1 files changed, 53 insertions, 0 deletions
diff --git a/fs/freevxfs/vxfs_immed.c b/fs/freevxfs/vxfs_immed.c
new file mode 100644
index 000000000..9b49ec36e
--- /dev/null
+++ b/fs/freevxfs/vxfs_immed.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2000-2001 Christoph Hellwig.
+ */
+
+/*
+ * Veritas filesystem driver - support for 'immed' inodes.
+ */
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+
+#include "vxfs.h"
+#include "vxfs_extern.h"
+#include "vxfs_inode.h"
+
+/**
+ * vxfs_immed_read_folio - read part of an immed inode into pagecache
+ * @file:	file context (unused)
+ * @folio:	folio to fill in.
+ *
+ * Description:
+ *   vxfs_immed_read_folio reads a part of the immed area of the
+ *   file that hosts @folio into the pagecache.
+ *
+ * Returns:
+ *   Zero on success, else a negative error code.
+ *
+ * Locking status:
+ *   @folio is locked and will be unlocked.
+ */
+static int vxfs_immed_read_folio(struct file *fp, struct folio *folio)
+{
+	struct vxfs_inode_info *vip = VXFS_INO(folio->mapping->host);
+	void *src = vip->vii_immed.vi_immed + folio_pos(folio);
+	unsigned long i;
+
+	for (i = 0; i < folio_nr_pages(folio); i++) {
+		memcpy_to_page(folio_page(folio, i), 0, src, PAGE_SIZE);
+		src += PAGE_SIZE;
+	}
+
+	folio_mark_uptodate(folio);
+	folio_unlock(folio);
+
+	return 0;
+}
+
+/*
+ * Address space operations for immed files and directories.
+ */
+const struct address_space_operations vxfs_immed_aops = {
+	.read_folio =	vxfs_immed_read_folio,
+};