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btrfs: make csum_tree_block() handle node smaller than page

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For subpage size support, metadata blocks of nodesize are smaller than
one page and this needs to be handled when calculating the checksum.

The checksummed start and length need to be adjusted but only for the
first page:

- start is simply offset in the page

- length is nodesize (subpage) or PAGE_SIZE for all other cases

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2020-11-03 21:30:47 +08:00 committed by David Sterba
parent 2f4d60dfae
commit a26663e7a2
1 changed files with 3 additions and 2 deletions
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5
fs/btrfs/disk-io.c
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@ -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]);