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dm-verity: move data hash mismatch handling into its own function

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Move the code that handles mismatches of data block hashes into its own
function so that it doesn't clutter up verity_verify_io().

Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
This commit is contained in:
Eric Biggers 2024-07-02 16:38:21 +02:00 committed by Mikulas Patocka
parent 44d36a2ea4
commit e41e52e59e
1 changed files with 36 additions and 28 deletions
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64
drivers/md/dm-verity-target.c
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@ -542,6 +542,38 @@ free_ret:
return r; return r;
} }
static int verity_handle_data_hash_mismatch(struct dm_verity *v,
struct dm_verity_io *io,
struct bio *bio, sector_t blkno,
struct bvec_iter *start)
{
if (static_branch_unlikely(&use_bh_wq_enabled) && io->in_bh) {
/*
* Error handling code (FEC included) cannot be run in the
* BH workqueue, so fallback to a standard workqueue.
*/
return -EAGAIN;
}
if (verity_recheck(v, io, *start, blkno) == 0) {
if (v->validated_blocks)
set_bit(blkno, v->validated_blocks);
return 0;
}
#if defined(CONFIG_DM_VERITY_FEC)
if (verity_fec_decode(v, io, DM_VERITY_BLOCK_TYPE_DATA, blkno,
NULL, start) == 0)
return 0;
#endif
if (bio->bi_status)
return -EIO; /* Error correction failed; Just return error */
if (verity_handle_err(v, DM_VERITY_BLOCK_TYPE_DATA, blkno)) {
dm_audit_log_bio(DM_MSG_PREFIX, "verify-data", bio, blkno, 0);
return -EIO;
}
return 0;
}
static int verity_bv_zero(struct dm_verity *v, struct dm_verity_io *io, static int verity_bv_zero(struct dm_verity *v, struct dm_verity_io *io,
u8 *data, size_t len) u8 *data, size_t len)
{ {
@ -634,35 +666,11 @@ static int verity_verify_io(struct dm_verity_io *io)
if (v->validated_blocks) if (v->validated_blocks)
set_bit(cur_block, v->validated_blocks); set_bit(cur_block, v->validated_blocks);
continue; continue;
} else if (static_branch_unlikely(&use_bh_wq_enabled) && io->in_bh) {
/*
* Error handling code (FEC included) cannot be run in a
* tasklet since it may sleep, so fallback to work-queue.
*/
return -EAGAIN;
} else if (verity_recheck(v, io, start, cur_block) == 0) {
if (v->validated_blocks)
set_bit(cur_block, v->validated_blocks);
continue;
#if defined(CONFIG_DM_VERITY_FEC)
} else if (verity_fec_decode(v, io, DM_VERITY_BLOCK_TYPE_DATA,
cur_block, NULL, &start) == 0) {
continue;
#endif
} else {
if (bio->bi_status) {
/*
* Error correction failed; Just return error
*/
return -EIO;
}
if (verity_handle_err(v, DM_VERITY_BLOCK_TYPE_DATA,
cur_block)) {
dm_audit_log_bio(DM_MSG_PREFIX, "verify-data",
bio, cur_block, 0);
return -EIO;
}
} }
r = verity_handle_data_hash_mismatch(v, io, bio, cur_block,
&start);
if (unlikely(r))
return r;
} }
return 0; return 0;