diff options
Diffstat (limited to 'fs/btrfs/disk-io.c')
| -rw-r--r-- | fs/btrfs/disk-io.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index abc929a47d4b..1c8c94dbe984 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -212,15 +212,16 @@ static void csum_tree_block(struct extent_buffer *buf, u8 *result) { 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]); |