Commit | Line | Data |
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65178db4 BS |
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 | ||
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 | ||
59 | static int nfsd_inject_get(void *data, u64 *val) | |
60 | { | |
5fb35a3a | 61 | *val = 0; |
65178db4 BS |
62 | return 0; |
63 | } | |
64 | ||
65 | DEFINE_SIMPLE_ATTRIBUTE(fops_nfsd, nfsd_inject_get, nfsd_inject_set, "%llu\n"); | |
66 | ||
67 | void nfsd_fault_inject_cleanup(void) | |
68 | { | |
69 | debugfs_remove_recursive(debug_dir); | |
70 | } | |
71 | ||
72 | int nfsd_fault_inject_init(void) | |
73 | { | |
74 | unsigned int i; | |
75 | struct nfsd_fault_inject_op *op; | |
88187398 | 76 | umode_t mode = S_IFREG | S_IRUSR | S_IWUSR; |
65178db4 BS |
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 | ||
89 | fail: | |
90 | nfsd_fault_inject_cleanup(); | |
91 | return -ENOMEM; | |
92 | } |