linux-kernel - [PATCH RFC 07/10] fs: Introduce struct super_operations::destroy

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Date:   Tue, 07 Aug 2018 18:38:48 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     akpm@...ux-foundation.org, gregkh@...uxfoundation.org,
        rafael@...nel.org, viro@...iv.linux.org.uk,
        darrick.wong@...cle.com, paulmck@...ux.vnet.ibm.com,
        josh@...htriplett.org, rostedt@...dmis.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com,
        hughd@...gle.com, shuah@...nel.org, robh@...nel.org,
        ulf.hansson@...aro.org, aspriel@...il.com,
        vivek.gautam@...eaurora.org, robin.murphy@....com, joe@...ches.com,
        heikki.krogerus@...ux.intel.com, ktkhai@...tuozzo.com,
        sfr@...b.auug.org.au, vdavydov.dev@...il.com, mhocko@...e.com,
        chris@...is-wilson.co.uk, penguin-kernel@...ove.SAKURA.ne.jp,
        aryabinin@...tuozzo.com, willy@...radead.org, ying.huang@...el.com,
        shakeelb@...gle.com, jbacik@...com, mingo@...nel.org,
        mhiramat@...nel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH RFC 07/10] fs: Introduce struct
 super_operations::destroy_super() callback.

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 <ktkhai@...tuozzo.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 9222cfc196bf..c60f092538c7 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 842fde0f0981..33dfaed0a01a 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1880,6 +1880,7 @@ 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 *);