dscheck(da8): b_bcount 1024 is not on a sector boundary (ssize 4096)

[Tomohiro Kusumi]

You can see this with other fs too.
I saw this with ext2 (I mean ext2 on dfly) on usb stick.

2017-05-02 19:23 GMT+03:00 Matthew Dillon <dillon at backplane.com>:
> Interesting. The usb block device is actually reporting a sector size of
> 4KB.  If you want to experiment a little, try changing the BBSIZE macro in
> the ntfs module from 1024 to 4096 and recompiling it.  The BBSIZE macro is
> in /usr/src/sys/vfs/ntfs/ntfs.h (in DragonFlyBSD).  If you are unsure how to
> just recompile one module, then just recompile the whole kernel.
>
> I think the other block operations in ntfs are based on a block size defined
> in the filesystem volume header so there's a chance that this might solve
> the issue.
>
> -Matt
>
> On Tue, May 2, 2017 at 7:36 AM, Rod Person <rodperson at rodperson.com> wrote:
>>
>> Hi,
>>
>> I'm attempting to mount and external usb ntfs hard drive:
>>   <Seagate Backup+  Desk 0406> Fixed Direct Access SCSI-6 device
>>
>> In FreeBSD I mount it using the fuse driver, but being it isn't
>> available in DragonFly, I'm just attempting with mount_ntfs. I get
>> Invalid argument not matter how I try and mount it. I noticed the error:
>>
>> dscheck(da8): b_bcount 1024 is not on a sector boundary (ssize 4096)
>>
>> showing up in the dmesg and once when attempting to mount in the
>> console before starting X. That error doesn't show if I try and mount
>> in xterm, only writes to dmesg. I assume the the sector boundary is why
>> I can't mount it, but is there any way around this?
>>
>>
>> atomizer-dfly# mount_ntfs /dev/da8 /mnt/usb
>> mount_ntfs: /dev/da8: Invalid argument
>>
>> also tried /dev/da8s1 same result
>>
>> atomizer-dfly# dmesg | grep dscheck
>> dscheck(da8): b_bcount 1024 is not on a sector boundary (ssize 4096)
>> dscheck(da8s1): b_bcount 1024 is not on a sector boundary (ssize 4096)
>>
>>
>> atomizer-dfly# fdisk da8s1
>> ******* Working on device /dev/da8s1 *******
>> parameters extracted from device are:
>> cylinders=45600 heads=255 sectors/track=63 (16065 blks/cyl)
>>
>> Figures below won't work with BIOS for partitions not in cyl 1
>> parameters to be used for BIOS calculations are:
>> cylinders=45600 heads=255 sectors/track=63 (16065 blks/cyl)
>>
>> Media sector size is 4096
>> Warning: BIOS sector numbering starts with sector 1
>> Information from DOS bootblock is:
>> The data for partition 1 is:
>> sysid 79,(QNX 4.2 Tertiary)
>>     start 1936269394, size 1836016416 (7171939 Meg), flag d
>>         beg: cyl 335/ head 10/ sector 2;
>>         end: cyl 327/ head 84/ sector 13
>> The data for partition 2 is:
>> sysid 115,(unknown)
>>     start 1917848077, size 544437093 (2126707 Meg), flag 70
>>         beg: cyl 371/ head 114/ sector 37;
>>         end: cyl 256/ head 101/ sector 36
>> The data for partition 3 is:
>> sysid 43,(unknown)
>>     start 1818575915, size 544175136 (2125684 Meg), flag 43
>>         beg: cyl 364/ head 116/ sector 50;
>>         end: cyl 372/ head 65/ sector 44
>> The data for partition 4 is:
>> sysid 97,(Speed)
>>     start 2844524554, size 54974 (214 Meg), flag 72
>>         beg: cyl 372/ head 101/ sector 51;
>>         end: cyl 269/ head 114/ sector 52
>> --
>> Rod
>>
>> http://www.rodperson.com
>>
>> He who knows himself to be one way and pretends it is another way is a
>> thief who robs his own soul.
>>
>>   The Mahabharata
>>      Sakuntala 25
>
>