3 files changed, 67 insertions, 19 deletions

diff --git a/config/kernel-mkdir.m4 b/config/kernel-mkdir.m4
index 8e084443c7b4..c1aebc387abe 100644
--- a/config/kernel-mkdir.m4
+++ b/config/kernel-mkdir.m4
@@ -3,6 +3,22 @@ dnl # Supported mkdir() interfaces checked newest to oldest.
 dnl #
 AC_DEFUN([ZFS_AC_KERNEL_SRC_MKDIR], [
 	dnl #
+	dnl # 6.15 API change
+	dnl # mkdir() returns struct dentry *
+	dnl #
+	ZFS_LINUX_TEST_SRC([mkdir_return_dentry], [
+		#include <linux/fs.h>
+
+		static struct dentry *mkdir(struct mnt_idmap *idmap,
+			struct inode *inode, struct dentry *dentry,
+			umode_t umode) { return dentry; }
+		static const struct inode_operations
+		    iops __attribute__ ((unused)) = {
+			.mkdir = mkdir,
+		};
+	],[])
+
+	dnl #
 	dnl # 6.3 API change
 	dnl # mkdir() takes struct mnt_idmap * as the first arg
 	dnl #
@@ -59,29 +75,40 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_MKDIR], [
 
 AC_DEFUN([ZFS_AC_KERNEL_MKDIR], [
 	dnl #
-	dnl # 6.3 API change
-	dnl # mkdir() takes struct mnt_idmap * as the first arg
+	dnl # 6.15 API change
+	dnl # mkdir() returns struct dentry *
 	dnl #
-	AC_MSG_CHECKING([whether iops->mkdir() takes struct mnt_idmap*])
-	ZFS_LINUX_TEST_RESULT([mkdir_mnt_idmap], [
+	AC_MSG_CHECKING([whether iops->mkdir() returns struct dentry*])
+	ZFS_LINUX_TEST_RESULT([mkdir_return_dentry], [
 		AC_MSG_RESULT(yes)
-		AC_DEFINE(HAVE_IOPS_MKDIR_IDMAP, 1,
-		    [iops->mkdir() takes struct mnt_idmap*])
+		AC_DEFINE(HAVE_IOPS_MKDIR_DENTRY, 1,
+		    [iops->mkdir() returns struct dentry*])
 	],[
-		AC_MSG_RESULT(no)
-
 		dnl #
-		dnl # 5.12 API change
-		dnl # The struct user_namespace arg was added as the first argument to
-		dnl # mkdir() of the iops structure.
+		dnl # 6.3 API change
+		dnl # mkdir() takes struct mnt_idmap * as the first arg
 		dnl #
-		AC_MSG_CHECKING([whether iops->mkdir() takes struct user_namespace*])
-		ZFS_LINUX_TEST_RESULT([mkdir_user_namespace], [
+		AC_MSG_CHECKING([whether iops->mkdir() takes struct mnt_idmap*])
+		ZFS_LINUX_TEST_RESULT([mkdir_mnt_idmap], [
 			AC_MSG_RESULT(yes)
-			AC_DEFINE(HAVE_IOPS_MKDIR_USERNS, 1,
-			    [iops->mkdir() takes struct user_namespace*])
+			AC_DEFINE(HAVE_IOPS_MKDIR_IDMAP, 1,
+			    [iops->mkdir() takes struct mnt_idmap*])
 		],[
 			AC_MSG_RESULT(no)
+
+			dnl #
+			dnl # 5.12 API change
+			dnl # The struct user_namespace arg was added as the first argument to
+			dnl # mkdir() of the iops structure.
+			dnl #
+			AC_MSG_CHECKING([whether iops->mkdir() takes struct user_namespace*])
+			ZFS_LINUX_TEST_RESULT([mkdir_user_namespace], [
+				AC_MSG_RESULT(yes)
+				AC_DEFINE(HAVE_IOPS_MKDIR_USERNS, 1,
+				    [iops->mkdir() takes struct user_namespace*])
+			],[
+				AC_MSG_RESULT(no)
+			])
 		])
 	])
 ])
diff --git a/module/os/linux/zfs/zpl_ctldir.c b/module/os/linux/zfs/zpl_ctldir.c
index d6a755af6b2d..a7fdb8f28009 100644
--- a/module/os/linux/zfs/zpl_ctldir.c
+++ b/module/os/linux/zfs/zpl_ctldir.c
@@ -336,14 +336,20 @@ zpl_snapdir_rmdir(struct inode *dip, struct dentry *dentry)
 	return (error);
 }
 
+#if defined(HAVE_IOPS_MKDIR_USERNS)
 static int
-#ifdef HAVE_IOPS_MKDIR_USERNS
 zpl_snapdir_mkdir(struct user_namespace *user_ns, struct inode *dip,
     struct dentry *dentry, umode_t mode)
 #elif defined(HAVE_IOPS_MKDIR_IDMAP)
+static int
+zpl_snapdir_mkdir(struct mnt_idmap *user_ns, struct inode *dip,
+    struct dentry *dentry, umode_t mode)
+#elif defined(HAVE_IOPS_MKDIR_DENTRY)
+static struct dentry *
 zpl_snapdir_mkdir(struct mnt_idmap *user_ns, struct inode *dip,
     struct dentry *dentry, umode_t mode)
 #else
+static int
 zpl_snapdir_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode)
 #endif
 {
@@ -371,7 +377,11 @@ zpl_snapdir_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode)
 	ASSERT3S(error, <=, 0);
 	crfree(cr);
 
+#if defined(HAVE_IOPS_MKDIR_DENTRY)
+	return (ERR_PTR(error));
+#else
 	return (error);
+#endif
 }
 
 /*
diff --git a/module/os/linux/zfs/zpl_inode.c b/module/os/linux/zfs/zpl_inode.c
index 8386fc2ae0ce..56ef3a7d1212 100644
--- a/module/os/linux/zfs/zpl_inode.c
+++ b/module/os/linux/zfs/zpl_inode.c
@@ -333,14 +333,20 @@ zpl_unlink(struct inode *dir, struct dentry *dentry)
 	return (error);
 }
 
+#if defined(HAVE_IOPS_MKDIR_USERNS)
 static int
-#ifdef HAVE_IOPS_MKDIR_USERNS
 zpl_mkdir(struct user_namespace *user_ns, struct inode *dir,
     struct dentry *dentry, umode_t mode)
 #elif defined(HAVE_IOPS_MKDIR_IDMAP)
+static int
+zpl_mkdir(struct mnt_idmap *user_ns, struct inode *dir,
+    struct dentry *dentry, umode_t mode)
+#elif defined(HAVE_IOPS_MKDIR_DENTRY)
+static struct dentry *
 zpl_mkdir(struct mnt_idmap *user_ns, struct inode *dir,
     struct dentry *dentry, umode_t mode)
 #else
+static int
 zpl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 #endif
 {
@@ -349,7 +355,8 @@ zpl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 	znode_t *zp;
 	int error;
 	fstrans_cookie_t cookie;
-#if !(defined(HAVE_IOPS_MKDIR_USERNS) || defined(HAVE_IOPS_MKDIR_IDMAP))
+#if !(defined(HAVE_IOPS_MKDIR_USERNS) || \
+	defined(HAVE_IOPS_MKDIR_IDMAP) || defined(HAVE_IOPS_MKDIR_DENTRY))
 	zidmap_t *user_ns = kcred->user_ns;
 #endif
 
@@ -377,9 +384,13 @@ zpl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 	spl_fstrans_unmark(cookie);
 	kmem_free(vap, sizeof (vattr_t));
 	crfree(cr);
-	ASSERT3S(error, <=, 0);
 
+	ASSERT3S(error, <=, 0);
+#if defined(HAVE_IOPS_MKDIR_DENTRY)
+	return (error != 0 ? ERR_PTR(error) : NULL);
+#else
 	return (error);
+#endif
 }
 
 static int