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>

1 files changed, 17 insertions, 0 deletions

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 84a7bd4db5da..6b27f74bb346 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -37,6 +37,7 @@
 
 #include "alloc.h"
 #include "aops.h"
+#include "blockcheck.h"
 #include "dlmglue.h"
 #include "extent_map.h"
 #include "inode.h"
@@ -682,12 +683,28 @@ struct ocfs2_merge_ctxt {
 static int ocfs2_validate_extent_block(struct super_block *sb,
                                        struct buffer_head *bh)
 {
+        int rc;
         struct ocfs2_extent_block *eb =
                 (struct ocfs2_extent_block *)bh->b_data;
 
         mlog(0, "Validating extent block %llu\n",
              (unsigned long long)bh->b_blocknr);
 
+        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, &eb->h_check);
+        if (rc)
+                return rc;
+
+        /*
+         * Errors after here are fatal.
+         */
+
         if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
                 ocfs2_error(sb,
                             "Extent block #%llu has bad signature %.*s",