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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>
This commit is contained in:
David Sterba 2020-05-29 15:43:14 +02:00
parent 83cf6d5eae
commit 74710cf1fb
1 changed files with 1 additions and 3 deletions
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4
fs/btrfs/scrub.c
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@ -1904,7 +1904,6 @@ static int scrub_checksum_super(struct scrub_block *sblock)
struct btrfs_fs_info *fs_info = sctx->fs_info;
SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
u8 calculated_csum[BTRFS_CSUM_SIZE];
u8 on_disk_csum[BTRFS_CSUM_SIZE];
struct page *page;
char *kaddr;
int fail_gen = 0;
@ -1914,7 +1913,6 @@ static int scrub_checksum_super(struct scrub_block *sblock)
page = sblock->pagev[0]->page;
kaddr = page_address(page);
s = (struct btrfs_super_block *)kaddr;
memcpy(on_disk_csum, s->csum, sctx->csum_size);
if (sblock->pagev[0]->logical != btrfs_super_bytenr(s))
++fail_cor;
@ -1930,7 +1928,7 @@ static int scrub_checksum_super(struct scrub_block *sblock)
crypto_shash_digest(shash, kaddr + BTRFS_CSUM_SIZE,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE, calculated_csum);
if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
if (memcmp(calculated_csum, s->csum, sctx->csum_size))
++fail_cor;
if (fail_cor + fail_gen) {