linux-kernel - [PATCH v2 01/10] maple_tree: Rework mtree_alloc

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Message-Id: <20230517085809.86522-2-zhangpeng.00@bytedance.com>
Date:   Wed, 17 May 2023 16:58:00 +0800
From:   Peng Zhang <zhangpeng.00@...edance.com>
To:     Liam.Howlett@...cle.com
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, maple-tree@...ts.infradead.org,
        Peng Zhang <zhangpeng.00@...edance.com>
Subject: [PATCH v2 01/10] maple_tree: Rework mtree_alloc_{range,rrange}()

Use mas_empty_area{_rev}() to refactor mtree_alloc_{range,rrange}()

Signed-off-by: Peng Zhang <zhangpeng.00@...edance.com>
---
 lib/maple_tree.c | 63 ++++++++++++++++++++++++------------------------
 1 file changed, 32 insertions(+), 31 deletions(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 4eb220008f72..e1820e90f167 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -6493,32 +6493,31 @@ 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);
-	if (mas_nomem(&mas, gfp))
-		goto retry;
-
+	ret = mas_empty_area(&mas, min, max, size);
+	if (!ret) {
+		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;
+	}
 	mtree_unlock(mt);
+	if (!ret) {
+		if (mas_is_err(&mas))
+			return xa_err(mas.node);
+		*startp = mas.index;
+	}
 	return ret;
 }
 EXPORT_SYMBOL(mtree_alloc_range);
@@ -6529,29 +6528,31 @@ 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);
-	if (mas_nomem(&mas, gfp))
-		goto retry;
-
+	ret = mas_empty_area_rev(&mas, min, max, size);
+	if (!ret) {
+		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;
+	}
 	mtree_unlock(mt);
+	if (!ret) {
+		if (mas_is_err(&mas))
+			return xa_err(mas.node);
+		*startp = mas.index;
+	}
 	return ret;
 }
 EXPORT_SYMBOL(mtree_alloc_rrange);
-- 
2.20.1