drivers/block/drbd/drbd_proc.c - arm/linux - Git at Google


            
            /*

            
               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 <asm/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,

            
            };


            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);

            
            }


            /*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;

            
            	int stalled = 0;


            	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, "] ");


            	if (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T)

            
            		seq_printf(seq, "verified:");

            
            	else

            
            		seq_printf(seq, "sync'ed:");

            
            	seq_printf(seq, "%3u.%u%% ", res / 10, res % 10);


            	/* if more than a few GB, display in MB */

            
            	if (mdev->rs_total > (4UL << (30 - BM_BLOCK_SHIFT)))

            
            		seq_printf(seq, "(%lu/%lu)M",

            
            			    (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

            
            	 */

            
            	/* 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 = (mdev->rs_last_mark + 2) % DRBD_SYNC_MARKS;

            
            	dt = (jiffies - mdev->rs_mark_time[i]) / HZ;

            
            	if (dt > (DRBD_SYNC_MARK_STEP * DRBD_SYNC_MARKS))

            
            		stalled = 1;


            	if (!dt)

            
            		dt++;

            
            	db = mdev->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_printf(seq, " speed: ");

            
            	seq_printf_with_thousands_grouping(seq, dbdt);

            
            	seq_printf(seq, " (");

            
            	/* ------------------------- ~3s average ------------------------ */

            
            	if (proc_details >= 1) {

            
            		/* this is what drbd_rs_should_slow_down() uses */

            
            		i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS;

            
            		dt = (jiffies - mdev->rs_mark_time[i]) / HZ;

            
            		if (!dt)

            
            			dt++;

            
            		db = mdev->rs_mark_left[i] - rs_left;

            
            		dbdt = Bit2KB(db/dt);

            
            		seq_printf_with_thousands_grouping(seq, dbdt);

            
            		seq_printf(seq, " -- ");

            
            	}


            	/* --------------------- long term average ---------------------- */

            
            	/* 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);

            
            	seq_printf_with_thousands_grouping(seq, dbdt);

            
            	seq_printf(seq, ")");


            	if (mdev->state.conn == C_SYNC_TARGET ||

            
            	    mdev->state.conn == C_VERIFY_S) {

            
            		seq_printf(seq, " want: ");

            
            		seq_printf_with_thousands_grouping(seq, mdev->c_sync_rate);

            
            	}

            
            	seq_printf(seq, " K/sec%s\n", stalled ? " (stalled)" : "");


            	if (proc_details >= 1) {

            
            		/* 64 bit:

            
            		 * we convert to sectors in the display below. */

            
            		unsigned long bm_bits = drbd_bm_bits(mdev);

            
            		unsigned long bit_pos;

            
            		unsigned long long stop_sector = 0;

            
            		if (mdev->state.conn == C_VERIFY_S ||

            
            		    mdev->state.conn == C_VERIFY_T) {

            
            			bit_pos = bm_bits - mdev->ov_left;

            
            			if (verify_can_do_stop_sector(mdev))

            
            				stop_sector = mdev->ov_stop_sector;

            
            		} else

            
            			bit_pos = mdev->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 != ULLONG_MAX)

            
            			seq_printf(seq, " stop sector: %llu", stop_sector);

            
            		seq_printf(seq, "\n");

            
            	}

            
            }


            static void resync_dump_detail(struct seq_file *seq, struct lc_element *e)

            
            {

            
            	struct bm_extent *bme = lc_entry(e, struct bm_extent, lce);


            	seq_printf(seq, "%5d %s %s\n", bme->rs_left,

            
            		   bme->flags & BME_NO_WRITES ? "NO_WRITES" : "---------",

            
            		   bme->flags & BME_LOCKED ? "LOCKED" : "------"

            
            		   );

            
            }


            static int drbd_seq_show(struct seq_file *seq, void *v)

            
            {

            
            	int i, prev_i = -1;

            
            	const char *sn;

            
            	struct drbd_conf *mdev;

            
            	struct net_conf *nc;

            
            	char wp;


            	static char write_ordering_chars[] = {

            
            		[WO_none] = 'n',

            
            		[WO_drain_io] = 'd',

            
            		[WO_bdev_flush] = 'f',

            
            	};


            	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", P_BARRIER_ACK pending

            
            	  wo .. write ordering mode currently in use

            
            	 oos .. known out-of-sync kB

            
            	*/


            	rcu_read_lock();

            
            	idr_for_each_entry(&minors, mdev, i) {

            
            		if (prev_i != i - 1)

            
            			seq_printf(seq, "\n");

            
            		prev_i = i;


            		sn = drbd_conn_str(mdev->state.conn);


            		if (mdev->state.conn == C_STANDALONE &&

            
            		    mdev->state.disk == D_DISKLESS &&

            
            		    mdev->state.role == R_SECONDARY) {

            
            			seq_printf(seq, "%2d: cs:Unconfigured\n", i);

            
            		} else {

            
            			/* reset mdev->congestion_reason */

            
            			bdi_rw_congested(&mdev->rq_queue->backing_dev_info);


            			nc = rcu_dereference(mdev->tconn->net_conf);

            
            			wp = nc ? nc->wire_protocol - DRBD_PROT_A + 'A' : ' ';

            
            			seq_printf(seq,

            
            			   "%2d: cs:%s ro:%s/%s ds:%s/%s %c %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,

            
            			   drbd_role_str(mdev->state.role),

            
            			   drbd_role_str(mdev->state.peer),

            
            			   drbd_disk_str(mdev->state.disk),

            
            			   drbd_disk_str(mdev->state.pdsk),

            
            			   wp,

            
            			   drbd_suspended(mdev) ? 's' : 'r',

            
            			   mdev->state.aftr_isp ? 'a' : '-',

            
            			   mdev->state.peer_isp ? 'p' : '-',

            
            			   mdev->state.user_isp ? 'u' : '-',

            
            			   mdev->congestion_reason ?: '-',

            
            			   test_bit(AL_SUSPENDED, &mdev->flags) ? 's' : '-',

            
            			   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->tconn->epochs,

            
            			   write_ordering_chars[mdev->tconn->write_ordering]

            
            			);

            
            			seq_printf(seq, " oos:%llu\n",

            
            				   Bit2KB((unsigned long long)

            
            					   drbd_bm_total_weight(mdev)));

            
            		}

            
            		if (mdev->state.conn == C_SYNC_SOURCE ||

            
            		    mdev->state.conn == C_SYNC_TARGET ||

            
            		    mdev->state.conn == C_VERIFY_S ||

            
            		    mdev->state.conn == C_VERIFY_T)

            
            			drbd_syncer_progress(mdev, seq);


            		if (proc_details >= 1 && get_ldev_if_state(mdev, D_FAILED)) {

            
            			lc_seq_printf_stats(seq, mdev->resync);

            
            			lc_seq_printf_stats(seq, mdev->act_log);

            
            			put_ldev(mdev);

            
            		}


            		if (proc_details >= 2) {

            
            			if (mdev->resync) {

            
            				lc_seq_dump_details(seq, mdev->resync, "rs_left",

            
            					resync_dump_detail);

            
            			}

            
            		}

            
            	}

            
            	rcu_read_unlock();


            	return 0;

            
            }


            static int drbd_proc_open(struct inode *inode, struct file *file)

            
            {

            
            	int err;


            	if (try_module_get(THIS_MODULE)) {

            
            		err = single_open(file, drbd_seq_show, PDE_DATA(inode));

            
            		if (err)

            
            			module_put(THIS_MODULE);

            
            		return err;

            
            	}

            
            	return -ENODEV;

            
            }


            static int drbd_proc_release(struct inode *inode, struct file *file)

            
            {

            
            	module_put(THIS_MODULE);

            
            	return single_release(inode, file);

            
            }


            /* PROC FS stuff end */
	/*
	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 <asm/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,
	};

	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);
	}

	/*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;
	int stalled = 0;

	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, "] ");

	if (mdev->state.conn == C_VERIFY_S \|\| mdev->state.conn == C_VERIFY_T)
	seq_printf(seq, "verified:");
	else
	seq_printf(seq, "sync'ed:");
	seq_printf(seq, "%3u.%u%% ", res / 10, res % 10);

	/* if more than a few GB, display in MB */
	if (mdev->rs_total > (4UL << (30 - BM_BLOCK_SHIFT)))
	seq_printf(seq, "(%lu/%lu)M",
	(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
	*/
	/* 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 = (mdev->rs_last_mark + 2) % DRBD_SYNC_MARKS;
	dt = (jiffies - mdev->rs_mark_time[i]) / HZ;
	if (dt > (DRBD_SYNC_MARK_STEP * DRBD_SYNC_MARKS))
	stalled = 1;

	if (!dt)
	dt++;
	db = mdev->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_printf(seq, " speed: ");
	seq_printf_with_thousands_grouping(seq, dbdt);
	seq_printf(seq, " (");
	/* ------------------------- ~3s average ------------------------ */
	if (proc_details >= 1) {
	/* this is what drbd_rs_should_slow_down() uses */
	i = (mdev->rs_last_mark + DRBD_SYNC_MARKS-1) % DRBD_SYNC_MARKS;
	dt = (jiffies - mdev->rs_mark_time[i]) / HZ;
	if (!dt)
	dt++;
	db = mdev->rs_mark_left[i] - rs_left;
	dbdt = Bit2KB(db/dt);
	seq_printf_with_thousands_grouping(seq, dbdt);
	seq_printf(seq, " -- ");
	}

	/* --------------------- long term average ---------------------- */
	/* 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);
	seq_printf_with_thousands_grouping(seq, dbdt);
	seq_printf(seq, ")");

	if (mdev->state.conn == C_SYNC_TARGET \|\|
	mdev->state.conn == C_VERIFY_S) {
	seq_printf(seq, " want: ");
	seq_printf_with_thousands_grouping(seq, mdev->c_sync_rate);
	}
	seq_printf(seq, " K/sec%s\n", stalled ? " (stalled)" : "");

	if (proc_details >= 1) {
	/* 64 bit:
	* we convert to sectors in the display below. */
	unsigned long bm_bits = drbd_bm_bits(mdev);
	unsigned long bit_pos;
	unsigned long long stop_sector = 0;
	if (mdev->state.conn == C_VERIFY_S \|\|
	mdev->state.conn == C_VERIFY_T) {
	bit_pos = bm_bits - mdev->ov_left;
	if (verify_can_do_stop_sector(mdev))
	stop_sector = mdev->ov_stop_sector;
	} else
	bit_pos = mdev->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 != ULLONG_MAX)
	seq_printf(seq, " stop sector: %llu", stop_sector);
	seq_printf(seq, "\n");
	}
	}

	static void resync_dump_detail(struct seq_file seq, struct lc_element e)
	{
	struct bm_extent *bme = lc_entry(e, struct bm_extent, lce);

	seq_printf(seq, "%5d %s %s\n", bme->rs_left,
	bme->flags & BME_NO_WRITES ? "NO_WRITES" : "---------",
	bme->flags & BME_LOCKED ? "LOCKED" : "------"
	);
	}

	static int drbd_seq_show(struct seq_file seq, void v)
	{
	int i, prev_i = -1;
	const char *sn;
	struct drbd_conf *mdev;
	struct net_conf *nc;
	char wp;

	static char write_ordering_chars[] = {
	[WO_none] = 'n',
	[WO_drain_io] = 'd',
	[WO_bdev_flush] = 'f',
	};

	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", P_BARRIER_ACK pending
	wo .. write ordering mode currently in use
	oos .. known out-of-sync kB
	*/

	rcu_read_lock();
	idr_for_each_entry(&minors, mdev, i) {
	if (prev_i != i - 1)
	seq_printf(seq, "\n");
	prev_i = i;

	sn = drbd_conn_str(mdev->state.conn);

	if (mdev->state.conn == C_STANDALONE &&
	mdev->state.disk == D_DISKLESS &&
	mdev->state.role == R_SECONDARY) {
	seq_printf(seq, "%2d: cs:Unconfigured\n", i);
	} else {
	/* reset mdev->congestion_reason */
	bdi_rw_congested(&mdev->rq_queue->backing_dev_info);

	nc = rcu_dereference(mdev->tconn->net_conf);
	wp = nc ? nc->wire_protocol - DRBD_PROT_A + 'A' : ' ';
	seq_printf(seq,
	"%2d: cs:%s ro:%s/%s ds:%s/%s %c %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,
	drbd_role_str(mdev->state.role),
	drbd_role_str(mdev->state.peer),
	drbd_disk_str(mdev->state.disk),
	drbd_disk_str(mdev->state.pdsk),
	wp,
	drbd_suspended(mdev) ? 's' : 'r',
	mdev->state.aftr_isp ? 'a' : '-',
	mdev->state.peer_isp ? 'p' : '-',
	mdev->state.user_isp ? 'u' : '-',
	mdev->congestion_reason ?: '-',
	test_bit(AL_SUSPENDED, &mdev->flags) ? 's' : '-',
	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->tconn->epochs,
	write_ordering_chars[mdev->tconn->write_ordering]
	);
	seq_printf(seq, " oos:%llu\n",
	Bit2KB((unsigned long long)
	drbd_bm_total_weight(mdev)));
	}
	if (mdev->state.conn == C_SYNC_SOURCE \|\|
	mdev->state.conn == C_SYNC_TARGET \|\|
	mdev->state.conn == C_VERIFY_S \|\|
	mdev->state.conn == C_VERIFY_T)
	drbd_syncer_progress(mdev, seq);

	if (proc_details >= 1 && get_ldev_if_state(mdev, D_FAILED)) {
	lc_seq_printf_stats(seq, mdev->resync);
	lc_seq_printf_stats(seq, mdev->act_log);
	put_ldev(mdev);
	}

	if (proc_details >= 2) {
	if (mdev->resync) {
	lc_seq_dump_details(seq, mdev->resync, "rs_left",
	resync_dump_detail);
	}
	}
	}
	rcu_read_unlock();

	return 0;
	}

	static int drbd_proc_open(struct inode inode, struct file file)
	{
	int err;

	if (try_module_get(THIS_MODULE)) {
	err = single_open(file, drbd_seq_show, PDE_DATA(inode));
	if (err)
	module_put(THIS_MODULE);
	return err;
	}
	return -ENODEV;
	}

	static int drbd_proc_release(struct inode inode, struct file file)
	{
	module_put(THIS_MODULE);
	return single_release(inode, file);
	}

	/* PROC FS stuff end */