1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _FS_CEPH_MON_CLIENT_H 3 #define _FS_CEPH_MON_CLIENT_H 4 5 #include <linux/completion.h> 6 #include <linux/kref.h> 7 #include <linux/rbtree.h> 8 9 #include <linux/ceph/messenger.h> 10 11 struct ceph_client; 12 struct ceph_mount_args; 13 struct ceph_auth_client; 14 15 /* 16 * The monitor map enumerates the set of all monitors. 17 */ 18 struct ceph_monmap { 19 struct ceph_fsid fsid; 20 u32 epoch; 21 u32 num_mon; 22 struct ceph_entity_inst mon_inst[0]; 23 }; 24 25 struct ceph_mon_client; 26 struct ceph_mon_generic_request; 27 28 29 /* 30 * Generic mechanism for resending monitor requests. 31 */ 32 typedef void (*ceph_monc_request_func_t)(struct ceph_mon_client *monc, 33 int newmon); 34 35 /* a pending monitor request */ 36 struct ceph_mon_request { 37 struct ceph_mon_client *monc; 38 struct delayed_work delayed_work; 39 unsigned long delay; 40 ceph_monc_request_func_t do_request; 41 }; 42 43 typedef void (*ceph_monc_callback_t)(struct ceph_mon_generic_request *); 44 45 /* 46 * ceph_mon_generic_request is being used for the statfs and 47 * mon_get_version requests which are being done a bit differently 48 * because we need to get data back to the caller 49 */ 50 struct ceph_mon_generic_request { 51 struct ceph_mon_client *monc; 52 struct kref kref; 53 u64 tid; 54 struct rb_node node; 55 int result; 56 57 struct completion completion; 58 ceph_monc_callback_t complete_cb; 59 u64 private_data; /* r_tid/linger_id */ 60 61 struct ceph_msg *request; /* original request */ 62 struct ceph_msg *reply; /* and reply */ 63 64 union { 65 struct ceph_statfs *st; 66 u64 newest; 67 } u; 68 }; 69 70 struct ceph_mon_client { 71 struct ceph_client *client; 72 struct ceph_monmap *monmap; 73 74 struct mutex mutex; 75 struct delayed_work delayed_work; 76 77 struct ceph_auth_client *auth; 78 struct ceph_msg *m_auth, *m_auth_reply, *m_subscribe, *m_subscribe_ack; 79 int pending_auth; 80 81 bool hunting; 82 int cur_mon; /* last monitor i contacted */ 83 unsigned long sub_renew_after; 84 unsigned long sub_renew_sent; 85 struct ceph_connection con; 86 87 bool had_a_connection; 88 int hunt_mult; /* [1..CEPH_MONC_HUNT_MAX_MULT] */ 89 90 /* pending generic requests */ 91 struct rb_root generic_request_tree; 92 u64 last_tid; 93 94 /* subs, indexed with CEPH_SUB_* */ 95 struct { 96 struct ceph_mon_subscribe_item item; 97 bool want; 98 u32 have; /* epoch */ 99 } subs[4]; 100 int fs_cluster_id; /* "mdsmap.<id>" sub */ 101 102 #ifdef CONFIG_DEBUG_FS 103 struct dentry *debugfs_file; 104 #endif 105 }; 106 107 extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end); 108 extern int ceph_monmap_contains(struct ceph_monmap *m, 109 struct ceph_entity_addr *addr); 110 111 extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl); 112 extern void ceph_monc_stop(struct ceph_mon_client *monc); 113 114 enum { 115 CEPH_SUB_MONMAP = 0, 116 CEPH_SUB_OSDMAP, 117 CEPH_SUB_FSMAP, 118 CEPH_SUB_MDSMAP, 119 }; 120 121 extern const char *ceph_sub_str[]; 122 123 /* 124 * The model here is to indicate that we need a new map of at least 125 * epoch @epoch, and also call in when we receive a map. We will 126 * periodically rerequest the map from the monitor cluster until we 127 * get what we want. 128 */ 129 bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch, 130 bool continuous); 131 void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch); 132 void ceph_monc_renew_subs(struct ceph_mon_client *monc); 133 134 extern int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch, 135 unsigned long timeout); 136 137 int ceph_monc_do_statfs(struct ceph_mon_client *monc, u64 data_pool, 138 struct ceph_statfs *buf); 139 140 int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what, 141 u64 *newest); 142 int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what, 143 ceph_monc_callback_t cb, u64 private_data); 144 145 int ceph_monc_blacklist_add(struct ceph_mon_client *monc, 146 struct ceph_entity_addr *client_addr); 147 148 extern int ceph_monc_open_session(struct ceph_mon_client *monc); 149 150 extern int ceph_monc_validate_auth(struct ceph_mon_client *monc); 151 152 #endif 153