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drbd: Iterate over all overlapping intervals in a tree

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Add a macro and helper function for doing that.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Andreas Gruenbacher 2011-02-17 18:11:24 +01:00 committed by Philipp Reisner
parent fcefa62e4c
commit d0e22a260c
2 changed files with 30 additions and 4 deletions
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18
drivers/block/drbd/drbd_interval.c
View File

@ -157,3 +157,21 @@ drbd_find_overlap(struct rb_root *root, sector_t sector, unsigned int size)
}
return overlap;
}
struct drbd_interval *
drbd_next_overlap(struct drbd_interval *i, sector_t sector, unsigned int size)
{
sector_t end = sector + (size >> 9);
struct rb_node *node;
for (;;) {
node = rb_next(&i->rb);
if (!node)
return NULL;
i = rb_entry(node, struct drbd_interval, rb);
if (i->sector >= end)
return NULL;
if (sector < i->sector + (i->size >> 9))
return i;
}
}

16
drivers/block/drbd/drbd_interval.h
View File

@ -23,10 +23,18 @@ static inline bool drbd_interval_empty(struct drbd_interval *i)
return RB_EMPTY_NODE(&i->rb);
}
bool drbd_insert_interval(struct rb_root *, struct drbd_interval *);
bool drbd_contains_interval(struct rb_root *, sector_t, struct drbd_interval *);
void drbd_remove_interval(struct rb_root *, struct drbd_interval *);
struct drbd_interval *drbd_find_overlap(struct rb_root *, sector_t,
extern bool drbd_insert_interval(struct rb_root *, struct drbd_interval *);
extern bool drbd_contains_interval(struct rb_root *, sector_t,
struct drbd_interval *);
extern void drbd_remove_interval(struct rb_root *, struct drbd_interval *);
extern struct drbd_interval *drbd_find_overlap(struct rb_root *, sector_t,
unsigned int);
extern struct drbd_interval *drbd_next_overlap(struct drbd_interval *, sector_t,
unsigned int);
#define drbd_for_each_overlap(i, root, sector, size) \
for (i = drbd_find_overlap(root, sector, size); \
i; \
i = drbd_next_overlap(i, sector, size))
#endif /* __DRBD_INTERVAL_H */