1 // SPDX-License-Identifier: GPL-2.0 2 /** 3 * debugfs interface for sunrpc 4 * 5 * (c) 2014 Jeff Layton <jlayton@primarydata.com> 6 */ 7 8 #include <linux/debugfs.h> 9 #include <linux/sunrpc/sched.h> 10 #include <linux/sunrpc/clnt.h> 11 #include "netns.h" 12 13 static struct dentry *topdir; 14 static struct dentry *rpc_fault_dir; 15 static struct dentry *rpc_clnt_dir; 16 static struct dentry *rpc_xprt_dir; 17 18 unsigned int rpc_inject_disconnect; 19 20 static int 21 tasks_show(struct seq_file *f, void *v) 22 { 23 u32 xid = 0; 24 struct rpc_task *task = v; 25 struct rpc_clnt *clnt = task->tk_client; 26 const char *rpc_waitq = "none"; 27 28 if (RPC_IS_QUEUED(task)) 29 rpc_waitq = rpc_qname(task->tk_waitqueue); 30 31 if (task->tk_rqstp) 32 xid = be32_to_cpu(task->tk_rqstp->rq_xid); 33 34 seq_printf(f, "%5u %04x %6d 0x%x 0x%x %8ld %ps %sv%u %s a:%ps q:%s\n", 35 task->tk_pid, task->tk_flags, task->tk_status, 36 clnt->cl_clid, xid, task->tk_timeout, task->tk_ops, 37 clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task), 38 task->tk_action, rpc_waitq); 39 return 0; 40 } 41 42 static void * 43 tasks_start(struct seq_file *f, loff_t *ppos) 44 __acquires(&clnt->cl_lock) 45 { 46 struct rpc_clnt *clnt = f->private; 47 loff_t pos = *ppos; 48 struct rpc_task *task; 49 50 spin_lock(&clnt->cl_lock); 51 list_for_each_entry(task, &clnt->cl_tasks, tk_task) 52 if (pos-- == 0) 53 return task; 54 return NULL; 55 } 56 57 static void * 58 tasks_next(struct seq_file *f, void *v, loff_t *pos) 59 { 60 struct rpc_clnt *clnt = f->private; 61 struct rpc_task *task = v; 62 struct list_head *next = task->tk_task.next; 63 64 ++*pos; 65 66 /* If there's another task on list, return it */ 67 if (next == &clnt->cl_tasks) 68 return NULL; 69 return list_entry(next, struct rpc_task, tk_task); 70 } 71 72 static void 73 tasks_stop(struct seq_file *f, void *v) 74 __releases(&clnt->cl_lock) 75 { 76 struct rpc_clnt *clnt = f->private; 77 spin_unlock(&clnt->cl_lock); 78 } 79 80 static const struct seq_operations tasks_seq_operations = { 81 .start = tasks_start, 82 .next = tasks_next, 83 .stop = tasks_stop, 84 .show = tasks_show, 85 }; 86 87 static int tasks_open(struct inode *inode, struct file *filp) 88 { 89 int ret = seq_open(filp, &tasks_seq_operations); 90 if (!ret) { 91 struct seq_file *seq = filp->private_data; 92 struct rpc_clnt *clnt = seq->private = inode->i_private; 93 94 if (!atomic_inc_not_zero(&clnt->cl_count)) { 95 seq_release(inode, filp); 96 ret = -EINVAL; 97 } 98 } 99 100 return ret; 101 } 102 103 static int 104 tasks_release(struct inode *inode, struct file *filp) 105 { 106 struct seq_file *seq = filp->private_data; 107 struct rpc_clnt *clnt = seq->private; 108 109 rpc_release_client(clnt); 110 return seq_release(inode, filp); 111 } 112 113 static const struct file_operations tasks_fops = { 114 .owner = THIS_MODULE, 115 .open = tasks_open, 116 .read = seq_read, 117 .llseek = seq_lseek, 118 .release = tasks_release, 119 }; 120 121 void 122 rpc_clnt_debugfs_register(struct rpc_clnt *clnt) 123 { 124 int len; 125 char name[24]; /* enough for "../../rpc_xprt/ + 8 hex digits + NULL */ 126 struct rpc_xprt *xprt; 127 128 /* Already registered? */ 129 if (clnt->cl_debugfs || !rpc_clnt_dir) 130 return; 131 132 len = snprintf(name, sizeof(name), "%x", clnt->cl_clid); 133 if (len >= sizeof(name)) 134 return; 135 136 /* make the per-client dir */ 137 clnt->cl_debugfs = debugfs_create_dir(name, rpc_clnt_dir); 138 if (!clnt->cl_debugfs) 139 return; 140 141 /* make tasks file */ 142 if (!debugfs_create_file("tasks", S_IFREG | S_IRUSR, clnt->cl_debugfs, 143 clnt, &tasks_fops)) 144 goto out_err; 145 146 rcu_read_lock(); 147 xprt = rcu_dereference(clnt->cl_xprt); 148 /* no "debugfs" dentry? Don't bother with the symlink. */ 149 if (!xprt->debugfs) { 150 rcu_read_unlock(); 151 return; 152 } 153 len = snprintf(name, sizeof(name), "../../rpc_xprt/%s", 154 xprt->debugfs->d_name.name); 155 rcu_read_unlock(); 156 157 if (len >= sizeof(name)) 158 goto out_err; 159 160 if (!debugfs_create_symlink("xprt", clnt->cl_debugfs, name)) 161 goto out_err; 162 163 return; 164 out_err: 165 debugfs_remove_recursive(clnt->cl_debugfs); 166 clnt->cl_debugfs = NULL; 167 } 168 169 void 170 rpc_clnt_debugfs_unregister(struct rpc_clnt *clnt) 171 { 172 debugfs_remove_recursive(clnt->cl_debugfs); 173 clnt->cl_debugfs = NULL; 174 } 175 176 static int 177 xprt_info_show(struct seq_file *f, void *v) 178 { 179 struct rpc_xprt *xprt = f->private; 180 181 seq_printf(f, "netid: %s\n", xprt->address_strings[RPC_DISPLAY_NETID]); 182 seq_printf(f, "addr: %s\n", xprt->address_strings[RPC_DISPLAY_ADDR]); 183 seq_printf(f, "port: %s\n", xprt->address_strings[RPC_DISPLAY_PORT]); 184 seq_printf(f, "state: 0x%lx\n", xprt->state); 185 return 0; 186 } 187 188 static int 189 xprt_info_open(struct inode *inode, struct file *filp) 190 { 191 int ret; 192 struct rpc_xprt *xprt = inode->i_private; 193 194 ret = single_open(filp, xprt_info_show, xprt); 195 196 if (!ret) { 197 if (!xprt_get(xprt)) { 198 single_release(inode, filp); 199 ret = -EINVAL; 200 } 201 } 202 return ret; 203 } 204 205 static int 206 xprt_info_release(struct inode *inode, struct file *filp) 207 { 208 struct rpc_xprt *xprt = inode->i_private; 209 210 xprt_put(xprt); 211 return single_release(inode, filp); 212 } 213 214 static const struct file_operations xprt_info_fops = { 215 .owner = THIS_MODULE, 216 .open = xprt_info_open, 217 .read = seq_read, 218 .llseek = seq_lseek, 219 .release = xprt_info_release, 220 }; 221 222 void 223 rpc_xprt_debugfs_register(struct rpc_xprt *xprt) 224 { 225 int len, id; 226 static atomic_t cur_id; 227 char name[9]; /* 8 hex digits + NULL term */ 228 229 if (!rpc_xprt_dir) 230 return; 231 232 id = (unsigned int)atomic_inc_return(&cur_id); 233 234 len = snprintf(name, sizeof(name), "%x", id); 235 if (len >= sizeof(name)) 236 return; 237 238 /* make the per-client dir */ 239 xprt->debugfs = debugfs_create_dir(name, rpc_xprt_dir); 240 if (!xprt->debugfs) 241 return; 242 243 /* make tasks file */ 244 if (!debugfs_create_file("info", S_IFREG | S_IRUSR, xprt->debugfs, 245 xprt, &xprt_info_fops)) { 246 debugfs_remove_recursive(xprt->debugfs); 247 xprt->debugfs = NULL; 248 } 249 250 atomic_set(&xprt->inject_disconnect, rpc_inject_disconnect); 251 } 252 253 void 254 rpc_xprt_debugfs_unregister(struct rpc_xprt *xprt) 255 { 256 debugfs_remove_recursive(xprt->debugfs); 257 xprt->debugfs = NULL; 258 } 259 260 static int 261 fault_open(struct inode *inode, struct file *filp) 262 { 263 filp->private_data = kmalloc(128, GFP_KERNEL); 264 if (!filp->private_data) 265 return -ENOMEM; 266 return 0; 267 } 268 269 static int 270 fault_release(struct inode *inode, struct file *filp) 271 { 272 kfree(filp->private_data); 273 return 0; 274 } 275 276 static ssize_t 277 fault_disconnect_read(struct file *filp, char __user *user_buf, 278 size_t len, loff_t *offset) 279 { 280 char *buffer = (char *)filp->private_data; 281 size_t size; 282 283 size = sprintf(buffer, "%u\n", rpc_inject_disconnect); 284 return simple_read_from_buffer(user_buf, len, offset, buffer, size); 285 } 286 287 static ssize_t 288 fault_disconnect_write(struct file *filp, const char __user *user_buf, 289 size_t len, loff_t *offset) 290 { 291 char buffer[16]; 292 293 if (len >= sizeof(buffer)) 294 len = sizeof(buffer) - 1; 295 if (copy_from_user(buffer, user_buf, len)) 296 return -EFAULT; 297 buffer[len] = '\0'; 298 if (kstrtouint(buffer, 10, &rpc_inject_disconnect)) 299 return -EINVAL; 300 return len; 301 } 302 303 static const struct file_operations fault_disconnect_fops = { 304 .owner = THIS_MODULE, 305 .open = fault_open, 306 .read = fault_disconnect_read, 307 .write = fault_disconnect_write, 308 .release = fault_release, 309 }; 310 311 static struct dentry * 312 inject_fault_dir(struct dentry *topdir) 313 { 314 struct dentry *faultdir; 315 316 faultdir = debugfs_create_dir("inject_fault", topdir); 317 if (!faultdir) 318 return NULL; 319 320 if (!debugfs_create_file("disconnect", S_IFREG | S_IRUSR, faultdir, 321 NULL, &fault_disconnect_fops)) 322 return NULL; 323 324 return faultdir; 325 } 326 327 void __exit 328 sunrpc_debugfs_exit(void) 329 { 330 debugfs_remove_recursive(topdir); 331 topdir = NULL; 332 rpc_fault_dir = NULL; 333 rpc_clnt_dir = NULL; 334 rpc_xprt_dir = NULL; 335 } 336 337 void __init 338 sunrpc_debugfs_init(void) 339 { 340 topdir = debugfs_create_dir("sunrpc", NULL); 341 if (!topdir) 342 return; 343 344 rpc_fault_dir = inject_fault_dir(topdir); 345 if (!rpc_fault_dir) 346 goto out_remove; 347 348 rpc_clnt_dir = debugfs_create_dir("rpc_clnt", topdir); 349 if (!rpc_clnt_dir) 350 goto out_remove; 351 352 rpc_xprt_dir = debugfs_create_dir("rpc_xprt", topdir); 353 if (!rpc_xprt_dir) 354 goto out_remove; 355 356 return; 357 out_remove: 358 debugfs_remove_recursive(topdir); 359 topdir = NULL; 360 rpc_fault_dir = NULL; 361 rpc_clnt_dir = NULL; 362 } 363