1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2001-2004 Cluster File Systems, Inc.
5 * Author: Andreas Dilger <adilger@clusterfs.com>
7 * This file is part of Lustre, http://www.lustre.org.
9 * Lustre is free software; you can redistribute it and/or
10 * modify it under the terms of version 2 of the GNU General Public
11 * License as published by the Free Software Foundation.
13 * Lustre is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with Lustre; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 * remote api for llog - client side
26 #define DEBUG_SUBSYSTEM S_LOG
35 #include <liblustre.h>
38 #include <linux/obd_class.h>
39 #include <linux/lustre_log.h>
40 #include <linux/lustre_net.h>
41 #include <libcfs/list.h>
43 /* This is a callback from the llog_* functions.
44 * Assumes caller has already pushed us into the kernel context. */
45 static int llog_client_create(struct llog_ctxt *ctxt, struct llog_handle **res,
46 struct llog_logid *logid, char *name)
48 struct obd_import *imp;
49 struct llogd_body req_body;
50 struct llogd_body *body;
51 struct llog_handle *handle;
52 struct ptlrpc_request *req = NULL;
53 int size[2] = {sizeof(req_body)};
54 char *tmp[2] = {(char*) &req_body};
56 int repsize[] = {sizeof (req_body)};
60 if (ctxt->loc_imp == NULL) {
61 /* This used to be an assert; bug 6200 */
62 CERROR("ctxt->loc_imp == NULL for context idx %d. Unable to "
63 "complete MDS/OSS recovery, but I'll try again next "
64 "time. Not fatal.\n", ctxt->loc_idx);
69 handle = llog_alloc_handle();
74 memset(&req_body, 0, sizeof(req_body));
76 req_body.lgd_logid = *logid;
77 req_body.lgd_ctxt_idx = ctxt->loc_idx - 1;
80 size[bufcount] = strlen(name) + 1;
85 req = ptlrpc_prep_req(imp, LLOG_ORIGIN_HANDLE_CREATE,bufcount,size,tmp);
87 GOTO(err_free, rc = -ENOMEM);
89 req->rq_replen = lustre_msg_size(1, repsize);
90 rc = ptlrpc_queue_wait(req);
94 body = lustre_swab_repbuf(req, 0, sizeof(*body),
95 lustre_swab_llogd_body);
97 CERROR ("Can't unpack llogd_body\n");
98 GOTO(err_free, rc =-EFAULT);
101 handle->lgh_id = body->lgd_logid;
102 handle->lgh_ctxt = ctxt;
106 ptlrpc_req_finished(req);
110 llog_free_handle(handle);
115 static int llog_client_next_block(struct llog_handle *loghandle,
116 int *cur_idx, int next_idx,
117 __u64 *cur_offset, void *buf, int len)
119 struct obd_import *imp = loghandle->lgh_ctxt->loc_imp;
120 struct ptlrpc_request *req = NULL;
121 struct llogd_body *body;
123 int size = sizeof(*body);
124 int repsize[2] = {sizeof (*body)};
128 req = ptlrpc_prep_req(imp, LLOG_ORIGIN_HANDLE_NEXT_BLOCK, 1,&size,NULL);
130 GOTO(out, rc = -ENOMEM);
132 body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
133 body->lgd_logid = loghandle->lgh_id;
134 body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
135 body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
136 body->lgd_index = next_idx;
137 body->lgd_saved_index = *cur_idx;
139 body->lgd_cur_offset = *cur_offset;
142 req->rq_replen = lustre_msg_size(2, repsize);
143 rc = ptlrpc_queue_wait(req);
147 body = lustre_swab_repbuf(req, 0, sizeof(*body),
148 lustre_swab_llogd_body);
150 CERROR ("Can't unpack llogd_body\n");
151 GOTO(out, rc =-EFAULT);
154 /* The log records are swabbed as they are processed */
155 ptr = lustre_msg_buf(req->rq_repmsg, 1, len);
157 CERROR ("Can't unpack bitmap\n");
158 GOTO(out, rc =-EFAULT);
161 *cur_idx = body->lgd_saved_index;
162 *cur_offset = body->lgd_cur_offset;
164 memcpy(buf, ptr, len);
168 ptlrpc_req_finished(req);
173 static int llog_client_read_header(struct llog_handle *handle)
175 struct obd_import *imp = handle->lgh_ctxt->loc_imp;
176 struct ptlrpc_request *req = NULL;
177 struct llogd_body *body;
178 struct llog_log_hdr *hdr;
179 struct llog_rec_hdr *llh_hdr;
180 int size = sizeof(*body);
181 int repsize = sizeof (*hdr);
185 req = ptlrpc_prep_req(imp, LLOG_ORIGIN_HANDLE_READ_HEADER,1,&size,NULL);
187 GOTO(out, rc = -ENOMEM);
189 body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
190 body->lgd_logid = handle->lgh_id;
191 body->lgd_ctxt_idx = handle->lgh_ctxt->loc_idx - 1;
192 body->lgd_llh_flags = handle->lgh_hdr->llh_flags;
194 req->rq_replen = lustre_msg_size(1, &repsize);
195 rc = ptlrpc_queue_wait(req);
199 hdr = lustre_swab_repbuf(req, 0, sizeof(*hdr), lustre_swab_llog_hdr);
201 CERROR ("Can't unpack llog_hdr\n");
202 GOTO(out, rc =-EFAULT);
205 memcpy(handle->lgh_hdr, hdr, sizeof (*hdr));
206 handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
209 llh_hdr = &handle->lgh_hdr->llh_hdr;
210 if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
211 CERROR("bad log header magic: %#x (expecting %#x)\n",
212 llh_hdr->lrh_type, LLOG_HDR_MAGIC);
214 } else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
215 CERROR("incorrectly sized log header: %#x "
217 llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
218 CERROR("you may need to re-run lconf --write_conf.\n");
224 ptlrpc_req_finished(req);
228 static int llog_client_close(struct llog_handle *handle)
236 struct llog_operations llog_client_ops = {
237 lop_next_block: llog_client_next_block,
238 lop_read_header: llog_client_read_header,
239 lop_create: llog_client_create,
240 lop_close: llog_client_close,