config/kernel-xattr-handler.m4

   1 dnl #
   2 dnl # 2.6.35 API change,
   3 dnl # The 'struct xattr_handler' was constified in the generic
   4 dnl # super_block structure.
   5 dnl #
   6 AC_DEFUN([ZFS_AC_KERNEL_CONST_XATTR_HANDLER],
   7         [AC_MSG_CHECKING([whether super_block uses const struct xattr_hander])
   8         ZFS_LINUX_TRY_COMPILE([
   9                 #include <linux/fs.h>
  10                 #include <linux/xattr.h>
  11
  12                 const struct xattr_handler xattr_test_handler = {
  13                         .prefix = "test",
  14                         .get    = NULL,
  15                         .set    = NULL,
  16                 };
  17
  18                 const struct xattr_handler *xattr_handlers[] = {
  19                         &xattr_test_handler,
  20                 };
  21         ],[
  22                 struct super_block sb __attribute__ ((unused));
  23
  24                 sb.s_xattr = xattr_handlers;
  25         ],[
  26                 AC_MSG_RESULT([yes])
  27                 AC_DEFINE(HAVE_CONST_XATTR_HANDLER, 1,
  28                           [super_block uses const struct xattr_hander])
  29         ],[
  30                 AC_MSG_RESULT([no])
  31         ])
  32 ])
  33
  34 dnl #
  35 dnl # 2.6.33 API change,
  36 dnl # The xattr_hander->get() callback was changed to take a dentry
  37 dnl # instead of an inode, and a handler_flags argument was added.
  38 dnl #
  39 AC_DEFUN([ZFS_AC_KERNEL_XATTR_HANDLER_GET], [
  40         AC_MSG_CHECKING([whether xattr_handler->get() wants dentry])
  41         ZFS_LINUX_TRY_COMPILE([
  42                 #include <linux/xattr.h>
  43         ],[
  44                 int (*get)(struct dentry *dentry, const char *name,
  45                     void *buffer, size_t size, int handler_flags) = NULL;
  46                 struct xattr_handler xops __attribute__ ((unused));
  47
  48                 xops.get = get;
  49         ],[
  50                 AC_MSG_RESULT(yes)
  51                 AC_DEFINE(HAVE_DENTRY_XATTR_GET, 1,
  52                     [xattr_handler->get() wants dentry])
  53         ],[
  54                 AC_MSG_RESULT(no)
  55         ])
  56 ])
  57
  58 dnl #
  59 dnl # 2.6.33 API change,
  60 dnl # The xattr_hander->set() callback was changed to take a dentry
  61 dnl # instead of an inode, and a handler_flags argument was added.
  62 dnl #
  63 AC_DEFUN([ZFS_AC_KERNEL_XATTR_HANDLER_SET], [
  64         AC_MSG_CHECKING([whether xattr_handler->set() wants dentry])
  65         ZFS_LINUX_TRY_COMPILE([
  66                 #include <linux/xattr.h>
  67         ],[
  68                 int (*set)(struct dentry *dentry, const char *name,
  69                     const void *buffer, size_t size, int flags,
  70                     int handler_flags) = NULL;
  71                 struct xattr_handler xops __attribute__ ((unused));
  72
  73                 xops.set = set;
  74         ],[
  75                 AC_MSG_RESULT(yes)
  76                 AC_DEFINE(HAVE_DENTRY_XATTR_SET, 1,
  77                     [xattr_handler->set() wants dentry])
  78         ],[
  79                 AC_MSG_RESULT(no)
  80         ])
  81 ])