Re: [zfs-discuss] how to convert zio->io_offset to disk block number?

2009-06-25 Thread zhihui Chen 
Thanks, fixes following two issues, I can get the right value:(1) Dividing
offset 0x657800(6649856) by 512 and take it as the iseek value.
(2) Run the dd command on device c2t0d0s0, not c2t0d0.

Zhihui

2009/6/26 m...@bruningsystems.com 

> Hi Zhihui Chen,
>
> zhihui Chen wrote:
>
>> Find that zio->io_offset is the absolute offset of device, not in sector
>> unit. And If we need use zdb -R to dump the block, we should use the offset
>> (zio->io_offset-0x40).
>>
>> 2009/6/25 zhihui Chen mailto:zhch...@gmail.com>>
>>
>>
>>I use following dtrace script to trace the postion of one file on zfs:
>>#!/usr/sbin/dtrace -qs
>>zio_done:entry
>>/((zio_t *)(arg0))->io_vd/
>>{
>>zio=(zio_t *)arg0;
>>printf("Offset:%x and Size:%x\n",zio->io_offset,zio->io_size);
>>printf("vd:%x\n",(unsigned long)(zio->io_vd));
>>printf("process name:%s\n",execname);
>>tracemem(zio->io_data,40);
>>stack();
>>}
>>and I run dd command:  "dd if=/export/dsk1/test1 bs=512 count=1",
>>the dtrace script will generate following it output:
>>
>>Offset:657800 and Size:200
>>vd:ff02d6a1a700
>>process name:sched
>>  
>>  zfs`zio_execute+0xa0
>>  genunix`taskq_thread+0x193
>>  unix`thread_start+0x8
>>^C
>>The tracemem output is the right context of file test1, which is a
>>512-byte text file. "zpool status" has following output:
>>pool: tpool
>>state: ONLINE
>>scrub: none requested
>>config:
>>NAMESTATE READ WRITE CKSUM
>>tpool   ONLINE   0 0 0
>>  c2t0d0ONLINE   0 0 0
>>errors: No known data errors
>>My question is how to translate zio->io_offset (0x657800, equal to
>>decimal number 6649856) outputed by dtace to block number on disk
>>c2t0d0?
>>I tried to use "dd if=/dev/dsk/c2t0d0 of=text iseek=6650112 bs=512
>>count=1" for a check,but the result is not right.
>>
>>  I assume that 6650112 is offset plus 0x40?  Try dividing 6650112 by
> 512 and using that
> as the iseek value.
> max
>
> Thanks
>>Zhihui
>>
>>
>> 
>>
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>>
>>
>
>
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Re: [zfs-discuss] how to convert zio->io_offset to disk block number?

2009-06-25 Thread zhihui Chen 
Find that zio->io_offset is the absolute offset of device, not in sector
unit. And If we need use zdb -R to dump the block, we should use the offset
(zio->io_offset-0x40).
2009/6/25 zhihui Chen 

> I use following dtrace script to trace the postion of one file on zfs:
>
> #!/usr/sbin/dtrace -qs
> zio_done:entry
> /((zio_t *)(arg0))->io_vd/
> {
> zio=(zio_t *)arg0;
> printf("Offset:%x and Size:%x\n",zio->io_offset,zio->io_size);
> printf("vd:%x\n",(unsigned long)(zio->io_vd));
> printf("process name:%s\n",execname);
> tracemem(zio->io_data,40);
> stack();
> }
>
> and I run dd command:  "dd if=/export/dsk1/test1 bs=512 count=1", the
> dtrace script will generate following it output:
>
> Offset:657800 and Size:200
> vd:ff02d6a1a700
> process name:sched
>   
>   zfs`zio_execute+0xa0
>   genunix`taskq_thread+0x193
>   unix`thread_start+0x8
> ^C
>
> The tracemem output is the right context of file test1, which is a 512-byte
> text file. "zpool status" has following output:
>
> pool: tpool
> state: ONLINE
> scrub: none requested
> config:
> NAMESTATE READ WRITE CKSUM
> tpool   ONLINE   0 0 0
>   c2t0d0ONLINE   0 0 0
> errors: No known data errors
>
> My question is how to translate zio->io_offset (0x657800, equal to decimal
> number 6649856) outputed by dtace to block number on disk c2t0d0?
> I tried to use "dd if=/dev/dsk/c2t0d0 of=text iseek=6650112 bs=512 count=1"
> for a check,but the result is not right.
>
> Thanks
> Zhihui
>
>
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[zfs-discuss] how to convert zio->io_offset to disk block number?

2009-06-25 Thread zhihui Chen 
I use following dtrace script to trace the postion of one file on zfs:

#!/usr/sbin/dtrace -qs
zio_done:entry
/((zio_t *)(arg0))->io_vd/
{
zio=(zio_t *)arg0;
printf("Offset:%x and Size:%x\n",zio->io_offset,zio->io_size);
printf("vd:%x\n",(unsigned long)(zio->io_vd));
printf("process name:%s\n",execname);
tracemem(zio->io_data,40);
stack();
}

and I run dd command:  "dd if=/export/dsk1/test1 bs=512 count=1", the dtrace
script will generate following it output:

Offset:657800 and Size:200
vd:ff02d6a1a700
process name:sched
  
  zfs`zio_execute+0xa0
  genunix`taskq_thread+0x193
  unix`thread_start+0x8
^C

The tracemem output is the right context of file test1, which is a 512-byte
text file. "zpool status" has following output:

pool: tpool
state: ONLINE
scrub: none requested
config:
NAMESTATE READ WRITE CKSUM
tpool   ONLINE   0 0 0
  c2t0d0ONLINE   0 0 0
errors: No known data errors

My question is how to translate zio->io_offset (0x657800, equal to decimal
number 6649856) outputed by dtace to block number on disk c2t0d0?
I tried to use "dd if=/dev/dsk/c2t0d0 of=text iseek=6650112 bs=512 count=1"
for a check,but the result is not right.

Thanks
Zhihui
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