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SubjectRe: DIRECT IO for ext3/ext2.
<dhruv.anand@wipro.com> wrote:
>
> Thanks for your reply. I looked into the boundary alignment issue.
> Observed something strange happening;
>
> I wrote my own kernel module and then;
> 1. retrieved the block size = 4096 using block_size(struct block_device
> *bdev)
> 2. in the user application i did a lseek by 4906 (block size seek)
> 3. then found the address of the variable i wanted to read into, to be
> block
> size aligned.

O_DIRECT works - trust me ;)

Please grab

http://www.zip.com.au/~akpm/linux/patches/stuff/ext3-tools.tar.gz

There are a number of examples in there (odread.c is one).


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