linux-kernel - [PATCH] Documentation: drop stale I/O barrier descriptions

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Date:	Wed, 28 Dec 2011 11:53:36 +0800
From:	Liu Bo <liubo2009@...fujitsu.com>
To:	<linux-kernel@...r.kernel.org>
Cc:	<jaxboe@...ionio.com>, <hch@....de>, <tj@...nel.org>
Subject: [PATCH] Documentation: drop stale I/O barrier descriptions

Sorry for double mails, missing to cc LKML...
===

Since we've applied writeback_cache_control.txt and removed barrier.txt,
drop the related descriptions in biodoc.txt.

Signed-off-by: Liu Bo <liubo2009@...fujitsu.com>
---
 Documentation/block/biodoc.txt |   21 ++-------------------
 1 files changed, 2 insertions(+), 19 deletions(-)

diff --git a/Documentation/block/biodoc.txt b/Documentation/block/biodoc.txt
index e418dc0..2ce818f 100644
--- a/Documentation/block/biodoc.txt
+++ b/Documentation/block/biodoc.txt
@@ -48,8 +48,7 @@ Description of Contents:
 	- Highmem I/O support
 	- I/O scheduler modularization
   1.2 Tuning based on high level requirements/capabilities
-	1.2.1 I/O Barriers
-	1.2.2 Request Priority/Latency
+	1.2.1 Request Priority/Latency
   1.3 Direct access/bypass to lower layers for diagnostics and special
       device operations
 	1.3.1 Pre-built commands
@@ -261,23 +260,7 @@ unused). As far as user applications are concerned they would need an
 additional mechanism either via open flags or ioctls, or some other upper
 level mechanism to communicate such settings to block.
 
-1.2.1 I/O Barriers
-
-There is a way to enforce strict ordering for i/os through barriers.
-All requests before a barrier point must be serviced before the barrier
-request and any other requests arriving after the barrier will not be
-serviced until after the barrier has completed. This is useful for higher
-level control on write ordering, e.g flushing a log of committed updates
-to disk before the corresponding updates themselves.
-
-A flag in the bio structure, BIO_BARRIER is used to identify a barrier i/o.
-The generic i/o scheduler would make sure that it places the barrier request and
-all other requests coming after it after all the previous requests in the
-queue. Barriers may be implemented in different ways depending on the
-driver. For more details regarding I/O barriers, please read barrier.txt
-in this directory.
-
-1.2.2 Request Priority/Latency
+1.2.1 Request Priority/Latency
 
 Todo/Under discussion:
 Arjan's proposed request priority scheme allows higher levels some broad
-- 
1.6.5.2

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