> 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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/