From: Damien Le Moal <damien.lemoal@xxxxxxx>
If a target maps to a zoned block device, check that the device area is
aligned on zone boundaries to avoid problems with REQ_OP_ZONE_RESET
operations (resetting a partially mapped sequential zone would not be
possible). This also greatly facilitate the processing of zone report
with REQ_OP_ZONE_REPORT bios.
Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Reviewed-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
---
drivers/md/dm-table.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 6a7e200..3949897 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -340,6 +340,33 @@ static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev,
return 1;
}
+ /*
+ * If the target is mapped to a zoned block device, check
+ * that the device zones are not partially mapped.
+ */
+ if (bdev_zoned_model(bdev) != BLK_ZONED_NONE) {
+ unsigned int zone_sectors = bdev_zone_sectors(bdev);
+
+ if (start & (zone_sectors - 1)) {
+ DMWARN("%s: start=%llu not aligned to h/w "
+ "zone size %u of %s",
+ dm_device_name(ti->table->md),
+ (unsigned long long)start,
+ zone_sectors, bdevname(bdev, b));
+ return 1;
+ }
+
+ if (start + len < dev_size &&
+ len & (zone_sectors - 1)) {
+ DMWARN("%s: len=%llu not aligned to h/w "
+ "zone size %u of %s",
+ dm_device_name(ti->table->md),
+ (unsigned long long)start,
+ zone_sectors, bdevname(bdev, b));
+ return 1;
+ }
+ }
+
return 0;
}
--
2.9.3
--
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