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libceph: define ceph_osd_data_length() 

One more osd data helper, which returns the length of the
data item, regardless of its type.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-04-03 01:28:58 -05:00 committed by Sage Weil
parent c54d47bfad
commit 23c08a9cb2
1 changed files with 26 additions and 5 deletions
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31
net/ceph/osd_client.c
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@ -117,6 +117,25 @@ void ceph_osd_data_bio_init(struct ceph_osd_data *osd_data,
EXPORT_SYMBOL(ceph_osd_data_bio_init);
#endif /* CONFIG_BLOCK */
static u64 ceph_osd_data_length(struct ceph_osd_data *osd_data)
{
switch (osd_data->type) {
case CEPH_OSD_DATA_TYPE_NONE:
return 0;
case CEPH_OSD_DATA_TYPE_PAGES:
return osd_data->length;
case CEPH_OSD_DATA_TYPE_PAGELIST:
return (u64)osd_data->pagelist->length;
#ifdef CONFIG_BLOCK
case CEPH_OSD_DATA_TYPE_BIO:
return (u64)osd_data->bio_length;
#endif /* CONFIG_BLOCK */
default:
WARN(true, "unrecognized data type %d\n", (int)osd_data->type);
return 0;
}
}
static void ceph_osd_data_release(struct ceph_osd_data *osd_data)
{
if (osd_data->type != CEPH_OSD_DATA_TYPE_PAGES)
@ -1887,17 +1906,19 @@ bad:
static void ceph_osdc_msg_data_set(struct ceph_msg *msg,
struct ceph_osd_data *osd_data)
{
u64 length = ceph_osd_data_length(osd_data);
if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
BUG_ON(osd_data->length > (u64) SIZE_MAX);
if (osd_data->length)
BUG_ON(length > (u64) SIZE_MAX);
if (length)
ceph_msg_data_set_pages(msg, osd_data->pages,
osd_data->length, osd_data->alignment);
length, osd_data->alignment);
} else if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGELIST) {
BUG_ON(!osd_data->pagelist->length);
BUG_ON(!length);
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, osd_data->bio_length);
ceph_msg_data_set_bio(msg, osd_data->bio, length);
#endif
} else {
BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_NONE);