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libceph: encapsulate advancing msg page

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In write_partial_msg_pages(), once all the data from a page has been
sent we advance to the next one.  Put the code that takes care of
this into its own function.

While modifying write_partial_msg_pages(), make its local variable
"in_trail" be Boolean, and use the local variable "msg" (which is
just the connection's current out_msg pointer) consistently.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Alex Elder 2012-06-11 14:57:13 -05:00 committed by Sage Weil
parent 739c905baa
commit 84ca8fc87f
1 changed files with 34 additions and 24 deletions
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58
net/ceph/messenger.c
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@ -891,6 +891,33 @@ static void iter_bio_next(struct bio **bio_iter, int *seg)
}
#endif
static void out_msg_pos_next(struct ceph_connection *con, struct page *page,
size_t len, size_t sent, bool in_trail)
{
struct ceph_msg *msg = con->out_msg;
BUG_ON(!msg);
BUG_ON(!sent);
con->out_msg_pos.data_pos += sent;
con->out_msg_pos.page_pos += sent;
if (sent == len) {
con->out_msg_pos.page_pos = 0;
con->out_msg_pos.page++;
con->out_msg_pos.did_page_crc = false;
if (in_trail)
list_move_tail(&page->lru,
&msg->trail->head);
else if (msg->pagelist)
list_move_tail(&page->lru,
&msg->pagelist->head);
#ifdef CONFIG_BLOCK
else if (msg->bio)
iter_bio_next(&msg->bio_iter, &msg->bio_seg);
#endif
}
}
/*
* Write as much message data payload as we can. If we finish, queue
* up the footer.
@ -906,11 +933,11 @@ static int write_partial_msg_pages(struct ceph_connection *con)
bool do_datacrc = !con->msgr->nocrc;
int ret;
int total_max_write;
int in_trail = 0;
bool in_trail = false;
size_t trail_len = (msg->trail ? msg->trail->length : 0);
dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n",
con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages,
con, msg, con->out_msg_pos.page, msg->nr_pages,
con->out_msg_pos.page_pos);
#ifdef CONFIG_BLOCK
@ -934,13 +961,12 @@ static int write_partial_msg_pages(struct ceph_connection *con)
/* have we reached the trail part of the data? */
if (con->out_msg_pos.data_pos >= data_len - trail_len) {
in_trail = 1;
in_trail = true;
total_max_write = data_len - con->out_msg_pos.data_pos;
page = list_first_entry(&msg->trail->head,
struct page, lru);
max_write = PAGE_SIZE;
} else if (msg->pages) {
page = msg->pages[con->out_msg_pos.page];
} else if (msg->pagelist) {
@ -964,14 +990,14 @@ static int write_partial_msg_pages(struct ceph_connection *con)
if (do_datacrc && !con->out_msg_pos.did_page_crc) {
void *base;
u32 crc;
u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
u32 tmpcrc = le32_to_cpu(msg->footer.data_crc);
char *kaddr;
kaddr = kmap(page);
BUG_ON(kaddr == NULL);
base = kaddr + con->out_msg_pos.page_pos + bio_offset;
crc = crc32c(tmpcrc, base, len);
con->out_msg->footer.data_crc = cpu_to_le32(crc);
msg->footer.data_crc = cpu_to_le32(crc);
con->out_msg_pos.did_page_crc = true;
}
ret = ceph_tcp_sendpage(con->sock, page,
@ -984,30 +1010,14 @@ static int write_partial_msg_pages(struct ceph_connection *con)
if (ret <= 0)
goto out;
con->out_msg_pos.data_pos += ret;
con->out_msg_pos.page_pos += ret;
if (ret == len) {
con->out_msg_pos.page_pos = 0;
con->out_msg_pos.page++;
con->out_msg_pos.did_page_crc = false;
if (in_trail)
list_move_tail(&page->lru,
&msg->trail->head);
else if (msg->pagelist)
list_move_tail(&page->lru,
&msg->pagelist->head);
#ifdef CONFIG_BLOCK
else if (msg->bio)
iter_bio_next(&msg->bio_iter, &msg->bio_seg);
#endif
}
out_msg_pos_next(con, page, len, (size_t) ret, in_trail);
}
dout("write_partial_msg_pages %p msg %p done\n", con, msg);
/* prepare and queue up footer, too */
if (!do_datacrc)
con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
con_out_kvec_reset(con);
prepare_write_message_footer(con);
ret = 1;