linux-kernel - [PATCH 3.17 092/319] drbd: compute the end before rb_insert

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Message-Id: <20141112011007.775353285@linuxfoundation.org>
Date:	Wed, 12 Nov 2014 10:13:50 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Michel Lespinasse <walken@...gle.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Andreas Gruenbacher <agruen@...bit.com>,
	Philipp Reisner <philipp.reisner@...bit.com>,
	Jens Axboe <axboe@...com>
Subject: [PATCH 3.17 092/319] drbd: compute the end before rb_insert_augmented()

3.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lai Jiangshan <laijs@...fujitsu.com>

commit 82cfb90bc99d7b7e0ec62d0505b9d4f06805d5db upstream.

Commit 98683650 "Merge branch 'drbd-8.4_ed6' into
for-3.8-drivers-drbd-8.4_ed6" switches to the new augment API, but the
new API requires that the tree is augmented before rb_insert_augmented()
is called, which is missing.

So we add the augment-code to drbd_insert_interval() when it travels the
tree up to down before rb_insert_augmented().  See the example in
include/linux/interval_tree_generic.h or Documentation/rbtree.txt.

drbd_insert_interval() may cancel the insertion when traveling, in this
case, the just added augment-code does nothing before cancel since the
@this node is already in the subtrees in this case.

CC: Michel Lespinasse <walken@...gle.com>
Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
Signed-off-by: Andreas Gruenbacher <agruen@...bit.com>
Signed-off-by: Philipp Reisner <philipp.reisner@...bit.com>
Signed-off-by: Jens Axboe <axboe@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/block/drbd/drbd_interval.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/block/drbd/drbd_interval.c
+++ b/drivers/block/drbd/drbd_interval.c
@@ -79,6 +79,7 @@ bool
 drbd_insert_interval(struct rb_root *root, struct drbd_interval *this)
 {
 	struct rb_node **new = &root->rb_node, *parent = NULL;
+	sector_t this_end = this->sector + (this->size >> 9);
 
 	BUG_ON(!IS_ALIGNED(this->size, 512));
 
@@ -87,6 +88,8 @@ drbd_insert_interval(struct rb_root *roo
 			rb_entry(*new, struct drbd_interval, rb);
 
 		parent = *new;
+		if (here->end < this_end)
+			here->end = this_end;
 		if (this->sector < here->sector)
 			new = &(*new)->rb_left;
 		else if (this->sector > here->sector)
@@ -99,6 +102,7 @@ drbd_insert_interval(struct rb_root *roo
 			return false;
 	}
 
+	this->end = this_end;
 	rb_link_node(&this->rb, parent, new);
 	rb_insert_augmented(&this->rb, root, &augment_callbacks);
 	return true;


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