Date: Mon, 26 Jan 2009 15:10:24 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: Lukasz Jaroszewski <lvj@nietykalni.org> Cc: freebsd-hackers@freebsd.org, Christoph Mallon <christoph.mallon@gmx.de> Subject: Re: write(2) to /dev/ad4 = EINVAL Message-ID: <200901261510.25074.hselasky@c2i.net> In-Reply-To: <3930e0780901260504m44f43958m82f2ba8902558906@mail.gmail.com> References: <3930e0780901260135j1428e77fmfe7392770fcd31fc@mail.gmail.com> <497D9116.1040408@gmx.de> <3930e0780901260504m44f43958m82f2ba8902558906@mail.gmail.com>
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On Monday 26 January 2009, Lukasz Jaroszewski wrote: > 2009/1/26 Christoph Mallon <christoph.mallon@gmx.de>: > > Lukasz Jaroszewski schrieb: > >> 2009/1/26 Hans Petter Selasky <hselasky@c2i.net>: > >>> On Monday 26 January 2009, Lukasz Jaroszewski wrote: Hi, > > It would be helpful, if you showed the actual code, instead of letting us > > guess what you are doing. > > Ok, I solved that, I were trying to dd with bs correctly set, tho > if=./s wasn't big enough plus I had code like below, where I didn't > check write for errors, just called perror, which gave me wrong errno. > > So to change one byte, I need to read it, change it, and write it in > 512 chunks? Yes! Maybe you should not write single bytes at a time in your design. > or play with kernel and add smth like ``write_byte'' to > ata? From my knowledge there is no standard harddisk command or SCSI command that can change only one byte at a time of the disk. It is all block based. And note that the block size can be different from 512 bytes. --HPS
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