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libceph: mon_get_version request infrastructure

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Add support for mon_get_version requests to libceph.  This reuses much
of the ceph_mon_generic_request infrastructure, with one exception.
Older OSDs don't set mon_get_version reply hdr->tid even if the
original request had a non-zero tid, which makes it impossible to
lookup ceph_mon_generic_request contexts by tid in get_generic_reply()
for such replies.  As a workaround, we allocate a reply message on the
reply path.  This can probably interfere with revoke, but I don't see
a better way.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Ilya Dryomov
2014-05-13 11:19:26 +04:00
committed by Yan, Zheng
parent 002b36ba5e
commit 513a8243d6
4 changed files with 128 additions and 8 deletions
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9
include/linux/ceph/mon_client.h
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@@ -40,9 +40,9 @@ struct ceph_mon_request {
};
/*
* ceph_mon_generic_request is being used for the statfs and poolop requests
* which are bening done a bit differently because we need to get data back
* to the caller
* ceph_mon_generic_request is being used for the statfs, poolop and
* mon_get_version requests which are being done a bit differently
* because we need to get data back to the caller
*/
struct ceph_mon_generic_request {
struct kref kref;
@@ -108,6 +108,9 @@ extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
struct ceph_statfs *buf);
extern int ceph_monc_do_get_version(struct ceph_mon_client *monc,
const char *what, u64 *newest);
extern int ceph_monc_open_session(struct ceph_mon_client *monc);
extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);