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null_blk: Add rotational feature support

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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>
This commit is contained in:
Damien Le Moal
2024-11-26 09:09:56 +09:00
committed by Jens Axboe
parent f6661b1d05
commit b56426bcf8
2 changed files with 13 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/block/null_blk/main.c
View File

@@ -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);

1
drivers/block/null_blk/null_blk.h
View File

@@ -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 {