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BACKPORT: FROMLIST: 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>

Bug: 330611177
Link: https://lore.kernel.org/r/20240621165922.77672-9-ebiggers@kernel.org
(resolved conflict due to missing the upstream commit
 "dm-verity: Convert from tasklet to BH workqueue", which is hard to
 cherry-pick because it depends on workqueue subsystem changes)
Change-Id: I891196793e7a0fb136dbc339b520e553ea17869b
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers 2024-06-21 10:37:53 -07:00 committed by William McVicker
parent 76fed9f013
commit 7958bb4e87
1 changed files with 36 additions and 29 deletions
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65
drivers/md/dm-verity-target.c
View File

@ -543,6 +543,38 @@ free_ret:
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_tasklet_enabled) && io->in_tasklet) {
/*
* Error handling code (FEC included) cannot be run in a
* tasklet since it may sleep, so fallback to work-queue.
*/
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,
u8 *data, size_t len)
{
@ -635,36 +667,11 @@ static int verity_verify_io(struct dm_verity_io *io)
if (v->validated_blocks)
set_bit(cur_block, v->validated_blocks);
continue;
} else if (static_branch_unlikely(&use_tasklet_enabled) &&
io->in_tasklet) {
/*
* 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;