From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pat LaVarre <p.lavarre@ieee.org>
Subject: Re: favourite vfs globals
Date: 28 Nov 2003 15:42:57 -0700
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> > > > Which vfs globals are the most fun, in lk like 2.6.0-test11?

"That question I can't yet answer, but":

> > > > ... we ... see the global variables of modules ...
> > > ... when the modules share those variables with non-module code

Success!  Thanks again for the hints.

(gdb) print /x udf_gdb
$1 = 0xcafefacf
(gdb) #
(gdb) print udf_gdb_fstype
$3 = (struct file_system_type *) 0xdf9639c0
(gdb) #
(gdb) print *udf_gdb_fstype
$4 = {name = 0xdf95fc65 "udf", fs_flags = 1, get_sb = 0xdf9592d4,
  kill_sb = 0xc0153d9c <kill_block_super>, owner = 0xdf963e80, next = 0x0,
  fs_supers = {next = 0xd5fa7d5c, prev = 0xd5fa7d5c}}
(gdb)

diff -Nur linux-2.6.0-test11/fs/udf/super.c linux/fs/udf/super.c
--- linux-2.6.0-test11/fs/udf/super.c	2003-11-26 13:44:41.000000000 -0700
+++ linux/fs/udf/super.c	2003-11-28 15:23:55.000000000 -0700
@@ -189,10 +189,19 @@
 	struct nls_table *nls_map;
 };
 
+extern int udf_gdb;
+extern struct file_system_type * udf_gdb_fstype;
+
 static int __init init_udf_fs(void)
 {
 	int err;
 	printk(KERN_NOTICE "udf: registering filesystem\n");
+
+	printk(KERN_NOTICE "udf: before incrementing hello_gdb\n");
+	udf_gdb_fstype = &udf_fstype;
+	++udf_gdb;
+	printk(KERN_NOTICE "udf: after incrementing hello_gdb\n");
+
 	err = init_inodecache();
 	if (err)
 		goto out1;
diff -Nur linux-2.6.0-test11/drivers/block/scsi_ioctl.c linux/drivers/block/scsi_ioctl.c
diff -Nur linux-2.6.0-test11/drivers/block/ll_rw_blk.c linux/drivers/block/ll_rw_blk.c
--- linux-2.6.0-test11/drivers/block/ll_rw_blk.c	2003-11-26 13:42:58.000000000 -0700
+++ linux/drivers/block/ll_rw_blk.c	2003-11-28 15:24:06.000000000 -0700
@@ -2445,6 +2445,11 @@
 	}
 }
 
+int udf_gdb = 0xCAFEFACE;
+struct file_system_type * udf_gdb_fstype;
+EXPORT_SYMBOL(udf_gdb);
+EXPORT_SYMBOL(udf_gdb_fstype);
+
 static int __end_that_request_first(struct request *req, int uptodate,
 				    int nr_bytes)
 {