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dm flakey: error READ bios during the down_interval 

When the corrupt_bio_byte feature was introduced it caused READ bios to
no longer be errored with -EIO during the down_interval.  This had to do
with the complexity of needing to submit READs if the corrupt_bio_byte
feature was used.

Fix it so READ bios are properly errored with -EIO; doing so early in
flakey_map() as long as there isn't a match for the corrupt_bio_byte
feature.

Fixes: a3998799fb ("dm flakey: add corrupt_bio_byte feature")
Reported-by: Akira Hayakawa <ruby.wktk@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Mike Snitzer 2016-07-29 13:19:55 -04:00
parent f7b32e4c02
commit 99f3c90d0d
1 changed files with 15 additions and 8 deletions
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23
drivers/md/dm-flakey.c
View File

@ -289,10 +289,16 @@ static int flakey_map(struct dm_target *ti, struct bio *bio)
pb->bio_submitted = true;
/*
* Map reads as normal.
* Map reads as normal only if corrupt_bio_byte set.
*/
if (bio_data_dir(bio) == READ)
goto map_bio;
if (bio_data_dir(bio) == READ) {
/* If flags were specified, only corrupt those that match. */
if (fc->corrupt_bio_byte && (fc->corrupt_bio_rw == READ) &&
all_corrupt_bio_flags_match(bio, fc))
goto map_bio;
else
return -EIO;
}
/*
* Drop writes?
@ -330,12 +336,13 @@ static int flakey_end_io(struct dm_target *ti, struct bio *bio, int error)
/*
* Corrupt successful READs while in down state.
* If flags were specified, only corrupt those that match.
*/
if (fc->corrupt_bio_byte && !error && pb->bio_submitted &&
(bio_data_dir(bio) == READ) && (fc->corrupt_bio_rw == READ) &&
all_corrupt_bio_flags_match(bio, fc))
corrupt_bio_data(bio, fc);
if (!error && pb->bio_submitted && (bio_data_dir(bio) == READ)) {
if (fc->corrupt_bio_byte)
corrupt_bio_data(bio, fc);
else
return -EIO;
}
return error;
}