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From: Waiman Long <longman@redhat.com>
To: Alexander Viro <viro@zeniv.linux.org.uk>,
	Jan Kara <jack@suse.com>, Jeff Layton <jlayton@poochiereds.net>,
	"J. Bruce Fields" <bfields@fieldses.org>,
	Tejun Heo <tj@kernel.org>,
	Christoph Lameter <cl@linux-foundation.org>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Andi Kleen <andi@firstfloor.org>,
	Dave Chinner <dchinner@redhat.com>,
	Boqun Feng <boqun.feng@gmail.com>,
	Davidlohr Bueso <dave@stgolabs.net>, Jan Kara <jack@suse.cz>,
	Waiman Long <longman@redhat.com>
Subject: [PATCH v9 2/5] vfs: Remove unnecessary list_for_each_entry_safe() variants
Date: Wed, 12 Sep 2018 15:28:49 -0400	[thread overview]
Message-ID: <1536780532-4092-3-git-send-email-longman@redhat.com> (raw)
In-Reply-To: <1536780532-4092-1-git-send-email-longman@redhat.com>

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

diff --git a/fs/inode.c b/fs/inode.c
index 42f6d25..0b5381b 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -606,12 +606,12 @@ 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;
 
@@ -657,11 +657,11 @@ void evict_inodes(struct super_block *sb)
 int invalidate_inodes(struct super_block *sb, bool kill_dirty)
 {
 	int busy = 0;
-	struct inode *inode, *next;
+	struct inode *inode;
 	LIST_HEAD(dispose);
 
 	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);
-- 
1.8.3.1

  parent reply	other threads:[~2018-09-13  0:35 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-12 19:28 [PATCH v9 0/5] vfs: Use dlock list for SB's s_inodes list Waiman Long
2018-09-12 19:28 ` [PATCH v9 1/5] lib/dlock-list: Distributed and lock-protected lists Waiman Long
2018-09-12 19:28 ` Waiman Long [this message]
2018-09-12 19:28 ` [PATCH v9 3/5] vfs: Use dlock list for superblock's inode list Waiman Long
2018-09-17 14:15   ` Davidlohr Bueso
2018-09-17 14:46     ` Waiman Long
2018-09-12 19:28 ` [PATCH v9 4/5] lib/dlock-list: Make sibling CPUs share the same linked list Waiman Long
2018-09-12 19:28 ` [PATCH v9 5/5] lib/dlock-list: Scale dlock_lists_empty() Waiman Long
2018-10-04  7:16   ` Jan Kara
2018-10-04 13:41     ` Waiman Long
2018-10-17  2:51       ` Davidlohr Bueso
2018-09-17 15:18 ` [PATCH v9 6/6] prefetch: Remove spin_lock_prefetch() Waiman Long

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