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libceph: async MON client generic requests

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For map check, we are going to need to send CEPH_MSG_MON_GET_VERSION
messages asynchronously and get a callback on completion.  Refactor MON
client to allow firing off generic requests asynchronously and add an
async variant of ceph_monc_get_version().  ceph_monc_do_statfs() is
switched over and remains sync.

Signed-off-by: Ilya Dryomov <[email protected]>
This commit is contained in:
Ilya Dryomov 2016-04-28 16:07:27 +02:00
commit d0b19705e9
3 changed files with 228 additions and 111 deletions
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4
drivers/block/rbd.c
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@ -4896,8 +4896,8 @@ static int rbd_add_get_pool_id(struct rbd_client *rbdc, const char *pool_name)
again:
ret = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, pool_name);
if (ret == -ENOENT && tries++ < 1) {
ret = ceph_monc_do_get_version(&rbdc->client->monc, "osdmap",
&newest_epoch);
ret = ceph_monc_get_version(&rbdc->client->monc, "osdmap",
&newest_epoch);
if (ret < 0)
return ret;