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dm flakey: add support for zoned block devices 

With the development of file system support for zoned block devices
(e.g. f2fs), having dm-flakey support these devices is interesting
to improve testing.

Add host-aware and host-managed zoned block devices support to in
dm-flakey.  The target type feature is set to DM_TARGET_ZONED_HM to
indicate support for host-managed models.  Also add hooks for remapping
of REQ_OP_ZONE_RESET and REQ_OP_ZONE_REPORT bios.  Additionally, in the
bio completion path, (backward) remapping of a zone report reply is
added.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
zero-colors
Damien Le Moal 2017-05-08 16:40:49 -07:00 committed by Mike Snitzer
parent 10999307c1
commit 124c44546d
1 changed files with 20 additions and 3 deletions
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23
drivers/md/dm-flakey.c
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@ -275,7 +275,7 @@ static void flakey_map_bio(struct dm_target *ti, struct bio *bio)
struct flakey_c *fc = ti->private;
bio->bi_bdev = fc->dev->bdev;
if (bio_sectors(bio))
if (bio_sectors(bio) || bio_op(bio) == REQ_OP_ZONE_RESET)
bio->bi_iter.bi_sector =
flakey_map_sector(ti, bio->bi_iter.bi_sector);
}
@ -306,6 +306,14 @@ static int flakey_map(struct dm_target *ti, struct bio *bio)
struct per_bio_data *pb = dm_per_bio_data(bio, sizeof(struct per_bio_data));
pb->bio_submitted = false;
/* Do not fail reset zone */
if (bio_op(bio) == REQ_OP_ZONE_RESET)
goto map_bio;
/* We need to remap reported zones, so remember the BIO iter */
if (bio_op(bio) == REQ_OP_ZONE_REPORT)
goto map_bio;
/* Are we alive ? */
elapsed = (jiffies - fc->start_time) / HZ;
if (elapsed % (fc->up_interval + fc->down_interval) >= fc->up_interval) {
@ -359,11 +367,19 @@ map_bio:
}
static int flakey_end_io(struct dm_target *ti, struct bio *bio,
blk_status_t *error)
blk_status_t *error)
{
struct flakey_c *fc = ti->private;
struct per_bio_data *pb = dm_per_bio_data(bio, sizeof(struct per_bio_data));
if (bio_op(bio) == REQ_OP_ZONE_RESET)
return DM_ENDIO_DONE;
if (bio_op(bio) == REQ_OP_ZONE_REPORT) {
dm_remap_zone_report(ti, bio, fc->start);
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)) {
@ -446,7 +462,8 @@ static int flakey_iterate_devices(struct dm_target *ti, iterate_devices_callout_
static struct target_type flakey_target = {
.name = "flakey",
.version = {1, 4, 0},
.version = {1, 5, 0},
.features = DM_TARGET_ZONED_HM,
.module = THIS_MODULE,
.ctr = flakey_ctr,
.dtr = flakey_dtr,