target/linux/generic/patches-4.1/040-fs-overlay-fix-stacking.patch

   1 From 1c8a47df36d72ace8cf78eb6c228aa0f8027d3c2 Mon Sep 17 00:00:00 2001
   2 From: Miklos Szeredi <miklos@szeredi.hu>
   3 Date: Mon, 12 Oct 2015 15:56:20 +0200
   4 Subject: ovl: fix open in stacked overlay
   5
   6 If two overlayfs filesystems are stacked on top of each other, then we need
   7 recursion in ovl_d_select_inode().
   8
   9 I guess d_backing_inode() is supposed to do that.  But currently it doesn't
  10 and that functionality is open coded in vfs_open().  This is now copied
  11 into ovl_d_select_inode() to fix this regression.
  12
  13 Reported-by: Alban Crequy <alban.crequy@gmail.com>
  14 Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
  15 Fixes: 4bacc9c9234c ("overlayfs: Make f_path always point to the overlay...")
  16 Cc: David Howells <dhowells@redhat.com>
  17 Cc: <stable@vger.kernel.org> # v4.2+
  18 ---
  19  fs/overlayfs/inode.c | 3 +++
  20  1 file changed, 3 insertions(+)
  21
  22 --- a/fs/overlayfs/inode.c
  23 +++ b/fs/overlayfs/inode.c
  24 @@ -383,6 +383,9 @@ struct inode *ovl_d_select_inode(struct
  25                 ovl_path_upper(dentry, &realpath);
  26         }
  27
  28 +       if (realpath.dentry->d_flags & DCACHE_OP_SELECT_INODE)
  29 +               return realpath.dentry->d_op->d_select_inode(realpath.dentry, file_flags);
  30 +
  31         return d_backing_inode(realpath.dentry);
  32  }
  33