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block: Expose queue nr_zones in sysfs 

Expose through sysfs the nr_zones field of struct request_queue.
Exposing this value helps in debugging disk issues as well as
facilitating scripts based use of the disk (e.g. blktests).

For zoned block devices, the nr_zones field indicates the total number
of zones of the device calculated using the known disk capacity and
zone size. This number of zones is always 0 for regular block devices.

Since nr_zones is defined conditionally with CONFIG_BLK_DEV_ZONED,
introduce the blk_queue_nr_zones() function to return the correct value
for any device, regardless if CONFIG_BLK_DEV_ZONED is set.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Damien Le Moal 2018-10-12 19:08:48 +09:00 committed by Jens Axboe
parent a2d6b3a2d3
commit 965b652e90
2 changed files with 21 additions and 0 deletions
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11
block/blk-sysfs.c
View File

@ -300,6 +300,11 @@ static ssize_t queue_zoned_show(struct request_queue *q, char *page)
}
}
static ssize_t queue_nr_zones_show(struct request_queue *q, char *page)
{
return queue_var_show(blk_queue_nr_zones(q), page);
}
static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
{
return queue_var_show((blk_queue_nomerges(q) << 1) |
@ -637,6 +642,11 @@ static struct queue_sysfs_entry queue_zoned_entry = {
.show = queue_zoned_show,
};
static struct queue_sysfs_entry queue_nr_zones_entry = {
.attr = {.name = "nr_zones", .mode = 0444 },
.show = queue_nr_zones_show,
};
static struct queue_sysfs_entry queue_nomerges_entry = {
.attr = {.name = "nomerges", .mode = 0644 },
.show = queue_nomerges_show,
@ -727,6 +737,7 @@ static struct attribute *default_attrs[] = {
&queue_write_zeroes_max_entry.attr,
&queue_nonrot_entry.attr,
&queue_zoned_entry.attr,
&queue_nr_zones_entry.attr,
&queue_nomerges_entry.attr,
&queue_rq_affinity_entry.attr,
&queue_iostats_entry.attr,

10
include/linux/blkdev.h
View File

@ -811,6 +811,11 @@ static inline unsigned int blk_queue_zone_sectors(struct request_queue *q)
}
#ifdef CONFIG_BLK_DEV_ZONED
static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
{
return blk_queue_is_zoned(q) ? q->nr_zones : 0;
}
static inline unsigned int blk_queue_zone_no(struct request_queue *q,
sector_t sector)
{
@ -826,6 +831,11 @@ static inline bool blk_queue_zone_is_seq(struct request_queue *q,
return false;
return test_bit(blk_queue_zone_no(q, sector), q->seq_zones_bitmap);
}
#else /* CONFIG_BLK_DEV_ZONED */
static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
{
return 0;
}
#endif /* CONFIG_BLK_DEV_ZONED */
static inline bool rq_is_sync(struct request *rq)