From 3fa841d7e7266f6fcc1b3885b905f5153ba897d8 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Wed, 23 Sep 2009 18:10:29 +1000
Subject: md: report device as congested when suspended

This should writeback from coming when the device is temporarily
suspended.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 drivers/md/linear.c    | 3 +++
 drivers/md/md.c        | 6 ++++++
 drivers/md/md.h        | 1 +
 drivers/md/multipath.c | 3 +++
 drivers/md/raid0.c     | 3 +++
 drivers/md/raid1.c     | 3 +++
 drivers/md/raid10.c    | 2 ++
 drivers/md/raid5.c     | 3 +++
 8 files changed, 24 insertions(+)

(limited to 'drivers/md')

diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index ea4842905444..1ceceb334d5e 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -108,6 +108,9 @@ static int linear_congested(void *data, int bits)
 	linear_conf_t *conf;
 	int i, ret = 0;
 
+	if (mddev_congested(mddev, bits))
+		return 1;
+
 	rcu_read_lock();
 	conf = rcu_dereference(mddev->private);
 
diff --git a/drivers/md/md.c b/drivers/md/md.c
index a3dd3c8ea681..26ba42a79129 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -262,6 +262,12 @@ static void mddev_resume(mddev_t *mddev)
 	mddev->pers->quiesce(mddev, 0);
 }
 
+int mddev_congested(mddev_t *mddev, int bits)
+{
+	return mddev->suspended;
+}
+EXPORT_SYMBOL(mddev_congested);
+
 
 static inline mddev_t *mddev_get(mddev_t *mddev)
 {
diff --git a/drivers/md/md.h b/drivers/md/md.h
index f55d2ff95133..f184b69ef337 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -430,6 +430,7 @@ extern void md_write_end(mddev_t *mddev);
 extern void md_done_sync(mddev_t *mddev, int blocks, int ok);
 extern void md_error(mddev_t *mddev, mdk_rdev_t *rdev);
 
+extern int mddev_congested(mddev_t *mddev, int bits);
 extern void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
 			   sector_t sector, int size, struct page *page);
 extern void md_super_wait(mddev_t *mddev);
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 94c21c11b9bc..dcbf9d35928b 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -199,6 +199,9 @@ static int multipath_congested(void *data, int bits)
 	multipath_conf_t *conf = mddev->private;
 	int i, ret = 0;
 
+	if (mddev_congested(mddev, bits))
+		return 1;
+
 	rcu_read_lock();
 	for (i = 0; i < mddev->raid_disks ; i++) {
 		mdk_rdev_t *rdev = rcu_dereference(conf->multipaths[i].rdev);
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 68a4d129206e..d3a4ce06015a 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -44,6 +44,9 @@ static int raid0_congested(void *data, int bits)
 	mdk_rdev_t **devlist = conf->devlist;
 	int i, ret = 0;
 
+	if (mddev_congested(mddev, bits))
+		return 1;
+
 	for (i = 0; i < mddev->raid_disks && !ret ; i++) {
 		struct request_queue *q = bdev_get_queue(devlist[i]->bdev);
 
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 7efdeb44097f..a1eb4e13a112 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -576,6 +576,9 @@ static int raid1_congested(void *data, int bits)
 	conf_t *conf = mddev->private;
 	int i, ret = 0;
 
+	if (mddev_congested(mddev, bits))
+		return 1;
+
 	rcu_read_lock();
 	for (i = 0; i < mddev->raid_disks; i++) {
 		mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 7872968fdfcc..191f42efecc2 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -631,6 +631,8 @@ static int raid10_congested(void *data, int bits)
 	conf_t *conf = mddev->private;
 	int i, ret = 0;
 
+	if (mddev_congested(mddev, bits))
+		return 1;
 	rcu_read_lock();
 	for (i = 0; i < mddev->raid_disks && ret == 0; i++) {
 		mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index bee3573ed1bd..9db84c98a41d 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3332,6 +3332,9 @@ static int raid5_congested(void *data, int bits)
 	/* No difference between reads and writes.  Just check
 	 * how busy the stripe_cache is
 	 */
+
+	if (mddev_congested(mddev, bits))
+		return 1;
 	if (conf->inactive_blocked)
 		return 1;
 	if (conf->quiesce)
-- 
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