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block: return just one value from part_in_flight 

The previous patches deleted all the code that needed the second value
returned from part_in_flight - now the kernel only uses the first value.

Consequently, part_in_flight (and blk_mq_in_flight) may be changed so that
it only returns one value.

This patch just refactors the code, there's no functional change.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Mikulas Patocka 2018-12-06 11:41:21 -05:00 committed by Jens Axboe
parent 1226b8dd0e
commit e016b78201
5 changed files with 22 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
block/blk-mq.c
View File

@ -100,25 +100,23 @@ static bool blk_mq_check_inflight(struct blk_mq_hw_ctx *hctx,
struct mq_inflight *mi = priv;
/*
* index[0] counts the specific partition that was asked for. index[1]
* counts the ones that are active on the whole device, so increment
* that if mi->part is indeed a partition, and not a whole device.
* index[0] counts the specific partition that was asked for.
*/
if (rq->part == mi->part)
mi->inflight[0]++;
if (mi->part->partno)
mi->inflight[1]++;
return true;
}
void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part,
unsigned int inflight[2])
unsigned int blk_mq_in_flight(struct request_queue *q, struct hd_struct *part)
{
unsigned inflight[2];
struct mq_inflight mi = { .part = part, .inflight = inflight, };
inflight[0] = inflight[1] = 0;
blk_mq_queue_tag_busy_iter(q, blk_mq_check_inflight, &mi);
return inflight[0];
}
static bool blk_mq_check_inflight_rw(struct blk_mq_hw_ctx *hctx,

3
block/blk-mq.h
View File

@ -187,8 +187,7 @@ static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
return hctx->nr_ctx && hctx->tags;
}
void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part,
unsigned int inflight[2]);
unsigned int blk_mq_in_flight(struct request_queue *q, struct hd_struct *part);
void blk_mq_in_flight_rw(struct request_queue *q, struct hd_struct *part,
unsigned int inflight[2]);

34
block/genhd.c
View File

@ -65,34 +65,24 @@ void part_dec_in_flight(struct request_queue *q, struct hd_struct *part, int rw)
part_stat_local_dec(&part_to_disk(part)->part0, in_flight[rw]);
}
void part_in_flight(struct request_queue *q, struct hd_struct *part,
unsigned int inflight[2])
unsigned int part_in_flight(struct request_queue *q, struct hd_struct *part)
{
int cpu;
unsigned int inflight;
if (queue_is_mq(q)) {
blk_mq_in_flight(q, part, inflight);
return;
return blk_mq_in_flight(q, part);
}
inflight[0] = 0;
inflight = 0;
for_each_possible_cpu(cpu) {
inflight[0] += part_stat_local_read_cpu(part, in_flight[0], cpu) +
part_stat_local_read_cpu(part, in_flight[1], cpu);
inflight += part_stat_local_read_cpu(part, in_flight[0], cpu) +
part_stat_local_read_cpu(part, in_flight[1], cpu);
}
if ((int)inflight[0] < 0)
inflight[0] = 0;
if ((int)inflight < 0)
inflight = 0;
if (part->partno) {
part = &part_to_disk(part)->part0;
inflight[1] = 0;
for_each_possible_cpu(cpu) {
inflight[1] += part_stat_local_read_cpu(part, in_flight[0], cpu) +
part_stat_local_read_cpu(part, in_flight[1], cpu);
}
if ((int)inflight[1] < 0)
inflight[1] = 0;
}
return inflight;
}
void part_in_flight_rw(struct request_queue *q, struct hd_struct *part,
@ -1348,7 +1338,7 @@ static int diskstats_show(struct seq_file *seqf, void *v)
struct disk_part_iter piter;
struct hd_struct *hd;
char buf[BDEVNAME_SIZE];
unsigned int inflight[2];
unsigned int inflight;
/*
if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next)
@ -1360,7 +1350,7 @@ static int diskstats_show(struct seq_file *seqf, void *v)
disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0);
while ((hd = disk_part_iter_next(&piter))) {
part_in_flight(gp->queue, hd, inflight);
inflight = part_in_flight(gp->queue, hd);
seq_printf(seqf, "%4d %7d %s "
"%lu %lu %lu %u "
"%lu %lu %lu %u "
@ -1376,7 +1366,7 @@ static int diskstats_show(struct seq_file *seqf, void *v)
part_stat_read(hd, merges[STAT_WRITE]),
part_stat_read(hd, sectors[STAT_WRITE]),
(unsigned int)part_stat_read_msecs(hd, STAT_WRITE),
inflight[0],
inflight,
jiffies_to_msecs(part_stat_read(hd, io_ticks)),
jiffies_to_msecs(part_stat_read(hd, time_in_queue)),
part_stat_read(hd, ios[STAT_DISCARD]),

6
block/partition-generic.c
View File

@ -120,9 +120,9 @@ ssize_t part_stat_show(struct device *dev,
{
struct hd_struct *p = dev_to_part(dev);
struct request_queue *q = part_to_disk(p)->queue;
unsigned int inflight[2];
unsigned int inflight;
part_in_flight(q, p, inflight);
inflight = part_in_flight(q, p);
return sprintf(buf,
"%8lu %8lu %8llu %8u "
"%8lu %8lu %8llu %8u "
@ -137,7 +137,7 @@ ssize_t part_stat_show(struct device *dev,
part_stat_read(p, merges[STAT_WRITE]),
(unsigned long long)part_stat_read(p, sectors[STAT_WRITE]),
(unsigned int)part_stat_read_msecs(p, STAT_WRITE),
inflight[0],
inflight,
jiffies_to_msecs(part_stat_read(p, io_ticks)),
jiffies_to_msecs(part_stat_read(p, time_in_queue)),
part_stat_read(p, ios[STAT_DISCARD]),

3
include/linux/genhd.h
View File

@ -391,8 +391,7 @@ static inline void free_part_stats(struct hd_struct *part)
#define part_stat_local_read_cpu(gendiskp, field, cpu) \
local_read(&(part_stat_get_cpu(gendiskp, field, cpu)))
void part_in_flight(struct request_queue *q, struct hd_struct *part,
unsigned int inflight[2]);
unsigned int part_in_flight(struct request_queue *q, struct hd_struct *part);
void part_in_flight_rw(struct request_queue *q, struct hd_struct *part,
unsigned int inflight[2]);
void part_dec_in_flight(struct request_queue *q, struct hd_struct *part,