From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from leontynka.twibright.com (leontynka.twibright.com [109.81.181.203]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F409034F46F; Tue, 26 Aug 2025 14:21:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=109.81.181.203 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756218109; cv=none; b=i6ggLI3CnTJvPkJkPH7+Paq4lCSooA/3iehGthiBjpUQGaLJP850W23mYYifk/t0PJpBQov7sqtyNDSdupg/0F1virRTT5A2vRN5ntIMnVyX+X6aLnd6O+QRs8FxEvoMvGhI8Ld8LzWQ0r7/2z31VheHwgTX/zGTD2vPb//jci4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756218109; c=relaxed/simple; bh=8ul5Q8Jg9G8zT+8Lv4JBfXa5L0K8sfBsqMWdFr3Zb3w=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=Ur8+4k+ZhunnS8weXKMmbFIX5SObuKVhafRyox/zNj9CwFzuZKwugwLlmqTqpTJCbzMsXlrG4iwKUHWA2pWRATB3zxK+FHY5aZpIMTrwifNTtjEKEhoZZwWurAnZYQBY+I5N+d9WnEivDKTdxgtZuxaNhrDh6sYM0Vc8wiuUqMU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=redhat.com; spf=fail smtp.mailfrom=redhat.com; arc=none smtp.client-ip=109.81.181.203 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=redhat.com Received: from zen ([192.168.128.17] helo=debian.vm) by leontynka.twibright.com with smtp (Exim 4.96) (envelope-from ) id 1uqu9O-008VrR-1E; Tue, 26 Aug 2025 15:55:51 +0200 Received: by debian.vm (sSMTP sendmail emulation); Tue, 26 Aug 2025 15:55:49 +0200 Message-ID: <20250826135549.891323214@debian4.vm> User-Agent: quilt/0.68 Date: Tue, 26 Aug 2025 15:54:54 +0200 From: Mikulas Patocka To: Harald Freudenberger Cc: Herbert Xu , "David S. Miller" , Eric Biggers , dengler@linux.ibm.com, linux-s390@vger.kernel.org, dm-devel@lists.linux.dev, ifranzki@linux.ibm.com, agk@redhat.com, snitzer@kernel.org, gmazyland@gmail.com, Mikulas Patocka Subject: [PATCH 1/7] dm-integrity: use internal variable for digestsize References: <20250826135453.012446010@debian4.vm> Precedence: bulk X-Mailing-List: dm-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Instead of calling digestsize() each time the digestsize for the internal hash is needed, store the digestsize in a new field internal_hash_digestsize within struct dm_integrity_c once and use this value when needed. Signed-off-by: Harald Freudenberger Signed-off-by: Mikulas Patocka --- drivers/md/dm-integrity.c | 25 ++++++++++++++----------- 1 file changed, 14 insertions(+), 11 deletions(-) Index: linux-2.6/drivers/md/dm-integrity.c =================================================================== --- linux-2.6.orig/drivers/md/dm-integrity.c 2025-08-15 17:31:52.000000000 +0200 +++ linux-2.6/drivers/md/dm-integrity.c 2025-08-15 17:33:14.000000000 +0200 @@ -223,6 +223,7 @@ struct dm_integrity_c { int failed; struct crypto_shash *internal_hash; + unsigned int internal_hash_digestsize; struct dm_target *ti; @@ -1676,7 +1677,7 @@ static void integrity_sector_checksum(st goto failed; } - digest_size = crypto_shash_digestsize(ic->internal_hash); + digest_size = ic->internal_hash_digestsize; if (unlikely(digest_size < ic->tag_size)) memset(result + digest_size, 0, ic->tag_size - digest_size); @@ -1776,7 +1777,7 @@ static void integrity_metadata(struct wo if (ic->internal_hash) { struct bvec_iter iter; struct bio_vec bv; - unsigned int digest_size = crypto_shash_digestsize(ic->internal_hash); + unsigned int digest_size = ic->internal_hash_digestsize; struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io)); char *checksums; unsigned int extra_space = unlikely(digest_size > ic->tag_size) ? digest_size - ic->tag_size : 0; @@ -2124,7 +2125,7 @@ retry_kmap: } while (++s < ic->sectors_per_block); if (ic->internal_hash) { - unsigned int digest_size = crypto_shash_digestsize(ic->internal_hash); + unsigned int digest_size = ic->internal_hash_digestsize; if (unlikely(digest_size > ic->tag_size)) { char checksums_onstack[HASH_MAX_DIGESTSIZE]; @@ -2428,7 +2429,7 @@ retry: if (!dio->integrity_payload) { unsigned digest_size, extra_size; dio->payload_len = ic->tuple_size * (bio_sectors(bio) >> ic->sb->log2_sectors_per_block); - digest_size = crypto_shash_digestsize(ic->internal_hash); + digest_size = ic->internal_hash_digestsize; extra_size = unlikely(digest_size > ic->tag_size) ? digest_size - ic->tag_size : 0; dio->payload_len += extra_size; dio->integrity_payload = kmalloc(dio->payload_len, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN); @@ -2589,7 +2590,7 @@ static void dm_integrity_inline_recheck( bio_put(outgoing_bio); integrity_sector_checksum(ic, dio->bio_details.bi_iter.bi_sector, outgoing_data, digest); - if (unlikely(crypto_memneq(digest, dio->integrity_payload, min(crypto_shash_digestsize(ic->internal_hash), ic->tag_size)))) { + if (unlikely(crypto_memneq(digest, dio->integrity_payload, min(ic->internal_hash_digestsize, ic->tag_size)))) { DMERR_LIMIT("%pg: Checksum failed at sector 0x%llx", ic->dev->bdev, dio->bio_details.bi_iter.bi_sector); atomic64_inc(&ic->number_of_mismatches); @@ -2629,7 +2630,7 @@ static int dm_integrity_end_io(struct dm //memset(mem, 0xff, ic->sectors_per_block << SECTOR_SHIFT); integrity_sector_checksum(ic, dio->bio_details.bi_iter.bi_sector, mem, digest); if (unlikely(crypto_memneq(digest, dio->integrity_payload + pos, - min(crypto_shash_digestsize(ic->internal_hash), ic->tag_size)))) { + min(ic->internal_hash_digestsize, ic->tag_size)))) { kunmap_local(mem); dm_integrity_free_payload(dio); INIT_WORK(&dio->work, dm_integrity_inline_recheck); @@ -3011,8 +3012,8 @@ oom: goto free_ret; } recalc_tags_size = (recalc_sectors >> ic->sb->log2_sectors_per_block) * ic->tag_size; - if (crypto_shash_digestsize(ic->internal_hash) > ic->tag_size) - recalc_tags_size += crypto_shash_digestsize(ic->internal_hash) - ic->tag_size; + if (ic->internal_hash_digestsize > ic->tag_size) + recalc_tags_size += ic->internal_hash_digestsize - ic->tag_size; recalc_tags = kvmalloc(recalc_tags_size, GFP_NOIO); if (!recalc_tags) { vfree(recalc_buffer); @@ -3171,8 +3172,8 @@ oom: } recalc_tags_size = (recalc_sectors >> ic->sb->log2_sectors_per_block) * ic->tuple_size; - if (crypto_shash_digestsize(ic->internal_hash) > ic->tuple_size) - recalc_tags_size += crypto_shash_digestsize(ic->internal_hash) - ic->tuple_size; + if (ic->internal_hash_digestsize > ic->tuple_size) + recalc_tags_size += ic->internal_hash_digestsize - ic->tuple_size; recalc_tags = kmalloc(recalc_tags_size, GFP_NOIO | __GFP_NOWARN); if (!recalc_tags) { kfree(recalc_buffer); @@ -4694,6 +4695,8 @@ static int dm_integrity_ctr(struct dm_ta "Invalid internal hash", "Error setting internal hash key"); if (r) goto bad; + if (ic->internal_hash) + ic->internal_hash_digestsize = crypto_shash_digestsize(ic->internal_hash); r = get_mac(&ic->journal_mac, &ic->journal_mac_alg, &ti->error, "Invalid journal mac", "Error setting journal mac key"); @@ -4706,7 +4709,7 @@ static int dm_integrity_ctr(struct dm_ta r = -EINVAL; goto bad; } - ic->tag_size = crypto_shash_digestsize(ic->internal_hash); + ic->tag_size = ic->internal_hash_digestsize; } if (ic->tag_size > MAX_TAG_SIZE) { ti->error = "Too big tag size";