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Commit aadfeb6e authored by Chris Mason's avatar Chris Mason
Browse files

Btrfs: Add some extra debugging around file data checksum failures 



Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent c2a8b6e1

fs/btrfs/file-item.c

+4 −0
Original line number Diff line number Diff line
@@ -261,6 +261,10 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans, 
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]);

fs/btrfs/inode.c

+5 −3
Original line number Diff line number Diff line
@@ -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);