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linux
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rcom.c
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/****************************************************************************** ******************************************************************************* ** ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. ** Copyright (C) 2005-2008 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 "lowcomms.h" #include "midcomms.h" #include "rcom.h" #include "recover.h" #include "dir.h" #include "config.h" #include "memory.h" #include "lock.h" #include "util.h" static int rcom_response(struct dlm_ls *ls) { return test_bit(LSFL_RCOM_READY, &ls->ls_flags); } static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len, struct dlm_rcom **rc_ret, struct dlm_mhandle **mh_ret) { struct dlm_rcom *rc; struct dlm_mhandle *mh; char *mb; int mb_len = sizeof(struct dlm_rcom) + len; mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, GFP_NOFS, &mb); if (!mh) { log_print("create_rcom to %d type %d len %d ENOBUFS", to_nodeid, type, len); return -ENOBUFS; } memset(mb, 0, mb_len); rc = (struct dlm_rcom *) mb; rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR); rc->rc_header.h_lockspace = ls->ls_global_id; rc->rc_header.h_nodeid = dlm_our_nodeid(); rc->rc_header.h_length = mb_len; rc->rc_header.h_cmd = DLM_RCOM; rc->rc_type = type; spin_lock(&ls->ls_recover_lock); rc->rc_seq = ls->ls_recover_seq; spin_unlock(&ls->ls_recover_lock); *mh_ret = mh; *rc_ret = rc; return 0; } static void send_rcom(struct dlm_ls *ls, struct dlm_mhandle *mh, struct dlm_rcom *rc) { dlm_rcom_out(rc); dlm_lowcomms_commit_buffer(mh); } static void set_rcom_status(struct dlm_ls *ls, struct rcom_status *rs, uint32_t flags) { rs->rs_flags = cpu_to_le32(flags); } /* When replying to a status request, a node also sends back its configuration values. The requesting node then checks that the remote node is configured the same way as itself. */ static void set_rcom_config(struct dlm_ls *ls, struct rcom_config *rf, uint32_t num_slots) { rf->rf_lvblen = cpu_to_le32(ls->ls_lvblen); rf->rf_lsflags = cpu_to_le32(ls->ls_exflags); rf->rf_our_slot = cpu_to_le16(ls->ls_slot); rf->rf_num_slots = cpu_to_le16(num_slots); rf->rf_generation = cpu_to_le32(ls->ls_generation); } static int check_rcom_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid) { struct rcom_config *rf = (struct rcom_config *) rc->rc_buf; if ((rc->rc_header.h_version & 0xFFFF0000) != DLM_HEADER_MAJOR) { log_error(ls, "version mismatch: %x nodeid %d: %x", DLM_HEADER_MAJOR | DLM_HEADER_MINOR, nodeid, rc->rc_header.h_version); return -EPROTO; } if (le32_to_cpu(rf->rf_lvblen) != ls->ls_lvblen || le32_to_cpu(rf->rf_lsflags) != ls->ls_exflags) { log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x", ls->ls_lvblen, ls->ls_exflags, nodeid, le32_to_cpu(rf->rf_lvblen), le32_to_cpu(rf->rf_lsflags)); return -EPROTO; } return 0; } static void allow_sync_reply(struct dlm_ls *ls, uint64_t *new_seq) { spin_lock(&ls->ls_rcom_spin); *new_seq = ++ls->ls_rcom_seq; set_bit(LSFL_RCOM_WAIT, &ls->ls_flags); spin_unlock(&ls->ls_rcom_spin); } static void disallow_sync_reply(struct dlm_ls *ls) { spin_lock(&ls->ls_rcom_spin); clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags); clear_bit(LSFL_RCOM_READY, &ls->ls_flags); spin_unlock(&ls->ls_rcom_spin); } /* * low nodeid gathers one slot value at a time from each node. * it sets need_slots=0, and saves rf_our_slot returned from each * rcom_config. * * other nodes gather all slot values at once from the low nodeid. * they set need_slots=1, and ignore the rf_our_slot returned from each * rcom_config. they use the rf_num_slots returned from the low * node's rcom_config. */ int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags) { struct dlm_rcom *rc; struct dlm_mhandle *mh; int error = 0; ls->ls_recover_nodeid = nodeid; if (nodeid == dlm_our_nodeid()) { rc = ls->ls_recover_buf; rc->rc_result = dlm_recover_status(ls); goto out; } error = create_rcom(ls, nodeid, DLM_RCOM_STATUS, sizeof(struct rcom_status), &rc, &mh); if (error) goto out; set_rcom_status(ls, (struct rcom_status *)rc->rc_buf, status_flags); allow_sync_reply(ls, &rc->rc_id); memset(ls->ls_recover_buf, 0, dlm_config.ci_buffer_size); send_rcom(ls, mh, rc); error = dlm_wait_function(ls, &rcom_response); disallow_sync_reply(ls); if (error) goto out; rc = ls->ls_recover_buf; if (rc->rc_result == -ESRCH) { /* we pretend the remote lockspace exists with 0 status */ log_debug(ls, "remote node %d not ready", nodeid); rc->rc_result = 0; error = 0; } else { error = check_rcom_config(ls, rc, nodeid); } /* the caller looks at rc_result for the remote recovery status */ out: return error; } static void receive_rcom_status(struct dlm_ls *ls, struct dlm_rcom *rc_in) { struct dlm_rcom *rc; struct dlm_mhandle *mh; struct rcom_status *rs; uint32_t status; int nodeid = rc_in->rc_header.h_nodeid; int len = sizeof(struct rcom_config); int num_slots = 0; int error; if (!dlm_slots_version(&rc_in->rc_header)) { status = dlm_recover_status(ls); goto do_create; } rs = (struct rcom_status *)rc_in->rc_buf; if (!(le32_to_cpu(rs->rs_flags) & DLM_RSF_NEED_SLOTS)) { status = dlm_recover_status(ls); goto do_create; } spin_lock(&ls->ls_recover_lock); status = ls->ls_recover_status; num_slots = ls->ls_num_slots; spin_unlock(&ls->ls_recover_lock); len += num_slots * sizeof(struct rcom_slot); do_create: error = create_rcom(ls, nodeid, DLM_RCOM_STATUS_REPLY, len, &rc, &mh); if (error) return; rc->rc_id = rc_in->rc_id; rc->rc_seq_reply = rc_in->rc_seq; rc->rc_result = status; set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, num_slots); if (!num_slots) goto do_send; spin_lock(&ls->ls_recover_lock); if (ls->ls_num_slots != num_slots) { spin_unlock(&ls->ls_recover_lock); log_debug(ls, "receive_rcom_status num_slots %d to %d", num_slots, ls->ls_num_slots); rc->rc_result = 0; set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, 0); goto do_send; } dlm_slots_copy_out(ls, rc); spin_unlock(&ls->ls_recover_lock); do_send: send_rcom(ls, mh, rc); } static void receive_sync_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in) { spin_lock(&ls->ls_rcom_spin); if (!test_bit(LSFL_RCOM_WAIT, &ls->ls_flags) || rc_in->rc_id != ls->ls_rcom_seq) { log_debug(ls, "reject reply %d from %d seq %llx expect %llx", rc_in->rc_type, rc_in->rc_header.h_nodeid, (unsigned long long)rc_in->rc_id, (unsigned long long)ls->ls_rcom_seq); goto out; } memcpy(ls->ls_recover_buf, rc_in, rc_in->rc_header.h_length); set_bit(LSFL_RCOM_READY, &ls->ls_flags); clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags); wake_up(&ls->ls_wait_general); out: spin_unlock(&ls->ls_rcom_spin); } int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len) { struct dlm_rcom *rc; struct dlm_mhandle *mh; int error = 0; ls->ls_recover_nodeid = nodeid; error = create_rcom(ls, nodeid, DLM_RCOM_NAMES, last_len, &rc, &mh); if (error) goto out; memcpy(rc->rc_buf, last_name, last_len); allow_sync_reply(ls, &rc->rc_id); memset(ls->ls_recover_buf, 0, dlm_config.ci_buffer_size); send_rcom(ls, mh, rc); error = dlm_wait_function(ls, &rcom_response); disallow_sync_reply(ls); out: return error; } static void receive_rcom_names(struct dlm_ls *ls, struct dlm_rcom *rc_in) { struct dlm_rcom *rc; struct dlm_mhandle *mh; int error, inlen, outlen, nodeid; nodeid = rc_in->rc_header.h_nodeid; inlen = rc_in->rc_header.h_length - sizeof(struct dlm_rcom); outlen = dlm_config.ci_buffer_size - sizeof(struct dlm_rcom); error = create_rcom(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen, &rc, &mh); if (error) return; rc->rc_id = rc_in->rc_id; rc->rc_seq_reply = rc_in->rc_seq; dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen, nodeid); send_rcom(ls, mh, rc); } int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid) { struct dlm_rcom *rc; struct dlm_mhandle *mh; struct dlm_ls *ls = r->res_ls; int error; error = create_rcom(ls, dir_nodeid, DLM_RCOM_LOOKUP, r->res_length, &rc, &mh); if (error) goto out; memcpy(rc->rc_buf, r->res_name, r->res_length); rc->rc_id = (unsigned long) r->res_id; send_rcom(ls, mh, rc); out: return error; } int dlm_send_rcom_lookup_dump(struct dlm_rsb *r, int to_nodeid) { struct dlm_rcom *rc; struct dlm_mhandle *mh; struct dlm_ls *ls = r->res_ls; int error; error = create_rcom(ls, to_nodeid, DLM_RCOM_LOOKUP, r->res_length, &rc, &mh); if (error) goto out; memcpy(rc->rc_buf, r->res_name, r->res_length); rc->rc_id = 0xFFFFFFFF; send_rcom(ls, mh, rc); out: return error; } static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in) { struct dlm_rcom *rc; struct dlm_mhandle *mh; int error, ret_nodeid, nodeid = rc_in->rc_header.h_nodeid; int len = rc_in->rc_header.h_length - sizeof(struct dlm_rcom); error = create_rcom(ls, nodeid, DLM_RCOM_LOOKUP_REPLY, 0, &rc, &mh); if (error) return; if (rc_in->rc_id == 0xFFFFFFFF) { log_error(ls, "receive_rcom_lookup dump from %d", nodeid); dlm_dump_rsb_name(ls, rc_in->rc_buf, len); return; } error = dlm_master_lookup(ls, nodeid, rc_in->rc_buf, len, DLM_LU_RECOVER_MASTER, &ret_nodeid, NULL); if (error) ret_nodeid = error; rc->rc_result = ret_nodeid; rc->rc_id = rc_in->rc_id; rc->rc_seq_reply = rc_in->rc_seq; send_rcom(ls, mh, rc); } static void receive_rcom_lookup_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in) { dlm_recover_master_reply(ls, rc_in); } static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb, struct rcom_lock *rl) { memset(rl, 0, sizeof(*rl)); rl->rl_ownpid = cpu_to_le32(lkb->lkb_ownpid); rl->rl_lkid = cpu_to_le32(lkb->lkb_id); rl->rl_exflags = cpu_to_le32(lkb->lkb_exflags); rl->rl_flags = cpu_to_le32(lkb->lkb_flags); rl->rl_lvbseq = cpu_to_le32(lkb->lkb_lvbseq); rl->rl_rqmode = lkb->lkb_rqmode; rl->rl_grmode = lkb->lkb_grmode; rl->rl_status = lkb->lkb_status; rl->rl_wait_type = cpu_to_le16(lkb->lkb_wait_type); if (lkb->lkb_bastfn) rl->rl_asts |= DLM_CB_BAST; if (lkb->lkb_astfn) rl->rl_asts |= DLM_CB_CAST; rl->rl_namelen = cpu_to_le16(r->res_length); memcpy(rl->rl_name, r->res_name, r->res_length); /* FIXME: might we have an lvb without DLM_LKF_VALBLK set ? If so, receive_rcom_lock_args() won't take this copy. */ if (lkb->lkb_lvbptr) memcpy(rl->rl_lvb, lkb->lkb_lvbptr, r->res_ls->ls_lvblen); } int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) { struct dlm_ls *ls = r->res_ls; struct dlm_rcom *rc; struct dlm_mhandle *mh; struct rcom_lock *rl; int error, len = sizeof(struct rcom_lock); if (lkb->lkb_lvbptr) len += ls->ls_lvblen; error = create_rcom(ls, r->res_nodeid, DLM_RCOM_LOCK, len, &rc, &mh); if (error) goto out; rl = (struct rcom_lock *) rc->rc_buf; pack_rcom_lock(r, lkb, rl); rc->rc_id = (unsigned long) r; send_rcom(ls, mh, rc); out: return error; } /* needs at least dlm_rcom + rcom_lock */ static void receive_rcom_lock(struct dlm_ls *ls, struct dlm_rcom *rc_in) { struct dlm_rcom *rc; struct dlm_mhandle *mh; int error, nodeid = rc_in->rc_header.h_nodeid; dlm_recover_master_copy(ls, rc_in); error = create_rcom(ls, nodeid, DLM_RCOM_LOCK_REPLY, sizeof(struct rcom_lock), &rc, &mh); if (error) return; /* We send back the same rcom_lock struct we received, but dlm_recover_master_copy() has filled in rl_remid and rl_result */ memcpy(rc->rc_buf, rc_in->rc_buf, sizeof(struct rcom_lock)); rc->rc_id = rc_in->rc_id; rc->rc_seq_reply = rc_in->rc_seq; send_rcom(ls, mh, rc); } /* If the lockspace doesn't exist then still send a status message back; it's possible that it just doesn't have its global_id yet. */ int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in) { struct dlm_rcom *rc; struct rcom_config *rf; struct dlm_mhandle *mh; char *mb; int mb_len = sizeof(struct dlm_rcom) + sizeof(struct rcom_config); mh = dlm_lowcomms_get_buffer(nodeid, mb_len, GFP_NOFS, &mb); if (!mh) return -ENOBUFS; memset(mb, 0, mb_len); rc = (struct dlm_rcom *) mb; rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR); rc->rc_header.h_lockspace = rc_in->rc_header.h_lockspace; rc->rc_header.h_nodeid = dlm_our_nodeid(); rc->rc_header.h_length = mb_len; rc->rc_header.h_cmd = DLM_RCOM; rc->rc_type = DLM_RCOM_STATUS_REPLY; rc->rc_id = rc_in->rc_id; rc->rc_seq_reply = rc_in->rc_seq; rc->rc_result = -ESRCH; rf = (struct rcom_config *) rc->rc_buf; rf->rf_lvblen = cpu_to_le32(~0U); dlm_rcom_out(rc); dlm_lowcomms_commit_buffer(mh); return 0; } /* * Ignore messages for stage Y before we set * recover_status bit for stage X: * * recover_status = 0 * * dlm_recover_members() * - send nothing * - recv nothing * - ignore NAMES, NAMES_REPLY * - ignore LOOKUP, LOOKUP_REPLY * - ignore LOCK, LOCK_REPLY * * recover_status |= NODES * * dlm_recover_members_wait() * * dlm_recover_directory() * - send NAMES * - recv NAMES_REPLY * - ignore LOOKUP, LOOKUP_REPLY * - ignore LOCK, LOCK_REPLY * * recover_status |= DIR * * dlm_recover_directory_wait() * * dlm_recover_masters() * - send LOOKUP * - recv LOOKUP_REPLY * * dlm_recover_locks() * - send LOCKS * - recv LOCKS_REPLY * * recover_status |= LOCKS * * dlm_recover_locks_wait() * * recover_status |= DONE */ /* Called by dlm_recv; corresponds to dlm_receive_message() but special recovery-only comms are sent through here. */ void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid) { int lock_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_lock); int stop, reply = 0, names = 0, lookup = 0, lock = 0; uint32_t status; uint64_t seq; switch (rc->rc_type) { case DLM_RCOM_STATUS_REPLY: reply = 1; break; case DLM_RCOM_NAMES: names = 1; break; case DLM_RCOM_NAMES_REPLY: names = 1; reply = 1; break; case DLM_RCOM_LOOKUP: lookup = 1; break; case DLM_RCOM_LOOKUP_REPLY: lookup = 1; reply = 1; break; case DLM_RCOM_LOCK: lock = 1; break; case DLM_RCOM_LOCK_REPLY: lock = 1; reply = 1; break; }; spin_lock(&ls->ls_recover_lock); status = ls->ls_recover_status; stop = test_bit(LSFL_RECOVER_STOP, &ls->ls_flags); seq = ls->ls_recover_seq; spin_unlock(&ls->ls_recover_lock); if (stop && (rc->rc_type != DLM_RCOM_STATUS)) goto ignore; if (reply && (rc->rc_seq_reply != seq)) goto ignore; if (!(status & DLM_RS_NODES) && (names || lookup || lock)) goto ignore; if (!(status & DLM_RS_DIR) && (lookup || lock)) goto ignore; switch (rc->rc_type) { case DLM_RCOM_STATUS: receive_rcom_status(ls, rc); break; case DLM_RCOM_NAMES: receive_rcom_names(ls, rc); break; case DLM_RCOM_LOOKUP: receive_rcom_lookup(ls, rc); break; case DLM_RCOM_LOCK: if (rc->rc_header.h_length < lock_size) goto Eshort; receive_rcom_lock(ls, rc); break; case DLM_RCOM_STATUS_REPLY: receive_sync_reply(ls, rc); break; case DLM_RCOM_NAMES_REPLY: receive_sync_reply(ls, rc); break; case DLM_RCOM_LOOKUP_REPLY: receive_rcom_lookup_reply(ls, rc); break; case DLM_RCOM_LOCK_REPLY: if (rc->rc_header.h_length < lock_size) goto Eshort; dlm_recover_process_copy(ls, rc); break; default: log_error(ls, "receive_rcom bad type %d", rc->rc_type); } return; ignore: log_limit(ls, "dlm_receive_rcom ignore msg %d " "from %d %llu %llu recover seq %llu sts %x gen %u", rc->rc_type, nodeid, (unsigned long long)rc->rc_seq, (unsigned long long)rc->rc_seq_reply, (unsigned long long)seq, status, ls->ls_generation); return; Eshort: log_error(ls, "recovery message %d from %d is too short", rc->rc_type, nodeid); }
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