return bdev;
 
 fail:
-       printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
+       printk(KERN_ERR "EXT4-fs: failed to open journal device %s: %ld\n",
                        __bdevname(dev, b), PTR_ERR(bdev));
        return NULL;
 }
        if (ext4_blocks_count(es) > 0xffffffffULL &&
            !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
                                       JBD2_FEATURE_INCOMPAT_64BIT)) {
-               printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
+               printk(KERN_ERR "EXT4-fs: Failed to set 64-bit journal feature\n");
                goto failed_mount4;
        }
 
 
        if (bd_claim(bdev, sb)) {
                printk(KERN_ERR
-                       "EXT4: failed to claim external journal device.\n");
+                       "EXT4-fs: failed to claim external journal device.\n");
                blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
                return NULL;
        }
                 * be remapped.  Nothing we can do but to retry the
                 * write and hope for the best.
                 */
-               printk(KERN_ERR "ext4: previous I/O error to "
+               printk(KERN_ERR "EXT4-fs: previous I/O error to "
                       "superblock detected for %s.\n", sb->s_id);
                clear_buffer_write_io_error(sbh);
                set_buffer_uptodate(sbh);
        if (sync) {
                sync_dirty_buffer(sbh);
                if (buffer_write_io_error(sbh)) {
-                       printk(KERN_ERR "ext4: I/O error while writing "
+                       printk(KERN_ERR "EXT4-fs: I/O error while writing "
                               "superblock for %s.\n", sb->s_id);
                        clear_buffer_write_io_error(sbh);
                        set_buffer_uptodate(sbh);