drivers/block/drbd/drbd_proc.c

   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
  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  */
  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                 unsigned long long stop_sector = 0;
 171                 if (mdev->state.conn == C_VERIFY_S ||
 172                     mdev->state.conn == C_VERIFY_T) {
 173                         bit_pos = bm_bits - mdev->ov_left;
 174                         if (verify_can_do_stop_sector(mdev))
 175                                 stop_sector = mdev->ov_stop_sector;
 176                 } else
 177                         bit_pos = mdev->bm_resync_fo;
 178                 /* Total sectors may be slightly off for oddly
 179                  * sized devices. So what. */
 180                 seq_printf(seq,
 181                         "\t%3d%% sector pos: %llu/%llu",
 182                         (int)(bit_pos / (bm_bits/100+1)),
 183                         (unsigned long long)bit_pos * BM_SECT_PER_BIT,
 184                         (unsigned long long)bm_bits * BM_SECT_PER_BIT);
 185                 if (stop_sector != 0 && stop_sector != ULLONG_MAX)
 186                         seq_printf(seq, " stop sector: %llu", stop_sector);
 187                 seq_printf(seq, "\n");
 188         }
 189 }
 190
 191 static void resync_dump_detail(struct seq_file *seq, struct lc_element *e)
 192 {
 193         struct bm_extent *bme = lc_entry(e, struct bm_extent, lce);
 194
 195         seq_printf(seq, "%5d %s %s\n", bme->rs_left,
 196                    bme->flags & BME_NO_WRITES ? "NO_WRITES" : "---------",
 197                    bme->flags & BME_LOCKED ? "LOCKED" : "------"
 198                    );
 199 }
 200
 201 static int drbd_seq_show(struct seq_file *seq, void *v)
 202 {
 203         int i, prev_i = -1;
 204         const char *sn;
 205         struct drbd_conf *mdev;
 206         struct net_conf *nc;
 207         char wp;
 208
 209         static char write_ordering_chars[] = {
 210                 [WO_none] = 'n',
 211                 [WO_drain_io] = 'd',
 212                 [WO_bdev_flush] = 'f',
 213         };
 214
 215         seq_printf(seq, "version: " REL_VERSION " (api:%d/proto:%d-%d)\n%s\n",
 216                    API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX, drbd_buildtag());
 217
 218         /*
 219           cs .. connection state
 220           ro .. node role (local/remote)
 221           ds .. disk state (local/remote)
 222              protocol
 223              various flags
 224           ns .. network send
 225           nr .. network receive
 226           dw .. disk write
 227           dr .. disk read
 228           al .. activity log write count
 229           bm .. bitmap update write count
 230           pe .. pending (waiting for ack or data reply)
 231           ua .. unack'd (still need to send ack or data reply)
 232           ap .. application requests accepted, but not yet completed
 233           ep .. number of epochs currently "on the fly", P_BARRIER_ACK pending
 234           wo .. write ordering mode currently in use
 235          oos .. known out-of-sync kB
 236         */
 237
 238         rcu_read_lock();
 239         idr_for_each_entry(&minors, mdev, i) {
 240                 if (prev_i != i - 1)
 241                         seq_printf(seq, "\n");
 242                 prev_i = i;
 243
 244                 sn = drbd_conn_str(mdev->state.conn);
 245
 246                 if (mdev->state.conn == C_STANDALONE &&
 247                     mdev->state.disk == D_DISKLESS &&
 248                     mdev->state.role == R_SECONDARY) {
 249                         seq_printf(seq, "%2d: cs:Unconfigured\n", i);
 250                 } else {
 251                         /* reset mdev->congestion_reason */
 252                         bdi_rw_congested(&mdev->rq_queue->backing_dev_info);
 253
 254                         nc = rcu_dereference(mdev->tconn->net_conf);
 255                         wp = nc ? nc->wire_protocol - DRBD_PROT_A + 'A' : ' ';
 256                         seq_printf(seq,
 257                            "%2d: cs:%s ro:%s/%s ds:%s/%s %c %c%c%c%c%c%c\n"
 258                            "    ns:%u nr:%u dw:%u dr:%u al:%u bm:%u "
 259                            "lo:%d pe:%d ua:%d ap:%d ep:%d wo:%c",
 260                            i, sn,
 261                            drbd_role_str(mdev->state.role),
 262                            drbd_role_str(mdev->state.peer),
 263                            drbd_disk_str(mdev->state.disk),
 264                            drbd_disk_str(mdev->state.pdsk),
 265                            wp,
 266                            drbd_suspended(mdev) ? 's' : 'r',
 267                            mdev->state.aftr_isp ? 'a' : '-',
 268                            mdev->state.peer_isp ? 'p' : '-',
 269                            mdev->state.user_isp ? 'u' : '-',
 270                            mdev->congestion_reason ?: '-',
 271                            test_bit(AL_SUSPENDED, &mdev->flags) ? 's' : '-',
 272                            mdev->send_cnt/2,
 273                            mdev->recv_cnt/2,
 274                            mdev->writ_cnt/2,
 275                            mdev->read_cnt/2,
 276                            mdev->al_writ_cnt,
 277                            mdev->bm_writ_cnt,
 278                            atomic_read(&mdev->local_cnt),
 279                            atomic_read(&mdev->ap_pending_cnt) +
 280                            atomic_read(&mdev->rs_pending_cnt),
 281                            atomic_read(&mdev->unacked_cnt),
 282                            atomic_read(&mdev->ap_bio_cnt),
 283                            mdev->tconn->epochs,
 284                            write_ordering_chars[mdev->tconn->write_ordering]
 285                         );
 286                         seq_printf(seq, " oos:%llu\n",
 287                                    Bit2KB((unsigned long long)
 288                                            drbd_bm_total_weight(mdev)));
 289                 }
 290                 if (mdev->state.conn == C_SYNC_SOURCE ||
 291                     mdev->state.conn == C_SYNC_TARGET ||
 292                     mdev->state.conn == C_VERIFY_S ||
 293                     mdev->state.conn == C_VERIFY_T)
 294                         drbd_syncer_progress(mdev, seq);
 295
 296                 if (proc_details >= 1 && get_ldev_if_state(mdev, D_FAILED)) {
 297                         lc_seq_printf_stats(seq, mdev->resync);
 298                         lc_seq_printf_stats(seq, mdev->act_log);
 299                         put_ldev(mdev);
 300                 }
 301
 302                 if (proc_details >= 2) {
 303                         if (mdev->resync) {
 304                                 lc_seq_dump_details(seq, mdev->resync, "rs_left",
 305                                         resync_dump_detail);
 306                         }
 307                 }
 308         }
 309         rcu_read_unlock();
 310
 311         return 0;
 312 }
 313
 314 static int drbd_proc_open(struct inode *inode, struct file *file)
 315 {
 316         int err;
 317
 318         if (try_module_get(THIS_MODULE)) {
 319                 err = single_open(file, drbd_seq_show, PDE_DATA(inode));
 320                 if (err)
 321                         module_put(THIS_MODULE);
 322                 return err;
 323         }
 324         return -ENODEV;
 325 }
 326
 327 static int drbd_proc_release(struct inode *inode, struct file *file)
 328 {
 329         module_put(THIS_MODULE);
 330         return single_release(inode, file);
 331 }
 332
 333 /* PROC FS stuff end */