334 lines
8.6 KiB
C
334 lines
8.6 KiB
C
/*
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* GPL HEADER START
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 only,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License version 2 for more details (a copy is included
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* in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; If not, see
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* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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* GPL HEADER END
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*/
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/*
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* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
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* Use is subject to license terms.
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*
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* Copyright (c) 2012, 2015, Intel Corporation.
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*/
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/*
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* This file is part of Lustre, http://www.lustre.org/
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* Lustre is a trademark of Sun Microsystems, Inc.
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*
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* lustre/ptlrpc/llog_client.c
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*
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* remote api for llog - client side
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*
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* Author: Andreas Dilger <adilger@clusterfs.com>
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*/
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#define DEBUG_SUBSYSTEM S_LOG
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#include "../../include/linux/libcfs/libcfs.h"
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#include "../include/obd_class.h"
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#include "../include/lustre_log.h"
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#include "../include/lustre_net.h"
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#include <linux/list.h>
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#define LLOG_CLIENT_ENTRY(ctxt, imp) do { \
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mutex_lock(&ctxt->loc_mutex); \
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if (ctxt->loc_imp) { \
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imp = class_import_get(ctxt->loc_imp); \
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} else { \
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CERROR("ctxt->loc_imp == NULL for context idx %d." \
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"Unable to complete MDS/OSS recovery," \
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"but I'll try again next time. Not fatal.\n", \
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ctxt->loc_idx); \
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imp = NULL; \
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mutex_unlock(&ctxt->loc_mutex); \
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return (-EINVAL); \
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} \
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mutex_unlock(&ctxt->loc_mutex); \
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} while (0)
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#define LLOG_CLIENT_EXIT(ctxt, imp) do { \
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mutex_lock(&ctxt->loc_mutex); \
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if (ctxt->loc_imp != imp) \
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CWARN("loc_imp has changed from %p to %p\n", \
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ctxt->loc_imp, imp); \
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class_import_put(imp); \
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mutex_unlock(&ctxt->loc_mutex); \
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} while (0)
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/* This is a callback from the llog_* functions.
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* Assumes caller has already pushed us into the kernel context.
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*/
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static int llog_client_open(const struct lu_env *env,
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struct llog_handle *lgh, struct llog_logid *logid,
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char *name, enum llog_open_param open_param)
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{
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struct obd_import *imp;
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struct llogd_body *body;
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struct llog_ctxt *ctxt = lgh->lgh_ctxt;
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struct ptlrpc_request *req = NULL;
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int rc;
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LLOG_CLIENT_ENTRY(ctxt, imp);
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/* client cannot create llog */
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LASSERTF(open_param != LLOG_OPEN_NEW, "%#x\n", open_param);
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LASSERT(lgh);
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req = ptlrpc_request_alloc(imp, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
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if (!req) {
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rc = -ENOMEM;
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goto out;
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}
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if (name)
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req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
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strlen(name) + 1);
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rc = ptlrpc_request_pack(req, LUSTRE_LOG_VERSION,
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LLOG_ORIGIN_HANDLE_CREATE);
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if (rc) {
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ptlrpc_request_free(req);
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req = NULL;
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goto out;
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}
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ptlrpc_request_set_replen(req);
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body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
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if (logid)
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body->lgd_logid = *logid;
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body->lgd_ctxt_idx = ctxt->loc_idx - 1;
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if (name) {
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char *tmp;
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tmp = req_capsule_client_sized_get(&req->rq_pill, &RMF_NAME,
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strlen(name) + 1);
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LASSERT(tmp);
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strcpy(tmp, name);
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}
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rc = ptlrpc_queue_wait(req);
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if (rc)
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goto out;
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body = req_capsule_server_get(&req->rq_pill, &RMF_LLOGD_BODY);
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if (!body) {
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rc = -EFAULT;
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goto out;
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}
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lgh->lgh_id = body->lgd_logid;
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lgh->lgh_ctxt = ctxt;
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out:
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LLOG_CLIENT_EXIT(ctxt, imp);
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ptlrpc_req_finished(req);
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return rc;
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}
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static int llog_client_next_block(const struct lu_env *env,
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struct llog_handle *loghandle,
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int *cur_idx, int next_idx,
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__u64 *cur_offset, void *buf, int len)
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{
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struct obd_import *imp;
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struct ptlrpc_request *req = NULL;
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struct llogd_body *body;
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void *ptr;
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int rc;
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LLOG_CLIENT_ENTRY(loghandle->lgh_ctxt, imp);
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req = ptlrpc_request_alloc_pack(imp, &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK,
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LUSTRE_LOG_VERSION,
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LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
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if (!req) {
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rc = -ENOMEM;
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goto err_exit;
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}
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body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
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body->lgd_logid = loghandle->lgh_id;
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body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
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body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
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body->lgd_index = next_idx;
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body->lgd_saved_index = *cur_idx;
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body->lgd_len = len;
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body->lgd_cur_offset = *cur_offset;
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req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_SERVER, len);
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ptlrpc_request_set_replen(req);
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rc = ptlrpc_queue_wait(req);
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if (rc)
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goto out;
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body = req_capsule_server_get(&req->rq_pill, &RMF_LLOGD_BODY);
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if (!body) {
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rc = -EFAULT;
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goto out;
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}
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/* The log records are swabbed as they are processed */
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ptr = req_capsule_server_get(&req->rq_pill, &RMF_EADATA);
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if (!ptr) {
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rc = -EFAULT;
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goto out;
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}
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*cur_idx = body->lgd_saved_index;
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*cur_offset = body->lgd_cur_offset;
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memcpy(buf, ptr, len);
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out:
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ptlrpc_req_finished(req);
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err_exit:
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LLOG_CLIENT_EXIT(loghandle->lgh_ctxt, imp);
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return rc;
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}
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static int llog_client_prev_block(const struct lu_env *env,
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struct llog_handle *loghandle,
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int prev_idx, void *buf, int len)
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{
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struct obd_import *imp;
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struct ptlrpc_request *req = NULL;
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struct llogd_body *body;
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void *ptr;
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int rc;
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LLOG_CLIENT_ENTRY(loghandle->lgh_ctxt, imp);
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req = ptlrpc_request_alloc_pack(imp, &RQF_LLOG_ORIGIN_HANDLE_PREV_BLOCK,
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LUSTRE_LOG_VERSION,
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LLOG_ORIGIN_HANDLE_PREV_BLOCK);
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if (!req) {
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rc = -ENOMEM;
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goto err_exit;
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}
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body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
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body->lgd_logid = loghandle->lgh_id;
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body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
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body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
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body->lgd_index = prev_idx;
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body->lgd_len = len;
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req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_SERVER, len);
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ptlrpc_request_set_replen(req);
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rc = ptlrpc_queue_wait(req);
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if (rc)
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goto out;
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body = req_capsule_server_get(&req->rq_pill, &RMF_LLOGD_BODY);
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if (!body) {
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rc = -EFAULT;
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goto out;
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}
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ptr = req_capsule_server_get(&req->rq_pill, &RMF_EADATA);
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if (!ptr) {
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rc = -EFAULT;
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goto out;
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}
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memcpy(buf, ptr, len);
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out:
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ptlrpc_req_finished(req);
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err_exit:
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LLOG_CLIENT_EXIT(loghandle->lgh_ctxt, imp);
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return rc;
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}
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static int llog_client_read_header(const struct lu_env *env,
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struct llog_handle *handle)
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{
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struct obd_import *imp;
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struct ptlrpc_request *req = NULL;
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struct llogd_body *body;
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struct llog_log_hdr *hdr;
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struct llog_rec_hdr *llh_hdr;
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int rc;
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LLOG_CLIENT_ENTRY(handle->lgh_ctxt, imp);
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req = ptlrpc_request_alloc_pack(imp, &RQF_LLOG_ORIGIN_HANDLE_READ_HEADER,
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LUSTRE_LOG_VERSION,
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LLOG_ORIGIN_HANDLE_READ_HEADER);
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if (!req) {
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rc = -ENOMEM;
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goto err_exit;
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}
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body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
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body->lgd_logid = handle->lgh_id;
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body->lgd_ctxt_idx = handle->lgh_ctxt->loc_idx - 1;
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body->lgd_llh_flags = handle->lgh_hdr->llh_flags;
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ptlrpc_request_set_replen(req);
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rc = ptlrpc_queue_wait(req);
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if (rc)
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goto out;
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hdr = req_capsule_server_get(&req->rq_pill, &RMF_LLOG_LOG_HDR);
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if (!hdr) {
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rc = -EFAULT;
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goto out;
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}
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memcpy(handle->lgh_hdr, hdr, sizeof(*hdr));
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handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
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/* sanity checks */
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llh_hdr = &handle->lgh_hdr->llh_hdr;
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if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
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CERROR("bad log header magic: %#x (expecting %#x)\n",
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llh_hdr->lrh_type, LLOG_HDR_MAGIC);
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rc = -EIO;
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} else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
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CERROR("incorrectly sized log header: %#x (expecting %#x)\n",
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llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
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CERROR("you may need to re-run lconf --write_conf.\n");
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rc = -EIO;
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}
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out:
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ptlrpc_req_finished(req);
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err_exit:
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LLOG_CLIENT_EXIT(handle->lgh_ctxt, imp);
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return rc;
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}
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static int llog_client_close(const struct lu_env *env,
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struct llog_handle *handle)
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{
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/* this doesn't call LLOG_ORIGIN_HANDLE_CLOSE because
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* the servers all close the file at the end of every
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* other LLOG_ RPC.
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*/
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return 0;
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}
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struct llog_operations llog_client_ops = {
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.lop_next_block = llog_client_next_block,
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.lop_prev_block = llog_client_prev_block,
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.lop_read_header = llog_client_read_header,
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.lop_open = llog_client_open,
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.lop_close = llog_client_close,
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};
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EXPORT_SYMBOL(llog_client_ops);
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