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dm flakey: fix logic when corrupting a bio

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If "corrupt_bio_byte" is set to corrupt reads and corrupt_bio_flags is
used, dm-flakey would erroneously return all writes as errors. Likewise,
if "corrupt_bio_byte" is set to corrupt writes, dm-flakey would return
errors for all reads.

Fix the logic so that if fc->corrupt_bio_byte is non-zero, dm-flakey
will not abort reads on writes with an error.

Cc: stable@vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Mikulas Patocka 2023-01-22 14:03:56 -05:00 committed by Mike Snitzer
parent 8eb29c4fbf
commit aa56b9b759
1 changed files with 13 additions and 10 deletions
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23
drivers/md/dm-flakey.c
View file

@ -365,9 +365,11 @@ static int flakey_map(struct dm_target *ti, struct bio *bio)
/*
* Corrupt matching writes.
*/
if (fc->corrupt_bio_byte && (fc->corrupt_bio_rw == WRITE)) {
if (all_corrupt_bio_flags_match(bio, fc))
corrupt_bio_data(bio, fc);
if (fc->corrupt_bio_byte) {
if (fc->corrupt_bio_rw == WRITE) {
if (all_corrupt_bio_flags_match(bio, fc))
corrupt_bio_data(bio, fc);
}
goto map_bio;
}
@ -393,13 +395,14 @@ static int flakey_end_io(struct dm_target *ti, struct bio *bio,
return DM_ENDIO_DONE;
if (!*error && pb->bio_submitted && (bio_data_dir(bio) == READ)) {
if (fc->corrupt_bio_byte && (fc->corrupt_bio_rw == READ) &&
all_corrupt_bio_flags_match(bio, fc)) {
/*
* Corrupt successful matching READs while in down state.
*/
corrupt_bio_data(bio, fc);
if (fc->corrupt_bio_byte) {
if ((fc->corrupt_bio_rw == READ) &&
all_corrupt_bio_flags_match(bio, fc)) {
/*
* Corrupt successful matching READs while in down state.
*/
corrupt_bio_data(bio, fc);
}
} else if (!test_bit(DROP_WRITES, &fc->flags) &&
!test_bit(ERROR_WRITES, &fc->flags)) {
/*