From 1c8a47df36d72ace8cf78eb6c228aa0f8027d3c2 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Mon, 12 Oct 2015 15:56:20 +0200 Subject: ovl: fix open in stacked overlay If two overlayfs filesystems are stacked on top of each other, then we need recursion in ovl_d_select_inode(). I guess d_backing_inode() is supposed to do that. But currently it doesn't and that functionality is open coded in vfs_open(). This is now copied into ovl_d_select_inode() to fix this regression. Reported-by: Alban Crequy Signed-off-by: Miklos Szeredi Fixes: 4bacc9c9234c ("overlayfs: Make f_path always point to the overlay...") Cc: David Howells Cc: # v4.2+ --- fs/overlayfs/inode.c | 3 +++ 1 file changed, 3 insertions(+) --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -383,6 +383,9 @@ struct inode *ovl_d_select_inode(struct ovl_path_upper(dentry, &realpath); } + if (realpath.dentry->d_flags & DCACHE_OP_SELECT_INODE) + return realpath.dentry->d_op->d_select_inode(realpath.dentry, file_flags); + return d_backing_inode(realpath.dentry); }