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-inode-permission.m4

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    1 AC_DEFUN([ZFS_AC_KERNEL_SRC_PERMISSION], [
    2         dnl #
    3         dnl # 5.12 API change that added the struct user_namespace* arg
    4         dnl # to the front of this function type's arg list.
    5         dnl #
    6         ZFS_LINUX_TEST_SRC([permission_userns], [
    7                 #include <linux/fs.h>
    8                 #include <linux/sched.h>
    9 
   10                 int inode_permission(struct user_namespace *userns,
   11                     struct inode *inode, int mask) { return 0; }
   12 
   13                 static const struct inode_operations
   14                         iops __attribute__ ((unused)) = {
   15                         .permission             = inode_permission,
   16                 };
   17         ],[])
   18 ])
   19 
   20 AC_DEFUN([ZFS_AC_KERNEL_PERMISSION], [
   21         AC_MSG_CHECKING([whether iops->permission() takes struct user_namespace*])
   22         ZFS_LINUX_TEST_RESULT([permission_userns], [
   23                 AC_MSG_RESULT(yes)
   24                 AC_DEFINE(HAVE_IOPS_PERMISSION_USERNS, 1,
   25                    [iops->permission() takes struct user_namespace*])
   26         ],[
   27                 AC_MSG_RESULT(no)
   28         ])
   29 ])

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