From:   Chengguang Xu <cgxu519@mykernel.net>
To:     miklos@szeredi.hu, jack@suse.cz, amir73il@gmail.com
Cc:     linux-unionfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Chengguang Xu <charliecgxu@tencent.com>
Message-ID: <20211122030038.1938875-6-cgxu519@mykernel.net>
Subject: [RFC PATCH V6 5/7] fs: export wait_sb_inodes()
Date:   Mon, 22 Nov 2021 11:00:36 +0800
In-Reply-To: <20211122030038.1938875-1-cgxu519@mykernel.net>
References: <20211122030038.1938875-1-cgxu519@mykernel.net>
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From: Chengguang Xu <charliecgxu@tencent.com>

In order to wait syncing upper inodes we need to
call wait_sb_inodes() in overlayfs' ->sync_fs.

Signed-off-by: Chengguang Xu <charliecgxu@tencent.com>
---
 fs/fs-writeback.c         | 3 ++-
 include/linux/writeback.h | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 81ec192ce067..0438c911241e 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -2505,7 +2505,7 @@ EXPORT_SYMBOL(__mark_inode_dirty);
  * completed by the time we have gained the lock and waited for all IO tha=
t is
  * in progress regardless of the order callers are granted the lock.
  */
-static void wait_sb_inodes(struct super_block *sb)
+void wait_sb_inodes(struct super_block *sb)
 {
 =09LIST_HEAD(sync_list);
=20
@@ -2589,6 +2589,7 @@ static void wait_sb_inodes(struct super_block *sb)
 =09rcu_read_unlock();
 =09mutex_unlock(&sb->s_sync_lock);
 }
+EXPORT_SYMBOL(wait_sb_inodes);
=20
 static void __writeback_inodes_sb_nr(struct super_block *sb, unsigned long=
 nr,
 =09=09=09=09     enum wb_reason reason, bool skip_if_busy)
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index d1f65adf6a26..d7aacd0434cf 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -198,6 +198,7 @@ void wakeup_flusher_threads_bdi(struct backing_dev_info=
 *bdi,
 =09=09=09=09enum wb_reason reason);
 void inode_wait_for_writeback(struct inode *inode);
 void inode_io_list_del(struct inode *inode);
+void wait_sb_inodes(struct super_block *sb);
=20
 /* writeback.h requires fs.h; it, too, is not included from here. */
 static inline void wait_on_inode(struct inode *inode)
--=20
2.27.0