v4.19.13 snapshot.
diff --git a/net/sunrpc/debugfs.c b/net/sunrpc/debugfs.c
new file mode 100644
index 0000000..45a0333
--- /dev/null
+++ b/net/sunrpc/debugfs.c
@@ -0,0 +1,362 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * debugfs interface for sunrpc
+ *
+ * (c) 2014 Jeff Layton <jlayton@primarydata.com>
+ */
+
+#include <linux/debugfs.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/clnt.h>
+#include "netns.h"
+
+static struct dentry *topdir;
+static struct dentry *rpc_fault_dir;
+static struct dentry *rpc_clnt_dir;
+static struct dentry *rpc_xprt_dir;
+
+unsigned int rpc_inject_disconnect;
+
+static int
+tasks_show(struct seq_file *f, void *v)
+{
+ u32 xid = 0;
+ struct rpc_task *task = v;
+ struct rpc_clnt *clnt = task->tk_client;
+ const char *rpc_waitq = "none";
+
+ if (RPC_IS_QUEUED(task))
+ rpc_waitq = rpc_qname(task->tk_waitqueue);
+
+ if (task->tk_rqstp)
+ xid = be32_to_cpu(task->tk_rqstp->rq_xid);
+
+ seq_printf(f, "%5u %04x %6d 0x%x 0x%x %8ld %ps %sv%u %s a:%ps q:%s\n",
+ task->tk_pid, task->tk_flags, task->tk_status,
+ clnt->cl_clid, xid, task->tk_timeout, task->tk_ops,
+ clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task),
+ task->tk_action, rpc_waitq);
+ return 0;
+}
+
+static void *
+tasks_start(struct seq_file *f, loff_t *ppos)
+ __acquires(&clnt->cl_lock)
+{
+ struct rpc_clnt *clnt = f->private;
+ loff_t pos = *ppos;
+ struct rpc_task *task;
+
+ spin_lock(&clnt->cl_lock);
+ list_for_each_entry(task, &clnt->cl_tasks, tk_task)
+ if (pos-- == 0)
+ return task;
+ return NULL;
+}
+
+static void *
+tasks_next(struct seq_file *f, void *v, loff_t *pos)
+{
+ struct rpc_clnt *clnt = f->private;
+ struct rpc_task *task = v;
+ struct list_head *next = task->tk_task.next;
+
+ ++*pos;
+
+ /* If there's another task on list, return it */
+ if (next == &clnt->cl_tasks)
+ return NULL;
+ return list_entry(next, struct rpc_task, tk_task);
+}
+
+static void
+tasks_stop(struct seq_file *f, void *v)
+ __releases(&clnt->cl_lock)
+{
+ struct rpc_clnt *clnt = f->private;
+ spin_unlock(&clnt->cl_lock);
+}
+
+static const struct seq_operations tasks_seq_operations = {
+ .start = tasks_start,
+ .next = tasks_next,
+ .stop = tasks_stop,
+ .show = tasks_show,
+};
+
+static int tasks_open(struct inode *inode, struct file *filp)
+{
+ int ret = seq_open(filp, &tasks_seq_operations);
+ if (!ret) {
+ struct seq_file *seq = filp->private_data;
+ struct rpc_clnt *clnt = seq->private = inode->i_private;
+
+ if (!atomic_inc_not_zero(&clnt->cl_count)) {
+ seq_release(inode, filp);
+ ret = -EINVAL;
+ }
+ }
+
+ return ret;
+}
+
+static int
+tasks_release(struct inode *inode, struct file *filp)
+{
+ struct seq_file *seq = filp->private_data;
+ struct rpc_clnt *clnt = seq->private;
+
+ rpc_release_client(clnt);
+ return seq_release(inode, filp);
+}
+
+static const struct file_operations tasks_fops = {
+ .owner = THIS_MODULE,
+ .open = tasks_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = tasks_release,
+};
+
+void
+rpc_clnt_debugfs_register(struct rpc_clnt *clnt)
+{
+ int len;
+ char name[24]; /* enough for "../../rpc_xprt/ + 8 hex digits + NULL */
+ struct rpc_xprt *xprt;
+
+ /* Already registered? */
+ if (clnt->cl_debugfs || !rpc_clnt_dir)
+ return;
+
+ len = snprintf(name, sizeof(name), "%x", clnt->cl_clid);
+ if (len >= sizeof(name))
+ return;
+
+ /* make the per-client dir */
+ clnt->cl_debugfs = debugfs_create_dir(name, rpc_clnt_dir);
+ if (!clnt->cl_debugfs)
+ return;
+
+ /* make tasks file */
+ if (!debugfs_create_file("tasks", S_IFREG | 0400, clnt->cl_debugfs,
+ clnt, &tasks_fops))
+ goto out_err;
+
+ rcu_read_lock();
+ xprt = rcu_dereference(clnt->cl_xprt);
+ /* no "debugfs" dentry? Don't bother with the symlink. */
+ if (!xprt->debugfs) {
+ rcu_read_unlock();
+ return;
+ }
+ len = snprintf(name, sizeof(name), "../../rpc_xprt/%s",
+ xprt->debugfs->d_name.name);
+ rcu_read_unlock();
+
+ if (len >= sizeof(name))
+ goto out_err;
+
+ if (!debugfs_create_symlink("xprt", clnt->cl_debugfs, name))
+ goto out_err;
+
+ return;
+out_err:
+ debugfs_remove_recursive(clnt->cl_debugfs);
+ clnt->cl_debugfs = NULL;
+}
+
+void
+rpc_clnt_debugfs_unregister(struct rpc_clnt *clnt)
+{
+ debugfs_remove_recursive(clnt->cl_debugfs);
+ clnt->cl_debugfs = NULL;
+}
+
+static int
+xprt_info_show(struct seq_file *f, void *v)
+{
+ struct rpc_xprt *xprt = f->private;
+
+ seq_printf(f, "netid: %s\n", xprt->address_strings[RPC_DISPLAY_NETID]);
+ seq_printf(f, "addr: %s\n", xprt->address_strings[RPC_DISPLAY_ADDR]);
+ seq_printf(f, "port: %s\n", xprt->address_strings[RPC_DISPLAY_PORT]);
+ seq_printf(f, "state: 0x%lx\n", xprt->state);
+ return 0;
+}
+
+static int
+xprt_info_open(struct inode *inode, struct file *filp)
+{
+ int ret;
+ struct rpc_xprt *xprt = inode->i_private;
+
+ ret = single_open(filp, xprt_info_show, xprt);
+
+ if (!ret) {
+ if (!xprt_get(xprt)) {
+ single_release(inode, filp);
+ ret = -EINVAL;
+ }
+ }
+ return ret;
+}
+
+static int
+xprt_info_release(struct inode *inode, struct file *filp)
+{
+ struct rpc_xprt *xprt = inode->i_private;
+
+ xprt_put(xprt);
+ return single_release(inode, filp);
+}
+
+static const struct file_operations xprt_info_fops = {
+ .owner = THIS_MODULE,
+ .open = xprt_info_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = xprt_info_release,
+};
+
+void
+rpc_xprt_debugfs_register(struct rpc_xprt *xprt)
+{
+ int len, id;
+ static atomic_t cur_id;
+ char name[9]; /* 8 hex digits + NULL term */
+
+ if (!rpc_xprt_dir)
+ return;
+
+ id = (unsigned int)atomic_inc_return(&cur_id);
+
+ len = snprintf(name, sizeof(name), "%x", id);
+ if (len >= sizeof(name))
+ return;
+
+ /* make the per-client dir */
+ xprt->debugfs = debugfs_create_dir(name, rpc_xprt_dir);
+ if (!xprt->debugfs)
+ return;
+
+ /* make tasks file */
+ if (!debugfs_create_file("info", S_IFREG | 0400, xprt->debugfs,
+ xprt, &xprt_info_fops)) {
+ debugfs_remove_recursive(xprt->debugfs);
+ xprt->debugfs = NULL;
+ }
+
+ atomic_set(&xprt->inject_disconnect, rpc_inject_disconnect);
+}
+
+void
+rpc_xprt_debugfs_unregister(struct rpc_xprt *xprt)
+{
+ debugfs_remove_recursive(xprt->debugfs);
+ xprt->debugfs = NULL;
+}
+
+static int
+fault_open(struct inode *inode, struct file *filp)
+{
+ filp->private_data = kmalloc(128, GFP_KERNEL);
+ if (!filp->private_data)
+ return -ENOMEM;
+ return 0;
+}
+
+static int
+fault_release(struct inode *inode, struct file *filp)
+{
+ kfree(filp->private_data);
+ return 0;
+}
+
+static ssize_t
+fault_disconnect_read(struct file *filp, char __user *user_buf,
+ size_t len, loff_t *offset)
+{
+ char *buffer = (char *)filp->private_data;
+ size_t size;
+
+ size = sprintf(buffer, "%u\n", rpc_inject_disconnect);
+ return simple_read_from_buffer(user_buf, len, offset, buffer, size);
+}
+
+static ssize_t
+fault_disconnect_write(struct file *filp, const char __user *user_buf,
+ size_t len, loff_t *offset)
+{
+ char buffer[16];
+
+ if (len >= sizeof(buffer))
+ len = sizeof(buffer) - 1;
+ if (copy_from_user(buffer, user_buf, len))
+ return -EFAULT;
+ buffer[len] = '\0';
+ if (kstrtouint(buffer, 10, &rpc_inject_disconnect))
+ return -EINVAL;
+ return len;
+}
+
+static const struct file_operations fault_disconnect_fops = {
+ .owner = THIS_MODULE,
+ .open = fault_open,
+ .read = fault_disconnect_read,
+ .write = fault_disconnect_write,
+ .release = fault_release,
+};
+
+static struct dentry *
+inject_fault_dir(struct dentry *topdir)
+{
+ struct dentry *faultdir;
+
+ faultdir = debugfs_create_dir("inject_fault", topdir);
+ if (!faultdir)
+ return NULL;
+
+ if (!debugfs_create_file("disconnect", S_IFREG | 0400, faultdir,
+ NULL, &fault_disconnect_fops))
+ return NULL;
+
+ return faultdir;
+}
+
+void __exit
+sunrpc_debugfs_exit(void)
+{
+ debugfs_remove_recursive(topdir);
+ topdir = NULL;
+ rpc_fault_dir = NULL;
+ rpc_clnt_dir = NULL;
+ rpc_xprt_dir = NULL;
+}
+
+void __init
+sunrpc_debugfs_init(void)
+{
+ topdir = debugfs_create_dir("sunrpc", NULL);
+ if (!topdir)
+ return;
+
+ rpc_fault_dir = inject_fault_dir(topdir);
+ if (!rpc_fault_dir)
+ goto out_remove;
+
+ rpc_clnt_dir = debugfs_create_dir("rpc_clnt", topdir);
+ if (!rpc_clnt_dir)
+ goto out_remove;
+
+ rpc_xprt_dir = debugfs_create_dir("rpc_xprt", topdir);
+ if (!rpc_xprt_dir)
+ goto out_remove;
+
+ return;
+out_remove:
+ debugfs_remove_recursive(topdir);
+ topdir = NULL;
+ rpc_fault_dir = NULL;
+ rpc_clnt_dir = NULL;
+}