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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>
],[
Fix gcc configure warnings Newer versions of gcc are getting smart enough to detect the sloppy syntax used for the autoconf tests. It is now generating warnings for unused/undeclared variables. Newer version of gcc even have the -Wunused-but-set-variable option set by default. This isn't a problem except when -Werror is set and they get promoted to an error. In this case the autoconf test will return an incorrect result which will result in a build failure latter on. To handle this I'm tightening up many of the autoconf tests to explicitly mark variables as unused to suppress the gcc warning. Remember, all of the autoconf code can never actually be run we just want to get a clean build error to detect which APIs are available. Never using a variable is absolutely fine for this. Closes #176
2011-04-19 17:02:21 +00:00
int flags __attribute__ ((unused));
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
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>
],[
Fix gcc configure warnings Newer versions of gcc are getting smart enough to detect the sloppy syntax used for the autoconf tests. It is now generating warnings for unused/undeclared variables. Newer version of gcc even have the -Wunused-but-set-variable option set by default. This isn't a problem except when -Werror is set and they get promoted to an error. In this case the autoconf test will return an incorrect result which will result in a build failure latter on. To handle this I'm tightening up many of the autoconf tests to explicitly mark variables as unused to suppress the gcc warning. Remember, all of the autoconf code can never actually be run we just want to get a clean build error to detect which APIs are available. Never using a variable is absolutely fine for this. Closes #176
2011-04-19 17:02:21 +00:00
int flags __attribute__ ((unused));
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
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>
],[
Fix gcc configure warnings Newer versions of gcc are getting smart enough to detect the sloppy syntax used for the autoconf tests. It is now generating warnings for unused/undeclared variables. Newer version of gcc even have the -Wunused-but-set-variable option set by default. This isn't a problem except when -Werror is set and they get promoted to an error. In this case the autoconf test will return an incorrect result which will result in a build failure latter on. To handle this I'm tightening up many of the autoconf tests to explicitly mark variables as unused to suppress the gcc warning. Remember, all of the autoconf code can never actually be run we just want to get a clean build error to detect which APIs are available. Never using a variable is absolutely fine for this. Closes #176
2011-04-19 17:02:21 +00:00
int flags __attribute__ ((unused));
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
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)
])
])