p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

dm verity: log the hash algorithm implementation 

Log the hash algorithm's driver name when a dm-verity target is created.
This will help people determine whether the expected implementation is
being used.  It can make an enormous difference; e.g., SHA-256 on ARM
can be 8x faster with the crypto extensions than without.  It can also
be useful to know if an implementation using an external crypto
accelerator is being used instead of a software implementation.

Example message:

[   35.281945] device-mapper: verity: sha256 using implementation "sha256-ce"

We've already found the similar message in fs/crypto/keyinfo.c to be
very useful.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Eric Biggers 2018-12-05 20:54:13 -08:00 committed by Mike Snitzer
parent af331ebae7
commit bbf6a56692
1 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/md/dm-verity-target.c
View File

@ -1040,6 +1040,15 @@ static int verity_ctr(struct dm_target *ti, unsigned argc, char **argv)
v->tfm = NULL;
goto bad;
}
/*
* dm-verity performance can vary greatly depending on which hash
* algorithm implementation is used. Help people debug performance
* problems by logging the ->cra_driver_name.
*/
DMINFO("%s using implementation \"%s\"", v->alg_name,
crypto_hash_alg_common(v->tfm)->base.cra_driver_name);
v->digest_size = crypto_ahash_digestsize(v->tfm);
if ((1 << v->hash_dev_block_bits) < v->digest_size * 2) {
ti->error = "Digest size too big";