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