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dm-integrity: use internal variable for digestsize

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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 <freude@linux.ibm.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
This commit is contained in:
Mikulas Patocka
2025-09-17 17:47:24 +02:00
parent 9ddf6d3fcb
commit e4cc9deca3
1 changed files with 14 additions and 11 deletions
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25
drivers/md/dm-integrity.c
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@@ -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(struct dm_integrity_c *ic, sector_t sector
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 work_struct *w)
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 @@ static bool __journal_read_write(struct dm_integrity_io *dio, struct bio *bio,
} 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 @@ static int dm_integrity_map_inline(struct dm_integrity_io *dio, bool from_map)
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(struct work_struct *w)
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_target *ti, struct bio *bio, blk_status
//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 @@ static void integrity_recalc(struct work_struct *w)
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 @@ static void integrity_recalc_inline(struct work_struct *w)
}
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_target *ti, unsigned int argc, char **argv
"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_target *ti, unsigned int argc, char **argv
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";