Proposal for adding O_DIRECT support into JDK 9

[Lu, Yingqi]

Hi Alan/Brian,

Here is a draft of the description. Please let me know if this is sufficient.

    /**
     * FileStore typically organizes storage into number of blocks. A block is
     * the smallest storage unit of the file store. Every read and write
     * operations are done on a multiple of blocks.
     *
     * @implSpec The implementation in this class throws an
     *         {@code UnsupportedOperationException}.
     *
     * @return  the block size of this file store, in bytes
     *
     * @throws  IOException
     *          if an I/O error occurs
     *
     * @throws  UnsupportedOperationException
     *          if operation is not supported
     *
     * @since 10
     */

Thanks,
Lucy

From: Alan Bateman [mailto:Alan.Bateman at oracle.com]
Sent: Monday, September 11, 2017 4:34 AM
To: Lu, Yingqi <yingqi.lu at intel.com>; Brian Burkhalter <brian.burkhalter at oracle.com>
Cc: nio-dev at openjdk.java.net
Subject: Re: Proposal for adding O_DIRECT support into JDK 9

On 08/09/2017 21:41, Lu, Yingqi wrote:

Hi Brian,

Please find the most recent version of the patch at http://cr.openjdk.java.net/~kkharbas/8164900/webrev.09/<http://cr.openjdk.java.net/%7Ekkharbas/8164900/webrev.09/>

One additional comment on FileStore::getBlockSize. We haven't defined the notion of "block" anywhere so I think we need to add some wording to this method to explain that FileStore will typically organized storage into blocks. One or two sentences should be enough.

-Alan
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