root/drivers/block/drbd/drbd_proc.c

DEFINITIONS

1. seq_printf_with_thousands_grouping
2. drbd_get_syncer_progress
3. drbd_syncer_progress
4. drbd_seq_show

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3    drbd_proc.c
   4 
   5    This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
   6 
   7    Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
   8    Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
   9    Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
  10 
  11 
  12  */
  13 
  14 #include <linux/module.h>
  15 
  16 #include <linux/uaccess.h>
  17 #include <linux/fs.h>
  18 #include <linux/file.h>
  19 #include <linux/proc_fs.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/drbd.h>
  22 #include "drbd_int.h"
  23 
  24 struct proc_dir_entry *drbd_proc;
  25 
  26 static void seq_printf_with_thousands_grouping(struct seq_file *seq, long v)
  27 {
  28         /* v is in kB/sec. We don't expect TiByte/sec yet. */
  29         if (unlikely(v >= 1000000)) {
  30                 /* cool: > GiByte/s */
  31                 seq_printf(seq, "%ld,", v / 1000000);
  32                 v %= 1000000;
  33                 seq_printf(seq, "%03ld,%03ld", v/1000, v % 1000);
  34         } else if (likely(v >= 1000))
  35                 seq_printf(seq, "%ld,%03ld", v/1000, v % 1000);
  36         else
  37                 seq_printf(seq, "%ld", v);
  38 }
  39 
  40 static void drbd_get_syncer_progress(struct drbd_device *device,
  41                 union drbd_dev_state state, unsigned long *rs_total,
  42                 unsigned long *bits_left, unsigned int *per_mil_done)
  43 {
  44         /* this is to break it at compile time when we change that, in case we
  45          * want to support more than (1<<32) bits on a 32bit arch. */
  46         typecheck(unsigned long, device->rs_total);
  47         *rs_total = device->rs_total;
  48 
  49         /* note: both rs_total and rs_left are in bits, i.e. in
  50          * units of BM_BLOCK_SIZE.
  51          * for the percentage, we don't care. */
  52 
  53         if (state.conn == C_VERIFY_S || state.conn == C_VERIFY_T)
  54                 *bits_left = device->ov_left;
  55         else
  56                 *bits_left = drbd_bm_total_weight(device) - device->rs_failed;
  57         /* >> 10 to prevent overflow,
  58          * +1 to prevent division by zero */
  59         if (*bits_left > *rs_total) {
  60                 /* D'oh. Maybe a logic bug somewhere.  More likely just a race
  61                  * between state change and reset of rs_total.
  62                  */
  63                 *bits_left = *rs_total;
  64                 *per_mil_done = *rs_total ? 0 : 1000;
  65         } else {
  66                 /* Make sure the division happens in long context.
  67                  * We allow up to one petabyte storage right now,
  68                  * at a granularity of 4k per bit that is 2**38 bits.
  69                  * After shift right and multiplication by 1000,
  70                  * this should still fit easily into a 32bit long,
  71                  * so we don't need a 64bit division on 32bit arch.
  72                  * Note: currently we don't support such large bitmaps on 32bit
  73                  * arch anyways, but no harm done to be prepared for it here.
  74                  */
  75                 unsigned int shift = *rs_total > UINT_MAX ? 16 : 10;
  76                 unsigned long left = *bits_left >> shift;
  77                 unsigned long total = 1UL + (*rs_total >> shift);
  78                 unsigned long tmp = 1000UL - left * 1000UL/total;
  79                 *per_mil_done = tmp;
  80         }
  81 }
  82 
  83 
  84 /*lge
  85  * progress bars shamelessly adapted from driver/md/md.c
  86  * output looks like
  87  *      [=====>..............] 33.5% (23456/123456)
  88  *      finish: 2:20:20 speed: 6,345 (6,456) K/sec
  89  */
  90 static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *seq,
  91                 union drbd_dev_state state)
  92 {
  93         unsigned long db, dt, dbdt, rt, rs_total, rs_left;
  94         unsigned int res;
  95         int i, x, y;
  96         int stalled = 0;
  97 
  98         drbd_get_syncer_progress(device, state, &rs_total, &rs_left, &res);
  99 
 100         x = res/50;
 101         y = 20-x;
 102         seq_puts(seq, "\t[");
 103         for (i = 1; i < x; i++)
 104                 seq_putc(seq, '=');
 105         seq_putc(seq, '>');
 106         for (i = 0; i < y; i++)
 107                 seq_putc(seq, '.');
 108         seq_puts(seq, "] ");
 109 
 110         if (state.conn == C_VERIFY_S || state.conn == C_VERIFY_T)
 111                 seq_puts(seq, "verified:");
 112         else
 113                 seq_puts(seq, "sync'ed:");
 114         seq_printf(seq, "%3u.%u%% ", res / 10, res % 10);
 115 
 116         /* if more than a few GB, display in MB */
 117         if (rs_total > (4UL << (30 - BM_BLOCK_SHIFT)))
 118                 seq_printf(seq, "(%lu/%lu)M",
 119                             (unsigned long) Bit2KB(rs_left >> 10),
 120                             (unsigned long) Bit2KB(rs_total >> 10));
 121         else
 122                 seq_printf(seq, "(%lu/%lu)K",
 123                             (unsigned long) Bit2KB(rs_left),
 124                             (unsigned long) Bit2KB(rs_total));
 125 
 126         seq_puts(seq, "\n\t");
 127 
 128         /* see drivers/md/md.c
 129          * We do not want to overflow, so the order of operands and
 130          * the * 100 / 100 trick are important. We do a +1 to be
 131          * safe against division by zero. We only estimate anyway.
 132          *
 133          * dt: time from mark until now
 134          * db: blocks written from mark until now
 135          * rt: remaining time
 136          */
 137         /* Rolling marks. last_mark+1 may just now be modified.  last_mark+2 is
 138          * at least (DRBD_SYNC_MARKS-2)*DRBD_SYNC_MARK_STEP old, and has at
 139          * least DRBD_SYNC_MARK_STEP time before it will be modified. */
 140         /* ------------------------ ~18s average ------------------------ */
 141         i = (device->rs_last_mark + 2) % DRBD_SYNC_MARKS;
 142         dt = (jiffies - device->rs_mark_time[i]) / HZ;
 143         if (dt > 180)
 144                 stalled = 1;
 145 
 146         if (!dt)
 147                 dt++;
 148         db = device->rs_mark_left[i] - rs_left;
 149         rt = (dt * (rs_left / (db/100+1)))/100; /* seconds */
 150 
 151         seq_printf(seq, "finish: %lu:%02lu:%02lu",
 152                 rt / 3600, (rt % 3600) / 60, rt % 60);
 153 
 154         dbdt = Bit2KB(db/dt);
 155         seq_puts(seq, " speed: ");
 156         seq_printf_with_thousands_grouping(seq, dbdt);
 157         seq_puts(seq, " (");
 158         /* ------------------------- ~3s average ------------------------ */
 159         if (drbd_proc_details >= 1) {
 160                 /* this is what drbd_rs_should_slow_down() uses */
 161                 i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS;
 162                 dt = (jiffies - device->rs_mark_time[i]) / HZ;
 163                 if (!dt)
 164                         dt++;
 165                 db = device->rs_mark_left[i] - rs_left;
 166                 dbdt = Bit2KB(db/dt);
 167                 seq_printf_with_thousands_grouping(seq, dbdt);
 168                 seq_puts(seq, " -- ");
 169         }
 170 
 171         /* --------------------- long term average ---------------------- */
 172         /* mean speed since syncer started
 173          * we do account for PausedSync periods */
 174         dt = (jiffies - device->rs_start - device->rs_paused) / HZ;
 175         if (dt == 0)
 176                 dt = 1;
 177         db = rs_total - rs_left;
 178         dbdt = Bit2KB(db/dt);
 179         seq_printf_with_thousands_grouping(seq, dbdt);
 180         seq_putc(seq, ')');
 181 
 182         if (state.conn == C_SYNC_TARGET ||
 183             state.conn == C_VERIFY_S) {
 184                 seq_puts(seq, " want: ");
 185                 seq_printf_with_thousands_grouping(seq, device->c_sync_rate);
 186         }
 187         seq_printf(seq, " K/sec%s\n", stalled ? " (stalled)" : "");
 188 
 189         if (drbd_proc_details >= 1) {
 190                 /* 64 bit:
 191                  * we convert to sectors in the display below. */
 192                 unsigned long bm_bits = drbd_bm_bits(device);
 193                 unsigned long bit_pos;
 194                 unsigned long long stop_sector = 0;
 195                 if (state.conn == C_VERIFY_S ||
 196                     state.conn == C_VERIFY_T) {
 197                         bit_pos = bm_bits - device->ov_left;
 198                         if (verify_can_do_stop_sector(device))
 199                                 stop_sector = device->ov_stop_sector;
 200                 } else
 201                         bit_pos = device->bm_resync_fo;
 202                 /* Total sectors may be slightly off for oddly
 203                  * sized devices. So what. */
 204                 seq_printf(seq,
 205                         "\t%3d%% sector pos: %llu/%llu",
 206                         (int)(bit_pos / (bm_bits/100+1)),
 207                         (unsigned long long)bit_pos * BM_SECT_PER_BIT,
 208                         (unsigned long long)bm_bits * BM_SECT_PER_BIT);
 209                 if (stop_sector != 0 && stop_sector != ULLONG_MAX)
 210                         seq_printf(seq, " stop sector: %llu", stop_sector);
 211                 seq_putc(seq, '\n');
 212         }
 213 }
 214 
 215 int drbd_seq_show(struct seq_file *seq, void *v)
 216 {
 217         int i, prev_i = -1;
 218         const char *sn;
 219         struct drbd_device *device;
 220         struct net_conf *nc;
 221         union drbd_dev_state state;
 222         char wp;
 223 
 224         static char write_ordering_chars[] = {
 225                 [WO_NONE] = 'n',
 226                 [WO_DRAIN_IO] = 'd',
 227                 [WO_BDEV_FLUSH] = 'f',
 228         };
 229 
 230         seq_printf(seq, "version: " REL_VERSION " (api:%d/proto:%d-%d)\n%s\n",
 231                    API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX, drbd_buildtag());
 232 
 233         /*
 234           cs .. connection state
 235           ro .. node role (local/remote)
 236           ds .. disk state (local/remote)
 237              protocol
 238              various flags
 239           ns .. network send
 240           nr .. network receive
 241           dw .. disk write
 242           dr .. disk read
 243           al .. activity log write count
 244           bm .. bitmap update write count
 245           pe .. pending (waiting for ack or data reply)
 246           ua .. unack'd (still need to send ack or data reply)
 247           ap .. application requests accepted, but not yet completed
 248           ep .. number of epochs currently "on the fly", P_BARRIER_ACK pending
 249           wo .. write ordering mode currently in use
 250          oos .. known out-of-sync kB
 251         */
 252 
 253         rcu_read_lock();
 254         idr_for_each_entry(&drbd_devices, device, i) {
 255                 if (prev_i != i - 1)
 256                         seq_putc(seq, '\n');
 257                 prev_i = i;
 258 
 259                 state = device->state;
 260                 sn = drbd_conn_str(state.conn);
 261 
 262                 if (state.conn == C_STANDALONE &&
 263                     state.disk == D_DISKLESS &&
 264                     state.role == R_SECONDARY) {
 265                         seq_printf(seq, "%2d: cs:Unconfigured\n", i);
 266                 } else {
 267                         /* reset device->congestion_reason */
 268                         bdi_rw_congested(device->rq_queue->backing_dev_info);
 269 
 270                         nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
 271                         wp = nc ? nc->wire_protocol - DRBD_PROT_A + 'A' : ' ';
 272                         seq_printf(seq,
 273                            "%2d: cs:%s ro:%s/%s ds:%s/%s %c %c%c%c%c%c%c\n"
 274                            "    ns:%u nr:%u dw:%u dr:%u al:%u bm:%u "
 275                            "lo:%d pe:%d ua:%d ap:%d ep:%d wo:%c",
 276                            i, sn,
 277                            drbd_role_str(state.role),
 278                            drbd_role_str(state.peer),
 279                            drbd_disk_str(state.disk),
 280                            drbd_disk_str(state.pdsk),
 281                            wp,
 282                            drbd_suspended(device) ? 's' : 'r',
 283                            state.aftr_isp ? 'a' : '-',
 284                            state.peer_isp ? 'p' : '-',
 285                            state.user_isp ? 'u' : '-',
 286                            device->congestion_reason ?: '-',
 287                            test_bit(AL_SUSPENDED, &device->flags) ? 's' : '-',
 288                            device->send_cnt/2,
 289                            device->recv_cnt/2,
 290                            device->writ_cnt/2,
 291                            device->read_cnt/2,
 292                            device->al_writ_cnt,
 293                            device->bm_writ_cnt,
 294                            atomic_read(&device->local_cnt),
 295                            atomic_read(&device->ap_pending_cnt) +
 296                            atomic_read(&device->rs_pending_cnt),
 297                            atomic_read(&device->unacked_cnt),
 298                            atomic_read(&device->ap_bio_cnt),
 299                            first_peer_device(device)->connection->epochs,
 300                            write_ordering_chars[device->resource->write_ordering]
 301                         );
 302                         seq_printf(seq, " oos:%llu\n",
 303                                    Bit2KB((unsigned long long)
 304                                            drbd_bm_total_weight(device)));
 305                 }
 306                 if (state.conn == C_SYNC_SOURCE ||
 307                     state.conn == C_SYNC_TARGET ||
 308                     state.conn == C_VERIFY_S ||
 309                     state.conn == C_VERIFY_T)
 310                         drbd_syncer_progress(device, seq, state);
 311 
 312                 if (drbd_proc_details >= 1 && get_ldev_if_state(device, D_FAILED)) {
 313                         lc_seq_printf_stats(seq, device->resync);
 314                         lc_seq_printf_stats(seq, device->act_log);
 315                         put_ldev(device);
 316                 }
 317 
 318                 if (drbd_proc_details >= 2)
 319                         seq_printf(seq, "\tblocked on activity log: %d\n", atomic_read(&device->ap_actlog_cnt));
 320         }
 321         rcu_read_unlock();
 322 
 323         return 0;
 324 }