4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
6 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
7 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
8 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
10 drbd is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2, or (at your option)
15 drbd is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with drbd; see the file COPYING. If not, write to
22 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include <linux/module.h>
28 #include <asm/uaccess.h>
30 #include <linux/file.h>
31 #include <linux/proc_fs.h>
32 #include <linux/seq_file.h>
33 #include <linux/drbd.h>
36 static int drbd_proc_open(struct inode *inode, struct file *file);
37 static int drbd_proc_release(struct inode *inode, struct file *file);
40 struct proc_dir_entry *drbd_proc;
41 const struct file_operations drbd_proc_fops = {
43 .open = drbd_proc_open,
46 .release = drbd_proc_release,
49 static void seq_printf_with_thousands_grouping(struct seq_file *seq, long v)
51 /* v is in kB/sec. We don't expect TiByte/sec yet. */
52 if (unlikely(v >= 1000000)) {
53 /* cool: > GiByte/s */
54 seq_printf(seq, "%ld,", v / 1000000);
56 seq_printf(seq, "%03ld,%03ld", v/1000, v % 1000);
57 } else if (likely(v >= 1000))
58 seq_printf(seq, "%ld,%03ld", v/1000, v % 1000);
60 seq_printf(seq, "%ld", v);
63 static void drbd_get_syncer_progress(struct drbd_device *device,
64 union drbd_dev_state state, unsigned long *rs_total,
65 unsigned long *bits_left, unsigned int *per_mil_done)
67 /* this is to break it at compile time when we change that, in case we
68 * want to support more than (1<<32) bits on a 32bit arch. */
69 typecheck(unsigned long, device->rs_total);
70 *rs_total = device->rs_total;
72 /* note: both rs_total and rs_left are in bits, i.e. in
73 * units of BM_BLOCK_SIZE.
74 * for the percentage, we don't care. */
76 if (state.conn == C_VERIFY_S || state.conn == C_VERIFY_T)
77 *bits_left = device->ov_left;
79 *bits_left = drbd_bm_total_weight(device) - device->rs_failed;
80 /* >> 10 to prevent overflow,
81 * +1 to prevent division by zero */
82 if (*bits_left > *rs_total) {
83 /* D'oh. Maybe a logic bug somewhere. More likely just a race
84 * between state change and reset of rs_total.
86 *bits_left = *rs_total;
87 *per_mil_done = *rs_total ? 0 : 1000;
89 /* Make sure the division happens in long context.
90 * We allow up to one petabyte storage right now,
91 * at a granularity of 4k per bit that is 2**38 bits.
92 * After shift right and multiplication by 1000,
93 * this should still fit easily into a 32bit long,
94 * so we don't need a 64bit division on 32bit arch.
95 * Note: currently we don't support such large bitmaps on 32bit
96 * arch anyways, but no harm done to be prepared for it here.
98 unsigned int shift = *rs_total > UINT_MAX ? 16 : 10;
99 unsigned long left = *bits_left >> shift;
100 unsigned long total = 1UL + (*rs_total >> shift);
101 unsigned long tmp = 1000UL - left * 1000UL/total;
108 * progress bars shamelessly adapted from driver/md/md.c
110 * [=====>..............] 33.5% (23456/123456)
111 * finish: 2:20:20 speed: 6,345 (6,456) K/sec
113 static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *seq,
114 union drbd_dev_state state)
116 unsigned long db, dt, dbdt, rt, rs_total, rs_left;
121 drbd_get_syncer_progress(device, state, &rs_total, &rs_left, &res);
125 seq_printf(seq, "\t[");
126 for (i = 1; i < x; i++)
127 seq_printf(seq, "=");
128 seq_printf(seq, ">");
129 for (i = 0; i < y; i++)
130 seq_printf(seq, ".");
131 seq_printf(seq, "] ");
133 if (state.conn == C_VERIFY_S || state.conn == C_VERIFY_T)
134 seq_printf(seq, "verified:");
136 seq_printf(seq, "sync'ed:");
137 seq_printf(seq, "%3u.%u%% ", res / 10, res % 10);
139 /* if more than a few GB, display in MB */
140 if (rs_total > (4UL << (30 - BM_BLOCK_SHIFT)))
141 seq_printf(seq, "(%lu/%lu)M",
142 (unsigned long) Bit2KB(rs_left >> 10),
143 (unsigned long) Bit2KB(rs_total >> 10));
145 seq_printf(seq, "(%lu/%lu)K\n\t",
146 (unsigned long) Bit2KB(rs_left),
147 (unsigned long) Bit2KB(rs_total));
149 /* see drivers/md/md.c
150 * We do not want to overflow, so the order of operands and
151 * the * 100 / 100 trick are important. We do a +1 to be
152 * safe against division by zero. We only estimate anyway.
154 * dt: time from mark until now
155 * db: blocks written from mark until now
158 /* Rolling marks. last_mark+1 may just now be modified. last_mark+2 is
159 * at least (DRBD_SYNC_MARKS-2)*DRBD_SYNC_MARK_STEP old, and has at
160 * least DRBD_SYNC_MARK_STEP time before it will be modified. */
161 /* ------------------------ ~18s average ------------------------ */
162 i = (device->rs_last_mark + 2) % DRBD_SYNC_MARKS;
163 dt = (jiffies - device->rs_mark_time[i]) / HZ;
169 db = device->rs_mark_left[i] - rs_left;
170 rt = (dt * (rs_left / (db/100+1)))/100; /* seconds */
172 seq_printf(seq, "finish: %lu:%02lu:%02lu",
173 rt / 3600, (rt % 3600) / 60, rt % 60);
175 dbdt = Bit2KB(db/dt);
176 seq_printf(seq, " speed: ");
177 seq_printf_with_thousands_grouping(seq, dbdt);
178 seq_printf(seq, " (");
179 /* ------------------------- ~3s average ------------------------ */
180 if (proc_details >= 1) {
181 /* this is what drbd_rs_should_slow_down() uses */
182 i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS;
183 dt = (jiffies - device->rs_mark_time[i]) / HZ;
186 db = device->rs_mark_left[i] - rs_left;
187 dbdt = Bit2KB(db/dt);
188 seq_printf_with_thousands_grouping(seq, dbdt);
189 seq_printf(seq, " -- ");
192 /* --------------------- long term average ---------------------- */
193 /* mean speed since syncer started
194 * we do account for PausedSync periods */
195 dt = (jiffies - device->rs_start - device->rs_paused) / HZ;
198 db = rs_total - rs_left;
199 dbdt = Bit2KB(db/dt);
200 seq_printf_with_thousands_grouping(seq, dbdt);
201 seq_printf(seq, ")");
203 if (state.conn == C_SYNC_TARGET ||
204 state.conn == C_VERIFY_S) {
205 seq_printf(seq, " want: ");
206 seq_printf_with_thousands_grouping(seq, device->c_sync_rate);
208 seq_printf(seq, " K/sec%s\n", stalled ? " (stalled)" : "");
210 if (proc_details >= 1) {
212 * we convert to sectors in the display below. */
213 unsigned long bm_bits = drbd_bm_bits(device);
214 unsigned long bit_pos;
215 unsigned long long stop_sector = 0;
216 if (state.conn == C_VERIFY_S ||
217 state.conn == C_VERIFY_T) {
218 bit_pos = bm_bits - device->ov_left;
219 if (verify_can_do_stop_sector(device))
220 stop_sector = device->ov_stop_sector;
222 bit_pos = device->bm_resync_fo;
223 /* Total sectors may be slightly off for oddly
224 * sized devices. So what. */
226 "\t%3d%% sector pos: %llu/%llu",
227 (int)(bit_pos / (bm_bits/100+1)),
228 (unsigned long long)bit_pos * BM_SECT_PER_BIT,
229 (unsigned long long)bm_bits * BM_SECT_PER_BIT);
230 if (stop_sector != 0 && stop_sector != ULLONG_MAX)
231 seq_printf(seq, " stop sector: %llu", stop_sector);
232 seq_printf(seq, "\n");
236 static int drbd_seq_show(struct seq_file *seq, void *v)
240 struct drbd_device *device;
242 union drbd_dev_state state;
245 static char write_ordering_chars[] = {
248 [WO_bdev_flush] = 'f',
251 seq_printf(seq, "version: " REL_VERSION " (api:%d/proto:%d-%d)\n%s\n",
252 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX, drbd_buildtag());
255 cs .. connection state
256 ro .. node role (local/remote)
257 ds .. disk state (local/remote)
261 nr .. network receive
264 al .. activity log write count
265 bm .. bitmap update write count
266 pe .. pending (waiting for ack or data reply)
267 ua .. unack'd (still need to send ack or data reply)
268 ap .. application requests accepted, but not yet completed
269 ep .. number of epochs currently "on the fly", P_BARRIER_ACK pending
270 wo .. write ordering mode currently in use
271 oos .. known out-of-sync kB
275 idr_for_each_entry(&drbd_devices, device, i) {
277 seq_printf(seq, "\n");
280 state = device->state;
281 sn = drbd_conn_str(state.conn);
283 if (state.conn == C_STANDALONE &&
284 state.disk == D_DISKLESS &&
285 state.role == R_SECONDARY) {
286 seq_printf(seq, "%2d: cs:Unconfigured\n", i);
288 /* reset device->congestion_reason */
289 bdi_rw_congested(&device->rq_queue->backing_dev_info);
291 nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
292 wp = nc ? nc->wire_protocol - DRBD_PROT_A + 'A' : ' ';
294 "%2d: cs:%s ro:%s/%s ds:%s/%s %c %c%c%c%c%c%c\n"
295 " ns:%u nr:%u dw:%u dr:%u al:%u bm:%u "
296 "lo:%d pe:%d ua:%d ap:%d ep:%d wo:%c",
298 drbd_role_str(state.role),
299 drbd_role_str(state.peer),
300 drbd_disk_str(state.disk),
301 drbd_disk_str(state.pdsk),
303 drbd_suspended(device) ? 's' : 'r',
304 state.aftr_isp ? 'a' : '-',
305 state.peer_isp ? 'p' : '-',
306 state.user_isp ? 'u' : '-',
307 device->congestion_reason ?: '-',
308 test_bit(AL_SUSPENDED, &device->flags) ? 's' : '-',
315 atomic_read(&device->local_cnt),
316 atomic_read(&device->ap_pending_cnt) +
317 atomic_read(&device->rs_pending_cnt),
318 atomic_read(&device->unacked_cnt),
319 atomic_read(&device->ap_bio_cnt),
320 first_peer_device(device)->connection->epochs,
321 write_ordering_chars[device->resource->write_ordering]
323 seq_printf(seq, " oos:%llu\n",
324 Bit2KB((unsigned long long)
325 drbd_bm_total_weight(device)));
327 if (state.conn == C_SYNC_SOURCE ||
328 state.conn == C_SYNC_TARGET ||
329 state.conn == C_VERIFY_S ||
330 state.conn == C_VERIFY_T)
331 drbd_syncer_progress(device, seq, state);
333 if (proc_details >= 1 && get_ldev_if_state(device, D_FAILED)) {
334 lc_seq_printf_stats(seq, device->resync);
335 lc_seq_printf_stats(seq, device->act_log);
339 if (proc_details >= 2)
340 seq_printf(seq, "\tblocked on activity log: %d\n", atomic_read(&device->ap_actlog_cnt));
347 static int drbd_proc_open(struct inode *inode, struct file *file)
351 if (try_module_get(THIS_MODULE)) {
352 err = single_open(file, drbd_seq_show, NULL);
354 module_put(THIS_MODULE);
360 static int drbd_proc_release(struct inode *inode, struct file *file)
362 module_put(THIS_MODULE);
363 return single_release(inode, file);
366 /* PROC FS stuff end */