LXR linux/drivers/block/drbd/drbd

   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
  36static int drbd_proc_open(struct inode *inode, struct file *file);
  37static int drbd_proc_release(struct inode *inode, struct file *file);
  38
  39
  40struct proc_dir_entry *drbd_proc;
  41const 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
  49void 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 */
  69static 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
 191static 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
 201static 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
 314static 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
 327static 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 */
 334