reiserfs: rework reiserfs_warning

ReiserFS warnings can be somewhat inconsistent.
In some cases:
 * a unique identifier may be associated with it
 * the function name may be included
 * the device may be printed separately

This patch aims to make warnings more consistent. reiserfs_warning() prints
the device name, so printing it a second time is not required. The function
name for a warning is always helpful in debugging, so it is now automatically
inserted into the output. Hans has stated that every warning should have
a unique identifier. Some cases lack them, others really shouldn't have them.
reiserfs_warning() now expects an id associated with each message. In the
rare case where one isn't needed, "" will suffice.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/reiserfs/objectid.c b/fs/reiserfs/objectid.c
index ea0cf8c..a3a5f43 100644
--- a/fs/reiserfs/objectid.c
+++ b/fs/reiserfs/objectid.c
@@ -61,7 +61,7 @@
 	/* comment needed -Hans */
 	unused_objectid = le32_to_cpu(map[1]);
 	if (unused_objectid == U32_MAX) {
-		reiserfs_warning(s, "%s: no more object ids", __func__);
+		reiserfs_warning(s, "reiserfs-15100", "no more object ids");
 		reiserfs_restore_prepared_buffer(s, SB_BUFFER_WITH_SB(s));
 		return 0;
 	}
@@ -160,8 +160,7 @@
 		i += 2;
 	}
 
-	reiserfs_warning(s,
-			 "vs-15011: reiserfs_release_objectid: tried to free free object id (%lu)",
+	reiserfs_warning(s, "vs-15011", "tried to free free object id (%lu)",
 			 (long unsigned)objectid_to_release);
 }