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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>
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parent
771aba0d12
commit
d41ebef200
1 changed files with 5 additions and 7 deletions
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@ -1786,23 +1786,21 @@ static int scrub_checksum_data(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 csum[BTRFS_CSUM_SIZE];
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u8 *on_disk_csum;
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struct page *page;
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struct scrub_page *spage;
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char *kaddr;
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BUG_ON(sblock->page_count < 1);
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if (!sblock->pagev[0]->have_csum)
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spage = sblock->pagev[0];
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if (!spage->have_csum)
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return 0;
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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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kaddr = page_address(spage->page);
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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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if (memcmp(csum, on_disk_csum, sctx->csum_size))
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if (memcmp(csum, spage->csum, sctx->csum_size))
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sblock->checksum_error = 1;
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return sblock->checksum_error;
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