The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/config/kernel-vfs-read_folio.m4

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    1 dnl #
    2 dnl # Linux 5.19 uses read_folio in lieu of readpage
    3 dnl #
    4 AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_READ_FOLIO], [
    5         ZFS_LINUX_TEST_SRC([vfs_has_read_folio], [
    6                 #include <linux/fs.h>
    7 
    8                 static int
    9                 test_read_folio(struct file *file, struct folio *folio) {
   10                         (void) file; (void) folio;
   11                         return (0);
   12                 }
   13 
   14                 static const struct address_space_operations
   15                     aops __attribute__ ((unused)) = {
   16                         .read_folio     = test_read_folio,
   17                 };
   18         ],[])
   19 ])
   20 
   21 AC_DEFUN([ZFS_AC_KERNEL_VFS_READ_FOLIO], [
   22         dnl #
   23         dnl # Linux 5.19 uses read_folio in lieu of readpage
   24         dnl #
   25         AC_MSG_CHECKING([whether read_folio exists])
   26         ZFS_LINUX_TEST_RESULT([vfs_has_read_folio], [
   27                 AC_MSG_RESULT([yes])
   28                 AC_DEFINE(HAVE_VFS_READ_FOLIO, 1, [read_folio exists])
   29         ],[
   30                 AC_MSG_RESULT([no])
   31         ])
   32 ])

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