Commit 1c8a47df authored Oct 12, 2015 by Miklos Szeredi

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 <alban.crequy@gmail.com>
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Fixes: 4bacc9c9 ("overlayfs: Make f_path always point to the overlay...")
Cc: David Howells <dhowells@redhat.com>
Cc: <stable@vger.kernel.org> # v4.2+

parent ab79efab

fs/overlayfs/inode.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -363,6 +363,9 @@ struct inode ovl_d_select_inode(struct dentry dentry, unsigned file_flags)
		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);
		}