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Linux 7.1: access dentry d_alias directly

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The d_u union introduced in 3.18 is now anonymous, so we need to detect
it and decide the right way to name d_alias.

Note that we used to have support for both names to support kernels
before 3.18, so this commit is effectively reverting the commit that
removed that support, efc293e371.

Sponsored-by: TrueNAS
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@truenas.com>
Closes #18471
This commit is contained in:
Rob Norris
2026-05-02 04:52:57 +10:00
committed by Tony Hutter
parent fc87e269e2
commit 65b4a5c551
3 changed files with 36 additions and 0 deletions
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config/kernel-dentry-alias.m4
+32
View File
@@ -0,0 +1,32 @@
dnl # SPDX-License-Identifier: CDDL-1.0
dnl #
dnl # 7.1 API change
dnl # d_u union in struct dentry is now anonmymous, so d_alias must be
dnl # named directly
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_DENTRY_ALIAS_D_U], [
ZFS_LINUX_TEST_SRC([dentry_alias_d_u], [
#include <linux/fs.h>
#include <linux/dcache.h>
#include <linux/list.h>
], [
struct inode *inode __attribute__ ((unused)) = NULL;
struct dentry *dentry __attribute__ ((unused)) = NULL;
hlist_for_each_entry(dentry, &inode->i_dentry,
d_u.d_alias) {
d_drop(dentry);
}
])
])
AC_DEFUN([ZFS_AC_KERNEL_DENTRY_ALIAS_D_U], [
AC_MSG_CHECKING([whether dentry aliases are in d_u member])
ZFS_LINUX_TEST_RESULT([dentry_alias_d_u], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_DENTRY_D_U_ALIASES, 1,
[dentry aliases are in d_u member])
],[
AC_MSG_RESULT(no)
])
])
config/kernel.m4
+2
View File
@@ -73,6 +73,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC_SETATTR_PREPARE
ZFS_AC_KERNEL_SRC_INSERT_INODE_LOCKED
ZFS_AC_KERNEL_SRC_DENTRY
ZFS_AC_KERNEL_SRC_DENTRY_ALIAS_D_U
ZFS_AC_KERNEL_SRC_TRUNCATE_SETSIZE
ZFS_AC_KERNEL_SRC_SECURITY_INODE
ZFS_AC_KERNEL_SRC_FS_CONTEXT
@@ -196,6 +197,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_SETATTR_PREPARE
ZFS_AC_KERNEL_INSERT_INODE_LOCKED
ZFS_AC_KERNEL_DENTRY
ZFS_AC_KERNEL_DENTRY_ALIAS_D_U
ZFS_AC_KERNEL_TRUNCATE_SETSIZE
ZFS_AC_KERNEL_SECURITY_INODE
ZFS_AC_KERNEL_FS_CONTEXT