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6 * This program is free software; you can redistribute it and/or modify
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11 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/ptlrpc/llog_client.c
38 * remote api for llog - client side
40 * Author: Andreas Dilger <adilger@clusterfs.com>
43 #define DEBUG_SUBSYSTEM S_LOG
45 #include <linux/libcfs/libcfs.h>
47 #include <obd_class.h>
48 #include <lustre_log.h>
49 #include <lustre_net.h>
50 #include <linux/list.h>
52 #define LLOG_CLIENT_ENTRY(ctxt, imp) do { \
53 mutex_lock(&ctxt->loc_mutex); \
54 if (ctxt->loc_imp) { \
55 imp = class_import_get(ctxt->loc_imp); \
57 CERROR("ctxt->loc_imp == NULL for context idx %d." \
58 "Unable to complete MDS/OSS recovery," \
59 "but I'll try again next time. Not fatal.\n", \
62 mutex_unlock(&ctxt->loc_mutex); \
65 mutex_unlock(&ctxt->loc_mutex); \
68 #define LLOG_CLIENT_EXIT(ctxt, imp) do { \
69 mutex_lock(&ctxt->loc_mutex); \
70 if (ctxt->loc_imp != imp) \
71 CWARN("loc_imp has changed from %p to %p\n", \
72 ctxt->loc_imp, imp); \
73 class_import_put(imp); \
74 mutex_unlock(&ctxt->loc_mutex); \
77 /* This is a callback from the llog_* functions.
78 * Assumes caller has already pushed us into the kernel context. */
79 static int llog_client_open(const struct lu_env *env,
80 struct llog_handle *lgh, struct llog_logid *logid,
81 char *name, enum llog_open_param open_param)
83 struct obd_import *imp;
84 struct llogd_body *body;
85 struct llog_ctxt *ctxt = lgh->lgh_ctxt;
86 struct ptlrpc_request *req = NULL;
89 LLOG_CLIENT_ENTRY(ctxt, imp);
91 /* client cannot create llog */
92 LASSERTF(open_param != LLOG_OPEN_NEW, "%#x\n", open_param);
95 req = ptlrpc_request_alloc(imp, &RQF_LLOG_ORIGIN_HANDLE_CREATE);
97 GOTO(out, rc = -ENOMEM);
100 req_capsule_set_size(&req->rq_pill, &RMF_NAME, RCL_CLIENT,
103 rc = ptlrpc_request_pack(req, LUSTRE_LOG_VERSION,
104 LLOG_ORIGIN_HANDLE_CREATE);
106 ptlrpc_request_free(req);
110 ptlrpc_request_set_replen(req);
112 body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
114 body->lgd_logid = *logid;
115 body->lgd_ctxt_idx = ctxt->loc_idx - 1;
119 tmp = req_capsule_client_sized_get(&req->rq_pill, &RMF_NAME,
125 rc = ptlrpc_queue_wait(req);
129 body = req_capsule_server_get(&req->rq_pill, &RMF_LLOGD_BODY);
131 GOTO(out, rc = -EFAULT);
133 lgh->lgh_id = body->lgd_logid;
134 lgh->lgh_ctxt = ctxt;
136 LLOG_CLIENT_EXIT(ctxt, imp);
137 ptlrpc_req_finished(req);
141 static int llog_client_destroy(const struct lu_env *env,
142 struct llog_handle *loghandle)
144 struct obd_import *imp;
145 struct ptlrpc_request *req = NULL;
146 struct llogd_body *body;
149 LLOG_CLIENT_ENTRY(loghandle->lgh_ctxt, imp);
150 req = ptlrpc_request_alloc_pack(imp, &RQF_LLOG_ORIGIN_HANDLE_DESTROY,
152 LLOG_ORIGIN_HANDLE_DESTROY);
154 GOTO(err_exit, rc =-ENOMEM);
156 body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
157 body->lgd_logid = loghandle->lgh_id;
158 body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
160 if (!(body->lgd_llh_flags & LLOG_F_IS_PLAIN))
161 CERROR("%s: wrong llog flags %x\n", imp->imp_obd->obd_name,
162 body->lgd_llh_flags);
164 ptlrpc_request_set_replen(req);
165 rc = ptlrpc_queue_wait(req);
167 ptlrpc_req_finished(req);
169 LLOG_CLIENT_EXIT(loghandle->lgh_ctxt, imp);
174 static int llog_client_next_block(const struct lu_env *env,
175 struct llog_handle *loghandle,
176 int *cur_idx, int next_idx,
177 __u64 *cur_offset, void *buf, int len)
179 struct obd_import *imp;
180 struct ptlrpc_request *req = NULL;
181 struct llogd_body *body;
185 LLOG_CLIENT_ENTRY(loghandle->lgh_ctxt, imp);
186 req = ptlrpc_request_alloc_pack(imp, &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK,
188 LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
190 GOTO(err_exit, rc =-ENOMEM);
192 body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
193 body->lgd_logid = loghandle->lgh_id;
194 body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
195 body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
196 body->lgd_index = next_idx;
197 body->lgd_saved_index = *cur_idx;
199 body->lgd_cur_offset = *cur_offset;
201 req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_SERVER, len);
202 ptlrpc_request_set_replen(req);
203 rc = ptlrpc_queue_wait(req);
207 body = req_capsule_server_get(&req->rq_pill, &RMF_LLOGD_BODY);
209 GOTO(out, rc =-EFAULT);
211 /* The log records are swabbed as they are processed */
212 ptr = req_capsule_server_get(&req->rq_pill, &RMF_EADATA);
214 GOTO(out, rc =-EFAULT);
216 *cur_idx = body->lgd_saved_index;
217 *cur_offset = body->lgd_cur_offset;
219 memcpy(buf, ptr, len);
221 ptlrpc_req_finished(req);
223 LLOG_CLIENT_EXIT(loghandle->lgh_ctxt, imp);
227 static int llog_client_prev_block(const struct lu_env *env,
228 struct llog_handle *loghandle,
229 int prev_idx, void *buf, int len)
231 struct obd_import *imp;
232 struct ptlrpc_request *req = NULL;
233 struct llogd_body *body;
237 LLOG_CLIENT_ENTRY(loghandle->lgh_ctxt, imp);
238 req = ptlrpc_request_alloc_pack(imp, &RQF_LLOG_ORIGIN_HANDLE_PREV_BLOCK,
240 LLOG_ORIGIN_HANDLE_PREV_BLOCK);
242 GOTO(err_exit, rc = -ENOMEM);
244 body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
245 body->lgd_logid = loghandle->lgh_id;
246 body->lgd_ctxt_idx = loghandle->lgh_ctxt->loc_idx - 1;
247 body->lgd_llh_flags = loghandle->lgh_hdr->llh_flags;
248 body->lgd_index = prev_idx;
251 req_capsule_set_size(&req->rq_pill, &RMF_EADATA, RCL_SERVER, len);
252 ptlrpc_request_set_replen(req);
254 rc = ptlrpc_queue_wait(req);
258 body = req_capsule_server_get(&req->rq_pill, &RMF_LLOGD_BODY);
260 GOTO(out, rc =-EFAULT);
262 ptr = req_capsule_server_get(&req->rq_pill, &RMF_EADATA);
264 GOTO(out, rc =-EFAULT);
266 memcpy(buf, ptr, len);
268 ptlrpc_req_finished(req);
270 LLOG_CLIENT_EXIT(loghandle->lgh_ctxt, imp);
274 static int llog_client_read_header(const struct lu_env *env,
275 struct llog_handle *handle)
277 struct obd_import *imp;
278 struct ptlrpc_request *req = NULL;
279 struct llogd_body *body;
280 struct llog_log_hdr *hdr;
281 struct llog_rec_hdr *llh_hdr;
284 LLOG_CLIENT_ENTRY(handle->lgh_ctxt, imp);
285 req = ptlrpc_request_alloc_pack(imp,&RQF_LLOG_ORIGIN_HANDLE_READ_HEADER,
287 LLOG_ORIGIN_HANDLE_READ_HEADER);
289 GOTO(err_exit, rc = -ENOMEM);
291 body = req_capsule_client_get(&req->rq_pill, &RMF_LLOGD_BODY);
292 body->lgd_logid = handle->lgh_id;
293 body->lgd_ctxt_idx = handle->lgh_ctxt->loc_idx - 1;
294 body->lgd_llh_flags = handle->lgh_hdr->llh_flags;
296 ptlrpc_request_set_replen(req);
297 rc = ptlrpc_queue_wait(req);
301 hdr = req_capsule_server_get(&req->rq_pill, &RMF_LLOG_LOG_HDR);
303 GOTO(out, rc =-EFAULT);
305 memcpy(handle->lgh_hdr, hdr, sizeof(*hdr));
306 handle->lgh_last_idx = handle->lgh_hdr->llh_tail.lrt_index;
309 llh_hdr = &handle->lgh_hdr->llh_hdr;
310 if (llh_hdr->lrh_type != LLOG_HDR_MAGIC) {
311 CERROR("bad log header magic: %#x (expecting %#x)\n",
312 llh_hdr->lrh_type, LLOG_HDR_MAGIC);
314 } else if (llh_hdr->lrh_len != LLOG_CHUNK_SIZE) {
315 CERROR("incorrectly sized log header: %#x "
317 llh_hdr->lrh_len, LLOG_CHUNK_SIZE);
318 CERROR("you may need to re-run lconf --write_conf.\n");
322 ptlrpc_req_finished(req);
324 LLOG_CLIENT_EXIT(handle->lgh_ctxt, imp);
328 static int llog_client_close(const struct lu_env *env,
329 struct llog_handle *handle)
331 /* this doesn't call LLOG_ORIGIN_HANDLE_CLOSE because
332 the servers all close the file at the end of every
337 struct llog_operations llog_client_ops = {
338 .lop_next_block = llog_client_next_block,
339 .lop_prev_block = llog_client_prev_block,
340 .lop_read_header = llog_client_read_header,
341 .lop_open = llog_client_open,
342 .lop_destroy = llog_client_destroy,
343 .lop_close = llog_client_close,
345 EXPORT_SYMBOL(llog_client_ops);