1 /*
2 drbd_proc.c
3
4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
5
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>.
9
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)
13 any later version.
14
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.
19
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.
23
24 */
25
26 #include <linux/module.h>
27
28 #include <asm/uaccess.h>
29 #include <linux/fs.h>
30 #include <linux/file.h>
31 #include <linux/proc_fs.h>
32 #include <linux/seq_file.h>
33 #include <linux/drbd.h>
34 #include "drbd_int.h"
35
36 static int drbd_proc_open(struct inode *inode, struct file *file);
37 static int drbd_proc_release(struct inode *inode, struct file *file);
38
39
40 struct proc_dir_entry *drbd_proc;
41 const struct file_operations drbd_proc_fops = {
42 .owner = THIS_MODULE,
43 .open = drbd_proc_open,
44 .read = seq_read,
45 .llseek = seq_lseek,
46 .release = drbd_proc_release,
47 };
48
seq_printf_with_thousands_grouping(struct seq_file * seq,long v)49 void seq_printf_with_thousands_grouping(struct seq_file *seq, long v)
50 {
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);
55 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);
59 else
60 seq_printf(seq, "%ld", v);
61 }
62
63 /*lge
64 * progress bars shamelessly adapted from driver/md/md.c
65 * output looks like
66 * [=====>..............] 33.5% (23456/123456)
67 * finish: 2:20:20 speed: 6,345 (6,456) K/sec
68 */
drbd_syncer_progress(struct drbd_conf * mdev,struct seq_file * seq)69 static void drbd_syncer_progress(struct drbd_conf *mdev, struct seq_file *seq)
70 {
71 unsigned long db, dt, dbdt, rt, rs_left;
72 unsigned int res;
73 int i, x, y;
74 int stalled = 0;
75
76 drbd_get_syncer_progress(mdev, &rs_left, &res);
77
78 x = res/50;
79 y = 20-x;
80 seq_printf(seq, "\t[");
81 for (i = 1; i < x; i++)
82 seq_printf(seq, "=");
83 seq_printf(seq, ">");
84 for (i = 0; i < y; i++)
85 seq_printf(seq, ".");
86 seq_printf(seq, "] ");
87
88 if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T)
89 seq_printf(seq, "verified:");
90 else
91 seq_printf(seq, "sync'ed:");
92 seq_printf(seq, "%3u.%u%% ", res / 10, res % 10);
93
94 /* if more than a few GB, display in MB */
95 if (mdev->rs_total > (4UL << (30 - BM_BLOCK_SHIFT)))
96 seq_printf(seq, "(%lu/%lu)M",
97 (unsigned long) Bit2KB(rs_left >> 10),
98 (unsigned long) Bit2KB(mdev->rs_total >> 10));
99 else
100 seq_printf(seq, "(%lu/%lu)K\n\t",
101 (unsigned long) Bit2KB(rs_left),
102 (unsigned long) Bit2KB(mdev->rs_total));
103
104 /* see drivers/md/md.c
105 * We do not want to overflow, so the order of operands and
106 * the * 100 / 100 trick are important. We do a +1 to be
107 * safe against division by zero. We only estimate anyway.
108 *
109 * dt: time from mark until now
110 * db: blocks written from mark until now
111 * rt: remaining time
112 */
113 /* Rolling marks. last_mark+1 may just now be modified. last_mark+2 is
114 * at least (DRBD_SYNC_MARKS-2)*DRBD_SYNC_MARK_STEP old, and has at
115 * least DRBD_SYNC_MARK_STEP time before it will be modified. */
116 /* ------------------------ ~18s average ------------------------ */
117 i = (mdev->rs_last_mark + 2) % DRBD_SYNC_MARKS;
118 dt = (jiffies - mdev->rs_mark_time[i]) / HZ;
119 if (dt > (DRBD_SYNC_MARK_STEP * DRBD_SYNC_MARKS))
120 stalled = 1;
121
122 if (!dt)
123 dt++;
124 db = mdev->rs_mark_left[i] - rs_left;
125 rt = (dt * (rs_left / (db/100+1)))/100; /* seconds */
126
127 seq_printf(seq, "finish: %lu:%02lu:%02lu",
128 rt / 3600, (rt % 3600) / 60, rt % 60);
129
130 dbdt = Bit2KB(db/dt);
131 seq_printf(seq, " speed: ");
132 seq_printf_with_thousands_grouping(seq, dbdt);
133 seq_printf(seq, " (");
134 /* ------------------------- ~3s average ------------------------ */
135 if (proc_details >= 1) {
136 /* this is what drbd_rs_should_slow_down() uses */
137 i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS;
138 dt = (jiffies - mdev->rs_mark_time[i]) / HZ;
139 if (!dt)
140 dt++;
141 db = mdev->rs_mark_left[i] - rs_left;
142 dbdt = Bit2KB(db/dt);
143 seq_printf_with_thousands_grouping(seq, dbdt);
144 seq_printf(seq, " -- ");
145 }
146
147 /* --------------------- long term average ---------------------- */
148 /* mean speed since syncer started
149 * we do account for PausedSync periods */
150 dt = (jiffies - mdev->rs_start - mdev->rs_paused) / HZ;
151 if (dt == 0)
152 dt = 1;
153 db = mdev->rs_total - rs_left;
154 dbdt = Bit2KB(db/dt);
155 seq_printf_with_thousands_grouping(seq, dbdt);
156 seq_printf(seq, ")");
157
158 if (mdev->state.conn == C_SYNC_TARGET ||
159 mdev->state.conn == C_VERIFY_S) {
160 seq_printf(seq, " want: ");
161 seq_printf_with_thousands_grouping(seq, mdev->c_sync_rate);
162 }
163 seq_printf(seq, " K/sec%s\n", stalled ? " (stalled)" : "");
164
165 if (proc_details >= 1) {
166 /* 64 bit:
167 * we convert to sectors in the display below. */
168 unsigned long bm_bits = drbd_bm_bits(mdev);
169 unsigned long bit_pos;
170 if (mdev->state.conn == C_VERIFY_S ||
171 mdev->state.conn == C_VERIFY_T)
172 bit_pos = bm_bits - mdev->ov_left;
173 else
174 bit_pos = mdev->bm_resync_fo;
175 /* Total sectors may be slightly off for oddly
176 * sized devices. So what. */
177 seq_printf(seq,
178 "\t%3d%% sector pos: %llu/%llu\n",
179 (int)(bit_pos / (bm_bits/100+1)),
180 (unsigned long long)bit_pos * BM_SECT_PER_BIT,
181 (unsigned long long)bm_bits * BM_SECT_PER_BIT);
182 }
183 }
184
resync_dump_detail(struct seq_file * seq,struct lc_element * e)185 static void resync_dump_detail(struct seq_file *seq, struct lc_element *e)
186 {
187 struct bm_extent *bme = lc_entry(e, struct bm_extent, lce);
188
189 seq_printf(seq, "%5d %s %s\n", bme->rs_left,
190 bme->flags & BME_NO_WRITES ? "NO_WRITES" : "---------",
191 bme->flags & BME_LOCKED ? "LOCKED" : "------"
192 );
193 }
194
drbd_seq_show(struct seq_file * seq,void * v)195 static int drbd_seq_show(struct seq_file *seq, void *v)
196 {
197 int i, hole = 0;
198 const char *sn;
199 struct drbd_conf *mdev;
200
201 static char write_ordering_chars[] = {
202 [WO_none] = 'n',
203 [WO_drain_io] = 'd',
204 [WO_bdev_flush] = 'f',
205 };
206
207 seq_printf(seq, "version: " REL_VERSION " (api:%d/proto:%d-%d)\n%s\n",
208 API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX, drbd_buildtag());
209
210 /*
211 cs .. connection state
212 ro .. node role (local/remote)
213 ds .. disk state (local/remote)
214 protocol
215 various flags
216 ns .. network send
217 nr .. network receive
218 dw .. disk write
219 dr .. disk read
220 al .. activity log write count
221 bm .. bitmap update write count
222 pe .. pending (waiting for ack or data reply)
223 ua .. unack'd (still need to send ack or data reply)
224 ap .. application requests accepted, but not yet completed
225 ep .. number of epochs currently "on the fly", P_BARRIER_ACK pending
226 wo .. write ordering mode currently in use
227 oos .. known out-of-sync kB
228 */
229
230 for (i = 0; i < minor_count; i++) {
231 mdev = minor_to_mdev(i);
232 if (!mdev) {
233 hole = 1;
234 continue;
235 }
236 if (hole) {
237 hole = 0;
238 seq_printf(seq, "\n");
239 }
240
241 sn = drbd_conn_str(mdev->state.conn);
242
243 if (mdev->state.conn == C_STANDALONE &&
244 mdev->state.disk == D_DISKLESS &&
245 mdev->state.role == R_SECONDARY) {
246 seq_printf(seq, "%2d: cs:Unconfigured\n", i);
247 } else {
248 seq_printf(seq,
249 "%2d: cs:%s ro:%s/%s ds:%s/%s %c %c%c%c%c%c%c\n"
250 " ns:%u nr:%u dw:%u dr:%u al:%u bm:%u "
251 "lo:%d pe:%d ua:%d ap:%d ep:%d wo:%c",
252 i, sn,
253 drbd_role_str(mdev->state.role),
254 drbd_role_str(mdev->state.peer),
255 drbd_disk_str(mdev->state.disk),
256 drbd_disk_str(mdev->state.pdsk),
257 (mdev->net_conf == NULL ? ' ' :
258 (mdev->net_conf->wire_protocol - DRBD_PROT_A+'A')),
259 is_susp(mdev->state) ? 's' : 'r',
260 mdev->state.aftr_isp ? 'a' : '-',
261 mdev->state.peer_isp ? 'p' : '-',
262 mdev->state.user_isp ? 'u' : '-',
263 mdev->congestion_reason ?: '-',
264 test_bit(AL_SUSPENDED, &mdev->flags) ? 's' : '-',
265 mdev->send_cnt/2,
266 mdev->recv_cnt/2,
267 mdev->writ_cnt/2,
268 mdev->read_cnt/2,
269 mdev->al_writ_cnt,
270 mdev->bm_writ_cnt,
271 atomic_read(&mdev->local_cnt),
272 atomic_read(&mdev->ap_pending_cnt) +
273 atomic_read(&mdev->rs_pending_cnt),
274 atomic_read(&mdev->unacked_cnt),
275 atomic_read(&mdev->ap_bio_cnt),
276 mdev->epochs,
277 write_ordering_chars[mdev->write_ordering]
278 );
279 seq_printf(seq, " oos:%llu\n",
280 Bit2KB((unsigned long long)
281 drbd_bm_total_weight(mdev)));
282 }
283 if (mdev->state.conn == C_SYNC_SOURCE ||
284 mdev->state.conn == C_SYNC_TARGET ||
285 mdev->state.conn == C_VERIFY_S ||
286 mdev->state.conn == C_VERIFY_T)
287 drbd_syncer_progress(mdev, seq);
288
289 if (proc_details >= 1 && get_ldev_if_state(mdev, D_FAILED)) {
290 lc_seq_printf_stats(seq, mdev->resync);
291 lc_seq_printf_stats(seq, mdev->act_log);
292 put_ldev(mdev);
293 }
294
295 if (proc_details >= 2) {
296 if (mdev->resync) {
297 lc_seq_dump_details(seq, mdev->resync, "rs_left",
298 resync_dump_detail);
299 }
300 }
301 }
302
303 return 0;
304 }
305
drbd_proc_open(struct inode * inode,struct file * file)306 static int drbd_proc_open(struct inode *inode, struct file *file)
307 {
308 if (try_module_get(THIS_MODULE))
309 return single_open(file, drbd_seq_show, PDE(inode)->data);
310 return -ENODEV;
311 }
312
drbd_proc_release(struct inode * inode,struct file * file)313 static int drbd_proc_release(struct inode *inode, struct file *file)
314 {
315 module_put(THIS_MODULE);
316 return single_release(inode, file);
317 }
318
319 /* PROC FS stuff end */
320