mirror_zfs/config/kernel-fsync.m4

dnl #
dnl # 2.6.35 API change
dnl # The dentry argument was deamed unused and dropped in 2.6.36.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_FSYNC_2ARGS], [
	AC_MSG_CHECKING([whether fops->fsync() wants 2 args])
	ZFS_LINUX_TRY_COMPILE([
		#include <linux/fs.h>
	],[
		int (*fsync) (struct file *, int datasync) = NULL;
		struct file_operations fops __attribute__ ((unused));

		fops.fsync = fsync;
	],[
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_2ARGS_FSYNC, 1, [fops->fsync() want 2 args])
	],[
		AC_MSG_RESULT(no)
	])
])
Linux 2.6.35 compat, fops->fsync() The fsync() callback in the file_operations structure used to take 3 arguments. The callback now only takes 2 arguments because the dentry argument was determined to be unused by all consumers. To handle this a compatibility prototype was added to ensure the right prototype is used. Our implementation never used the dentry argument either so it's just a matter of using the right prototype. 2011-02-11 19:58:55 +03:00			`dnl #`
			`dnl # 2.6.35 API change`
			`dnl # The dentry argument was deamed unused and dropped in 2.6.36.`
			`dnl #`
			`AC_DEFUN([ZFS_AC_KERNEL_FSYNC_2ARGS], [`
			`AC_MSG_CHECKING([whether fops->fsync() wants 2 args])`
			`ZFS_LINUX_TRY_COMPILE([`
			`#include <linux/fs.h>`
			`],[`
			`int (fsync) (struct file , int datasync) = NULL;`
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 21:02:21 +04:00			`struct file_operations fops __attribute__ ((unused));`
Linux 2.6.35 compat, fops->fsync() The fsync() callback in the file_operations structure used to take 3 arguments. The callback now only takes 2 arguments because the dentry argument was determined to be unused by all consumers. To handle this a compatibility prototype was added to ensure the right prototype is used. Our implementation never used the dentry argument either so it's just a matter of using the right prototype. 2011-02-11 19:58:55 +03:00
			`fops.fsync = fsync;`
			`],[`
			`AC_MSG_RESULT(yes)`
			`AC_DEFINE(HAVE_2ARGS_FSYNC, 1, [fops->fsync() want 2 args])`
			`],[`
			`AC_MSG_RESULT(no)`
			`])`
			`])`