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btrfs: use crypto_shash_digest() instead of open coding

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Use crypto_shash_digest() instead of crypto_shash_init() +
crypto_shash_update() + crypto_shash_final().  This is more efficient.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Eric Biggers
2020-04-30 23:51:59 -07:00
committed by David Sterba
parent 1ed802c972
commit fd08001f17
4 changed files with 10 additions and 18 deletions
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4
fs/btrfs/inode.c
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@@ -2742,9 +2742,7 @@ static int check_data_csum(struct inode *inode, struct btrfs_io_bio *io_bio,
kaddr = kmap_atomic(page);
shash->tfm = fs_info->csum_shash;
crypto_shash_init(shash);
crypto_shash_update(shash, kaddr + pgoff, len);
crypto_shash_final(shash, csum);
crypto_shash_digest(shash, kaddr + pgoff, len, csum);
if (memcmp(csum, csum_expected, csum_size))
goto zeroit;