linux-kernel - Re: [PATCH 2/3] zram: do not pass rw argument to __zram_make

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Message-ID: <20140114111311.GD2180@swordfish.minsk.epam.com>
Date:	Tue, 14 Jan 2014 14:13:11 +0300
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Jerome Marchand <jmarchan@...hat.com>
Cc:	Minchan Kim <minchan@...nel.org>, Nitin Gupta <ngupta@...are.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] zram: do not pass rw argument to
 __zram_make_request()

On (01/14/14 12:02), Jerome Marchand wrote:
> >  static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index,
> > -			int offset, struct bio *bio, int rw)
> > +			int offset, struct bio *bio)
> >  {
> >  	int ret;
> > +	int rw = bio_data_dir(bio);
> >  
> > -	if (rw == READ)
> > +	if (rw == READA)
> > +		rw = READ;
> 
> This could never happen: bio_data_dir() can only return READ or WRITE.
> 

thanks. my bad. will replace with bio_rw().

	-ss

> Jerome
> 
> > +
> > +	if (rw == READ) {
> > +		atomic64_inc(&zram->stats.num_reads);
> >  		ret = zram_bvec_read(zram, bvec, index, offset, bio);
> > -	else
> > +	} else {
> > +		atomic64_inc(&zram->stats.num_writes);
> >  		ret = zram_bvec_write(zram, bvec, index, offset);
> > +	}
> >  
> >  	return ret;
> >  }
> > @@ -670,22 +677,13 @@ out:
> >  	return ret;
> >  }
> >  
> > -static void __zram_make_request(struct zram *zram, struct bio *bio, int rw)
> > +static void __zram_make_request(struct zram *zram, struct bio *bio)
> >  {
> >  	int offset;
> >  	u32 index;
> >  	struct bio_vec bvec;
> >  	struct bvec_iter iter;
> >  
> > -	switch (rw) {
> > -	case READ:
> > -		atomic64_inc(&zram->stats.num_reads);
> > -		break;
> > -	case WRITE:
> > -		atomic64_inc(&zram->stats.num_writes);
> > -		break;
> > -	}
> > -
> >  	index = bio->bi_iter.bi_sector >> SECTORS_PER_PAGE_SHIFT;
> >  	offset = (bio->bi_iter.bi_sector &
> >  		  (SECTORS_PER_PAGE - 1)) << SECTOR_SHIFT;
> > @@ -704,16 +702,15 @@ static void __zram_make_request(struct zram *zram, struct bio *bio, int rw)
> >  			bv.bv_len = max_transfer_size;
> >  			bv.bv_offset = bvec.bv_offset;
> >  
> > -			if (zram_bvec_rw(zram, &bv, index, offset, bio, rw) < 0)
> > +			if (zram_bvec_rw(zram, &bv, index, offset, bio) < 0)
> >  				goto out;
> >  
> >  			bv.bv_len = bvec.bv_len - max_transfer_size;
> >  			bv.bv_offset += max_transfer_size;
> > -			if (zram_bvec_rw(zram, &bv, index+1, 0, bio, rw) < 0)
> > +			if (zram_bvec_rw(zram, &bv, index + 1, 0, bio) < 0)
> >  				goto out;
> >  		} else
> > -			if (zram_bvec_rw(zram, &bvec, index, offset, bio, rw)
> > -			    < 0)
> > +			if (zram_bvec_rw(zram, &bvec, index, offset, bio) < 0)
> >  				goto out;
> >  
> >  		update_position(&index, &offset, &bvec);
> > @@ -743,7 +740,7 @@ static void zram_make_request(struct request_queue *queue, struct bio *bio)
> >  		goto error;
> >  	}
> >  
> > -	__zram_make_request(zram, bio, bio_data_dir(bio));
> > +	__zram_make_request(zram, bio);
> >  	up_read(&zram->init_lock);
> >  
> >  	return;
> > 
> 
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