GFS2: Use pr_<level> more consistently

Add pr_fmt, remove embedded "GFS2: " prefixes.
This now consistently emits lower case "gfs2: " for each message.

Other miscellanea around these changes:

o Add missing newlines
o Coalesce formats
o Realign arguments

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index 39c7081..1a349f9 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -53,6 +53,8 @@
  * but never before the maximum hash table size has been reached.
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/buffer_head.h>
@@ -507,8 +509,8 @@
 		goto error;
 	return 0;
 error:
-	pr_warn("gfs2_check_dirent: %s (%s)\n", msg,
-	       first ? "first in block" : "not first in block");
+	pr_warn("%s: %s (%s)\n",
+		__func__, msg, first ? "first in block" : "not first in block");
 	return -EIO;
 }
 
@@ -531,8 +533,7 @@
 	}
 	return offset;
 wrong_type:
-	pr_warn("gfs2_scan_dirent: wrong block type %u\n",
-	        be32_to_cpu(h->mh_type));
+	pr_warn("%s: wrong block type %u\n", __func__, be32_to_cpu(h->mh_type));
 	return -1;
 }
 
@@ -728,7 +729,7 @@
 
 	error = gfs2_meta_read(dip->i_gl, leaf_no, DIO_WAIT, bhp);
 	if (!error && gfs2_metatype_check(GFS2_SB(&dip->i_inode), *bhp, GFS2_METATYPE_LF)) {
-		/* printk(KERN_INFO "block num=%llu\n", leaf_no); */
+		/* pr_info("block num=%llu\n", leaf_no); */
 		error = -EIO;
 	}
 
@@ -1006,7 +1007,8 @@
 	len = 1 << (dip->i_depth - be16_to_cpu(oleaf->lf_depth));
 	half_len = len >> 1;
 	if (!half_len) {
-		pr_warn("i_depth %u lf_depth %u index %u\n", dip->i_depth, be16_to_cpu(oleaf->lf_depth), index);
+		pr_warn("i_depth %u lf_depth %u index %u\n",
+			dip->i_depth, be16_to_cpu(oleaf->lf_depth), index);
 		gfs2_consist_inode(dip);
 		error = -EIO;
 		goto fail_brelse;