/* Pass 4 checks the bitmaps to be consistent */
void pass4()
{
int i;
int bitmap;
int change_req = 0;
/* Check for discrepancies in the inode bitmap */
for (i = get_vistied_index(EXT2_ROOT_INO); i < super_block->s_inodes_count; ++i)
{
/* Skip the reserved inodes */
if (i >= get_vistied_index(EXT2_ROOT_INO) && \
i <= get_vistied_index(EXT2_FIRST_INO(super_block)))
continue;
bitmap = is_inode_allocated(i);
if (bitmap && !inode_link[i])
{
/* Clear this inode from the inode bitmap */
printf("Pass 4: Inode %d : bitmap is inconsistent with inode table:\
%d Vs %d\n",i + 1, bitmap, inode_link[i]);
set_inode_bitmap(i, 0);
change_req = 1;
}
else if (!bitmap && inode_link[i])
uint8_t* ramdisk_init(){
int i;
uint8_t* ramdisk;
int root_bid;
struct rd_inode* root_inode;
struct rd_super_block* InitSuperBlock;
#ifdef UL_DEBUG
if(!(ramdisk=(uint8_t*)malloc(RAMDISK_SIZE*sizeof(uint8_t)))){
fprintf(stderr,"No sufficient mem space for ramdisk!\n");
exit(-1);
}
#endif
#ifndef UL_DEBUG
if(!(ramdisk=(uint8_t*)vmalloc(RAMDISK_SIZE*sizeof(uint8_t)))){
printk("<1> No sufficient mem space for ramdisk!\n");
return NULL;
}
#endif
//Nullify all the data in ramdisk
memset(ramdisk,0,RAMDISK_SIZE);
//Init the bitmap
for(i=0;i<=(BITMAP_LIMIT+1)/RD_BLOCK_SIZE;i++){
set_bitmap(ramdisk,i);
}
//Init the root directory
root_bid=find_next_free_block(ramdisk);//BlockNO for root dir
#ifdef UL_DEBUG
if(!(root_inode=(struct rd_inode*)malloc(sizeof(struct rd_inode)))){
fprintf(stderr, "No sufficient mem space for root dir!\n");
exit(-1);
}
#endif
#ifndef UL_DEBUG
if(!(root_inode=(struct rd_inode*)vmalloc(sizeof(struct rd_inode)))){
printk("<1> No sufficient mem space for root dir!\n");
return NULL;
}
#endif
root_inode->type=0;
root_inode->size=0;
root_inode->BlockPointer[0]=root_bid;
update_inode(ramdisk,0,root_inode);
//Init the superblock
#ifdef UL_DEBUG
if(!(InitSuperBlock=(struct rd_super_block*)malloc(sizeof(struct rd_super_block)))){
fprintf(stderr,"No sufficient mem\n");
exit(-1);
}
#endif
#ifndef UL_DEBUG
if(!(InitSuperBlock=(struct rd_super_block*)vmalloc(sizeof(struct rd_super_block)))){
printk("<1> No sufficient mem\n");
return NULL;
}
#endif
InitSuperBlock->FreeBlockNum=BLOCK_NUM-(BITMAP_LIMIT+1)/RD_BLOCK_SIZE;
InitSuperBlock->FreeInodeNum=INODE_NUM-1;//The root dir takes one inode
memset(InitSuperBlock->InodeBitmap,0,INODEBITMAP_SIZE);
update_superblock(ramdisk,InitSuperBlock);
//Init the inode bitmap in superblock
set_inode_bitmap(ramdisk,0);
#ifndef UL_DEBUG
vfree(root_inode);
#endif
return ramdisk;
}
