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Message-ID: <20120725230142.GB8673@moria.home.lan>
Date: Wed, 25 Jul 2012 16:01:42 -0700
From: Kent Overstreet <koverstreet@...gle.com>
To: Boaz Harrosh <bharrosh@...asas.com>
Cc: linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
dm-devel@...hat.com, tj@...nel.org, 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
Subject: Re: [PATCH v4 04/12] pktcdvd: Switch to bio_kmalloc()
On Wed, Jul 25, 2012 at 02:29:59PM +0300, Boaz Harrosh wrote:
> On 07/24/2012 11:11 PM, 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.
> >
> > Signed-off-by: Kent Overstreet <koverstreet@...gle.com>
> > ---
> > drivers/block/pktcdvd.c | 115 ++++++++++++++++-------------------------------
> > 1 files changed, 39 insertions(+), 76 deletions(-)
> >
> > diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
> > index ba66e44..6fe693a 100644
> > --- a/drivers/block/pktcdvd.c
> > +++ b/drivers/block/pktcdvd.c
> > @@ -522,36 +522,38 @@ static void pkt_bio_finished(struct pktcdvd_device *pd)
> > }
> > }
> >
> > -static void pkt_bio_destructor(struct bio *bio)
> > +static void pkt_end_io_read(struct bio *bio, int err)
> > {
> > - kfree(bio->bi_io_vec);
> > - kfree(bio);
> > -}
>
>
> Again here, you decided to move the pkt_end_io_read && pkt_end_io_packet_write
> functions from below, to above here. Which makes it impossible to find
> any bugs by just reviewing the patch.
>
> So I have not reviewed it.
>
> I know that you wanted so you can reference them at pkt_alloc_packet_data.
> I'd use a forward reference, in this case. And a move in a next patch. But
> this is just me. Perhaps the owner of this code can review it?
Yeah, I tend to be pretty anal about unnecessary forward declarations.
Overly anal in this case, I suppose. Here's a better patch:
commit 88cb170314bfa6cc90af37e433c07927b3b79ed2
Author: Kent Overstreet <koverstreet@...gle.com>
Date: Wed Jul 25 16:00:00 2012 -0700
pktcdvd: Switch to bio_kmalloc()
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.
Signed-off-by: Kent Overstreet <koverstreet@...gle.com>
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();
--
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