[RFC PATCH 09/20] famfs: Add super_operations

John Groves
2024-02-23T17:42:44Z

Introduce the famfs superblock operations

Signed-off-by: John Groves <john@groves.net>
---
fs/famfs/famfs_inode.c | 72 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 72 insertions(+)
create mode 100644 fs/famfs/famfs_inode.c

diff --git a/fs/famfs/famfs_inode.c b/fs/famfs/famfs_inode.c
new file mode 100644
index 000000000000..3329aff000d1
--- /dev/null
+++ b/fs/famfs/famfs_inode.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * famfs - dax file system for shared fabric-attached memory
+ *
+ * Copyright 2023-2024 Micron Technology, inc
+ *
+ * This file system, originally based on ramfs the dax support from xfs,
+ * is intended to allow multiple host systems to mount a common file system
+ * view of dax files that map to shared memory.
+ */
+
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/highmem.h>
+#include <linux/time.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/backing-dev.h>
+#include <linux/sched.h>
+#include <linux/parser.h>
+#include <linux/magic.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
+#include <linux/seq_file.h>
+#include <linux/dax.h>
+#include <linux/hugetlb.h>
+#include <linux/uio.h>
+#include <linux/iomap.h>
+#include <linux/path.h>
+#include <linux/namei.h>
+#include <linux/pfn_t.h>
+#include <linux/blkdev.h>
+
+#include "famfs_internal.h"
+
+#define FAMFS_DEFAULT_MODE 0755
+
+static const struct super_operations famfs_ops;
+static const struct inode_operations famfs_file_inode_operations;
+static const struct inode_operations famfs_dir_inode_operations;
+
+/**********************************************************************************
+ * famfs super_operations
+ *
+ * TODO: implement a famfs_statfs() that shows size, free and available space, etc.
+ */
+
+/**
+ * famfs_show_options() - Display the mount options in /proc/mounts.
+ */
+static int famfs_show_options(
+ struct seq_file *m,
+ struct dentry *root)
+{
+ struct famfs_fs_info *fsi = root->d_sb->s_fs_info;
+
+ if (fsi->mount_opts.mode != FAMFS_DEFAULT_MODE)
+ seq_printf(m, ",mode=%o", fsi->mount_opts.mode);
+
+ return 0;
+}
+
+static const struct super_operations famfs_ops = {
+ .statfs = simple_statfs,
+ .drop_inode = generic_delete_inode,
+ .show_options = famfs_show_options,
+};
+
+
+MODULE_LICENSE("GPL");
--
2.43.0