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libceph: record message data length

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Keep track of the length of the data portion for a message in a
separate field in the ceph_msg structure.  This information has
been maintained in wire byte order in the message header, but
that's going to change soon.

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 fdce58ccb5
commit a193080481
3 changed files with 13 additions and 3 deletions
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include/linux/ceph/messenger.h
+3 -1
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@@ -139,6 +139,7 @@ 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 */
struct ceph_connection *con;
@@ -270,7 +271,8 @@ extern void ceph_msg_data_set_pages(struct ceph_msg *msg, struct page **pages,
size_t length, size_t alignment);
extern void ceph_msg_data_set_pagelist(struct ceph_msg *msg,
struct ceph_pagelist *pagelist);
extern void ceph_msg_data_set_bio(struct ceph_msg *msg, struct bio *bio);
extern void ceph_msg_data_set_bio(struct ceph_msg *msg, struct bio *bio,
size_t length);
extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
bool can_fail);