| 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 | #include <linux/nsproxy.h> |
| 12 | #include <linux/sunrpc/addr.h> |
| 13 | #include <asm/uaccess.h> |
| 14 | |
| 15 | #include "state.h" |
| 16 | #include "netns.h" |
| 17 | |
| 18 | struct nfsd_fault_inject_op { |
| 19 | char *file; |
| 20 | u64 (*get)(void); |
| 21 | u64 (*set_val)(u64); |
| 22 | u64 (*set_clnt)(struct sockaddr_storage *, size_t); |
| 23 | }; |
| 24 | |
| 25 | static struct dentry *debug_dir; |
| 26 | |
| 27 | static ssize_t fault_inject_read(struct file *file, char __user *buf, |
| 28 | size_t len, loff_t *ppos) |
| 29 | { |
| 30 | static u64 val; |
| 31 | char read_buf[25]; |
| 32 | size_t size; |
| 33 | loff_t pos = *ppos; |
| 34 | struct nfsd_fault_inject_op *op = file_inode(file)->i_private; |
| 35 | |
| 36 | if (!pos) |
| 37 | val = op->get(); |
| 38 | size = scnprintf(read_buf, sizeof(read_buf), "%llu\n", val); |
| 39 | |
| 40 | return simple_read_from_buffer(buf, len, ppos, read_buf, size); |
| 41 | } |
| 42 | |
| 43 | static ssize_t fault_inject_write(struct file *file, const char __user *buf, |
| 44 | size_t len, loff_t *ppos) |
| 45 | { |
| 46 | char write_buf[INET6_ADDRSTRLEN]; |
| 47 | size_t size = min(sizeof(write_buf) - 1, len); |
| 48 | struct net *net = current->nsproxy->net_ns; |
| 49 | struct sockaddr_storage sa; |
| 50 | struct nfsd_fault_inject_op *op = file_inode(file)->i_private; |
| 51 | u64 val; |
| 52 | char *nl; |
| 53 | |
| 54 | if (copy_from_user(write_buf, buf, size)) |
| 55 | return -EFAULT; |
| 56 | write_buf[size] = '\0'; |
| 57 | |
| 58 | /* Deal with any embedded newlines in the string */ |
| 59 | nl = strchr(write_buf, '\n'); |
| 60 | if (nl) { |
| 61 | size = nl - write_buf; |
| 62 | *nl = '\0'; |
| 63 | } |
| 64 | |
| 65 | size = rpc_pton(net, write_buf, size, (struct sockaddr *)&sa, sizeof(sa)); |
| 66 | if (size > 0) { |
| 67 | val = op->set_clnt(&sa, size); |
| 68 | if (val) |
| 69 | pr_info("NFSD [%s]: Client %s had %llu state object(s)\n", |
| 70 | op->file, write_buf, val); |
| 71 | } else { |
| 72 | val = simple_strtoll(write_buf, NULL, 0); |
| 73 | if (val == 0) |
| 74 | pr_info("NFSD Fault Injection: %s (all)", op->file); |
| 75 | else |
| 76 | pr_info("NFSD Fault Injection: %s (n = %llu)", |
| 77 | op->file, val); |
| 78 | val = op->set_val(val); |
| 79 | pr_info("NFSD: %s: found %llu", op->file, val); |
| 80 | } |
| 81 | return len; /* on success, claim we got the whole input */ |
| 82 | } |
| 83 | |
| 84 | static const struct file_operations fops_nfsd = { |
| 85 | .owner = THIS_MODULE, |
| 86 | .read = fault_inject_read, |
| 87 | .write = fault_inject_write, |
| 88 | }; |
| 89 | |
| 90 | void nfsd_fault_inject_cleanup(void) |
| 91 | { |
| 92 | debugfs_remove_recursive(debug_dir); |
| 93 | } |
| 94 | |
| 95 | static struct nfsd_fault_inject_op inject_ops[] = { |
| 96 | { |
| 97 | .file = "forget_clients", |
| 98 | .get = nfsd_inject_print_clients, |
| 99 | .set_val = nfsd_inject_forget_clients, |
| 100 | .set_clnt = nfsd_inject_forget_client, |
| 101 | }, |
| 102 | { |
| 103 | .file = "forget_locks", |
| 104 | .get = nfsd_inject_print_locks, |
| 105 | .set_val = nfsd_inject_forget_locks, |
| 106 | .set_clnt = nfsd_inject_forget_client_locks, |
| 107 | }, |
| 108 | { |
| 109 | .file = "forget_openowners", |
| 110 | .get = nfsd_inject_print_openowners, |
| 111 | .set_val = nfsd_inject_forget_openowners, |
| 112 | .set_clnt = nfsd_inject_forget_client_openowners, |
| 113 | }, |
| 114 | { |
| 115 | .file = "forget_delegations", |
| 116 | .get = nfsd_inject_print_delegations, |
| 117 | .set_val = nfsd_inject_forget_delegations, |
| 118 | .set_clnt = nfsd_inject_forget_client_delegations, |
| 119 | }, |
| 120 | { |
| 121 | .file = "recall_delegations", |
| 122 | .get = nfsd_inject_print_delegations, |
| 123 | .set_val = nfsd_inject_recall_delegations, |
| 124 | .set_clnt = nfsd_inject_recall_client_delegations, |
| 125 | }, |
| 126 | }; |
| 127 | |
| 128 | #define NUM_INJECT_OPS (sizeof(inject_ops)/sizeof(struct nfsd_fault_inject_op)) |
| 129 | |
| 130 | int nfsd_fault_inject_init(void) |
| 131 | { |
| 132 | unsigned int i; |
| 133 | struct nfsd_fault_inject_op *op; |
| 134 | umode_t mode = S_IFREG | S_IRUSR | S_IWUSR; |
| 135 | |
| 136 | debug_dir = debugfs_create_dir("nfsd", NULL); |
| 137 | if (!debug_dir) |
| 138 | goto fail; |
| 139 | |
| 140 | for (i = 0; i < NUM_INJECT_OPS; i++) { |
| 141 | op = &inject_ops[i]; |
| 142 | if (!debugfs_create_file(op->file, mode, debug_dir, op, &fops_nfsd)) |
| 143 | goto fail; |
| 144 | } |
| 145 | return 0; |
| 146 | |
| 147 | fail: |
| 148 | nfsd_fault_inject_cleanup(); |
| 149 | return -ENOMEM; |
| 150 | } |