67 lines
3.0 KiB
C
67 lines
3.0 KiB
C
#pragma once
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// io_file.h - VFS layer
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// Filesystem drivers register an IO_FILESYSTEM vtable via IoRegisterFilesystem.
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// Kernel and user code open files through IoOpenFile.
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#include <stdint.h>
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#include <stddef.h>
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#include <ke_status.h>
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#include <ob_object.h>
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// ---------------------------------------------------------------------------
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// Filesystem driver vtable - filled in by fat32.sys (or any future fs driver)
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// ---------------------------------------------------------------------------
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typedef struct IO_FILESYSTEM {
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// Open a file by absolute path (e.g. "apps\\shell.exe").
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// Returns an opaque per-file driver cookie in* fileCtx.
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KSTATUS (*Open)(struct IO_FILESYSTEM* fs,
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const char* path, void **fileCtx);
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// Read up to 'size' bytes at 'offset' into 'buf'.
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// Sets* bytesRead to actual bytes copied.
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KSTATUS (*Read)(struct IO_FILESYSTEM* fs, void* fileCtx,
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uint64_t offset, void* buf,
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size_t size, size_t* bytesRead);
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// Return the file size in bytes.
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uint64_t (*GetSize)(struct IO_FILESYSTEM* fs, void* fileCtx);
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// Release any resources the driver allocated for fileCtx.
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void (*Close)(struct IO_FILESYSTEM* fs, void* fileCtx);
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// Optional driver-private data.
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void* DriverCtx;
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} IO_FILESYSTEM;
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// ---------------------------------------------------------------------------
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// FILE_OBJECT - the kernel object returned to callers
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// ---------------------------------------------------------------------------
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typedef struct FILE_OBJECT {
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OBJECT Header; // must be first
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IO_FILESYSTEM* Fs;
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void* FileCtx; // driver cookie
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uint64_t Size;
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uint64_t Offset; // current position for sequential reads
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} FILE_OBJECT;
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typedef struct IO_VOLUME_PARAMS {
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uint8_t DiskIndex; // which disk in HAL_DISK table
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uint64_t PartitionLba; // starting LBA of this partition
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uint64_t PartitionSize; // sectors, for bounds checking
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} IO_VOLUME_PARAMS;
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// ---------------------------------------------------------------------------
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// Registration - called by fat32.sys from DriverEntry
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// ---------------------------------------------------------------------------
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// driveIndex matches the index passed to IoRegisterDisk.
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__declspec(dllexport) KSTATUS IoRegisterFilesystem(uint8_t driveIndex, IO_FILESYSTEM* fs, const IO_VOLUME_PARAMS *vol);
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// ---------------------------------------------------------------------------
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// Kernel-side API
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// ---------------------------------------------------------------------------
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__declspec(dllexport) KSTATUS IoOpenFile(const char* path, FILE_OBJECT **out);
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__declspec(dllexport) KSTATUS IoReadFile(FILE_OBJECT* file, void* buf,
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size_t size, size_t* bytesRead);
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__declspec(dllexport) KSTATUS IoSeekFile(FILE_OBJECT* file, uint64_t offset);
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__declspec(dllexport) uint64_t IoGetFileSize(FILE_OBJECT* file);
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__declspec(dllexport) void IoCloseFile(FILE_OBJECT* file);
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