fsinfo.c

#include <stdio.h>
#include <getopt.h>
#include "filesystem.h"

int main(int argc, char **argv){
    if(argc < 2) {
        puts("Not enough arguments! Check \"./fsinfo --help\" for proper use.");
        return MISSING_ARGS;
    }

    static struct option long_opt[] = {
        {"help",    no_argument,    0,  'h'},
        {0,         0,              0,  0}
    };

    char ch;
    while((ch = getopt_long(argc, argv, "", long_opt, NULL)) != -1) {
        switch(ch) {
            case 'h':
                printf("Usage:\n");
                printf("./fsinfo --help to show this message\n");
                printf("./fsinfo your_filesys_name to map the file system\n");
                return 0;
            case '?':
                break;
        }
    }

    FILE *fp;
    char *name = argv[1];
    fsys_SuperBlock fssb;

    if(!(fp = fopen(name, "r+b"))) {
        puts("No such file system exists!");
        return FILE_NOT_EXISTING;
    }

    fread(&fssb, sizeof(fsys_SuperBlock), 1, fp);
    printf("SUPERBLOCK\n"
           "Rozmiar bloku: %dkB\n"
           "iNode: %dkB, maks %d, bloki %d, offset %d\n"
           "liczba blokow danych %d, offset %d\n"
           "offset bitmap: iNode %d, data %d\n\n",
           fssb.blockSize,
           fssb.iNodeSize, fssb.iNodesCount, fssb.iNodesBlockNum, fssb.iNodesOffset,
           fssb.dataBlockNum, fssb.dataBlockOffset,
           fssb.iNodeBitmapOffset, fssb.dataBitmapOffset);

    char iNodeBitmap[fssb.iNodesCount];
    char dataBitmap[fssb.dataBlockNum];
    fsys_iNode iNodeTable[fssb.iNodesCount];

    fseek(fp, fssb.iNodeBitmapOffset*fssb.blockSize, SEEK_SET);
    fread(iNodeBitmap, sizeof(char), fssb.iNodesCount, fp);
    fseek(fp, fssb.iNodesOffset*fssb.blockSize, SEEK_SET);
    fread(iNodeTable, fssb.iNodeSize, fssb.iNodesCount, fp);

    fseek(fp, fssb.dataBitmapOffset*fssb.blockSize, SEEK_SET);
    fread(dataBitmap, sizeof(char), fssb.dataBlockNum, fp);
    fclose(fp);

    int iNodeCount = 0, rlSpace = 0;
    for(int i = 0; i < fssb.iNodesCount; ++i) {
        if(iNodeBitmap[i] != 0x00){
            iNodeCount++;
            rlSpace += iNodeTable[i].size;
        }
    }

    int dataBlockCount = 0;
    for(int i = 0; i < fssb.iNodesCount; ++i) {
        if(dataBitmap[i] != 0x00) dataBlockCount++;
    }

    printf("iNode table: 0x%x, it's occupied in %.2f%%\n",
           fssb.iNodesOffset*BLOCK_SIZE, 100*(float)iNodeCount/(float)fssb.iNodesCount);
    printf("File sys stores %d file(s)\n", iNodeCount);
    printf("iNode bitmap:\n");
    for(int i = 0; i < fssb.iNodesCount; ++i)
        printf("|%c", iNodeBitmap[i] == 0x00 ? 'O' : 'X');
    printf("|\n");

    printf("dataBlock table: 0x%x, it's occupied in %.2f%%\n",
        fssb.dataBitmapOffset*BLOCK_SIZE, 100*(float)dataBlockCount/(float)fssb.dataBlockNum);
    printf("Real data space usage = %.2f%%, %d bytes\n", 100*(float)rlSpace/((float)fssb.dataBlockNum*fssb.blockSize), rlSpace);
    printf("Data bitmap:\n");
    for(int i = 0; i < fssb.dataBlockNum; ++i)
        printf("|%c", dataBitmap[i] == 0x00 ? 'O' : 'X');
    printf("|\n");
}