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