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Bryan Schumaker65178db2011-11-01 13:35:21 -04001/*
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>
Bryan Schumaker6c1e82a2012-11-29 11:40:46 -050011#include <linux/nsproxy.h>
Jeff Layton59766872013-02-04 12:50:00 -050012#include <linux/sunrpc/addr.h>
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080013#include <linux/uaccess.h>
Bryan Schumaker65178db2011-11-01 13:35:21 -040014
15#include "state.h"
Bryan Schumaker6c1e82a2012-11-29 11:40:46 -050016#include "netns.h"
Bryan Schumaker65178db2011-11-01 13:35:21 -040017
18struct nfsd_fault_inject_op {
19 char *file;
Jeff Layton285abde2014-07-30 08:27:24 -040020 u64 (*get)(void);
21 u64 (*set_val)(u64);
22 u64 (*set_clnt)(struct sockaddr_storage *, size_t);
Bryan Schumaker65178db2011-11-01 13:35:21 -040023};
24
Bryan Schumaker65178db2011-11-01 13:35:21 -040025static struct dentry *debug_dir;
26
Bryan Schumakerd7cc4312012-11-29 11:40:45 -050027static 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];
Kinglong Meef3e41ec2014-04-08 13:04:01 +080032 size_t size;
Bryan Schumakerd7cc4312012-11-29 11:40:45 -050033 loff_t pos = *ppos;
Jeff Laytonc96223d2014-07-30 08:27:16 -040034 struct nfsd_fault_inject_op *op = file_inode(file)->i_private;
Bryan Schumakerd7cc4312012-11-29 11:40:45 -050035
36 if (!pos)
Jeff Layton285abde2014-07-30 08:27:24 -040037 val = op->get();
Bryan Schumakerd7cc4312012-11-29 11:40:45 -050038 size = scnprintf(read_buf, sizeof(read_buf), "%llu\n", val);
39
Kinglong Meef3e41ec2014-04-08 13:04:01 +080040 return simple_read_from_buffer(buf, len, ppos, read_buf, size);
Bryan Schumakerd7cc4312012-11-29 11:40:45 -050041}
42
43static ssize_t fault_inject_write(struct file *file, const char __user *buf,
44 size_t len, loff_t *ppos)
45{
Bryan Schumaker6c1e82a2012-11-29 11:40:46 -050046 char write_buf[INET6_ADDRSTRLEN];
Bryan Schumaker18d9a2c2012-12-07 16:17:29 -050047 size_t size = min(sizeof(write_buf) - 1, len);
Bryan Schumaker6c1e82a2012-11-29 11:40:46 -050048 struct net *net = current->nsproxy->net_ns;
49 struct sockaddr_storage sa;
Jeff Laytonc96223d2014-07-30 08:27:16 -040050 struct nfsd_fault_inject_op *op = file_inode(file)->i_private;
Bryan Schumakerd7cc4312012-11-29 11:40:45 -050051 u64 val;
Jeff Laytond4c8e342014-06-18 15:00:19 -040052 char *nl;
Bryan Schumakerd7cc4312012-11-29 11:40:45 -050053
54 if (copy_from_user(write_buf, buf, size))
55 return -EFAULT;
Bryan Schumaker6c1e82a2012-11-29 11:40:46 -050056 write_buf[size] = '\0';
Bryan Schumakerd7cc4312012-11-29 11:40:45 -050057
Jeff Laytond4c8e342014-06-18 15:00:19 -040058 /* 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
Bryan Schumaker6c1e82a2012-11-29 11:40:46 -050065 size = rpc_pton(net, write_buf, size, (struct sockaddr *)&sa, sizeof(sa));
Jeff Laytonc96223d2014-07-30 08:27:16 -040066 if (size > 0) {
Jeff Layton285abde2014-07-30 08:27:24 -040067 val = op->set_clnt(&sa, size);
Jeff Laytonc96223d2014-07-30 08:27:16 -040068 if (val)
69 pr_info("NFSD [%s]: Client %s had %llu state object(s)\n",
70 op->file, write_buf, val);
71 } else {
Bryan Schumaker6c1e82a2012-11-29 11:40:46 -050072 val = simple_strtoll(write_buf, NULL, 0);
Jeff Laytonc96223d2014-07-30 08:27:16 -040073 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);
Jeff Layton285abde2014-07-30 08:27:24 -040078 val = op->set_val(val);
Jeff Laytonc96223d2014-07-30 08:27:16 -040079 pr_info("NFSD: %s: found %llu", op->file, val);
Bryan Schumaker6c1e82a2012-11-29 11:40:46 -050080 }
Bryan Schumakerd7cc4312012-11-29 11:40:45 -050081 return len; /* on success, claim we got the whole input */
82}
83
84static const struct file_operations fops_nfsd = {
85 .owner = THIS_MODULE,
86 .read = fault_inject_read,
87 .write = fault_inject_write,
88};
Bryan Schumaker65178db2011-11-01 13:35:21 -040089
90void nfsd_fault_inject_cleanup(void)
91{
92 debugfs_remove_recursive(debug_dir);
93}
94
Jeff Laytonc96223d2014-07-30 08:27:16 -040095static struct nfsd_fault_inject_op inject_ops[] = {
96 {
97 .file = "forget_clients",
Jeff Layton7ec0e362014-07-30 08:27:17 -040098 .get = nfsd_inject_print_clients,
Jeff Layton69fc9ed2014-07-30 08:27:19 -040099 .set_val = nfsd_inject_forget_clients,
Jeff Laytona0926d12014-07-30 08:27:18 -0400100 .set_clnt = nfsd_inject_forget_client,
Jeff Laytonc96223d2014-07-30 08:27:16 -0400101 },
102 {
103 .file = "forget_locks",
Jeff Layton016200c2014-07-30 08:27:21 -0400104 .get = nfsd_inject_print_locks,
105 .set_val = nfsd_inject_forget_locks,
106 .set_clnt = nfsd_inject_forget_client_locks,
Jeff Laytonc96223d2014-07-30 08:27:16 -0400107 },
108 {
109 .file = "forget_openowners",
Jeff Layton82e05ef2014-07-30 08:27:22 -0400110 .get = nfsd_inject_print_openowners,
111 .set_val = nfsd_inject_forget_openowners,
112 .set_clnt = nfsd_inject_forget_client_openowners,
Jeff Laytonc96223d2014-07-30 08:27:16 -0400113 },
114 {
115 .file = "forget_delegations",
Jeff Layton98d5c7c2014-07-30 08:27:23 -0400116 .get = nfsd_inject_print_delegations,
117 .set_val = nfsd_inject_forget_delegations,
118 .set_clnt = nfsd_inject_forget_client_delegations,
Jeff Laytonc96223d2014-07-30 08:27:16 -0400119 },
120 {
121 .file = "recall_delegations",
Jeff Layton98d5c7c2014-07-30 08:27:23 -0400122 .get = nfsd_inject_print_delegations,
123 .set_val = nfsd_inject_recall_delegations,
124 .set_clnt = nfsd_inject_recall_client_delegations,
Jeff Laytonc96223d2014-07-30 08:27:16 -0400125 },
126};
127
128#define NUM_INJECT_OPS (sizeof(inject_ops)/sizeof(struct nfsd_fault_inject_op))
129
Bryan Schumaker65178db2011-11-01 13:35:21 -0400130int nfsd_fault_inject_init(void)
131{
132 unsigned int i;
133 struct nfsd_fault_inject_op *op;
Al Viro88187392012-03-20 06:00:24 -0400134 umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
Bryan Schumaker65178db2011-11-01 13:35:21 -0400135
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
147fail:
148 nfsd_fault_inject_cleanup();
149 return -ENOMEM;
150}