4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2015, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/ptlrpc/llog_client.c
34 * remote api for llog - client side
36 * Author: Andreas Dilger <adilger@clusterfs.com>
39 #define DEBUG_SUBSYSTEM S_LOG
41 #include <linux/list.h>
42 #include <libcfs/libcfs.h>
44 #include <obd_class.h>
45 #include <lustre_log.h>
46 #include <lustre_net.h>
48 #define LLOG_CLIENT_ENTRY(ctxt, imp) do { \
49 mutex_lock(&ctxt->loc_mutex); \
50 if (ctxt->loc_imp) { \
51 imp = class_import_get(ctxt->loc_imp); \
53 CERROR("ctxt->loc_imp == NULL for context idx %d." \
54 "Unable to complete MDS/OSS recovery," \
55 "but I'll try again next time. Not fatal.\n", \
58 mutex_unlock(&ctxt->loc_mutex); \
61 mutex_unlock(&ctxt->loc_mutex); \
64 #define LLOG_CLIENT_EXIT(ctxt, imp) do { \
65 mutex_lock(&ctxt->loc_mutex); \
66 if (ctxt->loc_imp != imp) \
67 CWARN("loc_imp has changed from %p to %p\n", \
68 ctxt->loc_imp, imp); \
69 class_import_put(imp); \
70 mutex_unlock(&ctxt->loc_mutex); \
73 /* This is a callback from the llog_* functions.
74 * Assumes caller has already pushed us into the kernel context. */
75 static int llog_client_open(const struct lu_env *env,
76 struct llog_handle *lgh, struct llog_logid *logid,
77 char *name, enum llog_open_param open_param)
79 struct obd_import *imp;
80 struct llogd_body *body;
81 struct llog_ctxt *ctxt = lgh->lgh_ctxt;
82 struct ptlrpc_request *req = NULL;
86 LLOG_CLIENT_ENTRY(ctxt, imp);
88 /* client cannot create llog */
89 LASSERTF(open_param != LLOG_OPEN_NEW, "%#x\n", open_param);
92 req = ptlrpc_request_alloc(imp, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
94 GOTO(out, rc = -ENOMEM);
97 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
100 rc = ptlrpc_request_pack(req, LUSTRE_LOG_VERSION,
101 LLOG_ORIGIN_HANDLE_CREATE);
103 ptlrpc_request_free(req);
107 ptlrpc_request_set_replen(req);
109 body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
111 body->lgd_logid = *logid;
112 body->lgd_ctxt_idx = ctxt->loc_idx - 1;
116 tmp = req_capsule_client_sized_get(&req->rq_pill, &RMF_NAME,
122 rc = ptlrpc_queue_wait(req);
126 body = req_capsule_server_get(&req->rq_pill, &RMF_LLOGD_BODY);
128 GOTO(out, rc = -EFAULT);
130 lgh->lgh_id = body->lgd_logid;
131 lgh->lgh_ctxt = ctxt;
134 LLOG_CLIENT_EXIT(ctxt, imp);
135 ptlrpc_req_finished(req);
139 static int llog_client_next_block(const struct lu_env *env,
140 struct llog_handle *loghandle,
141 int *cur_idx, int next_idx,
142 __u64 *cur_offset, void *buf, int len)
144 struct obd_import *imp;
145 struct ptlrpc_request *req = NULL;
146 struct llogd_body *body;
151 LLOG_CLIENT_ENTRY(loghandle->lgh_ctxt, imp);
152 req = ptlrpc_request_alloc_pack(imp, &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK,
154 LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
156 GOTO(err_exit, rc =-ENOMEM);
158 body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
159 body->lgd_logid = loghandle->lgh_id;
160 body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
161 body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
162 body->lgd_index = next_idx;
163 body->lgd_saved_index = *cur_idx;
165 body->lgd_cur_offset = *cur_offset;
167 req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_SERVER, len);
168 ptlrpc_request_set_replen(req);
169 rc = ptlrpc_queue_wait(req);
170 /* -EIO has a special meaning here. If llog_osd_next_block()
171 * reaches the end of the log without finding the desired
172 * record then it updates *cur_offset and *cur_idx and returns
173 * -EIO. In llog_process_thread() we use this to detect
174 * EOF. But we must be careful to distinguish between -EIO
175 * coming from llog_osd_next_block() and -EIO coming from
176 * ptlrpc or below. */
178 if (req->rq_repmsg == NULL ||
179 lustre_msg_get_status(req->rq_repmsg) != -EIO)
185 body = req_capsule_server_get(&req->rq_pill, &RMF_LLOGD_BODY);
187 GOTO(out, rc = -EFAULT);
189 *cur_idx = body->lgd_saved_index;
190 *cur_offset = body->lgd_cur_offset;
195 /* The log records are swabbed as they are processed */
196 ptr = req_capsule_server_get(&req->rq_pill, &RMF_EADATA);
198 GOTO(out, rc =-EFAULT);
200 memcpy(buf, ptr, len);
203 ptlrpc_req_finished(req);
205 LLOG_CLIENT_EXIT(loghandle->lgh_ctxt, imp);
209 static int llog_client_prev_block(const struct lu_env *env,
210 struct llog_handle *loghandle,
211 int prev_idx, void *buf, int len)
213 struct obd_import *imp;
214 struct ptlrpc_request *req = NULL;
215 struct llogd_body *body;
220 LLOG_CLIENT_ENTRY(loghandle->lgh_ctxt, imp);
221 req = ptlrpc_request_alloc_pack(imp, &RQF_LLOG_ORIGIN_HANDLE_PREV_BLOCK,
223 LLOG_ORIGIN_HANDLE_PREV_BLOCK);
225 GOTO(err_exit, rc = -ENOMEM);
227 body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
228 body->lgd_logid = loghandle->lgh_id;
229 body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
230 body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
231 body->lgd_index = prev_idx;
234 req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_SERVER, len);
235 ptlrpc_request_set_replen(req);
237 rc = ptlrpc_queue_wait(req);
241 body = req_capsule_server_get(&req->rq_pill, &RMF_LLOGD_BODY);
243 GOTO(out, rc =-EFAULT);
245 ptr = req_capsule_server_get(&req->rq_pill, &RMF_EADATA);
247 GOTO(out, rc =-EFAULT);
249 memcpy(buf, ptr, len);
252 ptlrpc_req_finished(req);
254 LLOG_CLIENT_EXIT(loghandle->lgh_ctxt, imp);
258 static int llog_client_read_header(const struct lu_env *env,
259 struct llog_handle *handle)
261 struct obd_import *imp;
262 struct ptlrpc_request *req = NULL;
263 struct llogd_body *body;
264 struct llog_log_hdr *hdr;
265 struct llog_rec_hdr *llh_hdr;
269 LLOG_CLIENT_ENTRY(handle->lgh_ctxt, imp);
270 req = ptlrpc_request_alloc_pack(imp,&RQF_LLOG_ORIGIN_HANDLE_READ_HEADER,
272 LLOG_ORIGIN_HANDLE_READ_HEADER);
274 GOTO(err_exit, rc = -ENOMEM);
276 body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
277 body->lgd_logid = handle->lgh_id;
278 body->lgd_ctxt_idx = handle->lgh_ctxt->loc_idx - 1;
279 body->lgd_llh_flags = handle->lgh_hdr->llh_flags;
281 ptlrpc_request_set_replen(req);
282 rc = ptlrpc_queue_wait(req);
286 hdr = req_capsule_server_get(&req->rq_pill, &RMF_LLOG_LOG_HDR);
288 GOTO(out, rc =-EFAULT);
290 if (handle->lgh_hdr_size < hdr->llh_hdr.lrh_len)
291 GOTO(out, rc = -EFAULT);
293 memcpy(handle->lgh_hdr, hdr, hdr->llh_hdr.lrh_len);
294 handle->lgh_last_idx = LLOG_HDR_TAIL(handle->lgh_hdr)->lrt_index;
297 llh_hdr = &handle->lgh_hdr->llh_hdr;
298 if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
299 CERROR("bad log header magic: %#x (expecting %#x)\n",
300 llh_hdr->lrh_type, LLOG_HDR_MAGIC);
302 } else if (llh_hdr->lrh_len !=
303 LLOG_HDR_TAIL(handle->lgh_hdr)->lrt_len ||
304 (llh_hdr->lrh_len & (llh_hdr->lrh_len - 1)) != 0 ||
305 llh_hdr->lrh_len < LLOG_MIN_CHUNK_SIZE ||
306 llh_hdr->lrh_len > handle->lgh_hdr_size) {
307 CERROR("incorrectly sized log header: %#x, "
308 "expecting %#x (power of two > 8192)\n",
310 LLOG_HDR_TAIL(handle->lgh_hdr)->lrt_len);
311 CERROR("you may need to re-run lconf --write_conf.\n");
316 ptlrpc_req_finished(req);
318 LLOG_CLIENT_EXIT(handle->lgh_ctxt, imp);
322 static int llog_client_close(const struct lu_env *env,
323 struct llog_handle *handle)
325 /* this doesn't call LLOG_ORIGIN_HANDLE_CLOSE because
326 the servers all close the file at the end of every
331 struct llog_operations llog_client_ops = {
332 .lop_next_block = llog_client_next_block,
333 .lop_prev_block = llog_client_prev_block,
334 .lop_read_header = llog_client_read_header,
335 .lop_open = llog_client_open,
336 .lop_close = llog_client_close,
338 EXPORT_SYMBOL(llog_client_ops);