512 lines
13 KiB
C
512 lines
13 KiB
C
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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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** This copyrighted material is made available to anyone wishing to use,
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** modify, copy, or redistribute it subject to the terms and conditions
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** of the GNU General Public License v.2.
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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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/* 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 make_config(struct dlm_ls *ls, struct rcom_config *rf)
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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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}
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static int check_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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size_t conf_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_config);
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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 (rc->rc_header.h_length < conf_size) {
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log_error(ls, "config too short: %d nodeid %d",
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rc->rc_header.h_length, nodeid);
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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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int dlm_rcom_status(struct dlm_ls *ls, int 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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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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error = create_rcom(ls, nodeid, DLM_RCOM_STATUS, 0, &rc, &mh);
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if (error)
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goto out;
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allow_sync_reply(ls, &rc->rc_id);
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memset(ls->ls_recover_buf, 0, dlm_config.ci_buffer_size);
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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)
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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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} else
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error = check_config(ls, rc, nodeid);
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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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int error, nodeid = rc_in->rc_header.h_nodeid;
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error = create_rcom(ls, nodeid, DLM_RCOM_STATUS_REPLY,
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sizeof(struct rcom_config), &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 = dlm_recover_status(ls);
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make_config(ls, (struct rcom_config *) rc->rc_buf);
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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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int max_size = dlm_config.ci_buffer_size - sizeof(struct dlm_rcom);
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ls->ls_recover_nodeid = nodeid;
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if (nodeid == dlm_our_nodeid()) {
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ls->ls_recover_buf->rc_header.h_length =
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dlm_config.ci_buffer_size;
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dlm_copy_master_names(ls, last_name, last_len,
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ls->ls_recover_buf->rc_buf,
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max_size, nodeid);
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goto out;
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}
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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, dlm_config.ci_buffer_size);
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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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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 = dlm_config.ci_buffer_size - 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;
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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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error = dlm_dir_lookup(ls, nodeid, rc_in->rc_buf, len, &ret_nodeid);
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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 |= AST_BAST;
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if (lkb->lkb_astfn)
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rl->rl_asts |= AST_COMP;
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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);
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int is_old_reply(struct dlm_ls *ls, struct dlm_rcom *rc)
|
||
|
|
{
|
||
|
|
uint64_t seq;
|
||
|
|
int rv = 0;
|
||
|
|
|
||
|
|
switch (rc->rc_type) {
|
||
|
|
case DLM_RCOM_STATUS_REPLY:
|
||
|
|
case DLM_RCOM_NAMES_REPLY:
|
||
|
|
case DLM_RCOM_LOOKUP_REPLY:
|
||
|
|
case DLM_RCOM_LOCK_REPLY:
|
||
|
|
spin_lock(&ls->ls_recover_lock);
|
||
|
|
seq = ls->ls_recover_seq;
|
||
|
|
spin_unlock(&ls->ls_recover_lock);
|
||
|
|
if (rc->rc_seq_reply != seq) {
|
||
|
|
log_debug(ls, "ignoring old reply %x from %d "
|
||
|
|
"seq_reply %llx expect %llx",
|
||
|
|
rc->rc_type, rc->rc_header.h_nodeid,
|
||
|
|
(unsigned long long)rc->rc_seq_reply,
|
||
|
|
(unsigned long long)seq);
|
||
|
|
rv = 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return rv;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 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);
|
||
|
|
|
||
|
|
if (dlm_recovery_stopped(ls) && (rc->rc_type != DLM_RCOM_STATUS)) {
|
||
|
|
log_debug(ls, "ignoring recovery message %x from %d",
|
||
|
|
rc->rc_type, nodeid);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (is_old_reply(ls, rc))
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return;
|
||
|
|
Eshort:
|
||
|
|
log_error(ls, "recovery message %x from %d is too short",
|
||
|
|
rc->rc_type, nodeid);
|
||
|
|
}
|
||
|
|
|