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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: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Tejun Heo 2008-08-25 19:56:14 +09:00 committed by Jens Axboe
parent eddb2e26b5
commit 074a7aca7a
14 changed files with 168 additions and 299 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

84
block/blk-core.c
View File

@ -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_round_stats(cpu, part);
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_round_stats(cpu, part);
part->in_flight--;
}
part_stat_inc(cpu, part, ios[rw]);
part_stat_add(cpu, part, ticks[rw], duration);
part_round_stats(cpu, part);
part_dec_in_flight(part);
disk_stat_unlock();
part_stat_unlock();
}
if (req->end_io)

12
block/blk-merge.c
View File

@ -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_round_stats(cpu, part);
part_dec_in_flight(part);
disk_stat_unlock();
part_stat_unlock();
}
req->ioprio = ioprio_best(req->ioprio, next->ioprio);

97
block/genhd.c
View File

@ -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));
if (disk->driverfs_dev != NULL &&
disk->driverfs_dev->driver != NULL)
printk(" driver: %s\n",
disk->driverfs_dev->driver->name);
else
printk(" (driver?)\n");
disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
while ((part = disk_part_iter_next(&piter))) {
bool is_part0 = part == &disk->part0;
/* now show the partitions */
disk_part_iter_init(&piter, disk, 0);
while ((part = disk_part_iter_next(&piter)))
printk(" %s %10llu %s\n",
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");
} 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;
}

12
drivers/block/aoe/aoecmd.c
View File

@ -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

27
drivers/md/dm.c
View File

@ -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

9
drivers/md/linear.c
View File

@ -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;

4
drivers/md/md.c
View File

@ -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

9
drivers/md/multipath.c
View File

@ -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) {

9
drivers/md/raid0.c
View File

@ -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;

9
drivers/md/raid1.c
View File

@ -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

9
drivers/md/raid10.c
View File

@ -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);

9
drivers/md/raid5.c
View File

@ -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 &&

12
fs/partitions/check.c
View File

@ -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,
struct device_attribute *attr, char *buf)
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);

165
include/linux/genhd.h
View File

@ -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 part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
#define part_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_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; \
})
@ -284,74 +249,6 @@ 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)
{
memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
}
#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)
{
memset(&part->dkstats, value, sizeof(struct disk_stats));
}
#endif /* CONFIG_SMP */
#define disk_stat_dec(cpu, gendiskp, field) \
disk_stat_add(cpu, gendiskp, field, -1)
#define disk_stat_inc(cpu, gendiskp, field) \
disk_stat_add(cpu, gendiskp, field, 1)
#define disk_stat_sub(cpu, gendiskp, field, subnd) \
disk_stat_add(cpu, gendiskp, field, -subnd)
#define part_stat_dec(cpu, gendiskp, field) \
part_stat_add(cpu, gendiskp, field, -1)
#define part_stat_inc(cpu, gendiskp, field) \
part_stat_add(cpu, gendiskp, field, 1)
#define part_stat_sub(cpu, gendiskp, field, subnd) \
part_stat_add(cpu, gendiskp, field, -subnd)
#define all_stat_dec(cpu, gendiskp, field, sector) \
all_stat_add(cpu, gendiskp, field, -1, sector)
#define all_stat_inc(cpu, gendiskp, part, field, sector) \
all_stat_add(cpu, gendiskp, part, field, 1, sector)
#define all_stat_sub(cpu, gendiskp, part, field, subnd, sector) \
all_stat_add(cpu, gendiskp, part, field, -subnd, sector)
/* Inlines to alloc and free disk stats in struct gendisk */
#ifdef CONFIG_SMP
static inline int init_disk_stats(struct gendisk *disk)
{
disk->dkstats = alloc_percpu(struct disk_stats);
if (!disk->dkstats)
return 0;
return 1;
}
static inline void free_disk_stats(struct gendisk *disk)
{
free_percpu(disk->dkstats);
}
static inline int init_part_stats(struct hd_struct *part)
{
part->dkstats = alloc_percpu(struct disk_stats);
@ -365,14 +262,18 @@ static inline void free_part_stats(struct hd_struct *part)
free_percpu(part->dkstats);
}
#else /* CONFIG_SMP */
static inline int init_disk_stats(struct gendisk *disk)
{
return 1;
}
#else /* !CONFIG_SMP */
#define part_stat_lock() ({ rcu_read_lock(); 0; })
#define part_stat_unlock() rcu_read_unlock()
static inline void free_disk_stats(struct gendisk *disk)
#define __part_stat_add(cpu, part, field, addnd) \
((part)->dkstats.field += addnd)
#define part_stat_read(part, field) ((part)->dkstats.field)
static inline void part_stat_set_all(struct hd_struct *part, int value)
{
memset(&part->dkstats, value, sizeof(struct disk_stats));
}
static inline int init_part_stats(struct hd_struct *part)
@ -383,10 +284,38 @@ static inline int init_part_stats(struct hd_struct *part)
static inline void free_part_stats(struct hd_struct *part)
{
}
#endif /* CONFIG_SMP */
#endif /* CONFIG_SMP */
#define part_stat_add(cpu, part, field, addnd) do { \
__part_stat_add((cpu), (part), field, addnd); \
if ((part)->partno) \
__part_stat_add((cpu), &part_to_disk((part))->part0, \
field, addnd); \
} while (0)
#define part_stat_dec(cpu, gendiskp, field) \
part_stat_add(cpu, gendiskp, field, -1)
#define part_stat_inc(cpu, gendiskp, field) \
part_stat_add(cpu, gendiskp, field, 1)
#define part_stat_sub(cpu, gendiskp, field, subnd) \
part_stat_add(cpu, gendiskp, field, -subnd)
static inline void part_inc_in_flight(struct hd_struct *part)
{
part->in_flight++;
if (part->partno)
part_to_disk(part)->part0.in_flight++;
}
static inline void part_dec_in_flight(struct hd_struct *part)
{
part->in_flight--;
if (part->partno)
part_to_disk(part)->part0.in_flight--;
}
/* drivers/block/ll_rw_blk.c */
extern void disk_round_stats(int cpu, struct gendisk *disk);
extern void part_round_stats(int cpu, struct hd_struct *part);
/* drivers/block/genhd.c */
@ -595,6 +524,8 @@ extern void blk_unregister_region(dev_t devt, unsigned long range);
extern ssize_t part_size_show(struct device *dev,
struct device_attribute *attr, char *buf);
extern ssize_t part_stat_show(struct device *dev,
struct device_attribute *attr, char *buf);
#ifdef CONFIG_FAIL_MAKE_REQUEST
extern ssize_t part_fail_show(struct device *dev,
struct device_attribute *attr, char *buf);