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Message-Id: <1337817771-25038-8-git-send-email-koverstreet@google.com>
Date: Wed, 23 May 2012 17:02:44 -0700
From: Kent Overstreet <koverstreet@...gle.com>
To: linux-kernel@...r.kernel.org, linux-bcache@...r.kernel.org,
dm-devel@...hat.com, linux-fsdevel@...r.kernel.org
Cc: Kent Overstreet <koverstreet@...gle.com>, tj@...nel.org,
axboe@...nel.dk, agk@...hat.com, neilb@...e.de,
drbd-dev@...ts.linbit.com, bharrosh@...asas.com, vgoyal@...hat.com,
mpatocka@...hat.com, sage@...dream.net, yehuda@...newdream.net
Subject: [PATCH v2 07/14] 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>
Change-Id: I5604293e07f695c8f0106ae819e306f1def89a67
---
drivers/block/pktcdvd.c | 115 ++++++++++++++++-------------------------------
1 file 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);
-}
+ struct packet_data *pkt = bio->bi_private;
+ struct pktcdvd_device *pd = pkt->pd;
+ BUG_ON(!pd);
-static struct bio *pkt_bio_alloc(int nr_iovecs)
-{
- struct bio_vec *bvl = NULL;
- struct bio *bio;
+ VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio,
+ (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err);
- bio = kmalloc(sizeof(struct bio), GFP_KERNEL);
- if (!bio)
- goto no_bio;
- bio_init(bio);
+ if (err)
+ atomic_inc(&pkt->io_errors);
+ if (atomic_dec_and_test(&pkt->io_wait)) {
+ atomic_inc(&pkt->run_sm);
+ wake_up(&pd->wqueue);
+ }
+ pkt_bio_finished(pd);
+}
- bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL);
- if (!bvl)
- goto no_bvl;
+static void pkt_end_io_packet_write(struct bio *bio, int err)
+{
+ struct packet_data *pkt = bio->bi_private;
+ struct pktcdvd_device *pd = pkt->pd;
+ BUG_ON(!pd);
- bio->bi_max_vecs = nr_iovecs;
- bio->bi_io_vec = bvl;
- bio->bi_destructor = pkt_bio_destructor;
+ VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err);
- return bio;
+ pd->stats.pkt_ended++;
- no_bvl:
- kfree(bio);
- no_bio:
- return NULL;
+ pkt_bio_finished(pd);
+ atomic_dec(&pkt->io_wait);
+ atomic_inc(&pkt->run_sm);
+ wake_up(&pd->wqueue);
}
/*
@@ -567,10 +569,13 @@ 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 +586,12 @@ 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;
}
@@ -1036,40 +1044,6 @@ static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec)
}
}
-static void pkt_end_io_read(struct bio *bio, int err)
-{
- struct packet_data *pkt = bio->bi_private;
- struct pktcdvd_device *pd = pkt->pd;
- BUG_ON(!pd);
-
- VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio,
- (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err);
-
- if (err)
- atomic_inc(&pkt->io_errors);
- if (atomic_dec_and_test(&pkt->io_wait)) {
- atomic_inc(&pkt->run_sm);
- wake_up(&pd->wqueue);
- }
- pkt_bio_finished(pd);
-}
-
-static void pkt_end_io_packet_write(struct bio *bio, int err)
-{
- struct packet_data *pkt = bio->bi_private;
- struct pktcdvd_device *pd = pkt->pd;
- BUG_ON(!pd);
-
- VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err);
-
- pd->stats.pkt_ended++;
-
- pkt_bio_finished(pd);
- atomic_dec(&pkt->io_wait);
- atomic_inc(&pkt->run_sm);
- wake_up(&pd->wqueue);
-}
-
/*
* Schedule reads for the holes in a packet
*/
@@ -1111,21 +1085,15 @@ 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 +1386,9 @@ 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();
--
1.7.9.3.327.g2980b
--
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