Date: Mon, 26 Jan 2009 11:24:48 +0100 From: Lukasz Jaroszewski <lvj@nietykalni.org> To: Hans Petter Selasky <hselasky@c2i.net> Cc: freebsd-hackers@freebsd.org Subject: Re: write(2) to /dev/ad4 = EINVAL Message-ID: <3930e0780901260224ye4acbabx7a629ec8da195138@mail.gmail.com> In-Reply-To: <200901261109.43376.hselasky@c2i.net> References: <3930e0780901260135j1428e77fmfe7392770fcd31fc@mail.gmail.com> <200901261109.43376.hselasky@c2i.net>
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2009/1/26 Hans Petter Selasky <hselasky@c2i.net>:
> On Monday 26 January 2009, Lukasz Jaroszewski wrote:
>> Hi,
>> after opening /dev/ad4 with success for O_RDWR, I am getting [EINVAL]
>> from write(2), which according to man 2 write, means
>> `` [EINVAL] The pointer associated with d was
>> negative.'', as you can see below it is not true, I have tried
>> different block sizes, with same result.
>>
>> How can I write one byte to /dev/adN ?
>
> Hi,
>
> You cannot write one byte to /dev/adN, I think. Harddisks are block based.
> Please see:
>
> diskinfo -v ad4
>
> And especially the "sector size". When you seek and transfer data the offset
> and length must be a factor of the "sector size" or "block size". See also
> LBA, logical block address.
Yes, I have tried with bs=512 and multiplies, no luck.
root@~(0) diskinfo -v ad4
ad4
512 # sectorsize
2029805568 # mediasize in bytes (1.9G)
3964464 # mediasize in sectors
3933 # Cylinders according to firmware.
16 # Heads according to firmware.
63 # Sectors according to firmware.
ad:CFx20CARDx200000190C # Disk ident.
------------
Best Regards
Lukasz.
>
> --HPS
>
>
>>
>>
>> 1361 ow CALL open(0x80485e3,O_RDWR,<unused>0xbfbfecc8)
>> 1361 ow NAMI "/dev/ad4"
>> ;/dev/ad4 is DOS FAT formatted CF Card.
>> 1361 ow RET open 3
>>
>> 1361 ow CALL write(0x3,0xbfbfecb8,0x8)
>> 1361 ow RET write -1 errno 22 Invalid argument
>>
>> root@~(0) uname -r
>> 7.0-STABLE
>> -----------
>> Best Regards
>> Lukasz.
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>
>
>
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