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store num_inode_blocks in superblock, choose this value adaptively according to disk size when mkfs

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This commit is contained in:
wangziao 2024-12-16 16:00:33 -08:00
parent bc9a7d0b3c
commit 26b44b20ba
5 changed files with 24 additions and 7 deletions
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2
include/fs.hpp
View File

@ -12,7 +12,7 @@ class DatablockOperation;
class Fs {
public:
Fs(RawDisk *disk);
Fs(RawDisk *disk, bool load = false);
~Fs();
ssize_t read(INode_Data *inode_data, char buf[], size_t count, size_t offset);

1
include/fs/fs_data_types.hpp
View File

@ -15,6 +15,7 @@ class SuperBlock_Data {
public:
u_int64_t free_list_head;
u_int64_t inode_list_head;
u_int64_t num_inode_blocks;
SuperBlock_Data();
void serialize(char buf[]);
void deserialize(char buf[]);

6
lib/fischl.cpp
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@ -227,7 +227,11 @@ int fischl(int argc, char *argv[])
return 0;
}
options.fs = new Fs(options.H);
if(!options.load){
if(options.load){
options.fs = new Fs(options.H, true);
}
else{
options.fs = new Fs(options.H);
printf("FORMAT %d\n", options.fs->format());
}
options.fsop = new FilesOperation(*options.H, options.fs);

19
lib/fs/fs.cpp
View File

@ -1,13 +1,22 @@
#include "fs.hpp"
#include <assert.h>
Fs::Fs(RawDisk *disk) : disk(disk) {
assert((disk->diskSize / IO_BLOCK_SIZE) >
2 + NUM_INODE_BLOCKS + DATABLOCKS_PER_BITMAP_BLOCK);
Fs::Fs(RawDisk *disk, bool load) : disk(disk) {
superblock = SuperBlock_Data();
inode_manager = new INode_Manager_Freelist(this, 1, 1 + NUM_INODE_BLOCKS);
// Determine the num inode blocks
uint64_t num_inode_blocks = 0; // The superblock is not loaded from disk here; it is done in FilesOperation::initialize called by fischl_init
if(load) {
load_superblock();
num_inode_blocks = superblock.num_inode_blocks;
} else {
num_inode_blocks = (disk->diskSize / IO_BLOCK_SIZE) / 8; // adaptive size
superblock.num_inode_blocks = num_inode_blocks;
}
assert((disk->diskSize / IO_BLOCK_SIZE) >
2 + num_inode_blocks + DATABLOCKS_PER_BITMAP_BLOCK);
inode_manager = new INode_Manager_Freelist(this, 1, 1 + num_inode_blocks);
datablock_manager = new DataBlock_Manager_Bitmap(
this, 1 + NUM_INODE_BLOCKS, disk->diskSize / IO_BLOCK_SIZE);
this, 1 + num_inode_blocks, disk->diskSize / IO_BLOCK_SIZE);
};
Fs::~Fs() {

3
lib/fs/fs_data_types.cpp
View File

@ -36,18 +36,21 @@ size_t read_u32(u_int32_t *num, char buf[]) {
SuperBlock_Data::SuperBlock_Data() {
free_list_head = 0;
inode_list_head = 0;
num_inode_blocks = 0;
}
void SuperBlock_Data::serialize(char buf[]) {
size_t i = 0;
i += write_u64(free_list_head, &buf[i]);
i += write_u64(inode_list_head, &buf[i]);
i += write_u64(num_inode_blocks, &buf[i]);
}
void SuperBlock_Data::deserialize(char buf[]) {
size_t i = 0;
i += read_u64(&free_list_head, &buf[i]);
i += read_u64(&inode_list_head, &buf[i]);
i += read_u64(&num_inode_blocks, &buf[i]);
}
INode_Data::INode_Data(u_int64_t inode_num) : inode_num(inode_num) {