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authorMike Snitzer <snitzer@redhat.com>2016-07-29 13:19:55 -0400
committerMike Snitzer <snitzer@redhat.com>2016-08-02 16:08:59 -0400
commit99f3c90d0d85708e7401a81ce3314e50bf7f2819 (patch)
tree97e77eb78fa2f23e30a3279caed0c08af77bdf90 /drivers/md
parentf7b32e4c021fd788f13f6785e17efbc3eb05b351 (diff)
downloadlinux-99f3c90d0d85708e7401a81ce3314e50bf7f2819.tar.bz2
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: a3998799fb4df ("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
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-flakey.c23
1 files changed, 15 insertions, 8 deletions
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index 29b99fb6a16a..19db13e99466 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -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;
}