c b/OvmfPkg/VirtioFsDxe/FuseUnlink.c new file mode 100644 index 0000000000..8f84edbe94 --- /dev/null +++ b/OvmfPkg/VirtioFsDxe/FuseUnlink.c @@ -0,0 +1,114 @@ +/** @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;
+}
|