[PATCH] register_filesystem() must return -EEXIST if the filesystem with the same name is already registered

[Hareesh Nagarajan <hnagar2@gmail.com>]

If we have a look at the register_filesystem() function defined in 
fs/filesystems.c, we see that if a filesystem with a same name has 
already been registered then the find_filesystem() function will return 
NON-NULL otherwise it will return NULL.

Hence, register_filesystem() should return EEXIST instead of EBUSY. 
Returning EBUSY is misleading (unless of course I'm missing something 
obvious) to the caller of register_filesystem().

Thanks,

Hareesh Nagarajan

--- linux-2.6.13.4/fs/filesystems.c	2005-10-10 13:54:29.000000000 -0500
+++ linux-2.6.13.4-edit/fs/filesystems.c	2005-11-02 02:33:30.685600000 -0600
@@ -76,7 +76,7 @@
 	write_lock(&file_systems_lock);
 	p = find_filesystem(fs->name);
 	if (*p)
-		res = -EBUSY;
+		res = -EEXIST;
 	else
 		*p = fs;
 	write_unlock(&file_systems_lock);