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null_blk: Enable modifying 'submit_queues' after an instance has been configured

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This patch makes it possible to test blk_mq_update_nr_hw_queues() from
inside a VM.

Cc: Christoph Hellwig <hch@infradead.org>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche 2019-09-30 16:00:47 -07:00 committed by Jens Axboe
parent e29158b4ff
commit 45919fbfe1
1 changed files with 50 additions and 25 deletions
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75
drivers/block/null_blk_main.c
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@ -227,7 +227,7 @@ static ssize_t nullb_device_uint_attr_store(unsigned int *val,
int result;
result = kstrtouint(page, 0, &tmp);
if (result)
if (result < 0)
return result;
*val = tmp;
@ -241,7 +241,7 @@ static ssize_t nullb_device_ulong_attr_store(unsigned long *val,
unsigned long tmp;
result = kstrtoul(page, 0, &tmp);
if (result)
if (result < 0)
return result;
*val = tmp;
@ -255,7 +255,7 @@ static ssize_t nullb_device_bool_attr_store(bool *val, const char *page,
int result;
result = kstrtobool(page, &tmp);
if (result)
if (result < 0)
return result;
*val = tmp;
@ -263,7 +263,7 @@ static ssize_t nullb_device_bool_attr_store(bool *val, const char *page,
}
/* The following macro should only be used with TYPE = {uint, ulong, bool}. */
#define NULLB_DEVICE_ATTR(NAME, TYPE) \
#define NULLB_DEVICE_ATTR(NAME, TYPE, APPLY) \
static ssize_t \
nullb_device_##NAME##_show(struct config_item *item, char *page) \
{ \
@ -274,32 +274,57 @@ static ssize_t \
nullb_device_##NAME##_store(struct config_item *item, const char *page, \
size_t count) \
{ \
int (*apply_fn)(struct nullb_device *dev, TYPE new_value) = APPLY; \
struct nullb_device *dev = to_nullb_device(item); \
TYPE new_value; \
int ret; \
\
if (test_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags)) \
return -EBUSY; \
return nullb_device_##TYPE##_attr_store(&dev->NAME, page, count); \
ret = nullb_device_##TYPE##_attr_store(&new_value, page, count); \
if (ret < 0) \
return ret; \
if (apply_fn) \
ret = apply_fn(dev, new_value); \
else if (test_bit(NULLB_DEV_FL_CONFIGURED, &dev->flags)) \
ret = -EBUSY; \
if (ret < 0) \
return ret; \
dev->NAME = new_value; \
return count; \
} \
CONFIGFS_ATTR(nullb_device_, NAME);
NULLB_DEVICE_ATTR(size, ulong);
NULLB_DEVICE_ATTR(completion_nsec, ulong);
NULLB_DEVICE_ATTR(submit_queues, uint);
NULLB_DEVICE_ATTR(home_node, uint);
NULLB_DEVICE_ATTR(queue_mode, uint);
NULLB_DEVICE_ATTR(blocksize, uint);
NULLB_DEVICE_ATTR(irqmode, uint);
NULLB_DEVICE_ATTR(hw_queue_depth, uint);
NULLB_DEVICE_ATTR(index, uint);
NULLB_DEVICE_ATTR(blocking, bool);
NULLB_DEVICE_ATTR(use_per_node_hctx, bool);
NULLB_DEVICE_ATTR(memory_backed, bool);
NULLB_DEVICE_ATTR(discard, bool);
NULLB_DEVICE_ATTR(mbps, uint);
NULLB_DEVICE_ATTR(cache_size, ulong);
NULLB_DEVICE_ATTR(zoned, bool);
NULLB_DEVICE_ATTR(zone_size, ulong);
NULLB_DEVICE_ATTR(zone_nr_conv, uint);
static int nullb_apply_submit_queues(struct nullb_device *dev,
unsigned int submit_queues)
{
struct nullb *nullb = dev->nullb;
struct blk_mq_tag_set *set;
if (!nullb)
return 0;
set = nullb->tag_set;
blk_mq_update_nr_hw_queues(set, submit_queues);
return set->nr_hw_queues == submit_queues ? 0 : -ENOMEM;
}
NULLB_DEVICE_ATTR(size, ulong, NULL);
NULLB_DEVICE_ATTR(completion_nsec, ulong, NULL);
NULLB_DEVICE_ATTR(submit_queues, uint, nullb_apply_submit_queues);
NULLB_DEVICE_ATTR(home_node, uint, NULL);
NULLB_DEVICE_ATTR(queue_mode, uint, NULL);
NULLB_DEVICE_ATTR(blocksize, uint, NULL);
NULLB_DEVICE_ATTR(irqmode, uint, NULL);
NULLB_DEVICE_ATTR(hw_queue_depth, uint, NULL);
NULLB_DEVICE_ATTR(index, uint, NULL);
NULLB_DEVICE_ATTR(blocking, bool, NULL);
NULLB_DEVICE_ATTR(use_per_node_hctx, bool, NULL);
NULLB_DEVICE_ATTR(memory_backed, bool, NULL);
NULLB_DEVICE_ATTR(discard, bool, NULL);
NULLB_DEVICE_ATTR(mbps, uint, NULL);
NULLB_DEVICE_ATTR(cache_size, ulong, NULL);
NULLB_DEVICE_ATTR(zoned, bool, NULL);
NULLB_DEVICE_ATTR(zone_size, ulong, NULL);
NULLB_DEVICE_ATTR(zone_nr_conv, uint, NULL);
static ssize_t nullb_device_power_show(struct config_item *item, char *page)
{