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zfs/config/kernel-bio-rw-syncio.m4

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Add build system Add autoconf style build infrastructure to the ZFS tree. This includes autogen.sh, configure.ac, m4 macros, some scripts/*, and makefiles for all the core ZFS components.
2010-08-26 18:22:58 +00:00
dnl #
Linux 2.6.36 compat, synchronous bio flag The name of the flag used to mark a bio as synchronous has changed again in the 2.6.36 kernel due to the unification of the BIO_RW_* and REQ_* flags. The new flag is called REQ_SYNC. To simplify checking this flag I have introduced the vdev_disk_dio_is_sync() helper function. Based on the results of several new autoconf tests it uses the correct mask to check for a synchronous bio. Preferred interface for flagging a synchronous bio: 2.6.12-2.6.29: BIO_RW_SYNC 2.6.30-2.6.35: BIO_RW_SYNCIO 2.6.36-2.6.xx: REQ_SYNC
2010-11-10 23:49:40 +00:00
dnl # Preferred interface for flagging a synchronous bio:
dnl # 2.6.12-2.6.29: BIO_RW_SYNC
dnl # 2.6.30-2.6.35: BIO_RW_SYNCIO
dnl # 2.6.36-2.6.xx: REQ_SYNC
Add build system Add autoconf style build infrastructure to the ZFS tree. This includes autogen.sh, configure.ac, m4 macros, some scripts/*, and makefiles for all the core ZFS components.
2010-08-26 18:22:58 +00:00
dnl #
Linux 2.6.36 compat, synchronous bio flag The name of the flag used to mark a bio as synchronous has changed again in the 2.6.36 kernel due to the unification of the BIO_RW_* and REQ_* flags. The new flag is called REQ_SYNC. To simplify checking this flag I have introduced the vdev_disk_dio_is_sync() helper function. Based on the results of several new autoconf tests it uses the correct mask to check for a synchronous bio. Preferred interface for flagging a synchronous bio: 2.6.12-2.6.29: BIO_RW_SYNC 2.6.30-2.6.35: BIO_RW_SYNCIO 2.6.36-2.6.xx: REQ_SYNC
2010-11-10 23:49:40 +00:00
AC_DEFUN([ZFS_AC_KERNEL_BIO_RW_SYNC], [
AC_MSG_CHECKING([whether BIO_RW_SYNC is defined])
ZFS_LINUX_TRY_COMPILE([
#include <linux/bio.h>
],[
int flags;
flags = BIO_RW_SYNC;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_BIO_RW_SYNC, 1, [BIO_RW_SYNC is defined])
],[
AC_MSG_RESULT(no)
])
])
Add build system Add autoconf style build infrastructure to the ZFS tree. This includes autogen.sh, configure.ac, m4 macros, some scripts/*, and makefiles for all the core ZFS components.
2010-08-26 18:22:58 +00:00
AC_DEFUN([ZFS_AC_KERNEL_BIO_RW_SYNCIO], [
AC_MSG_CHECKING([whether BIO_RW_SYNCIO is defined])
ZFS_LINUX_TRY_COMPILE([
#include <linux/bio.h>
],[
int flags;
flags = BIO_RW_SYNCIO;
],[
AC_MSG_RESULT(yes)
Linux 2.6.36 compat, synchronous bio flag The name of the flag used to mark a bio as synchronous has changed again in the 2.6.36 kernel due to the unification of the BIO_RW_* and REQ_* flags. The new flag is called REQ_SYNC. To simplify checking this flag I have introduced the vdev_disk_dio_is_sync() helper function. Based on the results of several new autoconf tests it uses the correct mask to check for a synchronous bio. Preferred interface for flagging a synchronous bio: 2.6.12-2.6.29: BIO_RW_SYNC 2.6.30-2.6.35: BIO_RW_SYNCIO 2.6.36-2.6.xx: REQ_SYNC
2010-11-10 23:49:40 +00:00
AC_DEFINE(HAVE_BIO_RW_SYNCIO, 1, [BIO_RW_SYNCIO is defined])
],[
AC_MSG_RESULT(no)
])
])
AC_DEFUN([ZFS_AC_KERNEL_REQ_SYNC], [
AC_MSG_CHECKING([whether REQ_SYNC is defined])
ZFS_LINUX_TRY_COMPILE([
#include <linux/bio.h>
],[
int flags;
flags = REQ_SYNC;
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_REQ_SYNC, 1, [REQ_SYNC is defined])
Add build system Add autoconf style build infrastructure to the ZFS tree. This includes autogen.sh, configure.ac, m4 macros, some scripts/*, and makefiles for all the core ZFS components.
2010-08-26 18:22:58 +00:00
],[
AC_MSG_RESULT(no)
])
])