[DLM] The core of the DLM for GFS2/CLVM
This is the core of the distributed lock manager which is required to use GFS2 as a cluster filesystem. It is also used by CLVM and can be used as a standalone lock manager independantly of either of these two projects. It implements VAX-style locking modes. Signed-off-by: David Teigland <teigland@redhat.com> Signed-off-by: Steve Whitehouse <swhiteho@redhat.com>
This commit is contained in:
David Teigland
committed by
Steven Whitehouse
Steven Whitehouse
parent
e473142070
commit
e7fd41792f
460
fs/dlm/rcom.c
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460
fs/dlm/rcom.c
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@@ -0,0 +1,460 @@
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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 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_KERNEL, &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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*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 = ls->ls_lvblen;
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rf->rf_lsflags = ls->ls_exflags;
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}
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static int check_config(struct dlm_ls *ls, struct rcom_config *rf, int nodeid)
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{
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if (rf->rf_lvblen != ls->ls_lvblen ||
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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,
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nodeid, rf->rf_lvblen, rf->rf_lsflags);
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return -EINVAL;
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}
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return 0;
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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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memset(ls->ls_recover_buf, 0, dlm_config.buffer_size);
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if (nodeid == dlm_our_nodeid()) {
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rc = (struct dlm_rcom *) 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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send_rcom(ls, mh, rc);
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error = dlm_wait_function(ls, &rcom_response);
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clear_bit(LSFL_RCOM_READY, &ls->ls_flags);
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if (error)
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goto out;
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rc = (struct dlm_rcom *) 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, (struct rcom_config *) rc->rc_buf,
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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_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_rcom_status_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
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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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wake_up(&ls->ls_wait_general);
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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, len = sizeof(struct dlm_rcom);
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memset(ls->ls_recover_buf, 0, dlm_config.buffer_size);
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if (nodeid == dlm_our_nodeid()) {
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dlm_copy_master_names(ls, last_name, last_len,
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ls->ls_recover_buf + len,
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dlm_config.buffer_size - len, 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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send_rcom(ls, mh, rc);
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error = dlm_wait_function(ls, &rcom_response);
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clear_bit(LSFL_RCOM_READY, &ls->ls_flags);
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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;
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int nodeid = rc_in->rc_header.h_nodeid;
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uint32_t status = dlm_recover_status(ls);
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/*
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* We can't run dlm_dir_rebuild_send (which uses ls_nodes) while
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* dlm_recoverd is running ls_nodes_reconfig (which changes ls_nodes).
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* It could only happen in rare cases where we get a late NAMES
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* message from a previous instance of recovery.
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*/
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if (!(status & DLM_RS_NODES)) {
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log_debug(ls, "ignoring RCOM_NAMES from %u", nodeid);
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return;
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}
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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.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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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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static void receive_rcom_names_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
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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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wake_up(&ls->ls_wait_general);
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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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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 = lkb->lkb_ownpid;
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rl->rl_lkid = lkb->lkb_id;
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rl->rl_exflags = lkb->lkb_exflags;
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rl->rl_flags = lkb->lkb_flags;
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rl->rl_lvbseq = 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 = lkb->lkb_wait_type;
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if (lkb->lkb_bastaddr)
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rl->rl_asts |= AST_BAST;
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if (lkb->lkb_astaddr)
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rl->rl_asts |= AST_COMP;
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if (lkb->lkb_range)
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memcpy(rl->rl_range, lkb->lkb_range, 4*sizeof(uint64_t));
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rl->rl_namelen = 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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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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send_rcom(ls, mh, rc);
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}
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static void receive_rcom_lock_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
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{
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uint32_t status = dlm_recover_status(ls);
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if (!(status & DLM_RS_DIR)) {
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log_debug(ls, "ignoring RCOM_LOCK_REPLY from %u",
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rc_in->rc_header.h_nodeid);
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return;
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}
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dlm_recover_process_copy(ls, rc_in);
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}
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static int 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 dlm_mhandle *mh;
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char *mb;
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int mb_len = sizeof(struct dlm_rcom);
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mh = dlm_lowcomms_get_buffer(nodeid, mb_len, GFP_KERNEL, &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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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 = 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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rc->rc_type = DLM_RCOM_STATUS_REPLY;
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rc->rc_result = -ESRCH;
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dlm_rcom_out(rc);
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dlm_lowcomms_commit_buffer(mh);
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return 0;
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}
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/* Called by dlm_recvd; corresponds to dlm_receive_message() but special
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recovery-only comms are sent through here. */
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void dlm_receive_rcom(struct dlm_header *hd, int nodeid)
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{
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struct dlm_rcom *rc = (struct dlm_rcom *) hd;
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struct dlm_ls *ls;
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dlm_rcom_in(rc);
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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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ls = dlm_find_lockspace_global(hd->h_lockspace);
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if (!ls) {
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log_print("lockspace %x from %d not found",
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hd->h_lockspace, nodeid);
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send_ls_not_ready(nodeid, rc);
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return;
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}
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if (dlm_recovery_stopped(ls) && (rc->rc_type != DLM_RCOM_STATUS)) {
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log_error(ls, "ignoring recovery message %x from %d",
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rc->rc_type, nodeid);
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goto out;
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}
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if (nodeid != rc->rc_header.h_nodeid) {
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log_error(ls, "bad rcom nodeid %d from %d",
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rc->rc_header.h_nodeid, nodeid);
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goto out;
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}
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switch (rc->rc_type) {
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case DLM_RCOM_STATUS:
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receive_rcom_status(ls, rc);
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break;
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case DLM_RCOM_NAMES:
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receive_rcom_names(ls, rc);
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break;
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case DLM_RCOM_LOOKUP:
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receive_rcom_lookup(ls, rc);
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break;
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case DLM_RCOM_LOCK:
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receive_rcom_lock(ls, rc);
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break;
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case DLM_RCOM_STATUS_REPLY:
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receive_rcom_status_reply(ls, rc);
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break;
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case DLM_RCOM_NAMES_REPLY:
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receive_rcom_names_reply(ls, rc);
|
||||
break;
|
||||
|
||||
case DLM_RCOM_LOOKUP_REPLY:
|
||||
receive_rcom_lookup_reply(ls, rc);
|
||||
break;
|
||||
|
||||
case DLM_RCOM_LOCK_REPLY:
|
||||
receive_rcom_lock_reply(ls, rc);
|
||||
break;
|
||||
|
||||
default:
|
||||
DLM_ASSERT(0, printk("rc_type=%x\n", rc->rc_type););
|
||||
}
|
||||
out:
|
||||
dlm_put_lockspace(ls);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user