Re: open(.. O_DIRECT ..) difference in between Linux and FreeBSD ..

Dave Jones (davej@codemonkey.org.uk)
Thu, 12 Jun 2003 15:58:14 +0100


On Thu, Jun 12, 2003 at 03:17:04PM +0200, Andries Brouwer wrote:
> Transfer sizes, and the alignment of user buffer
> and file offset must all be multiples of the logi-
> cal block size of the file system.

Just to confirm something that I wrote in the post-halloween-2.5 doc,
that doesn't tally with this..

- The size and alignment of O_DIRECT file IO requests now matches that
of the device, not the filesystem. Typically this means that
you can perform O_DIRECT IO with 512-byte granularity rather than 4k.

Is this a case of the man pages not following 2.5 yet, or is this
incorrect ?

Dave

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