1/*
 2 * Copyright (c) 2011 Bryan Schumaker <bjschuma@netapp.com>
 3 *
 4 * Uses debugfs to create fault injection points for client testing
 5 */
 6
 7#include <linux/types.h>
 8#include <linux/fs.h>
 9#include <linux/debugfs.h>
10#include <linux/module.h>
11
12#include "state.h"
13#include "fault_inject.h"
14
15struct nfsd_fault_inject_op {
16	char *file;
17	void (*func)(u64);
18};
19
20static struct nfsd_fault_inject_op inject_ops[] = {
21	{
22		.file   = "forget_clients",
23		.func   = nfsd_forget_clients,
24	},
25	{
26		.file   = "forget_locks",
27		.func   = nfsd_forget_locks,
28	},
29	{
30		.file   = "forget_openowners",
31		.func   = nfsd_forget_openowners,
32	},
33	{
34		.file   = "forget_delegations",
35		.func   = nfsd_forget_delegations,
36	},
37	{
38		.file   = "recall_delegations",
39		.func   = nfsd_recall_delegations,
40	},
41};
42
43static long int NUM_INJECT_OPS = sizeof(inject_ops) / sizeof(struct nfsd_fault_inject_op);
44static struct dentry *debug_dir;
45
46static int nfsd_inject_set(void *op_ptr, u64 val)
47{
48	struct nfsd_fault_inject_op *op = op_ptr;
49
50	if (val == 0)
51		printk(KERN_INFO "NFSD Fault Injection: %s (all)", op->file);
52	else
53		printk(KERN_INFO "NFSD Fault Injection: %s (n = %llu)", op->file, val);
54
55	op->func(val);
56	return 0;
57}
58
59static int nfsd_inject_get(void *data, u64 *val)
60{
61	*val = 0;
62	return 0;
63}
64
65DEFINE_SIMPLE_ATTRIBUTE(fops_nfsd, nfsd_inject_get, nfsd_inject_set, "%llu\n");
66
67void nfsd_fault_inject_cleanup(void)
68{
69	debugfs_remove_recursive(debug_dir);
70}
71
72int nfsd_fault_inject_init(void)
73{
74	unsigned int i;
75	struct nfsd_fault_inject_op *op;
76	umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
77
78	debug_dir = debugfs_create_dir("nfsd", NULL);
79	if (!debug_dir)
80		goto fail;
81
82	for (i = 0; i < NUM_INJECT_OPS; i++) {
83		op = &inject_ops[i];
84		if (!debugfs_create_file(op->file, mode, debug_dir, op, &fops_nfsd))
85			goto fail;
86	}
87	return 0;
88
89fail:
90	nfsd_fault_inject_cleanup();
91	return -ENOMEM;
92}