This fault injection hook causes all SEQUENCE operation replies to have the
SEQ4_STATUS_CB_PATH_DOWN flag set until the client calls BIND_CONN_TO_SESSION
or creates a new session.
Signed-off-by: Weston Andros Adamson <dros@xxxxxxxxxx>
---
fs/nfsd/fault_inject.c | 4 ++++
fs/nfsd/fault_inject.h | 2 ++
fs/nfsd/nfs4state.c | 20 ++++++++++++++++++++
3 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/fs/nfsd/fault_inject.c b/fs/nfsd/fault_inject.c
index e6c3815..ab81144 100644
--- a/fs/nfsd/fault_inject.c
+++ b/fs/nfsd/fault_inject.c
@@ -38,6 +38,10 @@ static struct nfsd_fault_inject_op inject_ops[] = {
.file = "recall_delegations",
.func = nfsd_recall_delegations,
},
+ {
+ .file = "kill_backchannel",
+ .func = nfsd_kill_backchannel,
+ },
};
static long int NUM_INJECT_OPS = sizeof(inject_ops) / sizeof(struct nfsd_fault_inject_op);
diff --git a/fs/nfsd/fault_inject.h b/fs/nfsd/fault_inject.h
index 90bd057..b058e03 100644
--- a/fs/nfsd/fault_inject.h
+++ b/fs/nfsd/fault_inject.h
@@ -15,6 +15,7 @@ void nfsd_forget_locks(u64);
void nfsd_forget_openowners(u64);
void nfsd_forget_delegations(u64);
void nfsd_recall_delegations(u64);
+void nfsd_kill_backchannel(u64);
#else /* CONFIG_NFSD_FAULT_INJECTION */
static inline int nfsd_fault_inject_init(void) { return 0; }
static inline void nfsd_fault_inject_cleanup(void) {}
@@ -23,6 +24,7 @@ static inline void nfsd_forget_locks(u64 num) {}
static inline void nfsd_forget_openowners(u64 num) {}
static inline void nfsd_forget_delegations(u64 num) {}
static inline void nfsd_recall_delegations(u64 num) {}
+static inline void nfsd_kill_backchannel(u64 num) {}
#endif /* CONFIG_NFSD_FAULT_INJECTION */
#endif /* LINUX_NFSD_FAULT_INJECT_H */
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 21266c7..9afc902 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4737,6 +4737,26 @@ void nfsd_recall_delegations(u64 num)
printk(KERN_INFO "NFSD: Recalled %d delegations", count);
}
+/*
+ * Force SEQUENCE operations to have SEQ4_STATUS_CB_PATH_DOWN flag set
+ * until backchannel is reestablished by BIND_CONN_TO_SESSION or
+ * DESTROY_SESSION/CREATE_SESSION with SP4_NONE.
+ *
+ * The argument 'num' is ignored, any value will trigger the fault on
+ * all clients.
+ */
+void nfsd_kill_backchannel(u64 num)
+{
+ struct nfs4_client *clp, *next;
+
+ nfs4_lock_state();
+ list_for_each_entry_safe(clp, next, &client_lru, cl_lru) {
+ clp->cl_cb_state = NFSD4_CB_DOWN;
+ }
+ nfs4_unlock_state();
+
+ printk(KERN_INFO "NFSD: killed backchannel");
+}
#endif /* CONFIG_NFSD_FAULT_INJECTION */
/* initialization to perform at module load time: */
--
1.7.4.4
--
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