/** @file
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Driver entry point
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Copyright (c) 2021 Pedro Falcato All rights reserved.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "Ext4Dxe.h"
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/**
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Opens an ext4 partition and installs the Simple File System protocol.
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@param[in] DeviceHandle Handle to the block device.
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@param[in] DiskIo Pointer to an EFI_DISK_IO_PROTOCOL.
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@param[in opt] DiskIo2 Pointer to an EFI_DISK_IO2_PROTOCOL, if supported.
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@param[in] BlockIo Pointer to an EFI_BLOCK_IO_PROTOCOL.
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@retval EFI_SUCCESS The opening was successful.
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!EFI_SUCCESS Opening failed.
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**/
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EFI_STATUS
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Ext4OpenPartition (
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IN EFI_HANDLE DeviceHandle,
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IN EFI_DISK_IO_PROTOCOL *DiskIo,
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IN OPTIONAL EFI_DISK_IO2_PROTOCOL *DiskIo2,
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IN EFI_BLOCK_IO_PROTOCOL *BlockIo
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)
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{
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EXT4_PARTITION *Part;
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EFI_STATUS Status;
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Part = AllocateZeroPool (sizeof (*Part));
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if (Part == NULL) {
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return EFI_OUT_OF_RESOURCES;
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}
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InitializeListHead (&Part->OpenFiles);
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Part->BlockIo = BlockIo;
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Part->DiskIo = DiskIo;
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Part->DiskIo2 = DiskIo2;
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Status = Ext4OpenSuperblock (Part);
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if (EFI_ERROR (Status)) {
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FreePool (Part);
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return Status;
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}
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Part->Interface.Revision = EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_REVISION;
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Part->Interface.OpenVolume = Ext4OpenVolume;
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Status = gBS->InstallMultipleProtocolInterfaces (
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&DeviceHandle,
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&gEfiSimpleFileSystemProtocolGuid,
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&Part->Interface,
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NULL
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);
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if (EFI_ERROR (Status)) {
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FreePool (Part);
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return Status;
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}
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return EFI_SUCCESS;
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}
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/**
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Sets up the protocol and metadata of a file that is being opened.
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@param[in out] File Pointer to the file.
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@param[in] Partition Pointer to the opened partition.
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**/
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VOID
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Ext4SetupFile (
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IN OUT EXT4_FILE *File,
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IN EXT4_PARTITION *Partition
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)
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{
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// Note: We don't yet support revision 2 of the file protocol
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// (needs DISK_IO2 + asynchronous IO)
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File->Protocol.Revision = EFI_FILE_PROTOCOL_REVISION;
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File->Protocol.Open = Ext4Open;
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File->Protocol.Close = Ext4Close;
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File->Protocol.Delete = Ext4Delete;
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File->Protocol.Read = Ext4ReadFile;
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File->Protocol.Write = Ext4WriteFile;
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File->Protocol.SetPosition = Ext4SetPosition;
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File->Protocol.GetPosition = Ext4GetPosition;
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File->Protocol.GetInfo = Ext4GetInfo;
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File->Protocol.SetInfo = Ext4SetInfo;
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File->Partition = Partition;
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}
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/**
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Unmounts and frees an ext4 partition.
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@param[in] Partition Pointer to the opened partition.
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@retval Status of the unmount.
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**/
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EFI_STATUS
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Ext4UnmountAndFreePartition (
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IN EXT4_PARTITION *Partition
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)
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{
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LIST_ENTRY *Entry;
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LIST_ENTRY *NextEntry;
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EXT4_FILE *File;
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BOOLEAN DeletedRootDentry;
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Partition->Unmounting = TRUE;
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Ext4CloseInternal (Partition->Root);
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BASE_LIST_FOR_EACH_SAFE (Entry, NextEntry, &Partition->OpenFiles) {
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File = EXT4_FILE_FROM_OPEN_FILES_NODE (Entry);
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Ext4CloseInternal (File);
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}
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DeletedRootDentry = Ext4UnrefDentry (Partition->RootDentry);
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if (!DeletedRootDentry) {
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DEBUG ((DEBUG_ERROR, "[ext4] Failed to delete root dentry - resource leak present.\n"));
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}
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FreePool (Partition->BlockGroups);
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FreePool (Partition);
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return EFI_SUCCESS;
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}
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