From: Damien Le Moal <damien.lemoal@xxxxxxx>
With the development of file system support for zoned block devices
(e.g. f2fs), having dm-flakey support for these devices is interesting
to improve testing.
This patch adds support for zoned block devices in dm-flakey, both
host-aware and host-managed. The target type feature is set to
DM_TARGET_ZONED_HM indicate support for host-managed models. The
remaining of the support adds 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 also added.
Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxx>
---
drivers/md/dm-flakey.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index 13305a1..b419c85 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -251,6 +251,8 @@ static int flakey_ctr(struct dm_target *ti, unsigned int argc, char **argv)
return 0;
bad:
+ if (fc->dev)
+ dm_put_device(ti, fc->dev);
kfree(fc);
return r;
}
@@ -275,7 +277,7 @@ 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 +308,14 @@ 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) {
@@ -363,6 +373,14 @@ 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));
+ if (bio_op(bio) == REQ_OP_ZONE_RESET)
+ return error;
+
+ if (bio_op(bio) == REQ_OP_ZONE_REPORT) {
+ dm_remap_zone_report(ti, bio, fc->start);
+ return error;
+ }
+
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)) {
@@ -446,6 +464,7 @@ static int flakey_iterate_devices(struct dm_target *ti, iterate_devices_callout_
static struct target_type flakey_target = {
.name = "flakey",
.version = {1, 4, 0},
+ .features = DM_TARGET_ZONED_HM,
.module = THIS_MODULE,
.ctr = flakey_ctr,
.dtr = flakey_dtr,
--
2.9.3
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