[PATCH v2 29/31] ocfs2: check chain list dinodes in online filecheck

[Joseph Qi <joseph.qi@linux.alibaba.com>]

Wire the chain-list guard and its three sub-checks into the filecheck
validator: cl_count against ocfs2_chain_recs_per_inode(),
cl_next_free_rec against cl_count, and cl_bpc against the cluster to
block size ratio.

The bits-per-cluster predicate keeps the two bitmap_blkno conditions, so
the global bitmap inode itself remains exempt.

Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
---
 fs/ocfs2/inode.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 1679ed7d09db..6865f0000e6f 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -2165,6 +2165,37 @@ static int ocfs2_filecheck_validate_inode_block(struct super_block *sb,
 		}
 	}
 
+	if (ocfs2_dinode_has_chain_list(di)) {
+		struct ocfs2_chain_list *cl = &di->id2.i_chain;
+
+		if (ocfs2_dinode_has_bad_chain_count(sb, di)) {
+			mlog(ML_ERROR,
+			     "Filecheck: invalid dinode #%llu: chain list count %u\n",
+			     (unsigned long long)bh->b_blocknr,
+			     le16_to_cpu(cl->cl_count));
+			rc = -OCFS2_FILECHECK_ERR_INVALIDINO;
+			goto bail;
+		}
+
+		if (ocfs2_dinode_has_bad_chain_next_free(di)) {
+			mlog(ML_ERROR,
+			     "Filecheck: invalid dinode #%llu: chain list index %u\n",
+			     (unsigned long long)bh->b_blocknr,
+			     le16_to_cpu(cl->cl_next_free_rec));
+			rc = -OCFS2_FILECHECK_ERR_INVALIDINO;
+			goto bail;
+		}
+
+		if (ocfs2_dinode_has_bad_chain_bpc(sb, di)) {
+			mlog(ML_ERROR,
+			     "Filecheck: invalid dinode #%llu: bits per cluster %u\n",
+			     (unsigned long long)bh->b_blocknr,
+			     le16_to_cpu(cl->cl_bpc));
+			rc = -OCFS2_FILECHECK_ERR_INVALIDINO;
+			goto bail;
+		}
+	}
+
 bail:
 	return rc;
 }
-- 
2.39.3