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Subject[PATCH 10/13] block: move stats from disk to part0
Date
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.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
block/blk-core.c | 79 ++++++++----------------
block/blk-merge.c | 8 +--
block/genhd.c | 90 ++++++--------------------
drivers/block/aoe/aoecmd.c | 8 +-
drivers/md/dm.c | 15 +++--
drivers/md/linear.c | 4 +-
drivers/md/md.c | 4 +-
drivers/md/multipath.c | 4 +-
drivers/md/raid0.c | 4 +-
drivers/md/raid1.c | 4 +-
drivers/md/raid10.c | 4 +-
drivers/md/raid5.c | 4 +-
fs/partitions/check.c | 8 +-
include/linux/genhd.h | 150 ++++++++++++-------------------------------
14 files changed, 121 insertions(+), 265 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 332d695..d4186f3 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -64,14 +64,10 @@ static void drive_stat_acct(struct request *rq, int new_io)

part = disk_map_sector_rcu(rq->rq_disk, rq->sector);
if (!new_io)
- all_stat_inc(rq->rq_disk, part, merges[rw], rq->sector);
+ part_stat_inc(part, merges[rw]);
else {
- disk_round_stats(rq->rq_disk);
- rq->rq_disk->in_flight++;
- if (part) {
- part_round_stats(part);
- part->in_flight++;
- }
+ part_round_stats(part);
+ part_inc_in_flight(part);
}

rcu_read_unlock_preempt();
@@ -966,8 +962,21 @@ static inline void add_request(struct request_queue *q, struct request *req)
__elv_add_request(q, req, ELEVATOR_INSERT_SORT, 0);
}

+static void part_round_stats_single(struct hd_struct *part, unsigned long now)
+{
+ if (now == part->stamp)
+ return;
+
+ if (part->in_flight) {
+ __part_stat_add(part, time_in_queue,
+ part->in_flight * (now - part->stamp));
+ __part_stat_add(part, io_ticks, (now - part->stamp));
+ }
+ part->stamp = now;
+}
+
/**
- * disk_round_stats() - Round off the performance stats on a struct
+ * part_round_stats() - Round off the performance stats on a struct
* disk_stats.
*
* The average IO queue length and utilisation statistics are maintained
@@ -984,45 +993,15 @@ static inline void add_request(struct request_queue *q, struct request *req)
* CONTEXT:
* Preemption disabled.
*/
-void disk_round_stats(struct gendisk *disk)
-{
- unsigned long now = jiffies;
-
- if (now == disk->stamp)
- return;
-
- if (disk->in_flight) {
- disk_stat_add(disk, time_in_queue,
- disk->in_flight * (now - disk->stamp));
- disk_stat_add(disk, io_ticks, (now - disk->stamp));
- }
- disk->stamp = now;
-}
-EXPORT_SYMBOL_GPL(disk_round_stats);
-
-/**
- * part_round_stats() - Round off the performance stats on a struct
- * disk_stats.
- *
- * Please see disk_round_stats() for more information.
- *
- * CONTEXT:
- * Preemption disabled.
- */
void part_round_stats(struct hd_struct *part)
{
unsigned long now = jiffies;

- if (now == part->stamp)
- return;
-
- if (part->in_flight) {
- part_stat_add(part, time_in_queue,
- part->in_flight * (now - part->stamp));
- part_stat_add(part, io_ticks, (now - part->stamp));
- }
- part->stamp = now;
+ if (part->partno)
+ part_round_stats_single(&part_to_disk(part)->part0, now);
+ part_round_stats_single(part, now);
}
+EXPORT_SYMBOL_GPL(part_round_stats);

/*
* queue lock must be held
@@ -1557,8 +1536,7 @@ static int __end_that_request_first(struct request *req, int error,

rcu_read_lock_preempt();
part = disk_map_sector_rcu(req->rq_disk, req->sector);
- all_stat_add(req->rq_disk, part, sectors[rw],
- nr_bytes >> 9, req->sector);
+ part_stat_add(part, sectors[rw], nr_bytes >> 9);
rcu_read_unlock_preempt();
}

@@ -1748,15 +1726,10 @@ static void end_that_request_last(struct request *req, int error)
rcu_read_lock_preempt();

part = disk_map_sector_rcu(disk, req->sector);
-
- all_stat_inc(disk, part, ios[rw], req->sector);
- all_stat_add(disk, part, ticks[rw], duration, req->sector);
- disk_round_stats(disk);
- disk->in_flight--;
- if (part) {
- part_round_stats(part);
- part->in_flight--;
- }
+ part_stat_inc(part, ios[rw]);
+ part_stat_add(part, ticks[rw], duration);
+ part_round_stats(part);
+ part_dec_in_flight(part);

rcu_read_unlock_preempt();
}
diff --git a/block/blk-merge.c b/block/blk-merge.c
index 55456c8..a25a9f7 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -472,12 +472,8 @@ static int attempt_merge(struct request_queue *q, struct request *req,
rcu_read_lock_preempt();

part = disk_map_sector_rcu(req->rq_disk, req->sector);
- disk_round_stats(req->rq_disk);
- req->rq_disk->in_flight--;
- if (part) {
- part_round_stats(part);
- part->in_flight--;
- }
+ part_round_stats(part);
+ part_dec_in_flight(part);

rcu_read_unlock_preempt();
}
diff --git a/block/genhd.c b/block/genhd.c
index 21b8535..5d0f5d1 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -176,7 +176,7 @@ EXPORT_SYMBOL_GPL(disk_part_iter_stop);
* 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);

@@ -575,24 +575,23 @@ void __init printk_all_partitions(void)
* Note, unlike /proc/partitions, I am showing the numbers in
* hex - the same format as the root= option takes.
*/
- printk("%s %10llu %s",
- bdevt_str(disk_devt(sgp), devt_buf),
- (unsigned long long)get_capacity(sgp) >> 1,
- disk_name(sgp, 0, name_buf));
- if (sgp->driverfs_dev != NULL &&
- sgp->driverfs_dev->driver != NULL)
- printk(" driver: %s\n",
- sgp->driverfs_dev->driver->name);
- else
- printk(" (driver?)\n");
-
- /* now show the partitions */
disk_part_iter_start(&piter, sgp, 0);
- while ((part = disk_part_iter_next(&piter)))
- printk(" %s %10llu %s\n",
+ while ((part = disk_part_iter_next(&piter))) {
+ bool is_part0 = part == &sgp->part0;
+
+ printk("%s%s %10llu %s\n", is_part0 ? "" : " ",
bdevt_str(part_devt(part), devt_buf),
(unsigned long long)part->nr_sects >> 1,
disk_name(sgp, part->partno, name_buf));
+ if (is_part0) {
+ if (sgp->driverfs_dev != NULL &&
+ sgp->driverfs_dev->driver != NULL)
+ printk(" driver: %s\n",
+ sgp->driverfs_dev->driver->name);
+ else
+ printk(" (driver?)\n");
+ }
+ }
disk_part_iter_stop(&piter);
}

@@ -653,12 +652,7 @@ 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_start(&piter, sgp, 0);
+ disk_part_iter_start(&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)),
@@ -736,38 +730,12 @@ 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);
-
- preempt_disable();
- disk_round_stats(disk);
- preempt_enable();
- 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(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);
@@ -801,7 +769,7 @@ 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 = {
@@ -872,24 +840,8 @@ static int diskstats_show(struct seq_file *seqf, void *v)
"\n\n");
*/

- preempt_disable();
- disk_round_stats(gp);
- preempt_enable();
- 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_start(&piter, gp, 0);
+ disk_part_iter_start(&piter, gp, DISK_PITER_INCL_PART0);
while ((hd = disk_part_iter_next(&piter))) {
preempt_disable();
part_round_stats(hd);
@@ -1000,7 +952,7 @@ 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 +960,7 @@ 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;
}
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index b13e0b7..5dac67c 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -760,10 +760,10 @@ diskstats(struct gendisk *disk, struct bio *bio, ulong duration, sector_t sector
rcu_read_lock_preempt();

part = disk_map_sector_rcu(disk, sector);
- all_stat_inc(disk, part, ios[rw], sector);
- all_stat_add(disk, part, ticks[rw], duration, sector);
- all_stat_add(disk, part, sectors[rw], n_sect, sector);
- all_stat_add(disk, part, io_ticks, duration, sector);
+ part_stat_inc(part, ios[rw]);
+ part_stat_add(part, ticks[rw], duration);
+ part_stat_add(part, sectors[rw], n_sect);
+ part_stat_add(part, io_ticks, duration);

rcu_read_unlock_preempt();
}
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 47d92be..75751ac 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -381,9 +381,9 @@ static void start_io_acct(struct dm_io *io)
io->start_time = jiffies;

preempt_disable();
- disk_round_stats(dm_disk(md));
+ part_round_stats(&dm_disk(md)->part0);
preempt_enable();
- dm_disk(md)->in_flight = atomic_inc_return(&md->pending);
+ dm_disk(md)->part0.in_flight = atomic_inc_return(&md->pending);
}

static int end_io_acct(struct dm_io *io)
@@ -395,11 +395,12 @@ static int end_io_acct(struct dm_io *io)
int rw = bio_data_dir(bio);

preempt_disable();
- disk_round_stats(dm_disk(md));
- disk_stat_add(dm_disk(md), ticks[rw], duration);
+ part_round_stats(&dm_disk(md)->part0);
+ part_stat_add(&dm_disk(md)->part0, ticks[rw], duration);
preempt_enable();

- 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;
}
@@ -851,8 +852,8 @@ static int dm_request(struct request_queue *q, struct bio *bio)
down_read(&md->io_lock);

preempt_disable();
- disk_stat_inc(dm_disk(md), ios[rw]);
- disk_stat_add(dm_disk(md), sectors[rw], bio_sectors(bio));
+ part_stat_inc(&dm_disk(md)->part0, ios[rw]);
+ part_stat_add(&dm_disk(md)->part0, sectors[rw], bio_sectors(bio));
preempt_enable();

/*
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 7341196..0c01f5a 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -323,8 +323,8 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
}

preempt_disable();
- disk_stat_inc(mddev->gendisk, ios[rw]);
- disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio));
+ part_stat_inc(&mddev->gendisk->part0, ios[rw]);
+ part_stat_add(&mddev->gendisk->part0, sectors[rw], bio_sectors(bio));
preempt_enable();

tmp_dev = which_dev(mddev, bio->bi_sector);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index cff446f..ac85e47 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5395,8 +5395,8 @@ static int is_mddev_idle(mddev_t *mddev)
idle = 1;
rdev_for_each(rdev, tmp, 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
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 5db0a45..30d1c20 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -159,8 +159,8 @@ static int multipath_make_request (struct request_queue *q, struct bio * bio)
mp_bh->mddev = mddev;

preempt_disable();
- disk_stat_inc(mddev->gendisk, ios[rw]);
- disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio));
+ part_stat_inc(&mddev->gendisk->part0, ios[rw]);
+ part_stat_add(&mddev->gendisk->part0, sectors[rw], bio_sectors(bio));
preempt_enable();

mp_bh->path = multipath_map(conf);
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 2602b05..f7e08bc 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -404,8 +404,8 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio)
}

preempt_disable();
- disk_stat_inc(mddev->gendisk, ios[rw]);
- disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio));
+ part_stat_inc(&mddev->gendisk->part0, ios[rw]);
+ part_stat_add(&mddev->gendisk->part0, sectors[rw], bio_sectors(bio));
preempt_enable();

chunk_size = mddev->chunk_size >> 10;
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 1fd2c3d..8ff3aaa 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -805,8 +805,8 @@ static int make_request(struct request_queue *q, struct bio * bio)
bitmap = mddev->bitmap;

preempt_disable();
- disk_stat_inc(mddev->gendisk, ios[rw]);
- disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio));
+ part_stat_inc(&mddev->gendisk->part0, ios[rw]);
+ part_stat_add(&mddev->gendisk->part0, sectors[rw], bio_sectors(bio));
preempt_enable();

/*
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 2521b73..735c167 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -839,8 +839,8 @@ static int make_request(struct request_queue *q, struct bio * bio)
wait_barrier(conf);

preempt_disable();
- disk_stat_inc(mddev->gendisk, ios[rw]);
- disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bio));
+ part_stat_inc(&mddev->gendisk->part0, ios[rw]);
+ part_stat_add(&mddev->gendisk->part0, sectors[rw], bio_sectors(bio));
preempt_enable();

r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index bfd8b6c..8131245 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3581,8 +3581,8 @@ static int make_request(struct request_queue *q, struct bio * bi)
md_write_start(mddev, bi);

preempt_disable();
- disk_stat_inc(mddev->gendisk, ios[rw]);
- disk_stat_add(mddev->gendisk, sectors[rw], bio_sectors(bi));
+ part_stat_inc(&mddev->gendisk->part0, ios[rw]);
+ part_stat_add(&mddev->gendisk->part0, sectors[rw], bio_sectors(bi));
preempt_enable();

if (rw == READ &&
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index ddd0258..e4d4d5c 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -210,8 +210,8 @@ 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);

@@ -574,8 +574,8 @@ 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);
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 61448a9..d5d2ef9 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -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;
};

@@ -220,50 +213,23 @@ extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
* Macros to to operate on disk statistics:
*
* {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
- * and should be called with preemption disabled.
+ * {part|all}_stat_{add|sub|inc|dec}() modify the stat counters
*
- * {part|disk}_stat_read() can be called with preemption enabled.
+ * part_stat_read() can be called with preemption enabled.
*
- * {part|disk}_stat_set_all() are for internal use only.
+ * part_stat_{add|set_all}() and {init|free}_part_stats are for
+ * internal use only.
*/
#ifdef CONFIG_SMP
-#define disk_stat_add(gendiskp, field, addnd) \
- (per_cpu_ptr(gendiskp->dkstats, smp_processor_id())->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(part, field, addnd) \
- (per_cpu_ptr(part->dkstats, smp_processor_id())->field += addnd)
-
-#define all_stat_add(gendiskp, part, field, addnd, sector) \
-({ \
- if (part) \
- part_stat_add(part, field, addnd); \
- disk_stat_add(gendiskp, field, addnd); \
-})
+#define __part_stat_add(part, field, addnd) \
+ (per_cpu_ptr((part)->dkstats, smp_processor_id())->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; \
})

@@ -276,102 +242,68 @@ static inline void part_stat_set_all(struct hd_struct *part, int value)
sizeof(struct disk_stats));
}

-#else /* !CONFIG_SMP */
-#define disk_stat_add(gendiskp, field, addnd) \
- (gendiskp->dkstats.field += addnd)
-#define disk_stat_read(gendiskp, field) (gendiskp->dkstats.field)
+static inline int init_part_stats(struct hd_struct *part)
+{
+ part->dkstats = alloc_percpu(struct disk_stats);
+ if (!part->dkstats)
+ return 0;
+ return 1;
+}

-static inline void disk_stat_set_all(struct gendisk *gendiskp, int value)
+static inline void free_part_stats(struct hd_struct *part)
{
- memset(&gendiskp->dkstats, value, sizeof (struct disk_stats));
+ free_percpu(part->dkstats);
}

-#define part_stat_add(part, field, addnd) \
- (part->dkstats.field += addnd)
+#else /* !CONFIG_SMP */

-#define all_stat_add(gendiskp, part, field, addnd, sector) \
-({ \
- if (part) \
- part->dkstats.field += addnd; \
- disk_stat_add(gendiskp, field, addnd); \
-})
+#define __part_stat_add(part, field, addnd) \
+ ((part)->dkstats.field += (addnd))

-#define part_stat_read(part, field) (part->dkstats.field)
+#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(gendiskp, field) disk_stat_add(gendiskp, field, -1)
-#define disk_stat_inc(gendiskp, field) disk_stat_add(gendiskp, field, 1)
-#define disk_stat_sub(gendiskp, field, subnd) \
- disk_stat_add(gendiskp, field, -subnd)
-
-#define part_stat_dec(gendiskp, field) part_stat_add(gendiskp, field, -1)
-#define part_stat_inc(gendiskp, field) part_stat_add(gendiskp, field, 1)
-#define part_stat_sub(gendiskp, field, subnd) \
- part_stat_add(gendiskp, field, -subnd)
-
-#define all_stat_dec(gendiskp, field, sector) \
- all_stat_add(gendiskp, field, -1, sector)
-#define all_stat_inc(gendiskp, part, field, sector) \
- all_stat_add(gendiskp, part, field, 1, sector)
-#define all_stat_sub(gendiskp, part, field, subnd, sector) \
- all_stat_add(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);
- if (!part->dkstats)
- return 0;
return 1;
}

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;
-}
+#endif /* CONFIG_SMP */

-static inline void free_disk_stats(struct gendisk *disk)
-{
-}
+#define part_stat_add(part, field, addnd) \
+({ \
+ __part_stat_add((part), field, addnd); \
+ if ((part)->partno) \
+ __part_stat_add(&part_to_disk((part))->part0, field, addnd); \
+})

-static inline int init_part_stats(struct hd_struct *part)
+#define part_stat_dec(part, field) part_stat_add((part), field, -1)
+#define part_stat_inc(part, field) part_stat_add((part), field, 1)
+#define part_stat_sub(part, field, subnd) part_stat_add((part), field, -subnd)
+
+static inline void part_inc_in_flight(struct hd_struct *part)
{
- return 1;
+ part->in_flight++;
+ if (part->partno)
+ part_to_disk(part)->part0.in_flight++;
}

-static inline void free_part_stats(struct hd_struct *part)
+static inline void part_dec_in_flight(struct hd_struct *part)
{
+ part->in_flight--;
+ if (part->partno)
+ part_to_disk(part)->part0.in_flight--;
}
-#endif /* CONFIG_SMP */

/* drivers/block/ll_rw_blk.c */
-extern void disk_round_stats(struct gendisk *disk);
extern void part_round_stats(struct hd_struct *part);

/* drivers/block/genhd.c */
@@ -580,6 +512,8 @@ 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);
--
1.5.4.5


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