linux-kernel - [PATCH 02/11] vfs: Remove unnecessary list_for_each_entry

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Message-ID: <20231206060629.2827226-3-david@fromorbit.com>
Date:   Wed,  6 Dec 2023 17:05:31 +1100
From:   Dave Chinner <david@...morbit.com>
To:     linux-fsdevel@...r.kernel.org
Cc:     linux-block@...r.kernel.org, linux-cachefs@...hat.com,
        dhowells@...hat.com, gfs2@...ts.linux.dev,
        dm-devel@...ts.linux.dev, linux-security-module@...r.kernel.org,
        selinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 02/11] vfs: Remove unnecessary list_for_each_entry_safe() variants

From: Jan Kara <jack@...e.cz>

evict_inodes() and invalidate_inodes() use list_for_each_entry_safe()
to iterate sb->s_inodes list. However, since we use i_lru list entry for
our local temporary list of inodes to destroy, the inode is guaranteed
to stay in sb->s_inodes list while we hold sb->s_inode_list_lock. So
there is no real need for safe iteration variant and we can use
list_for_each_entry() just fine.

Signed-off-by: Jan Kara <jack@...e.cz>
Signed-off-by: Waiman Long <longman@...hat.com>
---
 fs/inode.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/inode.c b/fs/inode.c
index f238d987dec9..17c50a75514f 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -712,12 +712,12 @@ static void dispose_list(struct list_head *head)
  */
 void evict_inodes(struct super_block *sb)
 {
-	struct inode *inode, *next;
+	struct inode *inode;
 	LIST_HEAD(dispose);
 
 again:
 	spin_lock(&sb->s_inode_list_lock);
-	list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) {
+	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
 		if (atomic_read(&inode->i_count))
 			continue;
 
@@ -758,12 +758,12 @@ EXPORT_SYMBOL_GPL(evict_inodes);
  */
 void invalidate_inodes(struct super_block *sb)
 {
-	struct inode *inode, *next;
+	struct inode *inode;
 	LIST_HEAD(dispose);
 
 again:
 	spin_lock(&sb->s_inode_list_lock);
-	list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) {
+	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
 		spin_lock(&inode->i_lock);
 		if (inode->i_state & (I_NEW | I_FREEING | I_WILL_FREE)) {
 			spin_unlock(&inode->i_lock);
-- 
2.42.0