1 files changed, 152 insertions, 0 deletions
diff --git a/include/linux/ceph/mon_client.h b/include/linux/ceph/mon_client.h
new file mode 100644
index 000000000..b65896115
--- /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[];
+};
+
+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 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);
+extern void ceph_monc_reopen_session(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_blocklist_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