reiserfs: rework reiserfs_panic

ReiserFS panics 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/item_ops.c b/fs/reiserfs/item_ops.c
index 8a11cf3..72cb1cc 100644
--- a/fs/reiserfs/item_ops.c
+++ b/fs/reiserfs/item_ops.c
@@ -517,8 +517,9 @@
 		    ((is_affected
 		      && (vn->vn_mode == M_PASTE
 			  || vn->vn_mode == M_CUT)) ? insert_size : 0)) {
-			reiserfs_panic(NULL,
-				       "vs-8025: set_entry_sizes: (mode==%c, insert_size==%d), invalid length of directory item",
+			reiserfs_panic(NULL, "vs-8025", "(mode==%c, "
+				       "insert_size==%d), invalid length of "
+				       "directory item",
 				       vn->vn_mode, insert_size);
 		}
 	}
@@ -549,7 +550,8 @@
 	}
 
 	if (entries == dir_u->entry_count) {
-		reiserfs_panic(NULL, "free space %d, entry_count %d\n", free,
+		reiserfs_panic(NULL, "item_ops-1",
+			       "free space %d, entry_count %d", free,
 			       dir_u->entry_count);
 	}