diff options
| author | Damien Le Moal <dlemoal@kernel.org> | 2024-11-26 09:09:56 +0900 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2024-12-23 08:17:22 -0700 |
| commit | b56426bcf880d0f14a482c302ab7e37f3e6c3583 (patch) | |
| tree | 70f57d831d804c6164c9ee109157500b359c96fc | |
| parent | f6661b1d0525f3764596a1b65eeed9e75aecafa7 (diff) | |
null_blk: Add rotational feature support
To facilitate testing of kernel functions related to the rotational
feature (BLK_FEAT_ROTATIONAL) of a block device (e.g. NVMe rotational
bit support), add the rotational boolean configfs attribute and module
parameter to the null_blk driver. If set, a null block device will
report being a rotational device through it queue limits features with
the BLK_FEAT_ROTATIONAL flag.
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20241126000956.95983-1-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | drivers/block/null_blk/main.c | 13 | ||||
| -rw-r--r-- | drivers/block/null_blk/null_blk.h | 1 |
2 files changed, 13 insertions, 1 deletions
diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c index 3c3d8d200abb..32bd232cceef 100644 --- a/drivers/block/null_blk/main.c +++ b/drivers/block/null_blk/main.c @@ -266,6 +266,10 @@ static bool g_zone_full; module_param_named(zone_full, g_zone_full, bool, S_IRUGO); MODULE_PARM_DESC(zone_full, "Initialize the sequential write required zones of a zoned device to be full. Default: false"); +static bool g_rotational; +module_param_named(rotational, g_rotational, bool, S_IRUGO); +MODULE_PARM_DESC(rotational, "Set the rotational feature for the device. Default: false"); + static struct nullb_device *null_alloc_dev(void); static void null_free_dev(struct nullb_device *dev); static void null_del_dev(struct nullb *nullb); @@ -468,6 +472,7 @@ NULLB_DEVICE_ATTR(no_sched, bool, NULL); 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); static ssize_t nullb_device_power_show(struct config_item *item, char *page) { @@ -621,6 +626,7 @@ static struct configfs_attribute *nullb_device_attrs[] = { &nullb_device_attr_shared_tags, &nullb_device_attr_shared_tag_bitmap, &nullb_device_attr_fua, + &nullb_device_attr_rotational, NULL, }; @@ -706,7 +712,8 @@ static ssize_t memb_group_features_show(struct config_item *item, char *page) "shared_tags,size,submit_queues,use_per_node_hctx," "virt_boundary,zoned,zone_capacity,zone_max_active," "zone_max_open,zone_nr_conv,zone_offline,zone_readonly," - "zone_size,zone_append_max_sectors,zone_full\n"); + "zone_size,zone_append_max_sectors,zone_full," + "rotational\n"); } CONFIGFS_ATTR_RO(memb_group_, features); @@ -793,6 +800,7 @@ static struct nullb_device *null_alloc_dev(void) dev->shared_tags = g_shared_tags; dev->shared_tag_bitmap = g_shared_tag_bitmap; dev->fua = g_fua; + dev->rotational = g_rotational; return dev; } @@ -1938,6 +1946,9 @@ static int null_add_dev(struct nullb_device *dev) lim.features |= BLK_FEAT_FUA; } + if (dev->rotational) + lim.features |= BLK_FEAT_ROTATIONAL; + nullb->disk = blk_mq_alloc_disk(nullb->tag_set, &lim, nullb); if (IS_ERR(nullb->disk)) { rv = PTR_ERR(nullb->disk); diff --git a/drivers/block/null_blk/null_blk.h b/drivers/block/null_blk/null_blk.h index a7bb32f73ec3..6f9fe6171087 100644 --- a/drivers/block/null_blk/null_blk.h +++ b/drivers/block/null_blk/null_blk.h @@ -107,6 +107,7 @@ struct nullb_device { bool shared_tags; /* share tag set between devices for blk-mq */ bool shared_tag_bitmap; /* use hostwide shared tags */ bool fua; /* Support FUA */ + bool rotational; /* Fake rotational device */ }; struct nullb { |