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                 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
 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
 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
 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
 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 */