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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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13
fs/btrfs/disk-io.c
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@@ -358,16 +358,14 @@ static int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
shash->tfm = fs_info->csum_shash;
crypto_shash_init(shash);
/*
* The super_block structure does not span the whole
* BTRFS_SUPER_INFO_SIZE range, we expect that the unused space is
* filled with zeros and is included in the checksum.
*/
crypto_shash_update(shash, raw_disk_sb + BTRFS_CSUM_SIZE,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
crypto_shash_final(shash, result);
crypto_shash_digest(shash, raw_disk_sb + BTRFS_CSUM_SIZE,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE, result);
if (memcmp(disk_sb->csum, result, btrfs_super_csum_size(disk_sb)))
return 1;
@@ -3504,10 +3502,9 @@ static int write_dev_supers(struct btrfs_device *device,
btrfs_set_super_bytenr(sb, bytenr);
crypto_shash_init(shash);
crypto_shash_update(shash, (const char *)sb + BTRFS_CSUM_SIZE,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
crypto_shash_final(shash, sb->csum);
crypto_shash_digest(shash, (const char *)sb + BTRFS_CSUM_SIZE,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE,
sb->csum);
page = find_or_create_page(mapping, bytenr >> PAGE_SHIFT,
GFP_NOFS);