Btrfs: convert printk to btrfs_ and fix BTRFS prefix

Convert all applicable cases of printk and pr_* to the btrfs_* macros.

Fix all uses of the BTRFS prefix.

Signed-off-by: Frank Holton <fholton@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 6f38488..9d84658 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -246,8 +246,8 @@
 						offset + bvec->bv_len - 1,
 						EXTENT_NODATASUM, GFP_NOFS);
 				} else {
-					printk(KERN_INFO "btrfs no csum found "
-					       "for inode %llu start %llu\n",
+					btrfs_info(BTRFS_I(inode)->root->fs_info,
+						   "no csum found for inode %llu start %llu",
 					       btrfs_ino(inode), offset);
 				}
 				item = NULL;