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block: move stats from disk to part0

Browse source 
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 <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2008-08-25 19:56:14 +09:00 • committed by Jens Axboe
commit 074a7aca7a
14 changed files with 165 additions and 296 deletions
Download patch file Download diff file Expand all files Collapse all files

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;
}