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Date: Mon, 26 Nov 2012 14:56:30 -0200
From: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
kernel-team@...ts.ubuntu.com
Cc: Alex Elder <elder@...tank.com>,
Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Subject: [PATCH 100/270] libceph: encapsulate advancing msg page
3.5.7u1 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Alex Elder <elder@...tank.com>
commit 84ca8fc87fcf4ab97bb8acdb59bf97bb4820cb14 upstream.
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@...tank.com>
Reviewed-by: Sage Weil <sage@...tank.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
---
net/ceph/messenger.c | 58 +++++++++++++++++++++++++++++---------------------
1 file changed, 34 insertions(+), 24 deletions(-)
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index c7efb92..434809c 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -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;
--
1.7.9.5
--
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