ocfs2: block read meta ecc.

Add block check calls to the read_block validate functions.  This is the
almost all of the read-side checking of metaecc.  xattr buckets are not checked
yet.   Writes are also unchecked, and so a read-write mount will quickly fail.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

fs/ocfs2/inode.c

@@ -38,6 +38,7 @@
 #include "ocfs2.h"
 
 #include "alloc.h"
+#include "blockcheck.h"
 #include "dlmglue.h"
 #include "extent_map.h"
 #include "file.h"
@@ -1262,7 +1263,7 @@ void ocfs2_refresh_inode(struct inode *inode,
 int ocfs2_validate_inode_block(struct super_block *sb,
 			       struct buffer_head *bh)
 {
-	int rc = -EINVAL;
+	int rc;
 	struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
 
 	mlog(0, "Validating dinode %llu\n",
@@ -1270,6 +1271,21 @@ int ocfs2_validate_inode_block(struct super_block *sb,
 
 	BUG_ON(!buffer_uptodate(bh));
 
+	/*
+	 * If the ecc fails, we return the error but otherwise
+	 * leave the filesystem running.  We know any error is
+	 * local to this block.
+	 */
+	rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &di->i_check);
+	if (rc)
+		goto bail;
+
+	/*
+	 * Errors after here are fatal.
+	 */
+
+	rc = -EINVAL;
+
 	if (!OCFS2_IS_VALID_DINODE(di)) {
 		ocfs2_error(sb, "Invalid dinode #%llu: signature = %.*s\n",
 			    (unsigned long long)bh->b_blocknr, 7,