Btrfs: Add some extra debugging around file data checksum failures

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

2 files changed, 9 insertions, 3 deletions

diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 614176e52851..3ebbc058d082 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -261,6 +261,10 @@ csum:
 found:
         csum_result = btrfs_csum_data(root, data, csum_result, len);
         btrfs_csum_final(csum_result, (char *)&csum_result);
+        if (csum_result == 0) {
+                printk("csum result is 0 for inode %lu offset %Lu\n", inode->i_ino, offset);
+        }
+
         write_extent_buffer(leaf, &csum_result, (unsigned long)item,
                             BTRFS_CRC32_SIZE);
         btrfs_mark_buffer_dirty(path->nodes[0]);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 026bc9c4c90d..484551274100 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -318,6 +318,7 @@ int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
                 if (ret == -ENOENT || ret == -EFBIG)
                         ret = 0;
                 csum = 0;
+                printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start);
                 goto out;
         }
         read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
@@ -336,7 +337,7 @@ int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
         struct inode *inode = page->mapping->host;
         struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
         char *kaddr;
-        u64 private;
+        u64 private = ~(u32)0;
         int ret;
         struct btrfs_root *root = BTRFS_I(inode)->root;
         u32 csum = ~(u32)0;
@@ -362,8 +363,9 @@ int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
         return 0;
 
 zeroit:
-        printk("btrfs csum failed ino %lu off %llu\n",
-               page->mapping->host->i_ino, (unsigned long long)start);
+        printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
+               page->mapping->host->i_ino, (unsigned long long)start, csum,
+               private);
         memset(kaddr + offset, 1, end - start + 1);
         flush_dcache_page(page);
         kunmap_atomic(kaddr, KM_IRQ0);