On Aug 18, 2020, at 3:26 PM, Song Liu [off-list ref] wrote:

Currently, devices like md, bcache uses disk_[start|end]_io_acct to report
iostat. These functions couldn't get proper iostat for partitions on these
devices.

This set resolves this issue by introducing part_[begin|end]_io_acct, and
using them in md and bcache code.

Changes v1 => v2:
1. Refactor the code, as suggested by Christoph.
2. Include Coly's Reviewed-by tag.

Song Liu (3):
 block: introduce part_[begin|end]_io_acct
 md: use part_[begin|end]_io_acct instead of disk_[begin|end]_io_acct
 bcache: use part_[begin|end]_io_acct instead of
   disk_[begin|end]_io_acct

block/blk-core.c            | 39 +++++++++++++++++++++++++++++++------
drivers/md/bcache/request.c | 10 ++++++----
drivers/md/md.c             |  8 ++++----
include/linux/blkdev.h      |  5 +++++
4 files changed, 48 insertions(+), 14 deletions(-)

Hi Christoph, 

Does this version look good to you?

Thanks,
Song