/** * 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; }