Commit 074a7aca authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe

block: move stats from disk to part0

Move stats related fields - stamp, in_flight, dkstats - from disk to
part0 and unify stat handling such that...

* part_stat_*() now updates part0 together if the specified partition
  is not part0.  ie. part_stat_*() are now essentially all_stat_*().

* {disk|all}_stat_*() are gone.

* part_round_stats() is updated similary.  It handles part0 stats
  automatically and disk_round_stats() is killed.

* part_{inc|dec}_in_fligh() is implemented which automatically updates
  part0 stats for parts other than part0.

* disk_map_sector_rcu() is updated to return part0 if no part matches.
  Combined with the above changes, this makes NULL special case
  handling in callers unnecessary.

* Separate stats show code paths for disk are collapsed into part
  stats show code paths.

* Rename disk_stat_lock/unlock() to part_stat_lock/unlock()

While at it, reposition stat handling macros a bit and add missing
parentheses around macro parameters.
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent eddb2e26
......@@ -61,21 +61,17 @@ static void drive_stat_acct(struct request *rq, int new_io)
if (!blk_fs_request(rq) || !rq->rq_disk)
return;
cpu = disk_stat_lock();
cpu = part_stat_lock();
part = disk_map_sector_rcu(rq->rq_disk, rq->sector);
if (!new_io)
all_stat_inc(cpu, rq->rq_disk, part, merges[rw], rq->sector);
part_stat_inc(cpu, part, merges[rw]);
else {
disk_round_stats(cpu, rq->rq_disk);
rq->rq_disk->in_flight++;
if (part) {
part_round_stats(cpu, part);
part->in_flight++;
}
part_inc_in_flight(part);
}
disk_stat_unlock();
part_stat_unlock();
}
void blk_queue_congestion_threshold(struct request_queue *q)
......@@ -983,8 +979,22 @@ static inline void add_request(struct request_queue *q, struct request *req)
__elv_add_request(q, req, ELEVATOR_INSERT_SORT, 0);
}
/*
* disk_round_stats() - Round off the performance stats on a struct
static void part_round_stats_single(int cpu, struct hd_struct *part,
unsigned long now)
{
if (now == part->stamp)
return;
if (part->in_flight) {
__part_stat_add(cpu, part, time_in_queue,
part->in_flight * (now - part->stamp));
__part_stat_add(cpu, part, io_ticks, (now - part->stamp));
}
part->stamp = now;
}
/**
* part_round_stats() - Round off the performance stats on a struct
* disk_stats.
*
* The average IO queue length and utilisation statistics are maintained
......@@ -998,36 +1008,15 @@ static inline void add_request(struct request_queue *q, struct request *req)
* /proc/diskstats. This accounts immediately for all queue usage up to
* the current jiffies and restarts the counters again.
*/
void disk_round_stats(int cpu, struct gendisk *disk)
{
unsigned long now = jiffies;
if (now == disk->stamp)
return;
if (disk->in_flight) {
disk_stat_add(cpu, disk, time_in_queue,
disk->in_flight * (now - disk->stamp));
disk_stat_add(cpu, disk, io_ticks, (now - disk->stamp));
}
disk->stamp = now;
}
EXPORT_SYMBOL_GPL(disk_round_stats);
void part_round_stats(int cpu, struct hd_struct *part)
{
unsigned long now = jiffies;
if (now == part->stamp)
return;
if (part->in_flight) {
part_stat_add(cpu, part, time_in_queue,
part->in_flight * (now - part->stamp));
part_stat_add(cpu, part, io_ticks, (now - part->stamp));
}
part->stamp = now;
if (part->partno)
part_round_stats_single(cpu, &part_to_disk(part)->part0, now);
part_round_stats_single(cpu, part, now);
}
EXPORT_SYMBOL_GPL(part_round_stats);
/*
* queue lock must be held
......@@ -1567,11 +1556,10 @@ static int __end_that_request_first(struct request *req, int error,
struct hd_struct *part;
int cpu;
cpu = disk_stat_lock();
cpu = part_stat_lock();
part = disk_map_sector_rcu(req->rq_disk, req->sector);
all_stat_add(cpu, req->rq_disk, part, sectors[rw],
nr_bytes >> 9, req->sector);
disk_stat_unlock();
part_stat_add(cpu, part, sectors[rw], nr_bytes >> 9);
part_stat_unlock();
}
total_bytes = bio_nbytes = 0;
......@@ -1758,19 +1746,15 @@ static void end_that_request_last(struct request *req, int error)
struct hd_struct *part;
int cpu;
cpu = disk_stat_lock();
cpu = part_stat_lock();
part = disk_map_sector_rcu(disk, req->sector);
all_stat_inc(cpu, disk, part, ios[rw], req->sector);
all_stat_add(cpu, disk, part, ticks[rw], duration, req->sector);
disk_round_stats(cpu, disk);
disk->in_flight--;
if (part) {
part_stat_inc(cpu, part, ios[rw]);
part_stat_add(cpu, part, ticks[rw], duration);
part_round_stats(cpu, part);
part->in_flight--;
}
part_dec_in_flight(part);
disk_stat_unlock();
part_stat_unlock();
}
if (req->end_io)
......
......@@ -390,17 +390,13 @@ static int attempt_merge(struct request_queue *q, struct request *req,
struct hd_struct *part;
int cpu;
cpu = disk_stat_lock();
cpu = part_stat_lock();
part = disk_map_sector_rcu(req->rq_disk, req->sector);
disk_round_stats(cpu, req->rq_disk);
req->rq_disk->in_flight--;
if (part) {
part_round_stats(cpu, part);
part->in_flight--;
}
part_dec_in_flight(part);
disk_stat_unlock();
part_stat_unlock();
}
req->ioprio = ioprio_best(req->ioprio, next->ioprio);
......
......@@ -176,7 +176,7 @@ EXPORT_SYMBOL_GPL(disk_part_iter_exit);
* while preemption is disabled.
*
* RETURNS:
* Found partition on success, NULL if there's no matching partition.
* Found partition on success, part0 is returned if no partition matches
*/
struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector)
{
......@@ -189,7 +189,7 @@ struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector)
sector < part->start_sect + part->nr_sects)
return part;
}
return NULL;
return &disk->part0;
}
EXPORT_SYMBOL_GPL(disk_map_sector_rcu);
......@@ -580,24 +580,24 @@ void __init printk_all_partitions(void)
* numbers in hex - the same format as the root=
* option takes.
*/
printk("%s %10llu %s",
bdevt_str(disk_devt(disk), devt_buf),
(unsigned long long)get_capacity(disk) >> 1,
disk_name(disk, 0, name_buf));
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
while ((part = disk_part_iter_next(&piter))) {
bool is_part0 = part == &disk->part0;
printk("%s%s %10llu %s", is_part0 ? "" : " ",
bdevt_str(part_devt(part), devt_buf),
(unsigned long long)part->nr_sects >> 1,
disk_name(disk, part->partno, name_buf));
if (is_part0) {
if (disk->driverfs_dev != NULL &&
disk->driverfs_dev->driver != NULL)
printk(" driver: %s\n",
disk->driverfs_dev->driver->name);
else
printk(" (driver?)\n");
/* now show the partitions */
disk_part_iter_init(&piter, disk, 0);
while ((part = disk_part_iter_next(&piter)))
printk(" %s %10llu %s\n",
bdevt_str(part_devt(part), devt_buf),
(unsigned long long)part->nr_sects >> 1,
disk_name(disk, part->partno, name_buf));
} else
printk("\n");
}
disk_part_iter_exit(&piter);
}
class_dev_iter_exit(&iter);
......@@ -674,12 +674,7 @@ static int show_partition(struct seq_file *seqf, void *v)
return 0;
/* show the full disk and all non-0 size partitions of it */
seq_printf(seqf, "%4d %7d %10llu %s\n",
MAJOR(disk_devt(sgp)), MINOR(disk_devt(sgp)),
(unsigned long long)get_capacity(sgp) >> 1,
disk_name(sgp, 0, buf));
disk_part_iter_init(&piter, sgp, 0);
disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0);
while ((part = disk_part_iter_next(&piter)))
seq_printf(seqf, "%4d %7d %10llu %s\n",
MAJOR(part_devt(part)), MINOR(part_devt(part)),
......@@ -768,40 +763,13 @@ static ssize_t disk_capability_show(struct device *dev,
return sprintf(buf, "%x\n", disk->flags);
}
static ssize_t disk_stat_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gendisk *disk = dev_to_disk(dev);
int cpu;
cpu = disk_stat_lock();
disk_round_stats(cpu, disk);
disk_stat_unlock();
return sprintf(buf,
"%8lu %8lu %8llu %8u "
"%8lu %8lu %8llu %8u "
"%8u %8u %8u"
"\n",
disk_stat_read(disk, ios[READ]),
disk_stat_read(disk, merges[READ]),
(unsigned long long)disk_stat_read(disk, sectors[READ]),
jiffies_to_msecs(disk_stat_read(disk, ticks[READ])),
disk_stat_read(disk, ios[WRITE]),
disk_stat_read(disk, merges[WRITE]),
(unsigned long long)disk_stat_read(disk, sectors[WRITE]),
jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])),
disk->in_flight,
jiffies_to_msecs(disk_stat_read(disk, io_ticks)),
jiffies_to_msecs(disk_stat_read(disk, time_in_queue)));
}
static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL);
static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL);
static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL);
static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL);
static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL);
static DEVICE_ATTR(stat, S_IRUGO, disk_stat_show, NULL);
static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
#ifdef CONFIG_FAIL_MAKE_REQUEST
static struct device_attribute dev_attr_fail =
__ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
......@@ -836,7 +804,7 @@ static void disk_release(struct device *dev)
kfree(disk->random);
kfree(disk->__part);
free_disk_stats(disk);
free_part_stats(&disk->part0);
kfree(disk);
}
struct class block_class = {
......@@ -873,28 +841,11 @@ static int diskstats_show(struct seq_file *seqf, void *v)
"\n\n");
*/
cpu = disk_stat_lock();
disk_round_stats(cpu, gp);
disk_stat_unlock();
seq_printf(seqf, "%4d %7d %s %lu %lu %llu %u %lu %lu %llu %u %u %u %u\n",
MAJOR(disk_devt(gp)), MINOR(disk_devt(gp)),
disk_name(gp, 0, buf),
disk_stat_read(gp, ios[0]), disk_stat_read(gp, merges[0]),
(unsigned long long)disk_stat_read(gp, sectors[0]),
jiffies_to_msecs(disk_stat_read(gp, ticks[0])),
disk_stat_read(gp, ios[1]), disk_stat_read(gp, merges[1]),
(unsigned long long)disk_stat_read(gp, sectors[1]),
jiffies_to_msecs(disk_stat_read(gp, ticks[1])),
gp->in_flight,
jiffies_to_msecs(disk_stat_read(gp, io_ticks)),
jiffies_to_msecs(disk_stat_read(gp, time_in_queue)));
/* now show all non-0 size partitions of it */
disk_part_iter_init(&piter, gp, 0);
disk_part_iter_init(&piter, gp, DISK_PITER_INCL_PART0);
while ((hd = disk_part_iter_next(&piter))) {
cpu = disk_stat_lock();
cpu = part_stat_lock();
part_round_stats(cpu, hd);
disk_stat_unlock();
part_stat_unlock();
seq_printf(seqf, "%4d %7d %s %lu %lu %llu "
"%u %lu %lu %llu %u %u %u %u\n",
MAJOR(part_devt(hd)), MINOR(part_devt(hd)),
......@@ -1000,7 +951,7 @@ struct gendisk *alloc_disk_ext_node(int minors, int ext_minors, int node_id)
int tot_minors = minors + ext_minors;
int size = tot_minors * sizeof(struct hd_struct *);
if (!init_disk_stats(disk)) {
if (!init_part_stats(&disk->part0)) {
kfree(disk);
return NULL;
}
......@@ -1008,7 +959,7 @@ struct gendisk *alloc_disk_ext_node(int minors, int ext_minors, int node_id)
disk->__part = kmalloc_node(size, GFP_KERNEL | __GFP_ZERO,
node_id);
if (!disk->__part) {
free_disk_stats(disk);
free_part_stats(&disk->part0);
kfree(disk);
return NULL;
}
......
......@@ -758,15 +758,15 @@ diskstats(struct gendisk *disk, struct bio *bio, ulong duration, sector_t sector
struct hd_struct *part;
int cpu;
cpu = disk_stat_lock();
cpu = part_stat_lock();
part = disk_map_sector_rcu(disk, sector);
all_stat_inc(cpu, disk, part, ios[rw], sector);
all_stat_add(cpu, disk, part, ticks[rw], duration, sector);
all_stat_add(cpu, disk, part, sectors[rw], n_sect, sector);
all_stat_add(cpu, disk, part, io_ticks, duration, sector);
part_stat_inc(cpu, part, ios[rw]);
part_stat_add(cpu, part, ticks[rw], duration);
part_stat_add(cpu, part, sectors[rw], n_sect);
part_stat_add(cpu, part, io_ticks, duration);
disk_stat_unlock();
part_stat_unlock();
}
void
......
......@@ -381,10 +381,10 @@ static void start_io_acct(struct dm_io *io)
io->start_time = jiffies;
cpu = disk_stat_lock();
disk_round_stats(cpu, dm_disk(md));
disk_stat_unlock();
dm_disk(md)->in_flight = atomic_inc_return(&md->pending);
cpu = part_stat_lock();
part_round_stats(cpu, &dm_disk(md)->part0);
part_stat_unlock();
dm_disk(md)->part0.in_flight = atomic_inc_return(&md->pending);
}
static int end_io_acct(struct dm_io *io)
......@@ -395,12 +395,13 @@ static int end_io_acct(struct dm_io *io)
int pending, cpu;
int rw = bio_data_dir(bio);
cpu = disk_stat_lock();
disk_round_stats(cpu, dm_disk(md));
disk_stat_add(cpu, dm_disk(md), ticks[rw], duration);
disk_stat_unlock();
cpu = part_stat_lock();
part_round_stats(cpu, &dm_disk(md)->part0);
part_stat_add(cpu, &dm_disk(md)->part0, ticks[rw], duration);
part_stat_unlock();
dm_disk(md)->in_flight = pending = atomic_dec_return(&md->pending);
dm_disk(md)->part0.in_flight = pending =
atomic_dec_return(&md->pending);
return !pending;
}
......@@ -899,10 +900,10 @@ static int dm_request(struct request_queue *q, struct bio *bio)
down_read(&md->io_lock);
cpu = disk_stat_lock();
disk_stat_inc(cpu, dm_disk(md), ios[rw]);
disk_stat_add(cpu, dm_disk(md), sectors[rw], bio_sectors(bio));
disk_stat_unlock();
cpu = part_stat_lock();
part_stat_inc(cpu, &dm_disk(md)->part0, ios[rw]);
part_stat_add(cpu, &dm_disk(md)->part0, sectors[rw], bio_sectors(bio));
part_stat_unlock();
/*
* If we're suspended we have to queue
......
......@@ -325,10 +325,11 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
return 0;
}
cpu = disk_stat_lock();
disk_stat_inc(cpu, mddev->gendisk, ios[rw]);
disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio));
disk_stat_unlock();
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
bio_sectors(bio));
part_stat_unlock();
tmp_dev = which_dev(mddev, bio->bi_sector);
block = bio->bi_sector >> 1;
......
......@@ -5546,8 +5546,8 @@ static int is_mddev_idle(mddev_t *mddev)
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev) {
struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
curr_events = disk_stat_read(disk, sectors[0]) +
disk_stat_read(disk, sectors[1]) -
curr_events = part_stat_read(&disk->part0, sectors[0]) +
part_stat_read(&disk->part0, sectors[1]) -
atomic_read(&disk->sync_io);
/* sync IO will cause sync_io to increase before the disk_stats
* as sync_io is counted when a request starts, and
......
......@@ -159,10 +159,11 @@ static int multipath_make_request (struct request_queue *q, struct bio * bio)
mp_bh->master_bio = bio;
mp_bh->mddev = mddev;
cpu = disk_stat_lock();
disk_stat_inc(cpu, mddev->gendisk, ios[rw]);
disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio));
disk_stat_unlock();
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
bio_sectors(bio));
part_stat_unlock();
mp_bh->path = multipath_map(conf);
if (mp_bh->path < 0) {
......
......@@ -406,10 +406,11 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio)
return 0;
}
cpu = disk_stat_lock();
disk_stat_inc(cpu, mddev->gendisk, ios[rw]);
disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio));
disk_stat_unlock();
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
bio_sectors(bio));
part_stat_unlock();
chunk_size = mddev->chunk_size >> 10;
chunk_sects = mddev->chunk_size >> 9;
......
......@@ -804,10 +804,11 @@ static int make_request(struct request_queue *q, struct bio * bio)
bitmap = mddev->bitmap;
cpu = disk_stat_lock();
disk_stat_inc(cpu, mddev->gendisk, ios[rw]);
disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio));
disk_stat_unlock();
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
bio_sectors(bio));
part_stat_unlock();
/*
* make_request() can abort the operation when READA is being
......
......@@ -844,10 +844,11 @@ static int make_request(struct request_queue *q, struct bio * bio)
*/
wait_barrier(conf);
cpu = disk_stat_lock();
disk_stat_inc(cpu, mddev->gendisk, ios[rw]);
disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio));
disk_stat_unlock();
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
bio_sectors(bio));
part_stat_unlock();
r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
......
......@@ -3396,10 +3396,11 @@ static int make_request(struct request_queue *q, struct bio * bi)
md_write_start(mddev, bi);
cpu = disk_stat_lock();
disk_stat_inc(cpu, mddev->gendisk, ios[rw]);
disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bi));
disk_stat_unlock();
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
bio_sectors(bi));
part_stat_unlock();
if (rw == READ &&
mddev->reshape_position == MaxSector &&
......
......@@ -210,15 +210,15 @@ ssize_t part_size_show(struct device *dev,
return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
}
static ssize_t part_stat_show(struct device *dev,
ssize_t part_stat_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct hd_struct *p = dev_to_part(dev);
int cpu;
cpu = disk_stat_lock();
cpu = part_stat_lock();
part_round_stats(cpu, p);
disk_stat_unlock();
part_stat_unlock();
return sprintf(buf,
"%8lu %8lu %8llu %8u "
"%8lu %8lu %8llu %8u "
......@@ -575,8 +575,8 @@ void del_gendisk(struct gendisk *disk)
set_capacity(disk, 0);
disk->flags &= ~GENHD_FL_UP;
unlink_gendisk(disk);
disk_stat_set_all(disk, 0);
disk->stamp = 0;
part_stat_set_all(&disk->part0, 0);
disk->part0.stamp = 0;
kobject_put(disk->part0.holder_dir);
kobject_put(disk->slave_dir);
......
......@@ -145,13 +145,6 @@ struct gendisk {
struct timer_rand_state *random;
atomic_t sync_io; /* RAID */
unsigned long stamp;
int in_flight;
#ifdef CONFIG_SMP
struct disk_stats *dkstats;
#else
struct disk_stats dkstats;
#endif
struct work_struct async_notify;
#ifdef CONFIG_BLK_DEV_INTEGRITY
struct blk_integrity *integrity;
......@@ -232,46 +225,18 @@ extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
* internal use only.
*/
#ifdef CONFIG_SMP
#define disk_stat_lock() ({ rcu_read_lock(); get_cpu(); })
#define disk_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
#define disk_stat_add(cpu, gendiskp, field, addnd) \
(per_cpu_ptr(gendiskp->dkstats, cpu)->field += addnd)
#define disk_stat_read(gendiskp, field) \
({ \
typeof(gendiskp->dkstats->field) res = 0; \
int i; \
for_each_possible_cpu(i) \
res += per_cpu_ptr(gendiskp->dkstats, i)->field; \
res; \
})
static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
{
int i;
for_each_possible_cpu(i)
memset(per_cpu_ptr(gendiskp->dkstats, i), value,
sizeof(struct disk_stats));
}
#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
#define part_stat_add(cpu, part, field, addnd) \
(per_cpu_ptr(part->dkstats, cpu)->field += addnd)
#define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \
({ \
if (part) \
part_stat_add(cpu, part, field, addnd); \
disk_stat_add(cpu, gendiskp, field, addnd); \
})
#define __part_stat_add(cpu, part, field, addnd) \
(per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
#define part_stat_read(part, field) \
({ \
typeof(part->dkstats->field) res = 0; \
typeof((part)->dkstats->field) res = 0; \
int i; \
for_each_possible_cpu(i) \
res += per_cpu_ptr(part->dkstats, i)->field; \
res += per_cpu_ptr((part)->dkstats, i)->field; \
res; \
})
......@@ -284,109 +249,73 @@ static inline void part_stat_set_all(struct hd_struct *part, int value)
sizeof(struct disk_stats));
}
#else /* !CONFIG_SMP */
#define disk_stat_lock() ({ rcu_read_lock(); 0; })
#define disk_stat_unlock() rcu_read_unlock()
#define disk_stat_add(cpu, gendiskp, field, addnd) \
(gendiskp->dkstats.field += addnd)
#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
static inline int init_part_stats(struct hd_struct *part)
{
memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
part->dkstats = alloc_percpu(struct disk_stats);
if (!part->dkstats)
return 0;
return 1;
}
#define part_stat_add(cpu, part, field, addnd) \
(part->dkstats.field += addnd)
#define all_stat_add(cpu, gendiskp, part, field, addnd, sector) \
({ \
if (part) \
part_stat_add(cpu, part, field, addnd); \
disk_stat_add(cpu, gendiskp, field, addnd); \
})
#define part_stat_read(part, field) (part->dkstats.field)
static inline void part_stat_set_all(struct hd_struct *part, int value)
static inline void free_part_stats(struct hd_struct *part)
{