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zfs/config/kernel-filemap.m4

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Linux: use filemap_range_has_page() As of the 4.13 kernel filemap_range_has_page() can be used to check if there is a page mapped in a given file range. When available this interface should be used which eliminates the need for the zp->z_is_mapped boolean. Reviewed-by: Brian Atkinson <batkinson@lanl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #14493
2023-02-14 19:04:34 +00:00
dnl #
dnl # filemap_range_has_page was not available till 4.13
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_FILEMAP], [
ZFS_LINUX_TEST_SRC([filemap_range_has_page], [
#include <linux/fs.h>
Linux 5.18+ compat: Detect filemap_range_has_page In v5.18 `filemap_range_has_page` moved to `pagemap.h` `pagemap.h` has been around since 3.10 so just include both Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Rob Norris <robn@despairlabs.com> Signed-off-by: Robert Evans <evansr@google.com> Closes #16034
2024-03-30 00:11:52 +00:00
#include <linux/pagemap.h>
Linux: use filemap_range_has_page() As of the 4.13 kernel filemap_range_has_page() can be used to check if there is a page mapped in a given file range. When available this interface should be used which eliminates the need for the zp->z_is_mapped boolean. Reviewed-by: Brian Atkinson <batkinson@lanl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #14493
2023-02-14 19:04:34 +00:00
],[
struct address_space *mapping = NULL;
loff_t lstart = 0;
loff_t lend = 0;
bool ret __attribute__ ((unused));
ret = filemap_range_has_page(mapping, lstart, lend);
])
])
AC_DEFUN([ZFS_AC_KERNEL_FILEMAP], [
AC_MSG_CHECKING([whether filemap_range_has_page() is available])
ZFS_LINUX_TEST_RESULT([filemap_range_has_page], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FILEMAP_RANGE_HAS_PAGE, 1,
[filemap_range_has_page() is available])
],[
AC_MSG_RESULT(no)
])
])