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December 18, 2015 11:29
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Disable HFS+ journaling
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#include <stdio.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
#include <sys/types.h> | |
#include <sys/mman.h> | |
#include <fcntl.h> | |
#include <byteswap.h> | |
int main(int argc, char *argv[]) | |
{ | |
int fd = open(argv[1], O_RDWR); | |
if(fd < 0) { | |
perror("open"); | |
return -1; | |
} | |
unsigned char *buffer = (unsigned char *)mmap(NULL, 2048, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); | |
if(buffer == (unsigned char*)0xffffffff) { | |
perror("mmap"); | |
return -1; | |
} | |
if((buffer[1024] != 'H') && (buffer[1025] != '+')) { | |
fprintf(stderr, "%s: HFS+ signature not found -- aborting.\n", argv[0]); | |
return -1; | |
} | |
unsigned long attributes = *(unsigned long *)(&buffer[1028]); | |
attributes = bswap_32(attributes); | |
printf("attributes = 0x%8.8lx\n", attributes); | |
if(!(attributes & 0x00002000)) { | |
printf("kHFSVolumeJournaledBit not currently set in the volume attributes field.\n"); | |
} | |
attributes &= 0xffffdfff; | |
attributes = bswap_32(attributes); | |
*(unsigned long *)(&buffer[1028]) = attributes; | |
buffer[1032] = '1'; | |
buffer[1033] = '0'; | |
buffer[1034] = '.'; | |
buffer[1035] = '0'; | |
buffer[1036] = 0; | |
buffer[1037] = 0; | |
buffer[1038] = 0; | |
buffer[1039] = 0; | |
printf("journal has been disabled.\n"); | |
return 0; | |
} |
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