linux-kernel - RE: [PATCH v2 4/6] block: loop: say goodby to bio

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Date:	Sat, 30 Aug 2014 22:14:41 +0000
From:	"Elliott, Robert (Server Storage)" <Elliott@...com>
To:	Ming Lei <ming.lei@...onical.com>, Jens Axboe <axboe@...nel.dk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dave Kleikamp <dave.kleikamp@...cle.com>
CC:	Zach Brown <zab@...bo.net>, Christoph Hellwig <hch@...radead.org>,
	"Maxim Patlasov" <mpatlasov@...allels.com>
Subject: RE: [PATCH v2 4/6] block: loop: say goodby to bio



> -----Original Message-----
> From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel-
> owner@...r.kernel.org] On Behalf Of Ming Lei
> Sent: Saturday, 30 August, 2014 11:08 AM
> To: Jens Axboe; linux-kernel@...r.kernel.org; Dave Kleikamp
> Cc: Zach Brown; Christoph Hellwig; Maxim Patlasov; Ming Lei
> Subject: [PATCH v2 4/6] block: loop: say goodby to bio
...
> -static int do_bio_filebacked(struct loop_device *lo, struct bio
> *bio)
> +static int do_req_filebacked(struct loop_device *lo, struct request
> *rq)
>  {
>  	loff_t pos;
>  	int ret;
> 
> -	pos = ((loff_t) bio->bi_iter.bi_sector << 9) + lo->lo_offset;
> +	pos = ((loff_t) blk_rq_pos(rq) << 9) + lo->lo_offset;
> 
> -	if (bio_rw(bio) == WRITE) {
> +	if (rq->cmd_flags & REQ_WRITE) {
>  		struct file *file = lo->lo_backing_file;
> 
> -		if (bio->bi_rw & REQ_FLUSH) {
> +		if (rq->cmd_flags & REQ_FLUSH) {
>  			ret = vfs_fsync(file, 0);
>  			if (unlikely(ret && ret != -EINVAL)) {
>  				ret = -EIO;
> @@ -436,7 +439,7 @@ static int do_bio_filebacked(struct loop_device
> *lo, struct bio *bio)
>  		 * encryption is enabled, because it may give an attacker
>  		 * useful information.
>  		 */
> -		if (bio->bi_rw & REQ_DISCARD) {
> +		if (rq->cmd_flags & REQ_DISCARD) {
>  			struct file *file = lo->lo_backing_file;
>  			int mode = FALLOC_FL_PUNCH_HOLE |
> FALLOC_FL_KEEP_SIZE;

Can a REQ_WRITE_SAME make it through to here?


---
Rob Elliott    HP Server Storage



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