drivers/block/drbd/drbd_proc.c - kernel/skids - 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);


 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	= 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",
 			    (unsigned long) Bit2KB(rs_left >> 10),
 			    (unsigned long) Bit2KB(mdev->rs_total >> 10));
 	else
 		seq_printf(seq, "(%lu/%lu)K",
 			    (unsigned long) Bit2KB(rs_left),
 			    (unsigned long) Bit2KB(mdev->rs_total));

 	if (mdev->state.conn == C_SYNC_TARGET)
 		seq_printf(seq, " queue_delay: %d.%d ms\n\t",
 			   mdev->data_delay / 1000,
 			   (mdev->data_delay % 1000) / 100);
 	else if (mdev->state.conn == C_SYNC_SOURCE)
 		seq_printf(seq, " delay_probe: %u\n\t", mdev->delay_seq);

 	/* 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);

 	if (mdev->state.conn == C_SYNC_TARGET) {
 		if (mdev->c_sync_rate > 1000)
 			seq_printf(seq, " want: %d,%03d",
 				   mdev->c_sync_rate / 1000, mdev->c_sync_rate % 1000);
 		else
 			seq_printf(seq, " want: %d", mdev->c_sync_rate);
 	}

 	seq_printf(seq, " K/sec\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, 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", P_BARRIER_ACK 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 = 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 {
 			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,
 			   drbd_role_str(mdev->state.role),
 			   drbd_role_str(mdev->state.peer),
 			   drbd_disk_str(mdev->state.disk),
 			   drbd_disk_str(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 == C_SYNC_SOURCE ||
 		    mdev->state.conn == C_SYNC_TARGET)
 			drbd_syncer_progress(mdev, seq);

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

 		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);
 			}
 		}
 	}

 	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 */
	/*
	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);


	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 = 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",
	(unsigned long) Bit2KB(rs_left >> 10),
	(unsigned long) Bit2KB(mdev->rs_total >> 10));
	else
	seq_printf(seq, "(%lu/%lu)K",
	(unsigned long) Bit2KB(rs_left),
	(unsigned long) Bit2KB(mdev->rs_total));

	if (mdev->state.conn == C_SYNC_TARGET)
	seq_printf(seq, " queue_delay: %d.%d ms\n\t",
	mdev->data_delay / 1000,
	(mdev->data_delay % 1000) / 100);
	else if (mdev->state.conn == C_SYNC_SOURCE)
	seq_printf(seq, " delay_probe: %u\n\t", mdev->delay_seq);

	/* 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);

	if (mdev->state.conn == C_SYNC_TARGET) {
	if (mdev->c_sync_rate > 1000)
	seq_printf(seq, " want: %d,%03d",
	mdev->c_sync_rate / 1000, mdev->c_sync_rate % 1000);
	else
	seq_printf(seq, " want: %d", mdev->c_sync_rate);
	}

	seq_printf(seq, " K/sec\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, 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", P_BARRIER_ACK 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 = 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 {
	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,
	drbd_role_str(mdev->state.role),
	drbd_role_str(mdev->state.peer),
	drbd_disk_str(mdev->state.disk),
	drbd_disk_str(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 == C_SYNC_SOURCE \|\|
	mdev->state.conn == C_SYNC_TARGET)
	drbd_syncer_progress(mdev, seq);

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

	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);
	}
	}
	}

	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 */