On Tue 10-10-17 08:54:40, Tejun Heo wrote:
> Implement submit_bh_blkcg_css() which will be used to override cgroup
> membership on specific buffer_heads.
>
> v2: Reimplemented using create_bh_bio() as suggested by Jan.
>
> Signed-off-by: Tejun Heo <t...@kernel.org>
> Cc: Jan Kara <j...@suse.cz>
> Cc: Jens Axboe <ax...@kernel.dk>
Looks good. You can add:
Reviewed-by: Jan Kara <j...@suse.cz>
Honza
> ---
> fs/buffer.c | 12 ++++++++++++
> include/linux/buffer_head.h | 3 +++
> 2 files changed, 15 insertions(+)
>
> diff --git a/fs/buffer.c b/fs/buffer.c
> index b4b2169..ed0e473 100644
> --- a/fs/buffer.c
> +++ b/fs/buffer.c
> @@ -3147,6 +3147,18 @@ static int submit_bh_wbc(int op, int op_flags, struct
> buffer_head *bh,
> return 0;
> }
>
> +int submit_bh_blkcg_css(int op, int op_flags, struct buffer_head *bh,
> + struct cgroup_subsys_state *blkcg_css)
> +{
> + struct bio *bio;
> +
> + bio = create_bh_bio(op, op_flags, bh, 0);
> + bio_associate_blkcg(bio, blkcg_css);
> + submit_bio(bio);
> + return 0;
> +}
> +EXPORT_SYMBOL(submit_bh_blkcg_css);
> +
> int submit_bh(int op, int op_flags, struct buffer_head *bh)
> {
> struct bio *bio;
> diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
> index c8dae55..dca5b3b 100644
> --- a/include/linux/buffer_head.h
> +++ b/include/linux/buffer_head.h
> @@ -13,6 +13,7 @@
> #include <linux/pagemap.h>
> #include <linux/wait.h>
> #include <linux/atomic.h>
> +#include <linux/cgroup.h>
>
> #ifdef CONFIG_BLOCK
>
> @@ -197,6 +198,8 @@ void ll_rw_block(int, int, int, struct buffer_head *
> bh[]);
> int sync_dirty_buffer(struct buffer_head *bh);
> int __sync_dirty_buffer(struct buffer_head *bh, int op_flags);
> void write_dirty_buffer(struct buffer_head *bh, int op_flags);
> +int submit_bh_blkcg_css(int op, int op_flags, struct buffer_head *bh,
> + struct cgroup_subsys_state *blkcg_css);
> int submit_bh(int, int, struct buffer_head *);
> void write_boundary_block(struct block_device *bdev,
> sector_t bblock, unsigned blocksize);
> --
> 2.9.5
>
--
Jan Kara <j...@suse.com>
SUSE Labs, CR
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