summaryrefslogtreecommitdiffstats
path: root/drivers/block/drbd/drbd_proc.c
blob: 74ef29247bb5920fe9572807aa0f067b7bbc6fe3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
/*
   drbd_proc.c

   This file is part of DRBD by Philipp Reisner and Lars Ellenberg.

   Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
   Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
   Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.

   drbd is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   drbd is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with drbd; see the file COPYING.  If not, write to
   the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

 */

#include <linux/module.h>

#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/drbd.h>
#include "drbd_int.h"

struct proc_dir_entry *drbd_proc;

static void seq_printf_with_thousands_grouping(struct seq_file *seq, long v)
{
	/* v is in kB/sec. We don't expect TiByte/sec yet. */
	if (unlikely(v >= 1000000)) {
		/* cool: > GiByte/s */
		seq_printf(seq, "%ld,", v / 1000000);
		v %= 1000000;
		seq_printf(seq, "%03ld,%03ld", v/1000, v % 1000);
	} else if (likely(v >= 1000))
		seq_printf(seq, "%ld,%03ld", v/1000, v % 1000);
	else
		seq_printf(seq, "%ld", v);
}

static void drbd_get_syncer_progress(struct drbd_device *device,
		union drbd_dev_state state, unsigned long *rs_total,
		unsigned long *bits_left, unsigned int *per_mil_done)
{
	/* this is to break it at compile time when we change that, in case we
	 * want to support more than (1<<32) bits on a 32bit arch. */
	typecheck(unsigned long, device->rs_total);
	*rs_total = device->rs_total;

	/* note: both rs_total and rs_left are in bits, i.e. in
	 * units of BM_BLOCK_SIZE.
	 * for the percentage, we don't care. */

	if (state.conn == C_VERIFY_S || state.conn == C_VERIFY_T)
		*bits_left = device->ov_left;
	else
		*bits_left = drbd_bm_total_weight(device) - device->rs_failed;
	/* >> 10 to prevent overflow,
	 * +1 to prevent division by zero */
	if (*bits_left > *rs_total) {
		/* D'oh. Maybe a logic bug somewhere.  More likely just a race
		 * between state change and reset of rs_total.
		 */
		*bits_left = *rs_total;
		*per_mil_done = *rs_total ? 0 : 1000;
	} else {
		/* Make sure the division happens in long context.
		 * We allow up to one petabyte storage right now,
		 * at a granularity of 4k per bit that is 2**38 bits.
		 * After shift right and multiplication by 1000,
		 * this should still fit easily into a 32bit long,
		 * so we don't need a 64bit division on 32bit arch.
		 * Note: currently we don't support such large bitmaps on 32bit
		 * arch anyways, but no harm done to be prepared for it here.
		 */
		unsigned int shift = *rs_total > UINT_MAX ? 16 : 10;
		unsigned long left = *bits_left >> shift;
		unsigned long total = 1UL + (*rs_total >> shift);
		unsigned long tmp = 1000UL - left * 1000UL/total;
		*per_mil_done = tmp;
	}
}


/*lge
 * progress bars shamelessly adapted from driver/md/md.c
 * output looks like
 *	[=====>..............] 33.5% (23456/123456)
 *	finish: 2:20:20 speed: 6,345 (6,456) K/sec
 */
static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *seq,
		union drbd_dev_state state)
{
	unsigned long db, dt, dbdt, rt, rs_total, rs_left;
	unsigned int res;
	int i, x, y;
	int stalled = 0;

	drbd_get_syncer_progress(device, state, &rs_total, &rs_left, &res);

	x = res/50;
	y = 20-x;
	seq_puts(seq, "\t[");
	for (i = 1; i < x; i++)
		seq_putc(seq, '=');
	seq_putc(seq, '>');
	for (i = 0; i < y; i++)
		seq_putc(seq, '.');
	seq_puts(seq, "] ");

	if (state.conn == C_VERIFY_S || state.conn == C_VERIFY_T)
		seq_puts(seq, "verified:");
	else
		seq_puts(seq, "sync'ed:");
	seq_printf(seq, "%3u.%u%% ", res / 10, res % 10);

	/* if more than a few GB, display in MB */
	if (rs_total > (4UL << (30 - BM_BLOCK_SHIFT)))
		seq_printf(seq, "(%lu/%lu)M",
			    (unsigned long) Bit2KB(rs_left >> 10),
			    (unsigned long) Bit2KB(rs_total >> 10));
	else
		seq_printf(seq, "(%lu/%lu)K",
			    (unsigned long) Bit2KB(rs_left),
			    (unsigned long) Bit2KB(rs_total));

	seq_puts(seq, "\n\t");

	/* see drivers/md/md.c
	 * We do not want to overflow, so the order of operands and
	 * the * 100 / 100 trick are important. We do a +1 to be
	 * safe against division by zero. We only estimate anyway.
	 *
	 * dt: time from mark until now
	 * db: blocks written from mark until now
	 * rt: remaining time
	 */
	/* Rolling marks. last_mark+1 may just now be modified.  last_mark+2 is
	 * at least (DRBD_SYNC_MARKS-2)*DRBD_SYNC_MARK_STEP old, and has at
	 * least DRBD_SYNC_MARK_STEP time before it will be modified. */
	/* ------------------------ ~18s average ------------------------ */
	i = (device->rs_last_mark + 2) % DRBD_SYNC_MARKS;
	dt = (jiffies - device->rs_mark_time[i]) / HZ;
	if (dt > 180)
		stalled = 1;

	if (!dt)
		dt++;
	db = device->rs_mark_left[i] - rs_left;
	rt = (dt * (rs_left / (db/100+1)))/100; /* seconds */

	seq_printf(seq, "finish: %lu:%02lu:%02lu",
		rt / 3600, (rt % 3600) / 60, rt % 60);

	dbdt = Bit2KB(db/dt);
	seq_puts(seq, " speed: ");
	seq_printf_with_thousands_grouping(seq, dbdt);
	seq_puts(seq, " (");
	/* ------------------------- ~3s average ------------------------ */
	if (drbd_proc_details >= 1) {
		/* this is what drbd_rs_should_slow_down() uses */
		i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS;
		dt = (jiffies - device->rs_mark_time[i]) / HZ;
		if (!dt)
			dt++;
		db = device->rs_mark_left[i] - rs_left;
		dbdt = Bit2KB(db/dt);
		seq_printf_with_thousands_grouping(seq, dbdt);
		seq_puts(seq, " -- ");
	}

	/* --------------------- long term average ---------------------- */
	/* mean speed since syncer started
	 * we do account for PausedSync periods */
	dt = (jiffies - device->rs_start - device->rs_paused) / HZ;
	if (dt == 0)
		dt = 1;
	db = rs_total - rs_left;
	dbdt = Bit2KB(db/dt);
	seq_printf_with_thousands_grouping(seq, dbdt);
	seq_putc(seq, ')');

	if (state.conn == C_SYNC_TARGET ||
	    state.conn == C_VERIFY_S) {
		seq_puts(seq, " want: ");
		seq_printf_with_thousands_grouping(seq, device->c_sync_rate);
	}
	seq_printf(seq, " K/sec%s\n", stalled ? " (stalled)" : "");

	if (drbd_proc_details >= 1) {
		/* 64 bit:
		 * we convert to sectors in the display below. */
		unsigned long bm_bits = drbd_bm_bits(device);
		unsigned long bit_pos;
		unsigned long long stop_sector = 0;
		if (state.conn == C_VERIFY_S ||
		    state.conn == C_VERIFY_T) {
			bit_pos = bm_bits - device->ov_left;
			if (verify_can_do_stop_sector(device))
				stop_sector = device->ov_stop_sector;
		} else
			bit_pos = device->bm_resync_fo;
		/* Total sectors may be slightly off for oddly
		 * sized devices. So what. */
		seq_printf(seq,
			"\t%3d%% sector pos: %llu/%llu",
			(int)(bit_pos / (bm_bits/100+1)),
			(unsigned long long)bit_pos * BM_SECT_PER_BIT,
			(unsigned long long)bm_bits * BM_SECT_PER_BIT);
		if (stop_sector != 0 && stop_sector != ULLONG_MAX)
			seq_printf(seq, " stop sector: %llu", stop_sector);
		seq_putc(seq, '\n');
	}
}

int drbd_seq_show(struct seq_file *seq, void *v)
{
	int i, prev_i = -1;
	const char *sn;
	struct drbd_device *device;
	struct net_conf *nc;
	union drbd_dev_state state;
	char wp;

	static char write_ordering_chars[] = {
		[WO_NONE] = 'n',
		[WO_DRAIN_IO] = 'd',
		[WO_BDEV_FLUSH] = 'f',
	};

	seq_printf(seq, "version: " REL_VERSION " (api:%d/proto:%d-%d)\n%s\n",
		   API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX, drbd_buildtag());

	/*
	  cs .. connection state
	  ro .. node role (local/remote)
	  ds .. disk state (local/remote)
	     protocol
	     various flags
	  ns .. network send
	  nr .. network receive
	  dw .. disk write
	  dr .. disk read
	  al .. activity log write count
	  bm .. bitmap update write count
	  pe .. pending (waiting for ack or data reply)
	  ua .. unack'd (still need to send ack or data reply)
	  ap .. application requests accepted, but not yet completed
	  ep .. number of epochs currently "on the fly", P_BARRIER_ACK pending
	  wo .. write ordering mode currently in use
	 oos .. known out-of-sync kB
	*/

	rcu_read_lock();
	idr_for_each_entry(&drbd_devices, device, i) {
		if (prev_i != i - 1)
			seq_putc(seq, '\n');
		prev_i = i;

		state = device->state;
		sn = drbd_conn_str(state.conn);

		if (state.conn == C_STANDALONE &&
		    state.disk == D_DISKLESS &&
		    state.role == R_SECONDARY) {
			seq_printf(seq, "%2d: cs:Unconfigured\n", i);
		} else {
			/* reset device->congestion_reason */
			bdi_rw_congested(device->rq_queue->backing_dev_info);

			nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
			wp = nc ? nc->wire_protocol - DRBD_PROT_A + 'A' : ' ';
			seq_printf(seq,
			   "%2d: cs:%s ro:%s/%s ds:%s/%s %c %c%c%c%c%c%c\n"
			   "    ns:%u nr:%u dw:%u dr:%u al:%u bm:%u "
			   "lo:%d pe:%d ua:%d ap:%d ep:%d wo:%c",
			   i, sn,
			   drbd_role_str(state.role),
			   drbd_role_str(state.peer),
			   drbd_disk_str(state.disk),
			   drbd_disk_str(state.pdsk),
			   wp,
			   drbd_suspended(device) ? 's' : 'r',
			   state.aftr_isp ? 'a' : '-',
			   state.peer_isp ? 'p' : '-',
			   state.user_isp ? 'u' : '-',
			   device->congestion_reason ?: '-',
			   test_bit(AL_SUSPENDED, &device->flags) ? 's' : '-',
			   device->send_cnt/2,
			   device->recv_cnt/2,
			   device->writ_cnt/2,
			   device->read_cnt/2,
			   device->al_writ_cnt,
			   device->bm_writ_cnt,
			   atomic_read(&device->local_cnt),
			   atomic_read(&device->ap_pending_cnt) +
			   atomic_read(&device->rs_pending_cnt),
			   atomic_read(&device->unacked_cnt),
			   atomic_read(&device->ap_bio_cnt),
			   first_peer_device(device)->connection->epochs,
			   write_ordering_chars[device->resource->write_ordering]
			);
			seq_printf(seq, " oos:%llu\n",
				   Bit2KB((unsigned long long)
					   drbd_bm_total_weight(device)));
		}
		if (state.conn == C_SYNC_SOURCE ||
		    state.conn == C_SYNC_TARGET ||
		    state.conn == C_VERIFY_S ||
		    state.conn == C_VERIFY_T)
			drbd_syncer_progress(device, seq, state);

		if (drbd_proc_details >= 1 && get_ldev_if_state(device, D_FAILED)) {
			lc_seq_printf_stats(seq, device->resync);
			lc_seq_printf_stats(seq, device->act_log);
			put_ldev(device);
		}

		if (drbd_proc_details >= 2)
			seq_printf(seq, "\tblocked on activity log: %d\n", atomic_read(&device->ap_actlog_cnt));
	}
	rcu_read_unlock();

	return 0;
}