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Subject[PATCH 09/12] DRBD: proc
Date
The /proc/drbd interface.

---
diff -uNrp linux-2.6.29-rc8/drivers/block/drbd/drbd_proc.c linux-2.6.29-rc8-drbd/drivers/block/drbd/drbd_proc.c
--- linux-2.6.29-rc8/drivers/block/drbd/drbd_proc.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.29-rc8-drbd/drivers/block/drbd/drbd_proc.c 2009-03-23 11:25:50.360135000 +0100
@@ -0,0 +1,273 @@
+/*
+-*- linux-c -*-
+ drbd_proc.c
+ Kernel module for 2.6.x Kernels
+
+ 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/autoconf.h>
+#include <linux/module.h>
+
+#include <asm/uaccess.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/slab.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/drbd.h>
+#include "drbd_int.h"
+#include "lru_cache.h" /* for lc_sprintf_stats */
+
+STATIC int drbd_proc_open(struct inode *inode, struct file *file);
+
+
+struct proc_dir_entry *drbd_proc;
+struct file_operations drbd_proc_fops = {
+ .owner = THIS_MODULE,
+ .open = drbd_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+
+/*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_conf *mdev, struct seq_file *seq)
+{
+ unsigned long db, dt, dbdt, rt, rs_left;
+ unsigned int res;
+ int i, x, y;
+
+ drbd_get_syncer_progress(mdev, &rs_left, &res);
+
+ x = res/50;
+ y = 20-x;
+ seq_printf(seq, "\t[");
+ for (i = 1; i < x; i++)
+ seq_printf(seq, "=");
+ seq_printf(seq, ">");
+ for (i = 0; i < y; i++)
+ seq_printf(seq, ".");
+ seq_printf(seq, "] ");
+
+ seq_printf(seq, "sync'ed:%3u.%u%% ", res / 10, res % 10);
+ /* if more than 1 GB display in MB */
+ if (mdev->rs_total > 0x100000L)
+ seq_printf(seq, "(%lu/%lu)M\n\t",
+ (unsigned long) Bit2KB(rs_left >> 10),
+ (unsigned long) Bit2KB(mdev->rs_total >> 10));
+ else
+ seq_printf(seq, "(%lu/%lu)K\n\t",
+ (unsigned long) Bit2KB(rs_left),
+ (unsigned long) Bit2KB(mdev->rs_total));
+
+ /* 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
+ */
+ dt = (jiffies - mdev->rs_mark_time) / HZ;
+
+ if (dt > 20) {
+ /* if we made no update to rs_mark_time for too long,
+ * we are stalled. show that. */
+ seq_printf(seq, "stalled\n");
+ return;
+ }
+
+ if (!dt)
+ dt++;
+ db = mdev->rs_mark_left - 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);
+
+ /* current speed average over (SYNC_MARKS * SYNC_MARK_STEP) jiffies */
+ dbdt = Bit2KB(db/dt);
+ if (dbdt > 1000)
+ seq_printf(seq, " speed: %ld,%03ld",
+ dbdt/1000, dbdt % 1000);
+ else
+ seq_printf(seq, " speed: %ld", dbdt);
+
+ /* mean speed since syncer started
+ * we do account for PausedSync periods */
+ dt = (jiffies - mdev->rs_start - mdev->rs_paused) / HZ;
+ if (dt <= 0)
+ dt = 1;
+ db = mdev->rs_total - rs_left;
+ dbdt = Bit2KB(db/dt);
+ if (dbdt > 1000)
+ seq_printf(seq, " (%ld,%03ld)",
+ dbdt/1000, dbdt % 1000);
+ else
+ seq_printf(seq, " (%ld)", dbdt);
+
+ seq_printf(seq, " K/sec\n");
+}
+
+#ifdef ENABLE_DYNAMIC_TRACE
+STATIC void resync_dump_detail(struct seq_file *seq, struct lc_element *e)
+{
+ struct bm_extent *bme = (struct bm_extent *)e;
+
+ seq_printf(seq, "%5d %s %s\n", bme->rs_left,
+ bme->flags & BME_NO_WRITES ? "NO_WRITES" : "---------",
+ bme->flags & BME_LOCKED ? "LOCKED" : "------"
+ );
+}
+#endif
+
+STATIC int drbd_seq_show(struct seq_file *seq, void *v)
+{
+ int i, hole = 0;
+ const char *sn;
+ struct drbd_conf *mdev;
+
+ static char write_ordering_chars[] = {
+ [WO_none] = 'n',
+ [WO_drain_io] = 'd',
+ [WO_bdev_flush] = 'f',
+ [WO_bio_barrier] = 'b',
+ };
+
+ seq_printf(seq, "version: " REL_VERSION " (api:%d/proto:%d-%d)\n%s\n",
+ API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX, drbd_buildtag());
+
+ /*
+ cs .. connection state
+ ro .. node role (local/remote)
+ ds .. disk state (local/remote)
+ protocol
+ various flags
+ ns .. network send
+ nr .. network receive
+ dw .. disk write
+ dr .. disk read
+ al .. activity log write count
+ bm .. bitmap update write count
+ pe .. pending (waiting for ack or data reply)
+ ua .. unack'd (still need to send ack or data reply)
+ ap .. application requests accepted, but not yet completed
+ ep .. number of epochs currently "on the fly", BarrierAck pending
+ wo .. write ordering mode currently in use
+ oos .. known out-of-sync kB
+ */
+
+ for (i = 0; i < minor_count; i++) {
+ mdev = minor_to_mdev(i);
+ if (!mdev) {
+ hole = 1;
+ continue;
+ }
+ if (hole) {
+ hole = 0;
+ seq_printf(seq, "\n");
+ }
+
+ sn = conns_to_name(mdev->state.conn);
+
+ if (mdev->state.conn == StandAlone &&
+ mdev->state.disk == Diskless &&
+ mdev->state.role == Secondary) {
+ seq_printf(seq, "%2d: cs:Unconfigured\n", i);
+ } else {
+ seq_printf(seq,
+ "%2d: cs:%s ro:%s/%s ds:%s/%s %c %c%c%c%c%c\n"
+ " ns:%u nr:%u dw:%u dr:%u al:%u bm:%u "
+ "lo:%d pe:%d ua:%d ap:%d ep:%d wo:%c",
+ i, sn,
+ roles_to_name(mdev->state.role),
+ roles_to_name(mdev->state.peer),
+ disks_to_name(mdev->state.disk),
+ disks_to_name(mdev->state.pdsk),
+ (mdev->net_conf == NULL ? ' ' :
+ (mdev->net_conf->wire_protocol - DRBD_PROT_A+'A')),
+ mdev->state.susp ? 's' : 'r',
+ mdev->state.aftr_isp ? 'a' : '-',
+ mdev->state.peer_isp ? 'p' : '-',
+ mdev->state.user_isp ? 'u' : '-',
+ mdev->congestion_reason,
+ mdev->send_cnt/2,
+ mdev->recv_cnt/2,
+ mdev->writ_cnt/2,
+ mdev->read_cnt/2,
+ mdev->al_writ_cnt,
+ mdev->bm_writ_cnt,
+ atomic_read(&mdev->local_cnt),
+ atomic_read(&mdev->ap_pending_cnt) +
+ atomic_read(&mdev->rs_pending_cnt),
+ atomic_read(&mdev->unacked_cnt),
+ atomic_read(&mdev->ap_bio_cnt),
+ mdev->epochs,
+ write_ordering_chars[mdev->write_ordering]
+ );
+ seq_printf(seq, " oos:%lu\n",
+ Bit2KB(drbd_bm_total_weight(mdev)));
+ }
+ if (mdev->state.conn == SyncSource ||
+ mdev->state.conn == SyncTarget)
+ drbd_syncer_progress(mdev, seq);
+
+ if (mdev->state.conn == VerifyS || mdev->state.conn == VerifyT)
+ seq_printf(seq, "\t%3d%% %lu/%lu\n",
+ (int)((mdev->rs_total-mdev->ov_left) /
+ (mdev->rs_total/100+1)),
+ mdev->rs_total - mdev->ov_left,
+ mdev->rs_total);
+
+#ifdef ENABLE_DYNAMIC_TRACE
+ if (proc_details >= 1 && inc_local_if_state(mdev, Failed)) {
+ lc_printf_stats(seq, mdev->resync);
+ lc_printf_stats(seq, mdev->act_log);
+ dec_local(mdev);
+ }
+
+ if (proc_details >= 2) {
+ if (mdev->resync) {
+ lc_dump(mdev->resync, seq, "rs_left",
+ resync_dump_detail);
+ }
+ }
+#endif
+ }
+
+ return 0;
+}
+
+STATIC int drbd_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, drbd_seq_show, PDE(inode)->data);
+}
+
+/* PROC FS stuff end */

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