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dm flakey: fix reads to be issued if drop_writes configured 

v4.8-rc3 commit 99f3c90d0d ("dm flakey: error READ bios during the
down_interval") overlooked the 'drop_writes' feature, which is meant to
allow reads to be issued rather than errored, during the down_interval.

Fixes: 99f3c90d0d ("dm flakey: error READ bios during the down_interval")
Reported-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Mike Snitzer 2016-08-24 21:12:58 -04:00
parent fa8410b355
commit 299f6230bc
1 changed files with 16 additions and 11 deletions
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27
drivers/md/dm-flakey.c
View File

@ -289,15 +289,13 @@ static int flakey_map(struct dm_target *ti, struct bio *bio)
pb->bio_submitted = true;
/*
* Map reads as normal only if corrupt_bio_byte set.
* Error reads if neither corrupt_bio_byte or drop_writes are set.
* Otherwise, flakey_end_io() will decide if the reads should be modified.
*/
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
if (!fc->corrupt_bio_byte && !test_bit(DROP_WRITES, &fc->flags))
return -EIO;
goto map_bio;
}
/*
@ -334,14 +332,21 @@ static int flakey_end_io(struct dm_target *ti, struct bio *bio, int error)
struct flakey_c *fc = ti->private;
struct per_bio_data *pb = dm_per_bio_data(bio, sizeof(struct per_bio_data));
/*
* Corrupt successful READs while in down state.
*/
if (!error && pb->bio_submitted && (bio_data_dir(bio) == READ)) {
if (fc->corrupt_bio_byte)
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);
else
} else if (!test_bit(DROP_WRITES, &fc->flags)) {
/*
* Error read during the down_interval if drop_writes
* wasn't configured.
*/
return -EIO;
}
}
return error;