337 lines
10 KiB
C
337 lines
10 KiB
C
/*
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drbd_proc.c
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This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
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Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
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Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
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Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
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drbd is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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drbd is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with drbd; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/drbd.h>
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#include "drbd_int.h"
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struct proc_dir_entry *drbd_proc;
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static void seq_printf_with_thousands_grouping(struct seq_file *seq, long v)
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{
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/* v is in kB/sec. We don't expect TiByte/sec yet. */
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if (unlikely(v >= 1000000)) {
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/* cool: > GiByte/s */
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seq_printf(seq, "%ld,", v / 1000000);
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v %= 1000000;
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seq_printf(seq, "%03ld,%03ld", v/1000, v % 1000);
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} else if (likely(v >= 1000))
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seq_printf(seq, "%ld,%03ld", v/1000, v % 1000);
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else
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seq_printf(seq, "%ld", v);
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}
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static void drbd_get_syncer_progress(struct drbd_device *device,
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union drbd_dev_state state, unsigned long *rs_total,
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unsigned long *bits_left, unsigned int *per_mil_done)
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{
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/* this is to break it at compile time when we change that, in case we
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* want to support more than (1<<32) bits on a 32bit arch. */
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typecheck(unsigned long, device->rs_total);
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*rs_total = device->rs_total;
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/* note: both rs_total and rs_left are in bits, i.e. in
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* units of BM_BLOCK_SIZE.
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* for the percentage, we don't care. */
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if (state.conn == C_VERIFY_S || state.conn == C_VERIFY_T)
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*bits_left = device->ov_left;
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else
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*bits_left = drbd_bm_total_weight(device) - device->rs_failed;
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/* >> 10 to prevent overflow,
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* +1 to prevent division by zero */
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if (*bits_left > *rs_total) {
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/* D'oh. Maybe a logic bug somewhere. More likely just a race
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* between state change and reset of rs_total.
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*/
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*bits_left = *rs_total;
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*per_mil_done = *rs_total ? 0 : 1000;
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} else {
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/* Make sure the division happens in long context.
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* We allow up to one petabyte storage right now,
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* at a granularity of 4k per bit that is 2**38 bits.
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* After shift right and multiplication by 1000,
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* this should still fit easily into a 32bit long,
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* so we don't need a 64bit division on 32bit arch.
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* Note: currently we don't support such large bitmaps on 32bit
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* arch anyways, but no harm done to be prepared for it here.
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*/
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unsigned int shift = *rs_total > UINT_MAX ? 16 : 10;
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unsigned long left = *bits_left >> shift;
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unsigned long total = 1UL + (*rs_total >> shift);
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unsigned long tmp = 1000UL - left * 1000UL/total;
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*per_mil_done = tmp;
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}
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}
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/*lge
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* progress bars shamelessly adapted from driver/md/md.c
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* output looks like
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* [=====>..............] 33.5% (23456/123456)
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* finish: 2:20:20 speed: 6,345 (6,456) K/sec
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*/
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static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *seq,
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union drbd_dev_state state)
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{
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unsigned long db, dt, dbdt, rt, rs_total, rs_left;
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unsigned int res;
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int i, x, y;
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int stalled = 0;
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drbd_get_syncer_progress(device, state, &rs_total, &rs_left, &res);
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x = res/50;
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y = 20-x;
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seq_puts(seq, "\t[");
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for (i = 1; i < x; i++)
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seq_putc(seq, '=');
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seq_putc(seq, '>');
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for (i = 0; i < y; i++)
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seq_putc(seq, '.');
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seq_puts(seq, "] ");
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if (state.conn == C_VERIFY_S || state.conn == C_VERIFY_T)
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seq_puts(seq, "verified:");
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else
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seq_puts(seq, "sync'ed:");
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seq_printf(seq, "%3u.%u%% ", res / 10, res % 10);
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/* if more than a few GB, display in MB */
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if (rs_total > (4UL << (30 - BM_BLOCK_SHIFT)))
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seq_printf(seq, "(%lu/%lu)M",
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(unsigned long) Bit2KB(rs_left >> 10),
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(unsigned long) Bit2KB(rs_total >> 10));
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else
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seq_printf(seq, "(%lu/%lu)K",
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(unsigned long) Bit2KB(rs_left),
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(unsigned long) Bit2KB(rs_total));
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seq_puts(seq, "\n\t");
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/* see drivers/md/md.c
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* We do not want to overflow, so the order of operands and
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* the * 100 / 100 trick are important. We do a +1 to be
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* safe against division by zero. We only estimate anyway.
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*
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* dt: time from mark until now
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* db: blocks written from mark until now
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* rt: remaining time
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*/
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/* Rolling marks. last_mark+1 may just now be modified. last_mark+2 is
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* at least (DRBD_SYNC_MARKS-2)*DRBD_SYNC_MARK_STEP old, and has at
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* least DRBD_SYNC_MARK_STEP time before it will be modified. */
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/* ------------------------ ~18s average ------------------------ */
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i = (device->rs_last_mark + 2) % DRBD_SYNC_MARKS;
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dt = (jiffies - device->rs_mark_time[i]) / HZ;
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if (dt > 180)
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stalled = 1;
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if (!dt)
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dt++;
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db = device->rs_mark_left[i] - rs_left;
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rt = (dt * (rs_left / (db/100+1)))/100; /* seconds */
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seq_printf(seq, "finish: %lu:%02lu:%02lu",
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rt / 3600, (rt % 3600) / 60, rt % 60);
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dbdt = Bit2KB(db/dt);
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seq_puts(seq, " speed: ");
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seq_printf_with_thousands_grouping(seq, dbdt);
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seq_puts(seq, " (");
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/* ------------------------- ~3s average ------------------------ */
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if (drbd_proc_details >= 1) {
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/* this is what drbd_rs_should_slow_down() uses */
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i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS;
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dt = (jiffies - device->rs_mark_time[i]) / HZ;
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if (!dt)
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dt++;
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db = device->rs_mark_left[i] - rs_left;
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dbdt = Bit2KB(db/dt);
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seq_printf_with_thousands_grouping(seq, dbdt);
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seq_puts(seq, " -- ");
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}
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/* --------------------- long term average ---------------------- */
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/* mean speed since syncer started
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* we do account for PausedSync periods */
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dt = (jiffies - device->rs_start - device->rs_paused) / HZ;
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if (dt == 0)
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dt = 1;
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db = rs_total - rs_left;
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dbdt = Bit2KB(db/dt);
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seq_printf_with_thousands_grouping(seq, dbdt);
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seq_putc(seq, ')');
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if (state.conn == C_SYNC_TARGET ||
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state.conn == C_VERIFY_S) {
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seq_puts(seq, " want: ");
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seq_printf_with_thousands_grouping(seq, device->c_sync_rate);
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}
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seq_printf(seq, " K/sec%s\n", stalled ? " (stalled)" : "");
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if (drbd_proc_details >= 1) {
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/* 64 bit:
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* we convert to sectors in the display below. */
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unsigned long bm_bits = drbd_bm_bits(device);
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unsigned long bit_pos;
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unsigned long long stop_sector = 0;
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if (state.conn == C_VERIFY_S ||
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state.conn == C_VERIFY_T) {
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bit_pos = bm_bits - device->ov_left;
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if (verify_can_do_stop_sector(device))
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stop_sector = device->ov_stop_sector;
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} else
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bit_pos = device->bm_resync_fo;
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/* Total sectors may be slightly off for oddly
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* sized devices. So what. */
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seq_printf(seq,
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"\t%3d%% sector pos: %llu/%llu",
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(int)(bit_pos / (bm_bits/100+1)),
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(unsigned long long)bit_pos * BM_SECT_PER_BIT,
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(unsigned long long)bm_bits * BM_SECT_PER_BIT);
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if (stop_sector != 0 && stop_sector != ULLONG_MAX)
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seq_printf(seq, " stop sector: %llu", stop_sector);
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seq_putc(seq, '\n');
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}
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}
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int drbd_seq_show(struct seq_file *seq, void *v)
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{
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int i, prev_i = -1;
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const char *sn;
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struct drbd_device *device;
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struct net_conf *nc;
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union drbd_dev_state state;
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char wp;
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static char write_ordering_chars[] = {
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[WO_NONE] = 'n',
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[WO_DRAIN_IO] = 'd',
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[WO_BDEV_FLUSH] = 'f',
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};
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seq_printf(seq, "version: " REL_VERSION " (api:%d/proto:%d-%d)\n%s\n",
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API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX, drbd_buildtag());
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/*
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cs .. connection state
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ro .. node role (local/remote)
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ds .. disk state (local/remote)
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protocol
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various flags
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ns .. network send
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nr .. network receive
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dw .. disk write
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dr .. disk read
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al .. activity log write count
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bm .. bitmap update write count
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pe .. pending (waiting for ack or data reply)
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ua .. unack'd (still need to send ack or data reply)
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ap .. application requests accepted, but not yet completed
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ep .. number of epochs currently "on the fly", P_BARRIER_ACK pending
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wo .. write ordering mode currently in use
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oos .. known out-of-sync kB
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*/
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rcu_read_lock();
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idr_for_each_entry(&drbd_devices, device, i) {
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if (prev_i != i - 1)
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seq_putc(seq, '\n');
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prev_i = i;
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state = device->state;
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sn = drbd_conn_str(state.conn);
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if (state.conn == C_STANDALONE &&
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state.disk == D_DISKLESS &&
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state.role == R_SECONDARY) {
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seq_printf(seq, "%2d: cs:Unconfigured\n", i);
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} else {
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/* reset device->congestion_reason */
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bdi_rw_congested(device->rq_queue->backing_dev_info);
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nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
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wp = nc ? nc->wire_protocol - DRBD_PROT_A + 'A' : ' ';
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seq_printf(seq,
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"%2d: cs:%s ro:%s/%s ds:%s/%s %c %c%c%c%c%c%c\n"
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" ns:%u nr:%u dw:%u dr:%u al:%u bm:%u "
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"lo:%d pe:%d ua:%d ap:%d ep:%d wo:%c",
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i, sn,
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drbd_role_str(state.role),
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drbd_role_str(state.peer),
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drbd_disk_str(state.disk),
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drbd_disk_str(state.pdsk),
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wp,
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drbd_suspended(device) ? 's' : 'r',
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state.aftr_isp ? 'a' : '-',
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state.peer_isp ? 'p' : '-',
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state.user_isp ? 'u' : '-',
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device->congestion_reason ?: '-',
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test_bit(AL_SUSPENDED, &device->flags) ? 's' : '-',
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device->send_cnt/2,
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device->recv_cnt/2,
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device->writ_cnt/2,
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device->read_cnt/2,
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device->al_writ_cnt,
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device->bm_writ_cnt,
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atomic_read(&device->local_cnt),
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atomic_read(&device->ap_pending_cnt) +
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atomic_read(&device->rs_pending_cnt),
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atomic_read(&device->unacked_cnt),
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atomic_read(&device->ap_bio_cnt),
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first_peer_device(device)->connection->epochs,
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write_ordering_chars[device->resource->write_ordering]
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);
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seq_printf(seq, " oos:%llu\n",
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Bit2KB((unsigned long long)
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drbd_bm_total_weight(device)));
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}
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if (state.conn == C_SYNC_SOURCE ||
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state.conn == C_SYNC_TARGET ||
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state.conn == C_VERIFY_S ||
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state.conn == C_VERIFY_T)
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drbd_syncer_progress(device, seq, state);
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if (drbd_proc_details >= 1 && get_ldev_if_state(device, D_FAILED)) {
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lc_seq_printf_stats(seq, device->resync);
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lc_seq_printf_stats(seq, device->act_log);
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put_ldev(device);
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}
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if (drbd_proc_details >= 2)
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seq_printf(seq, "\tblocked on activity log: %d\n", atomic_read(&device->ap_actlog_cnt));
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}
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rcu_read_unlock();
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return 0;
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}
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