linux-kernel - [PATCH 3/3 v2] btrfs: use list_for_each

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Message-Id: <d65aa20f49405e738c90aaf703ccec31f311de22.1450712597.git.geliangtang@163.com>
Date:	Mon, 21 Dec 2015 23:50:23 +0800
From:	Geliang Tang <geliangtang@....com>
To:	Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
	David Sterba <dsterba@...e.com>
Cc:	Geliang Tang <geliangtang@....com>, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/3 v2] btrfs: use list_for_each_entry* in backref.c

Use list_for_each_entry*() to simplify the code.

Signed-off-by: Geliang Tang <geliangtang@....com>
---
Changes in v2:
 - Use list_for_each_entry_safe_continue() in __merge_refs().
---
 fs/btrfs/backref.c | 23 ++++++-----------------
 1 file changed, 6 insertions(+), 17 deletions(-)

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index d453d62..08405a3 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -520,13 +520,10 @@ static inline int ref_for_same_block(struct __prelim_ref *ref1,
 static int __add_missing_keys(struct btrfs_fs_info *fs_info,
 			      struct list_head *head)
 {
-	struct list_head *pos;
+	struct __prelim_ref *ref;
 	struct extent_buffer *eb;
 
-	list_for_each(pos, head) {
-		struct __prelim_ref *ref;
-		ref = list_entry(pos, struct __prelim_ref, list);
-
+	list_for_each_entry(ref, head, list) {
 		if (ref->parent)
 			continue;
 		if (ref->key_for_search.type)
@@ -563,23 +560,15 @@ static int __add_missing_keys(struct btrfs_fs_info *fs_info,
  */
 static void __merge_refs(struct list_head *head, int mode)
 {
-	struct list_head *pos1;
+	struct __prelim_ref *ref1;
 
-	list_for_each(pos1, head) {
-		struct list_head *n2;
-		struct list_head *pos2;
-		struct __prelim_ref *ref1;
+	list_for_each_entry(ref1, head, list) {
+		struct __prelim_ref *ref2 = ref1, *tmp;
 
-		ref1 = list_entry(pos1, struct __prelim_ref, list);
-
-		for (pos2 = pos1->next, n2 = pos2->next; pos2 != head;
-		     pos2 = n2, n2 = pos2->next) {
-			struct __prelim_ref *ref2;
+		list_for_each_entry_safe_continue(ref2, tmp, head, list) {
 			struct __prelim_ref *xchg;
 			struct extent_inode_elem *eie;
 
-			ref2 = list_entry(pos2, struct __prelim_ref, list);
-
 			if (!ref_for_same_block(ref1, ref2))
 				continue;
 			if (mode == 1) {
-- 
2.5.0


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