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323 lines
9.8 KiB
323 lines
9.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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 <[email protected]>. |
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Copyright (C) 2002-2008, Lars Ellenberg <[email protected]>. |
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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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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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