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btrfs: scrub: simplify data block checksum calculation

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We have sectorsize same as PAGE_SIZE, the checksum can be calculated in
one go.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2020-05-29 15:54:41 +02:00
parent c746054109
commit 771aba0d12
1 changed files with 3 additions and 21 deletions
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24
fs/btrfs/scrub.c
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@ -1789,37 +1789,19 @@ static int scrub_checksum_data(struct scrub_block *sblock)
u8 *on_disk_csum;
struct page *page;
char *kaddr;
u64 len;
int index;
BUG_ON(sblock->page_count < 1);
if (!sblock->pagev[0]->have_csum)
return 0;
shash->tfm = fs_info->csum_shash;
crypto_shash_init(shash);
on_disk_csum = sblock->pagev[0]->csum;
page = sblock->pagev[0]->page;
kaddr = page_address(page);
len = sctx->fs_info->sectorsize;
index = 0;
for (;;) {
u64 l = min_t(u64, len, PAGE_SIZE);
shash->tfm = fs_info->csum_shash;
crypto_shash_init(shash);
crypto_shash_digest(shash, kaddr, PAGE_SIZE, csum);
crypto_shash_update(shash, kaddr, l);
len -= l;
if (len == 0)
break;
index++;
BUG_ON(index >= sblock->page_count);
BUG_ON(!sblock->pagev[index]->page);
page = sblock->pagev[index]->page;
kaddr = page_address(page);
}
crypto_shash_final(shash, csum);
if (memcmp(csum, on_disk_csum, sctx->csum_size))
sblock->checksum_error = 1;