ext3: retry block allocation if new blocks are allocated from system zone

If the block allocator gets blocks out of system zone ext3 calls ext3_error.
But if the file system is mounted with errors=continue retry block allocation.
 We need to mark the system zone blocks as in use to make sure retry don't
pick them again

System zone is the block range mapping block bitmap, inode bitmap and inode
table.

[akpm@linux-foundation.org: fix typo in comment]
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/ext3/balloc.c

@@ -164,10 +164,11 @@ read_block_bitmap(struct super_block *sb, unsigned int block_group)
 			    block_group, le32_to_cpu(desc->bg_block_bitmap));
 		return NULL;
 	}
-	if (!ext3_valid_block_bitmap(sb, desc, block_group, bh)) {
-		brelse(bh);
-		return NULL;
-	}
+	ext3_valid_block_bitmap(sb, desc, block_group, bh);
+	/*
+	 * file system mounted not to panic on error, continue with corrupt
+	 * bitmap
+	 */
 	return bh;
 }
 /*
@@ -1641,7 +1642,11 @@ allocated:
 			    "Allocating block in system zone - "
 			    "blocks from "E3FSBLK", length %lu",
 			     ret_block, num);
-		goto out;
+		/*
+		 * claim_block() marked the blocks we allocated as in use. So we
+		 * may want to selectively mark some of the blocks as free.
+		 */
+		goto retry_alloc;
 	}
 
 	performed_allocation = 1;