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btrfs: scrub: simplify data block checksum calculation
We have sectorsize same as PAGE_SIZE, the checksum can be calculated in one go. Signed-off-by: David Sterba <dsterba@suse.com>
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parent
c746054109
commit
771aba0d12
1 changed files with 3 additions and 21 deletions
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@ -1789,37 +1789,19 @@ static int scrub_checksum_data(struct scrub_block *sblock)
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u8 *on_disk_csum;
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struct page *page;
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char *kaddr;
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u64 len;
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int index;
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BUG_ON(sblock->page_count < 1);
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if (!sblock->pagev[0]->have_csum)
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return 0;
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shash->tfm = fs_info->csum_shash;
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crypto_shash_init(shash);
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on_disk_csum = sblock->pagev[0]->csum;
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page = sblock->pagev[0]->page;
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kaddr = page_address(page);
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len = sctx->fs_info->sectorsize;
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index = 0;
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for (;;) {
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u64 l = min_t(u64, len, PAGE_SIZE);
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shash->tfm = fs_info->csum_shash;
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crypto_shash_init(shash);
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crypto_shash_digest(shash, kaddr, PAGE_SIZE, csum);
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crypto_shash_update(shash, kaddr, l);
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len -= l;
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if (len == 0)
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break;
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index++;
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BUG_ON(index >= sblock->page_count);
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BUG_ON(!sblock->pagev[index]->page);
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page = sblock->pagev[index]->page;
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kaddr = page_address(page);
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}
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crypto_shash_final(shash, csum);
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if (memcmp(csum, on_disk_csum, sctx->csum_size))
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sblock->checksum_error = 1;
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