cregit-Linux how code gets into the kernel

Release 4.10 fs/dlm/member.c

Directory: fs/dlm
/******************************************************************************
*******************************************************************************
**
**  Copyright (C) 2005-2011 Red Hat, Inc.  All rights reserved.
**
**  This copyrighted material is made available to anyone wishing to use,
**  modify, copy, or redistribute it subject to the terms and conditions
**  of the GNU General Public License v.2.
**
*******************************************************************************
******************************************************************************/

#include "dlm_internal.h"
#include "lockspace.h"
#include "member.h"
#include "recoverd.h"
#include "recover.h"
#include "rcom.h"
#include "config.h"
#include "lowcomms.h"


int dlm_slots_version(struct dlm_header *h) { if ((h->h_version & 0x0000FFFF) < DLM_HEADER_SLOTS) return 0; return 1; }

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david teiglanddavid teigland28100.00%1100.00%
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void dlm_slot_save(struct dlm_ls *ls, struct dlm_rcom *rc, struct dlm_member *memb) { struct rcom_config *rf = (struct rcom_config *)rc->rc_buf; if (!dlm_slots_version(&rc->rc_header)) return; memb->slot = le16_to_cpu(rf->rf_our_slot); memb->generation = le32_to_cpu(rf->rf_generation); }

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david teiglanddavid teigland68100.00%1100.00%
Total68100.00%1100.00%


void dlm_slots_copy_out(struct dlm_ls *ls, struct dlm_rcom *rc) { struct dlm_slot *slot; struct rcom_slot *ro; int i; ro = (struct rcom_slot *)(rc->rc_buf + sizeof(struct rcom_config)); /* ls_slots array is sparse, but not rcom_slots */ for (i = 0; i < ls->ls_slots_size; i++) { slot = &ls->ls_slots[i]; if (!slot->nodeid) continue; ro->ro_nodeid = cpu_to_le32(slot->nodeid); ro->ro_slot = cpu_to_le16(slot->slot); ro++; } }

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david teiglanddavid teigland108100.00%1100.00%
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#define SLOT_DEBUG_LINE 128
static void log_slots(struct dlm_ls *ls, uint32_t gen, int num_slots, struct rcom_slot *ro0, struct dlm_slot *array, int array_size) { char line[SLOT_DEBUG_LINE]; int len = SLOT_DEBUG_LINE - 1; int pos = 0; int ret, i; memset(line, 0, sizeof(line)); if (array) { for (i = 0; i < array_size; i++) { if (!array[i].nodeid) continue; ret = snprintf(line + pos, len - pos, " %d:%d", array[i].slot, array[i].nodeid); if (ret >= len - pos) break; pos += ret; } } else if (ro0) { for (i = 0; i < num_slots; i++) { ret = snprintf(line + pos, len - pos, " %d:%d", ro0[i].ro_slot, ro0[i].ro_nodeid); if (ret >= len - pos) break; pos += ret; } } log_rinfo(ls, "generation %u slots %d%s", gen, num_slots, line); }

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david teiglanddavid teigland216100.00%2100.00%
Total216100.00%2100.00%


int dlm_slots_copy_in(struct dlm_ls *ls) { struct dlm_member *memb; struct dlm_rcom *rc = ls->ls_recover_buf; struct rcom_config *rf = (struct rcom_config *)rc->rc_buf; struct rcom_slot *ro0, *ro; int our_nodeid = dlm_our_nodeid(); int i, num_slots; uint32_t gen; if (!dlm_slots_version(&rc->rc_header)) return -1; gen = le32_to_cpu(rf->rf_generation); if (gen <= ls->ls_generation) { log_error(ls, "dlm_slots_copy_in gen %u old %u", gen, ls->ls_generation); } ls->ls_generation = gen; num_slots = le16_to_cpu(rf->rf_num_slots); if (!num_slots) return -1; ro0 = (struct rcom_slot *)(rc->rc_buf + sizeof(struct rcom_config)); for (i = 0, ro = ro0; i < num_slots; i++, ro++) { ro->ro_nodeid = le32_to_cpu(ro->ro_nodeid); ro->ro_slot = le16_to_cpu(ro->ro_slot); } log_slots(ls, gen, num_slots, ro0, NULL, 0); list_for_each_entry(memb, &ls->ls_nodes, list) { for (i = 0, ro = ro0; i < num_slots; i++, ro++) { if (ro->ro_nodeid != memb->nodeid) continue; memb->slot = ro->ro_slot; memb->slot_prev = memb->slot; break; } if (memb->nodeid == our_nodeid) { if (ls->ls_slot && ls->ls_slot != memb->slot) { log_error(ls, "dlm_slots_copy_in our slot " "changed %d %d", ls->ls_slot, memb->slot); return -1; } if (!ls->ls_slot) ls->ls_slot = memb->slot; } if (!memb->slot) { log_error(ls, "dlm_slots_copy_in nodeid %d no slot", memb->nodeid); return -1; } } return 0; }

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david teiglanddavid teigland357100.00%2100.00%
Total357100.00%2100.00%

/* for any nodes that do not support slots, we will not have set memb->slot in wait_status_all(), so memb->slot will remain -1, and we will not assign slots or set ls_num_slots here */
int dlm_slots_assign(struct dlm_ls *ls, int *num_slots, int *slots_size, struct dlm_slot **slots_out, uint32_t *gen_out) { struct dlm_member *memb; struct dlm_slot *array; int our_nodeid = dlm_our_nodeid(); int array_size, max_slots, i; int need = 0; int max = 0; int num = 0; uint32_t gen = 0; /* our own memb struct will have slot -1 gen 0 */ list_for_each_entry(memb, &ls->ls_nodes, list) { if (memb->nodeid == our_nodeid) { memb->slot = ls->ls_slot; memb->generation = ls->ls_generation; break; } } list_for_each_entry(memb, &ls->ls_nodes, list) { if (memb->generation > gen) gen = memb->generation; /* node doesn't support slots */ if (memb->slot == -1) return -1; /* node needs a slot assigned */ if (!memb->slot) need++; /* node has a slot assigned */ num++; if (!max || max < memb->slot) max = memb->slot; /* sanity check, once slot is assigned it shouldn't change */ if (memb->slot_prev && memb->slot && memb->slot_prev != memb->slot) { log_error(ls, "nodeid %d slot changed %d %d", memb->nodeid, memb->slot_prev, memb->slot); return -1; } memb->slot_prev = memb->slot; } array_size = max + need; array = kzalloc(array_size * sizeof(struct dlm_slot), GFP_NOFS); if (!array) return -ENOMEM; num = 0; /* fill in slots (offsets) that are used */ list_for_each_entry(memb, &ls->ls_nodes, list) { if (!memb->slot) continue; if (memb->slot > array_size) { log_error(ls, "invalid slot number %d", memb->slot); kfree(array); return -1; } array[memb->slot - 1].nodeid = memb->nodeid; array[memb->slot - 1].slot = memb->slot; num++; } /* assign new slots from unused offsets */ list_for_each_entry(memb, &ls->ls_nodes, list) { if (memb->slot) continue; for (i = 0; i < array_size; i++) { if (array[i].nodeid) continue; memb->slot = i + 1; memb->slot_prev = memb->slot; array[i].nodeid = memb->nodeid; array[i].slot = memb->slot; num++; if (!ls->ls_slot && memb->nodeid == our_nodeid) ls->ls_slot = memb->slot; break; } if (!memb->slot) { log_error(ls, "no free slot found"); kfree(array); return -1; } } gen++; log_slots(ls, gen, num, NULL, array, array_size); max_slots = (dlm_config.ci_buffer_size - sizeof(struct dlm_rcom) - sizeof(struct rcom_config)) / sizeof(struct rcom_slot); if (num > max_slots) { log_error(ls, "num_slots %d exceeds max_slots %d", num, max_slots); kfree(array); return -1; } *gen_out = gen; *slots_out = array; *slots_size = array_size; *num_slots = num; return 0; }

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david teiglanddavid teigland573100.00%2100.00%
Total573100.00%2100.00%


static void add_ordered_member(struct dlm_ls *ls, struct dlm_member *new) { struct dlm_member *memb = NULL; struct list_head *tmp; struct list_head *newlist = &new->list; struct list_head *head = &ls->ls_nodes; list_for_each(tmp, head) { memb = list_entry(tmp, struct dlm_member, list); if (new->nodeid < memb->nodeid) break; } if (!memb) list_add_tail(newlist, head); else { /* FIXME: can use list macro here */ newlist->prev = tmp->prev; newlist->next = tmp; tmp->prev->next = newlist; tmp->prev = newlist; } }

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david teiglanddavid teigland123100.00%1100.00%
Total123100.00%1100.00%


static int dlm_add_member(struct dlm_ls *ls, struct dlm_config_node *node) { struct dlm_member *memb; int error; memb = kzalloc(sizeof(struct dlm_member), GFP_NOFS); if (!memb) return -ENOMEM; error = dlm_lowcomms_connect_node(node->nodeid); if (error < 0) { kfree(memb); return error; } memb->nodeid = node->nodeid; memb->weight = node->weight; memb->comm_seq = node->comm_seq; add_ordered_member(ls, memb); ls->ls_num_nodes++; return 0; }

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david teiglanddavid teigland8678.18%480.00%
christine caulfieldchristine caulfield2421.82%120.00%
Total110100.00%5100.00%


static struct dlm_member *find_memb(struct list_head *head, int nodeid) { struct dlm_member *memb; list_for_each_entry(memb, head, list) { if (memb->nodeid == nodeid) return memb; } return NULL; }

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david teiglanddavid teigland45100.00%2100.00%
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int dlm_is_member(struct dlm_ls *ls, int nodeid) { if (find_memb(&ls->ls_nodes, nodeid)) return 1; return 0; }

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david teiglanddavid teigland31100.00%2100.00%
Total31100.00%2100.00%


int dlm_is_removed(struct dlm_ls *ls, int nodeid) { if (find_memb(&ls->ls_nodes_gone, nodeid)) return 1; return 0; }

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david teiglanddavid teigland31100.00%3100.00%
Total31100.00%3100.00%


static void clear_memb_list(struct list_head *head) { struct dlm_member *memb; while (!list_empty(head)) { memb = list_entry(head->next, struct dlm_member, list); list_del(&memb->list); kfree(memb); } }

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david teiglanddavid teigland53100.00%1100.00%
Total53100.00%1100.00%


void dlm_clear_members(struct dlm_ls *ls) { clear_memb_list(&ls->ls_nodes); ls->ls_num_nodes = 0; }

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david teiglanddavid teigland24100.00%1100.00%
Total24100.00%1100.00%


void dlm_clear_members_gone(struct dlm_ls *ls) { clear_memb_list(&ls->ls_nodes_gone); }

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david teiglanddavid teigland18100.00%1100.00%
Total18100.00%1100.00%


static void make_member_array(struct dlm_ls *ls) { struct dlm_member *memb; int i, w, x = 0, total = 0, all_zero = 0, *array; kfree(ls->ls_node_array); ls->ls_node_array = NULL; list_for_each_entry(memb, &ls->ls_nodes, list) { if (memb->weight) total += memb->weight; } /* all nodes revert to weight of 1 if all have weight 0 */ if (!total) { total = ls->ls_num_nodes; all_zero = 1; } ls->ls_total_weight = total; array = kmalloc(sizeof(int) * total, GFP_NOFS); if (!array) return; list_for_each_entry(memb, &ls->ls_nodes, list) { if (!all_zero && !memb->weight) continue; if (all_zero) w = 1; else w = memb->weight; DLM_ASSERT(x < total, printk("total %d x %d\n", total, x);); for (i = 0; i < w; i++) array[x++] = memb->nodeid; } ls->ls_node_array = array; }

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david teiglanddavid teigland189100.00%2100.00%
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/* send a status request to all members just to establish comms connections */
static int ping_members(struct dlm_ls *ls) { struct dlm_member *memb; int error = 0; list_for_each_entry(memb, &ls->ls_nodes, list) { error = dlm_recovery_stopped(ls); if (error) break; error = dlm_rcom_status(ls, memb->nodeid, 0); if (error) break; } if (error) log_rinfo(ls, "ping_members aborted %d last nodeid %d", error, ls->ls_recover_nodeid); return error; }

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david teiglanddavid teigland81100.00%5100.00%
Total81100.00%5100.00%


static void dlm_lsop_recover_prep(struct dlm_ls *ls) { if (!ls->ls_ops || !ls->ls_ops->recover_prep) return; ls->ls_ops->recover_prep(ls->ls_ops_arg); }

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david teiglanddavid teigland37100.00%1100.00%
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static void dlm_lsop_recover_slot(struct dlm_ls *ls, struct dlm_member *memb) { struct dlm_slot slot; uint32_t seq; int error; if (!ls->ls_ops || !ls->ls_ops->recover_slot) return; /* if there is no comms connection with this node or the present comms connection is newer than the one when this member was added, then we consider the node to have failed (versus being removed due to dlm_release_lockspace) */ error = dlm_comm_seq(memb->nodeid, &seq); if (!error && seq == memb->comm_seq) return; slot.nodeid = memb->nodeid; slot.slot = memb->slot; ls->ls_ops->recover_slot(ls->ls_ops_arg, &slot); }

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david teiglanddavid teigland96100.00%1100.00%
Total96100.00%1100.00%


void dlm_lsop_recover_done(struct dlm_ls *ls) { struct dlm_member *memb; struct dlm_slot *slots; int i, num; if (!ls->ls_ops || !ls->ls_ops->recover_done) return; num = ls->ls_num_nodes; slots = kzalloc(num * sizeof(struct dlm_slot), GFP_KERNEL); if (!slots) return; i = 0; list_for_each_entry(memb, &ls->ls_nodes, list) { if (i == num) { log_error(ls, "dlm_lsop_recover_done bad num %d", num); goto out; } slots[i].nodeid = memb->nodeid; slots[i].slot = memb->slot; i++; } ls->ls_ops->recover_done(ls->ls_ops_arg, slots, num, ls->ls_slot, ls->ls_generation); out: kfree(slots); }

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david teiglanddavid teigland156100.00%1100.00%
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static struct dlm_config_node *find_config_node(struct dlm_recover *rv, int nodeid) { int i; for (i = 0; i < rv->nodes_count; i++) { if (rv->nodes[i].nodeid == nodeid) return &rv->nodes[i]; } return NULL; }

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david teiglanddavid teigland61100.00%4100.00%
Total61100.00%4100.00%


int dlm_recover_members(struct dlm_ls *ls, struct dlm_recover *rv, int *neg_out) { struct dlm_member *memb, *safe; struct dlm_config_node *node; int i, error, neg = 0, low = -1; /* previously removed members that we've not finished removing need to count as a negative change so the "neg" recovery steps will happen */ list_for_each_entry(memb, &ls->ls_nodes_gone, list) { log_rinfo(ls, "prev removed member %d", memb->nodeid); neg++; } /* move departed members from ls_nodes to ls_nodes_gone */ list_for_each_entry_safe(memb, safe, &ls->ls_nodes, list) { node = find_config_node(rv, memb->nodeid); if (node && !node->new) continue; if (!node) { log_rinfo(ls, "remove member %d", memb->nodeid); } else { /* removed and re-added */ log_rinfo(ls, "remove member %d comm_seq %u %u", memb->nodeid, memb->comm_seq, node->comm_seq); } neg++; list_move(&memb->list, &ls->ls_nodes_gone); ls->ls_num_nodes--; dlm_lsop_recover_slot(ls, memb); } /* add new members to ls_nodes */ for (i = 0; i < rv->nodes_count; i++) { node = &rv->nodes[i]; if (dlm_is_member(ls, node->nodeid)) continue; dlm_add_member(ls, node); log_rinfo(ls, "add member %d", node->nodeid); } list_for_each_entry(memb, &ls->ls_nodes, list) { if (low == -1 || memb->nodeid < low) low = memb->nodeid; } ls->ls_low_nodeid = low; make_member_array(ls); *neg_out = neg; error = ping_members(ls); if (!error || error == -EPROTO) { /* new_lockspace() may be waiting to know if the config is good or bad */ ls->ls_members_result = error; complete(&ls->ls_members_done); } log_rinfo(ls, "dlm_recover_members %d nodes", ls->ls_num_nodes); return error; }

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david teiglanddavid teigland325100.00%8100.00%
Total325100.00%8100.00%

/* Userspace guarantees that dlm_ls_stop() has completed on all nodes before dlm_ls_start() is called on any of them to start the new recovery. */
int dlm_ls_stop(struct dlm_ls *ls) { int new; /* * Prevent dlm_recv from being in the middle of something when we do * the stop. This includes ensuring dlm_recv isn't processing a * recovery message (rcom), while dlm_recoverd is aborting and * resetting things from an in-progress recovery. i.e. we want * dlm_recoverd to abort its recovery without worrying about dlm_recv * processing an rcom at the same time. Stopping dlm_recv also makes * it easy for dlm_receive_message() to check locking stopped and add a * message to the requestqueue without races. */ down_write(&ls->ls_recv_active); /* * Abort any recovery that's in progress (see RECOVER_STOP, * dlm_recovery_stopped()) and tell any other threads running in the * dlm to quit any processing (see RUNNING, dlm_locking_stopped()). */ spin_lock(&ls->ls_recover_lock); set_bit(LSFL_RECOVER_STOP, &ls->ls_flags); new = test_and_clear_bit(LSFL_RUNNING, &ls->ls_flags); ls->ls_recover_seq++; spin_unlock(&ls->ls_recover_lock); /* * Let dlm_recv run again, now any normal messages will be saved on the * requestqueue for later. */ up_write(&ls->ls_recv_active); /* * This in_recovery lock does two things: * 1) Keeps this function from returning until all threads are out * of locking routines and locking is truly stopped. * 2) Keeps any new requests from being processed until it's unlocked * when recovery is complete. */ if (new) { set_bit(LSFL_RECOVER_DOWN, &ls->ls_flags); wake_up_process(ls->ls_recoverd_task); wait_event(ls->ls_recover_lock_wait, test_bit(LSFL_RECOVER_LOCK, &ls->ls_flags)); } /* * The recoverd suspend/resume makes sure that dlm_recoverd (if * running) has noticed RECOVER_STOP above and quit processing the * previous recovery. */ dlm_recoverd_suspend(ls); spin_lock(&ls->ls_recover_lock); kfree(ls->ls_slots); ls->ls_slots = NULL; ls->ls_num_slots = 0; ls->ls_slots_size = 0; ls->ls_recover_status = 0; spin_unlock(&ls->ls_recover_lock); dlm_recoverd_resume(ls); if (!ls->ls_recover_begin) ls->ls_recover_begin = jiffies; dlm_lsop_recover_prep(ls); return 0; }

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david teiglanddavid teigland19499.49%685.71%
adam buchbinderadam buchbinder10.51%114.29%
Total195100.00%7100.00%


int dlm_ls_start(struct dlm_ls *ls) { struct dlm_recover *rv = NULL, *rv_old; struct dlm_config_node *nodes; int error, count; rv = kzalloc(sizeof(struct dlm_recover), GFP_NOFS); if (!rv) return -ENOMEM; error = dlm_config_nodes(ls->ls_name, &nodes, &count); if (error < 0) goto fail; spin_lock(&ls->ls_recover_lock); /* the lockspace needs to be stopped before it can be started */ if (!dlm_locking_stopped(ls)) { spin_unlock(&ls->ls_recover_lock); log_error(ls, "start ignored: lockspace running"); error = -EINVAL; goto fail; } rv->nodes = nodes; rv->nodes_count = count; rv->seq = ++ls->ls_recover_seq; rv_old = ls->ls_recover_args; ls->ls_recover_args = rv; spin_unlock(&ls->ls_recover_lock); if (rv_old) { log_error(ls, "unused recovery %llx %d", (unsigned long long)rv_old->seq, rv_old->nodes_count); kfree(rv_old->nodes); kfree(rv_old); } set_bit(LSFL_RECOVER_WORK, &ls->ls_flags); wake_up_process(ls->ls_recoverd_task); return 0; fail: kfree(rv); kfree(nodes); return error; }

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david teiglanddavid teigland232100.00%6100.00%
Total232100.00%6100.00%


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david teiglanddavid teigland316199.12%1588.24%
christine caulfieldchristine caulfield270.85%15.88%
adam buchbinderadam buchbinder10.03%15.88%
Total3189100.00%17100.00%
Directory: fs/dlm
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