vfs: Remove aio_linux

Triggered by https://bugzilla.samba.org/show_bug.cgi?id=13128 I think
this module should go. Once Linux aio will do what Samba needs, this
might be worth another look.

What we should instead do soon is support Linux preadv2 and the
RWF_NOWAIT flag to avoid the thread context switch whenever possible.

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

2 files changed, 0 insertions, 116 deletions

diff --git a/docs-xml/manpages/vfs_aio_linux.8.xml b/docs-xml/manpages/vfs_aio_linux.8.xml
deleted file mode 100644
index 3a009501820..00000000000
--- a/docs-xml/manpages/vfs_aio_linux.8.xml
+++ /dev/null
@@ -1,115 +0,0 @@
-<?xml version="1.0" encoding="iso-8859-1"?>
-<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
-<refentry id="vfs_aio_linux.8">
-
-<refmeta>
-	<refentrytitle>vfs_aio_linux</refentrytitle>
-	<manvolnum>8</manvolnum>
-	<refmiscinfo class="source">Samba</refmiscinfo>
-	<refmiscinfo class="manual">System Administration tools</refmiscinfo>
-	<refmiscinfo class="version">4.7</refmiscinfo>
-</refmeta>
-
-
-<refnamediv>
-	<refname>vfs_aio_linux</refname>
-	<refpurpose>implement async I/O in Samba vfs using Linux kernel aio calls</refpurpose>
-</refnamediv>
-
-<refsynopsisdiv>
-	<cmdsynopsis>
-		<command>vfs objects = aio_linux</command>
-	</cmdsynopsis>
-</refsynopsisdiv>
-
-<refsect1>
-	<title>DESCRIPTION</title>
-
-	<para>This VFS module is part of the
-	<citerefentry><refentrytitle>samba</refentrytitle>
-	<manvolnum>7</manvolnum></citerefentry> suite.</para>
-
-	<para>The <command>aio_linux</command> VFS module enables asynchronous
-	I/O for Samba on Linux kernels that have the kernel AIO calls available
-	without using the Posix AIO interface. Posix AIO can suffer from severe
-	limitations.  For example, on some Linux versions the
-	real-time signals that it uses are broken under heavy load.
-	Other systems only allow AIO when special kernel modules are
-	loaded or only allow a certain system-wide amount of async
-	requests being scheduled. Systems based on glibc (most Linux
-	systems) only allow a single outstanding request per file
-	descriptor which essentially makes Posix AIO useless on systems
-	using the glibc implementation.</para>
-
-	<para>To work around all these limitations, the aio_linux module
-	was written. It uses the Linux kernel AIO interface instead of the
-	internal Posix AIO interface to allow read and write calls
-	to be processed asynchronously. A queue size of 128 events
-	is used by default. To change this limit set the "aio num events"
-	parameter below.
-	</para>
-
-	<para>
-	Note that the smb.conf parameters <command>aio read size</command>
-	and <command>aio write size</command> must also be set appropriately
-	for this module to be active.
-	</para>
-
-	<para>This module MUST be listed last in any module stack as
-	the Samba VFS pread/pwrite interface is not thread-safe. This
-	module makes direct pread and pwrite system calls and does
-	NOT call the Samba VFS pread and pwrite interfaces.</para>
-
-</refsect1>
-
-
-<refsect1>
-	<title>EXAMPLES</title>
-
-	<para>Straight forward use:</para>
-
-<programlisting>
-        <smbconfsection name="[cooldata]"/>
-	<smbconfoption name="path">/data/ice</smbconfoption>
-	<smbconfoption name="aio read size">1024</smbconfoption>
-	<smbconfoption name="aio write size">1024</smbconfoption>
-	<smbconfoption name="vfs objects">aio_linux</smbconfoption>
-</programlisting>
-
-</refsect1>
-
-<refsect1>
-	<title>OPTIONS</title>
-
-	<variablelist>
-
-		<varlistentry>
-		<term>aio_linux:aio num events = INTEGER</term>
-		<listitem>
-		<para>Set the maximum size of the event queue
-		that is used to limit outstanding IO requests.
-		</para>
-		<para>By default this is set to 128.</para>
-		</listitem>
-		</varlistentry>
-
-	</variablelist>
-</refsect1>
-<refsect1>
-	<title>VERSION</title>
-
-	<para>This man page is correct for version 4.0 of the Samba suite.
-	</para>
-</refsect1>
-
-<refsect1>
-	<title>AUTHOR</title>
-
-	<para>The original Samba software and related utilities
-	were created by Andrew Tridgell. Samba is now developed
-	by the Samba Team as an Open Source project similar
-	to the way the Linux kernel is developed.</para>
-
-</refsect1>
-
-</refentry>
diff --git a/docs-xml/wscript_build b/docs-xml/wscript_build
index afba0b9e841..0bd08d11cdb 100644
--- a/docs-xml/wscript_build
+++ b/docs-xml/wscript_build
@@ -52,7 +52,6 @@ manpages='''
          manpages/vfs_acl_tdb.8
          manpages/vfs_acl_xattr.8
          manpages/vfs_aio_fork.8
-         manpages/vfs_aio_linux.8
          manpages/vfs_aio_pthread.8
          manpages/vfs_audit.8
 	 manpages/vfs_btrfs.8