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Message-ID: <20120809000850.GC7262@moria.home.lan>
Date: Wed, 8 Aug 2012 17:08:50 -0700
From: Kent Overstreet <koverstreet@...gle.com>
To: Tejun Heo <tj@...nel.org>
Cc: linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
dm-devel@...hat.com, axboe@...nel.dk, agk@...hat.com,
neilb@...e.de, drbd-dev@...ts.linbit.com, vgoyal@...hat.com,
mpatocka@...hat.com, sage@...dream.net, yehuda@...newdream.net,
Peter Osterlund <petero2@...ia.com>
Subject: Re: [PATCH v5 04/12] pktcdvd: Switch to bio_kmalloc()
On Wed, Aug 08, 2012 at 03:13:59PM -0700, Tejun Heo wrote:
> Hello,
>
> On Mon, Aug 06, 2012 at 03:08:33PM -0700, Kent Overstreet wrote:
> > This is prep work for killing bi_destructor - previously, pktcdvd had
> > its own pkt_bio_alloc which was basically duplication bio_kmalloc(),
> > necessitating its own bi_destructor implementation.
> >
> > v5: Un-reorder some functions, to make the patch easier to review
> >
> > Signed-off-by: Kent Overstreet <koverstreet@...gle.com>
>
> Please Cc: the maintainers. Cc'ing Peter Osterlund and keeping the
> whole body for him.
Whoops, thanks.
> Generally looks good to me. How is this tested?
Untested - no hardware for it.
>
> Thanks.
>
> > ---
> > drivers/block/pktcdvd.c | 67 +++++++++++-----------------------------------
> > 1 files changed, 16 insertions(+), 51 deletions(-)
> >
> > diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
> > index ba66e44..ae55f08 100644
> > --- a/drivers/block/pktcdvd.c
> > +++ b/drivers/block/pktcdvd.c
> > @@ -101,6 +101,8 @@ static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */
> > static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev);
> > static int pkt_remove_dev(dev_t pkt_dev);
> > static int pkt_seq_show(struct seq_file *m, void *p);
> > +static void pkt_end_io_read(struct bio *bio, int err);
> > +static void pkt_end_io_packet_write(struct bio *bio, int err);
> >
> >
> >
> > @@ -522,38 +524,6 @@ static void pkt_bio_finished(struct pktcdvd_device *pd)
> > }
> > }
> >
> > -static void pkt_bio_destructor(struct bio *bio)
> > -{
> > - kfree(bio->bi_io_vec);
> > - kfree(bio);
> > -}
> > -
> > -static struct bio *pkt_bio_alloc(int nr_iovecs)
> > -{
> > - struct bio_vec *bvl = NULL;
> > - struct bio *bio;
> > -
> > - bio = kmalloc(sizeof(struct bio), GFP_KERNEL);
> > - if (!bio)
> > - goto no_bio;
> > - bio_init(bio);
> > -
> > - bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL);
> > - if (!bvl)
> > - goto no_bvl;
> > -
> > - bio->bi_max_vecs = nr_iovecs;
> > - bio->bi_io_vec = bvl;
> > - bio->bi_destructor = pkt_bio_destructor;
> > -
> > - return bio;
> > -
> > - no_bvl:
> > - kfree(bio);
> > - no_bio:
> > - return NULL;
> > -}
> > -
> > /*
> > * Allocate a packet_data struct
> > */
> > @@ -567,10 +537,13 @@ static struct packet_data *pkt_alloc_packet_data(int frames)
> > goto no_pkt;
> >
> > pkt->frames = frames;
> > - pkt->w_bio = pkt_bio_alloc(frames);
> > + pkt->w_bio = bio_kmalloc(GFP_KERNEL, frames);
> > if (!pkt->w_bio)
> > goto no_bio;
> >
> > + pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
> > + pkt->w_bio->bi_private = pkt;
> > +
> > for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
> > pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
> > if (!pkt->pages[i])
> > @@ -581,9 +554,12 @@ static struct packet_data *pkt_alloc_packet_data(int frames)
> > bio_list_init(&pkt->orig_bios);
> >
> > for (i = 0; i < frames; i++) {
> > - struct bio *bio = pkt_bio_alloc(1);
> > + struct bio *bio = bio_kmalloc(GFP_KERNEL, 1);
> > if (!bio)
> > goto no_rd_bio;
> > +
> > + bio->bi_end_io = pkt_end_io_read;
> > + bio->bi_private = pkt;
> > pkt->r_bios[i] = bio;
> > }
> >
> > @@ -1111,21 +1087,15 @@ static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
> > * Schedule reads for missing parts of the packet.
> > */
> > for (f = 0; f < pkt->frames; f++) {
> > - struct bio_vec *vec;
> > -
> > int p, offset;
> > +
> > if (written[f])
> > continue;
> > +
> > bio = pkt->r_bios[f];
> > - vec = bio->bi_io_vec;
> > - bio_init(bio);
> > - bio->bi_max_vecs = 1;
> > - bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
> > - bio->bi_bdev = pd->bdev;
> > - bio->bi_end_io = pkt_end_io_read;
> > - bio->bi_private = pkt;
> > - bio->bi_io_vec = vec;
> > - bio->bi_destructor = pkt_bio_destructor;
> > + bio_reset(bio);
> > + bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
> > + bio->bi_bdev = pd->bdev;
> >
> > p = (f * CD_FRAMESIZE) / PAGE_SIZE;
> > offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
> > @@ -1418,14 +1388,9 @@ static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
> > }
> >
> > /* Start the write request */
> > - bio_init(pkt->w_bio);
> > - pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE;
> > + bio_reset(pkt->w_bio);
> > pkt->w_bio->bi_sector = pkt->sector;
> > pkt->w_bio->bi_bdev = pd->bdev;
> > - pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
> > - pkt->w_bio->bi_private = pkt;
> > - pkt->w_bio->bi_io_vec = bvec;
> > - pkt->w_bio->bi_destructor = pkt_bio_destructor;
> > for (f = 0; f < pkt->frames; f++)
> > if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset))
> > BUG();
> > --
> > 1.7.7.3
> >
>
> --
> tejun
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