151 lines
3.7 KiB
C
151 lines
3.7 KiB
C
/*
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* Copyright (c) 2011 Bryan Schumaker <bjschuma@netapp.com>
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*
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* Uses debugfs to create fault injection points for client testing
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*/
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#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/debugfs.h>
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#include <linux/module.h>
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#include <linux/nsproxy.h>
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#include <linux/sunrpc/addr.h>
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#include <linux/uaccess.h>
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#include "state.h"
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#include "netns.h"
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struct nfsd_fault_inject_op {
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char *file;
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u64 (*get)(void);
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u64 (*set_val)(u64);
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u64 (*set_clnt)(struct sockaddr_storage *, size_t);
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};
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static struct dentry *debug_dir;
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static ssize_t fault_inject_read(struct file *file, char __user *buf,
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size_t len, loff_t *ppos)
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{
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static u64 val;
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char read_buf[25];
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size_t size;
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loff_t pos = *ppos;
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struct nfsd_fault_inject_op *op = file_inode(file)->i_private;
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if (!pos)
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val = op->get();
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size = scnprintf(read_buf, sizeof(read_buf), "%llu\n", val);
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return simple_read_from_buffer(buf, len, ppos, read_buf, size);
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}
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static ssize_t fault_inject_write(struct file *file, const char __user *buf,
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size_t len, loff_t *ppos)
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{
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char write_buf[INET6_ADDRSTRLEN];
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size_t size = min(sizeof(write_buf) - 1, len);
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struct net *net = current->nsproxy->net_ns;
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struct sockaddr_storage sa;
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struct nfsd_fault_inject_op *op = file_inode(file)->i_private;
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u64 val;
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char *nl;
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if (copy_from_user(write_buf, buf, size))
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return -EFAULT;
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write_buf[size] = '\0';
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/* Deal with any embedded newlines in the string */
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nl = strchr(write_buf, '\n');
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if (nl) {
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size = nl - write_buf;
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*nl = '\0';
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}
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size = rpc_pton(net, write_buf, size, (struct sockaddr *)&sa, sizeof(sa));
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if (size > 0) {
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val = op->set_clnt(&sa, size);
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if (val)
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pr_info("NFSD [%s]: Client %s had %llu state object(s)\n",
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op->file, write_buf, val);
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} else {
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val = simple_strtoll(write_buf, NULL, 0);
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if (val == 0)
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pr_info("NFSD Fault Injection: %s (all)", op->file);
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else
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pr_info("NFSD Fault Injection: %s (n = %llu)",
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op->file, val);
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val = op->set_val(val);
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pr_info("NFSD: %s: found %llu", op->file, val);
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}
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return len; /* on success, claim we got the whole input */
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}
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static const struct file_operations fops_nfsd = {
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.owner = THIS_MODULE,
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.read = fault_inject_read,
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.write = fault_inject_write,
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};
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void nfsd_fault_inject_cleanup(void)
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{
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debugfs_remove_recursive(debug_dir);
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}
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static struct nfsd_fault_inject_op inject_ops[] = {
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{
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.file = "forget_clients",
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.get = nfsd_inject_print_clients,
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.set_val = nfsd_inject_forget_clients,
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.set_clnt = nfsd_inject_forget_client,
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},
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{
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.file = "forget_locks",
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.get = nfsd_inject_print_locks,
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.set_val = nfsd_inject_forget_locks,
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.set_clnt = nfsd_inject_forget_client_locks,
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},
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{
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.file = "forget_openowners",
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.get = nfsd_inject_print_openowners,
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.set_val = nfsd_inject_forget_openowners,
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.set_clnt = nfsd_inject_forget_client_openowners,
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},
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{
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.file = "forget_delegations",
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.get = nfsd_inject_print_delegations,
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.set_val = nfsd_inject_forget_delegations,
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.set_clnt = nfsd_inject_forget_client_delegations,
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},
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{
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.file = "recall_delegations",
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.get = nfsd_inject_print_delegations,
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.set_val = nfsd_inject_recall_delegations,
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.set_clnt = nfsd_inject_recall_client_delegations,
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},
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};
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#define NUM_INJECT_OPS (sizeof(inject_ops)/sizeof(struct nfsd_fault_inject_op))
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int nfsd_fault_inject_init(void)
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{
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unsigned int i;
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struct nfsd_fault_inject_op *op;
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umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
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debug_dir = debugfs_create_dir("nfsd", NULL);
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if (!debug_dir)
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goto fail;
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for (i = 0; i < NUM_INJECT_OPS; i++) {
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op = &inject_ops[i];
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if (!debugfs_create_file(op->file, mode, debug_dir, op, &fops_nfsd))
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goto fail;
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}
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return 0;
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fail:
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nfsd_fault_inject_cleanup();
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return -ENOMEM;
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}
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