27 static void nfs4_init_slot_table(struct nfs4_slot_table *tbl, const char *queue)  in nfs4_init_slot_table()  argument
29 	tbl->highest_used_slotid = NFS4_NO_SLOT;  in nfs4_init_slot_table()
30 	spin_lock_init(&tbl->slot_tbl_lock);  in nfs4_init_slot_table()
31 	rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, queue);  in nfs4_init_slot_table()
32 	init_waitqueue_head(&tbl->slot_waitq);  in nfs4_init_slot_table()
33 	init_completion(&tbl->complete);  in nfs4_init_slot_table()
39 static void nfs4_shrink_slot_table(struct nfs4_slot_table  *tbl, u32 newsize)  in nfs4_shrink_slot_table()  argument
42 	if (newsize >= tbl->max_slots)  in nfs4_shrink_slot_table()
45 	p = &tbl->slots;  in nfs4_shrink_slot_table()
53 		tbl->max_slots--;  in nfs4_shrink_slot_table()
62 void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl)  in nfs4_slot_tbl_drain_complete()  argument
64 	if (nfs4_slot_tbl_draining(tbl))  in nfs4_slot_tbl_drain_complete()
65 		complete(&tbl->complete);  in nfs4_slot_tbl_drain_complete()
83 void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot)  in nfs4_free_slot()  argument
88 	__clear_bit(slotid, tbl->used_slots);  in nfs4_free_slot()
91 	if (slotid == tbl->highest_used_slotid) {  in nfs4_free_slot()
92 		u32 new_max = find_last_bit(tbl->used_slots, slotid);  in nfs4_free_slot()
94 			tbl->highest_used_slotid = new_max;  in nfs4_free_slot()
96 			tbl->highest_used_slotid = NFS4_NO_SLOT;  in nfs4_free_slot()
97 			nfs4_slot_tbl_drain_complete(tbl);  in nfs4_free_slot()
101 		slotid, tbl->highest_used_slotid);  in nfs4_free_slot()
104 static struct nfs4_slot *nfs4_new_slot(struct nfs4_slot_table  *tbl,  in nfs4_new_slot()  argument
111 		slot->table = tbl;  in nfs4_new_slot()
120 static struct nfs4_slot *nfs4_find_or_create_slot(struct nfs4_slot_table  *tbl,  in nfs4_find_or_create_slot()  argument
125 	p = &tbl->slots;  in nfs4_find_or_create_slot()
128 			*p = nfs4_new_slot(tbl, tbl->max_slots,  in nfs4_find_or_create_slot()
132 			tbl->max_slots++;  in nfs4_find_or_create_slot()
142 static void nfs4_lock_slot(struct nfs4_slot_table *tbl,  in nfs4_lock_slot()  argument
147 	__set_bit(slotid, tbl->used_slots);  in nfs4_lock_slot()
148 	if (slotid > tbl->highest_used_slotid ||  in nfs4_lock_slot()
149 	    tbl->highest_used_slotid == NFS4_NO_SLOT)  in nfs4_lock_slot()
150 		tbl->highest_used_slotid = slotid;  in nfs4_lock_slot()
151 	slot->generation = tbl->generation;  in nfs4_lock_slot()
159 bool nfs4_try_to_lock_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot)  in nfs4_try_to_lock_slot()  argument
161 	if (nfs4_test_locked_slot(tbl, slot->slot_nr))  in nfs4_try_to_lock_slot()
163 	nfs4_lock_slot(tbl, slot);  in nfs4_try_to_lock_slot()
172 struct nfs4_slot *nfs4_lookup_slot(struct nfs4_slot_table *tbl, u32 slotid)  in nfs4_lookup_slot()  argument
174 	if (slotid <= tbl->max_slotid)  in nfs4_lookup_slot()
175 		return nfs4_find_or_create_slot(tbl, slotid, 0, GFP_NOWAIT);  in nfs4_lookup_slot()
179 static int nfs4_slot_get_seqid(struct nfs4_slot_table  *tbl, u32 slotid,  in nfs4_slot_get_seqid()  argument
181 	__must_hold(&tbl->slot_tbl_lock)  in nfs4_slot_get_seqid()
186 	slot = nfs4_lookup_slot(tbl, slotid);  in nfs4_slot_get_seqid()
201 static bool nfs4_slot_seqid_in_use(struct nfs4_slot_table *tbl,  in nfs4_slot_seqid_in_use()  argument
207 	spin_lock(&tbl->slot_tbl_lock);  in nfs4_slot_seqid_in_use()
208 	if (nfs4_slot_get_seqid(tbl, slotid, &cur_seq) == 0 &&  in nfs4_slot_seqid_in_use()
209 	    cur_seq == seq_nr && test_bit(slotid, tbl->used_slots))  in nfs4_slot_seqid_in_use()
211 	spin_unlock(&tbl->slot_tbl_lock);  in nfs4_slot_seqid_in_use()
222 int nfs4_slot_wait_on_seqid(struct nfs4_slot_table *tbl,  in nfs4_slot_wait_on_seqid()  argument
226 	if (wait_event_timeout(tbl->slot_waitq,  in nfs4_slot_wait_on_seqid()
227 			!nfs4_slot_seqid_in_use(tbl, slotid, seq_nr),  in nfs4_slot_wait_on_seqid()
242 struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl)  in nfs4_alloc_slot()  argument
248 		__func__, tbl->used_slots[0], tbl->highest_used_slotid,  in nfs4_alloc_slot()
249 		tbl->max_slotid + 1);  in nfs4_alloc_slot()
250 	slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slotid + 1);  in nfs4_alloc_slot()
251 	if (slotid <= tbl->max_slotid) {  in nfs4_alloc_slot()
252 		ret = nfs4_find_or_create_slot(tbl, slotid, 1, GFP_NOWAIT);  in nfs4_alloc_slot()
254 			nfs4_lock_slot(tbl, ret);  in nfs4_alloc_slot()
257 		__func__, tbl->used_slots[0], tbl->highest_used_slotid,  in nfs4_alloc_slot()
262 static int nfs4_grow_slot_table(struct nfs4_slot_table *tbl,  in nfs4_grow_slot_table()  argument
265 	if (max_reqs <= tbl->max_slots)  in nfs4_grow_slot_table()
267 	if (!IS_ERR(nfs4_find_or_create_slot(tbl, max_reqs - 1, ivalue, GFP_NOFS)))  in nfs4_grow_slot_table()
272 static void nfs4_reset_slot_table(struct nfs4_slot_table *tbl,  in nfs4_reset_slot_table()  argument
278 	nfs4_shrink_slot_table(tbl, server_highest_slotid + 1);  in nfs4_reset_slot_table()
279 	p = &tbl->slots;  in nfs4_reset_slot_table()
286 	tbl->highest_used_slotid = NFS4_NO_SLOT;  in nfs4_reset_slot_table()
287 	tbl->target_highest_slotid = server_highest_slotid;  in nfs4_reset_slot_table()
288 	tbl->server_highest_slotid = server_highest_slotid;  in nfs4_reset_slot_table()
289 	tbl->d_target_highest_slotid = 0;  in nfs4_reset_slot_table()
290 	tbl->d2_target_highest_slotid = 0;  in nfs4_reset_slot_table()
291 	tbl->max_slotid = server_highest_slotid;  in nfs4_reset_slot_table()
297 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl,  in nfs4_realloc_slot_table()  argument
303 		max_reqs, tbl->max_slots);  in nfs4_realloc_slot_table()
308 	ret = nfs4_grow_slot_table(tbl, max_reqs, ivalue);  in nfs4_realloc_slot_table()
312 	spin_lock(&tbl->slot_tbl_lock);  in nfs4_realloc_slot_table()
313 	nfs4_reset_slot_table(tbl, max_reqs - 1, ivalue);  in nfs4_realloc_slot_table()
314 	spin_unlock(&tbl->slot_tbl_lock);  in nfs4_realloc_slot_table()
317 		tbl, tbl->slots, tbl->max_slots);  in nfs4_realloc_slot_table()
326 static void nfs4_release_slot_table(struct nfs4_slot_table *tbl)  in nfs4_release_slot_table()  argument
328 	nfs4_shrink_slot_table(tbl, 0);  in nfs4_release_slot_table()
336 void nfs4_shutdown_slot_table(struct nfs4_slot_table *tbl)  in nfs4_shutdown_slot_table()  argument
338 	nfs4_release_slot_table(tbl);  in nfs4_shutdown_slot_table()
339 	rpc_destroy_wait_queue(&tbl->slot_tbl_waitq);  in nfs4_shutdown_slot_table()
350 int nfs4_setup_slot_table(struct nfs4_slot_table *tbl, unsigned int max_reqs,  in nfs4_setup_slot_table()  argument
353 	nfs4_init_slot_table(tbl, queue);  in nfs4_setup_slot_table()
354 	return nfs4_realloc_slot_table(tbl, max_reqs, 0);  in nfs4_setup_slot_table()
362 	struct nfs4_slot_table *tbl = slot->table;  in nfs41_assign_slot()  local
364 	if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)  in nfs41_assign_slot()
366 	slot->generation = tbl->generation;  in nfs41_assign_slot()
375 static bool __nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl,  in __nfs41_wake_and_assign_slot()  argument
378 	if (rpc_wake_up_first(&tbl->slot_tbl_waitq, nfs41_assign_slot, slot))  in __nfs41_wake_and_assign_slot()
383 bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl,  in nfs41_wake_and_assign_slot()  argument
386 	if (slot->slot_nr > tbl->max_slotid)  in nfs41_wake_and_assign_slot()
388 	return __nfs41_wake_and_assign_slot(tbl, slot);  in nfs41_wake_and_assign_slot()
391 static bool nfs41_try_wake_next_slot_table_entry(struct nfs4_slot_table *tbl)  in nfs41_try_wake_next_slot_table_entry()  argument
393 	struct nfs4_slot *slot = nfs4_alloc_slot(tbl);  in nfs41_try_wake_next_slot_table_entry()
395 		bool ret = __nfs41_wake_and_assign_slot(tbl, slot);  in nfs41_try_wake_next_slot_table_entry()
398 		nfs4_free_slot(tbl, slot);  in nfs41_try_wake_next_slot_table_entry()
403 void nfs41_wake_slot_table(struct nfs4_slot_table *tbl)  in nfs41_wake_slot_table()  argument
406 		if (!nfs41_try_wake_next_slot_table_entry(tbl))  in nfs41_wake_slot_table()
413 static void nfs41_set_max_slotid_locked(struct nfs4_slot_table *tbl,  in nfs41_set_max_slotid_locked()  argument
419 	if (max_slotid > tbl->server_highest_slotid)  in nfs41_set_max_slotid_locked()
420 		max_slotid = tbl->server_highest_slotid;  in nfs41_set_max_slotid_locked()
421 	if (max_slotid > tbl->target_highest_slotid)  in nfs41_set_max_slotid_locked()
422 		max_slotid = tbl->target_highest_slotid;  in nfs41_set_max_slotid_locked()
423 	tbl->max_slotid = max_slotid;  in nfs41_set_max_slotid_locked()
424 	nfs41_wake_slot_table(tbl);  in nfs41_set_max_slotid_locked()
428 static void nfs41_set_target_slotid_locked(struct nfs4_slot_table *tbl,  in nfs41_set_target_slotid_locked()  argument
431 	if (tbl->target_highest_slotid == target_highest_slotid)  in nfs41_set_target_slotid_locked()
433 	tbl->target_highest_slotid = target_highest_slotid;  in nfs41_set_target_slotid_locked()
434 	tbl->generation++;  in nfs41_set_target_slotid_locked()
437 void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,  in nfs41_set_target_slotid()  argument
440 	spin_lock(&tbl->slot_tbl_lock);  in nfs41_set_target_slotid()
441 	nfs41_set_target_slotid_locked(tbl, target_highest_slotid);  in nfs41_set_target_slotid()
442 	tbl->d_target_highest_slotid = 0;  in nfs41_set_target_slotid()
443 	tbl->d2_target_highest_slotid = 0;  in nfs41_set_target_slotid()
444 	nfs41_set_max_slotid_locked(tbl, target_highest_slotid);  in nfs41_set_target_slotid()
445 	spin_unlock(&tbl->slot_tbl_lock);  in nfs41_set_target_slotid()
448 static void nfs41_set_server_slotid_locked(struct nfs4_slot_table *tbl,  in nfs41_set_server_slotid_locked()  argument
451 	if (tbl->server_highest_slotid == highest_slotid)  in nfs41_set_server_slotid_locked()
453 	if (tbl->highest_used_slotid > highest_slotid)  in nfs41_set_server_slotid_locked()
456 	nfs4_shrink_slot_table(tbl, highest_slotid + 1);  in nfs41_set_server_slotid_locked()
457 	tbl->server_highest_slotid = highest_slotid;  in nfs41_set_server_slotid_locked()
489 static bool nfs41_is_outlier_target_slotid(struct nfs4_slot_table *tbl,  in nfs41_is_outlier_target_slotid()  argument
496 			tbl->target_highest_slotid);  in nfs41_is_outlier_target_slotid()
498 			tbl->d_target_highest_slotid);  in nfs41_is_outlier_target_slotid()
500 	if (nfs41_same_sign_or_zero_s32(d_target, tbl->d_target_highest_slotid))  in nfs41_is_outlier_target_slotid()
503 	if (nfs41_same_sign_or_zero_s32(d2_target, tbl->d2_target_highest_slotid))  in nfs41_is_outlier_target_slotid()
505 	tbl->d_target_highest_slotid = d_target;  in nfs41_is_outlier_target_slotid()
506 	tbl->d2_target_highest_slotid = d2_target;  in nfs41_is_outlier_target_slotid()
510 void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,  in nfs41_update_target_slotid()  argument
518 	spin_lock(&tbl->slot_tbl_lock);  in nfs41_update_target_slotid()
519 	if (!nfs41_is_outlier_target_slotid(tbl, target_highest_slotid))  in nfs41_update_target_slotid()
520 		nfs41_set_target_slotid_locked(tbl, target_highest_slotid);  in nfs41_update_target_slotid()
521 	if (tbl->generation == slot->generation)  in nfs41_update_target_slotid()
522 		nfs41_set_server_slotid_locked(tbl, highest_slotid);  in nfs41_update_target_slotid()
523 	nfs41_set_max_slotid_locked(tbl, target_highest_slotid);  in nfs41_update_target_slotid()
524 	spin_unlock(&tbl->slot_tbl_lock);  in nfs41_update_target_slotid()
538 	struct nfs4_slot_table *tbl;  in nfs4_setup_session_slot_tables()  local
543 	tbl = &ses->fc_slot_table;  in nfs4_setup_session_slot_tables()
544 	tbl->session = ses;  in nfs4_setup_session_slot_tables()
545 	status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);  in nfs4_setup_session_slot_tables()
549 	tbl = &ses->bc_slot_table;  in nfs4_setup_session_slot_tables()
550 	tbl->session = ses;  in nfs4_setup_session_slot_tables()
551 	status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);  in nfs4_setup_session_slot_tables()
552 	if (status && tbl->slots == NULL)  in nfs4_setup_session_slot_tables()