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libceph: move cursor into message 

A message will only be processing a single data item at a time, so
there's no need for each data item to have its own cursor.

Move the cursor embedded in the message data structure into the
message itself.  To minimize the impact, keep the data->cursor
field, but make it be a pointer to the cursor in the message.

Move the definition of ceph_msg_data above ceph_msg_data_cursor so
the cursor can point to the data without a forward definition rather
than vice-versa.

This and the upcoming patches are part of:
    http://tracker.ceph.com/issues/3761

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-03-14 14:09:06 -05:00 committed by Sage Weil
parent c851c49591
commit 36153ec9dd
2 changed files with 41 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
include/linux/ceph/messenger.h
View File

@ -88,6 +88,25 @@ static __inline__ bool ceph_msg_data_type_valid(enum ceph_msg_data_type type)
}
}
struct ceph_msg_data {
enum ceph_msg_data_type type;
union {
#ifdef CONFIG_BLOCK
struct {
struct bio *bio;
size_t bio_length;
};
#endif /* CONFIG_BLOCK */
struct {
struct page **pages; /* NOT OWNER. */
size_t length; /* total # bytes */
unsigned int alignment; /* first page */
};
struct ceph_pagelist *pagelist;
};
struct ceph_msg_data_cursor *cursor;
};
struct ceph_msg_data_cursor {
size_t resid; /* bytes not yet consumed */
bool last_piece; /* now at last piece of data item */
@ -112,25 +131,6 @@ struct ceph_msg_data_cursor {
};
};
struct ceph_msg_data {
enum ceph_msg_data_type type;
union {
#ifdef CONFIG_BLOCK
struct {
struct bio *bio;
size_t bio_length;
};
#endif /* CONFIG_BLOCK */
struct {
struct page **pages; /* NOT OWNER. */
size_t length; /* total # bytes */
unsigned int alignment; /* first page */
};
struct ceph_pagelist *pagelist;
};
struct ceph_msg_data_cursor cursor; /* pagelist only */
};
/*
* a single message. it contains a header (src, dest, message type, etc.),
* footer (crc values, mainly), a "front" message body, and possibly a
@ -142,8 +142,9 @@ struct ceph_msg {
struct kvec front; /* unaligned blobs of message */
struct ceph_buffer *middle;
size_t data_length;
struct ceph_msg_data *data; /* data payload */
size_t data_length;
struct ceph_msg_data *data;
struct ceph_msg_data_cursor cursor;
struct ceph_connection *con;
struct list_head list_head; /* links for connection lists */

35
net/ceph/messenger.c
View File

@ -725,7 +725,7 @@ static void con_out_kvec_add(struct ceph_connection *con,
static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data *data,
size_t length)
{
struct ceph_msg_data_cursor *cursor = &data->cursor;
struct ceph_msg_data_cursor *cursor = data->cursor;
struct bio *bio;
BUG_ON(data->type != CEPH_MSG_DATA_BIO);
@ -745,7 +745,7 @@ static struct page *ceph_msg_data_bio_next(struct ceph_msg_data *data,
size_t *page_offset,
size_t *length)
{
struct ceph_msg_data_cursor *cursor = &data->cursor;
struct ceph_msg_data_cursor *cursor = data->cursor;
struct bio *bio;
struct bio_vec *bio_vec;
unsigned int index;
@ -774,7 +774,7 @@ static struct page *ceph_msg_data_bio_next(struct ceph_msg_data *data,
static bool ceph_msg_data_bio_advance(struct ceph_msg_data *data, size_t bytes)
{
struct ceph_msg_data_cursor *cursor = &data->cursor;
struct ceph_msg_data_cursor *cursor = data->cursor;
struct bio *bio;
struct bio_vec *bio_vec;
unsigned int index;
@ -826,7 +826,7 @@ static bool ceph_msg_data_bio_advance(struct ceph_msg_data *data, size_t bytes)
static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data *data,
size_t length)
{
struct ceph_msg_data_cursor *cursor = &data->cursor;
struct ceph_msg_data_cursor *cursor = data->cursor;
int page_count;
BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
@ -849,7 +849,7 @@ static struct page *ceph_msg_data_pages_next(struct ceph_msg_data *data,
size_t *page_offset,
size_t *length)
{
struct ceph_msg_data_cursor *cursor = &data->cursor;
struct ceph_msg_data_cursor *cursor = data->cursor;
BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
@ -868,7 +868,7 @@ static struct page *ceph_msg_data_pages_next(struct ceph_msg_data *data,
static bool ceph_msg_data_pages_advance(struct ceph_msg_data *data,
size_t bytes)
{
struct ceph_msg_data_cursor *cursor = &data->cursor;
struct ceph_msg_data_cursor *cursor = data->cursor;
BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
@ -897,7 +897,7 @@ static bool ceph_msg_data_pages_advance(struct ceph_msg_data *data,
static void ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data *data,
size_t length)
{
struct ceph_msg_data_cursor *cursor = &data->cursor;
struct ceph_msg_data_cursor *cursor = data->cursor;
struct ceph_pagelist *pagelist;
struct page *page;
@ -923,7 +923,7 @@ static struct page *ceph_msg_data_pagelist_next(struct ceph_msg_data *data,
size_t *page_offset,
size_t *length)
{
struct ceph_msg_data_cursor *cursor = &data->cursor;
struct ceph_msg_data_cursor *cursor = data->cursor;
struct ceph_pagelist *pagelist;
BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
@ -941,13 +941,13 @@ static struct page *ceph_msg_data_pagelist_next(struct ceph_msg_data *data,
else
*length = PAGE_SIZE - *page_offset;
return data->cursor.page;
return data->cursor->page;
}
static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data *data,
size_t bytes)
{
struct ceph_msg_data_cursor *cursor = &data->cursor;
struct ceph_msg_data_cursor *cursor = data->cursor;
struct ceph_pagelist *pagelist;
BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
@ -1003,7 +1003,7 @@ static void ceph_msg_data_cursor_init(struct ceph_msg_data *data,
/* BUG(); */
break;
}
data->cursor.need_crc = true;
data->cursor->need_crc = true;
}
/*
@ -1039,7 +1039,7 @@ static struct page *ceph_msg_data_next(struct ceph_msg_data *data,
BUG_ON(*page_offset + *length > PAGE_SIZE);
BUG_ON(!*length);
if (last_piece)
*last_piece = data->cursor.last_piece;
*last_piece = data->cursor->last_piece;
return page;
}
@ -1050,7 +1050,7 @@ static struct page *ceph_msg_data_next(struct ceph_msg_data *data,
*/
static bool ceph_msg_data_advance(struct ceph_msg_data *data, size_t bytes)
{
struct ceph_msg_data_cursor *cursor = &data->cursor;
struct ceph_msg_data_cursor *cursor = data->cursor;
bool new_piece;
BUG_ON(bytes > cursor->resid);
@ -1071,7 +1071,7 @@ static bool ceph_msg_data_advance(struct ceph_msg_data *data, size_t bytes)
BUG();
break;
}
data->cursor.need_crc = new_piece;
data->cursor->need_crc = new_piece;
return new_piece;
}
@ -1404,7 +1404,7 @@ static u32 ceph_crc32c_page(u32 crc, struct page *page,
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->data->cursor;
bool do_datacrc = !con->msgr->nocrc;
u32 crc;
@ -2102,7 +2102,7 @@ static int read_partial_message_section(struct ceph_connection *con,
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->data->cursor;
const bool do_datacrc = !con->msgr->nocrc;
struct page *page;
size_t page_offset;
@ -2991,6 +2991,7 @@ void ceph_msg_data_set_pages(struct ceph_msg *msg, struct page **pages,
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;
@ -3012,6 +3013,7 @@ void ceph_msg_data_set_pagelist(struct ceph_msg *msg,
data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST);
BUG_ON(!data);
data->cursor = &msg->cursor;
data->pagelist = pagelist;
msg->data = data;
@ -3031,6 +3033,7 @@ void ceph_msg_data_set_bio(struct ceph_msg *msg, struct bio *bio,
data = ceph_msg_data_create(CEPH_MSG_DATA_BIO);
BUG_ON(!data);
data->cursor = &msg->cursor;
data->bio = bio;
data->bio_length = length;