From 2664bd0897c2889258472a1ee922ef9d4c5fa58f Mon Sep 17 00:00:00 2001 From: Vivek Goyal Date: Fri, 11 May 2018 11:49:30 -0400 Subject: ovl: Store lower data inode in ovl_inode Right now ovl_inode stores inode pointer for lower inode. This helps with quickly getting lower inode given overlay inode (ovl_inode_lower()). Now with metadata only copy-up, we can have metacopy inode in middle layer as well and inode containing data can be different from ->lower. I need to be able to open the real file in ovl_open_realfile() and for that I need to quickly find the lower data inode. Hence store lower data inode also in ovl_inode. Also provide an helper ovl_inode_lowerdata() to access this field. Signed-off-by: Vivek Goyal Reviewed-by: Amir Goldstein Signed-off-by: Miklos Szeredi --- fs/overlayfs/namei.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'fs/overlayfs/namei.c') diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c index f562bbb59ddb..85ab856dd134 100644 --- a/fs/overlayfs/namei.c +++ b/fs/overlayfs/namei.c @@ -1080,6 +1080,8 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, .index = index, .numlower = ctr, .redirect = upperredirect, + .lowerdata = (ctr > 1 && !d.is_dir) ? + stack[ctr - 1].dentry : NULL, }; inode = ovl_get_inode(dentry->d_sb, &oip); -- cgit v1.2.3