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Linux 3.1 compat, kern_path_parent()

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Prior to Linux 3.1 the kern_path_parent symbol was exported for
use by kernel modules.  As of Linux 3.1 it is now longer easily
available.  To handle this case the spl will now dynamically
look up address of the missing symbol at module load time.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #52
This commit is contained in:
Brian Behlendorf
2011-11-09 12:29:51 -08:00
parent b8b6e4c453
commit 12ff95ff57
7 changed files with 152 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files
config/spl-build.m4
+44 -3
View File
@@ -80,7 +80,8 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
SPL_AC_KERNEL_2ARGS_INVALIDATE_INODES
SPL_AC_SHRINK_DCACHE_MEMORY
SPL_AC_SHRINK_ICACHE_MEMORY
SPL_AC_KERN_PATH_PARENT
SPL_AC_KERN_PATH_PARENT_HEADER
SPL_AC_KERN_PATH_PARENT_SYMBOL
SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
SPL_AC_SHRINK_CONTROL_STRUCT
])
@@ -587,6 +588,30 @@ AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT],
fi
])
dnl #
dnl # SPL_CHECK_SYMBOL_HEADER
dnl # check if a symbol prototype is defined in listed headers.
dnl #
AC_DEFUN([SPL_CHECK_SYMBOL_HEADER], [
AC_MSG_CHECKING([whether symbol $1 exists in header])
header=0
for file in $3; do
grep -q "$2" "$LINUX/$file" 2>/dev/null
rc=$?
if test $rc -eq 0; then
header=1
break;
fi
done
if test $header -eq 0; then
AC_MSG_RESULT([no])
$5
else
AC_MSG_RESULT([yes])
$4
fi
])
dnl #
dnl # SPL_CHECK_HEADER
dnl # check whether header exists and define HAVE_$2_HEADER
@@ -1809,11 +1834,27 @@ dnl # and the flags argument has been removed. The only behavior now
dnl # offered is that of LOOKUP_PARENT. The spl already always passed
dnl # this flag so dropping the flag does not impact us.
dnl #
AC_DEFUN([SPL_AC_KERN_PATH_PARENT], [
AC_DEFUN([SPL_AC_KERN_PATH_PARENT_HEADER], [
SPL_CHECK_SYMBOL_HEADER(
[kern_path_parent],
[int kern_path_parent(const char \*, struct nameidata \*)],
[include/linux/namei.h],
[AC_DEFINE(HAVE_KERN_PATH_PARENT_HEADER, 1,
[kern_path_parent() is available])],
[])
])
dnl #
dnl # 3.1 API compat,
dnl # The kern_path_parent() symbol is no longer exported by the kernel.
dnl # However, it remains the prefered interface and since we still have
dnl # access to the prototype we dynamically lookup the required address.
dnl #
AC_DEFUN([SPL_AC_KERN_PATH_PARENT_SYMBOL], [
SPL_CHECK_SYMBOL_EXPORT(
[kern_path_parent],
[fs/namei.c],
[AC_DEFINE(HAVE_KERN_PATH_PARENT, 1,
[AC_DEFINE(HAVE_KERN_PATH_PARENT_SYMBOL, 1,
[kern_path_parent() is available])],
[])
])