[PATCH v4 7/9] null_blk: discard zones on reset
From: Damien Le Moal <hidden>
Date: 2020-11-20 01:55:48
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
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 <redacted> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <redacted> --- drivers/block/null_blk.h | 2 ++ drivers/block/null_blk_main.c | 4 ++-- drivers/block/null_blk_zoned.c | 3 +++ 3 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/block/null_blk.h b/drivers/block/null_blk.h
index 29a8817fadfc..63000aeeb2f3 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 a223bee24e76..b758b9366630 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 4dad8748a61d..65464f7559e0 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; }
--
2.28.0