NFSD: Added fault injection
Fault injection on the NFS server makes it easier to test the client's
state manager and recovery threads. Simulating errors on the server is
easier than finding the right conditions that cause them naturally.
This patch uses debugfs to add a simple framework for fault injection to
the server. This framework is a config option, and can be enabled
through CONFIG_NFSD_FAULT_INJECTION. Assuming you have debugfs mounted
to /sys/debug, a set of files will be created in /sys/debug/nfsd/.
Writing to any of these files will cause the corresponding action and
write a log entry to dmesg.
Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig
index 10e6366..8df1ea4 100644
--- a/fs/nfsd/Kconfig
+++ b/fs/nfsd/Kconfig
@@ -80,3 +80,13 @@
available from http://linux-nfs.org/.
If unsure, say N.
+
+config NFSD_FAULT_INJECTION
+ bool "NFS server manual fault injection"
+ depends on NFSD_V4 && DEBUG_KERNEL
+ help
+ This option enables support for manually injecting faults
+ into the NFS server. This is intended to be used for
+ testing error recovery on the NFS client.
+
+ If unsure, say N.