target/linux/generic/patches-2.6.37/210-overlayfs_2.6.37_backport.patch

   1 --- a/fs/overlayfs/overlayfs.c
   2 +++ b/fs/overlayfs/overlayfs.c
   3 @@ -28,13 +28,8 @@ struct ovl_fs {
   4  struct ovl_entry {
   5         struct dentry *__upperdentry;
   6         struct dentry *lowerdentry;
   7 -       union {
   8 -               struct {
   9 -                       u64 version;
  10 -                       bool opaque;
  11 -               };
  12 -               struct rcu_head rcu;
  13 -       };
  14 +       u64 version;
  15 +       bool opaque;
  16  };
  17
  18  static const char *ovl_whiteout_xattr = "trusted.overlay.whiteout";
  19 @@ -632,12 +627,6 @@ static const struct file_operations ovl_
  20
  21  static const struct inode_operations ovl_dir_inode_operations;
  22
  23 -static void ovl_entry_free(struct rcu_head *head)
  24 -{
  25 -       struct ovl_entry *oe = container_of(head, struct ovl_entry, rcu);
  26 -       kfree(oe);
  27 -}
  28 -
  29  static void ovl_dentry_release(struct dentry *dentry)
  30  {
  31         struct ovl_entry *oe = dentry->d_fsdata;
  32 @@ -645,7 +634,7 @@ static void ovl_dentry_release(struct de
  33         if (oe) {
  34                 dput(oe->__upperdentry);
  35                 dput(oe->lowerdentry);
  36 -               call_rcu(&oe->rcu, ovl_entry_free);
  37 +               kfree(oe);
  38         }
  39  }
  40
  41 @@ -1338,7 +1327,7 @@ static int ovl_dir_getattr(struct vfsmou
  42         return 0;
  43  }
  44
  45 -static int ovl_permission(struct inode *inode, int mask, unsigned int flags)
  46 +static int ovl_permission(struct inode *inode, int mask)
  47  {
  48         struct ovl_entry *oe;
  49         struct dentry *alias = NULL;
  50 @@ -1349,8 +1338,6 @@ static int ovl_permission(struct inode *
  51
  52         if (S_ISDIR(inode->i_mode)) {
  53                 oe = inode->i_private;
  54 -       } else if (flags & IPERM_FLAG_RCU) {
  55 -               return -ECHILD;
  56         } else {
  57                 /*
  58                  * For non-directories find an alias and get the info
  59 @@ -1377,7 +1364,6 @@ static int ovl_permission(struct inode *
  60         /* Careful in RCU walk mode */
  61         realinode = ACCESS_ONCE(realdentry->d_inode);
  62         if (!realinode) {
  63 -               WARN_ON(!(flags & IPERM_FLAG_RCU));
  64                 return -ENOENT;
  65         }
  66
  67 @@ -1402,9 +1388,9 @@ static int ovl_permission(struct inode *
  68         }
  69
  70         if (realinode->i_op->permission)
  71 -               err = realinode->i_op->permission(realinode, mask, flags);
  72 +               err = realinode->i_op->permission(realinode, mask);
  73         else
  74 -               err = generic_permission(realinode, mask, flags,
  75 +               err = generic_permission(realinode, mask,
  76                                          realinode->i_op->check_acl);
  77  out_dput:
  78         dput(alias);