[PATCH] fault-injection: fix example scripts in documentation

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

Fix and cleanup example scripts in fault injection documentation.

1. Eliminate broken oops() shell function.

2. Fold failcmd.sh and failmodule.sh into example scripts. It makes
   the example scripts work independent of current working directory.

3. Set "space" parameter to 0 to start injecting errors immediately.

4. Use /sys/module/<modulename>/sections/.data as upper bound of
   .text section. Because some module doesn't have .exit.text section.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>

---
 Documentation/fault-injection/failcmd.sh          |    4 
 Documentation/fault-injection/failmodule.sh       |   31 ------
 Documentation/fault-injection/fault-injection.txt |  107 +++++++++++-----------
 3 files changed, 57 insertions(+), 85 deletions(-)

Index: 2.6-mm/Documentation/fault-injection/fault-injection.txt
===================================================================
--- 2.6-mm.orig/Documentation/fault-injection/fault-injection.txt
+++ 2.6-mm/Documentation/fault-injection/fault-injection.txt
@@ -161,70 +161,77 @@ o add a hook to insert failures
 Application Examples
 --------------------
 
-o inject slab allocation failures into module init/cleanup code
+o Inject slab allocation failures into module init/exit code
 
-------------------------------------------------------------------------------
 #!/bin/bash
 
-FAILCMD=Documentation/fault-injection/failcmd.sh
-BLACKLIST="root_plug evbug"
-
-FAILNAME=failslab
-echo Y > /debug/$FAILNAME/task-filter
-echo 10 > /debug/$FAILNAME/probability
-echo 100 > /debug/$FAILNAME/interval
-echo -1 > /debug/$FAILNAME/times
-echo 2 > /debug/$FAILNAME/verbose
-echo 1 > /debug/$FAILNAME/ignore-gfp-wait
+FAILTYPE=failslab
+echo Y > /debug/$FAILTYPE/task-filter
+echo 10 > /debug/$FAILTYPE/probability
+echo 100 > /debug/$FAILTYPE/interval
+echo -1 > /debug/$FAILTYPE/times
+echo 0 > /debug/$FAILTYPE/space
+echo 2 > /debug/$FAILTYPE/verbose
+echo 1 > /debug/$FAILTYPE/ignore-gfp-wait
 
-blacklist()
+faulty_system()
 {
-	echo $BLACKLIST | grep $1 > /dev/null 2>&1
+	bash -c "echo 1 > /proc/self/make-it-fail && exec $*"
 }
 
-oops()
-{
-	dmesg | grep BUG > /dev/null 2>&1
-}
-
-find /lib/modules/`uname -r` -name '*.ko' -exec basename {} .ko \; |
-	while read i
-	do
-		oops && exit 1
-
-		if ! blacklist $i
-		then
-			echo inserting $i...
-			bash $FAILCMD modprobe $i
-		fi
-	done
-
-lsmod | awk '{ if ($3 == 0) { print $1 } }' |
-	while read i
-	do
-		oops && exit 1
-
-		if ! blacklist $i
-		then
-			echo removing $i...
-			bash $FAILCMD modprobe -r $i
-		fi
-	done
+if [ $# -eq 0 ]
+then
+	echo "Usage: $0 modulename [ modulename ... ]"
+	exit 1
+fi
+
+for m in $*
+do
+	echo inserting $m...
+	faulty_system modprobe $m
+
+	echo removing $m...
+	faulty_system modprobe -r $m
+done
 
 ------------------------------------------------------------------------------
 
-o inject slab allocation failures only for a specific module
+o Inject page allocation failures only for a specific module
 
-------------------------------------------------------------------------------
 #!/bin/bash
 
-FAILMOD=Documentation/fault-injection/failmodule.sh
+FAILTYPE=fail_page_alloc
+module=$1
 
-echo injecting errors into the module $1...
+if [ -z $module ]
+then
+	echo "Usage: $0 <modulename>"
+	exit 1
+fi
+
+modprobe $module
+
+if [ ! -d /sys/module/$module/sections ]
+then
+	echo Module $module is not loaded
+	exit 1
+fi
+
+cat /sys/module/$module/sections/.text > /debug/$FAILTYPE/require-start
+cat /sys/module/$module/sections/.data > /debug/$FAILTYPE/require-end
+
+echo N > /debug/$FAILTYPE/task-filter
+echo 10 > /debug/$FAILTYPE/probability
+echo 100 > /debug/$FAILTYPE/interval
+echo -1 > /debug/$FAILTYPE/times
+echo 0 > /debug/$FAILTYPE/space
+echo 2 > /debug/$FAILTYPE/verbose
+echo 1 > /debug/$FAILTYPE/ignore-gfp-wait
+echo 1 > /debug/$FAILTYPE/ignore-gfp-highmem
+echo 10 > /debug/$FAILTYPE/stacktrace-depth
 
-modprobe $1
-bash $FAILMOD failslab $1 10
-echo 25 > /debug/failslab/probability
+trap "echo 0 > /debug/$FAILTYPE/probability" SIGINT SIGTERM EXIT
 
-------------------------------------------------------------------------------
+echo "Injecting errors into the module $module... (interrupt to stop)"
+sleep 1000000
 
Index: 2.6-mm/Documentation/fault-injection/failcmd.sh
===================================================================
--- 2.6-mm.orig/Documentation/fault-injection/failcmd.sh
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/bash
-
-echo 1 > /proc/self/make-it-fail
-exec $*
Index: 2.6-mm/Documentation/fault-injection/failmodule.sh
===================================================================
--- 2.6-mm.orig/Documentation/fault-injection/failmodule.sh
+++ /dev/null
@@ -1,31 +0,0 @@
-#!/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/require-start
-echo `cat /sys/module/$2/sections/.exit.text` > /debug/$1/require-end
-echo $STACKTRACE_DEPTH > /debug/$1/stacktrace-depth