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btrfs: scrub: clean up temporary page variables in scrub_checksum_data 

Add proper variable for the scrub page and use it instead of repeatedly
dereferencing the other structures.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2020-05-29 16:20:35 +02:00
parent 771aba0d12
commit d41ebef200
1 changed files with 5 additions and 7 deletions
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12
fs/btrfs/scrub.c
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@ -1786,23 +1786,21 @@ static int scrub_checksum_data(struct scrub_block *sblock)
struct btrfs_fs_info *fs_info = sctx->fs_info; struct btrfs_fs_info *fs_info = sctx->fs_info;
SHASH_DESC_ON_STACK(shash, fs_info->csum_shash); SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
u8 csum[BTRFS_CSUM_SIZE]; u8 csum[BTRFS_CSUM_SIZE];
u8 *on_disk_csum; struct scrub_page *spage;
struct page *page;
char *kaddr; char *kaddr;
BUG_ON(sblock->page_count < 1); BUG_ON(sblock->page_count < 1);
if (!sblock->pagev[0]->have_csum) spage = sblock->pagev[0];
if (!spage->have_csum)
return 0; return 0;
on_disk_csum = sblock->pagev[0]->csum; kaddr = page_address(spage->page);
page = sblock->pagev[0]->page;
kaddr = page_address(page);
shash->tfm = fs_info->csum_shash; shash->tfm = fs_info->csum_shash;
crypto_shash_init(shash); crypto_shash_init(shash);
crypto_shash_digest(shash, kaddr, PAGE_SIZE, csum); crypto_shash_digest(shash, kaddr, PAGE_SIZE, csum);
if (memcmp(csum, on_disk_csum, sctx->csum_size)) if (memcmp(csum, spage->csum, sctx->csum_size))
sblock->checksum_error = 1; sblock->checksum_error = 1;
return sblock->checksum_error; return sblock->checksum_error;