[PATCH for-next v7 2/5] null_blk: introduce badblocks_once parameter
From: Shin'ichiro Kawasaki <hidden>
Date: 2025-02-26 10:06:18
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
When IO errors happen on real storage devices, the IOs repeated to the same target range can success by virtue of recovery features by devices, such as reserved block assignment. To simulate such IO errors and recoveries, introduce the new parameter badblocks_once parameter. When this parameter is set to 1, the specified badblocks are cleared after the first IO error, so that the next IO to the blocks succeed. Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Reviewed-by: Johannes Thumshirn <redacted> Signed-off-by: Shin'ichiro Kawasaki <redacted> --- drivers/block/null_blk/main.c | 11 ++++++++--- drivers/block/null_blk/null_blk.h | 1 + 2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index 0725d221cff4..2a060a6ea8c0 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c@@ -473,6 +473,7 @@ NULLB_DEVICE_ATTR(shared_tags, bool, NULL); NULLB_DEVICE_ATTR(shared_tag_bitmap, bool, NULL); NULLB_DEVICE_ATTR(fua, bool, NULL); NULLB_DEVICE_ATTR(rotational, bool, NULL); +NULLB_DEVICE_ATTR(badblocks_once, bool, NULL); static ssize_t nullb_device_power_show(struct config_item *item, char *page) {
@@ -593,6 +594,7 @@ CONFIGFS_ATTR_WO(nullb_device_, zone_offline); static struct configfs_attribute *nullb_device_attrs[] = { &nullb_device_attr_badblocks, + &nullb_device_attr_badblocks_once, &nullb_device_attr_blocking, &nullb_device_attr_blocksize, &nullb_device_attr_cache_size,
@@ -1315,10 +1317,13 @@ static inline blk_status_t null_handle_badblocks(struct nullb_cmd *cmd, sector_t first_bad; int bad_sectors; - if (badblocks_check(bb, sector, nr_sectors, &first_bad, &bad_sectors)) - return BLK_STS_IOERR; + if (!badblocks_check(bb, sector, nr_sectors, &first_bad, &bad_sectors)) + return BLK_STS_OK; - return BLK_STS_OK; + if (cmd->nq->dev->badblocks_once) + badblocks_clear(bb, first_bad, bad_sectors); + + return BLK_STS_IOERR; } static inline blk_status_t null_handle_memory_backed(struct nullb_cmd *cmd,
diff --git a/drivers/block/null_blk/null_blk.h b/drivers/block/null_blk/null_blk.h
index 6f9fe6171087..3c4c07f0418b 100644
--- a/drivers/block/null_blk/null_blk.h
+++ b/drivers/block/null_blk/null_blk.h@@ -63,6 +63,7 @@ struct nullb_device { unsigned long flags; /* device flags */ unsigned int curr_cache; struct badblocks badblocks; + bool badblocks_once; unsigned int nr_zones; unsigned int nr_zones_imp_open;
--
2.47.0