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Linux 4.5 compat: Use xattr_handler->name for acl

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Linux 4.5 added member "name" to xattr_handler. xattr_handler which matches to
whole name rather than prefix should use "name" instead of "prefix".
Otherwise, kernel will return with EINVAL when it tries to resolve handlers.

Also, we remove the strcmp checks when xattr_handler has name, because
xattr_resolve_name will do the check for us.

Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4549
Closes #4537
This commit is contained in:
Chunwei Chen
2016-04-21 17:19:07 -07:00
committed by Brian Behlendorf
parent da5e151f20
commit 232604b58e
3 changed files with 70 additions and 20 deletions
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config/kernel-xattr-handler.m4
+25
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@@ -32,6 +32,31 @@ AC_DEFUN([ZFS_AC_KERNEL_CONST_XATTR_HANDLER], [
])
])
dnl #
dnl # 4.5 API change,
dnl # struct xattr_handler added new member "name".
dnl # xattr_handler which matches to whole name rather than prefix should use
dnl # "name" instead of "prefix", e.g. "system.posix_acl_access"
dnl #
AC_DEFUN([ZFS_AC_KERNEL_XATTR_HANDLER_NAME], [
AC_MSG_CHECKING([whether xattr_handler has name])
ZFS_LINUX_TRY_COMPILE([
#include <linux/xattr.h>
static const struct xattr_handler
xops __attribute__ ((unused)) = {
.name = XATTR_NAME_POSIX_ACL_ACCESS,
};
],[
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_XATTR_HANDLER_NAME, 1,
[xattr_handler has name])
],[
AC_MSG_RESULT(no)
])
])
dnl #
dnl # Supported xattr handler get() interfaces checked newest to oldest.
dnl #