[dm-devel] [PATCH 14/14] block: add bio_start_io_acct_remapped for the benefit of DM

[Christoph Hellwig]

On Thu, Feb 10, 2022 at 05:38:32PM -0500, Mike Snitzer wrote:
> DM needs the ability to account a clone bio's IO to the original
> block_device. So add @orig_bdev argument to bio_start_io_acct_time.
> Rename bio_start_io_acct_time to bio_start_io_acct_remapped.
> Also, follow bio_end_io_acct and bio_end_io_acct_remapped pattern by
> moving bio_start_io_acct to blkdev.h and have it call
> bio_start_io_acct_remapped.
> 
> Improve DM to no longer need to play games with swizzling a clone
> bio's bi_bdev (in dm_submit_bio_remap) and remove DM's
> clone_and_start_io_acct() interface.

Please split the core block layer part of this out, reorder it before
the current patch 10 and then do the right thing in that patch from the
start.