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block: Replace zone_wlock debugfs entry with zone_wplugs entry

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In preparation to completely remove zone write locking, replace the
"zone_wlock" mq-debugfs entry that was listing zones that are
write-locked with the zone_wplugs entry which lists the zones that
currently have a write plug allocated.

The write plug information provided is: the zone number, the zone write
plug flags, the zone write plug write pointer offset and the number of
BIOs currently waiting for execution in the zone write plug BIO list.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Tested-by: Hans Holmberg <hans.holmberg@wdc.com>
Tested-by: Dennis Maisenbacher <dennis.maisenbacher@wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240408014128.205141-26-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Damien Le Moal 2024-04-08 10:41:25 +09:00 committed by Jens Axboe
parent d9f1439a30
commit a98b05b02f
3 changed files with 27 additions and 10 deletions
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2
block/blk-mq-debugfs.c
View file

@ -160,7 +160,7 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
{ "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops },
{ "pm_only", 0600, queue_pm_only_show, NULL },
{ "state", 0600, queue_state_show, queue_state_write },
{ "zone_wlock", 0400, queue_zone_wlock_show, NULL },
{ "zone_wplugs", 0400, queue_zone_wplugs_show, NULL },
{ },
};

4
block/blk-mq-debugfs.h
View file

@ -84,9 +84,9 @@ static inline void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
#endif
#if defined(CONFIG_BLK_DEV_ZONED) && defined(CONFIG_BLK_DEBUG_FS)
int queue_zone_wlock_show(void *data, struct seq_file *m);
int queue_zone_wplugs_show(void *data, struct seq_file *m);
#else
static inline int queue_zone_wlock_show(void *data, struct seq_file *m)
static inline int queue_zone_wplugs_show(void *data, struct seq_file *m)
{
return 0;
}

31
block/blk-zoned.c
View file

@ -1808,17 +1808,34 @@ EXPORT_SYMBOL_GPL(blk_revalidate_disk_zones);
#ifdef CONFIG_BLK_DEBUG_FS
int queue_zone_wlock_show(void *data, struct seq_file *m)
int queue_zone_wplugs_show(void *data, struct seq_file *m)
{
struct request_queue *q = data;
unsigned int i;
struct gendisk *disk = q->disk;
struct blk_zone_wplug *zwplug;
unsigned int zwp_wp_offset, zwp_flags;
unsigned int zwp_zone_no, zwp_ref;
unsigned int zwp_bio_list_size, i;
unsigned long flags;
if (!q->disk->seq_zones_wlock)
return 0;
rcu_read_lock();
for (i = 0; i < disk_zone_wplugs_hash_size(disk); i++) {
hlist_for_each_entry_rcu(zwplug,
&disk->zone_wplugs_hash[i], node) {
spin_lock_irqsave(&zwplug->lock, flags);
zwp_zone_no = zwplug->zone_no;
zwp_flags = zwplug->flags;
zwp_ref = atomic_read(&zwplug->ref);
zwp_wp_offset = zwplug->wp_offset;
zwp_bio_list_size = bio_list_size(&zwplug->bio_list);
spin_unlock_irqrestore(&zwplug->lock, flags);
for (i = 0; i < q->disk->nr_zones; i++)
if (test_bit(i, q->disk->seq_zones_wlock))
seq_printf(m, "%u\n", i);
seq_printf(m, "%u 0x%x %u %u %u\n",
zwp_zone_no, zwp_flags, zwp_ref,
zwp_wp_offset, zwp_bio_list_size);
}
}
rcu_read_unlock();
return 0;
}