From: Kent Overstreet <kmo@daterainc.com>
To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
hch@infradead.org
Cc: Kent Overstreet <kmo@daterainc.com>, Jens Axboe <axboe@kernel.dk>,
"Ed L. Cashin" <ecashin@coraid.com>
Subject: [PATCH 13/25] aoe: Convert to immutable biovecs
Date: Tue, 26 Nov 2013 16:45:16 -0800 [thread overview]
Message-ID: <1385513128-5035-13-git-send-email-kmo@daterainc.com> (raw)
In-Reply-To: <1385513128-5035-1-git-send-email-kmo@daterainc.com>
Now that we've got a mechanism for immutable biovecs -
bi_iter.bi_bvec_done - we need to convert drivers to use primitives that
respect it instead of using the bvec array directly.
The aoe code no longer has to manually iterate over partial bvecs, so
some struct members go away - other struct members are effectively
renamed:
buf->resid -> buf->iter.bi_size
buf->sector -> buf->iter.bi_sector
f->bcnt -> f->iter.bi_size
f->lba -> f->iter.bi_sector
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: "Ed L. Cashin" <ecashin@coraid.com>
---
drivers/block/aoe/aoe.h | 10 +---
drivers/block/aoe/aoecmd.c | 135 +++++++++++++++++----------------------------
2 files changed, 53 insertions(+), 92 deletions(-)
diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h
index 14a9d19..9220f8e 100644
--- a/drivers/block/aoe/aoe.h
+++ b/drivers/block/aoe/aoe.h
@@ -100,11 +100,8 @@ enum {
struct buf {
ulong nframesout;
- ulong resid;
- ulong bv_resid;
- sector_t sector;
struct bio *bio;
- struct bio_vec *bv;
+ struct bvec_iter iter;
struct request *rq;
};
@@ -120,13 +117,10 @@ struct frame {
ulong waited;
ulong waited_total;
struct aoetgt *t; /* parent target I belong to */
- sector_t lba;
struct sk_buff *skb; /* command skb freed on module exit */
struct sk_buff *r_skb; /* response skb for async processing */
struct buf *buf;
- struct bio_vec *bv;
- ulong bcnt;
- ulong bv_off;
+ struct bvec_iter iter;
char flags;
};
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 7a06aec..8184451 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -196,8 +196,7 @@ aoe_freetframe(struct frame *f)
t = f->t;
f->buf = NULL;
- f->lba = 0;
- f->bv = NULL;
+ memset(&f->iter, 0, sizeof(f->iter));
f->r_skb = NULL;
f->flags = 0;
list_add(&f->head, &t->ffree);
@@ -295,21 +294,14 @@ newframe(struct aoedev *d)
}
static void
-skb_fillup(struct sk_buff *skb, struct bio_vec *bv, ulong off, ulong cnt)
+skb_fillup(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter)
{
int frag = 0;
- ulong fcnt;
-loop:
- fcnt = bv->bv_len - (off - bv->bv_offset);
- if (fcnt > cnt)
- fcnt = cnt;
- skb_fill_page_desc(skb, frag++, bv->bv_page, off, fcnt);
- cnt -= fcnt;
- if (cnt <= 0)
- return;
- bv++;
- off = bv->bv_offset;
- goto loop;
+ struct bio_vec bv;
+
+ __bio_for_each_segment(bv, bio, iter, iter)
+ skb_fill_page_desc(skb, frag++, bv.bv_page,
+ bv.bv_offset, bv.bv_len);
}
static void
@@ -346,12 +338,10 @@ ata_rw_frameinit(struct frame *f)
t->nout++;
f->waited = 0;
f->waited_total = 0;
- if (f->buf)
- f->lba = f->buf->sector;
/* set up ata header */
- ah->scnt = f->bcnt >> 9;
- put_lba(ah, f->lba);
+ ah->scnt = f->iter.bi_size >> 9;
+ put_lba(ah, f->iter.bi_sector);
if (t->d->flags & DEVFL_EXT) {
ah->aflags |= AOEAFL_EXT;
} else {
@@ -360,11 +350,11 @@ ata_rw_frameinit(struct frame *f)
ah->lba3 |= 0xe0; /* LBA bit + obsolete 0xa0 */
}
if (f->buf && bio_data_dir(f->buf->bio) == WRITE) {
- skb_fillup(skb, f->bv, f->bv_off, f->bcnt);
+ skb_fillup(skb, f->buf->bio, f->iter);
ah->aflags |= AOEAFL_WRITE;
- skb->len += f->bcnt;
- skb->data_len = f->bcnt;
- skb->truesize += f->bcnt;
+ skb->len += f->iter.bi_size;
+ skb->data_len = f->iter.bi_size;
+ skb->truesize += f->iter.bi_size;
t->wpkts++;
} else {
t->rpkts++;
@@ -382,7 +372,6 @@ aoecmd_ata_rw(struct aoedev *d)
struct buf *buf;
struct sk_buff *skb;
struct sk_buff_head queue;
- ulong bcnt, fbcnt;
buf = nextbuf(d);
if (buf == NULL)
@@ -390,39 +379,22 @@ aoecmd_ata_rw(struct aoedev *d)
f = newframe(d);
if (f == NULL)
return 0;
- bcnt = d->maxbcnt;
- if (bcnt == 0)
- bcnt = DEFAULTBCNT;
- if (bcnt > buf->resid)
- bcnt = buf->resid;
- fbcnt = bcnt;
- f->bv = buf->bv;
- f->bv_off = f->bv->bv_offset + (f->bv->bv_len - buf->bv_resid);
- do {
- if (fbcnt < buf->bv_resid) {
- buf->bv_resid -= fbcnt;
- buf->resid -= fbcnt;
- break;
- }
- fbcnt -= buf->bv_resid;
- buf->resid -= buf->bv_resid;
- if (buf->resid == 0) {
- d->ip.buf = NULL;
- break;
- }
- buf->bv++;
- buf->bv_resid = buf->bv->bv_len;
- WARN_ON(buf->bv_resid == 0);
- } while (fbcnt);
/* initialize the headers & frame */
f->buf = buf;
- f->bcnt = bcnt;
- ata_rw_frameinit(f);
+ f->iter = buf->iter;
+ f->iter.bi_size = min_t(unsigned long,
+ d->maxbcnt ?: DEFAULTBCNT,
+ f->iter.bi_size);
+ bio_advance_iter(buf->bio, &buf->iter, f->iter.bi_size);
+
+ if (!buf->iter.bi_size)
+ d->ip.buf = NULL;
/* mark all tracking fields and load out */
buf->nframesout += 1;
- buf->sector += bcnt >> 9;
+
+ ata_rw_frameinit(f);
skb = skb_clone(f->skb, GFP_ATOMIC);
if (skb) {
@@ -613,10 +585,7 @@ reassign_frame(struct frame *f)
skb = nf->skb;
nf->skb = f->skb;
nf->buf = f->buf;
- nf->bcnt = f->bcnt;
- nf->lba = f->lba;
- nf->bv = f->bv;
- nf->bv_off = f->bv_off;
+ nf->iter = f->iter;
nf->waited = 0;
nf->waited_total = f->waited_total;
nf->sent = f->sent;
@@ -648,19 +617,19 @@ probe(struct aoetgt *t)
}
f->flags |= FFL_PROBE;
ifrotate(t);
- f->bcnt = t->d->maxbcnt ? t->d->maxbcnt : DEFAULTBCNT;
+ f->iter.bi_size = t->d->maxbcnt ? t->d->maxbcnt : DEFAULTBCNT;
ata_rw_frameinit(f);
skb = f->skb;
- for (frag = 0, n = f->bcnt; n > 0; ++frag, n -= m) {
+ for (frag = 0, n = f->iter.bi_size; n > 0; ++frag, n -= m) {
if (n < PAGE_SIZE)
m = n;
else
m = PAGE_SIZE;
skb_fill_page_desc(skb, frag, empty_page, 0, m);
}
- skb->len += f->bcnt;
- skb->data_len = f->bcnt;
- skb->truesize += f->bcnt;
+ skb->len += f->iter.bi_size;
+ skb->data_len = f->iter.bi_size;
+ skb->truesize += f->iter.bi_size;
skb = skb_clone(f->skb, GFP_ATOMIC);
if (skb) {
@@ -929,12 +898,8 @@ bufinit(struct buf *buf, struct request *rq, struct bio *bio)
memset(buf, 0, sizeof(*buf));
buf->rq = rq;
buf->bio = bio;
- buf->resid = bio->bi_iter.bi_size;
- buf->sector = bio->bi_iter.bi_sector;
+ buf->iter = bio->bi_iter;
bio_pageinc(bio);
- buf->bv = __bio_iovec(bio);
- buf->bv_resid = buf->bv->bv_len;
- WARN_ON(buf->bv_resid == 0);
}
static struct buf *
@@ -1119,24 +1084,18 @@ gettgt(struct aoedev *d, char *addr)
}
static void
-bvcpy(struct bio_vec *bv, ulong off, struct sk_buff *skb, long cnt)
+bvcpy(struct sk_buff *skb, struct bio *bio, struct bvec_iter iter, long cnt)
{
- ulong fcnt;
- char *p;
int soff = 0;
-loop:
- fcnt = bv->bv_len - (off - bv->bv_offset);
- if (fcnt > cnt)
- fcnt = cnt;
- p = page_address(bv->bv_page) + off;
- skb_copy_bits(skb, soff, p, fcnt);
- soff += fcnt;
- cnt -= fcnt;
- if (cnt <= 0)
- return;
- bv++;
- off = bv->bv_offset;
- goto loop;
+ struct bio_vec bv;
+
+ iter.bi_size = cnt;
+
+ __bio_for_each_segment(bv, bio, iter, iter) {
+ char *p = page_address(bv.bv_page) + bv.bv_offset;
+ skb_copy_bits(skb, soff, p, bv.bv_len);
+ soff += bv.bv_len;
+ }
}
void
@@ -1229,7 +1188,15 @@ noskb: if (buf)
clear_bit(BIO_UPTODATE, &buf->bio->bi_flags);
break;
}
- bvcpy(f->bv, f->bv_off, skb, n);
+ if (n > f->iter.bi_size) {
+ pr_err_ratelimited("%s e%ld.%d. bytes=%ld need=%u\n",
+ "aoe: too-large data size in read from",
+ (long) d->aoemajor, d->aoeminor,
+ n, f->iter.bi_size);
+ clear_bit(BIO_UPTODATE, &buf->bio->bi_flags);
+ break;
+ }
+ bvcpy(skb, f->buf->bio, f->iter, n);
case ATA_CMD_PIO_WRITE:
case ATA_CMD_PIO_WRITE_EXT:
spin_lock_irq(&d->lock);
@@ -1272,7 +1239,7 @@ out:
aoe_freetframe(f);
- if (buf && --buf->nframesout == 0 && buf->resid == 0)
+ if (buf && --buf->nframesout == 0 && buf->iter.bi_size == 0)
aoe_end_buf(d, buf);
spin_unlock_irq(&d->lock);
@@ -1727,7 +1694,7 @@ aoe_failbuf(struct aoedev *d, struct buf *buf)
{
if (buf == NULL)
return;
- buf->resid = 0;
+ buf->iter.bi_size = 0;
clear_bit(BIO_UPTODATE, &buf->bio->bi_flags);
if (buf->nframesout == 0)
aoe_end_buf(d, buf);
--
1.8.4.4
next prev parent reply other threads:[~2013-11-27 0:51 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-25 21:52 [GIT PULL] Immutable biovecs Kent Overstreet
2013-11-26 6:05 ` Christoph Hellwig
2013-11-27 0:44 ` Kent Overstreet
2013-11-27 0:45 ` [PATCH 01/25] block: submit_bio_wait() conversions Kent Overstreet
2013-11-27 0:45 ` [PATCH 02/25] block: Convert various code to bio_for_each_segment() Kent Overstreet
2013-11-27 0:45 ` [PATCH 03/25] bcache: Kill unaligned bvec hack Kent Overstreet
2013-11-27 0:45 ` [PATCH 05/25] dm: Use bvec_iter for dm_bio_record() Kent Overstreet
2013-11-27 0:45 ` [PATCH 06/25] block: Convert bio_iovec() to bvec_iter Kent Overstreet
2013-11-27 0:45 ` [PATCH 08/25] block: Immutable bio vecs Kent Overstreet
2013-11-27 0:45 ` [PATCH 09/25] block: Convert bio_copy_data() to bvec_iter Kent Overstreet
2013-11-27 0:45 ` [PATCH 10/25] bio-integrity: Convert " Kent Overstreet
2013-11-27 0:45 ` [PATCH 11/25] block: Kill bio_segments()/bi_vcnt usage Kent Overstreet
2013-11-27 0:45 ` [PATCH 12/25] block: Convert drivers to immutable biovecs Kent Overstreet
2013-11-27 0:45 ` Kent Overstreet [this message]
2013-11-27 0:45 ` [PATCH 14/25] ceph: Convert " Kent Overstreet
2013-11-27 0:45 ` [PATCH 15/25] block: Kill bio_iovec_idx(), __bio_iovec() Kent Overstreet
2013-11-27 0:45 ` [PATCH 16/25] block: Refactor bio_clone_bioset() for immutable biovecs Kent Overstreet
2013-11-27 0:45 ` [PATCH 17/25] block: Add bio_clone_fast() Kent Overstreet
2013-11-27 0:45 ` [PATCH 18/25] rbd: Refactor bio cloning Kent Overstreet
2013-11-27 0:45 ` [PATCH 19/25] dm: Refactor for new bio cloning/splitting Kent Overstreet
2013-11-27 0:45 ` [PATCH 20/25] block: Don't save/copy bvec array anymore Kent Overstreet
2013-11-27 0:45 ` [PATCH 21/25] block: Remove bi_idx hacks Kent Overstreet
2013-11-27 0:45 ` [PATCH 22/25] block: Generic bio chaining Kent Overstreet
2013-11-27 0:45 ` [PATCH 23/25] block: Rename bio_split() -> bio_pair_split() Kent Overstreet
2013-11-27 0:45 ` [PATCH 24/25] block: Introduce new bio_split() Kent Overstreet
2013-11-27 0:45 ` [PATCH 25/25] block: Kill bio_pair_split() Kent Overstreet
[not found] ` <1385513128-5035-4-git-send-email-kmo@daterainc.com>
2013-11-27 18:51 ` [PATCH 04/25] block: Abstract out bvec iterator Geoff Levand
2013-11-27 0:59 ` [GIT PULL] Immutable biovecs Jens Axboe
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