linux.git/include/linux/genhd.h, branch v5.10-rc2

block: move the NEED_PART_SCAN flag to struct gendisk

2020-09-23T16:43:18+00:00

We can only scan for partitions on the whole disk, so move the flag
from struct block_device to struct gendisk.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

block: remove check_disk_change

2020-09-10T15:32:31+00:00

Remove the now unused check_disk_change helper.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Johannes Thumshirn 
Reviewed-by: Hannes Reinecke 
Signed-off-by: Jens Axboe

block: add a bdev_check_media_change helper

2020-09-10T15:32:30+00:00

Like check_disk_changed, except that it does not call ->revalidate_disk
but leaves that to the caller.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Johannes Thumshirn 
Reviewed-by: Hannes Reinecke 
Signed-off-by: Jens Axboe

block: remove revalidate_disk()

2020-09-02T14:00:26+00:00

Remove the now unused helper.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Josef Bacik 
Reviewed-by: Johannes Thumshirn 
Acked-by: Song Liu 
Signed-off-by: Jens Axboe

block: use revalidate_disk_size in set_capacity_revalidate_and_notify

2020-09-02T14:00:07+00:00

Only virtio_blk and xen-blkfront set the revalidate argument to true,
and both do not implement the ->revalidate_disk method.  So switch
to the helper that just updates the size instead.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Josef Bacik 
Reviewed-by: Johannes Thumshirn 
Signed-off-by: Jens Axboe

block: add a new revalidate_disk_size helper

2020-09-02T14:00:07+00:00

revalidate_disk is a relative awkward helper for driver use, as it first
calls an optional driver method and then updates the block device size,
while most callers either don't need the method call at all, or want to
keep state between the caller and the called method.

Add a revalidate_disk_size helper that just performs the update of the
block device size from the gendisk one, and switch all drivers that do
not implement ->revalidate_disk to use the new helper instead of
revalidate_disk()

Signed-off-by: Christoph Hellwig 
Reviewed-by: Josef Bacik 
Reviewed-by: Johannes Thumshirn 
Acked-by: Song Liu 
Signed-off-by: Jens Axboe

block: remove the discard_alignment field from struct hd_struct

2020-09-01T22:49:26+00:00

The alignment offset is only used in slow path callers, so just calculate
it on the fly.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

block: remove the alignment_offset field from struct hd_struct

2020-09-01T22:49:26+00:00

The alignment offset is only used in slow path callers, so just calculate
it on the fly.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

block: replace bd_set_size with bd_set_nr_sectors

2020-09-01T22:49:25+00:00

Replace bd_set_size with a version that takes the number of sectors
instead, as that fits most of the current and future callers much better.

Signed-off-by: Christoph Hellwig 
Reviewed-by: Hannes Reinecke 
Reviewed-by: Sagi Grimberg 
Signed-off-by: Jens Axboe

blk-cgroup: show global disk stats in root cgroup io.stat

2020-07-18T02:18:00+00:00

In order to improve consistency and usability in cgroup stat accounting,
we would like to support the root cgroup's io.stat.

Since the root cgroup has processes doing io even if the system has no
explicitly created cgroups, we need to be careful to avoid overhead in
that case.  For that reason, the rstat algorithms don't handle the root
cgroup, so just turning the file on wouldn't give correct statistics.

To get around this, we simulate flushing the iostat struct by filling it
out directly from global disk stats. The result is a root cgroup io.stat
file consistent with both /proc/diskstats and io.stat.

Note that in order to collect the disk stats, we needed to iterate over
devices. To facilitate that, we had to change the linkage of a disk_type
to external so that it can be used from blk-cgroup.c to iterate over
disks.

Suggested-by: Tejun Heo 
Signed-off-by: Boris Burkov 
Acked-by: Tejun Heo 
Signed-off-by: Jens Axboe