libceph: have cursor point to data
Rather than having a ceph message data item point to the cursor it's
associated with, have the cursor point to a data item. This will
allow a message cursor to be used for more than one data item.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 4626da3..3aa0f30 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -722,10 +722,10 @@
* entry in the current bio iovec, or the first entry in the next
* bio in the list.
*/
-static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data *data,
+static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor *cursor,
size_t length)
{
- struct ceph_msg_data_cursor *cursor = data->cursor;
+ struct ceph_msg_data *data = cursor->data;
struct bio *bio;
BUG_ON(data->type != CEPH_MSG_DATA_BIO);
@@ -741,11 +741,11 @@
cursor->last_piece = length <= bio->bi_io_vec[0].bv_len;
}
-static struct page *ceph_msg_data_bio_next(struct ceph_msg_data *data,
+static struct page *ceph_msg_data_bio_next(struct ceph_msg_data_cursor *cursor,
size_t *page_offset,
size_t *length)
{
- struct ceph_msg_data_cursor *cursor = data->cursor;
+ struct ceph_msg_data *data = cursor->data;
struct bio *bio;
struct bio_vec *bio_vec;
unsigned int index;
@@ -772,14 +772,14 @@
return bio_vec->bv_page;
}
-static bool ceph_msg_data_bio_advance(struct ceph_msg_data *data, size_t bytes)
+static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor *cursor,
+ size_t bytes)
{
- struct ceph_msg_data_cursor *cursor = data->cursor;
struct bio *bio;
struct bio_vec *bio_vec;
unsigned int index;
- BUG_ON(data->type != CEPH_MSG_DATA_BIO);
+ BUG_ON(cursor->data->type != CEPH_MSG_DATA_BIO);
bio = cursor->bio;
BUG_ON(!bio);
@@ -823,10 +823,10 @@
* For a page array, a piece comes from the first page in the array
* that has not already been fully consumed.
*/
-static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data *data,
+static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor *cursor,
size_t length)
{
- struct ceph_msg_data_cursor *cursor = data->cursor;
+ struct ceph_msg_data *data = cursor->data;
int page_count;
BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
@@ -845,11 +845,11 @@
cursor->last_piece = (size_t)cursor->page_offset + length <= PAGE_SIZE;
}
-static struct page *ceph_msg_data_pages_next(struct ceph_msg_data *data,
- size_t *page_offset,
- size_t *length)
+static struct page *
+ceph_msg_data_pages_next(struct ceph_msg_data_cursor *cursor,
+ size_t *page_offset, size_t *length)
{
- struct ceph_msg_data_cursor *cursor = data->cursor;
+ struct ceph_msg_data *data = cursor->data;
BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
@@ -865,12 +865,10 @@
return data->pages[cursor->page_index];
}
-static bool ceph_msg_data_pages_advance(struct ceph_msg_data *data,
+static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor *cursor,
size_t bytes)
{
- struct ceph_msg_data_cursor *cursor = data->cursor;
-
- BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
+ BUG_ON(cursor->data->type != CEPH_MSG_DATA_PAGES);
BUG_ON(cursor->page_offset + bytes > PAGE_SIZE);
@@ -894,10 +892,11 @@
* For a pagelist, a piece is whatever remains to be consumed in the
* first page in the list, or the front of the next page.
*/
-static void ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data *data,
+static void
+ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor *cursor,
size_t length)
{
- struct ceph_msg_data_cursor *cursor = data->cursor;
+ struct ceph_msg_data *data = cursor->data;
struct ceph_pagelist *pagelist;
struct page *page;
@@ -919,11 +918,11 @@
cursor->last_piece = length <= PAGE_SIZE;
}
-static struct page *ceph_msg_data_pagelist_next(struct ceph_msg_data *data,
- size_t *page_offset,
- size_t *length)
+static struct page *
+ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor *cursor,
+ size_t *page_offset, size_t *length)
{
- struct ceph_msg_data_cursor *cursor = data->cursor;
+ struct ceph_msg_data *data = cursor->data;
struct ceph_pagelist *pagelist;
BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
@@ -941,13 +940,13 @@
else
*length = PAGE_SIZE - *page_offset;
- return data->cursor->page;
+ return cursor->page;
}
-static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data *data,
+static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor *cursor,
size_t bytes)
{
- struct ceph_msg_data_cursor *cursor = data->cursor;
+ struct ceph_msg_data *data = cursor->data;
struct ceph_pagelist *pagelist;
BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
@@ -983,19 +982,21 @@
* be processed in that piece. It also tracks whether the current
* piece is the last one in the data item.
*/
-static void ceph_msg_data_cursor_init(struct ceph_msg_data *data,
- size_t length)
+static void ceph_msg_data_cursor_init(struct ceph_msg *msg, size_t length)
{
- switch (data->type) {
+ struct ceph_msg_data_cursor *cursor = &msg->cursor;
+
+ cursor->data = msg->data;
+ switch (cursor->data->type) {
case CEPH_MSG_DATA_PAGELIST:
- ceph_msg_data_pagelist_cursor_init(data, length);
+ ceph_msg_data_pagelist_cursor_init(cursor, length);
break;
case CEPH_MSG_DATA_PAGES:
- ceph_msg_data_pages_cursor_init(data, length);
+ ceph_msg_data_pages_cursor_init(cursor, length);
break;
#ifdef CONFIG_BLOCK
case CEPH_MSG_DATA_BIO:
- ceph_msg_data_bio_cursor_init(data, length);
+ ceph_msg_data_bio_cursor_init(cursor, length);
break;
#endif /* CONFIG_BLOCK */
case CEPH_MSG_DATA_NONE:
@@ -1003,7 +1004,7 @@
/* BUG(); */
break;
}
- data->cursor->need_crc = true;
+ cursor->need_crc = true;
}
/*
@@ -1011,23 +1012,22 @@
* data item, and supply the page offset and length of that piece.
* Indicate whether this is the last piece in this data item.
*/
-static struct page *ceph_msg_data_next(struct ceph_msg_data *data,
- size_t *page_offset,
- size_t *length,
+static struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor,
+ size_t *page_offset, size_t *length,
bool *last_piece)
{
struct page *page;
- switch (data->type) {
+ switch (cursor->data->type) {
case CEPH_MSG_DATA_PAGELIST:
- page = ceph_msg_data_pagelist_next(data, page_offset, length);
+ page = ceph_msg_data_pagelist_next(cursor, page_offset, length);
break;
case CEPH_MSG_DATA_PAGES:
- page = ceph_msg_data_pages_next(data, page_offset, length);
+ page = ceph_msg_data_pages_next(cursor, page_offset, length);
break;
#ifdef CONFIG_BLOCK
case CEPH_MSG_DATA_BIO:
- page = ceph_msg_data_bio_next(data, page_offset, length);
+ page = ceph_msg_data_bio_next(cursor, page_offset, length);
break;
#endif /* CONFIG_BLOCK */
case CEPH_MSG_DATA_NONE:
@@ -1039,7 +1039,7 @@
BUG_ON(*page_offset + *length > PAGE_SIZE);
BUG_ON(!*length);
if (last_piece)
- *last_piece = data->cursor->last_piece;
+ *last_piece = cursor->last_piece;
return page;
}
@@ -1048,22 +1048,22 @@
* Returns true if the result moves the cursor on to the next piece
* of the data item.
*/
-static bool ceph_msg_data_advance(struct ceph_msg_data *data, size_t bytes)
+static bool ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor,
+ size_t bytes)
{
- struct ceph_msg_data_cursor *cursor = data->cursor;
bool new_piece;
BUG_ON(bytes > cursor->resid);
- switch (data->type) {
+ switch (cursor->data->type) {
case CEPH_MSG_DATA_PAGELIST:
- new_piece = ceph_msg_data_pagelist_advance(data, bytes);
+ new_piece = ceph_msg_data_pagelist_advance(cursor, bytes);
break;
case CEPH_MSG_DATA_PAGES:
- new_piece = ceph_msg_data_pages_advance(data, bytes);
+ new_piece = ceph_msg_data_pages_advance(cursor, bytes);
break;
#ifdef CONFIG_BLOCK
case CEPH_MSG_DATA_BIO:
- new_piece = ceph_msg_data_bio_advance(data, bytes);
+ new_piece = ceph_msg_data_bio_advance(cursor, bytes);
break;
#endif /* CONFIG_BLOCK */
case CEPH_MSG_DATA_NONE:
@@ -1071,7 +1071,7 @@
BUG();
break;
}
- data->cursor->need_crc = new_piece;
+ cursor->need_crc = new_piece;
return new_piece;
}
@@ -1083,7 +1083,7 @@
/* Initialize data cursor */
- ceph_msg_data_cursor_init(msg->data, (size_t)data_len);
+ ceph_msg_data_cursor_init(msg, (size_t)data_len);
}
/*
@@ -1404,7 +1404,7 @@
static int write_partial_message_data(struct ceph_connection *con)
{
struct ceph_msg *msg = con->out_msg;
- struct ceph_msg_data_cursor *cursor = msg->data->cursor;
+ struct ceph_msg_data_cursor *cursor = &msg->cursor;
bool do_datacrc = !con->msgr->nocrc;
u32 crc;
@@ -1430,7 +1430,7 @@
bool need_crc;
int ret;
- page = ceph_msg_data_next(msg->data, &page_offset, &length,
+ page = ceph_msg_data_next(&msg->cursor, &page_offset, &length,
&last_piece);
ret = ceph_tcp_sendpage(con->sock, page, page_offset,
length, last_piece);
@@ -1442,7 +1442,7 @@
}
if (do_datacrc && cursor->need_crc)
crc = ceph_crc32c_page(crc, page, page_offset, length);
- need_crc = ceph_msg_data_advance(msg->data, (size_t)ret);
+ need_crc = ceph_msg_data_advance(&msg->cursor, (size_t)ret);
}
dout("%s %p msg %p done\n", __func__, con, msg);
@@ -2102,7 +2102,7 @@
static int read_partial_msg_data(struct ceph_connection *con)
{
struct ceph_msg *msg = con->in_msg;
- struct ceph_msg_data_cursor *cursor = msg->data->cursor;
+ struct ceph_msg_data_cursor *cursor = &msg->cursor;
const bool do_datacrc = !con->msgr->nocrc;
struct page *page;
size_t page_offset;
@@ -2117,7 +2117,7 @@
if (do_datacrc)
crc = con->in_data_crc;
while (cursor->resid) {
- page = ceph_msg_data_next(msg->data, &page_offset, &length,
+ page = ceph_msg_data_next(&msg->cursor, &page_offset, &length,
NULL);
ret = ceph_tcp_recvpage(con->sock, page, page_offset, length);
if (ret <= 0) {
@@ -2129,7 +2129,7 @@
if (do_datacrc)
crc = ceph_crc32c_page(crc, page, page_offset, ret);
- (void) ceph_msg_data_advance(msg->data, (size_t)ret);
+ (void) ceph_msg_data_advance(&msg->cursor, (size_t)ret);
}
if (do_datacrc)
con->in_data_crc = crc;
@@ -2991,7 +2991,6 @@
data = ceph_msg_data_create(CEPH_MSG_DATA_PAGES);
BUG_ON(!data);
- data->cursor = &msg->cursor;
data->pages = pages;
data->length = length;
data->alignment = alignment & ~PAGE_MASK;
@@ -3013,7 +3012,6 @@
data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST);
BUG_ON(!data);
- data->cursor = &msg->cursor;
data->pagelist = pagelist;
msg->data = data;
@@ -3033,7 +3031,6 @@
data = ceph_msg_data_create(CEPH_MSG_DATA_BIO);
BUG_ON(!data);
- data->cursor = &msg->cursor;
data->bio = bio;
data->bio_length = length;