v4.19.13 snapshot.
diff --git a/include/linux/ceph/mon_client.h b/include/linux/ceph/mon_client.h
new file mode 100644
index 0000000..3a4688a
--- /dev/null
+++ b/include/linux/ceph/mon_client.h
@@ -0,0 +1,152 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _FS_CEPH_MON_CLIENT_H
+#define _FS_CEPH_MON_CLIENT_H
+
+#include <linux/completion.h>
+#include <linux/kref.h>
+#include <linux/rbtree.h>
+
+#include <linux/ceph/messenger.h>
+
+struct ceph_client;
+struct ceph_mount_args;
+struct ceph_auth_client;
+
+/*
+ * The monitor map enumerates the set of all monitors.
+ */
+struct ceph_monmap {
+ struct ceph_fsid fsid;
+ u32 epoch;
+ u32 num_mon;
+ struct ceph_entity_inst mon_inst[0];
+};
+
+struct ceph_mon_client;
+struct ceph_mon_generic_request;
+
+
+/*
+ * Generic mechanism for resending monitor requests.
+ */
+typedef void (*ceph_monc_request_func_t)(struct ceph_mon_client *monc,
+ int newmon);
+
+/* a pending monitor request */
+struct ceph_mon_request {
+ struct ceph_mon_client *monc;
+ struct delayed_work delayed_work;
+ unsigned long delay;
+ 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;
+
+ 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 {
+ struct ceph_client *client;
+ struct ceph_monmap *monmap;
+
+ struct mutex mutex;
+ struct delayed_work delayed_work;
+
+ struct ceph_auth_client *auth;
+ struct ceph_msg *m_auth, *m_auth_reply, *m_subscribe, *m_subscribe_ack;
+ int pending_auth;
+
+ bool hunting;
+ int cur_mon; /* last monitor i contacted */
+ unsigned long sub_renew_after;
+ unsigned long sub_renew_sent;
+ struct ceph_connection con;
+
+ bool had_a_connection;
+ int hunt_mult; /* [1..CEPH_MONC_HUNT_MAX_MULT] */
+
+ /* pending generic requests */
+ struct rb_root generic_request_tree;
+ u64 last_tid;
+
+ /* subs, indexed with CEPH_SUB_* */
+ struct {
+ struct ceph_mon_subscribe_item item;
+ bool want;
+ u32 have; /* epoch */
+ } subs[4];
+ int fs_cluster_id; /* "mdsmap.<id>" sub */
+
+#ifdef CONFIG_DEBUG_FS
+ struct dentry *debugfs_file;
+#endif
+};
+
+extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
+extern int ceph_monmap_contains(struct ceph_monmap *m,
+ struct ceph_entity_addr *addr);
+
+extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
+extern void ceph_monc_stop(struct ceph_mon_client *monc);
+
+enum {
+ CEPH_SUB_MONMAP = 0,
+ CEPH_SUB_OSDMAP,
+ CEPH_SUB_FSMAP,
+ CEPH_SUB_MDSMAP,
+};
+
+extern const char *ceph_sub_str[];
+
+/*
+ * The model here is to indicate that we need a new map of at least
+ * epoch @epoch, and also call in when we receive a map. We will
+ * periodically rerequest the map from the monitor cluster until we
+ * get what we want.
+ */
+bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
+ bool continuous);
+void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch);
+void ceph_monc_renew_subs(struct ceph_mon_client *monc);
+
+extern int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
+ unsigned long timeout);
+
+int ceph_monc_do_statfs(struct ceph_mon_client *monc, u64 data_pool,
+ struct ceph_statfs *buf);
+
+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);
+
+int ceph_monc_blacklist_add(struct ceph_mon_client *monc,
+ struct ceph_entity_addr *client_addr);
+
+extern int ceph_monc_open_session(struct ceph_mon_client *monc);
+
+extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);
+
+#endif