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libceph: record message data length 

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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4
include/linux/ceph/messenger.h
View File

@ -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);

10
net/ceph/messenger.c
View File

@ -2981,6 +2981,7 @@ void ceph_msg_data_set_pages(struct ceph_msg *msg, struct page **pages,
BUG_ON(!pages);
BUG_ON(!length);
BUG_ON(msg->data_length);
BUG_ON(msg->data != NULL);
data = ceph_msg_data_create(CEPH_MSG_DATA_PAGES);
@ -2990,6 +2991,7 @@ void ceph_msg_data_set_pages(struct ceph_msg *msg, struct page **pages,
data->alignment = alignment & ~PAGE_MASK;
msg->data = data;
msg->data_length = length;
}
EXPORT_SYMBOL(ceph_msg_data_set_pages);
@ -3000,6 +3002,7 @@ void ceph_msg_data_set_pagelist(struct ceph_msg *msg,
BUG_ON(!pagelist);
BUG_ON(!pagelist->length);
BUG_ON(msg->data_length);
BUG_ON(msg->data != NULL);
data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST);
@ -3007,14 +3010,17 @@ void ceph_msg_data_set_pagelist(struct ceph_msg *msg,
data->pagelist = pagelist;
msg->data = data;
msg->data_length = pagelist->length;
}
EXPORT_SYMBOL(ceph_msg_data_set_pagelist);
void ceph_msg_data_set_bio(struct ceph_msg *msg, struct bio *bio)
void ceph_msg_data_set_bio(struct ceph_msg *msg, struct bio *bio,
size_t length)
{
struct ceph_msg_data *data;
BUG_ON(!bio);
BUG_ON(msg->data_length);
BUG_ON(msg->data != NULL);
data = ceph_msg_data_create(CEPH_MSG_DATA_BIO);
@ -3022,6 +3028,7 @@ void ceph_msg_data_set_bio(struct ceph_msg *msg, struct bio *bio)
data->bio = bio;
msg->data = data;
msg->data_length = length;
}
EXPORT_SYMBOL(ceph_msg_data_set_bio);
@ -3200,6 +3207,7 @@ void ceph_msg_last_put(struct kref *kref)
}
ceph_msg_data_destroy(m->data);
m->data = NULL;
m->data_length = 0;
if (m->pool)
ceph_msgpool_put(m->pool, m);

2
net/ceph/osd_client.c
View File

@ -1848,7 +1848,7 @@ static void ceph_osdc_msg_data_set(struct ceph_msg *msg,
ceph_msg_data_set_pagelist(msg, osd_data->pagelist);
#ifdef CONFIG_BLOCK
} else if (osd_data->type == CEPH_OSD_DATA_TYPE_BIO) {
ceph_msg_data_set_bio(msg, osd_data->bio);
ceph_msg_data_set_bio(msg, osd_data->bio, osd_data->bio_length);
#endif
} else {
BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);