fs/nfsd/fault_inject.c

   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 {
  61         *val = 0;
  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;
  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
  89 fail:
  90         nfsd_fault_inject_cleanup();
  91         return -ENOMEM;
  92 }