From mboxrd@z Thu Jan  1 00:00:00 1970
From: gao bo <yohoro1025@gmail.com>
Subject: How to invoke the "discard" operation over btrfs
Date: Wed, 15 Dec 2010 21:24:34 +0800
Message-ID: <AANLkTiko-0A4sDEK8TOOeJWq+BGZKt49raq+=krHMu4x@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
To: linux-btrfs@vger.kernel.org
Return-path: <linux-btrfs-owner@vger.kernel.org>
List-ID: <linux-btrfs.vger.kernel.org>

Hi all,
Is there anybody know how to invoke the "discard" operation over btrfs
filesystem?  Does delete a file by "rm" will trigger the "discard"
operation?
If I want to trigger "discard" operation,how should i do? if there any
pre-requires? such as the device must be ssd, btrfs should be mounted
with "-o discard".

Any suggestion is appreciated.

Thanks a lot!