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libceph: define ceph_msg_has_*() data macros 

Define and use macros ceph_msg_has_*() to determine whether to
operate on the pages, pagelist, bio, and trail fields of a message.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-03-01 18:00:16 -06:00 committed by Sage Weil
parent 35b6280899
commit 97fb1c7f66
2 changed files with 34 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/ceph/messenger.h
View File

@ -64,6 +64,13 @@ struct ceph_messenger {
u32 required_features;
};
#define ceph_msg_has_pages(m) ((m)->pages != NULL)
#define ceph_msg_has_pagelist(m) ((m)->pagelist != NULL)
#ifdef CONFIG_BLOCK
#define ceph_msg_has_bio(m) ((m)->bio != NULL)
#endif /* CONFIG_BLOCK */
#define ceph_msg_has_trail(m) ((m)->trail != NULL)
/*
* a single message. it contains a header (src, dest, message type, etc.),
* footer (crc values, mainly), a "front" message body, and possibly a

44
net/ceph/messenger.c
View File

@ -746,12 +746,12 @@ static void prepare_message_data(struct ceph_msg *msg,
/* initialize page iterator */
msg_pos->page = 0;
if (msg->pages)
if (ceph_msg_has_pages(msg))
msg_pos->page_pos = msg->page_alignment;
else
msg_pos->page_pos = 0;
#ifdef CONFIG_BLOCK
if (msg->bio)
if (ceph_msg_has_bio(msg))
init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg);
#endif
msg_pos->data_pos = 0;
@ -1052,14 +1052,16 @@ static void out_msg_pos_next(struct ceph_connection *con, struct page *page,
msg_pos->page_pos = 0;
msg_pos->page++;
msg_pos->did_page_crc = false;
if (in_trail)
if (in_trail) {
BUG_ON(!ceph_msg_has_trail(msg));
list_rotate_left(&msg->trail->head);
else if (msg->pagelist)
} else if (ceph_msg_has_pagelist(msg)) {
list_rotate_left(&msg->pagelist->head);
#ifdef CONFIG_BLOCK
else if (msg->bio)
} else if (ceph_msg_has_bio(msg)) {
iter_bio_next(&msg->bio_iter, &msg->bio_seg);
#endif
}
}
static void in_msg_pos_next(struct ceph_connection *con, size_t len,
@ -1114,8 +1116,13 @@ static int write_partial_message_data(struct ceph_connection *con)
int ret;
int total_max_write;
bool in_trail = false;
const size_t trail_len = (msg->trail ? msg->trail->length : 0);
const size_t trail_off = data_len - trail_len;
size_t trail_len = 0;
size_t trail_off = data_len;
if (ceph_msg_has_trail(msg)) {
trail_len = msg->trail->length;
trail_off -= trail_len;
}
dout("%s %p msg %p page %d offset %d\n", __func__,
con, msg, msg_pos->page, msg_pos->page_pos);
@ -1140,17 +1147,17 @@ static int write_partial_message_data(struct ceph_connection *con)
total_max_write = trail_off - msg_pos->data_pos;
if (in_trail) {
BUG_ON(!ceph_msg_has_trail(msg));
total_max_write = data_len - msg_pos->data_pos;
page = list_first_entry(&msg->trail->head,
struct page, lru);
} else if (msg->pages) {
} else if (ceph_msg_has_pages(msg)) {
page = msg->pages[msg_pos->page];
} else if (msg->pagelist) {
} else if (ceph_msg_has_pagelist(msg)) {
page = list_first_entry(&msg->pagelist->head,
struct page, lru);
#ifdef CONFIG_BLOCK
} else if (msg->bio) {
} else if (ceph_msg_has_bio(msg)) {
struct bio_vec *bv;
bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
@ -1908,13 +1915,13 @@ static int read_partial_msg_data(struct ceph_connection *con)
data_len = le32_to_cpu(con->in_hdr.data_len);
while (msg_pos->data_pos < data_len) {
if (msg->pages) {
if (ceph_msg_has_pages(msg)) {
ret = read_partial_message_pages(con, msg->pages,
data_len, do_datacrc);
if (ret <= 0)
return ret;
#ifdef CONFIG_BLOCK
} else if (msg->bio) {
} else if (ceph_msg_has_bio(msg)) {
ret = read_partial_message_bio(con,
data_len, do_datacrc);
if (ret <= 0)
@ -2946,16 +2953,19 @@ void ceph_msg_last_put(struct kref *kref)
ceph_buffer_put(m->middle);
m->middle = NULL;
}
m->length = 0;
m->pages = NULL;
if (ceph_msg_has_pages(m)) {
m->length = 0;
m->pages = NULL;
}
if (m->pagelist) {
if (ceph_msg_has_pagelist(m)) {
ceph_pagelist_release(m->pagelist);
kfree(m->pagelist);
m->pagelist = NULL;
}
m->trail = NULL;
if (ceph_msg_has_trail(m))
m->trail = NULL;
if (m->pool)
ceph_msgpool_put(m->pool, m);