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/*
* Copyright (c) 2011 Bryan Schumaker <bjschuma@netapp.com>
*
* Uses debugfs to create fault injection points for client testing
*/
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/debugfs.h>
#include <linux/module.h>
#include "state.h"
struct nfsd_fault_inject_op {
char *file;
u64 (*forget)(struct nfs4_client *, u64);
};
static struct nfsd_fault_inject_op inject_ops[] = {
{
.file = "forget_clients",
.forget = nfsd_forget_client,
},
{
.file = "forget_locks",
.forget = nfsd_forget_client_locks,
},
{
.file = "forget_openowners",
.forget = nfsd_forget_client_openowners,
},
{
.file = "forget_delegations",
.forget = nfsd_forget_client_delegations,
},
{
.file = "recall_delegations",
.forget = nfsd_recall_client_delegations,
},
};
static long int NUM_INJECT_OPS = sizeof(inject_ops) / sizeof(struct nfsd_fault_inject_op);
static struct dentry *debug_dir;
static int nfsd_inject_set(void *op_ptr, u64 val)
{
u64 count = 0;
struct nfsd_fault_inject_op *op = op_ptr;
if (val == 0)
printk(KERN_INFO "NFSD Fault Injection: %s (all)", op->file);
else
printk(KERN_INFO "NFSD Fault Injection: %s (n = %llu)", op->file, val);
nfs4_lock_state();
count = nfsd_for_n_state(val, op->forget);
nfs4_unlock_state();
printk(KERN_INFO "NFSD: %s: found %llu", op->file, count);
return 0;
}
static int nfsd_inject_get(void *data, u64 *val)
{
*val = 0;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(fops_nfsd, nfsd_inject_get, nfsd_inject_set, "%llu\n");
void nfsd_fault_inject_cleanup(void)
{
debugfs_remove_recursive(debug_dir);
}
int nfsd_fault_inject_init(void)
{
unsigned int i;
struct nfsd_fault_inject_op *op;
umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
debug_dir = debugfs_create_dir("nfsd", NULL);
if (!debug_dir)
goto fail;
for (i = 0; i < NUM_INJECT_OPS; i++) {
op = &inject_ops[i];
if (!debugfs_create_file(op->file, mode, debug_dir, op, &fops_nfsd))
goto fail;
}
return 0;
fail:
nfsd_fault_inject_cleanup();
return -ENOMEM;
}
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