nullfs

make.py

@@ -124,6 +124,10 @@ def sandbox2():
     goto('sandbox2')
     compile_to_bin('sandbox', ['sandbox.S'], ['-D_patch_start=start'])
 
+def nullfs():
+    goto('nullfs')
+    run(GCC, '-dynamiclib', '-o', 'nullfs.dylib', 'null_subr.c', 'null_vfsops.c', 'null_vnops.c', 'vfs_pasta.c', '-fwhole-program', '-combine', '-nostdinc', '-nodefaultlibs', '-lgcc', '-Wno-error', '-Wno-parentheses', '-Wno-format', '-I.', '-Ixnu', '-Ixnu/bsd', '-Ixnu/libkern', '-Ixnu/osfmk', '-Ixnu/bsd/i386', '-Ixnu/bsd/sys', '-Ixnu/EXTERNAL_HEADERS', '-Ixnu/osfmk/libsa', '-D__i386__', '-DKERNEL', '-DKERNEL_PRIVATE', '-DBSD_KERNEL_PRIVATE', '-D__APPLE_API_PRIVATE', '-DXNU_KERNEL_PRIVATE', '-flat_namespace', '-undefined', 'dynamic_lookup', '-fno-builtin-printf', '-DNULLFS_DIAGNOSTIC')
+
 def clean():
     autoclean()
 

nullfs/mount_nullfs/mount_nullfs.c → nullfs/mount_nullfs.c

@@ -1,5 +1,8 @@
 #include <sys/param.h>
 #include <sys/mount.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
 struct null_args {
     char        *target;    /* Target of loopback  */
 };
@@ -8,5 +11,6 @@ struct null_args {
 int main() {
     struct null_args args;
     args.target = "/y";
-    mount("loopback", "/x", 0, &args);
+    printf("%d ", mount("loopback", "/x", 0, &args));
+    printf("%s\n", strerror(errno));
 }

nullfs/null_subr.c

@@ -100,15 +100,15 @@ u_long null_node_hash;
 /*
  * Initialise cache headers
  */
-void
-nullfs_init()
+int nullfs_init(struct vfsconf *vfsconf)
 {
 
 #ifdef NULLFS_DIAGNOSTIC
     printf("nullfs_init\n");        /* printed during system boot */
 #endif
     //*((unsigned int *) 0xdeadbeef) = 0xf00df00d;
     null_node_hashtbl = hashinit(NNULLNODECACHE, M_CACHE, &null_node_hash);
+    return 0;
 }
 
 struct proc *curproc;