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/*
drbd_proc.c
This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
drbd is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
drbd is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with drbd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/drbd.h>
#include "drbd_int.h"
static int drbd_proc_open(struct inode *inode, struct file *file);
static int drbd_proc_release(struct inode *inode, struct file *file);
struct proc_dir_entry *drbd_proc;
const struct file_operations drbd_proc_fops = {
.owner = THIS_MODULE,
.open = drbd_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = drbd_proc_release,
};
static void seq_printf_with_thousands_grouping(struct seq_file *seq, long v)
{
/* v is in kB/sec. We don't expect TiByte/sec yet. */
if (unlikely(v >= 1000000)) {
/* cool: > GiByte/s */
seq_printf(seq, "%ld,", v / 1000000);
v %= 1000000;
seq_printf(seq, "%03ld,%03ld", v/1000, v % 1000);
} else if (likely(v >= 1000))
seq_printf(seq, "%ld,%03ld", v/1000, v % 1000);
else
seq_printf(seq, "%ld", v);
}
static void drbd_get_syncer_progress(struct drbd_device *device,
union drbd_dev_state state, unsigned long *rs_total,
unsigned long *bits_left, unsigned int *per_mil_done)
{
/* this is to break it at compile time when we change that, in case we
* want to support more than (1<<32) bits on a 32bit arch. */
typecheck(unsigned long, device->rs_total);
*rs_total = device->rs_total;
/* note: both rs_total and rs_left are in bits, i.e. in
* units of BM_BLOCK_SIZE.
* for the percentage, we don't care. */
if (state.conn == C_VERIFY_S || state.conn == C_VERIFY_T)
*bits_left = device->ov_left;
else
*bits_left = drbd_bm_total_weight(device) - device->rs_failed;
/* >> 10 to prevent overflow,
* +1 to prevent division by zero */
if (*bits_left > *rs_total) {
/* D'oh. Maybe a logic bug somewhere. More likely just a race
* between state change and reset of rs_total.
*/
*bits_left = *rs_total;
*per_mil_done = *rs_total ? 0 : 1000;
} else {
/* Make sure the division happens in long context.
* We allow up to one petabyte storage right now,
* at a granularity of 4k per bit that is 2**38 bits.
* After shift right and multiplication by 1000,
* this should still fit easily into a 32bit long,
* so we don't need a 64bit division on 32bit arch.
* Note: currently we don't support such large bitmaps on 32bit
* arch anyways, but no harm done to be prepared for it here.
*/
unsigned int shift = *rs_total > UINT_MAX ? 16 : 10;
unsigned long left = *bits_left >> shift;
unsigned long total = 1UL + (*rs_total >> shift);
unsigned long tmp = 1000UL - left * 1000UL/total;
*per_mil_done = tmp;
}
}
/*lge
* progress bars shamelessly adapted from driver/md/md.c
* output looks like
* [=====>..............] 33.5% (23456/123456)
* finish: 2:20:20 speed: 6,345 (6,456) K/sec
*/
static void drbd_syncer_progress(struct drbd_device *device, struct seq_file *seq,
union drbd_dev_state state)
{
unsigned long db, dt, dbdt, rt, rs_total, rs_left;
unsigned int res;
int i, x, y;
int stalled = 0;
drbd_get_syncer_progress(device, state, &rs_total, &rs_left, &res);
x = res/50;
y = 20-x;
seq_puts(seq, "\t[");
for (i = 1; i < x; i++)
seq_putc(seq, '=');
seq_putc(seq, '>');
for (i = 0; i < y; i++)
seq_putc(seq, '.');
seq_puts(seq, "] ");
if (state.conn == C_VERIFY_S || state.conn == C_VERIFY_T)
seq_puts(seq, "verified:");
else
seq_puts(seq, "sync'ed:");
seq_printf(seq, "%3u.%u%% ", res / 10, res % 10);
/* if more than a few GB, display in MB */
if (rs_total > (4UL << (30 - BM_BLOCK_SHIFT)))
seq_printf(seq, "(%lu/%lu)M",
(unsigned long) Bit2KB(rs_left >> 10),
(unsigned long) Bit2KB(rs_total >> 10));
else
seq_printf(seq, "(%lu/%lu)K",
(unsigned long) Bit2KB(rs_left),
(unsigned long) Bit2KB(rs_total));
seq_puts(seq, "\n\t");
/* see drivers/md/md.c
* We do not want to overflow, so the order of operands and
* the * 100 / 100 trick are important. We do a +1 to be
* safe against division by zero. We only estimate anyway.
*
* dt: time from mark until now
* db: blocks written from mark until now
* rt: remaining time
*/
/* Rolling marks. last_mark+1 may just now be modified. last_mark+2 is
* at least (DRBD_SYNC_MARKS-2)*DRBD_SYNC_MARK_STEP old, and has at
* least DRBD_SYNC_MARK_STEP time before it will be modified. */
/* ------------------------ ~18s average ------------------------ */
i = (device->rs_last_mark + 2) % DRBD_SYNC_MARKS;
dt = (jiffies - device->rs_mark_time[i]) / HZ;
if (dt > 180)
stalled = 1;
if (!dt)
dt++;
db = device->rs_mark_left[i] - rs_left;
rt = (dt * (rs_left / (db/100+1)))/100; /* seconds */
seq_printf(seq, "finish: %lu:%02lu:%02lu",
rt / 3600, (rt % 3600) / 60, rt % 60);
dbdt = Bit2KB(db/dt);
seq_puts(seq, " speed: ");
seq_printf_with_thousands_grouping(seq, dbdt);
seq_puts(seq, " (");
/* ------------------------- ~3s average ------------------------ */
if (drbd_proc_details >= 1) {
/* this is what drbd_rs_should_slow_down() uses */
i = (device->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS;
dt = (jiffies - device->rs_mark_time[i]) / HZ;
if (!dt)
dt++;
db = device->rs_mark_left[i] - rs_left;
dbdt = Bit2KB(db/dt);
seq_printf_with_thousands_grouping(seq, dbdt);
seq_puts(seq, " -- ");
}
/* --------------------- long term average ---------------------- */
/* mean speed since syncer started
* we do account for PausedSync periods */
dt = (jiffies - device->rs_start - device->rs_paused) / HZ;
if (dt == 0)
dt = 1;
db = rs_total - rs_left;
dbdt = Bit2KB(db/dt);
seq_printf_with_thousands_grouping(seq, dbdt);
seq_putc(seq, ')');
if (state.conn == C_SYNC_TARGET ||
state.conn == C_VERIFY_S) {
seq_puts(seq, " want: ");
seq_printf_with_thousands_grouping(seq, device->c_sync_rate);
}
seq_printf(seq, " K/sec%s\n", stalled ? " (stalled)" : "");
if (drbd_proc_details >= 1) {
/* 64 bit:
* we convert to sectors in the display below. */
unsigned long bm_bits = drbd_bm_bits(device);
unsigned long bit_pos;
unsigned long long stop_sector = 0;
if (state.conn == C_VERIFY_S ||
state.conn == C_VERIFY_T) {
bit_pos = bm_bits - device->ov_left;
if (verify_can_do_stop_sector(device))
stop_sector = device->ov_stop_sector;
} else
bit_pos = device->bm_resync_fo;
/* Total sectors may be slightly off for oddly
* sized devices. So what. */
seq_printf(seq,
"\t%3d%% sector pos: %llu/%llu",
(int)(bit_pos / (bm_bits/100+1)),
(unsigned long long)bit_pos * BM_SECT_PER_BIT,
(unsigned long long)bm_bits * BM_SECT_PER_BIT);
if (stop_sector != 0 && stop_sector
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