freebsd-nq/config/kernel-current-time.m4
Brian Behlendorf 6413c95fbd
Linux 4.18 compat: inode timespec -> timespec64
Commit torvalds/linux@95582b0 changes the inode i_atime, i_mtime,
and i_ctime members form timespec's to timespec64's to make them
2038 safe.  As part of this change the current_time() function was
also updated to return the timespec64 type.

Resolve this issue by introducing a new inode_timespec_t type which
is defined to match the timespec type used by the inode.  It should
be used when working with inode timestamps to ensure matching types.

The timestruc_t type under Illumos was used in a similar fashion but
was specified to always be a timespec_t.  Rather than incorrectly
define this type all timespec_t types have been replaced by the new
inode_timespec_t type.

Finally, the kernel and user space 'sys/time.h' headers were aligned
with each other.  They define as appropriate for the context several
constants as macros and include static inline implementation of
gethrestime(), gethrestime_sec(), and gethrtime().

Reviewed-by: Chunwei Chen <tuxoko@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #7643
2018-06-19 21:51:18 -07:00

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dnl #
dnl # 4.9, current_time() added
dnl # 4.18, return type changed from timespec to timespec64
dnl #
AC_DEFUN([ZFS_AC_KERNEL_CURRENT_TIME],
[AC_MSG_CHECKING([whether current_time() exists])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/fs.h>
], [
struct inode ip __attribute__ ((unused));
ip.i_atime = current_time(&ip);
], [current_time], [fs/inode.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_CURRENT_TIME, 1, [current_time() exists])
], [
AC_MSG_RESULT(no)
])
])