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Linux 6.14: dops->d_revalidate now takes four args

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This is a convenience for filesystems that need the inode of their
parent or their own name, as its often complicated to get that
information. We don't need those things, so this is just detecting which
prototype is expected and adjusting our callback to match.

Sponsored-by: https://despairlabs.com/sponsor/
Signed-off-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
This commit is contained in:
Rob Norris 2025-02-05 17:14:20 +11:00 committed by Ameer Hamza
parent 3b5c3f52d2
commit 51bec16060
2 changed files with 45 additions and 2 deletions
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41
config/kernel-automount.m4
View File

@ -5,7 +5,7 @@ dnl # solution to handling automounts. Prior to this cifs/nfs clients
dnl # which required automount support would abuse the follow_link()
dnl # operation on directories for this purpose.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_AUTOMOUNT], [
AC_DEFUN([ZFS_AC_KERNEL_SRC_D_AUTOMOUNT], [
ZFS_LINUX_TEST_SRC([dentry_operations_d_automount], [
#include <linux/dcache.h>
static struct vfsmount *d_automount(struct path *p) { return NULL; }
@ -15,7 +15,7 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_AUTOMOUNT], [
])
])
AC_DEFUN([ZFS_AC_KERNEL_AUTOMOUNT], [
AC_DEFUN([ZFS_AC_KERNEL_D_AUTOMOUNT], [
AC_MSG_CHECKING([whether dops->d_automount() exists])
ZFS_LINUX_TEST_RESULT([dentry_operations_d_automount], [
AC_MSG_RESULT(yes)
@ -23,3 +23,40 @@ AC_DEFUN([ZFS_AC_KERNEL_AUTOMOUNT], [
ZFS_LINUX_TEST_ERROR([dops->d_automount()])
])
])
dnl #
dnl # 6.14 API change
dnl # dops->d_revalidate now has four args.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_D_REVALIDATE_4ARGS], [
ZFS_LINUX_TEST_SRC([dentry_operations_d_revalidate_4args], [
#include <linux/dcache.h>
static int d_revalidate(struct inode *dir,
const struct qstr *name, struct dentry *dentry,
unsigned int fl) { return 0; }
struct dentry_operations dops __attribute__ ((unused)) = {
.d_revalidate = d_revalidate,
};
])
])
AC_DEFUN([ZFS_AC_KERNEL_D_REVALIDATE_4ARGS], [
AC_MSG_CHECKING([whether dops->d_revalidate() takes 4 args])
ZFS_LINUX_TEST_RESULT([dentry_operations_d_revalidate_4args], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_D_REVALIDATE_4ARGS, 1,
[dops->d_revalidate() takes 4 args])
],[
AC_MSG_RESULT(no)
])
])
AC_DEFUN([ZFS_AC_KERNEL_SRC_AUTOMOUNT], [
ZFS_AC_KERNEL_SRC_D_AUTOMOUNT
ZFS_AC_KERNEL_SRC_D_REVALIDATE_4ARGS
])
AC_DEFUN([ZFS_AC_KERNEL_AUTOMOUNT], [
ZFS_AC_KERNEL_D_AUTOMOUNT
ZFS_AC_KERNEL_D_REVALIDATE_4ARGS
])

6
module/os/linux/zfs/zpl_ctldir.c
View File

@ -189,8 +189,14 @@ zpl_snapdir_automount(struct path *path)
* as of the 3.18 kernel revaliding the mountpoint dentry will result in
* the snapshot being immediately unmounted.
*/
#ifdef HAVE_D_REVALIDATE_4ARGS
static int
zpl_snapdir_revalidate(struct inode *dir, const struct qstr *name,
struct dentry *dentry, unsigned int flags)
#else
static int
zpl_snapdir_revalidate(struct dentry *dentry, unsigned int flags)
#endif
{
return (!!dentry->d_inode);
}