mirror of
https://github.com/reactos/reactos.git
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136 lines
3.4 KiB
C
136 lines
3.4 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/minix/minix.c
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* PURPOSE: Minix FSD
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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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#include <string.h>
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#include "bitops.h"
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#include <ntifs.h>
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#define NDEBUG
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#include <debug.h>
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#include "minix.h"
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/* FUNCTIONS ****************************************************************/
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NTSTATUS MinixDeleteInode(PDEVICE_OBJECT Volume,
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MINIX_DEVICE_EXTENSION* DeviceExt,
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ULONG ino)
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{
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PULONG Buffer;
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ULONG off;
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Buffer = ExAllocatePool(NonPagedPool,BLOCKSIZE);
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MinixReadSector(Volume, (ino / 8192)+2, (PVOID)Buffer);
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off = ino % 8192;
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clear_bit(off%32,&Buffer[off/32]);
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MinixWriteSector(Volume, (ino / 8192)+2, (PVOID)Buffer);
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return(STATUS_SUCCESS);
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}
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static ULONG MinixAllocateInode(PDEVICE_OBJECT Volume,
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MINIX_DEVICE_EXTENSION* DeviceExt)
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{
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ULONG i;
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PULONG Buffer;
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ULONG ino;
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Buffer = ExAllocatePool(NonPagedPool,BLOCKSIZE);
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for (i=0; i<DeviceExt->sb->s_imap_blocks; i++)
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{
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MinixReadSector(Volume,i + 2,Buffer);
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ino = find_first_zero_bit(Buffer,8192);
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if (ino < 8192)
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{
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set_bit(ino%32,&Buffer[32]);
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MinixWriteSector(Volume,i + 2,Buffer);
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ExFreePool(Buffer);
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return(ino + (i*8192));
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}
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}
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ExFreePool(Buffer);
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return(0);
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}
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ULONG MinixNewInode(PDEVICE_OBJECT Volume,
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MINIX_DEVICE_EXTENSION* DeviceExt,
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struct minix_inode* new_inode)
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{
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ULONG ino;
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ino = MinixAllocateInode(Volume,DeviceExt);
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if (ino == 0)
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{
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return(0);
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}
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MinixWriteInode(Volume,DeviceExt,ino,new_inode);
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return(ino);
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}
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NTSTATUS MinixWriteInode(PDEVICE_OBJECT Volume,
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MINIX_DEVICE_EXTENSION* DeviceExt,
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ULONG ino,
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struct minix_inode* result)
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{
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int block;
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char* buffer;
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struct minix_inode* inodes;
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DPRINT("MinixWriteInode(ino %x, result %x)\n",ino,result);
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buffer = ExAllocatePool(NonPagedPool,1024);
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inodes = (struct minix_inode *)buffer;
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block = 2 + DeviceExt->sb->s_imap_blocks + DeviceExt->sb->s_zmap_blocks
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+ ((ino-1) / MINIX_INODES_PER_BLOCK);
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MinixReadSector(Volume,block,buffer);
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memcpy(&inodes[(ino-1)%MINIX_INODES_PER_BLOCK],result,
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sizeof(struct minix_inode));
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MinixWriteSector(Volume,block,buffer);
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ExFreePool(buffer);
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return(STATUS_SUCCESS);
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}
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NTSTATUS MinixReadInode(PDEVICE_OBJECT DeviceObject,
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MINIX_DEVICE_EXTENSION* DeviceExt,
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ULONG ino,
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struct minix_inode* result)
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{
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int block;
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struct minix_inode* inodes;
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PVOID BaseAddress;
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DPRINT("MinixReadInode(ino %x, result %x)\n",ino,result);
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block = 2 + DeviceExt->sb->s_imap_blocks + DeviceExt->sb->s_zmap_blocks
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+ ((ino-1) / MINIX_INODES_PER_BLOCK);
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DPRINT("Reading block %x offset %x\n",block,block*BLOCKSIZE);
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DPRINT("Index %x\n",(ino-1)%MINIX_INODES_PER_BLOCK);
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BaseAddress = ExAllocatePool(NonPagedPool, PAGE_SIZE);
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MinixReadPage(DeviceObject,
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block,
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BaseAddress);
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inodes = (struct minix_inode *)(BaseAddress + ((block % 4) * 512));
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memcpy(result,
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&inodes[(ino-1)%MINIX_INODES_PER_BLOCK],
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sizeof(struct minix_inode));
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DPRINT("result->i_uid %x\n",result->i_uid);
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DPRINT("result->i_size %x\n",result->i_size);
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ExFreePool(BaseAddress);
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return(STATUS_SUCCESS);
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}
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