[PATCH] md: a couple of tidyups relating to the bitmap file.

1/ When init from disk, it is a BUG if there is nowhere
   to init from,
2/ use seq_path to print path in /proc/mdstat

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/md/bitmap.c

@@ -769,13 +769,7 @@ static int bitmap_init_from_disk(struct bitmap *bitmap)
 	chunks = bitmap->chunks;
 	file = bitmap->file;
 
-	if (!file) { /* no file, dirty all the in-memory bits */
-		printk(KERN_INFO "%s: no bitmap file, doing full recovery\n",
-			bmname(bitmap));
-		bitmap_set_memory_bits(bitmap, 0,
-				       chunks << CHUNK_BLOCK_SHIFT(bitmap), 1);
-		return 0;
-	}
+	BUG_ON(!file);
 
 #if INJECT_FAULTS_3
 	outofdate = 1;

drivers/md/md.c

@@ -3213,10 +3213,8 @@ static int md_seq_show(struct seq_file *seq, void *v)
 			seq_printf(seq, "\n       ");
 
 		if ((bitmap = mddev->bitmap)) {
-			char *buf, *path;
 			unsigned long chunk_kb;
 			unsigned long flags;
-			buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 			spin_lock_irqsave(&bitmap->lock, flags);
 			chunk_kb = bitmap->chunksize >> 10;
 			seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
@@ -3227,13 +3225,14 @@ static int md_seq_show(struct seq_file *seq, void *v)
 					<< (PAGE_SHIFT - 10),
 				chunk_kb ? chunk_kb : bitmap->chunksize,
 				chunk_kb ? "KB" : "B");
-			if (bitmap->file && buf) {
-				path = file_path(bitmap->file, buf, PAGE_SIZE);
-				seq_printf(seq, ", file: %s", path ? path : "");
+			if (bitmap->file) {
+				seq_printf(seq, ", file: ");
+				seq_path(seq, bitmap->file->f_vfsmnt,
+					 bitmap->file->f_dentry," \t\n");
 			}
+
 			seq_printf(seq, "\n");
 			spin_unlock_irqrestore(&bitmap->lock, flags);
-			kfree(buf);
 		}
 
 		seq_printf(seq, "\n");