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/file.c b/fs/reiserfs/file.c
index 3340841..47bab89 100644
--- a/fs/reiserfs/file.c
+++ b/fs/reiserfs/file.c
@@ -76,7 +76,7 @@
 			 * and let the admin know what is going on.
 			 */
 			igrab(inode);
-			reiserfs_warning(inode->i_sb,
+			reiserfs_warning(inode->i_sb, "clm-9001",
 					 "pinning inode %lu because the "
 					 "preallocation can't be freed",
 					 inode->i_ino);