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_open(struct llog_ctxt *ctxt, struct llog_handle **res,
46 struct llog_logid *logid, char *name, int flags)
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};
55 int bufcount = 1, repsize[] = {sizeof (req_body)}, rc;
58 LASSERT(ctxt->loc_imp);
61 handle = llog_alloc_handle();
66 memset(&req_body, 0, sizeof(req_body));
68 req_body.lgd_logid = *logid;
69 req_body.lgd_ctxt_idx = ctxt->loc_idx - 1;
70 req_body.lgd_llh_flags = flags;
73 size[bufcount] = strlen(name) + 1;
78 req = ptlrpc_prep_req(imp, LUSTRE_LOG_VERSION, LLOG_ORIGIN_HANDLE_OPEN,
81 GOTO(err_free, rc = -ENOMEM);
83 req->rq_replen = lustre_msg_size(1, repsize);
84 rc = ptlrpc_queue_wait(req);
88 body = lustre_swab_repbuf(req, 0, sizeof(*body),
89 lustre_swab_llogd_body);
91 CERROR ("Can't unpack llogd_body\n");
92 GOTO(err_free, rc =-EFAULT);
95 handle->lgh_id = body->lgd_logid;
96 handle->lgh_ctxt = ctxt;
100 ptlrpc_req_finished(req);
104 llog_free_handle(handle);
108 static int llog_client_prev_block(struct llog_handle *loghandle,
109 int prev_idx, void *buf, int len)
111 struct obd_import *imp = loghandle->lgh_ctxt->loc_imp;
112 struct ptlrpc_request *req = NULL;
113 struct llogd_body *body;
115 int size = sizeof(*body);
116 int repsize[2] = {sizeof (*body)};
120 req = ptlrpc_prep_req(imp, LUSTRE_LOG_VERSION,
121 LLOG_ORIGIN_HANDLE_PREV_BLOCK, 1, &size, NULL);
123 GOTO(out, rc = -ENOMEM);
125 body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
126 body->lgd_logid = loghandle->lgh_id;
127 body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
128 body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
129 body->lgd_index = prev_idx;
133 req->rq_replen = lustre_msg_size(2, repsize);
134 rc = ptlrpc_queue_wait(req);
138 body = lustre_swab_repbuf(req, 0, sizeof(*body),
139 lustre_swab_llogd_body);
141 CERROR ("Can't unpack llogd_body\n");
142 GOTO(out, rc =-EFAULT);
145 ptr = lustre_msg_buf(req->rq_repmsg, 1, len);
147 CERROR ("Can't unpack bitmap\n");
148 GOTO(out, rc =-EFAULT);
151 memcpy(buf, ptr, len);
154 ptlrpc_req_finished(req);
158 static int llog_client_next_block(struct llog_handle *loghandle,
159 int *cur_idx, int next_idx,
160 __u64 *cur_offset, void *buf, int len)
162 struct obd_import *imp = loghandle->lgh_ctxt->loc_imp;
163 struct ptlrpc_request *req = NULL;
164 struct llogd_body *body;
166 int size = sizeof(*body);
167 int repsize[2] = {sizeof (*body)};
171 req = ptlrpc_prep_req(imp, LUSTRE_LOG_VERSION,
172 LLOG_ORIGIN_HANDLE_NEXT_BLOCK, 1, &size, NULL);
174 GOTO(out, rc = -ENOMEM);
176 body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
177 body->lgd_logid = loghandle->lgh_id;
178 body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
179 body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
180 body->lgd_index = next_idx;
181 body->lgd_saved_index = *cur_idx;
183 body->lgd_cur_offset = *cur_offset;
186 req->rq_replen = lustre_msg_size(2, repsize);
187 rc = ptlrpc_queue_wait(req);
191 body = lustre_swab_repbuf(req, 0, sizeof(*body),
192 lustre_swab_llogd_body);
194 CERROR ("Can't unpack llogd_body\n");
195 GOTO(out, rc =-EFAULT);
198 ptr = lustre_msg_buf(req->rq_repmsg, 1, len);
200 CERROR ("Can't unpack bitmap\n");
201 GOTO(out, rc =-EFAULT);
204 *cur_idx = body->lgd_saved_index;
205 *cur_offset = body->lgd_cur_offset;
207 memcpy(buf, ptr, len);
211 ptlrpc_req_finished(req);
216 static int llog_client_read_header(struct llog_handle *handle)
218 struct obd_import *imp = handle->lgh_ctxt->loc_imp;
219 struct ptlrpc_request *req = NULL;
220 struct llogd_body *body;
221 struct llog_log_hdr *hdr;
222 struct llog_rec_hdr *llh_hdr;
223 int size = sizeof(*body);
224 int repsize = sizeof (*hdr);
228 req = ptlrpc_prep_req(imp, LUSTRE_LOG_VERSION,
229 LLOG_ORIGIN_HANDLE_READ_HEADER, 1, &size, NULL);
231 GOTO(out, rc = -ENOMEM);
233 body = lustre_msg_buf(req->rq_reqmsg, 0, sizeof (*body));
234 body->lgd_logid = handle->lgh_id;
235 body->lgd_ctxt_idx = handle->lgh_ctxt->loc_idx - 1;
236 body->lgd_llh_flags = handle->lgh_hdr->llh_flags;
238 req->rq_replen = lustre_msg_size(1, &repsize);
239 rc = ptlrpc_queue_wait(req);
243 hdr = lustre_swab_repbuf(req, 0, sizeof(*hdr), lustre_swab_llog_hdr);
245 CERROR ("Can't unpack llog_hdr\n");
246 GOTO(out, rc =-EFAULT);
249 memcpy(handle->lgh_hdr, hdr, sizeof (*hdr));
250 handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
253 llh_hdr = &handle->lgh_hdr->llh_hdr;
254 if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
255 CERROR("bad log header magic: %#x (expecting %#x)\n",
256 llh_hdr->lrh_type, LLOG_HDR_MAGIC);
258 } else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
259 CERROR("incorrectly sized log header: %#x "
261 llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
262 CERROR("you may need to re-run lconf --write_conf.\n");
268 ptlrpc_req_finished(req);
272 static int llog_client_close(struct llog_handle *handle)
280 struct llog_operations llog_client_ops = {
281 lop_prev_block: llog_client_prev_block,
282 lop_next_block: llog_client_next_block,
283 lop_read_header: llog_client_read_header,
284 lop_open: llog_client_open,
285 lop_close: llog_client_close,