linux-kernel - [PATCH 01/18] maple_tree: introduce store

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Date: Tue,  4 Jun 2024 10:41:28 -0700
From: Sidhartha Kumar <sidhartha.kumar@...cle.com>
To: linux-kernel@...r.kernel.org, maple-tree@...ts.infradead.org
Cc: linux-mm@...ck.org, akpm@...ux-foundation.org, liam.howlett@...cle.com,
        zhangpeng.00@...edance.com, willy@...radead.org,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>
Subject: [PATCH 01/18] maple_tree: introduce store_type enum

Add a store_type enum that is stored in ma_state. This will be used to
keep track of partial walks of the tree so that subsequent walks can
pick up where a previous walk left off.

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
---
 include/linux/maple_tree.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h
index a53ad4dabd7e..2a2abda9eb32 100644
--- a/include/linux/maple_tree.h
+++ b/include/linux/maple_tree.h
@@ -148,6 +148,19 @@ enum maple_type {
 	maple_arange_64,
 };
 
+enum store_type {
+	wr_invalid,
+	wr_new_root,
+	wr_store_root,
+	wr_exact_fit,
+	wr_spanning_store,
+	wr_split_store,
+	wr_rebalance,
+	wr_append,
+	wr_node_store,
+	wr_slot_store,
+	wr_bnode
+};
 
 /**
  * DOC: Maple tree flags
@@ -436,6 +449,7 @@ struct ma_state {
 	unsigned char offset;
 	unsigned char mas_flags;
 	unsigned char end;		/* The end of the node */
+	enum store_type store_type;	/* The type of store needed for this operation */
 };
 
 struct ma_wr_state {
@@ -477,6 +491,7 @@ struct ma_wr_state {
 		.max = ULONG_MAX,					\
 		.alloc = NULL,						\
 		.mas_flags = 0,						\
+		.store_type = wr_invalid,				\
 	}
 
 #define MA_WR_STATE(name, ma_state, wr_entry)				\
-- 
2.45.1