diff options
Diffstat (limited to 'OvmfPkg/VirtioFsDxe/FuseMkDir.c')
| -rw-r--r-- | OvmfPkg/VirtioFsDxe/FuseMkDir.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/OvmfPkg/VirtioFsDxe/FuseMkDir.c b/OvmfPkg/VirtioFsDxe/FuseMkDir.c new file mode 100644 index 0000000000..541ff330cd --- /dev/null +++ b/OvmfPkg/VirtioFsDxe/FuseMkDir.c @@ -0,0 +1,134 @@ +/** @file
+ FUSE_MKDIR 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"
+
+/**
+ Send a FUSE_MKDIR request to the Virtio Filesystem device, for creating a
+ directory.
+
+ 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_MKDIR
+ request to. On output, the FUSE request counter
+ "VirtioFs->RequestId" will have been incremented.
+
+ @param[in] ParentNodeId The inode number of the direct parent directory of
+ the directory to create.
+
+ @param[in] Name The single-component filename of the directory to
+ create, under the parent directory identified by
+ ParentNodeId.
+
+ @param[out] NodeId The inode number of the new directory.
+
+ @retval EFI_SUCCESS The directory has been created.
+
+ @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
+VirtioFsFuseMkDir (
+ IN OUT VIRTIO_FS *VirtioFs,
+ IN UINT64 ParentNodeId,
+ IN CHAR8 *Name,
+ OUT UINT64 *NodeId
+ )
+{
+ VIRTIO_FS_FUSE_REQUEST CommonReq;
+ VIRTIO_FS_FUSE_MKDIR_REQUEST MkDirReq;
+ VIRTIO_FS_IO_VECTOR ReqIoVec[3];
+ VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
+ VIRTIO_FS_FUSE_RESPONSE CommonResp;
+ VIRTIO_FS_FUSE_NODE_RESPONSE NodeResp;
+ VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE AttrResp;
+ VIRTIO_FS_IO_VECTOR RespIoVec[3];
+ 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 = &MkDirReq;
+ ReqIoVec[1].Size = sizeof MkDirReq;
+ ReqIoVec[2].Buffer = Name;
+ ReqIoVec[2].Size = AsciiStrSize (Name);
+ ReqSgList.IoVec = ReqIoVec;
+ ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
+
+ RespIoVec[0].Buffer = &CommonResp;
+ RespIoVec[0].Size = sizeof CommonResp;
+ RespIoVec[1].Buffer = &NodeResp;
+ RespIoVec[1].Size = sizeof NodeResp;
+ RespIoVec[2].Buffer = &AttrResp;
+ RespIoVec[2].Size = sizeof AttrResp;
+ 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,
+ VirtioFsFuseOpMkDir, ParentNodeId);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ //
+ // Populate the FUSE_MKDIR-specific fields.
+ //
+ MkDirReq.Mode = (VIRTIO_FS_FUSE_MODE_PERM_RWXU |
+ VIRTIO_FS_FUSE_MODE_PERM_RWXG |
+ VIRTIO_FS_FUSE_MODE_PERM_RWXO);
+ MkDirReq.Umask = 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 (EFI_ERROR (Status)) {
+ if (Status == EFI_DEVICE_ERROR) {
+ DEBUG ((DEBUG_ERROR, "%a: Label=\"%s\" ParentNodeId=%Lu Name=\"%a\" "
+ "Errno=%d\n", __FUNCTION__, VirtioFs->Label, ParentNodeId, Name,
+ CommonResp.Error));
+ Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);
+ }
+ return Status;
+ }
+
+ //
+ // Output the NodeId of the new directory.
+ //
+ *NodeId = NodeResp.NodeId;
+ return EFI_SUCCESS;
+}
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