From: Chengguang Xu <charliecgxu@xxxxxxxxxxx>
Sync dirty data and meta of upper inode in overlayfs' ->write_inode()
and redirty overlayfs' inode.
Signed-off-by: Chengguang Xu <charliecgxu@xxxxxxxxxxx>
---
fs/overlayfs/super.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 18a12088a37b..12acf0ec7395 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -15,6 +15,7 @@
#include <linux/seq_file.h>
#include <linux/posix_acl_xattr.h>
#include <linux/exportfs.h>
+#include <linux/writeback.h>
#include "overlayfs.h"
MODULE_AUTHOR("Miklos Szeredi <miklos@xxxxxxxxxx>");
@@ -406,12 +407,32 @@ static int ovl_remount(struct super_block *sb, int *flags, char *data)
return ret;
}
+static int ovl_write_inode(struct inode *inode,
+ struct writeback_control *wbc)
+{
+ struct ovl_fs *ofs = inode->i_sb->s_fs_info;
+ struct inode *upper_inode = ovl_inode_upper(inode);
+ int ret = 0;
+
+ if (!upper_inode)
+ return 0;
+
+ if (!ovl_should_sync(ofs))
+ return 0;
+
+ ret = write_inode_now(upper_inode, wbc->sync_mode == WB_SYNC_ALL);
+ mark_inode_dirty(inode);
+
+ return ret;
+}
+
static const struct super_operations ovl_super_operations = {
.alloc_inode = ovl_alloc_inode,
.free_inode = ovl_free_inode,
.destroy_inode = ovl_destroy_inode,
.drop_inode = generic_delete_inode,
.put_super = ovl_put_super,
+ .write_inode = ovl_write_inode,
.sync_fs = ovl_sync_fs,
.statfs = ovl_statfs,
.show_options = ovl_show_options,
--
2.27.0
