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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d 
 kernel/fs/afs/proc.c
....@@ -1,12 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /* /proc interface for AFS
23  *
34  * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
45  * Written by David Howells (dhowells@redhat.com)
5
- *
6
- * This program is free software; you can redistribute it and/or
7
- * modify it under the terms of the GNU General Public License
8
- * as published by the Free Software Foundation; either version
9
- * 2 of the License, or (at your option) any later version.
106  */
117 
128 #include <linux/slab.h>
....@@ -16,6 +12,11 @@
1612 #include <linux/sched.h>
1713 #include <linux/uaccess.h>
1814 #include "internal.h"
15
+
16
+struct afs_vl_seq_net_private {
17
+	struct seq_net_private		seq;	/* Must be first */
18
+	struct afs_vlserver_list	*vllist;
19
+};
1920 
2021 static inline struct afs_net *afs_seq2net(struct seq_file *m)
2122 {
....@@ -32,16 +33,26 @@
3233  */
3334 static int afs_proc_cells_show(struct seq_file *m, void *v)
3435 {
35
-	struct afs_cell *cell = list_entry(v, struct afs_cell, proc_link);
36
+	struct afs_vlserver_list *vllist;
37
+	struct afs_cell *cell;
3638 
3739 	if (v == SEQ_START_TOKEN) {
3840 		/* display header on line 1 */
39
-		seq_puts(m, "USE NAME\n");
41
+		seq_puts(m, "USE ACT    TTL SV ST NAME\n");
4042 		return 0;
4143 	}
4244 
45
+	cell = list_entry(v, struct afs_cell, proc_link);
46
+	vllist = rcu_dereference(cell->vl_servers);
47
+
4348 	/* display one cell per line on subsequent lines */
44
-	seq_printf(m, "%3u %s\n", atomic_read(&cell->usage), cell->name);
49
+	seq_printf(m, "%3u %3u %6lld %2u %2u %s\n",
50
+		   atomic_read(&cell->ref),
51
+		   atomic_read(&cell->active),
52
+		   cell->dns_expiry - ktime_get_real_seconds(),
53
+		   vllist ? vllist->nr_servers : 0,
54
+		   cell->state,
55
+		   cell->name);
4556 	return 0;
4657 }
4758 
....@@ -118,7 +129,7 @@
118129 		}
119130 
120131 		if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
121
-			afs_put_cell(net, cell);
132
+			afs_unuse_cell(net, cell, afs_cell_trace_unuse_no_pin);
122133 	} else {
123134 		goto inval;
124135 	}
....@@ -144,13 +155,11 @@
144155 	struct afs_net *net;
145156 
146157 	net = afs_seq2net_single(m);
147
-	if (rcu_access_pointer(net->ws_cell)) {
148
-		rcu_read_lock();
149
-		cell = rcu_dereference(net->ws_cell);
150
-		if (cell)
151
-			seq_printf(m, "%s\n", cell->name);
152
-		rcu_read_unlock();
153
-	}
158
+	down_read(&net->cells_lock);
159
+	cell = net->ws_cell;
160
+	if (cell)
161
+		seq_printf(m, "%s\n", cell->name);
162
+	up_read(&net->cells_lock);
154163 	return 0;
155164 }
156165 
....@@ -199,18 +208,18 @@
199208  */
200209 static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
201210 {
202
-	struct afs_cell *cell = PDE_DATA(file_inode(m->file));
203
-	struct afs_volume *vol = list_entry(v, struct afs_volume, proc_link);
211
+	struct afs_volume *vol = hlist_entry(v, struct afs_volume, proc_link);
204212 
205213 	/* Display header on line 1 */
206
-	if (v == &cell->proc_volumes) {
207
-		seq_puts(m, "USE VID      TY\n");
214
+	if (v == SEQ_START_TOKEN) {
215
+		seq_puts(m, "USE VID      TY NAME\n");
208216 		return 0;
209217 	}
210218 
211
-	seq_printf(m, "%3d %08x %s\n",
219
+	seq_printf(m, "%3d %08llx %s %s\n",
212220 		   atomic_read(&vol->usage), vol->vid,
213
-		   afs_vol_types[vol->type]);
221
+		   afs_vol_types[vol->type],
222
+		   vol->name);
214223 
215224 	return 0;
216225 }
....@@ -220,8 +229,8 @@
220229 {
221230 	struct afs_cell *cell = PDE_DATA(file_inode(m->file));
222231 
223
-	read_lock(&cell->proc_lock);
224
-	return seq_list_start_head(&cell->proc_volumes, *_pos);
232
+	rcu_read_lock();
233
+	return seq_hlist_start_head_rcu(&cell->proc_volumes, *_pos);
225234 }
226235 
227236 static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v,
....@@ -229,15 +238,13 @@
229238 {
230239 	struct afs_cell *cell = PDE_DATA(file_inode(m->file));
231240 
232
-	return seq_list_next(v, &cell->proc_volumes, _pos);
241
+	return seq_hlist_next_rcu(v, &cell->proc_volumes, _pos);
233242 }
234243 
235244 static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v)
236245 	__releases(cell->proc_lock)
237246 {
238
-	struct afs_cell *cell = PDE_DATA(file_inode(m->file));
239
-
240
-	read_unlock(&cell->proc_lock);
247
+	rcu_read_unlock();
241248 }
242249 
243250 static const struct seq_operations afs_proc_cell_volumes_ops = {
....@@ -247,61 +254,107 @@
247254 	.show	= afs_proc_cell_volumes_show,
248255 };
249256 
257
+static const char *const dns_record_sources[NR__dns_record_source + 1] = {
258
+	[DNS_RECORD_UNAVAILABLE]	= "unav",
259
+	[DNS_RECORD_FROM_CONFIG]	= "cfg",
260
+	[DNS_RECORD_FROM_DNS_A]		= "A",
261
+	[DNS_RECORD_FROM_DNS_AFSDB]	= "AFSDB",
262
+	[DNS_RECORD_FROM_DNS_SRV]	= "SRV",
263
+	[DNS_RECORD_FROM_NSS]		= "nss",
264
+	[NR__dns_record_source]		= "[weird]"
265
+};
266
+
267
+static const char *const dns_lookup_statuses[NR__dns_lookup_status + 1] = {
268
+	[DNS_LOOKUP_NOT_DONE]		= "no-lookup",
269
+	[DNS_LOOKUP_GOOD]		= "good",
270
+	[DNS_LOOKUP_GOOD_WITH_BAD]	= "good/bad",
271
+	[DNS_LOOKUP_BAD]		= "bad",
272
+	[DNS_LOOKUP_GOT_NOT_FOUND]	= "not-found",
273
+	[DNS_LOOKUP_GOT_LOCAL_FAILURE]	= "local-failure",
274
+	[DNS_LOOKUP_GOT_TEMP_FAILURE]	= "temp-failure",
275
+	[DNS_LOOKUP_GOT_NS_FAILURE]	= "ns-failure",
276
+	[NR__dns_lookup_status]		= "[weird]"
277
+};
278
+
250279 /*
251280  * Display the list of Volume Location servers we're using for a cell.
252281  */
253282 static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
254283 {
255
-	struct sockaddr_rxrpc *addr = v;
284
+	const struct afs_vl_seq_net_private *priv = m->private;
285
+	const struct afs_vlserver_list *vllist = priv->vllist;
286
+	const struct afs_vlserver_entry *entry;
287
+	const struct afs_vlserver *vlserver;
288
+	const struct afs_addr_list *alist;
289
+	int i;
256290 
257
-	/* display header on line 1 */
258
-	if (v == (void *)1) {
259
-		seq_puts(m, "ADDRESS\n");
291
+	if (v == SEQ_START_TOKEN) {
292
+		seq_printf(m, "# source %s, status %s\n",
293
+			   dns_record_sources[vllist ? vllist->source : 0],
294
+			   dns_lookup_statuses[vllist ? vllist->status : 0]);
260295 		return 0;
261296 	}
262297 
263
-	/* display one cell per line on subsequent lines */
264
-	seq_printf(m, "%pISp\n", &addr->transport);
298
+	entry = v;
299
+	vlserver = entry->server;
300
+	alist = rcu_dereference(vlserver->addresses);
301
+
302
+	seq_printf(m, "%s [p=%hu w=%hu s=%s,%s]:\n",
303
+		   vlserver->name, entry->priority, entry->weight,
304
+		   dns_record_sources[alist ? alist->source : entry->source],
305
+		   dns_lookup_statuses[alist ? alist->status : entry->status]);
306
+	if (alist) {
307
+		for (i = 0; i < alist->nr_addrs; i++)
308
+			seq_printf(m, " %c %pISpc\n",
309
+				   alist->preferred == i ? '>' : '-',
310
+				   &alist->addrs[i].transport);
311
+	}
312
+	seq_printf(m, " info: fl=%lx rtt=%d\n", vlserver->flags, vlserver->rtt);
313
+	seq_printf(m, " probe: fl=%x e=%d ac=%d out=%d\n",
314
+		   vlserver->probe.flags, vlserver->probe.error,
315
+		   vlserver->probe.abort_code,
316
+		   atomic_read(&vlserver->probe_outstanding));
265317 	return 0;
266318 }
267319 
268320 static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
269321 	__acquires(rcu)
270322 {
271
-	struct afs_addr_list *alist;
323
+	struct afs_vl_seq_net_private *priv = m->private;
324
+	struct afs_vlserver_list *vllist;
272325 	struct afs_cell *cell = PDE_DATA(file_inode(m->file));
273326 	loff_t pos = *_pos;
274327 
275328 	rcu_read_lock();
276329 
277
-	alist = rcu_dereference(cell->vl_addrs);
330
+	vllist = rcu_dereference(cell->vl_servers);
331
+	priv->vllist = vllist;
278332 
279
-	/* allow for the header line */
280
-	if (!pos)
281
-		return (void *) 1;
282
-	pos--;
333
+	if (pos < 0)
334
+		*_pos = pos = 0;
335
+	if (pos == 0)
336
+		return SEQ_START_TOKEN;
283337 
284
-	if (!alist || pos >= alist->nr_addrs)
338
+	if (pos - 1 >= vllist->nr_servers)
285339 		return NULL;
286340 
287
-	return alist->addrs + pos;
341
+	return &vllist->servers[pos - 1];
288342 }
289343 
290344 static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v,
291345 					  loff_t *_pos)
292346 {
293
-	struct afs_addr_list *alist;
294
-	struct afs_cell *cell = PDE_DATA(file_inode(m->file));
347
+	struct afs_vl_seq_net_private *priv = m->private;
348
+	struct afs_vlserver_list *vllist = priv->vllist;
295349 	loff_t pos;
296350 
297
-	alist = rcu_dereference(cell->vl_addrs);
298
-
299351 	pos = *_pos;
300
-	(*_pos)++;
301
-	if (!alist || pos >= alist->nr_addrs)
352
+	pos++;
353
+	*_pos = pos;
354
+	if (!vllist || pos - 1 >= vllist->nr_servers)
302355 		return NULL;
303356 
304
-	return alist->addrs + pos;
357
+	return &vllist->servers[pos - 1];
305358 }
306359 
307360 static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v)
....@@ -327,21 +380,27 @@
327380 	int i;
328381 
329382 	if (v == SEQ_START_TOKEN) {
330
-		seq_puts(m, "UUID                                 USE ADDR\n");
383
+		seq_puts(m, "UUID                                 REF ACT\n");
331384 		return 0;
332385 	}
333386 
334387 	server = list_entry(v, struct afs_server, proc_link);
335388 	alist = rcu_dereference(server->addresses);
336
-	seq_printf(m, "%pU %3d %pISpc%s\n",
389
+	seq_printf(m, "%pU %3d %3d\n",
337390 		   &server->uuid,
338
-		   atomic_read(&server->usage),
339
-		   &alist->addrs[0].transport,
340
-		   alist->index == 0 ? "*" : "");
341
-	for (i = 1; i < alist->nr_addrs; i++)
342
-		seq_printf(m, "                                         %pISpc%s\n",
343
-			   &alist->addrs[i].transport,
344
-			   alist->index == i ? "*" : "");
391
+		   atomic_read(&server->ref),
392
+		   atomic_read(&server->active));
393
+	seq_printf(m, "  - info: fl=%lx rtt=%u brk=%x\n",
394
+		   server->flags, server->rtt, server->cb_s_break);
395
+	seq_printf(m, "  - probe: last=%d out=%d\n",
396
+		   (int)(jiffies - server->probed_at) / HZ,
397
+		   atomic_read(&server->probe_outstanding));
398
+	seq_printf(m, "  - ALIST v=%u rsp=%lx f=%lx\n",
399
+		   alist->version, alist->responded, alist->failed);
400
+	for (i = 0; i < alist->nr_addrs; i++)
401
+		seq_printf(m, "    [%x] %pISpc%s\n",
402
+			   i, &alist->addrs[i].transport,
403
+			   alist->preferred == i ? "*" : "");
345404 	return 0;
346405 }
347406 
....@@ -563,7 +622,7 @@
563622 
564623 	if (!proc_create_net_data("vlservers", 0444, dir,
565624 				  &afs_proc_cell_vlservers_ops,
566
-				  sizeof(struct seq_net_private),
625
+				  sizeof(struct afs_vl_seq_net_private),
567626 				  cell) ||
568627 	    !proc_create_net_data("volumes", 0444, dir,
569628 				  &afs_proc_cell_volumes_ops,