From 466d1a4591c4e1bc3affd5c0cf3df5ad20338fb9 Mon Sep 17 00:00:00 2001 From: Kurt Hackel Date: Mon, 1 May 2006 11:11:13 -0700 Subject: [PATCH] ocfs2: make dlm recovery finalization 2 stage Makes it easier for the recovery process to deal with node death. Signed-off-by: Kurt Hackel Signed-off-by: Mark Fasheh --- fs/ocfs2/dlm/dlmcommon.h | 6 +- fs/ocfs2/dlm/dlmrecovery.c | 112 +++++++++++++++++++++++++++++++------ 2 files changed, 99 insertions(+), 19 deletions(-) diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h index 9e052445b0b5..78eccd0951e4 100644 --- a/fs/ocfs2/dlm/dlmcommon.h +++ b/fs/ocfs2/dlm/dlmcommon.h @@ -71,7 +71,8 @@ static inline int dlm_is_recovery_lock(const char *lock_name, int name_len) return 0; } -#define DLM_RECO_STATE_ACTIVE 0x0001 +#define DLM_RECO_STATE_ACTIVE 0x0001 +#define DLM_RECO_STATE_FINALIZE 0x0002 struct dlm_recovery_ctxt { @@ -633,7 +634,8 @@ struct dlm_finalize_reco { u8 node_idx; u8 dead_node; - __be16 pad1; + u8 flags; + u8 pad1; __be32 pad2; }; diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c index 6ee8b3247129..19123ce8b306 100644 --- a/fs/ocfs2/dlm/dlmrecovery.c +++ b/fs/ocfs2/dlm/dlmrecovery.c @@ -134,12 +134,18 @@ static inline void dlm_set_reco_master(struct dlm_ctxt *dlm, dlm->reco.new_master = master; } -static inline void dlm_reset_recovery(struct dlm_ctxt *dlm) +static inline void __dlm_reset_recovery(struct dlm_ctxt *dlm) { - spin_lock(&dlm->spinlock); + assert_spin_locked(&dlm->spinlock); clear_bit(dlm->reco.dead_node, dlm->recovery_map); dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM); dlm_set_reco_master(dlm, O2NM_INVALID_NODE_NUM); +} + +static inline void dlm_reset_recovery(struct dlm_ctxt *dlm) +{ + spin_lock(&dlm->spinlock); + __dlm_reset_recovery(dlm); spin_unlock(&dlm->spinlock); } @@ -2074,6 +2080,20 @@ static void __dlm_hb_node_down(struct dlm_ctxt *dlm, int idx) { assert_spin_locked(&dlm->spinlock); + if (dlm->reco.new_master == idx) { + mlog(0, "%s: recovery master %d just died\n", + dlm->name, idx); + if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) { + /* finalize1 was reached, so it is safe to clear + * the new_master and dead_node. that recovery + * is complete. */ + mlog(0, "%s: dead master %d had reached " + "finalize1 state, clearing\n", dlm->name, idx); + dlm->reco.state &= ~DLM_RECO_STATE_FINALIZE; + __dlm_reset_recovery(dlm); + } + } + /* check to see if the node is already considered dead */ if (!test_bit(idx, dlm->live_nodes_map)) { mlog(0, "for domain %s, node %d is already dead. " @@ -2364,6 +2384,14 @@ retry: * another ENOMEM */ msleep(100); goto retry; + } else if (ret == EAGAIN) { + mlog(0, "%s: trying to start recovery of node " + "%u, but node %u is waiting for last recovery " + "to complete, backoff for a bit\n", dlm->name, + dead_node, nodenum); + /* TODO Look into replacing msleep with cond_resched() */ + msleep(100); + goto retry; } } @@ -2379,6 +2407,17 @@ int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data) if (!dlm_grab(dlm)) return 0; + spin_lock(&dlm->spinlock); + if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) { + mlog(0, "%s: node %u wants to recover node %u (%u:%u) " + "but this node is in finalize state, waiting on finalize2\n", + dlm->name, br->node_idx, br->dead_node, + dlm->reco.dead_node, dlm->reco.new_master); + spin_unlock(&dlm->spinlock); + return EAGAIN; + } + spin_unlock(&dlm->spinlock); + mlog(0, "%s: node %u wants to recover node %u (%u:%u)\n", dlm->name, br->node_idx, br->dead_node, dlm->reco.dead_node, dlm->reco.new_master); @@ -2432,6 +2471,7 @@ int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data) return 0; } +#define DLM_FINALIZE_STAGE2 0x01 static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm) { int ret = 0; @@ -2439,25 +2479,31 @@ static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm) struct dlm_node_iter iter; int nodenum; int status; + int stage = 1; - mlog(0, "finishing recovery for node %s:%u\n", - dlm->name, dlm->reco.dead_node); + mlog(0, "finishing recovery for node %s:%u, " + "stage %d\n", dlm->name, dlm->reco.dead_node, stage); spin_lock(&dlm->spinlock); dlm_node_iter_init(dlm->domain_map, &iter); spin_unlock(&dlm->spinlock); +stage2: memset(&fr, 0, sizeof(fr)); fr.node_idx = dlm->node_num; fr.dead_node = dlm->reco.dead_node; + if (stage == 2) + fr.flags |= DLM_FINALIZE_STAGE2; while ((nodenum = dlm_node_iter_next(&iter)) >= 0) { if (nodenum == dlm->node_num) continue; ret = o2net_send_message(DLM_FINALIZE_RECO_MSG, dlm->key, &fr, sizeof(fr), nodenum, &status); - if (ret >= 0) { + if (ret >= 0) ret = status; + if (ret < 0) { + mlog_errno(ret); if (dlm_is_host_down(ret)) { /* this has no effect on this recovery * session, so set the status to zero to @@ -2466,12 +2512,15 @@ static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm) "node finished recovery.\n", nodenum); ret = 0; } - } - if (ret < 0) { - mlog_errno(ret); break; } } + if (stage == 1) { + /* reset the node_iter back to the top and send finalize2 */ + iter.curnode = -1; + stage = 2; + goto stage2; + } return ret; } @@ -2480,15 +2529,19 @@ int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data) { struct dlm_ctxt *dlm = data; struct dlm_finalize_reco *fr = (struct dlm_finalize_reco *)msg->buf; + int stage = 1; /* ok to return 0, domain has gone away */ if (!dlm_grab(dlm)) return 0; - mlog(0, "%s: node %u finalizing recovery of node %u (%u:%u)\n", - dlm->name, fr->node_idx, fr->dead_node, - dlm->reco.dead_node, dlm->reco.new_master); + if (fr->flags & DLM_FINALIZE_STAGE2) + stage = 2; + mlog(0, "%s: node %u finalizing recovery stage%d of " + "node %u (%u:%u)\n", dlm->name, fr->node_idx, stage, + fr->dead_node, dlm->reco.dead_node, dlm->reco.new_master); + spin_lock(&dlm->spinlock); if (dlm->reco.new_master != fr->node_idx) { @@ -2504,13 +2557,38 @@ int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data) BUG(); } - dlm_finish_local_lockres_recovery(dlm, fr->dead_node, fr->node_idx); - - spin_unlock(&dlm->spinlock); - - dlm_reset_recovery(dlm); + switch (stage) { + case 1: + dlm_finish_local_lockres_recovery(dlm, fr->dead_node, fr->node_idx); + if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) { + mlog(ML_ERROR, "%s: received finalize1 from " + "new master %u for dead node %u, but " + "this node has already received it!\n", + dlm->name, fr->node_idx, fr->dead_node); + dlm_print_reco_node_status(dlm); + BUG(); + } + dlm->reco.state |= DLM_RECO_STATE_FINALIZE; + spin_unlock(&dlm->spinlock); + break; + case 2: + if (!(dlm->reco.state & DLM_RECO_STATE_FINALIZE)) { + mlog(ML_ERROR, "%s: received finalize2 from " + "new master %u for dead node %u, but " + "this node did not have finalize1!\n", + dlm->name, fr->node_idx, fr->dead_node); + dlm_print_reco_node_status(dlm); + BUG(); + } + dlm->reco.state &= ~DLM_RECO_STATE_FINALIZE; + spin_unlock(&dlm->spinlock); + dlm_reset_recovery(dlm); + dlm_kick_recovery_thread(dlm); + break; + default: + BUG(); + } - dlm_kick_recovery_thread(dlm); mlog(0, "%s: recovery done, reco master was %u, dead now %u, master now %u\n", dlm->name, fr->node_idx, dlm->reco.dead_node, dlm->reco.new_master); -- 2.39.5