# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1285005006 -3600
# Node ID fecdbe814a9fc80a3c18a654c57757380000c269
# Parent 0bc640853cfd71b2fc6a68e95c45df2fd2d3a2f3
rangesets: add function to query for overlaps
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
---
xen/common/rangeset.c | 16 ++++++++++++++++
xen/include/xen/rangeset.h | 2 ++
2 files changed, 18 insertions(+)
diff -r 0bc640853cfd -r fecdbe814a9f xen/common/rangeset.c
--- a/xen/common/rangeset.c Mon Sep 20 18:49:15 2010 +0100
+++ b/xen/common/rangeset.c Mon Sep 20 18:50:06 2010 +0100
@@ -251,6 +251,22 @@ int rangeset_contains_range(
return contains;
}
+int rangeset_overlaps_range(
+ struct rangeset *r, unsigned long s, unsigned long e)
+{
+ struct range *x;
+ int overlaps;
+
+ ASSERT(s <= e);
+
+ spin_lock(&r->lock);
+ x = find_range(r, e);
+ overlaps = (x && (s <= x->e));
+ spin_unlock(&r->lock);
+
+ return overlaps;
+}
+
int rangeset_report_ranges(
struct rangeset *r, unsigned long s, unsigned long e,
int (*cb)(unsigned long s, unsigned long e, void *), void *ctxt)
diff -r 0bc640853cfd -r fecdbe814a9f xen/include/xen/rangeset.h
--- a/xen/include/xen/rangeset.h Mon Sep 20 18:49:15 2010 +0100
+++ b/xen/include/xen/rangeset.h Mon Sep 20 18:50:06 2010 +0100
@@ -53,6 +53,8 @@ int __must_check rangeset_remove_range(
struct rangeset *r, unsigned long s, unsigned long e);
int __must_check rangeset_contains_range(
struct rangeset *r, unsigned long s, unsigned long e);
+int __must_check rangeset_overlaps_range(
+ struct rangeset *r, unsigned long s, unsigned long e);
int rangeset_report_ranges(
struct rangeset *r, unsigned long s, unsigned long e,
int (*cb)(unsigned long s, unsigned long e, void *), void *ctxt);
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