mirror_zfs/config/kernel-truncate-setsize.m4

dnl #
dnl # 2.6.35 API change
dnl # Added truncate_setsize() helper function.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_TRUNCATE_SETSIZE], [
	ZFS_CHECK_SYMBOL_EXPORT(
		[truncate_setsize],
		[mm/truncate.c],
		[AC_DEFINE(HAVE_TRUNCATE_SETSIZE, 1,
		[truncate_setsize() is available])],
		[])
])
Tear down and flush the mmap region The inode eviction should unmap the pages associated with the inode. These pages should also be flushed to disk to avoid the data loss. Therefore, use truncate_setsize() in evict_inode() to release the pagecache. The API truncate_setsize() was added in 2.6.35 kernel. To ensure compatibility with the old kernel, the patch defines its own truncate_setsize function. Signed-off-by: Prasad Joshi <pjoshi@stec-inc.com> Closes #255 2011-06-25 16:30:29 +04:00			`dnl #`
			`dnl # 2.6.35 API change`
			`dnl # Added truncate_setsize() helper function.`
			`dnl #`
			`AC_DEFUN([ZFS_AC_KERNEL_TRUNCATE_SETSIZE], [`
			`ZFS_CHECK_SYMBOL_EXPORT(`
			`[truncate_setsize],`
			`[mm/truncate.c],`
			`[AC_DEFINE(HAVE_TRUNCATE_SETSIZE, 1,`
			`[truncate_setsize() is available])],`
			`[])`
			`])`