Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / nfsd / fault_inject.c

diff --git a/kernel/fs/nfsd/fault_inject.c b/kernel/fs/nfsd/fault_inject.c
new file mode 100644 (file)
index 0000000..c16bf5a
--- /dev/null
+++ b/kernel/fs/nfsd/fault_inject.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2011 Bryan Schumaker <bjschuma@netapp.com>
+ *
+ * Uses debugfs to create fault injection points for client testing
+ */
+
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/debugfs.h>
+#include <linux/module.h>
+#include <linux/nsproxy.h>
+#include <linux/sunrpc/addr.h>
+#include <asm/uaccess.h>
+
+#include "state.h"
+#include "netns.h"
+
+struct nfsd_fault_inject_op {
+       char *file;
+       u64 (*get)(void);
+       u64 (*set_val)(u64);
+       u64 (*set_clnt)(struct sockaddr_storage *, size_t);
+};
+
+static struct dentry *debug_dir;
+
+static ssize_t fault_inject_read(struct file *file, char __user *buf,
+                                size_t len, loff_t *ppos)
+{
+       static u64 val;
+       char read_buf[25];
+       size_t size;
+       loff_t pos = *ppos;
+       struct nfsd_fault_inject_op *op = file_inode(file)->i_private;
+
+       if (!pos)
+               val = op->get();
+       size = scnprintf(read_buf, sizeof(read_buf), "%llu\n", val);
+
+       return simple_read_from_buffer(buf, len, ppos, read_buf, size);
+}
+
+static ssize_t fault_inject_write(struct file *file, const char __user *buf,
+                                 size_t len, loff_t *ppos)
+{
+       char write_buf[INET6_ADDRSTRLEN];
+       size_t size = min(sizeof(write_buf) - 1, len);
+       struct net *net = current->nsproxy->net_ns;
+       struct sockaddr_storage sa;
+       struct nfsd_fault_inject_op *op = file_inode(file)->i_private;
+       u64 val;
+       char *nl;
+
+       if (copy_from_user(write_buf, buf, size))
+               return -EFAULT;
+       write_buf[size] = '\0';
+
+       /* Deal with any embedded newlines in the string */
+       nl = strchr(write_buf, '\n');
+       if (nl) {
+               size = nl - write_buf;
+               *nl = '\0';
+       }
+
+       size = rpc_pton(net, write_buf, size, (struct sockaddr *)&sa, sizeof(sa));
+       if (size > 0) {
+               val = op->set_clnt(&sa, size);
+               if (val)
+                       pr_info("NFSD [%s]: Client %s had %llu state object(s)\n",
+                               op->file, write_buf, val);
+       } else {
+               val = simple_strtoll(write_buf, NULL, 0);
+               if (val == 0)
+                       pr_info("NFSD Fault Injection: %s (all)", op->file);
+               else
+                       pr_info("NFSD Fault Injection: %s (n = %llu)",
+                               op->file, val);
+               val = op->set_val(val);
+               pr_info("NFSD: %s: found %llu", op->file, val);
+       }
+       return len; /* on success, claim we got the whole input */
+}
+
+static const struct file_operations fops_nfsd = {
+       .owner   = THIS_MODULE,
+       .read    = fault_inject_read,
+       .write   = fault_inject_write,
+};
+
+void nfsd_fault_inject_cleanup(void)
+{
+       debugfs_remove_recursive(debug_dir);
+}
+
+static struct nfsd_fault_inject_op inject_ops[] = {
+       {
+               .file     = "forget_clients",
+               .get      = nfsd_inject_print_clients,
+               .set_val  = nfsd_inject_forget_clients,
+               .set_clnt = nfsd_inject_forget_client,
+       },
+       {
+               .file     = "forget_locks",
+               .get      = nfsd_inject_print_locks,
+               .set_val  = nfsd_inject_forget_locks,
+               .set_clnt = nfsd_inject_forget_client_locks,
+       },
+       {
+               .file     = "forget_openowners",
+               .get      = nfsd_inject_print_openowners,
+               .set_val  = nfsd_inject_forget_openowners,
+               .set_clnt = nfsd_inject_forget_client_openowners,
+       },
+       {
+               .file     = "forget_delegations",
+               .get      = nfsd_inject_print_delegations,
+               .set_val  = nfsd_inject_forget_delegations,
+               .set_clnt = nfsd_inject_forget_client_delegations,
+       },
+       {
+               .file     = "recall_delegations",
+               .get      = nfsd_inject_print_delegations,
+               .set_val  = nfsd_inject_recall_delegations,
+               .set_clnt = nfsd_inject_recall_client_delegations,
+       },
+};
+
+#define NUM_INJECT_OPS (sizeof(inject_ops)/sizeof(struct nfsd_fault_inject_op))
+
+int nfsd_fault_inject_init(void)
+{
+       unsigned int i;
+       struct nfsd_fault_inject_op *op;
+       umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
+
+       debug_dir = debugfs_create_dir("nfsd", NULL);
+       if (!debug_dir)
+               goto fail;
+
+       for (i = 0; i < NUM_INJECT_OPS; i++) {
+               op = &inject_ops[i];
+               if (!debugfs_create_file(op->file, mode, debug_dir, op, &fops_nfsd))
+                       goto fail;
+       }
+       return 0;
+
+fail:
+       nfsd_fault_inject_cleanup();
+       return -ENOMEM;
+}