Commit 51edc20f authored by Lai Jiangshan's avatar Lai Jiangshan Committed by Luis Henriques

drbd: compute the end before rb_insert_augmented()

commit 82cfb90b 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@google.com>
Signed-off-by: default avatarLai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: default avatarAndreas Gruenbacher <agruen@linbit.com>
Signed-off-by: default avatarPhilipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 397c6bba
...@@ -79,6 +79,7 @@ bool ...@@ -79,6 +79,7 @@ bool
drbd_insert_interval(struct rb_root *root, struct drbd_interval *this) drbd_insert_interval(struct rb_root *root, struct drbd_interval *this)
{ {
struct rb_node **new = &root->rb_node, *parent = NULL; 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)); BUG_ON(!IS_ALIGNED(this->size, 512));
...@@ -87,6 +88,8 @@ drbd_insert_interval(struct rb_root *root, struct drbd_interval *this) ...@@ -87,6 +88,8 @@ drbd_insert_interval(struct rb_root *root, struct drbd_interval *this)
rb_entry(*new, struct drbd_interval, rb); rb_entry(*new, struct drbd_interval, rb);
parent = *new; parent = *new;
if (here->end < this_end)
here->end = this_end;
if (this->sector < here->sector) if (this->sector < here->sector)
new = &(*new)->rb_left; new = &(*new)->rb_left;
else if (this->sector > here->sector) else if (this->sector > here->sector)
...@@ -99,6 +102,7 @@ drbd_insert_interval(struct rb_root *root, struct drbd_interval *this) ...@@ -99,6 +102,7 @@ drbd_insert_interval(struct rb_root *root, struct drbd_interval *this)
return false; return false;
} }
this->end = this_end;
rb_link_node(&this->rb, parent, new); rb_link_node(&this->rb, parent, new);
rb_insert_augmented(&this->rb, root, &augment_callbacks); rb_insert_augmented(&this->rb, root, &augment_callbacks);
return true; return true;
......
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