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.
--cw
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