From: Chengguang Xu <charliecgxu@xxxxxxxxxxx>
In order to wait syncing upper inodes we need to
call wait_sb_inodes() in overlayfs' ->sync_fs.
Signed-off-by: Chengguang Xu <charliecgxu@xxxxxxxxxxx>
---
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 that 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)
{
LIST_HEAD(sync_list);
@@ -2589,6 +2589,7 @@ static void wait_sb_inodes(struct super_block *sb)
rcu_read_unlock();
mutex_unlock(&sb->s_sync_lock);
}
+EXPORT_SYMBOL(wait_sb_inodes);
static void __writeback_inodes_sb_nr(struct super_block *sb, unsigned long nr,
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,
enum 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);
/* writeback.h requires fs.h; it, too, is not included from here. */
static inline void wait_on_inode(struct inode *inode)
--
2.27.0
