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642 lines
16 KiB
642 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/****************************************************************************** |
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******************************************************************************* |
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** |
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** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
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** Copyright (C) 2005-2008 Red Hat, Inc. All rights reserved. |
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** |
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** |
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******************************************************************************* |
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******************************************************************************/ |
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|
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#include "dlm_internal.h" |
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#include "lockspace.h" |
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#include "member.h" |
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#include "lowcomms.h" |
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#include "midcomms.h" |
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#include "rcom.h" |
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#include "recover.h" |
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#include "dir.h" |
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#include "config.h" |
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#include "memory.h" |
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#include "lock.h" |
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#include "util.h" |
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static int rcom_response(struct dlm_ls *ls) |
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{ |
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return test_bit(LSFL_RCOM_READY, &ls->ls_flags); |
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} |
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static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len, |
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struct dlm_rcom **rc_ret, struct dlm_mhandle **mh_ret) |
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{ |
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struct dlm_rcom *rc; |
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struct dlm_mhandle *mh; |
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char *mb; |
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int mb_len = sizeof(struct dlm_rcom) + len; |
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mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, GFP_NOFS, &mb); |
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if (!mh) { |
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log_print("create_rcom to %d type %d len %d ENOBUFS", |
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to_nodeid, type, len); |
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return -ENOBUFS; |
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} |
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memset(mb, 0, mb_len); |
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rc = (struct dlm_rcom *) mb; |
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rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR); |
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rc->rc_header.h_lockspace = ls->ls_global_id; |
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rc->rc_header.h_nodeid = dlm_our_nodeid(); |
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rc->rc_header.h_length = mb_len; |
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rc->rc_header.h_cmd = DLM_RCOM; |
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rc->rc_type = type; |
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spin_lock(&ls->ls_recover_lock); |
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rc->rc_seq = ls->ls_recover_seq; |
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spin_unlock(&ls->ls_recover_lock); |
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*mh_ret = mh; |
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*rc_ret = rc; |
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return 0; |
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} |
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static void send_rcom(struct dlm_ls *ls, struct dlm_mhandle *mh, |
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struct dlm_rcom *rc) |
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{ |
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dlm_rcom_out(rc); |
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dlm_lowcomms_commit_buffer(mh); |
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} |
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static void set_rcom_status(struct dlm_ls *ls, struct rcom_status *rs, |
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uint32_t flags) |
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{ |
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rs->rs_flags = cpu_to_le32(flags); |
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} |
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/* When replying to a status request, a node also sends back its |
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configuration values. The requesting node then checks that the remote |
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node is configured the same way as itself. */ |
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static void set_rcom_config(struct dlm_ls *ls, struct rcom_config *rf, |
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uint32_t num_slots) |
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{ |
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rf->rf_lvblen = cpu_to_le32(ls->ls_lvblen); |
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rf->rf_lsflags = cpu_to_le32(ls->ls_exflags); |
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rf->rf_our_slot = cpu_to_le16(ls->ls_slot); |
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rf->rf_num_slots = cpu_to_le16(num_slots); |
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rf->rf_generation = cpu_to_le32(ls->ls_generation); |
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} |
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static int check_rcom_config(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid) |
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{ |
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struct rcom_config *rf = (struct rcom_config *) rc->rc_buf; |
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if ((rc->rc_header.h_version & 0xFFFF0000) != DLM_HEADER_MAJOR) { |
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log_error(ls, "version mismatch: %x nodeid %d: %x", |
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DLM_HEADER_MAJOR | DLM_HEADER_MINOR, nodeid, |
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rc->rc_header.h_version); |
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return -EPROTO; |
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} |
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if (le32_to_cpu(rf->rf_lvblen) != ls->ls_lvblen || |
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le32_to_cpu(rf->rf_lsflags) != ls->ls_exflags) { |
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log_error(ls, "config mismatch: %d,%x nodeid %d: %d,%x", |
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ls->ls_lvblen, ls->ls_exflags, nodeid, |
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le32_to_cpu(rf->rf_lvblen), |
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le32_to_cpu(rf->rf_lsflags)); |
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return -EPROTO; |
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} |
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return 0; |
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} |
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static void allow_sync_reply(struct dlm_ls *ls, uint64_t *new_seq) |
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{ |
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spin_lock(&ls->ls_rcom_spin); |
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*new_seq = ++ls->ls_rcom_seq; |
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set_bit(LSFL_RCOM_WAIT, &ls->ls_flags); |
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spin_unlock(&ls->ls_rcom_spin); |
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} |
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static void disallow_sync_reply(struct dlm_ls *ls) |
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{ |
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spin_lock(&ls->ls_rcom_spin); |
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clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags); |
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clear_bit(LSFL_RCOM_READY, &ls->ls_flags); |
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spin_unlock(&ls->ls_rcom_spin); |
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} |
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/* |
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* low nodeid gathers one slot value at a time from each node. |
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* it sets need_slots=0, and saves rf_our_slot returned from each |
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* rcom_config. |
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* |
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* other nodes gather all slot values at once from the low nodeid. |
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* they set need_slots=1, and ignore the rf_our_slot returned from each |
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* rcom_config. they use the rf_num_slots returned from the low |
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* node's rcom_config. |
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*/ |
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int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags) |
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{ |
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struct dlm_rcom *rc; |
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struct dlm_mhandle *mh; |
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int error = 0; |
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ls->ls_recover_nodeid = nodeid; |
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if (nodeid == dlm_our_nodeid()) { |
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rc = ls->ls_recover_buf; |
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rc->rc_result = dlm_recover_status(ls); |
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goto out; |
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} |
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retry: |
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error = create_rcom(ls, nodeid, DLM_RCOM_STATUS, |
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sizeof(struct rcom_status), &rc, &mh); |
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if (error) |
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goto out; |
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set_rcom_status(ls, (struct rcom_status *)rc->rc_buf, status_flags); |
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allow_sync_reply(ls, &rc->rc_id); |
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memset(ls->ls_recover_buf, 0, LOWCOMMS_MAX_TX_BUFFER_LEN); |
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send_rcom(ls, mh, rc); |
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error = dlm_wait_function(ls, &rcom_response); |
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disallow_sync_reply(ls); |
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if (error == -ETIMEDOUT) |
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goto retry; |
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if (error) |
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goto out; |
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rc = ls->ls_recover_buf; |
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if (rc->rc_result == -ESRCH) { |
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/* we pretend the remote lockspace exists with 0 status */ |
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log_debug(ls, "remote node %d not ready", nodeid); |
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rc->rc_result = 0; |
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error = 0; |
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} else { |
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error = check_rcom_config(ls, rc, nodeid); |
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} |
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/* the caller looks at rc_result for the remote recovery status */ |
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out: |
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return error; |
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} |
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static void receive_rcom_status(struct dlm_ls *ls, struct dlm_rcom *rc_in) |
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{ |
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struct dlm_rcom *rc; |
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struct dlm_mhandle *mh; |
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struct rcom_status *rs; |
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uint32_t status; |
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int nodeid = rc_in->rc_header.h_nodeid; |
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int len = sizeof(struct rcom_config); |
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int num_slots = 0; |
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int error; |
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if (!dlm_slots_version(&rc_in->rc_header)) { |
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status = dlm_recover_status(ls); |
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goto do_create; |
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} |
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rs = (struct rcom_status *)rc_in->rc_buf; |
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if (!(le32_to_cpu(rs->rs_flags) & DLM_RSF_NEED_SLOTS)) { |
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status = dlm_recover_status(ls); |
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goto do_create; |
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} |
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spin_lock(&ls->ls_recover_lock); |
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status = ls->ls_recover_status; |
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num_slots = ls->ls_num_slots; |
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spin_unlock(&ls->ls_recover_lock); |
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len += num_slots * sizeof(struct rcom_slot); |
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do_create: |
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error = create_rcom(ls, nodeid, DLM_RCOM_STATUS_REPLY, |
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len, &rc, &mh); |
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if (error) |
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return; |
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rc->rc_id = rc_in->rc_id; |
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rc->rc_seq_reply = rc_in->rc_seq; |
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rc->rc_result = status; |
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set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, num_slots); |
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if (!num_slots) |
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goto do_send; |
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spin_lock(&ls->ls_recover_lock); |
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if (ls->ls_num_slots != num_slots) { |
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spin_unlock(&ls->ls_recover_lock); |
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log_debug(ls, "receive_rcom_status num_slots %d to %d", |
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num_slots, ls->ls_num_slots); |
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rc->rc_result = 0; |
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set_rcom_config(ls, (struct rcom_config *)rc->rc_buf, 0); |
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goto do_send; |
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} |
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dlm_slots_copy_out(ls, rc); |
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spin_unlock(&ls->ls_recover_lock); |
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do_send: |
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send_rcom(ls, mh, rc); |
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} |
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static void receive_sync_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in) |
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{ |
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spin_lock(&ls->ls_rcom_spin); |
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if (!test_bit(LSFL_RCOM_WAIT, &ls->ls_flags) || |
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rc_in->rc_id != ls->ls_rcom_seq) { |
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log_debug(ls, "reject reply %d from %d seq %llx expect %llx", |
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rc_in->rc_type, rc_in->rc_header.h_nodeid, |
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(unsigned long long)rc_in->rc_id, |
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(unsigned long long)ls->ls_rcom_seq); |
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goto out; |
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} |
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memcpy(ls->ls_recover_buf, rc_in, rc_in->rc_header.h_length); |
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set_bit(LSFL_RCOM_READY, &ls->ls_flags); |
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clear_bit(LSFL_RCOM_WAIT, &ls->ls_flags); |
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wake_up(&ls->ls_wait_general); |
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out: |
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spin_unlock(&ls->ls_rcom_spin); |
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} |
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int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len) |
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{ |
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struct dlm_rcom *rc; |
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struct dlm_mhandle *mh; |
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int error = 0; |
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ls->ls_recover_nodeid = nodeid; |
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retry: |
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error = create_rcom(ls, nodeid, DLM_RCOM_NAMES, last_len, &rc, &mh); |
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if (error) |
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goto out; |
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memcpy(rc->rc_buf, last_name, last_len); |
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allow_sync_reply(ls, &rc->rc_id); |
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memset(ls->ls_recover_buf, 0, LOWCOMMS_MAX_TX_BUFFER_LEN); |
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send_rcom(ls, mh, rc); |
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error = dlm_wait_function(ls, &rcom_response); |
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disallow_sync_reply(ls); |
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if (error == -ETIMEDOUT) |
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goto retry; |
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out: |
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return error; |
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} |
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static void receive_rcom_names(struct dlm_ls *ls, struct dlm_rcom *rc_in) |
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{ |
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struct dlm_rcom *rc; |
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struct dlm_mhandle *mh; |
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int error, inlen, outlen, nodeid; |
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nodeid = rc_in->rc_header.h_nodeid; |
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inlen = rc_in->rc_header.h_length - sizeof(struct dlm_rcom); |
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outlen = LOWCOMMS_MAX_TX_BUFFER_LEN - sizeof(struct dlm_rcom); |
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error = create_rcom(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen, &rc, &mh); |
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if (error) |
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return; |
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rc->rc_id = rc_in->rc_id; |
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rc->rc_seq_reply = rc_in->rc_seq; |
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dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen, |
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nodeid); |
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send_rcom(ls, mh, rc); |
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} |
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int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid) |
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{ |
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struct dlm_rcom *rc; |
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struct dlm_mhandle *mh; |
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struct dlm_ls *ls = r->res_ls; |
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int error; |
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error = create_rcom(ls, dir_nodeid, DLM_RCOM_LOOKUP, r->res_length, |
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&rc, &mh); |
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if (error) |
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goto out; |
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memcpy(rc->rc_buf, r->res_name, r->res_length); |
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rc->rc_id = (unsigned long) r->res_id; |
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send_rcom(ls, mh, rc); |
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out: |
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return error; |
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} |
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static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in) |
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{ |
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struct dlm_rcom *rc; |
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struct dlm_mhandle *mh; |
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int error, ret_nodeid, nodeid = rc_in->rc_header.h_nodeid; |
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int len = rc_in->rc_header.h_length - sizeof(struct dlm_rcom); |
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error = create_rcom(ls, nodeid, DLM_RCOM_LOOKUP_REPLY, 0, &rc, &mh); |
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if (error) |
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return; |
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/* Old code would send this special id to trigger a debug dump. */ |
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if (rc_in->rc_id == 0xFFFFFFFF) { |
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log_error(ls, "receive_rcom_lookup dump from %d", nodeid); |
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dlm_dump_rsb_name(ls, rc_in->rc_buf, len); |
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return; |
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} |
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error = dlm_master_lookup(ls, nodeid, rc_in->rc_buf, len, |
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DLM_LU_RECOVER_MASTER, &ret_nodeid, NULL); |
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if (error) |
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ret_nodeid = error; |
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rc->rc_result = ret_nodeid; |
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rc->rc_id = rc_in->rc_id; |
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rc->rc_seq_reply = rc_in->rc_seq; |
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send_rcom(ls, mh, rc); |
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} |
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static void receive_rcom_lookup_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in) |
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{ |
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dlm_recover_master_reply(ls, rc_in); |
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} |
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static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb, |
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struct rcom_lock *rl) |
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{ |
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memset(rl, 0, sizeof(*rl)); |
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rl->rl_ownpid = cpu_to_le32(lkb->lkb_ownpid); |
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rl->rl_lkid = cpu_to_le32(lkb->lkb_id); |
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rl->rl_exflags = cpu_to_le32(lkb->lkb_exflags); |
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rl->rl_flags = cpu_to_le32(lkb->lkb_flags); |
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rl->rl_lvbseq = cpu_to_le32(lkb->lkb_lvbseq); |
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rl->rl_rqmode = lkb->lkb_rqmode; |
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rl->rl_grmode = lkb->lkb_grmode; |
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rl->rl_status = lkb->lkb_status; |
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rl->rl_wait_type = cpu_to_le16(lkb->lkb_wait_type); |
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if (lkb->lkb_bastfn) |
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rl->rl_asts |= DLM_CB_BAST; |
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if (lkb->lkb_astfn) |
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rl->rl_asts |= DLM_CB_CAST; |
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rl->rl_namelen = cpu_to_le16(r->res_length); |
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memcpy(rl->rl_name, r->res_name, r->res_length); |
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/* FIXME: might we have an lvb without DLM_LKF_VALBLK set ? |
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If so, receive_rcom_lock_args() won't take this copy. */ |
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if (lkb->lkb_lvbptr) |
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memcpy(rl->rl_lvb, lkb->lkb_lvbptr, r->res_ls->ls_lvblen); |
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} |
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int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb) |
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{ |
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struct dlm_ls *ls = r->res_ls; |
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struct dlm_rcom *rc; |
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struct dlm_mhandle *mh; |
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struct rcom_lock *rl; |
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int error, len = sizeof(struct rcom_lock); |
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if (lkb->lkb_lvbptr) |
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len += ls->ls_lvblen; |
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error = create_rcom(ls, r->res_nodeid, DLM_RCOM_LOCK, len, &rc, &mh); |
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if (error) |
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goto out; |
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rl = (struct rcom_lock *) rc->rc_buf; |
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pack_rcom_lock(r, lkb, rl); |
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rc->rc_id = (unsigned long) r; |
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send_rcom(ls, mh, rc); |
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out: |
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return error; |
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} |
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/* needs at least dlm_rcom + rcom_lock */ |
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static void receive_rcom_lock(struct dlm_ls *ls, struct dlm_rcom *rc_in) |
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{ |
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struct dlm_rcom *rc; |
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struct dlm_mhandle *mh; |
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int error, nodeid = rc_in->rc_header.h_nodeid; |
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dlm_recover_master_copy(ls, rc_in); |
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error = create_rcom(ls, nodeid, DLM_RCOM_LOCK_REPLY, |
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sizeof(struct rcom_lock), &rc, &mh); |
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if (error) |
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return; |
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/* We send back the same rcom_lock struct we received, but |
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dlm_recover_master_copy() has filled in rl_remid and rl_result */ |
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memcpy(rc->rc_buf, rc_in->rc_buf, sizeof(struct rcom_lock)); |
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rc->rc_id = rc_in->rc_id; |
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rc->rc_seq_reply = rc_in->rc_seq; |
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send_rcom(ls, mh, rc); |
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} |
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/* If the lockspace doesn't exist then still send a status message |
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back; it's possible that it just doesn't have its global_id yet. */ |
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int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in) |
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{ |
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struct dlm_rcom *rc; |
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struct rcom_config *rf; |
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struct dlm_mhandle *mh; |
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char *mb; |
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int mb_len = sizeof(struct dlm_rcom) + sizeof(struct rcom_config); |
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mh = dlm_lowcomms_get_buffer(nodeid, mb_len, GFP_NOFS, &mb); |
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if (!mh) |
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return -ENOBUFS; |
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memset(mb, 0, mb_len); |
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|
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rc = (struct dlm_rcom *) mb; |
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|
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rc->rc_header.h_version = (DLM_HEADER_MAJOR | DLM_HEADER_MINOR); |
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rc->rc_header.h_lockspace = rc_in->rc_header.h_lockspace; |
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rc->rc_header.h_nodeid = dlm_our_nodeid(); |
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rc->rc_header.h_length = mb_len; |
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rc->rc_header.h_cmd = DLM_RCOM; |
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|
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rc->rc_type = DLM_RCOM_STATUS_REPLY; |
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rc->rc_id = rc_in->rc_id; |
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rc->rc_seq_reply = rc_in->rc_seq; |
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rc->rc_result = -ESRCH; |
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|
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rf = (struct rcom_config *) rc->rc_buf; |
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rf->rf_lvblen = cpu_to_le32(~0U); |
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|
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dlm_rcom_out(rc); |
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dlm_lowcomms_commit_buffer(mh); |
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|
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return 0; |
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} |
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|
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/* |
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* Ignore messages for stage Y before we set |
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* recover_status bit for stage X: |
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* |
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* recover_status = 0 |
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* |
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* dlm_recover_members() |
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* - send nothing |
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* - recv nothing |
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* - ignore NAMES, NAMES_REPLY |
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* - ignore LOOKUP, LOOKUP_REPLY |
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* - ignore LOCK, LOCK_REPLY |
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* |
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* recover_status |= NODES |
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* |
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* dlm_recover_members_wait() |
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* |
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* dlm_recover_directory() |
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* - send NAMES |
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* - recv NAMES_REPLY |
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* - ignore LOOKUP, LOOKUP_REPLY |
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* - ignore LOCK, LOCK_REPLY |
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* |
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* recover_status |= DIR |
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* |
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* dlm_recover_directory_wait() |
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* |
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* dlm_recover_masters() |
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* - send LOOKUP |
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* - 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); |
|
} |
|
|
|
|