Implement overlayfs' ->write_inode to sync dirty data
and redirty overlayfs' inode if necessary.
Signed-off-by: Chengguang Xu <cgxu519@xxxxxxxxxxxx>
---
fs/overlayfs/super.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 5d7e12b8bd1f..960e79e7a8b5 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>");
@@ -396,11 +397,36 @@ static void ovl_evict_inode (struct inode *inode)
clear_inode(inode);
}
+static int ovl_write_inode(struct inode *inode,
+ struct writeback_control *wbc)
+{
+ struct inode *upper = ovl_inode_upper(inode);
+ unsigned long iflag = 0;
+ int ret = 0;
+
+ if (!upper)
+ return 0;
+
+ if (upper->i_sb->s_op->write_inode)
+ ret = upper->i_sb->s_op->write_inode(inode, wbc);
+
+ iflag |= upper->i_state & I_DIRTY_ALL;
+ if (mapping_writably_mapped(upper->i_mapping) ||
+ mapping_tagged(upper->i_mapping, PAGECACHE_TAG_WRITEBACK))
+ iflag |= I_DIRTY_PAGES;
+
+ if (iflag)
+ ovl_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,
+ .write_inode = ovl_write_inode,
.evict_inode = ovl_evict_inode,
.put_super = ovl_put_super,
.sync_fs = ovl_sync_fs,
--
2.26.2
