#include <stdio.h>

int main(void) {
    printf("Tiny file-system crash-consistency demo\n");
    printf("Operation: append one data block (update inode, bitmap, data)\n\n");
    printf("Crash after 1 write:\n");
    printf("  data only     -> write lost, still consistent\n");
    printf("  inode only    -> pointer to garbage, bitmap mismatch\n");
    printf("  bitmap only   -> leaked block, no owner\n\n");
    printf("Crash after 2 writes:\n");
    printf("  inode+bitmap  -> metadata OK, garbage data\n");
    printf("  inode+data    -> bitmap mismatch\n");
    printf("  bitmap+data   -> leaked block\n\n");
    printf("Journaling solution: write transaction to log, commit, then checkpoint.\n");
    printf("Recovery: replay committed transactions only.\n");
    return 0;
}