Messages in this thread | ![/](/images/icornerl.gif) | | Date | Wed, 12 Feb 2003 14:07:27 -0800 | From | Chris Wedgwood <> | Subject | Re: O_DIRECT foolish question |
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On Wed, Feb 12, 2003 at 04:19:24PM -0500, Bruno Diniz de Paula wrote:
> I am trying to use O_DIRECT to read ordinary files and read syscall > always returns 0, unless when the file size equals the fs block > size.
Sounds correct.
> Is it true that I can only use O_DIRECT when the size of the file > written in the inode is a multiple of block size?
You usually can only do O_DIRECT reads/writes in multiples of the block size (or in some cases multiples of 512-bytes, but I'm not sure of that code is still about though).
It depends on the filesystem to some extent.
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