Btrfs: Add debugging checks to track down corrupted metadata

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 6a218f792e59..8e7a938bfbc7 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -250,7 +250,7 @@ static int btree_read_extent_buffer_pages(struct btrfs_root *root,
                 if (!ret &&
                     !verify_parent_transid(io_tree, eb, parent_transid))
                         return ret;
-
+printk("read extent buffer pages failed with ret %d mirror no %d\n", ret, mirror_num);
                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
                                               eb->start, eb->len);
                 if (num_copies == 1)
@@ -348,6 +348,9 @@ int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
 
         found_start = btrfs_header_bytenr(eb);
         if (found_start != start) {
+                printk("bad tree block start %llu %llu\n",
+                       (unsigned long long)found_start,
+                       (unsigned long long)eb->start);
                 ret = -EIO;
                 goto err;
         }
@@ -709,6 +712,8 @@ struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
 
         if (ret == 0) {
                 buf->flags |= EXTENT_UPTODATE;
+        } else {
+                WARN_ON(1);
         }
         return buf;