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62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: services/fs/ext2/super.c
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* PURPOSE: ext2 filesystem
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* PROGRAMMER: David Welch (welch@mcmail.com)
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* UPDATE HISTORY:
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*/
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/* INCLUDES *****************************************************************/
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#include <ntddk.h>
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#define NDEBUG
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#include <debug.h>
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#include "ext2fs.h"
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/* FUNCTIONS ****************************************************************/
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#define addr_per_block (BLOCKSIZE / sizeof(ULONG))
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ULONG Ext2BlockMap(PDEVICE_EXTENSION DeviceExt,
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struct ext2_inode* inode,
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ULONG offset)
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{
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ULONG block;
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PULONG TempBuffer;
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BOOL b;
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DPRINT("Ext2BlockMap(DeviceExt %x, inode %x, offset %d)\n",
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DeviceExt,inode,offset);
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if (offset < EXT2_NDIR_BLOCKS)
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{
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block = inode->i_block[offset];
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DPRINT("block %d\n",block);
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return(block);
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}
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offset = offset - EXT2_NDIR_BLOCKS;
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if (offset < addr_per_block)
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{
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block = inode->i_block[EXT2_IND_BLOCK];
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TempBuffer = ExAllocatePool(NonPagedPool, BLOCKSIZE);
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b = Ext2ReadSectors(DeviceExt->StorageDevice,
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block,
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1,
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TempBuffer);
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if (!b)
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{
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DbgPrint("ext2fs:%s:%d: Disk io failed\n", __FILE__, __LINE__);
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return(0);
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}
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block = TempBuffer[offset];
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ExFreePool(TempBuffer);
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return(block);
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}
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offset = offset - addr_per_block;
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DbgPrint("Failed at %s:%d\n",__FILE__,__LINE__);
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for(;;);
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}
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