1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3 *******************************************************************************
5 ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
6 ** Copyright (C) 2004-2010 Red Hat, Inc. All rights reserved.
9 *******************************************************************************
10 ******************************************************************************/
12 #include <trace/events/dlm.h>
14 #include "dlm_internal.h"
15 #include "lvb_table.h"
21 static void dlm_run_callback(uint32_t ls_id, uint32_t lkb_id, int8_t mode,
22 uint32_t flags, uint8_t sb_flags, int sb_status,
23 struct dlm_lksb *lksb,
24 void (*astfn)(void *astparam),
25 void (*bastfn)(void *astparam, int mode),
26 void *astparam, const char *res_name,
29 if (flags & DLM_CB_BAST) {
30 trace_dlm_bast(ls_id, lkb_id, mode, res_name, res_length);
31 bastfn(astparam, mode);
32 } else if (flags & DLM_CB_CAST) {
33 trace_dlm_ast(ls_id, lkb_id, sb_status, sb_flags, res_name,
35 lksb->sb_status = sb_status;
36 lksb->sb_flags = sb_flags;
41 static void dlm_do_callback(struct dlm_callback *cb)
43 dlm_run_callback(cb->ls_id, cb->lkb_id, cb->mode, cb->flags,
44 cb->sb_flags, cb->sb_status, cb->lkb_lksb,
45 cb->astfn, cb->bastfn, cb->astparam,
46 cb->res_name, cb->res_length);
50 static void dlm_callback_work(struct work_struct *work)
52 struct dlm_callback *cb = container_of(work, struct dlm_callback, work);
57 bool dlm_may_skip_callback(struct dlm_lkb *lkb, uint32_t flags, int mode,
58 int status, uint32_t sbflags, int *copy_lvb)
60 struct dlm_rsb *rsb = lkb->lkb_resource;
61 struct dlm_ls *ls = rsb->res_ls;
67 if (flags & DLM_CB_BAST) {
68 /* if cb is a bast, it should be skipped if the blocking mode is
69 * compatible with the last granted mode
71 if (lkb->lkb_last_cast_cb_mode != -1) {
72 if (dlm_modes_compat(mode, lkb->lkb_last_cast_cb_mode)) {
73 log_debug(ls, "skip %x bast mode %d for cast mode %d",
75 lkb->lkb_last_cast_cb_mode);
81 * Suppress some redundant basts here, do more on removal.
82 * Don't even add a bast if the callback just before it
83 * is a bast for the same mode or a more restrictive mode.
84 * (the addional > PR check is needed for PR/CW inversion)
86 if (lkb->lkb_last_cb_mode != -1 &&
87 lkb->lkb_last_cb_flags & DLM_CB_BAST) {
88 prev_mode = lkb->lkb_last_cb_mode;
90 if ((prev_mode == mode) ||
91 (prev_mode > mode && prev_mode > DLM_LOCK_PR)) {
92 log_debug(ls, "skip %x add bast mode %d for bast mode %d",
93 lkb->lkb_id, mode, prev_mode);
98 lkb->lkb_last_bast_time = ktime_get();
99 lkb->lkb_last_bast_cb_mode = mode;
100 } else if (flags & DLM_CB_CAST) {
101 if (test_bit(DLM_DFL_USER_BIT, &lkb->lkb_dflags)) {
102 prev_mode = lkb->lkb_last_cast_cb_mode;
104 if (!status && lkb->lkb_lksb->sb_lvbptr &&
105 dlm_lvb_operations[prev_mode + 1][mode + 1]) {
111 lkb->lkb_last_cast_cb_mode = mode;
112 lkb->lkb_last_cast_time = ktime_get();
115 lkb->lkb_last_cb_mode = mode;
116 lkb->lkb_last_cb_flags = flags;
121 int dlm_get_cb(struct dlm_lkb *lkb, uint32_t flags, int mode,
122 int status, uint32_t sbflags,
123 struct dlm_callback **cb)
125 struct dlm_rsb *rsb = lkb->lkb_resource;
126 struct dlm_ls *ls = rsb->res_ls;
128 *cb = dlm_allocate_cb();
129 if (WARN_ON_ONCE(!*cb))
133 (*cb)->lkb_id = lkb->lkb_id;
134 (*cb)->ls_id = ls->ls_global_id;
135 memcpy((*cb)->res_name, rsb->res_name, rsb->res_length);
136 (*cb)->res_length = rsb->res_length;
138 (*cb)->flags = flags;
140 (*cb)->sb_status = status;
141 (*cb)->sb_flags = (sbflags & 0x000000FF);
142 (*cb)->lkb_lksb = lkb->lkb_lksb;
147 static int dlm_get_queue_cb(struct dlm_lkb *lkb, uint32_t flags, int mode,
148 int status, uint32_t sbflags,
149 struct dlm_callback **cb)
153 rv = dlm_get_cb(lkb, flags, mode, status, sbflags, cb);
157 (*cb)->astfn = lkb->lkb_astfn;
158 (*cb)->bastfn = lkb->lkb_bastfn;
159 (*cb)->astparam = lkb->lkb_astparam;
160 INIT_WORK(&(*cb)->work, dlm_callback_work);
165 void dlm_add_cb(struct dlm_lkb *lkb, uint32_t flags, int mode, int status,
168 struct dlm_rsb *rsb = lkb->lkb_resource;
169 struct dlm_ls *ls = rsb->res_ls;
170 struct dlm_callback *cb;
173 if (test_bit(DLM_DFL_USER_BIT, &lkb->lkb_dflags)) {
174 dlm_user_add_ast(lkb, flags, mode, status, sbflags);
178 if (dlm_may_skip_callback(lkb, flags, mode, status, sbflags, NULL))
181 spin_lock_bh(&ls->ls_cb_lock);
182 if (test_bit(LSFL_CB_DELAY, &ls->ls_flags)) {
183 rv = dlm_get_queue_cb(lkb, flags, mode, status, sbflags, &cb);
185 list_add(&cb->list, &ls->ls_cb_delay);
187 if (test_bit(LSFL_SOFTIRQ, &ls->ls_flags)) {
188 dlm_run_callback(ls->ls_global_id, lkb->lkb_id, mode, flags,
189 sbflags, status, lkb->lkb_lksb,
190 lkb->lkb_astfn, lkb->lkb_bastfn,
191 lkb->lkb_astparam, rsb->res_name,
194 rv = dlm_get_queue_cb(lkb, flags, mode, status, sbflags, &cb);
196 queue_work(ls->ls_callback_wq, &cb->work);
199 spin_unlock_bh(&ls->ls_cb_lock);
202 int dlm_callback_start(struct dlm_ls *ls)
204 if (!test_bit(LSFL_FS, &ls->ls_flags) ||
205 test_bit(LSFL_SOFTIRQ, &ls->ls_flags))
208 ls->ls_callback_wq = alloc_ordered_workqueue("dlm_callback",
209 WQ_HIGHPRI | WQ_MEM_RECLAIM);
210 if (!ls->ls_callback_wq) {
211 log_print("can't start dlm_callback workqueue");
217 void dlm_callback_stop(struct dlm_ls *ls)
219 if (ls->ls_callback_wq)
220 destroy_workqueue(ls->ls_callback_wq);
223 void dlm_callback_suspend(struct dlm_ls *ls)
225 if (!test_bit(LSFL_FS, &ls->ls_flags))
228 spin_lock_bh(&ls->ls_cb_lock);
229 set_bit(LSFL_CB_DELAY, &ls->ls_flags);
230 spin_unlock_bh(&ls->ls_cb_lock);
232 if (ls->ls_callback_wq)
233 flush_workqueue(ls->ls_callback_wq);
236 #define MAX_CB_QUEUE 25
238 void dlm_callback_resume(struct dlm_ls *ls)
240 struct dlm_callback *cb, *safe;
241 int count = 0, sum = 0;
244 if (!test_bit(LSFL_FS, &ls->ls_flags))
248 spin_lock_bh(&ls->ls_cb_lock);
249 list_for_each_entry_safe(cb, safe, &ls->ls_cb_delay, list) {
251 if (test_bit(LSFL_SOFTIRQ, &ls->ls_flags))
254 queue_work(ls->ls_callback_wq, &cb->work);
257 if (count == MAX_CB_QUEUE)
260 empty = list_empty(&ls->ls_cb_delay);
262 clear_bit(LSFL_CB_DELAY, &ls->ls_flags);
263 spin_unlock_bh(&ls->ls_cb_lock);
273 log_rinfo(ls, "%s %d", __func__, sum);