Use mas_empty_area{_rev}() to refactor mtree_alloc_{range,rrange}()
Signed-off-by: Peng Zhang <[email protected]>
Reviewed-by: Liam R. Howlett <[email protected]>
---
lib/maple_tree.c | 57 +++++++++++++++++++++++++++---------------------
1 file changed, 32 insertions(+), 25 deletions(-)
diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 4eb220008f72..96d102d60b4e 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -6493,31 +6493,33 @@ int mtree_alloc_range(struct maple_tree *mt, unsigned long *startp,
{
int ret = 0;
- MA_STATE(mas, mt, min, min);
+ MA_STATE(mas, mt, 0, 0);
if (!mt_is_alloc(mt))
return -EINVAL;
if (WARN_ON_ONCE(mt_is_reserved(entry)))
return -EINVAL;
- if (min > max)
- return -EINVAL;
-
- if (max < size)
- return -EINVAL;
-
- if (!size)
- return -EINVAL;
-
mtree_lock(mt);
retry:
- mas.offset = 0;
- mas.index = min;
- mas.last = max - size + 1;
- ret = mas_alloc(&mas, entry, size, startp);
+ ret = mas_empty_area(&mas, min, max, size);
+ if (ret)
+ goto unlock;
+
+ mas_insert(&mas, entry);
+ /*
+ * mas_nomem() may release the lock, causing the allocated area
+ * to be unavailable, so try to allocate a free area again.
+ */
if (mas_nomem(&mas, gfp))
goto retry;
+ if (mas_is_err(&mas))
+ ret = xa_err(mas.node);
+ else
+ *startp = mas.index;
+
+unlock:
mtree_unlock(mt);
return ret;
}
@@ -6529,28 +6531,33 @@ int mtree_alloc_rrange(struct maple_tree *mt, unsigned long *startp,
{
int ret = 0;
- MA_STATE(mas, mt, min, max - size + 1);
+ MA_STATE(mas, mt, 0, 0);
if (!mt_is_alloc(mt))
return -EINVAL;
if (WARN_ON_ONCE(mt_is_reserved(entry)))
return -EINVAL;
- if (min > max)
- return -EINVAL;
-
- if (max < size - 1)
- return -EINVAL;
-
- if (!size)
- return -EINVAL;
-
mtree_lock(mt);
retry:
- ret = mas_rev_alloc(&mas, min, max, entry, size, startp);
+ ret = mas_empty_area_rev(&mas, min, max, size);
+ if (ret)
+ goto unlock;
+
+ mas_insert(&mas, entry);
+ /*
+ * mas_nomem() may release the lock, causing the allocated area
+ * to be unavailable, so try to allocate a free area again.
+ */
if (mas_nomem(&mas, gfp))
goto retry;
+ if (mas_is_err(&mas))
+ ret = xa_err(mas.node);
+ else
+ *startp = mas.index;
+
+unlock:
mtree_unlock(mt);
return ret;
}
--
2.20.1