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_clnt_dir; 15 static struct dentry *rpc_xprt_dir; 16 17 unsigned int rpc_inject_disconnect; 18 19 static int 20 tasks_show(struct seq_file *f, void *v) 21 { 22 u32 xid = 0; 23 struct rpc_task *task = v; 24 struct rpc_clnt *clnt = task->tk_client; 25 const char *rpc_waitq = "none"; 26 27 if (RPC_IS_QUEUED(task)) 28 rpc_waitq = rpc_qname(task->tk_waitqueue); 29 30 if (task->tk_rqstp) 31 xid = be32_to_cpu(task->tk_rqstp->rq_xid); 32 33 seq_printf(f, "%5u %04x %6d 0x%x 0x%x %8ld %ps %sv%u %s a:%ps q:%s\n", 34 task->tk_pid, task->tk_flags, task->tk_status, 35 clnt->cl_clid, xid, rpc_task_timeout(task), task->tk_ops, 36 clnt->cl_program->name, clnt->cl_vers, rpc_proc_name(task), 37 task->tk_action, rpc_waitq); 38 return 0; 39 } 40 41 static void * 42 tasks_start(struct seq_file *f, loff_t *ppos) 43 __acquires(&clnt->cl_lock) 44 { 45 struct rpc_clnt *clnt = f->private; 46 loff_t pos = *ppos; 47 struct rpc_task *task; 48 49 spin_lock(&clnt->cl_lock); 50 list_for_each_entry(task, &clnt->cl_tasks, tk_task) 51 if (pos-- == 0) 52 return task; 53 return NULL; 54 } 55 56 static void * 57 tasks_next(struct seq_file *f, void *v, loff_t *pos) 58 { 59 struct rpc_clnt *clnt = f->private; 60 struct rpc_task *task = v; 61 struct list_head *next = task->tk_task.next; 62 63 ++*pos; 64 65 /* If there's another task on list, return it */ 66 if (next == &clnt->cl_tasks) 67 return NULL; 68 return list_entry(next, struct rpc_task, tk_task); 69 } 70 71 static void 72 tasks_stop(struct seq_file *f, void *v) 73 __releases(&clnt->cl_lock) 74 { 75 struct rpc_clnt *clnt = f->private; 76 spin_unlock(&clnt->cl_lock); 77 } 78 79 static const struct seq_operations tasks_seq_operations = { 80 .start = tasks_start, 81 .next = tasks_next, 82 .stop = tasks_stop, 83 .show = tasks_show, 84 }; 85 86 static int tasks_open(struct inode *inode, struct file *filp) 87 { 88 int ret = seq_open(filp, &tasks_seq_operations); 89 if (!ret) { 90 struct seq_file *seq = filp->private_data; 91 struct rpc_clnt *clnt = seq->private = inode->i_private; 92 93 if (!atomic_inc_not_zero(&clnt->cl_count)) { 94 seq_release(inode, filp); 95 ret = -EINVAL; 96 } 97 } 98 99 return ret; 100 } 101 102 static int 103 tasks_release(struct inode *inode, struct file *filp) 104 { 105 struct seq_file *seq = filp->private_data; 106 struct rpc_clnt *clnt = seq->private; 107 108 rpc_release_client(clnt); 109 return seq_release(inode, filp); 110 } 111 112 static const struct file_operations tasks_fops = { 113 .owner = THIS_MODULE, 114 .open = tasks_open, 115 .read = seq_read, 116 .llseek = seq_lseek, 117 .release = tasks_release, 118 }; 119 120 static int do_xprt_debugfs(struct rpc_clnt *clnt, struct rpc_xprt *xprt, void *numv) 121 { 122 int len; 123 char name[24]; /* enough for "../../rpc_xprt/ + 8 hex digits + NULL */ 124 char link[9]; /* enough for 8 hex digits + NULL */ 125 int *nump = numv; 126 127 if (IS_ERR_OR_NULL(xprt->debugfs)) 128 return 0; 129 len = snprintf(name, sizeof(name), "../../rpc_xprt/%s", 130 xprt->debugfs->d_name.name); 131 if (len >= sizeof(name)) 132 return -1; 133 if (*nump == 0) 134 strcpy(link, "xprt"); 135 else { 136 len = snprintf(link, sizeof(link), "xprt%d", *nump); 137 if (len >= sizeof(link)) 138 return -1; 139 } 140 debugfs_create_symlink(link, clnt->cl_debugfs, name); 141 (*nump)++; 142 return 0; 143 } 144 145 void 146 rpc_clnt_debugfs_register(struct rpc_clnt *clnt) 147 { 148 int len; 149 char name[9]; /* enough for 8 hex digits + NULL */ 150 int xprtnum = 0; 151 152 len = snprintf(name, sizeof(name), "%x", clnt->cl_clid); 153 if (len >= sizeof(name)) 154 return; 155 156 /* make the per-client dir */ 157 clnt->cl_debugfs = debugfs_create_dir(name, rpc_clnt_dir); 158 159 /* make tasks file */ 160 debugfs_create_file("tasks", S_IFREG | 0400, clnt->cl_debugfs, clnt, 161 &tasks_fops); 162 163 rpc_clnt_iterate_for_each_xprt(clnt, do_xprt_debugfs, &xprtnum); 164 } 165 166 void 167 rpc_clnt_debugfs_unregister(struct rpc_clnt *clnt) 168 { 169 debugfs_remove_recursive(clnt->cl_debugfs); 170 clnt->cl_debugfs = NULL; 171 } 172 173 static int 174 xprt_info_show(struct seq_file *f, void *v) 175 { 176 struct rpc_xprt *xprt = f->private; 177 178 seq_printf(f, "netid: %s\n", xprt->address_strings[RPC_DISPLAY_NETID]); 179 seq_printf(f, "addr: %s\n", xprt->address_strings[RPC_DISPLAY_ADDR]); 180 seq_printf(f, "port: %s\n", xprt->address_strings[RPC_DISPLAY_PORT]); 181 seq_printf(f, "state: 0x%lx\n", xprt->state); 182 return 0; 183 } 184 185 static int 186 xprt_info_open(struct inode *inode, struct file *filp) 187 { 188 int ret; 189 struct rpc_xprt *xprt = inode->i_private; 190 191 ret = single_open(filp, xprt_info_show, xprt); 192 193 if (!ret) { 194 if (!xprt_get(xprt)) { 195 single_release(inode, filp); 196 ret = -EINVAL; 197 } 198 } 199 return ret; 200 } 201 202 static int 203 xprt_info_release(struct inode *inode, struct file *filp) 204 { 205 struct rpc_xprt *xprt = inode->i_private; 206 207 xprt_put(xprt); 208 return single_release(inode, filp); 209 } 210 211 static const struct file_operations xprt_info_fops = { 212 .owner = THIS_MODULE, 213 .open = xprt_info_open, 214 .read = seq_read, 215 .llseek = seq_lseek, 216 .release = xprt_info_release, 217 }; 218 219 void 220 rpc_xprt_debugfs_register(struct rpc_xprt *xprt) 221 { 222 int len, id; 223 static atomic_t cur_id; 224 char name[9]; /* 8 hex digits + NULL term */ 225 226 id = (unsigned int)atomic_inc_return(&cur_id); 227 228 len = snprintf(name, sizeof(name), "%x", id); 229 if (len >= sizeof(name)) 230 return; 231 232 /* make the per-client dir */ 233 xprt->debugfs = debugfs_create_dir(name, rpc_xprt_dir); 234 235 /* make tasks file */ 236 debugfs_create_file("info", S_IFREG | 0400, xprt->debugfs, xprt, 237 &xprt_info_fops); 238 239 atomic_set(&xprt->inject_disconnect, rpc_inject_disconnect); 240 } 241 242 void 243 rpc_xprt_debugfs_unregister(struct rpc_xprt *xprt) 244 { 245 debugfs_remove_recursive(xprt->debugfs); 246 xprt->debugfs = NULL; 247 } 248 249 static int 250 fault_open(struct inode *inode, struct file *filp) 251 { 252 filp->private_data = kmalloc(128, GFP_KERNEL); 253 if (!filp->private_data) 254 return -ENOMEM; 255 return 0; 256 } 257 258 static int 259 fault_release(struct inode *inode, struct file *filp) 260 { 261 kfree(filp->private_data); 262 return 0; 263 } 264 265 static ssize_t 266 fault_disconnect_read(struct file *filp, char __user *user_buf, 267 size_t len, loff_t *offset) 268 { 269 char *buffer = (char *)filp->private_data; 270 size_t size; 271 272 size = sprintf(buffer, "%u\n", rpc_inject_disconnect); 273 return simple_read_from_buffer(user_buf, len, offset, buffer, size); 274 } 275 276 static ssize_t 277 fault_disconnect_write(struct file *filp, const char __user *user_buf, 278 size_t len, loff_t *offset) 279 { 280 char buffer[16]; 281 282 if (len >= sizeof(buffer)) 283 len = sizeof(buffer) - 1; 284 if (copy_from_user(buffer, user_buf, len)) 285 return -EFAULT; 286 buffer[len] = '\0'; 287 if (kstrtouint(buffer, 10, &rpc_inject_disconnect)) 288 return -EINVAL; 289 return len; 290 } 291 292 static const struct file_operations fault_disconnect_fops = { 293 .owner = THIS_MODULE, 294 .open = fault_open, 295 .read = fault_disconnect_read, 296 .write = fault_disconnect_write, 297 .release = fault_release, 298 }; 299 300 void __exit 301 sunrpc_debugfs_exit(void) 302 { 303 debugfs_remove_recursive(topdir); 304 topdir = NULL; 305 rpc_clnt_dir = NULL; 306 rpc_xprt_dir = NULL; 307 } 308 309 void __init 310 sunrpc_debugfs_init(void) 311 { 312 struct dentry *rpc_fault_dir; 313 314 topdir = debugfs_create_dir("sunrpc", NULL); 315 316 rpc_clnt_dir = debugfs_create_dir("rpc_clnt", topdir); 317 318 rpc_xprt_dir = debugfs_create_dir("rpc_xprt", topdir); 319 320 rpc_fault_dir = debugfs_create_dir("inject_fault", topdir); 321 322 debugfs_create_file("disconnect", S_IFREG | 0400, rpc_fault_dir, NULL, 323 &fault_disconnect_fops); 324 } 325