bcachefs: Fixes for building in userspace

 - Marking a non-static function as inline doesn't actually work and is
   now causing problems - drop that

 - Introduce BCACHEFS_LOG_PREFIX for when we want to prefix log messages
   with bcachefs (filesystem name)

 - Userspace doesn't have real percpu variables (maybe we can get this
   fixed someday), put an #ifdef around bch2_disk_reservation_add()
   fastpath

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
diff --git a/fs/bcachefs/bcachefs.h b/fs/bcachefs/bcachefs.h
index c041625..90a1bd1 100644
--- a/fs/bcachefs/bcachefs.h
+++ b/fs/bcachefs/bcachefs.h
@@ -226,6 +226,10 @@ do {									\
 	 dynamic_fault("bcachefs:meta:write:" name)
 
 #ifdef __KERNEL__
+#define BCACHEFS_LOG_PREFIX
+#endif
+
+#ifdef BCACHEFS_LOG_PREFIX
 #define bch2_log_msg(_c, fmt)		"bcachefs (%s): " fmt, ((_c)->name)
 #define bch2_fmt(_c, fmt)		bch2_log_msg(_c, fmt "\n")
 #define bch2_fmt_inum(_c, _inum, fmt)	"bcachefs (%s inum %llu): " fmt "\n", ((_c)->name), (_inum)