drivers/md/dm-vdo/admin-state.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright 2023 Red Hat
   4  */
   5
   6 #ifndef VDO_ADMIN_STATE_H
   7 #define VDO_ADMIN_STATE_H
   8
   9 #include "completion.h"
  10 #include "types.h"
  11
  12 struct admin_state_code {
  13         const char *name;
  14         /* Normal operation, data_vios may be active */
  15         bool normal;
  16         /* I/O is draining, new requests should not start */
  17         bool draining;
  18         /* This is a startup time operation */
  19         bool loading;
  20         /* The next state will be quiescent */
  21         bool quiescing;
  22         /* The VDO is quiescent, there should be no I/O */
  23         bool quiescent;
  24         /* Whether an operation is in progress and so no other operation may be started */
  25         bool operating;
  26 };
  27
  28 extern const struct admin_state_code *VDO_ADMIN_STATE_NORMAL_OPERATION;
  29 extern const struct admin_state_code *VDO_ADMIN_STATE_OPERATING;
  30 extern const struct admin_state_code *VDO_ADMIN_STATE_FORMATTING;
  31 extern const struct admin_state_code *VDO_ADMIN_STATE_PRE_LOADING;
  32 extern const struct admin_state_code *VDO_ADMIN_STATE_PRE_LOADED;
  33 extern const struct admin_state_code *VDO_ADMIN_STATE_LOADING;
  34 extern const struct admin_state_code *VDO_ADMIN_STATE_LOADING_FOR_RECOVERY;
  35 extern const struct admin_state_code *VDO_ADMIN_STATE_LOADING_FOR_REBUILD;
  36 extern const struct admin_state_code *VDO_ADMIN_STATE_WAITING_FOR_RECOVERY;
  37 extern const struct admin_state_code *VDO_ADMIN_STATE_NEW;
  38 extern const struct admin_state_code *VDO_ADMIN_STATE_INITIALIZED;
  39 extern const struct admin_state_code *VDO_ADMIN_STATE_RECOVERING;
  40 extern const struct admin_state_code *VDO_ADMIN_STATE_REBUILDING;
  41 extern const struct admin_state_code *VDO_ADMIN_STATE_SAVING;
  42 extern const struct admin_state_code *VDO_ADMIN_STATE_SAVED;
  43 extern const struct admin_state_code *VDO_ADMIN_STATE_SCRUBBING;
  44 extern const struct admin_state_code *VDO_ADMIN_STATE_SAVE_FOR_SCRUBBING;
  45 extern const struct admin_state_code *VDO_ADMIN_STATE_STOPPING;
  46 extern const struct admin_state_code *VDO_ADMIN_STATE_STOPPED;
  47 extern const struct admin_state_code *VDO_ADMIN_STATE_SUSPENDING;
  48 extern const struct admin_state_code *VDO_ADMIN_STATE_SUSPENDED;
  49 extern const struct admin_state_code *VDO_ADMIN_STATE_SUSPENDED_OPERATION;
  50 extern const struct admin_state_code *VDO_ADMIN_STATE_RESUMING;
  51
  52 struct admin_state {
  53         const struct admin_state_code *current_state;
  54         /* The next administrative state (when the current operation finishes) */
  55         const struct admin_state_code *next_state;
  56         /* A completion waiting on a state change */
  57         struct vdo_completion *waiter;
  58         /* Whether an operation is being initiated */
  59         bool starting;
  60         /* Whether an operation has completed in the initiator */
  61         bool complete;
  62 };
  63
  64 /**
  65  * typedef vdo_admin_initiator_fn - A method to be called once an admin operation may be initiated.
  66  */
  67 typedef void (*vdo_admin_initiator_fn)(struct admin_state *state);
  68
  69 static inline const struct admin_state_code * __must_check
  70 vdo_get_admin_state_code(const struct admin_state *state)
  71 {
  72         return READ_ONCE(state->current_state);
  73 }
  74
  75 /**
  76  * vdo_set_admin_state_code() - Set the current admin state code.
  77  *
  78  * This function should be used primarily for initialization and by adminState internals. Most uses
  79  * should go through the operation interfaces.
  80  */
  81 static inline void vdo_set_admin_state_code(struct admin_state *state,
  82                                             const struct admin_state_code *code)
  83 {
  84         WRITE_ONCE(state->current_state, code);
  85 }
  86
  87 static inline bool __must_check vdo_is_state_normal(const struct admin_state *state)
  88 {
  89         return vdo_get_admin_state_code(state)->normal;
  90 }
  91
  92 static inline bool __must_check vdo_is_state_suspending(const struct admin_state *state)
  93 {
  94         return (vdo_get_admin_state_code(state) == VDO_ADMIN_STATE_SUSPENDING);
  95 }
  96
  97 static inline bool __must_check vdo_is_state_saving(const struct admin_state *state)
  98 {
  99         return (vdo_get_admin_state_code(state) == VDO_ADMIN_STATE_SAVING);
 100 }
 101
 102 static inline bool __must_check vdo_is_state_saved(const struct admin_state *state)
 103 {
 104         return (vdo_get_admin_state_code(state) == VDO_ADMIN_STATE_SAVED);
 105 }
 106
 107 static inline bool __must_check vdo_is_state_draining(const struct admin_state *state)
 108 {
 109         return vdo_get_admin_state_code(state)->draining;
 110 }
 111
 112 static inline bool __must_check vdo_is_state_loading(const struct admin_state *state)
 113 {
 114         return vdo_get_admin_state_code(state)->loading;
 115 }
 116
 117 static inline bool __must_check vdo_is_state_resuming(const struct admin_state *state)
 118 {
 119         return (vdo_get_admin_state_code(state) == VDO_ADMIN_STATE_RESUMING);
 120 }
 121
 122 static inline bool __must_check vdo_is_state_clean_load(const struct admin_state *state)
 123 {
 124         const struct admin_state_code *code = vdo_get_admin_state_code(state);
 125
 126         return ((code == VDO_ADMIN_STATE_FORMATTING) || (code == VDO_ADMIN_STATE_LOADING));
 127 }
 128
 129 static inline bool __must_check vdo_is_state_quiescing(const struct admin_state *state)
 130 {
 131         return vdo_get_admin_state_code(state)->quiescing;
 132 }
 133
 134 static inline bool __must_check vdo_is_state_quiescent(const struct admin_state *state)
 135 {
 136         return vdo_get_admin_state_code(state)->quiescent;
 137 }
 138
 139 bool __must_check vdo_assert_load_operation(const struct admin_state_code *operation,
 140                                             struct vdo_completion *waiter);
 141
 142 bool vdo_start_loading(struct admin_state *state,
 143                        const struct admin_state_code *operation,
 144                        struct vdo_completion *waiter, vdo_admin_initiator_fn initiator);
 145
 146 bool vdo_finish_loading(struct admin_state *state);
 147
 148 bool vdo_finish_loading_with_result(struct admin_state *state, int result);
 149
 150 bool vdo_start_resuming(struct admin_state *state,
 151                         const struct admin_state_code *operation,
 152                         struct vdo_completion *waiter, vdo_admin_initiator_fn initiator);
 153
 154 bool vdo_finish_resuming(struct admin_state *state);
 155
 156 bool vdo_finish_resuming_with_result(struct admin_state *state, int result);
 157
 158 int vdo_resume_if_quiescent(struct admin_state *state);
 159
 160 bool vdo_start_draining(struct admin_state *state,
 161                         const struct admin_state_code *operation,
 162                         struct vdo_completion *waiter, vdo_admin_initiator_fn initiator);
 163
 164 bool vdo_finish_draining(struct admin_state *state);
 165
 166 bool vdo_finish_draining_with_result(struct admin_state *state, int result);
 167
 168 int vdo_start_operation(struct admin_state *state,
 169                         const struct admin_state_code *operation);
 170
 171 int vdo_start_operation_with_waiter(struct admin_state *state,
 172                                     const struct admin_state_code *operation,
 173                                     struct vdo_completion *waiter,
 174                                     vdo_admin_initiator_fn initiator);
 175
 176 bool vdo_finish_operation(struct admin_state *state, int result);
 177
 178 #endif /* VDO_ADMIN_STATE_H */