linux-kernel - [RFC PATCH 17/20] famfs: Add module stuff

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Date: Fri, 23 Feb 2024 11:42:01 -0600
From: John Groves <John@...ves.net>
To: John Groves <jgroves@...ron.com>,
	Jonathan Corbet <corbet@....net>,
	Dan Williams <dan.j.williams@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>,
	Matthew Wilcox <willy@...radead.org>,
	linux-cxl@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	nvdimm@...ts.linux.dev
Cc: John@...ves.net,
	john@...alactic.com,
	Dave Chinner <david@...morbit.com>,
	Christoph Hellwig <hch@...radead.org>,
	dave.hansen@...ux.intel.com,
	gregory.price@...verge.com,
	John Groves <john@...ves.net>
Subject: [RFC PATCH 17/20] famfs: Add module stuff

This commit introduces the module init and exit machinery for famfs.

Signed-off-by: John Groves <john@...ves.net>
---
 fs/famfs/famfs_inode.c | 44 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/fs/famfs/famfs_inode.c b/fs/famfs/famfs_inode.c
index ab46ec50b70d..0d659820e8ff 100644
--- a/fs/famfs/famfs_inode.c
+++ b/fs/famfs/famfs_inode.c
@@ -462,4 +462,48 @@ static struct file_system_type famfs_fs_type = {
 	.fs_flags	  = FS_USERNS_MOUNT,
 };
 
+/*****************************************************************************************
+ * Module stuff
+ */
+static struct kobject *famfs_kobj;
+
+static int __init init_famfs_fs(void)
+{
+	int rc;
+
+#if defined(CONFIG_DEV_DAX_IOMAP)
+	pr_notice("%s: Your kernel supports famfs on /dev/dax\n", __func__);
+#else
+	pr_notice("%s: Your kernel does not support famfs on /dev/dax\n", __func__);
+#endif
+	famfs_kobj = kobject_create_and_add(MODULE_NAME, fs_kobj);
+	if (!famfs_kobj) {
+		pr_warn("Failed to create kobject\n");
+		return -ENOMEM;
+	}
+
+	rc = sysfs_create_group(famfs_kobj, &famfs_attr_group);
+	if (rc) {
+		kobject_put(famfs_kobj);
+		pr_warn("%s: Failed to create sysfs group\n", __func__);
+		return rc;
+	}
+
+	return register_filesystem(&famfs_fs_type);
+}
+
+static void
+__exit famfs_exit(void)
+{
+	sysfs_remove_group(famfs_kobj,  &famfs_attr_group);
+	kobject_put(famfs_kobj);
+	unregister_filesystem(&famfs_fs_type);
+	pr_info("%s: unregistered\n", __func__);
+}
+
+
+fs_initcall(init_famfs_fs);
+module_exit(famfs_exit);
+
+MODULE_AUTHOR("John Groves, Micron Technology");
 MODULE_LICENSE("GPL");
-- 
2.43.0