#include "drbd_interval.h"
/**
* interval_end - return end of @node
*/
static inline
sector_t interval_end(struct rb_node *node)
{
struct drbd_interval *this = rb_entry(node, struct drbd_interval, rb);
return this->end;
}
/**
* update_interval_end - recompute end of @node
*
* The end of an interval is the highest (start + (size >> 9)) value of this
* node and of its children. Called for @node and its parents whenever the end
* may have changed.
*/
static void
update_interval_end(struct rb_node *node, void *__unused)
{
struct drbd_interval *this = rb_entry(node, struct drbd_interval, rb);
sector_t end;
end = this->sector + (this->size >> 9);
if (node->rb_left) {
sector_t left = interval_end(node->rb_left);
if (left > end)
end = left;
}
if (node->rb_right) {
sector_t right = interval_end(node->rb_right);
if (right > end)
end = right;
}
this->end = end;
}
/**
* drbd_insert_interval - insert a new interval into a tree
*/
bool
drbd_insert_interval(struct rb_root *root, struct drbd_interval *this)
{
struct rb_node **new = &root->rb_node, *parent = NULL;
BUG_ON(!IS_ALIGNED(this->size, 512));
while (*new) {
struct drbd_interval *here =
rb_entry(*new, struct drbd_interval, rb);
parent = *new;
if (this->sector < here->sector)
new = &(*new)->rb_left;
else if (this->sector > here->sector)
new = &(*new)->rb_right;
else if (this < here)
new = &(*new)->rb_left;
else if (this->sector > here->sector)
new = &(*new)->rb_right;
return false;
}
rb_link_node(&this->rb, parent, new);
rb_insert_color(&this->rb, root);
rb_augment_insert(&this->rb, update_interval_end, NULL);
return true;
}
/**
* drbd_contains_interval - check if a tree contains a given interval
* @sector: start sector of @interval
* @interval: may not be a valid pointer
*
* Returns if the tree contains the node @interval with start sector @start.
* Does not dereference @interval until @interval is known to be a valid object
* in @tree. Returns %false if @interval is in the tree but with a different
* sector number.
*/
bool
drbd_contains_interval(struct rb_root *root, sector_t sector,
struct drbd_interval *interval)
{
struct rb_node *node = root->rb_node;
while (node) {
struct drbd_interval *here =
rb_entry(node, struct drbd_interval, rb);
if (sector < here->sector)
node = node->rb_left;
else if (sector > here->sector)
node = node->rb_right;
else if (interval < here)
node = node->rb_left;
else if (interval > here)
node = node->rb_right;
else
return interval->sector == sector;
}
return false;
}
/**
* drbd_remove_interval - remove an interval from a tree
*/
void
drbd_remove_interval(struct rb_root *root, struct drbd_interval *this)
{
struct rb_node *deepest;
deepest = rb_augment_erase_begin(&this->rb);
rb_erase(&this->rb, root);
rb_augment_erase_end(deepest, update_interval_end, NULL);
}
/**
* drbd_find_overlap - search for an interval overlapping with [sector, sector + size)
* @sector: start sector
* @size: size, aligned to 512 bytes
*
* Returns the interval overlapping with [sector, sector + size), or NULL.
* When there is more than one overlapping interval in the tree, the interval
* with the lowest start sector is returned.
*/
struct drbd_interval *
drbd_find_overlap(struct rb_root *root, sector_t sector, unsigned int size)
{
struct rb_node *node = root->rb_node;
struct drbd_interval *overlap = NULL;
sector_t end = sector + (size >> 9);
BUG_ON(!IS_ALIGNED(size, 512));
while (node) {
struct drbd_interval *here =
rb_entry(node, struct drbd_interval, rb);
if (node->rb_left &&
sector < interval_end(node->rb_left)) {
/* Overlap if any must be on left side */
node = node->rb_left;
} else if (here->sector < end &&
sector < here->sector + (here->size >> 9)) {
overlap = here;
break;
} else if (sector >= here->sector) {
/* Overlap if any must be on right side */
node = node->rb_right;
} else
break;
}
return overlap;
}
