| 1 | /** @file
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| 2 | EFI_SIMPLE_FILE_SYSTEM_PROTOCOL.OpenVolume() member function for the Virtio
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| 3 | Filesystem driver.
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| 4 |
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| 5 | Copyright (C) 2020, Red Hat, Inc.
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| 6 |
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| 7 | SPDX-License-Identifier: BSD-2-Clause-Patent
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| 8 | **/
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| 9 |
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| 10 | #include <Library/BaseLib.h> // InsertTailList()
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| 11 | #include <Library/MemoryAllocationLib.h> // AllocatePool()
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| 12 |
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| 13 | #include "VirtioFsDxe.h"
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| 14 |
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| 15 | /**
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| 16 | Open the root directory on the Virtio Filesystem.
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| 17 |
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| 18 | Refer to EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_OPEN_VOLUME for the interface
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| 19 | contract.
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| 20 | **/
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| 21 | EFI_STATUS
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| 22 | EFIAPI
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| 23 | VirtioFsOpenVolume (
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| 24 | IN EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *This,
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| 25 | OUT EFI_FILE_PROTOCOL **Root
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| 26 | )
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| 27 | {
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| 28 | VIRTIO_FS *VirtioFs;
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| 29 | VIRTIO_FS_FILE *VirtioFsFile;
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| 30 | EFI_STATUS Status;
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| 31 | CHAR8 *CanonicalPathname;
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| 32 | UINT64 RootDirHandle;
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| 33 |
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| 34 | VirtioFs = VIRTIO_FS_FROM_SIMPLE_FS (This);
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| 35 |
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| 36 | VirtioFsFile = AllocatePool (sizeof *VirtioFsFile);
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| 37 | if (VirtioFsFile == NULL) {
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| 38 | return EFI_OUT_OF_RESOURCES;
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| 39 | }
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| 40 |
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| 41 | CanonicalPathname = AllocateCopyPool (sizeof "/", "/");
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| 42 | if (CanonicalPathname == NULL) {
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| 43 | Status = EFI_OUT_OF_RESOURCES;
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| 44 | goto FreeVirtioFsFile;
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| 45 | }
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| 46 |
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| 47 | //
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| 48 | // Open the root directory.
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| 49 | //
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| 50 | Status = VirtioFsFuseOpenDir (VirtioFs, VIRTIO_FS_FUSE_ROOT_DIR_NODE_ID,
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| 51 | &RootDirHandle);
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| 52 | if (EFI_ERROR (Status)) {
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| 53 | goto FreeCanonicalPathname;
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| 54 | }
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| 55 |
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| 56 | //
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| 57 | // Populate the new VIRTIO_FS_FILE object.
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| 58 | //
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| 59 | VirtioFsFile->Signature = VIRTIO_FS_FILE_SIG;
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| 60 | VirtioFsFile->SimpleFile.Revision = EFI_FILE_PROTOCOL_REVISION;
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| 61 | VirtioFsFile->SimpleFile.Open = VirtioFsSimpleFileOpen;
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| 62 | VirtioFsFile->SimpleFile.Close = VirtioFsSimpleFileClose;
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| 63 | VirtioFsFile->SimpleFile.Delete = VirtioFsSimpleFileDelete;
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| 64 | VirtioFsFile->SimpleFile.Read = VirtioFsSimpleFileRead;
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| 65 | VirtioFsFile->SimpleFile.Write = VirtioFsSimpleFileWrite;
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| 66 | VirtioFsFile->SimpleFile.GetPosition = VirtioFsSimpleFileGetPosition;
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| 67 | VirtioFsFile->SimpleFile.SetPosition = VirtioFsSimpleFileSetPosition;
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| 68 | VirtioFsFile->SimpleFile.GetInfo = VirtioFsSimpleFileGetInfo;
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| 69 | VirtioFsFile->SimpleFile.SetInfo = VirtioFsSimpleFileSetInfo;
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| 70 | VirtioFsFile->SimpleFile.Flush = VirtioFsSimpleFileFlush;
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| 71 | VirtioFsFile->IsDirectory = TRUE;
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| 72 | VirtioFsFile->IsOpenForWriting = FALSE;
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| 73 | VirtioFsFile->OwnerFs = VirtioFs;
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| 74 | VirtioFsFile->CanonicalPathname = CanonicalPathname;
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| 75 | VirtioFsFile->FilePosition = 0;
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| 76 | VirtioFsFile->NodeId = VIRTIO_FS_FUSE_ROOT_DIR_NODE_ID;
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| 77 | VirtioFsFile->FuseHandle = RootDirHandle;
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| 78 | VirtioFsFile->FileInfoArray = NULL;
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| 79 | VirtioFsFile->SingleFileInfoSize = 0;
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| 80 | VirtioFsFile->NumFileInfo = 0;
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| 81 | VirtioFsFile->NextFileInfo = 0;
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| 82 |
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| 83 | //
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| 84 | // One more file open for the filesystem.
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| 85 | //
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| 86 | InsertTailList (&VirtioFs->OpenFiles, &VirtioFsFile->OpenFilesEntry);
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| 87 |
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| 88 | *Root = &VirtioFsFile->SimpleFile;
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| 89 | return EFI_SUCCESS;
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| 90 |
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| 91 | FreeCanonicalPathname:
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| 92 | FreePool (CanonicalPathname);
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| 93 |
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| 94 | FreeVirtioFsFile:
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| 95 | FreePool (VirtioFsFile);
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| 96 |
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| 97 | return Status;
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| 98 | }
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