linux-kernel - [PATCH 5/8] fs: introduce struct super_operations::destroy

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Message-Id: <20230531095742.2480623-6-qi.zheng@linux.dev>
Date:   Wed, 31 May 2023 09:57:39 +0000
From:   Qi Zheng <qi.zheng@...ux.dev>
To:     akpm@...ux-foundation.org, tkhai@...ru, roman.gushchin@...ux.dev,
        vbabka@...e.cz, viro@...iv.linux.org.uk, brauner@...nel.org,
        djwong@...nel.org, hughd@...gle.com, paulmck@...nel.org,
        muchun.song@...ux.dev
Cc:     linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        Qi Zheng <zhengqi.arch@...edance.com>
Subject: [PATCH 5/8] fs: introduce struct super_operations::destroy_super() callback

From: Kirill Tkhai <tkhai@...ru>

The patch introduces a new callback, which will be called
asynchronous from delayed work.

This will allows to make ::nr_cached_objects() safe
to be called on destroying superblock in next patches,
and to split unregister_shrinker() into two primitives.

Signed-off-by: Kirill Tkhai <tkhai@...ru>
Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
---
 fs/super.c         | 3 +++
 include/linux/fs.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/fs/super.c b/fs/super.c
index 2ce54561e82e..4e9d08224f86 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -170,6 +170,9 @@ static void destroy_super_work(struct work_struct *work)
 	list_lru_destroy(&s->s_dentry_lru);
 	list_lru_destroy(&s->s_inode_lru);
 
+	if (s->s_op->destroy_super)
+		s->s_op->destroy_super(s);
+
 	for (i = 0; i < SB_FREEZE_LEVELS; i++)
 		percpu_free_rwsem(&s->s_writers.rw_sem[i]);
 	kfree(s);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0b54ac1d331b..30b46d0facfc 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1910,6 +1910,7 @@ struct super_operations {
 	int (*drop_inode) (struct inode *);
 	void (*evict_inode) (struct inode *);
 	void (*put_super) (struct super_block *);
+	void (*destroy_super) (struct super_block *);
 	int (*sync_fs)(struct super_block *sb, int wait);
 	int (*freeze_super) (struct super_block *);
 	int (*freeze_fs) (struct super_block *);
-- 
2.30.2