Hi,
Attached my c file, kindly review and let me know if any mistakes that
i did in this file.
Thanks,
Gnana
2011/1/25 Vladimir 'φ-coder/phcoder' Serbinenko <[email protected]>:
> On 01/25/2011 07:02 AM, Gnanasekar Loganathan wrote:
>> Hi Vladimir,
>>
>> I'm using the grub_disk_write function to write the data.
>>
> This should work (as long as used right, of course).
>> My goal is to erase all the data in that particular partition.
>>
>>
> GRUB isn't the right place to write so much data. I recommend having a
> small kernel with ramdisk.
>> Booted os will do read and write operation on that partition.
>>
>> -Gnana
>>
>> 2011/1/24 Vladimir 'φ-coder/phcoder' Serbinenko <[email protected]>:
>>
>>> On 01/24/2011 03:49 PM, Gnanasekar Loganathan wrote:
>>>
>>>> Hi All,
>>>>
>>>> I try to opening a file called "(hd0,2,a)+10" from GRUB.
>>>>
>>>>
>>> This is old syntax. New one is (hd0,netbsd1)
>>>
>>>> For me open got success and able read some of the data.
>>>> But i'm not able to write some data into the file, getting "out of
>>>> partition" error.
>>>>
>>>>
>>> GRUB has no file writing functions whatsoever, only disk writing
>>> (grub_disk_write)
>>> You can look into save_env in grub-core/commands/loadenv.c for reference
>>> on the limited file overwrite possibilities.
>>> I would be able to help better if I knew what your end goal is.
>>>
>>>> Kindly help me, how to open, read and write into a raw file from the GRUB.
>>>>
>>>> FYI: Partition type is NetBSD one.
>>>>
>>>> If you need any info, kindly revert back.
>>>>
>>>> Thanks,
>>>> Gnana
>>>>
>>>> _______________________________________________
>>>> Grub-devel mailing list
>>>> [email protected]
>>>> http://lists.gnu.org/mailman/listinfo/grub-devel
>>>>
>>>>
>>>>
>>>
>>> --
>>> Regards
>>> Vladimir 'φ-coder/phcoder' Serbinenko
>>>
>>>
>>>
>>> _______________________________________________
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>>> [email protected]
>>> http://lists.gnu.org/mailman/listinfo/grub-devel
>>>
>>>
>>>
>> _______________________________________________
>> Grub-devel mailing list
>> [email protected]
>> http://lists.gnu.org/mailman/listinfo/grub-devel
>>
>>
>
>
> --
> Regards
> Vladimir 'φ-coder/phcoder' Serbinenko
>
>
>
> _______________________________________________
> Grub-devel mailing list
> [email protected]
> http://lists.gnu.org/mailman/listinfo/grub-devel
>
>
char rBuf[208 * 512] = {0};
static int dev_reset(void) {
char *dev_file = "(hd0,2,a)+2048";
grub_file_t file;
grub_disk_t disk;
grub_disk_addr_t part_start = 0;
grub_disk_addr_t bt_sector = 0;
unsigned bt_offset = 0;
unsigned bt_length = 0;
auto void NESTED_FUNC_ATTR read_hook (grub_disk_addr_t sector,
unsigned offset,
unsigned length);
void NESTED_FUNC_ATTR read_hook (grub_disk_addr_t sector,
unsigned offset, unsigned length) {
if( bt_sector == 0 ) {
bt_sector = sector;
bt_offset = offset;
bt_length = length;
grub_printf("bt_sector = %llu\nbt_offset = %u\nbt_length = %u\n",
bt_sector, bt_offset, bt_length);
} else {
grub_dprintf("bsd", "%s:%s:%d Still more...!\n",
__FILE__, __FUNCTION__, __LINE__);
}
}
file = grub_file_open(dev_file);
if( !file ) {
grub_printf("Error: Unable to open '%s' .\n", dev_file);
return grub_errno;
}
if( ! file->device->disk ) {
grub_printf("disk device required!\n");
return grub_errno;
}
file->read_hook = read_hook;
grub_file_read(file, rBuf, sizeof(rBuf));
file->read_hook = 0;
disk = file->device->disk;
grub_printf("File size: %llu\ntotal_sectors = %llu", file->size,
disk->total_sectors);
if( disk->partition )
part_start = grub_partition_get_start(disk->partition);
else
part_start = 0;
grub_printf("%s[%d]: %llu\n", __FUNCTION__, __LINE__, part_start);
if( bt_sector > part_start ) {
part_start = bt_sector - part_start;
}
grub_printf("%s[%d]: %llu\n", __FUNCTION__, __LINE__, part_start);
{
int i=0;
do {
grub_printf("%x ",rBuf[i++]);
} while(i<512);
}
grub_memset(nvbuf, 0, SECTOR_SIZE);
if(grub_disk_write(disk, part_start, 0, SECTOR_SIZE, nvbuf) ) {
grub_printf("%s %s:%d Disk write error!\n", __FILE__, __FUNCTION__, __LINE__);
grub_printf("disk = %x\n part_start = %llu\n", (unsigned int)disk, part_start);
} else
grub_dprintf("bsd", "Device reset done!");
grub_file_close(file);
return grub_errno;
}
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