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btrfs: scrub: simplify superblock checksum calculation
BTRFS_SUPER_INFO_SIZE is 4096, and fits to a page on all supported architectures, so we can calculate the checksum in one go. Signed-off-by: David Sterba <dsterba@suse.com>
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parent
b04852520e
commit
83cf6d5eae
1 changed files with 4 additions and 27 deletions
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@ -1907,15 +1907,8 @@ static int scrub_checksum_super(struct scrub_block *sblock)
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u8 on_disk_csum[BTRFS_CSUM_SIZE];
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struct page *page;
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char *kaddr;
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u64 mapped_size;
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void *p;
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int fail_gen = 0;
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int fail_cor = 0;
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u64 len;
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int index;
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shash->tfm = fs_info->csum_shash;
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crypto_shash_init(shash);
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BUG_ON(sblock->page_count < 1);
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page = sblock->pagev[0]->page;
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@ -1932,27 +1925,11 @@ static int scrub_checksum_super(struct scrub_block *sblock)
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if (!scrub_check_fsid(s->fsid, sblock->pagev[0]))
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++fail_cor;
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len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE;
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mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE;
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p = kaddr + BTRFS_CSUM_SIZE;
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index = 0;
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for (;;) {
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u64 l = min_t(u64, len, mapped_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 + BTRFS_CSUM_SIZE,
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BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE, calculated_csum);
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crypto_shash_update(shash, p, 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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mapped_size = PAGE_SIZE;
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p = kaddr;
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}
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crypto_shash_final(shash, calculated_csum);
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if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
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++fail_cor;
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