linux-kernel - Re: [PATCH 49/51] buffer, writeback: make __block_write_full

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Date:	Wed, 1 Jul 2015 21:21:02 +0200
From:	Jan Kara <jack@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org, jack@...e.cz,
	hch@...radead.org, hannes@...xchg.org,
	linux-fsdevel@...r.kernel.org, vgoyal@...hat.com,
	lizefan@...wei.com, cgroups@...r.kernel.org, linux-mm@...ck.org,
	mhocko@...e.cz, clm@...com, fengguang.wu@...el.com,
	david@...morbit.com, gthelen@...gle.com, khlebnikov@...dex-team.ru,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 49/51] buffer, writeback: make __block_write_full_page()
 honor cgroup writeback

On Fri 22-05-15 17:14:03, Tejun Heo wrote:
> [__]block_write_full_page() is used to implement ->writepage in
> various filesystems.  All writeback logic is now updated to handle
> cgroup writeback and the block cgroup to issue IOs for is encoded in
> writeback_control and can be retrieved from the inode; however,
> [__]block_write_full_page() currently ignores the blkcg indicated by
> inode and issues all bio's without explicit blkcg association.
> 
> This patch adds submit_bh_blkcg() which associates the bio with the
> specified blkio cgroup before issuing and uses it in
> __block_write_full_page() so that the issued bio's are associated with
> inode_to_wb_blkcg_css(inode).

One comment below...

> @@ -44,6 +45,9 @@
>  #include <trace/events/block.h>
>  
>  static int fsync_buffers_list(spinlock_t *lock, struct list_head *list);
> +static int submit_bh_blkcg(int rw, struct buffer_head *bh,
> +			   unsigned long bio_flags,

The argument bio_flags is unused. What is is good for?

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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