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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_clnt_dir;
struct rpc_clnt_iter {
struct rpc_clnt *clnt;
loff_t pos;
};
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_iter *iter = f->private;
loff_t pos = *ppos;
struct rpc_clnt *clnt = iter->clnt;
struct rpc_task *task;
iter->pos = pos + 1;
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_iter *iter = f->private;
struct rpc_clnt *clnt = iter->clnt;
struct rpc_task *task = v;
struct list_head *next = task->tk_task.next;
++iter->pos;
++*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_iter *iter = f->private;
struct rpc_clnt *clnt = iter->clnt;
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_private(filp, &tasks_seq_operations,
sizeof(struct rpc_clnt_iter));
if (!ret) {
struct seq_file *seq = filp->private_data;
struct rpc_clnt_iter *iter = seq->private;
iter->clnt = inode->i_private;
if (!atomic_inc_not_zero(&iter->clnt->cl_count)) {
seq_release_private(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_iter *iter = seq->private;
rpc_release_client(iter->clnt);
return seq_release_private(inode, filp);
}
static const struct file_operations tasks_fops = {
.owner = THIS_MODULE,
.open = tasks_open,
.read = seq_read,
.llseek = seq_lseek,
.release = tasks_release,
};
int
rpc_clnt_debugfs_register(struct rpc_clnt *clnt)
{
int len;
char name[9]; /* 8 for hex digits + NULL terminator */
/* Already registered? */
if (clnt->cl_debugfs)
return 0;
len = snprintf(name, sizeof(name), "%x", clnt->cl_clid);
if (len >= sizeof(name))
return -EINVAL;
/* make the per-client dir */
clnt->cl_debugfs = debugfs_create_dir(name, rpc_clnt_dir);
if (!clnt->cl_debugfs)
return -ENOMEM;
/* make tasks file */
if (!debugfs_create_file("tasks", S_IFREG | S_IRUSR, clnt->cl_debugfs,
clnt, &tasks_fops)) {
debugfs_remove_recursive(clnt->cl_debugfs);
clnt->cl_debugfs = NULL;
return -ENOMEM;
}
return 0;
}
void
rpc_clnt_debugfs_unregister(struct rpc_clnt *clnt)
{
debugfs_remove_recursive(clnt->cl_debugfs);
clnt->cl_debugfs = NULL;
}
void __exit
sunrpc_debugfs_exit(void)
{
debugfs_remove_recursive(topdir);
}
int __init
sunrpc_debugfs_init(void)
{
topdir = debugfs_create_dir("sunrpc", NULL);
if (!topdir)
goto out;
rpc_clnt_dir = debugfs_create_dir("rpc_clnt", topdir);
if (!rpc_clnt_dir)
goto out_remove;
return 0;
out_remove:
debugfs_remove_recursive(topdir);
topdir = NULL;
out:
return -ENOMEM;
}
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