linux/net/sunrpc/debugfs.c

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/**
* 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 | S_IRUSR, 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 | S_IRUSR, 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 | S_IRUSR, 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;
}