{
struct btrfs_fs_info *fs_info = buf->fs_info;
const int num_pages = fs_info->nodesize >> PAGE_SHIFT;
+ const int first_page_part = min_t(u32, PAGE_SIZE, fs_info->nodesize);
SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
char *kaddr;
int i;
shash->tfm = fs_info->csum_shash;
crypto_shash_init(shash);
- kaddr = page_address(buf->pages[0]);
+ kaddr = page_address(buf->pages[0]) + offset_in_page(buf->start);
crypto_shash_update(shash, kaddr + BTRFS_CSUM_SIZE,
- PAGE_SIZE - BTRFS_CSUM_SIZE);
+ first_page_part - BTRFS_CSUM_SIZE);
for (i = 1; i < num_pages; i++) {
kaddr = page_address(buf->pages[i]);