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Date: Wed, 27 Mar 2013 10:39:43 -0700
From: Kent Overstreet <koverstreet@...gle.com>
To: axboe@...nel.dk, linux-kernel@...r.kernel.org,
linux-fsdevel@...r.kernel.org, dm-devel@...r.kernel.org
Cc: tj@...nel.org, neilb@...e.de,
Kent Overstreet <koverstreet@...gle.com>,
Sage Weil <sage@...tank.com>, ceph-devel@...r.kernel.org
Subject: [PATCH 13/22] ceph: Convert to bvec_iter
Use new primitives which respect bi_bvec_done.
Signed-off-by: Kent Overstreet <koverstreet@...gle.com>
Cc: Sage Weil <sage@...tank.com>
Cc: ceph-devel@...r.kernel.org
---
include/linux/ceph/messenger.h | 3 ++-
net/ceph/messenger.c | 53 ++++++++++++++++++++++--------------------
2 files changed, 30 insertions(+), 26 deletions(-)
diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenger.h
index 60903e0..dccf497 100644
--- a/include/linux/ceph/messenger.h
+++ b/include/linux/ceph/messenger.h
@@ -1,6 +1,7 @@
#ifndef __FS_CEPH_MESSENGER_H
#define __FS_CEPH_MESSENGER_H
+#include <linux/blk_types.h>
#include <linux/kref.h>
#include <linux/mutex.h>
#include <linux/net.h>
@@ -86,7 +87,7 @@ struct ceph_msg {
#ifdef CONFIG_BLOCK
struct bio *bio; /* instead of pages/pagelist */
struct bio *bio_iter; /* bio iterator */
- int bio_seg; /* current bio segment */
+ struct bvec_iter bvec_iter; /* current bio segment */
#endif /* CONFIG_BLOCK */
struct ceph_pagelist *trail; /* the trailing part of the data */
bool front_is_vmalloc;
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 0c102ec..ee88ae4 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -697,27 +697,30 @@ static void con_out_kvec_add(struct ceph_connection *con,
}
#ifdef CONFIG_BLOCK
-static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg)
+static void init_bio_iter(struct bio *bio, struct bio **iter,
+ struct bvec_iter *bvec_iter)
{
if (!bio) {
*iter = NULL;
- *seg = 0;
return;
}
*iter = bio;
- *seg = bio->bi_iter.bi_idx;
+ *bvec_iter = bio->bi_iter;
}
-static void iter_bio_next(struct bio **bio_iter, int *seg)
+static void iter_bio_next(struct bio **bio_iter, struct bvec_iter *bvec_iter)
{
+ struct bio_vec bv;
+
if (*bio_iter == NULL)
return;
- BUG_ON(*seg >= (*bio_iter)->bi_vcnt);
+ BUG_ON(!bvec_iter->bi_size);
+ bv = bio_iovec_iter(*bio_iter, *bvec_iter);
- (*seg)++;
- if (*seg == (*bio_iter)->bi_vcnt)
- init_bio_iter((*bio_iter)->bi_next, bio_iter, seg);
+ bio_advance_iter(*bio_iter, bvec_iter, bv.bv_len);
+ if (!bvec_iter->bi_size)
+ init_bio_iter((*bio_iter)->bi_next, bio_iter, bvec_iter);
}
#endif
@@ -736,7 +739,7 @@ static void prepare_write_message_data(struct ceph_connection *con)
con->out_msg_pos.page_pos = 0;
#ifdef CONFIG_BLOCK
if (msg->bio)
- init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
+ init_bio_iter(msg->bio, &msg->bio_iter, &msg->bvec_iter);
#endif
con->out_msg_pos.data_pos = 0;
con->out_msg_pos.did_page_crc = false;
@@ -1047,7 +1050,7 @@ static void out_msg_pos_next(struct ceph_connection *con, struct page *page,
&msg->pagelist->head);
#ifdef CONFIG_BLOCK
else if (msg->bio)
- iter_bio_next(&msg->bio_iter, &msg->bio_seg);
+ iter_bio_next(&msg->bio_iter, &msg->bvec_iter);
#endif
}
@@ -1103,12 +1106,12 @@ static int write_partial_msg_pages(struct ceph_connection *con)
struct page, lru);
#ifdef CONFIG_BLOCK
} else if (msg->bio) {
- struct bio_vec *bv;
+ struct bio_vec bv;
- bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
- page = bv->bv_page;
- bio_offset = bv->bv_offset;
- max_write = bv->bv_len;
+ bv = bio_iovec_iter(msg->bio_iter, msg->bvec_iter);
+ page = bv.bv_page;
+ bio_offset = bv.bv_offset;
+ max_write = bv.bv_len;
#endif
} else {
page = zero_page;
@@ -1818,17 +1821,18 @@ static int read_partial_message_pages(struct ceph_connection *con,
#ifdef CONFIG_BLOCK
static int read_partial_message_bio(struct ceph_connection *con,
- struct bio **bio_iter, int *bio_seg,
+ struct bio **bio_iter,
+ struct bvec_iter *bvec_iter,
unsigned int data_len, bool do_datacrc)
{
- struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
+ struct bio_vec bv = bio_iovec_iter(*bio_iter, *bvec_iter);
void *p;
int ret, left;
left = min((int)(data_len - con->in_msg_pos.data_pos),
- (int)(bv->bv_len - con->in_msg_pos.page_pos));
+ (int)(bv.bv_len - con->in_msg_pos.page_pos));
- p = kmap(bv->bv_page) + bv->bv_offset;
+ p = kmap(bv.bv_page) + bv.bv_offset;
ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
left);
@@ -1836,14 +1840,14 @@ static int read_partial_message_bio(struct ceph_connection *con,
con->in_data_crc =
crc32c(con->in_data_crc,
p + con->in_msg_pos.page_pos, ret);
- kunmap(bv->bv_page);
+ kunmap(bv.bv_page);
if (ret <= 0)
return ret;
con->in_msg_pos.data_pos += ret;
con->in_msg_pos.page_pos += ret;
- if (con->in_msg_pos.page_pos == bv->bv_len) {
+ if (con->in_msg_pos.page_pos == bv.bv_len) {
con->in_msg_pos.page_pos = 0;
- iter_bio_next(bio_iter, bio_seg);
+ iter_bio_next(bio_iter, bvec_iter);
}
return ret;
@@ -1945,7 +1949,7 @@ static int read_partial_message(struct ceph_connection *con)
#ifdef CONFIG_BLOCK
if (m->bio)
- init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg);
+ init_bio_iter(m->bio, &m->bio_iter, &m->bvec_iter);
#endif
}
@@ -1975,7 +1979,7 @@ static int read_partial_message(struct ceph_connection *con)
} else if (m->bio) {
BUG_ON(!m->bio_iter);
ret = read_partial_message_bio(con,
- &m->bio_iter, &m->bio_seg,
+ &m->bio_iter, &m->bvec_iter,
data_len, do_datacrc);
if (ret <= 0)
return ret;
@@ -2720,7 +2724,6 @@ struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
#ifdef CONFIG_BLOCK
m->bio = NULL;
m->bio_iter = NULL;
- m->bio_seg = 0;
#endif /* CONFIG_BLOCK */
m->trail = NULL;
--
1.8.1.3
--
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