Implement generating an inode table for NFS export

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

2 files changed, 37 insertions, 0 deletions

diff --git a/lib/Makemodule.am b/lib/Makemodule.am
index 7e6ca82..ab2030c 100644
--- a/lib/Makemodule.am
+++ b/lib/Makemodule.am
@@ -35,6 +35,7 @@ libsquashfs_a_SOURCES += lib/sqfs/deserialize_fstree.c
 libsquashfs_a_SOURCES += lib/sqfs/data_writer.c lib/sqfs/write_xattr.c
 libsquashfs_a_SOURCES += include/data_writer.h include/frag_reader.h
 libsquashfs_a_SOURCES += include/data_reader.h lib/sqfs/data_reader.c
+libsquashfs_a_SOURCES += lib/sqfs/write_export_table.c
 
 libutil_a_SOURCES = lib/util/canonicalize_name.c lib/util/write_data.c
 libutil_a_SOURCES += lib/util/read_data.c include/util.h
diff --git a/lib/sqfs/write_export_table.c b/lib/sqfs/write_export_table.c
new file mode 100644
index 0000000..eee4e01
--- /dev/null
+++ b/lib/sqfs/write_export_table.c
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include "highlevel.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+
+int write_export_table(int outfd, fstree_t *fs, sqfs_super_t *super,
+		       compressor_t *cmp)
+{
+	uint64_t *table, start;
+	size_t i;
+	int ret;
+
+	table = malloc(sizeof(uint64_t) * fs->inode_tbl_size);
+
+	if (table == NULL) {
+		perror("Allocating NFS export table");
+		return -1;
+	}
+
+	for (i = 0; i < fs->inode_tbl_size; ++i) {
+		if (fs->inode_table[i] == NULL) {
+			table[i] = 0xFFFFFFFFFFFFFFFF;
+		} else {
+			table[i] = htole64(fs->inode_table[i]->inode_ref);
+		}
+	}
+
+	ret = sqfs_write_table(outfd, super, table, sizeof(table[0]),
+			       fs->inode_tbl_size, &start, cmp);
+
+	super->export_table_start = start;
+	super->flags |= SQFS_FLAG_EXPORTABLE;
+	free(table);
+	return ret;
+}