linux/fs/nfsd/fault_inject.c
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   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}
  93
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