null_blk: discard zones on reset
When memory backing is enabled, use null_handle_discard() to free the
backing memory used by a zone when the zone is being reset.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/drivers/block/null_blk.h b/drivers/block/null_blk.h
index 29a8817..63000ae 100644
--- a/drivers/block/null_blk.h
+++ b/drivers/block/null_blk.h
@@ -116,6 +116,8 @@ struct nullb {
char disk_name[DISK_NAME_LEN];
};
+blk_status_t null_handle_discard(struct nullb_device *dev, sector_t sector,
+ sector_t nr_sectors);
blk_status_t null_process_cmd(struct nullb_cmd *cmd,
enum req_opf op, sector_t sector,
unsigned int nr_sectors);
diff --git a/drivers/block/null_blk_main.c b/drivers/block/null_blk_main.c
index a223bee..b758b93 100644
--- a/drivers/block/null_blk_main.c
+++ b/drivers/block/null_blk_main.c
@@ -1076,8 +1076,8 @@ static void nullb_fill_pattern(struct nullb *nullb, struct page *page,
kunmap_atomic(dst);
}
-static blk_status_t null_handle_discard(struct nullb_device *dev,
- sector_t sector, sector_t nr_sectors)
+blk_status_t null_handle_discard(struct nullb_device *dev,
+ sector_t sector, sector_t nr_sectors)
{
struct nullb *nullb = dev->nullb;
size_t n = nr_sectors << SECTOR_SHIFT;
diff --git a/drivers/block/null_blk_zoned.c b/drivers/block/null_blk_zoned.c
index 4dad874..65464f7 100644
--- a/drivers/block/null_blk_zoned.c
+++ b/drivers/block/null_blk_zoned.c
@@ -588,6 +588,9 @@ static blk_status_t null_reset_zone(struct nullb_device *dev,
null_unlock_zone_res(dev);
+ if (dev->memory_backed)
+ return null_handle_discard(dev, zone->start, zone->len);
+
return BLK_STS_OK;
}
