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
15 struct nfsd_fault_inject_op {
16 char *file;
17 void (*func)(u64);
18 };
19
20 static 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
43 static long int NUM_INJECT_OPS = sizeof(inject_ops) / sizeof(struct nfsd_fault_inject_op);
44 static struct dentry *debug_dir;
45
nfsd_inject_set(void * op_ptr,u64 val)46 static 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
nfsd_inject_get(void * data,u64 * val)59 static int nfsd_inject_get(void *data, u64 *val)
60 {
61 return 0;
62 }
63
64 DEFINE_SIMPLE_ATTRIBUTE(fops_nfsd, nfsd_inject_get, nfsd_inject_set, "%llu\n");
65
nfsd_fault_inject_cleanup(void)66 void nfsd_fault_inject_cleanup(void)
67 {
68 debugfs_remove_recursive(debug_dir);
69 }
70
nfsd_fault_inject_init(void)71 int nfsd_fault_inject_init(void)
72 {
73 unsigned int i;
74 struct nfsd_fault_inject_op *op;
75 mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
76
77 debug_dir = debugfs_create_dir("nfsd", NULL);
78 if (!debug_dir)
79 goto fail;
80
81 for (i = 0; i < NUM_INJECT_OPS; i++) {
82 op = &inject_ops[i];
83 if (!debugfs_create_file(op->file, mode, debug_dir, op, &fops_nfsd))
84 goto fail;
85 }
86 return 0;
87
88 fail:
89 nfsd_fault_inject_cleanup();
90 return -ENOMEM;
91 }
92