[patch 1/7] documentation and scripts

[Akinobu Mita <akinobu.mita@gmail.com>]

From: Akinobu Mita <akinobu.mita@gmail.com>

This patch set provides some fault-injection capabilities.

- kmalloc() failures

- alloc_pages() failures

- disk IO errors

We can see what really happens if those failures happen.

In order to enable these fault-injection capabilities:

1. Enable relevant config options (CONFIG_FAILSLAB, CONFIG_PAGE_ALLOC,
   CONFIG_MAKE_REQUEST) and if you want to configure them via debugfs,
   enable CONFIG_FAULT_INJECTION_DEBUG_FS.

2. Build and boot with this kernel

3. Configure fault-injection capabilities behavior by boot option or debugfs

   - Boot option

     failslab=
     fail_page_alloc=
     fail_make_request=

   - Debugfs

     /debug/failslab/*
     /debug/fail_page_alloc/*
     /debug/fail_make_request/*

   Please refer to the Documentation/fault-injection/fault-injection.txt
   for details.

4. See what really happens.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Don Mullis <dwm@meer.net>

 Documentation/fault-injection/failcmd.sh          |    4 
 Documentation/fault-injection/failmodule.sh       |   31 +++
 Documentation/fault-injection/fault-injection.txt |  180 ++++++++++++++++++++++
 Documentation/kernel-parameters.txt               |    7 
 4 files changed, 222 insertions(+)

Index: work-fault-inject/Documentation/fault-injection/failcmd.sh
===================================================================
--- /dev/null
+++ work-fault-inject/Documentation/fault-injection/failcmd.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+echo 1 > /proc/self/make-it-fail
+exec $*
Index: work-fault-inject/Documentation/fault-injection/failmodule.sh
===================================================================
--- /dev/null
+++ work-fault-inject/Documentation/fault-injection/failmodule.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+#
+# Usage: failmodule <failname> <modulename> [stacktrace-depth]
+#
+#	<failname>: "failslab", "fail_alloc_page", or "fail_make_request"
+#
+#	<modulename>: module name that you want to inject faults.
+#
+#	[stacktrace-depth]: the maximum number of stacktrace walking allowed
+#
+
+STACKTRACE_DEPTH=5
+if [ $# -gt 2 ]; then
+	STACKTRACE_DEPTH=$3
+fi
+
+if [ ! -d /debug/$1 ]; then
+	echo "Fault-injection $1 does not exist" >&2
+	exit 1
+fi
+if [ ! -d /sys/module/$2 ]; then
+	echo "Module $2 does not exist" >&2
+	exit 1
+fi
+
+# Disable any fault injection
+echo 0 > /debug/$1/stacktrace-depth
+
+echo `cat /sys/module/$2/sections/.text` > /debug/$1/address-start
+echo `cat /sys/module/$2/sections/.exit.text` > /debug/$1/address-end
+echo $STACKTRACE_DEPTH > /debug/$1/stacktrace-depth
Index: work-fault-inject/Documentation/fault-injection/fault-injection.txt
===================================================================
--- /dev/null
+++ work-fault-inject/Documentation/fault-injection/fault-injection.txt
@@ -0,0 +1,180 @@
+Fault injection capabilities infrastructure
+===========================================
+
+See also drivers/md/faulty.c and "every_nth" module option for scsi_debug.
+
+
+Available fault injection capabilities
+--------------------------------------
+
+o failslab
+
+  injects slab allocation failures. (kmalloc(), kmem_cache_alloc(), ...)
+
+o fail_page_alloc
+
+  injects page allocation failures. (alloc_pages(), get_free_pages(), ...)
+
+o fail_make_request
+
+  injects disk IO errors on permitted devices by
+  /sys/block/<device>/make-it-fail or
+  /sys/block/<device>/<partition>/make-it-fail. (generic_make_request())
+
+Configure fault-injection capabilities behavior
+-----------------------------------------------
+
+o debugfs entries
+
+fault-inject-debugfs kernel module provides some debugfs entries for runtime
+configuration of fault-injection capabilities.
+
+- /debug/*/probability:
+
+	likelihood of failure injection, in percent.
+
+- /debug/*/interval:
+
+	specifies the interval between failures, for calls to
+	should_fail() that pass all the other tests.
+
+	Note that if you enable this, by setting interval>1, you will
+	probably want to set probability=100.
+
+- /debug/*/times:
+
+	specifies how many times failures may happen at most.
+	A value of -1 means "no limit".
+
+- /debug/*/space:
+
+	specifies an initial resource "budget", decremented by "size"
+	on each call to should_fail(,size).  Failure injection is
+	suppressed until "space" reaches zero.
+
+- /debug/*/verbose
+
+	specifies the verbosity of the messages when failure is injected.
+	A value of '0' means no any messages, setting it to '1' will
+	print just to tell failure happened, and '2' will also
+	print call trace.  This is useful to debug the problems revealed by
+	fault injection capabilities.
+
+- /debug/*/task-filter:
+
+	A value of '0' disables filtering by process.
+	Any positive value limits failures to only processes indicated by
+	/proc/<pid>/make-it-fail==1.
+
+- /debug/*/stacktrace-depth:
+
+	specifies the maximum stacktrace depth walked during search
+	for a caller within [address-start,address-end).
+
+- /debug/*/address-start:
+- /debug/*/address-end:
+
+	specifies the range of virtual addresses tested during
+	stacktrace walking.  Failure is injected only if some caller
+	in the walked stacktrace lies within this range.
+
+o Boot option
+
+In order to inject faults while debugfs is not available (early boot time),
+use the boot option:
+
+    failslab=
+    fail_page_alloc=
+    fail_make_request=<interval>,<probability>,<space>,<times>
+
+How to add new fault injection capability
+-----------------------------------------
+
+o #include <linux/fault-inject.h>
+
+o define the fault attributes
+
+  DEFINE_FAULT_INJECTION(name);
+
+  Please see the definition of struct fault_attr in fault-inject.h
+  for details.
+
+o provide the way to configure fault attributes
+
+- boot option
+
+  If you need to enable the fault injection capability from boot time, you can
+  provide boot option to configure it. There is a helper function for it.
+
+  setup_fault_attr(attr, str);
+
+- debugfs entries
+
+  failslab, fail_page_alloc, and fail_make_request use this way.
+  There is a helper function for it.
+
+  init_fault_attr_entries(entries, attr, name);
+  void cleanup_fault_attr_entries(entries);
+
+- module parameters
+
+  If the scope of the fault injection capability is limited to a
+  single kernel module, it is better to provide module parameters to
+  configure the fault attributes.
+
+o add a hook to insert failures
+
+  should_fail() returns 1 when failures should happen.
+
+	should_fail(attr,size);
+
+Application Examples
+--------------------
+
+o inject slab allocation failures into module init/cleanup code
+
+------------------------------------------------------------------------------
+#!/bin/bash
+
+FAILCMD=Documentation/fault-injection/failcmd.sh
+
+echo Y > /debug/failslab/task-filter
+echo 10 > /debug/failslab/probability
+echo -1 > /debug/failslab/times
+
+oops()
+{
+	dmesg | grep BUG > /dev/null 2>&1 
+}
+
+find /lib/modules/`uname -r` -name '*.ko' -exec basename {} .ko \; |
+	while read i && ! oops
+	do
+		echo inserting $i...
+		bash $FAILCMD modprobe $i
+	done
+
+lsmod | awk '{ if ($3 == 0) { print $1 } }' |
+	while read i && ! oops
+	do
+		echo removing $i...
+		bash $FAILCMD modprobe -r $i
+	done
+
+------------------------------------------------------------------------------
+
+o inject slab allocation failures only for a specific module
+
+------------------------------------------------------------------------------
+#!/bin/bash
+
+FAILMOD=Documentation/fault-injection/failmodule.sh
+
+echo injecting errors into the module $1...
+
+modprobe $1
+bash $FAILMOD failslab $1 10
+echo 25 > /debug/failslab/probability
+
+------------------------------------------------------------------------------
+
Index: work-fault-inject/Documentation/kernel-parameters.txt
===================================================================
--- work-fault-inject.orig/Documentation/kernel-parameters.txt
+++ work-fault-inject/Documentation/kernel-parameters.txt
@@ -545,6 +545,13 @@ and is between 256 and 4096 characters. 
 	eurwdt=		[HW,WDT] Eurotech CPU-1220/1410 onboard watchdog.
 			Format: <io>[,<irq>]
 
+	failslab=
+	fail_page_alloc=
+	fail_make_request=[KNL]
+			General fault injection mechanism.
+			Format: <interval>,<probability>,<space>,<times>
+			See also /Documentation/fault-injection/.
+
 	fd_mcs=		[HW,SCSI]
 			See header of drivers/scsi/fd_mcs.c.
 

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