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>
diff --git a/block/genhd.c b/block/genhd.c
index 06a252f..e1cb96f 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -176,7 +176,7 @@
* 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 @@
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 @@
* 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 @@
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 @@
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 @@
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 @@
"\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 @@
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 @@
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;
}