fault_inject.c 2.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * fault injection support for nvme.
  4. *
  5. * Copyright (c) 2018, Oracle and/or its affiliates
  6. */
  7. #include <linux/moduleparam.h>
  8. #include "nvme.h"
  9. static DECLARE_FAULT_ATTR(fail_default_attr);
  10. /* optional fault injection attributes boot time option:
  11. * nvme_core.fail_request=<interval>,<probability>,<space>,<times>
  12. */
  13. static char *fail_request;
  14. module_param(fail_request, charp, 0000);
  15. void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,
  16. const char *dev_name)
  17. {
  18. struct dentry *dir, *parent;
  19. struct fault_attr *attr = &fault_inj->attr;
  20. /* set default fault injection attribute */
  21. if (fail_request)
  22. setup_fault_attr(&fail_default_attr, fail_request);
  23. /* create debugfs directory and attribute */
  24. parent = debugfs_create_dir(dev_name, NULL);
  25. if (!parent) {
  26. pr_warn("%s: failed to create debugfs directory\n", dev_name);
  27. return;
  28. }
  29. *attr = fail_default_attr;
  30. dir = fault_create_debugfs_attr("fault_inject", parent, attr);
  31. if (IS_ERR(dir)) {
  32. pr_warn("%s: failed to create debugfs attr\n", dev_name);
  33. debugfs_remove_recursive(parent);
  34. return;
  35. }
  36. fault_inj->parent = parent;
  37. /* create debugfs for status code and dont_retry */
  38. fault_inj->status = NVME_SC_INVALID_OPCODE;
  39. fault_inj->dont_retry = true;
  40. debugfs_create_x16("status", 0600, dir, &fault_inj->status);
  41. debugfs_create_bool("dont_retry", 0600, dir, &fault_inj->dont_retry);
  42. }
  43. void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject)
  44. {
  45. /* remove debugfs directories */
  46. debugfs_remove_recursive(fault_inject->parent);
  47. }
  48. void nvme_should_fail(struct request *req)
  49. {
  50. struct gendisk *disk = req->rq_disk;
  51. struct nvme_fault_inject *fault_inject = NULL;
  52. u16 status;
  53. if (disk) {
  54. struct nvme_ns *ns = disk->private_data;
  55. if (ns)
  56. fault_inject = &ns->fault_inject;
  57. else
  58. WARN_ONCE(1, "No namespace found for request\n");
  59. } else {
  60. fault_inject = &nvme_req(req)->ctrl->fault_inject;
  61. }
  62. if (fault_inject && should_fail(&fault_inject->attr, 1)) {
  63. /* inject status code and DNR bit */
  64. status = fault_inject->status;
  65. if (fault_inject->dont_retry)
  66. status |= NVME_SC_DNR;
  67. nvme_req(req)->status = status;
  68. }
  69. }
  70. EXPORT_SYMBOL_GPL(nvme_should_fail);