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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 <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov
2016-04-28 16:07:27 +02:00
parent b07d3c4bd7
commit d0b19705e9
3 changed files with 232 additions and 115 deletions
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include/linux/ceph/mon_client.h
+16 -3
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@@ -39,20 +39,31 @@ struct ceph_mon_request {
ceph_monc_request_func_t do_request;
};
typedef void (*ceph_monc_callback_t)(struct ceph_mon_generic_request *);
/*
* ceph_mon_generic_request is being used for the statfs 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 ceph_mon_client *monc;
struct kref kref;
u64 tid;
struct rb_node node;
int result;
void *buf;
struct completion completion;
ceph_monc_callback_t complete_cb;
u64 private_data; /* r_tid/linger_id */
struct ceph_msg *request; /* original request */
struct ceph_msg *reply; /* and reply */
union {
struct ceph_statfs *st;
u64 newest;
} u;
};
struct ceph_mon_client {
@@ -124,8 +135,10 @@ extern int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
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);
int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
u64 *newest);
int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
ceph_monc_callback_t cb, u64 private_data);
extern int ceph_monc_open_session(struct ceph_mon_client *monc);