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btrfs: scrub: remove temporary csum array in scrub_checksum_super
The page contents with the checksum is available during the entire function so we don't need to make a copy. Signed-off-by: David Sterba <dsterba@suse.com>
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1 changed files with 1 additions and 3 deletions
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@ -1904,7 +1904,6 @@ static int scrub_checksum_super(struct scrub_block *sblock)
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struct btrfs_fs_info *fs_info = sctx->fs_info;
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SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
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u8 calculated_csum[BTRFS_CSUM_SIZE];
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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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int fail_gen = 0;
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@ -1914,7 +1913,6 @@ static int scrub_checksum_super(struct scrub_block *sblock)
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page = sblock->pagev[0]->page;
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kaddr = page_address(page);
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s = (struct btrfs_super_block *)kaddr;
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memcpy(on_disk_csum, s->csum, sctx->csum_size);
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if (sblock->pagev[0]->logical != btrfs_super_bytenr(s))
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++fail_cor;
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@ -1930,7 +1928,7 @@ static int scrub_checksum_super(struct scrub_block *sblock)
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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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if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
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if (memcmp(calculated_csum, s->csum, sctx->csum_size))
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++fail_cor;
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if (fail_cor + fail_gen) {
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