[PATCH] dm-verity: skip verity_handle_error on I/O errors

From: Akilesh Kailash
Date: Mon Sep 13 2021 - 05:27:30 EST


If there is an I/O error and FEC correction fails, return
an error instead of calling verity_handle_error().

Suggested-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
Signed-off-by: Akilesh Kailash <akailash@xxxxxxxxxx>
---
This was discussed in [1] by Sami Tolvanen but was
never implemented.

[1] https://lore.kernel.org/dm-devel/b004e7c7-f795-77ed-19b9-983785780e92@xxxxxxxxx/T/#mec4df1ba3f3cb63846875fb2bfc1f8b3100f31f1

drivers/md/dm-verity-target.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c
index 22a5ac82446a..a6f7c452ee80 100644
--- a/drivers/md/dm-verity-target.c
+++ b/drivers/md/dm-verity-target.c
@@ -475,6 +475,7 @@ static int verity_verify_io(struct dm_verity_io *io)
struct bvec_iter start;
unsigned b;
struct crypto_wait wait;
+ struct bio *bio = dm_bio_from_per_bio_data(io, v->ti->per_io_data_size);

for (b = 0; b < io->n_blocks; b++) {
int r;
@@ -529,9 +530,17 @@ static int verity_verify_io(struct dm_verity_io *io)
else if (verity_fec_decode(v, io, DM_VERITY_BLOCK_TYPE_DATA,
cur_block, NULL, &start) == 0)
continue;
- else if (verity_handle_err(v, DM_VERITY_BLOCK_TYPE_DATA,
+ 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))
- return -EIO;
+ return -EIO;
+ }
}

return 0;
--
2.33.0.309.g3052b89438-goog